Check in LLVM r95781.
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
new file mode 100644
index 0000000..fc08384
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -0,0 +1,1790 @@
+//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the AsmPrinter class.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "asm-printer"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Constants.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/DwarfWriter.h"
+#include "llvm/CodeGen/GCMetadataPrinter.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineJumpTableInfo.h"
+#include "llvm/CodeGen/MachineLoopInfo.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/Analysis/ConstantFolding.h"
+#include "llvm/Analysis/DebugInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/FormattedStream.h"
+#include <cerrno>
+using namespace llvm;
+
+STATISTIC(EmittedInsts, "Number of machine instrs printed");
+
+char AsmPrinter::ID = 0;
+AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
+ MCContext &Ctx, MCStreamer &Streamer,
+ const MCAsmInfo *T)
+ : MachineFunctionPass(&ID), O(o),
+ TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
+ OutContext(Ctx), OutStreamer(Streamer),
+ LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) {
+ DW = 0; MMI = 0;
+ VerboseAsm = Streamer.isVerboseAsm();
+}
+
+AsmPrinter::~AsmPrinter() {
+ for (gcp_iterator I = GCMetadataPrinters.begin(),
+ E = GCMetadataPrinters.end(); I != E; ++I)
+ delete I->second;
+
+ delete &OutStreamer;
+ delete &OutContext;
+}
+
+/// getFunctionNumber - Return a unique ID for the current function.
+///
+unsigned AsmPrinter::getFunctionNumber() const {
+ return MF->getFunctionNumber();
+}
+
+TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
+ return TM.getTargetLowering()->getObjFileLowering();
+}
+
+/// getCurrentSection() - Return the current section we are emitting to.
+const MCSection *AsmPrinter::getCurrentSection() const {
+ return OutStreamer.getCurrentSection();
+}
+
+
+void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ MachineFunctionPass::getAnalysisUsage(AU);
+ AU.addRequired<GCModuleInfo>();
+ if (VerboseAsm)
+ AU.addRequired<MachineLoopInfo>();
+}
+
+bool AsmPrinter::doInitialization(Module &M) {
+ // Initialize TargetLoweringObjectFile.
+ const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
+ .Initialize(OutContext, TM);
+
+ Mang = new Mangler(*MAI);
+
+ // Allow the target to emit any magic that it wants at the start of the file.
+ EmitStartOfAsmFile(M);
+
+ // Very minimal debug info. It is ignored if we emit actual debug info. If we
+ // don't, this at least helps the user find where a global came from.
+ if (MAI->hasSingleParameterDotFile()) {
+ // .file "foo.c"
+ OutStreamer.EmitFileDirective(M.getModuleIdentifier());
+ }
+
+ GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
+ assert(MI && "AsmPrinter didn't require GCModuleInfo?");
+ for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
+ if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
+ MP->beginAssembly(O, *this, *MAI);
+
+ if (!M.getModuleInlineAsm().empty())
+ O << MAI->getCommentString() << " Start of file scope inline assembly\n"
+ << M.getModuleInlineAsm()
+ << '\n' << MAI->getCommentString()
+ << " End of file scope inline assembly\n";
+
+ MMI = getAnalysisIfAvailable<MachineModuleInfo>();
+ if (MMI)
+ MMI->AnalyzeModule(M);
+ DW = getAnalysisIfAvailable<DwarfWriter>();
+ if (DW)
+ DW->BeginModule(&M, MMI, O, this, MAI);
+
+ return false;
+}
+
+void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
+ switch ((GlobalValue::LinkageTypes)Linkage) {
+ case GlobalValue::CommonLinkage:
+ case GlobalValue::LinkOnceAnyLinkage:
+ case GlobalValue::LinkOnceODRLinkage:
+ case GlobalValue::WeakAnyLinkage:
+ case GlobalValue::WeakODRLinkage:
+ case GlobalValue::LinkerPrivateLinkage:
+ if (MAI->getWeakDefDirective() != 0) {
+ // .globl _foo
+ OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
+ // .weak_definition _foo
+ OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
+ } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
+ // .globl _foo
+ OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
+ // FIXME: linkonce should be a section attribute, handled by COFF Section
+ // assignment.
+ // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
+ // .linkonce discard
+ // FIXME: It would be nice to use .linkonce samesize for non-common
+ // globals.
+ O << LinkOnce;
+ } else {
+ // .weak _foo
+ OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
+ }
+ break;
+ case GlobalValue::DLLExportLinkage:
+ case GlobalValue::AppendingLinkage:
+ // FIXME: appending linkage variables should go into a section of
+ // their name or something. For now, just emit them as external.
+ case GlobalValue::ExternalLinkage:
+ // If external or appending, declare as a global symbol.
+ // .globl _foo
+ OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
+ break;
+ case GlobalValue::PrivateLinkage:
+ case GlobalValue::InternalLinkage:
+ break;
+ default:
+ llvm_unreachable("Unknown linkage type!");
+ }
+}
+
+
+/// EmitGlobalVariable - Emit the specified global variable to the .s file.
+void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
+ if (!GV->hasInitializer()) // External globals require no code.
+ return;
+
+ // Check to see if this is a special global used by LLVM, if so, emit it.
+ if (EmitSpecialLLVMGlobal(GV))
+ return;
+
+ MCSymbol *GVSym = GetGlobalValueSymbol(GV);
+ EmitVisibility(GVSym, GV->getVisibility());
+
+ if (MAI->hasDotTypeDotSizeDirective())
+ OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
+
+ SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
+
+ const TargetData *TD = TM.getTargetData();
+ unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
+ unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
+
+ // Handle common and BSS local symbols (.lcomm).
+ if (GVKind.isCommon() || GVKind.isBSSLocal()) {
+ if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
+
+ if (VerboseAsm) {
+ WriteAsOperand(OutStreamer.GetCommentOS(), GV,
+ /*PrintType=*/false, GV->getParent());
+ OutStreamer.GetCommentOS() << '\n';
+ }
+
+ // Handle common symbols.
+ if (GVKind.isCommon()) {
+ // .comm _foo, 42, 4
+ OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
+ return;
+ }
+
+ // Handle local BSS symbols.
+ if (MAI->hasMachoZeroFillDirective()) {
+ const MCSection *TheSection =
+ getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
+ // .zerofill __DATA, __bss, _foo, 400, 5
+ OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
+ return;
+ }
+
+ if (MAI->hasLCOMMDirective()) {
+ // .lcomm _foo, 42
+ OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
+ return;
+ }
+
+ // .local _foo
+ OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
+ // .comm _foo, 42, 4
+ OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
+ return;
+ }
+
+ const MCSection *TheSection =
+ getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
+
+ // Handle the zerofill directive on darwin, which is a special form of BSS
+ // emission.
+ if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
+ // .globl _foo
+ OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
+ // .zerofill __DATA, __common, _foo, 400, 5
+ OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
+ return;
+ }
+
+ OutStreamer.SwitchSection(TheSection);
+
+ EmitLinkage(GV->getLinkage(), GVSym);
+ EmitAlignment(AlignLog, GV);
+
+ if (VerboseAsm) {
+ WriteAsOperand(OutStreamer.GetCommentOS(), GV,
+ /*PrintType=*/false, GV->getParent());
+ OutStreamer.GetCommentOS() << '\n';
+ }
+ OutStreamer.EmitLabel(GVSym);
+
+ EmitGlobalConstant(GV->getInitializer());
+
+ if (MAI->hasDotTypeDotSizeDirective())
+ // .size foo, 42
+ OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
+
+ OutStreamer.AddBlankLine();
+}
+
+/// EmitFunctionHeader - This method emits the header for the current
+/// function.
+void AsmPrinter::EmitFunctionHeader() {
+ // Print out constants referenced by the function
+ EmitConstantPool();
+
+ // Print the 'header' of function.
+ const Function *F = MF->getFunction();
+
+ OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
+ EmitVisibility(CurrentFnSym, F->getVisibility());
+
+ EmitLinkage(F->getLinkage(), CurrentFnSym);
+ EmitAlignment(MF->getAlignment(), F);
+
+ if (MAI->hasDotTypeDotSizeDirective())
+ OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
+
+ if (VerboseAsm) {
+ WriteAsOperand(OutStreamer.GetCommentOS(), F,
+ /*PrintType=*/false, F->getParent());
+ OutStreamer.GetCommentOS() << '\n';
+ }
+
+ // Emit the CurrentFnSym. This is a virtual function to allow targets to
+ // do their wild and crazy things as required.
+ EmitFunctionEntryLabel();
+
+ // Add some workaround for linkonce linkage on Cygwin\MinGW.
+ if (MAI->getLinkOnceDirective() != 0 &&
+ (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
+ // FIXME: What is this?
+ O << "Lllvm$workaround$fake$stub$" << *CurrentFnSym << ":\n";
+
+ // Emit pre-function debug and/or EH information.
+ if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
+ DW->BeginFunction(MF);
+}
+
+/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
+/// function. This can be overridden by targets as required to do custom stuff.
+void AsmPrinter::EmitFunctionEntryLabel() {
+ OutStreamer.EmitLabel(CurrentFnSym);
+}
+
+
+/// EmitComments - Pretty-print comments for instructions.
+static void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
+ const MachineFunction *MF = MI.getParent()->getParent();
+ const TargetMachine &TM = MF->getTarget();
+
+ if (!MI.getDebugLoc().isUnknown()) {
+ DILocation DLT = MF->getDILocation(MI.getDebugLoc());
+
+ // Print source line info.
+ DIScope Scope = DLT.getScope();
+ // Omit the directory, because it's likely to be long and uninteresting.
+ if (!Scope.isNull())
+ CommentOS << Scope.getFilename();
+ else
+ CommentOS << "<unknown>";
+ CommentOS << ':' << DLT.getLineNumber();
+ if (DLT.getColumnNumber() != 0)
+ CommentOS << ':' << DLT.getColumnNumber();
+ CommentOS << '\n';
+ }
+
+ // Check for spills and reloads
+ int FI;
+
+ const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
+
+ // We assume a single instruction only has a spill or reload, not
+ // both.
+ const MachineMemOperand *MMO;
+ if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
+ if (FrameInfo->isSpillSlotObjectIndex(FI)) {
+ MMO = *MI.memoperands_begin();
+ CommentOS << MMO->getSize() << "-byte Reload\n";
+ }
+ } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
+ if (FrameInfo->isSpillSlotObjectIndex(FI))
+ CommentOS << MMO->getSize() << "-byte Folded Reload\n";
+ } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
+ if (FrameInfo->isSpillSlotObjectIndex(FI)) {
+ MMO = *MI.memoperands_begin();
+ CommentOS << MMO->getSize() << "-byte Spill\n";
+ }
+ } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
+ if (FrameInfo->isSpillSlotObjectIndex(FI))
+ CommentOS << MMO->getSize() << "-byte Folded Spill\n";
+ }
+
+ // Check for spill-induced copies
+ unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
+ if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
+ SrcSubIdx, DstSubIdx)) {
+ if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
+ CommentOS << " Reload Reuse\n";
+ }
+}
+
+
+
+/// EmitFunctionBody - This method emits the body and trailer for a
+/// function.
+void AsmPrinter::EmitFunctionBody() {
+ // Emit target-specific gunk before the function body.
+ EmitFunctionBodyStart();
+
+ // Print out code for the function.
+ bool HasAnyRealCode = false;
+ for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
+ I != E; ++I) {
+ // Print a label for the basic block.
+ EmitBasicBlockStart(I);
+ for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
+ II != IE; ++II) {
+ // Print the assembly for the instruction.
+ if (!II->isLabel())
+ HasAnyRealCode = true;
+
+ ++EmittedInsts;
+
+ // FIXME: Clean up processDebugLoc.
+ processDebugLoc(II, true);
+
+ if (VerboseAsm)
+ EmitComments(*II, OutStreamer.GetCommentOS());
+
+ switch (II->getOpcode()) {
+ case TargetOpcode::DBG_LABEL:
+ case TargetOpcode::EH_LABEL:
+ case TargetOpcode::GC_LABEL:
+ printLabelInst(II);
+ break;
+ case TargetOpcode::INLINEASM:
+ printInlineAsm(II);
+ break;
+ case TargetOpcode::IMPLICIT_DEF:
+ printImplicitDef(II);
+ break;
+ case TargetOpcode::KILL:
+ printKill(II);
+ break;
+ default:
+ EmitInstruction(II);
+ break;
+ }
+
+ // FIXME: Clean up processDebugLoc.
+ processDebugLoc(II, false);
+ }
+ }
+
+ // If the function is empty and the object file uses .subsections_via_symbols,
+ // then we need to emit *something* to the function body to prevent the
+ // labels from collapsing together. Just emit a 0 byte.
+ if (MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode)
+ OutStreamer.EmitIntValue(0, 1, 0/*addrspace*/);
+
+ // Emit target-specific gunk after the function body.
+ EmitFunctionBodyEnd();
+
+ if (MAI->hasDotTypeDotSizeDirective())
+ O << "\t.size\t" << *CurrentFnSym << ", .-" << *CurrentFnSym << '\n';
+
+ // Emit post-function debug information.
+ if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
+ DW->EndFunction(MF);
+
+ // Print out jump tables referenced by the function.
+ EmitJumpTableInfo();
+
+ OutStreamer.AddBlankLine();
+}
+
+
+bool AsmPrinter::doFinalization(Module &M) {
+ // Emit global variables.
+ for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I)
+ EmitGlobalVariable(I);
+
+ // Emit final debug information.
+ if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
+ DW->EndModule();
+
+ // If the target wants to know about weak references, print them all.
+ if (MAI->getWeakRefDirective()) {
+ // FIXME: This is not lazy, it would be nice to only print weak references
+ // to stuff that is actually used. Note that doing so would require targets
+ // to notice uses in operands (due to constant exprs etc). This should
+ // happen with the MC stuff eventually.
+
+ // Print out module-level global variables here.
+ for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I) {
+ if (!I->hasExternalWeakLinkage()) continue;
+ OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
+ MCSA_WeakReference);
+ }
+
+ for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
+ if (!I->hasExternalWeakLinkage()) continue;
+ OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
+ MCSA_WeakReference);
+ }
+ }
+
+ if (MAI->hasSetDirective()) {
+ OutStreamer.AddBlankLine();
+ for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
+ I != E; ++I) {
+ MCSymbol *Name = GetGlobalValueSymbol(I);
+
+ const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
+ MCSymbol *Target = GetGlobalValueSymbol(GV);
+
+ if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
+ OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
+ else if (I->hasWeakLinkage())
+ OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
+ else
+ assert(I->hasLocalLinkage() && "Invalid alias linkage");
+
+ EmitVisibility(Name, I->getVisibility());
+
+ // Emit the directives as assignments aka .set:
+ OutStreamer.EmitAssignment(Name,
+ MCSymbolRefExpr::Create(Target, OutContext));
+ }
+ }
+
+ GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
+ assert(MI && "AsmPrinter didn't require GCModuleInfo?");
+ for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
+ if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
+ MP->finishAssembly(O, *this, *MAI);
+
+ // If we don't have any trampolines, then we don't require stack memory
+ // to be executable. Some targets have a directive to declare this.
+ Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
+ if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
+ if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
+ OutStreamer.SwitchSection(S);
+
+ // Allow the target to emit any magic that it wants at the end of the file,
+ // after everything else has gone out.
+ EmitEndOfAsmFile(M);
+
+ delete Mang; Mang = 0;
+ DW = 0; MMI = 0;
+
+ OutStreamer.Finish();
+ return false;
+}
+
+void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
+ this->MF = &MF;
+ // Get the function symbol.
+ CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
+
+ if (VerboseAsm)
+ LI = &getAnalysis<MachineLoopInfo>();
+}
+
+namespace {
+ // SectionCPs - Keep track the alignment, constpool entries per Section.
+ struct SectionCPs {
+ const MCSection *S;
+ unsigned Alignment;
+ SmallVector<unsigned, 4> CPEs;
+ SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
+ };
+}
+
+/// EmitConstantPool - Print to the current output stream assembly
+/// representations of the constants in the constant pool MCP. This is
+/// used to print out constants which have been "spilled to memory" by
+/// the code generator.
+///
+void AsmPrinter::EmitConstantPool() {
+ const MachineConstantPool *MCP = MF->getConstantPool();
+ const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
+ if (CP.empty()) return;
+
+ // Calculate sections for constant pool entries. We collect entries to go into
+ // the same section together to reduce amount of section switch statements.
+ SmallVector<SectionCPs, 4> CPSections;
+ for (unsigned i = 0, e = CP.size(); i != e; ++i) {
+ const MachineConstantPoolEntry &CPE = CP[i];
+ unsigned Align = CPE.getAlignment();
+
+ SectionKind Kind;
+ switch (CPE.getRelocationInfo()) {
+ default: llvm_unreachable("Unknown section kind");
+ case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
+ case 1:
+ Kind = SectionKind::getReadOnlyWithRelLocal();
+ break;
+ case 0:
+ switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
+ case 4: Kind = SectionKind::getMergeableConst4(); break;
+ case 8: Kind = SectionKind::getMergeableConst8(); break;
+ case 16: Kind = SectionKind::getMergeableConst16();break;
+ default: Kind = SectionKind::getMergeableConst(); break;
+ }
+ }
+
+ const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
+
+ // The number of sections are small, just do a linear search from the
+ // last section to the first.
+ bool Found = false;
+ unsigned SecIdx = CPSections.size();
+ while (SecIdx != 0) {
+ if (CPSections[--SecIdx].S == S) {
+ Found = true;
+ break;
+ }
+ }
+ if (!Found) {
+ SecIdx = CPSections.size();
+ CPSections.push_back(SectionCPs(S, Align));
+ }
+
+ if (Align > CPSections[SecIdx].Alignment)
+ CPSections[SecIdx].Alignment = Align;
+ CPSections[SecIdx].CPEs.push_back(i);
+ }
+
+ // Now print stuff into the calculated sections.
+ for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
+ OutStreamer.SwitchSection(CPSections[i].S);
+ EmitAlignment(Log2_32(CPSections[i].Alignment));
+
+ unsigned Offset = 0;
+ for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
+ unsigned CPI = CPSections[i].CPEs[j];
+ MachineConstantPoolEntry CPE = CP[CPI];
+
+ // Emit inter-object padding for alignment.
+ unsigned AlignMask = CPE.getAlignment() - 1;
+ unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
+ OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
+
+ const Type *Ty = CPE.getType();
+ Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
+
+ // Emit the label with a comment on it.
+ if (VerboseAsm) {
+ OutStreamer.GetCommentOS() << "constant pool ";
+ WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
+ MF->getFunction()->getParent());
+ OutStreamer.GetCommentOS() << '\n';
+ }
+ OutStreamer.EmitLabel(GetCPISymbol(CPI));
+
+ if (CPE.isMachineConstantPoolEntry())
+ EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
+ else
+ EmitGlobalConstant(CPE.Val.ConstVal);
+ }
+ }
+}
+
+/// EmitJumpTableInfo - Print assembly representations of the jump tables used
+/// by the current function to the current output stream.
+///
+void AsmPrinter::EmitJumpTableInfo() {
+ const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
+ if (MJTI == 0) return;
+ const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
+ if (JT.empty()) return;
+
+ // Pick the directive to use to print the jump table entries, and switch to
+ // the appropriate section.
+ const Function *F = MF->getFunction();
+ bool JTInDiffSection = false;
+ if (// In PIC mode, we need to emit the jump table to the same section as the
+ // function body itself, otherwise the label differences won't make sense.
+ // FIXME: Need a better predicate for this: what about custom entries?
+ MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
+ // We should also do if the section name is NULL or function is declared
+ // in discardable section
+ // FIXME: this isn't the right predicate, should be based on the MCSection
+ // for the function.
+ F->isWeakForLinker()) {
+ OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
+ } else {
+ // Otherwise, drop it in the readonly section.
+ const MCSection *ReadOnlySection =
+ getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
+ OutStreamer.SwitchSection(ReadOnlySection);
+ JTInDiffSection = true;
+ }
+
+ EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
+
+ for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
+ const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
+
+ // If this jump table was deleted, ignore it.
+ if (JTBBs.empty()) continue;
+
+ // For the EK_LabelDifference32 entry, if the target supports .set, emit a
+ // .set directive for each unique entry. This reduces the number of
+ // relocations the assembler will generate for the jump table.
+ if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
+ MAI->hasSetDirective()) {
+ SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
+ const TargetLowering *TLI = TM.getTargetLowering();
+ const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
+ for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
+ const MachineBasicBlock *MBB = JTBBs[ii];
+ if (!EmittedSets.insert(MBB)) continue;
+
+ // .set LJTSet, LBB32-base
+ const MCExpr *LHS =
+ MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
+ OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
+ MCBinaryExpr::CreateSub(LHS, Base, OutContext));
+ }
+ }
+
+ // On some targets (e.g. Darwin) we want to emit two consequtive labels
+ // before each jump table. The first label is never referenced, but tells
+ // the assembler and linker the extents of the jump table object. The
+ // second label is actually referenced by the code.
+ if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
+ // FIXME: This doesn't have to have any specific name, just any randomly
+ // named and numbered 'l' label would work. Simplify GetJTISymbol.
+ OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
+
+ OutStreamer.EmitLabel(GetJTISymbol(JTI));
+
+ for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
+ EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
+ }
+}
+
+/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
+/// current stream.
+void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
+ const MachineBasicBlock *MBB,
+ unsigned UID) const {
+ const MCExpr *Value = 0;
+ switch (MJTI->getEntryKind()) {
+ case MachineJumpTableInfo::EK_Custom32:
+ Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
+ OutContext);
+ break;
+ case MachineJumpTableInfo::EK_BlockAddress:
+ // EK_BlockAddress - Each entry is a plain address of block, e.g.:
+ // .word LBB123
+ Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
+ break;
+ case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
+ // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
+ // with a relocation as gp-relative, e.g.:
+ // .gprel32 LBB123
+ MCSymbol *MBBSym = MBB->getSymbol(OutContext);
+ OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
+ return;
+ }
+
+ case MachineJumpTableInfo::EK_LabelDifference32: {
+ // EK_LabelDifference32 - Each entry is the address of the block minus
+ // the address of the jump table. This is used for PIC jump tables where
+ // gprel32 is not supported. e.g.:
+ // .word LBB123 - LJTI1_2
+ // If the .set directive is supported, this is emitted as:
+ // .set L4_5_set_123, LBB123 - LJTI1_2
+ // .word L4_5_set_123
+
+ // If we have emitted set directives for the jump table entries, print
+ // them rather than the entries themselves. If we're emitting PIC, then
+ // emit the table entries as differences between two text section labels.
+ if (MAI->hasSetDirective()) {
+ // If we used .set, reference the .set's symbol.
+ Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
+ OutContext);
+ break;
+ }
+ // Otherwise, use the difference as the jump table entry.
+ Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
+ const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
+ Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
+ break;
+ }
+ }
+
+ assert(Value && "Unknown entry kind!");
+
+ unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
+ OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
+}
+
+
+/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
+/// special global used by LLVM. If so, emit it and return true, otherwise
+/// do nothing and return false.
+bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
+ if (GV->getName() == "llvm.used") {
+ if (MAI->hasNoDeadStrip()) // No need to emit this at all.
+ EmitLLVMUsedList(GV->getInitializer());
+ return true;
+ }
+
+ // Ignore debug and non-emitted data. This handles llvm.compiler.used.
+ if (GV->getSection() == "llvm.metadata" ||
+ GV->hasAvailableExternallyLinkage())
+ return true;
+
+ if (!GV->hasAppendingLinkage()) return false;
+
+ assert(GV->hasInitializer() && "Not a special LLVM global!");
+
+ const TargetData *TD = TM.getTargetData();
+ unsigned Align = Log2_32(TD->getPointerPrefAlignment());
+ if (GV->getName() == "llvm.global_ctors") {
+ OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
+ EmitAlignment(Align, 0);
+ EmitXXStructorList(GV->getInitializer());
+
+ if (TM.getRelocationModel() == Reloc::Static &&
+ MAI->hasStaticCtorDtorReferenceInStaticMode()) {
+ StringRef Sym(".constructors_used");
+ OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
+ MCSA_Reference);
+ }
+ return true;
+ }
+
+ if (GV->getName() == "llvm.global_dtors") {
+ OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
+ EmitAlignment(Align, 0);
+ EmitXXStructorList(GV->getInitializer());
+
+ if (TM.getRelocationModel() == Reloc::Static &&
+ MAI->hasStaticCtorDtorReferenceInStaticMode()) {
+ StringRef Sym(".destructors_used");
+ OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
+ MCSA_Reference);
+ }
+ return true;
+ }
+
+ return false;
+}
+
+/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
+/// global in the specified llvm.used list for which emitUsedDirectiveFor
+/// is true, as being used with this directive.
+void AsmPrinter::EmitLLVMUsedList(Constant *List) {
+ // Should be an array of 'i8*'.
+ ConstantArray *InitList = dyn_cast<ConstantArray>(List);
+ if (InitList == 0) return;
+
+ for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
+ const GlobalValue *GV =
+ dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
+ if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
+ OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
+ MCSA_NoDeadStrip);
+ }
+}
+
+/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
+/// function pointers, ignoring the init priority.
+void AsmPrinter::EmitXXStructorList(Constant *List) {
+ // Should be an array of '{ int, void ()* }' structs. The first value is the
+ // init priority, which we ignore.
+ if (!isa<ConstantArray>(List)) return;
+ ConstantArray *InitList = cast<ConstantArray>(List);
+ for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
+ if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
+ if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
+
+ if (CS->getOperand(1)->isNullValue())
+ return; // Found a null terminator, exit printing.
+ // Emit the function pointer.
+ EmitGlobalConstant(CS->getOperand(1));
+ }
+}
+
+//===--------------------------------------------------------------------===//
+// Emission and print routines
+//
+
+/// EmitInt8 - Emit a byte directive and value.
+///
+void AsmPrinter::EmitInt8(int Value) const {
+ OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
+}
+
+/// EmitInt16 - Emit a short directive and value.
+///
+void AsmPrinter::EmitInt16(int Value) const {
+ OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
+}
+
+/// EmitInt32 - Emit a long directive and value.
+///
+void AsmPrinter::EmitInt32(int Value) const {
+ OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
+}
+
+/// EmitInt64 - Emit a long long directive and value.
+///
+void AsmPrinter::EmitInt64(uint64_t Value) const {
+ OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
+}
+
+//===----------------------------------------------------------------------===//
+
+// EmitAlignment - Emit an alignment directive to the specified power of
+// two boundary. For example, if you pass in 3 here, you will get an 8
+// byte alignment. If a global value is specified, and if that global has
+// an explicit alignment requested, it will unconditionally override the
+// alignment request. However, if ForcedAlignBits is specified, this value
+// has final say: the ultimate alignment will be the max of ForcedAlignBits
+// and the alignment computed with NumBits and the global.
+//
+// The algorithm is:
+// Align = NumBits;
+// if (GV && GV->hasalignment) Align = GV->getalignment();
+// Align = std::max(Align, ForcedAlignBits);
+//
+void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
+ unsigned ForcedAlignBits,
+ bool UseFillExpr) const {
+ if (GV && GV->getAlignment())
+ NumBits = Log2_32(GV->getAlignment());
+ NumBits = std::max(NumBits, ForcedAlignBits);
+
+ if (NumBits == 0) return; // No need to emit alignment.
+
+ unsigned FillValue = 0;
+ if (getCurrentSection()->getKind().isText())
+ FillValue = MAI->getTextAlignFillValue();
+
+ OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
+}
+
+/// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
+///
+static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
+ MCContext &Ctx = AP.OutContext;
+
+ if (CV->isNullValue() || isa<UndefValue>(CV))
+ return MCConstantExpr::Create(0, Ctx);
+
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
+ return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
+
+ if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
+ return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
+ if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
+ return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
+
+ const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
+ if (CE == 0) {
+ llvm_unreachable("Unknown constant value to lower!");
+ return MCConstantExpr::Create(0, Ctx);
+ }
+
+ switch (CE->getOpcode()) {
+ default:
+ // If the code isn't optimized, there may be outstanding folding
+ // opportunities. Attempt to fold the expression using TargetData as a
+ // last resort before giving up.
+ if (Constant *C =
+ ConstantFoldConstantExpression(CE, AP.TM.getTargetData()))
+ if (C != CE)
+ return LowerConstant(C, AP);
+#ifndef NDEBUG
+ CE->dump();
+#endif
+ llvm_unreachable("FIXME: Don't support this constant expr");
+ case Instruction::GetElementPtr: {
+ const TargetData &TD = *AP.TM.getTargetData();
+ // Generate a symbolic expression for the byte address
+ const Constant *PtrVal = CE->getOperand(0);
+ SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
+ int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
+ IdxVec.size());
+
+ const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
+ if (Offset == 0)
+ return Base;
+
+ // Truncate/sext the offset to the pointer size.
+ if (TD.getPointerSizeInBits() != 64) {
+ int SExtAmount = 64-TD.getPointerSizeInBits();
+ Offset = (Offset << SExtAmount) >> SExtAmount;
+ }
+
+ return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
+ Ctx);
+ }
+
+ case Instruction::Trunc:
+ // We emit the value and depend on the assembler to truncate the generated
+ // expression properly. This is important for differences between
+ // blockaddress labels. Since the two labels are in the same function, it
+ // is reasonable to treat their delta as a 32-bit value.
+ // FALL THROUGH.
+ case Instruction::BitCast:
+ return LowerConstant(CE->getOperand(0), AP);
+
+ case Instruction::IntToPtr: {
+ const TargetData &TD = *AP.TM.getTargetData();
+ // Handle casts to pointers by changing them into casts to the appropriate
+ // integer type. This promotes constant folding and simplifies this code.
+ Constant *Op = CE->getOperand(0);
+ Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
+ false/*ZExt*/);
+ return LowerConstant(Op, AP);
+ }
+
+ case Instruction::PtrToInt: {
+ const TargetData &TD = *AP.TM.getTargetData();
+ // Support only foldable casts to/from pointers that can be eliminated by
+ // changing the pointer to the appropriately sized integer type.
+ Constant *Op = CE->getOperand(0);
+ const Type *Ty = CE->getType();
+
+ const MCExpr *OpExpr = LowerConstant(Op, AP);
+
+ // We can emit the pointer value into this slot if the slot is an
+ // integer slot equal to the size of the pointer.
+ if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
+ return OpExpr;
+
+ // Otherwise the pointer is smaller than the resultant integer, mask off
+ // the high bits so we are sure to get a proper truncation if the input is
+ // a constant expr.
+ unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
+ const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
+ return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
+ }
+
+ // The MC library also has a right-shift operator, but it isn't consistently
+ // signed or unsigned between different targets.
+ case Instruction::Add:
+ case Instruction::Sub:
+ case Instruction::Mul:
+ case Instruction::SDiv:
+ case Instruction::SRem:
+ case Instruction::Shl:
+ case Instruction::And:
+ case Instruction::Or:
+ case Instruction::Xor: {
+ const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
+ const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
+ switch (CE->getOpcode()) {
+ default: llvm_unreachable("Unknown binary operator constant cast expr");
+ case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
+ case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
+ case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
+ case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
+ case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
+ case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
+ case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
+ case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
+ case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
+ }
+ }
+ }
+}
+
+static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
+ AsmPrinter &AP) {
+ if (AddrSpace != 0 || !CA->isString()) {
+ // Not a string. Print the values in successive locations
+ for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
+ AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
+ return;
+ }
+
+ // Otherwise, it can be emitted as .ascii.
+ SmallVector<char, 128> TmpVec;
+ TmpVec.reserve(CA->getNumOperands());
+ for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
+ TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
+
+ AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
+}
+
+static void EmitGlobalConstantVector(const ConstantVector *CV,
+ unsigned AddrSpace, AsmPrinter &AP) {
+ for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
+ AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
+}
+
+static void EmitGlobalConstantStruct(const ConstantStruct *CS,
+ unsigned AddrSpace, AsmPrinter &AP) {
+ // Print the fields in successive locations. Pad to align if needed!
+ const TargetData *TD = AP.TM.getTargetData();
+ unsigned Size = TD->getTypeAllocSize(CS->getType());
+ const StructLayout *Layout = TD->getStructLayout(CS->getType());
+ uint64_t SizeSoFar = 0;
+ for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
+ const Constant *Field = CS->getOperand(i);
+
+ // Check if padding is needed and insert one or more 0s.
+ uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
+ uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
+ - Layout->getElementOffset(i)) - FieldSize;
+ SizeSoFar += FieldSize + PadSize;
+
+ // Now print the actual field value.
+ AP.EmitGlobalConstant(Field, AddrSpace);
+
+ // Insert padding - this may include padding to increase the size of the
+ // current field up to the ABI size (if the struct is not packed) as well
+ // as padding to ensure that the next field starts at the right offset.
+ AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
+ }
+ assert(SizeSoFar == Layout->getSizeInBytes() &&
+ "Layout of constant struct may be incorrect!");
+}
+
+static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
+ AsmPrinter &AP) {
+ // FP Constants are printed as integer constants to avoid losing
+ // precision.
+ if (CFP->getType()->isDoubleTy()) {
+ if (AP.VerboseAsm) {
+ double Val = CFP->getValueAPF().convertToDouble();
+ AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
+ }
+
+ uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
+ AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
+ return;
+ }
+
+ if (CFP->getType()->isFloatTy()) {
+ if (AP.VerboseAsm) {
+ float Val = CFP->getValueAPF().convertToFloat();
+ AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
+ }
+ uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
+ AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
+ return;
+ }
+
+ if (CFP->getType()->isX86_FP80Ty()) {
+ // all long double variants are printed as hex
+ // api needed to prevent premature destruction
+ APInt API = CFP->getValueAPF().bitcastToAPInt();
+ const uint64_t *p = API.getRawData();
+ if (AP.VerboseAsm) {
+ // Convert to double so we can print the approximate val as a comment.
+ APFloat DoubleVal = CFP->getValueAPF();
+ bool ignored;
+ DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
+ &ignored);
+ AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
+ << DoubleVal.convertToDouble() << '\n';
+ }
+
+ if (AP.TM.getTargetData()->isBigEndian()) {
+ AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
+ AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
+ } else {
+ AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
+ AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
+ }
+
+ // Emit the tail padding for the long double.
+ const TargetData &TD = *AP.TM.getTargetData();
+ AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
+ TD.getTypeStoreSize(CFP->getType()), AddrSpace);
+ return;
+ }
+
+ assert(CFP->getType()->isPPC_FP128Ty() &&
+ "Floating point constant type not handled");
+ // All long double variants are printed as hex api needed to prevent
+ // premature destruction.
+ APInt API = CFP->getValueAPF().bitcastToAPInt();
+ const uint64_t *p = API.getRawData();
+ if (AP.TM.getTargetData()->isBigEndian()) {
+ AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
+ AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
+ } else {
+ AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
+ AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
+ }
+}
+
+static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
+ unsigned AddrSpace, AsmPrinter &AP) {
+ const TargetData *TD = AP.TM.getTargetData();
+ unsigned BitWidth = CI->getBitWidth();
+ assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
+
+ // We don't expect assemblers to support integer data directives
+ // for more than 64 bits, so we emit the data in at most 64-bit
+ // quantities at a time.
+ const uint64_t *RawData = CI->getValue().getRawData();
+ for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
+ uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
+ AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
+ }
+}
+
+/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
+void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
+ if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
+ uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
+ if (Size == 0) Size = 1; // An empty "_foo:" followed by a section is undef.
+ return OutStreamer.EmitZeros(Size, AddrSpace);
+ }
+
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
+ unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
+ switch (Size) {
+ case 1:
+ case 2:
+ case 4:
+ case 8:
+ if (VerboseAsm)
+ OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
+ OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
+ return;
+ default:
+ EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
+ return;
+ }
+ }
+
+ if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
+ return EmitGlobalConstantArray(CVA, AddrSpace, *this);
+
+ if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
+ return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
+
+ if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
+ return EmitGlobalConstantFP(CFP, AddrSpace, *this);
+
+ if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
+ return EmitGlobalConstantVector(V, AddrSpace, *this);
+
+ if (isa<ConstantPointerNull>(CV)) {
+ unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
+ OutStreamer.EmitIntValue(0, Size, AddrSpace);
+ return;
+ }
+
+ // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
+ // thread the streamer with EmitValue.
+ OutStreamer.EmitValue(LowerConstant(CV, *this),
+ TM.getTargetData()->getTypeAllocSize(CV->getType()),
+ AddrSpace);
+}
+
+void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
+ // Target doesn't support this yet!
+ llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
+}
+
+/// PrintSpecial - Print information related to the specified machine instr
+/// that is independent of the operand, and may be independent of the instr
+/// itself. This can be useful for portably encoding the comment character
+/// or other bits of target-specific knowledge into the asmstrings. The
+/// syntax used is ${:comment}. Targets can override this to add support
+/// for their own strange codes.
+void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
+ if (!strcmp(Code, "private")) {
+ O << MAI->getPrivateGlobalPrefix();
+ } else if (!strcmp(Code, "comment")) {
+ if (VerboseAsm)
+ O << MAI->getCommentString();
+ } else if (!strcmp(Code, "uid")) {
+ // Comparing the address of MI isn't sufficient, because machineinstrs may
+ // be allocated to the same address across functions.
+ const Function *ThisF = MI->getParent()->getParent()->getFunction();
+
+ // If this is a new LastFn instruction, bump the counter.
+ if (LastMI != MI || LastFn != ThisF) {
+ ++Counter;
+ LastMI = MI;
+ LastFn = ThisF;
+ }
+ O << Counter;
+ } else {
+ std::string msg;
+ raw_string_ostream Msg(msg);
+ Msg << "Unknown special formatter '" << Code
+ << "' for machine instr: " << *MI;
+ llvm_report_error(Msg.str());
+ }
+}
+
+/// processDebugLoc - Processes the debug information of each machine
+/// instruction's DebugLoc.
+void AsmPrinter::processDebugLoc(const MachineInstr *MI,
+ bool BeforePrintingInsn) {
+ if (!MAI || !DW || !MAI->doesSupportDebugInformation()
+ || !DW->ShouldEmitDwarfDebug())
+ return;
+ DebugLoc DL = MI->getDebugLoc();
+ if (DL.isUnknown())
+ return;
+ DILocation CurDLT = MF->getDILocation(DL);
+ if (CurDLT.getScope().isNull())
+ return;
+
+ if (!BeforePrintingInsn) {
+ // After printing instruction
+ DW->EndScope(MI);
+ } else if (CurDLT.getNode() != PrevDLT) {
+ unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
+ CurDLT.getColumnNumber(),
+ CurDLT.getScope().getNode());
+ printLabel(L);
+ O << '\n';
+ DW->BeginScope(MI, L);
+ PrevDLT = CurDLT.getNode();
+ }
+}
+
+
+/// printInlineAsm - This method formats and prints the specified machine
+/// instruction that is an inline asm.
+void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
+ unsigned NumOperands = MI->getNumOperands();
+
+ // Count the number of register definitions.
+ unsigned NumDefs = 0;
+ for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
+ ++NumDefs)
+ assert(NumDefs != NumOperands-1 && "No asm string?");
+
+ assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
+
+ // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
+ const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
+
+ O << '\t';
+
+ // If this asmstr is empty, just print the #APP/#NOAPP markers.
+ // These are useful to see where empty asm's wound up.
+ if (AsmStr[0] == 0) {
+ O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
+ O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
+ return;
+ }
+
+ O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
+
+ // The variant of the current asmprinter.
+ int AsmPrinterVariant = MAI->getAssemblerDialect();
+
+ int CurVariant = -1; // The number of the {.|.|.} region we are in.
+ const char *LastEmitted = AsmStr; // One past the last character emitted.
+
+ while (*LastEmitted) {
+ switch (*LastEmitted) {
+ default: {
+ // Not a special case, emit the string section literally.
+ const char *LiteralEnd = LastEmitted+1;
+ while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
+ *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
+ ++LiteralEnd;
+ if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
+ O.write(LastEmitted, LiteralEnd-LastEmitted);
+ LastEmitted = LiteralEnd;
+ break;
+ }
+ case '\n':
+ ++LastEmitted; // Consume newline character.
+ O << '\n'; // Indent code with newline.
+ break;
+ case '$': {
+ ++LastEmitted; // Consume '$' character.
+ bool Done = true;
+
+ // Handle escapes.
+ switch (*LastEmitted) {
+ default: Done = false; break;
+ case '$': // $$ -> $
+ if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
+ O << '$';
+ ++LastEmitted; // Consume second '$' character.
+ break;
+ case '(': // $( -> same as GCC's { character.
+ ++LastEmitted; // Consume '(' character.
+ if (CurVariant != -1) {
+ llvm_report_error("Nested variants found in inline asm string: '"
+ + std::string(AsmStr) + "'");
+ }
+ CurVariant = 0; // We're in the first variant now.
+ break;
+ case '|':
+ ++LastEmitted; // consume '|' character.
+ if (CurVariant == -1)
+ O << '|'; // this is gcc's behavior for | outside a variant
+ else
+ ++CurVariant; // We're in the next variant.
+ break;
+ case ')': // $) -> same as GCC's } char.
+ ++LastEmitted; // consume ')' character.
+ if (CurVariant == -1)
+ O << '}'; // this is gcc's behavior for } outside a variant
+ else
+ CurVariant = -1;
+ break;
+ }
+ if (Done) break;
+
+ bool HasCurlyBraces = false;
+ if (*LastEmitted == '{') { // ${variable}
+ ++LastEmitted; // Consume '{' character.
+ HasCurlyBraces = true;
+ }
+
+ // If we have ${:foo}, then this is not a real operand reference, it is a
+ // "magic" string reference, just like in .td files. Arrange to call
+ // PrintSpecial.
+ if (HasCurlyBraces && *LastEmitted == ':') {
+ ++LastEmitted;
+ const char *StrStart = LastEmitted;
+ const char *StrEnd = strchr(StrStart, '}');
+ if (StrEnd == 0) {
+ llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
+ + std::string(AsmStr) + "'");
+ }
+
+ std::string Val(StrStart, StrEnd);
+ PrintSpecial(MI, Val.c_str());
+ LastEmitted = StrEnd+1;
+ break;
+ }
+
+ const char *IDStart = LastEmitted;
+ char *IDEnd;
+ errno = 0;
+ long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
+ if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
+ llvm_report_error("Bad $ operand number in inline asm string: '"
+ + std::string(AsmStr) + "'");
+ }
+ LastEmitted = IDEnd;
+
+ char Modifier[2] = { 0, 0 };
+
+ if (HasCurlyBraces) {
+ // If we have curly braces, check for a modifier character. This
+ // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
+ if (*LastEmitted == ':') {
+ ++LastEmitted; // Consume ':' character.
+ if (*LastEmitted == 0) {
+ llvm_report_error("Bad ${:} expression in inline asm string: '"
+ + std::string(AsmStr) + "'");
+ }
+
+ Modifier[0] = *LastEmitted;
+ ++LastEmitted; // Consume modifier character.
+ }
+
+ if (*LastEmitted != '}') {
+ llvm_report_error("Bad ${} expression in inline asm string: '"
+ + std::string(AsmStr) + "'");
+ }
+ ++LastEmitted; // Consume '}' character.
+ }
+
+ if ((unsigned)Val >= NumOperands-1) {
+ llvm_report_error("Invalid $ operand number in inline asm string: '"
+ + std::string(AsmStr) + "'");
+ }
+
+ // Okay, we finally have a value number. Ask the target to print this
+ // operand!
+ if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
+ unsigned OpNo = 1;
+
+ bool Error = false;
+
+ // Scan to find the machine operand number for the operand.
+ for (; Val; --Val) {
+ if (OpNo >= MI->getNumOperands()) break;
+ unsigned OpFlags = MI->getOperand(OpNo).getImm();
+ OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
+ }
+
+ if (OpNo >= MI->getNumOperands()) {
+ Error = true;
+ } else {
+ unsigned OpFlags = MI->getOperand(OpNo).getImm();
+ ++OpNo; // Skip over the ID number.
+
+ if (Modifier[0] == 'l') // labels are target independent
+ O << *MI->getOperand(OpNo).getMBB()->getSymbol(OutContext);
+ else {
+ AsmPrinter *AP = const_cast<AsmPrinter*>(this);
+ if ((OpFlags & 7) == 4) {
+ Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
+ Modifier[0] ? Modifier : 0);
+ } else {
+ Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
+ Modifier[0] ? Modifier : 0);
+ }
+ }
+ }
+ if (Error) {
+ std::string msg;
+ raw_string_ostream Msg(msg);
+ Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
+ MI->print(Msg);
+ llvm_report_error(Msg.str());
+ }
+ }
+ break;
+ }
+ }
+ }
+ O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
+ OutStreamer.AddBlankLine();
+}
+
+/// printImplicitDef - This method prints the specified machine instruction
+/// that is an implicit def.
+void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
+ if (!VerboseAsm) return;
+ O.PadToColumn(MAI->getCommentColumn());
+ O << MAI->getCommentString() << " implicit-def: "
+ << TRI->getName(MI->getOperand(0).getReg());
+ OutStreamer.AddBlankLine();
+}
+
+void AsmPrinter::printKill(const MachineInstr *MI) const {
+ if (!VerboseAsm) return;
+ O.PadToColumn(MAI->getCommentColumn());
+ O << MAI->getCommentString() << " kill:";
+ for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
+ const MachineOperand &op = MI->getOperand(n);
+ assert(op.isReg() && "KILL instruction must have only register operands");
+ O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
+ }
+ OutStreamer.AddBlankLine();
+}
+
+/// printLabel - This method prints a local label used by debug and
+/// exception handling tables.
+void AsmPrinter::printLabelInst(const MachineInstr *MI) const {
+ printLabel(MI->getOperand(0).getImm());
+ OutStreamer.AddBlankLine();
+}
+
+void AsmPrinter::printLabel(unsigned Id) const {
+ O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
+}
+
+/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
+/// instruction, using the specified assembler variant. Targets should
+/// override this to format as appropriate.
+bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+ unsigned AsmVariant, const char *ExtraCode) {
+ // Target doesn't support this yet!
+ return true;
+}
+
+bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
+ unsigned AsmVariant,
+ const char *ExtraCode) {
+ // Target doesn't support this yet!
+ return true;
+}
+
+MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
+ return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock());
+}
+
+MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
+ const BasicBlock *BB) const {
+ assert(BB->hasName() &&
+ "Address of anonymous basic block not supported yet!");
+
+ // This code must use the function name itself, and not the function number,
+ // since it must be possible to generate the label name from within other
+ // functions.
+ SmallString<60> FnName;
+ Mang->getNameWithPrefix(FnName, F, false);
+
+ // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
+ SmallString<60> NameResult;
+ Mang->getNameWithPrefix(NameResult,
+ StringRef("BA") + Twine((unsigned)FnName.size()) +
+ "_" + FnName.str() + "_" + BB->getName(),
+ Mangler::Private);
+
+ return OutContext.GetOrCreateSymbol(NameResult.str());
+}
+
+/// GetCPISymbol - Return the symbol for the specified constant pool entry.
+MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
+ SmallString<60> Name;
+ raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
+ << getFunctionNumber() << '_' << CPID;
+ return OutContext.GetOrCreateSymbol(Name.str());
+}
+
+/// GetJTISymbol - Return the symbol for the specified jump table entry.
+MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
+ return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
+}
+
+/// GetJTSetSymbol - Return the symbol for the specified jump table .set
+/// FIXME: privatize to AsmPrinter.
+MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
+ SmallString<60> Name;
+ raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
+ << getFunctionNumber() << '_' << UID << "_set_" << MBBID;
+ return OutContext.GetOrCreateSymbol(Name.str());
+}
+
+/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
+/// value.
+MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
+ SmallString<60> NameStr;
+ Mang->getNameWithPrefix(NameStr, GV, false);
+ return OutContext.GetOrCreateSymbol(NameStr.str());
+}
+
+/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
+/// global value name as its base, with the specified suffix, and where the
+/// symbol is forced to have private linkage if ForcePrivate is true.
+MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
+ StringRef Suffix,
+ bool ForcePrivate) const {
+ SmallString<60> NameStr;
+ Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
+ NameStr.append(Suffix.begin(), Suffix.end());
+ return OutContext.GetOrCreateSymbol(NameStr.str());
+}
+
+/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
+/// ExternalSymbol.
+MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
+ SmallString<60> NameStr;
+ Mang->getNameWithPrefix(NameStr, Sym);
+ return OutContext.GetOrCreateSymbol(NameStr.str());
+}
+
+
+
+/// PrintParentLoopComment - Print comments about parent loops of this one.
+static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
+ unsigned FunctionNumber) {
+ if (Loop == 0) return;
+ PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
+ OS.indent(Loop->getLoopDepth()*2)
+ << "Parent Loop BB" << FunctionNumber << "_"
+ << Loop->getHeader()->getNumber()
+ << " Depth=" << Loop->getLoopDepth() << '\n';
+}
+
+
+/// PrintChildLoopComment - Print comments about child loops within
+/// the loop for this basic block, with nesting.
+static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
+ unsigned FunctionNumber) {
+ // Add child loop information
+ for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
+ OS.indent((*CL)->getLoopDepth()*2)
+ << "Child Loop BB" << FunctionNumber << "_"
+ << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
+ << '\n';
+ PrintChildLoopComment(OS, *CL, FunctionNumber);
+ }
+}
+
+/// PrintBasicBlockLoopComments - Pretty-print comments for basic blocks.
+static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
+ const MachineLoopInfo *LI,
+ const AsmPrinter &AP) {
+ // Add loop depth information
+ const MachineLoop *Loop = LI->getLoopFor(&MBB);
+ if (Loop == 0) return;
+
+ MachineBasicBlock *Header = Loop->getHeader();
+ assert(Header && "No header for loop");
+
+ // If this block is not a loop header, just print out what is the loop header
+ // and return.
+ if (Header != &MBB) {
+ AP.OutStreamer.AddComment(" in Loop: Header=BB" +
+ Twine(AP.getFunctionNumber())+"_" +
+ Twine(Loop->getHeader()->getNumber())+
+ " Depth="+Twine(Loop->getLoopDepth()));
+ return;
+ }
+
+ // Otherwise, it is a loop header. Print out information about child and
+ // parent loops.
+ raw_ostream &OS = AP.OutStreamer.GetCommentOS();
+
+ PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
+
+ OS << "=>";
+ OS.indent(Loop->getLoopDepth()*2-2);
+
+ OS << "This ";
+ if (Loop->empty())
+ OS << "Inner ";
+ OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
+
+ PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
+}
+
+
+/// EmitBasicBlockStart - This method prints the label for the specified
+/// MachineBasicBlock, an alignment (if present) and a comment describing
+/// it if appropriate.
+void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
+ // Emit an alignment directive for this block, if needed.
+ if (unsigned Align = MBB->getAlignment())
+ EmitAlignment(Log2_32(Align));
+
+ // If the block has its address taken, emit a special label to satisfy
+ // references to the block. This is done so that we don't need to
+ // remember the number of this label, and so that we can make
+ // forward references to labels without knowing what their numbers
+ // will be.
+ if (MBB->hasAddressTaken()) {
+ const BasicBlock *BB = MBB->getBasicBlock();
+ if (VerboseAsm)
+ OutStreamer.AddComment("Address Taken");
+ OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
+ }
+
+ // Print the main label for the block.
+ if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
+ if (VerboseAsm) {
+ // NOTE: Want this comment at start of line.
+ O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
+ if (const BasicBlock *BB = MBB->getBasicBlock())
+ if (BB->hasName())
+ OutStreamer.AddComment("%" + BB->getName());
+
+ PrintBasicBlockLoopComments(*MBB, LI, *this);
+ OutStreamer.AddBlankLine();
+ }
+ } else {
+ if (VerboseAsm) {
+ if (const BasicBlock *BB = MBB->getBasicBlock())
+ if (BB->hasName())
+ OutStreamer.AddComment("%" + BB->getName());
+ PrintBasicBlockLoopComments(*MBB, LI, *this);
+ }
+
+ OutStreamer.EmitLabel(MBB->getSymbol(OutContext));
+ }
+}
+
+void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility) const {
+ MCSymbolAttr Attr = MCSA_Invalid;
+
+ switch (Visibility) {
+ default: break;
+ case GlobalValue::HiddenVisibility:
+ Attr = MAI->getHiddenVisibilityAttr();
+ break;
+ case GlobalValue::ProtectedVisibility:
+ Attr = MAI->getProtectedVisibilityAttr();
+ break;
+ }
+
+ if (Attr != MCSA_Invalid)
+ OutStreamer.EmitSymbolAttribute(Sym, Attr);
+}
+
+void AsmPrinter::printOffset(int64_t Offset) const {
+ if (Offset > 0)
+ O << '+' << Offset;
+ else if (Offset < 0)
+ O << Offset;
+}
+
+GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
+ if (!S->usesMetadata())
+ return 0;
+
+ gcp_iterator GCPI = GCMetadataPrinters.find(S);
+ if (GCPI != GCMetadataPrinters.end())
+ return GCPI->second;
+
+ const char *Name = S->getName().c_str();
+
+ for (GCMetadataPrinterRegistry::iterator
+ I = GCMetadataPrinterRegistry::begin(),
+ E = GCMetadataPrinterRegistry::end(); I != E; ++I)
+ if (strcmp(Name, I->getName()) == 0) {
+ GCMetadataPrinter *GMP = I->instantiate();
+ GMP->S = S;
+ GCMetadataPrinters.insert(std::make_pair(S, GMP));
+ return GMP;
+ }
+
+ llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
+ return 0;
+}
+
diff --git a/lib/CodeGen/AsmPrinter/CMakeLists.txt b/lib/CodeGen/AsmPrinter/CMakeLists.txt
new file mode 100644
index 0000000..066aaab
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/CMakeLists.txt
@@ -0,0 +1,10 @@
+add_llvm_library(LLVMAsmPrinter
+ AsmPrinter.cpp
+ DIE.cpp
+ DwarfDebug.cpp
+ DwarfException.cpp
+ DwarfLabel.cpp
+ DwarfPrinter.cpp
+ DwarfWriter.cpp
+ OcamlGCPrinter.cpp
+ )
diff --git a/lib/CodeGen/AsmPrinter/DIE.cpp b/lib/CodeGen/AsmPrinter/DIE.cpp
new file mode 100644
index 0000000..349e0ac
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DIE.cpp
@@ -0,0 +1,431 @@
+//===--- lib/CodeGen/DIE.cpp - DWARF Info Entries -------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Data structures for DWARF info entries.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DIE.h"
+#include "DwarfPrinter.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/FormattedStream.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+// DIEAbbrevData Implementation
+//===----------------------------------------------------------------------===//
+
+/// Profile - Used to gather unique data for the abbreviation folding set.
+///
+void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const {
+ ID.AddInteger(Attribute);
+ ID.AddInteger(Form);
+}
+
+//===----------------------------------------------------------------------===//
+// DIEAbbrev Implementation
+//===----------------------------------------------------------------------===//
+
+/// Profile - Used to gather unique data for the abbreviation folding set.
+///
+void DIEAbbrev::Profile(FoldingSetNodeID &ID) const {
+ ID.AddInteger(Tag);
+ ID.AddInteger(ChildrenFlag);
+
+ // For each attribute description.
+ for (unsigned i = 0, N = Data.size(); i < N; ++i)
+ Data[i].Profile(ID);
+}
+
+/// Emit - Print the abbreviation using the specified asm printer.
+///
+void DIEAbbrev::Emit(const DwarfPrinter *DP) const {
+ // Emit its Dwarf tag type.
+ // FIXME: Doing work even in non-asm-verbose runs.
+ DP->EmitULEB128(Tag, dwarf::TagString(Tag));
+
+ // Emit whether it has children DIEs.
+ // FIXME: Doing work even in non-asm-verbose runs.
+ DP->EmitULEB128(ChildrenFlag, dwarf::ChildrenString(ChildrenFlag));
+
+ // For each attribute description.
+ for (unsigned i = 0, N = Data.size(); i < N; ++i) {
+ const DIEAbbrevData &AttrData = Data[i];
+
+ // Emit attribute type.
+ // FIXME: Doing work even in non-asm-verbose runs.
+ DP->EmitULEB128(AttrData.getAttribute(),
+ dwarf::AttributeString(AttrData.getAttribute()));
+
+ // Emit form type.
+ // FIXME: Doing work even in non-asm-verbose runs.
+ DP->EmitULEB128(AttrData.getForm(),
+ dwarf::FormEncodingString(AttrData.getForm()));
+ }
+
+ // Mark end of abbreviation.
+ DP->EmitULEB128(0, "EOM(1)");
+ DP->EmitULEB128(0, "EOM(2)");
+}
+
+#ifndef NDEBUG
+void DIEAbbrev::print(raw_ostream &O) {
+ O << "Abbreviation @"
+ << format("0x%lx", (long)(intptr_t)this)
+ << " "
+ << dwarf::TagString(Tag)
+ << " "
+ << dwarf::ChildrenString(ChildrenFlag)
+ << '\n';
+
+ for (unsigned i = 0, N = Data.size(); i < N; ++i) {
+ O << " "
+ << dwarf::AttributeString(Data[i].getAttribute())
+ << " "
+ << dwarf::FormEncodingString(Data[i].getForm())
+ << '\n';
+ }
+}
+void DIEAbbrev::dump() { print(dbgs()); }
+#endif
+
+//===----------------------------------------------------------------------===//
+// DIE Implementation
+//===----------------------------------------------------------------------===//
+
+DIE::~DIE() {
+ for (unsigned i = 0, N = Children.size(); i < N; ++i)
+ delete Children[i];
+}
+
+/// addSiblingOffset - Add a sibling offset field to the front of the DIE.
+///
+void DIE::addSiblingOffset() {
+ DIEInteger *DI = new DIEInteger(0);
+ Values.insert(Values.begin(), DI);
+ Abbrev.AddFirstAttribute(dwarf::DW_AT_sibling, dwarf::DW_FORM_ref4);
+}
+
+#ifndef NDEBUG
+void DIE::print(raw_ostream &O, unsigned IncIndent) {
+ IndentCount += IncIndent;
+ const std::string Indent(IndentCount, ' ');
+ bool isBlock = Abbrev.getTag() == 0;
+
+ if (!isBlock) {
+ O << Indent
+ << "Die: "
+ << format("0x%lx", (long)(intptr_t)this)
+ << ", Offset: " << Offset
+ << ", Size: " << Size
+ << "\n";
+
+ O << Indent
+ << dwarf::TagString(Abbrev.getTag())
+ << " "
+ << dwarf::ChildrenString(Abbrev.getChildrenFlag());
+ } else {
+ O << "Size: " << Size;
+ }
+ O << "\n";
+
+ const SmallVector<DIEAbbrevData, 8> &Data = Abbrev.getData();
+
+ IndentCount += 2;
+ for (unsigned i = 0, N = Data.size(); i < N; ++i) {
+ O << Indent;
+
+ if (!isBlock)
+ O << dwarf::AttributeString(Data[i].getAttribute());
+ else
+ O << "Blk[" << i << "]";
+
+ O << " "
+ << dwarf::FormEncodingString(Data[i].getForm())
+ << " ";
+ Values[i]->print(O);
+ O << "\n";
+ }
+ IndentCount -= 2;
+
+ for (unsigned j = 0, M = Children.size(); j < M; ++j) {
+ Children[j]->print(O, 4);
+ }
+
+ if (!isBlock) O << "\n";
+ IndentCount -= IncIndent;
+}
+
+void DIE::dump() {
+ print(dbgs());
+}
+#endif
+
+
+#ifndef NDEBUG
+void DIEValue::dump() {
+ print(dbgs());
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+// DIEInteger Implementation
+//===----------------------------------------------------------------------===//
+
+/// EmitValue - Emit integer of appropriate size.
+///
+void DIEInteger::EmitValue(DwarfPrinter *D, unsigned Form) const {
+ const AsmPrinter *Asm = D->getAsm();
+ unsigned Size = ~0U;
+ switch (Form) {
+ case dwarf::DW_FORM_flag: // Fall thru
+ case dwarf::DW_FORM_ref1: // Fall thru
+ case dwarf::DW_FORM_data1: Size = 1; break;
+ case dwarf::DW_FORM_ref2: // Fall thru
+ case dwarf::DW_FORM_data2: Size = 2; break;
+ case dwarf::DW_FORM_ref4: // Fall thru
+ case dwarf::DW_FORM_data4: Size = 4; break;
+ case dwarf::DW_FORM_ref8: // Fall thru
+ case dwarf::DW_FORM_data8: Size = 8; break;
+ case dwarf::DW_FORM_udata: D->EmitULEB128(Integer); return;
+ case dwarf::DW_FORM_sdata: D->EmitSLEB128(Integer, ""); return;
+ default: llvm_unreachable("DIE Value form not supported yet");
+ }
+ Asm->OutStreamer.EmitIntValue(Integer, Size, 0/*addrspace*/);
+}
+
+/// SizeOf - Determine size of integer value in bytes.
+///
+unsigned DIEInteger::SizeOf(const TargetData *TD, unsigned Form) const {
+ switch (Form) {
+ case dwarf::DW_FORM_flag: // Fall thru
+ case dwarf::DW_FORM_ref1: // Fall thru
+ case dwarf::DW_FORM_data1: return sizeof(int8_t);
+ case dwarf::DW_FORM_ref2: // Fall thru
+ case dwarf::DW_FORM_data2: return sizeof(int16_t);
+ case dwarf::DW_FORM_ref4: // Fall thru
+ case dwarf::DW_FORM_data4: return sizeof(int32_t);
+ case dwarf::DW_FORM_ref8: // Fall thru
+ case dwarf::DW_FORM_data8: return sizeof(int64_t);
+ case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer);
+ case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer);
+ default: llvm_unreachable("DIE Value form not supported yet"); break;
+ }
+ return 0;
+}
+
+#ifndef NDEBUG
+void DIEInteger::print(raw_ostream &O) {
+ O << "Int: " << (int64_t)Integer
+ << format(" 0x%llx", (unsigned long long)Integer);
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+// DIEString Implementation
+//===----------------------------------------------------------------------===//
+
+/// EmitValue - Emit string value.
+///
+void DIEString::EmitValue(DwarfPrinter *D, unsigned Form) const {
+ D->getAsm()->OutStreamer.EmitBytes(Str, /*addrspace*/0);
+ // Emit nul terminator.
+ D->getAsm()->OutStreamer.EmitIntValue(0, 1, /*addrspace*/0);
+}
+
+#ifndef NDEBUG
+void DIEString::print(raw_ostream &O) {
+ O << "Str: \"" << Str << "\"";
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+// DIEDwarfLabel Implementation
+//===----------------------------------------------------------------------===//
+
+/// EmitValue - Emit label value.
+///
+void DIEDwarfLabel::EmitValue(DwarfPrinter *D, unsigned Form) const {
+ bool IsSmall = Form == dwarf::DW_FORM_data4;
+ D->EmitReference(Label, false, IsSmall);
+}
+
+/// SizeOf - Determine size of label value in bytes.
+///
+unsigned DIEDwarfLabel::SizeOf(const TargetData *TD, unsigned Form) const {
+ if (Form == dwarf::DW_FORM_data4) return 4;
+ return TD->getPointerSize();
+}
+
+#ifndef NDEBUG
+void DIEDwarfLabel::print(raw_ostream &O) {
+ O << "Lbl: ";
+ Label.print(O);
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+// DIEObjectLabel Implementation
+//===----------------------------------------------------------------------===//
+
+/// EmitValue - Emit label value.
+///
+void DIEObjectLabel::EmitValue(DwarfPrinter *D, unsigned Form) const {
+ bool IsSmall = Form == dwarf::DW_FORM_data4;
+ D->EmitReference(Sym, false, IsSmall);
+}
+
+/// SizeOf - Determine size of label value in bytes.
+///
+unsigned DIEObjectLabel::SizeOf(const TargetData *TD, unsigned Form) const {
+ if (Form == dwarf::DW_FORM_data4) return 4;
+ return TD->getPointerSize();
+}
+
+#ifndef NDEBUG
+void DIEObjectLabel::print(raw_ostream &O) {
+ O << "Obj: " << Sym->getName();
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+// DIESectionOffset Implementation
+//===----------------------------------------------------------------------===//
+
+/// EmitValue - Emit delta value.
+///
+void DIESectionOffset::EmitValue(DwarfPrinter *D, unsigned Form) const {
+ bool IsSmall = Form == dwarf::DW_FORM_data4;
+ D->EmitSectionOffset(Label.getTag(), Section.getTag(),
+ Label.getNumber(), Section.getNumber(),
+ IsSmall, IsEH, UseSet);
+}
+
+/// SizeOf - Determine size of delta value in bytes.
+///
+unsigned DIESectionOffset::SizeOf(const TargetData *TD, unsigned Form) const {
+ if (Form == dwarf::DW_FORM_data4) return 4;
+ return TD->getPointerSize();
+}
+
+#ifndef NDEBUG
+void DIESectionOffset::print(raw_ostream &O) {
+ O << "Off: ";
+ Label.print(O);
+ O << "-";
+ Section.print(O);
+ O << "-" << IsEH << "-" << UseSet;
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+// DIEDelta Implementation
+//===----------------------------------------------------------------------===//
+
+/// EmitValue - Emit delta value.
+///
+void DIEDelta::EmitValue(DwarfPrinter *D, unsigned Form) const {
+ bool IsSmall = Form == dwarf::DW_FORM_data4;
+ D->EmitDifference(LabelHi, LabelLo, IsSmall);
+}
+
+/// SizeOf - Determine size of delta value in bytes.
+///
+unsigned DIEDelta::SizeOf(const TargetData *TD, unsigned Form) const {
+ if (Form == dwarf::DW_FORM_data4) return 4;
+ return TD->getPointerSize();
+}
+
+#ifndef NDEBUG
+void DIEDelta::print(raw_ostream &O) {
+ O << "Del: ";
+ LabelHi.print(O);
+ O << "-";
+ LabelLo.print(O);
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+// DIEEntry Implementation
+//===----------------------------------------------------------------------===//
+
+/// EmitValue - Emit debug information entry offset.
+///
+void DIEEntry::EmitValue(DwarfPrinter *D, unsigned Form) const {
+ D->getAsm()->EmitInt32(Entry->getOffset());
+}
+
+#ifndef NDEBUG
+void DIEEntry::print(raw_ostream &O) {
+ O << format("Die: 0x%lx", (long)(intptr_t)Entry);
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+// DIEBlock Implementation
+//===----------------------------------------------------------------------===//
+
+/// ComputeSize - calculate the size of the block.
+///
+unsigned DIEBlock::ComputeSize(const TargetData *TD) {
+ if (!Size) {
+ const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
+ for (unsigned i = 0, N = Values.size(); i < N; ++i)
+ Size += Values[i]->SizeOf(TD, AbbrevData[i].getForm());
+ }
+
+ return Size;
+}
+
+/// EmitValue - Emit block data.
+///
+void DIEBlock::EmitValue(DwarfPrinter *D, unsigned Form) const {
+ const AsmPrinter *Asm = D->getAsm();
+ switch (Form) {
+ case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break;
+ case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break;
+ case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break;
+ case dwarf::DW_FORM_block: D->EmitULEB128(Size); break;
+ default: llvm_unreachable("Improper form for block"); break;
+ }
+
+ const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
+ for (unsigned i = 0, N = Values.size(); i < N; ++i) {
+ Asm->O << '\n';
+ Values[i]->EmitValue(D, AbbrevData[i].getForm());
+ }
+}
+
+/// SizeOf - Determine size of block data in bytes.
+///
+unsigned DIEBlock::SizeOf(const TargetData *TD, unsigned Form) const {
+ switch (Form) {
+ case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
+ case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
+ case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
+ case dwarf::DW_FORM_block: return Size + MCAsmInfo::getULEB128Size(Size);
+ default: llvm_unreachable("Improper form for block"); break;
+ }
+ return 0;
+}
+
+#ifndef NDEBUG
+void DIEBlock::print(raw_ostream &O) {
+ O << "Blk: ";
+ DIE::print(O, 5);
+}
+#endif
diff --git a/lib/CodeGen/AsmPrinter/DIE.h b/lib/CodeGen/AsmPrinter/DIE.h
new file mode 100644
index 0000000..af90289
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DIE.h
@@ -0,0 +1,494 @@
+//===--- lib/CodeGen/DIE.h - DWARF Info Entries -----------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Data structures for DWARF info entries.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CODEGEN_ASMPRINTER_DIE_H__
+#define CODEGEN_ASMPRINTER_DIE_H__
+
+#include "DwarfLabel.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Dwarf.h"
+#include <vector>
+
+namespace llvm {
+ class AsmPrinter;
+ class DwarfPrinter;
+ class TargetData;
+ class MCSymbol;
+
+ //===--------------------------------------------------------------------===//
+ /// DIEAbbrevData - Dwarf abbreviation data, describes the one attribute of a
+ /// Dwarf abbreviation.
+ class DIEAbbrevData {
+ /// Attribute - Dwarf attribute code.
+ ///
+ unsigned Attribute;
+
+ /// Form - Dwarf form code.
+ ///
+ unsigned Form;
+ public:
+ DIEAbbrevData(unsigned A, unsigned F) : Attribute(A), Form(F) {}
+
+ // Accessors.
+ unsigned getAttribute() const { return Attribute; }
+ unsigned getForm() const { return Form; }
+
+ /// Profile - Used to gather unique data for the abbreviation folding set.
+ ///
+ void Profile(FoldingSetNodeID &ID) const;
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIEAbbrev - Dwarf abbreviation, describes the organization of a debug
+ /// information object.
+ class DIEAbbrev : public FoldingSetNode {
+ /// Tag - Dwarf tag code.
+ ///
+ unsigned Tag;
+
+ /// Unique number for node.
+ ///
+ unsigned Number;
+
+ /// ChildrenFlag - Dwarf children flag.
+ ///
+ unsigned ChildrenFlag;
+
+ /// Data - Raw data bytes for abbreviation.
+ ///
+ SmallVector<DIEAbbrevData, 8> Data;
+
+ public:
+ DIEAbbrev(unsigned T, unsigned C) : Tag(T), ChildrenFlag(C), Data() {}
+ virtual ~DIEAbbrev() {}
+
+ // Accessors.
+ unsigned getTag() const { return Tag; }
+ unsigned getNumber() const { return Number; }
+ unsigned getChildrenFlag() const { return ChildrenFlag; }
+ const SmallVector<DIEAbbrevData, 8> &getData() const { return Data; }
+ void setTag(unsigned T) { Tag = T; }
+ void setChildrenFlag(unsigned CF) { ChildrenFlag = CF; }
+ void setNumber(unsigned N) { Number = N; }
+
+ /// AddAttribute - Adds another set of attribute information to the
+ /// abbreviation.
+ void AddAttribute(unsigned Attribute, unsigned Form) {
+ Data.push_back(DIEAbbrevData(Attribute, Form));
+ }
+
+ /// AddFirstAttribute - Adds a set of attribute information to the front
+ /// of the abbreviation.
+ void AddFirstAttribute(unsigned Attribute, unsigned Form) {
+ Data.insert(Data.begin(), DIEAbbrevData(Attribute, Form));
+ }
+
+ /// Profile - Used to gather unique data for the abbreviation folding set.
+ ///
+ void Profile(FoldingSetNodeID &ID) const;
+
+ /// Emit - Print the abbreviation using the specified asm printer.
+ ///
+ void Emit(const DwarfPrinter *DP) const;
+
+#ifndef NDEBUG
+ void print(raw_ostream &O);
+ void dump();
+#endif
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIE - A structured debug information entry. Has an abbreviation which
+ /// describes it's organization.
+ class CompileUnit;
+ class DIEValue;
+
+ class DIE {
+ protected:
+ /// Abbrev - Buffer for constructing abbreviation.
+ ///
+ DIEAbbrev Abbrev;
+
+ /// Offset - Offset in debug info section.
+ ///
+ unsigned Offset;
+
+ /// Size - Size of instance + children.
+ ///
+ unsigned Size;
+
+ /// Children DIEs.
+ ///
+ std::vector<DIE *> Children;
+
+ DIE *Parent;
+
+ /// Attributes values.
+ ///
+ SmallVector<DIEValue*, 32> Values;
+
+ // Private data for print()
+ mutable unsigned IndentCount;
+ public:
+ explicit DIE(unsigned Tag)
+ : Abbrev(Tag, dwarf::DW_CHILDREN_no), Offset(0),
+ Size(0), Parent (0), IndentCount(0) {}
+ virtual ~DIE();
+
+ // Accessors.
+ DIEAbbrev &getAbbrev() { return Abbrev; }
+ unsigned getAbbrevNumber() const { return Abbrev.getNumber(); }
+ unsigned getTag() const { return Abbrev.getTag(); }
+ unsigned getOffset() const { return Offset; }
+ unsigned getSize() const { return Size; }
+ const std::vector<DIE *> &getChildren() const { return Children; }
+ SmallVector<DIEValue*, 32> &getValues() { return Values; }
+ DIE *getParent() const { return Parent; }
+ void setTag(unsigned Tag) { Abbrev.setTag(Tag); }
+ void setOffset(unsigned O) { Offset = O; }
+ void setSize(unsigned S) { Size = S; }
+ void setParent(DIE *P) { Parent = P; }
+
+ /// addValue - Add a value and attributes to a DIE.
+ ///
+ void addValue(unsigned Attribute, unsigned Form, DIEValue *Value) {
+ Abbrev.AddAttribute(Attribute, Form);
+ Values.push_back(Value);
+ }
+
+ /// SiblingOffset - Return the offset of the debug information entry's
+ /// sibling.
+ unsigned getSiblingOffset() const { return Offset + Size; }
+
+ /// addSiblingOffset - Add a sibling offset field to the front of the DIE.
+ ///
+ void addSiblingOffset();
+
+ /// addChild - Add a child to the DIE.
+ ///
+ void addChild(DIE *Child) {
+ if (Child->getParent()) {
+ assert (Child->getParent() == this && "Unexpected DIE Parent!");
+ return;
+ }
+ Abbrev.setChildrenFlag(dwarf::DW_CHILDREN_yes);
+ Children.push_back(Child);
+ Child->setParent(this);
+ }
+
+#ifndef NDEBUG
+ void print(raw_ostream &O, unsigned IncIndent = 0);
+ void dump();
+#endif
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIEValue - A debug information entry value.
+ ///
+ class DIEValue {
+ public:
+ enum {
+ isInteger,
+ isString,
+ isLabel,
+ isAsIsLabel,
+ isSectionOffset,
+ isDelta,
+ isEntry,
+ isBlock
+ };
+ protected:
+ /// Type - Type of data stored in the value.
+ ///
+ unsigned Type;
+ public:
+ explicit DIEValue(unsigned T) : Type(T) {}
+ virtual ~DIEValue() {}
+
+ // Accessors
+ unsigned getType() const { return Type; }
+
+ /// EmitValue - Emit value via the Dwarf writer.
+ ///
+ virtual void EmitValue(DwarfPrinter *D, unsigned Form) const = 0;
+
+ /// SizeOf - Return the size of a value in bytes.
+ ///
+ virtual unsigned SizeOf(const TargetData *TD, unsigned Form) const = 0;
+
+ // Implement isa/cast/dyncast.
+ static bool classof(const DIEValue *) { return true; }
+
+#ifndef NDEBUG
+ virtual void print(raw_ostream &O) = 0;
+ void dump();
+#endif
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIEInteger - An integer value DIE.
+ ///
+ class DIEInteger : public DIEValue {
+ uint64_t Integer;
+ public:
+ explicit DIEInteger(uint64_t I) : DIEValue(isInteger), Integer(I) {}
+
+ /// BestForm - Choose the best form for integer.
+ ///
+ static unsigned BestForm(bool IsSigned, uint64_t Int) {
+ if (IsSigned) {
+ if ((char)Int == (signed)Int) return dwarf::DW_FORM_data1;
+ if ((short)Int == (signed)Int) return dwarf::DW_FORM_data2;
+ if ((int)Int == (signed)Int) return dwarf::DW_FORM_data4;
+ } else {
+ if ((unsigned char)Int == Int) return dwarf::DW_FORM_data1;
+ if ((unsigned short)Int == Int) return dwarf::DW_FORM_data2;
+ if ((unsigned int)Int == Int) return dwarf::DW_FORM_data4;
+ }
+ return dwarf::DW_FORM_data8;
+ }
+
+ /// EmitValue - Emit integer of appropriate size.
+ ///
+ virtual void EmitValue(DwarfPrinter *D, unsigned Form) const;
+
+ /// SizeOf - Determine size of integer value in bytes.
+ ///
+ virtual unsigned SizeOf(const TargetData *TD, unsigned Form) const;
+
+
+ // Implement isa/cast/dyncast.
+ static bool classof(const DIEInteger *) { return true; }
+ static bool classof(const DIEValue *I) { return I->getType() == isInteger; }
+
+#ifndef NDEBUG
+ virtual void print(raw_ostream &O);
+#endif
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIEString - A string value DIE. This DIE keeps string reference only.
+ ///
+ class DIEString : public DIEValue {
+ const StringRef Str;
+ public:
+ explicit DIEString(const StringRef S) : DIEValue(isString), Str(S) {}
+
+ /// EmitValue - Emit string value.
+ ///
+ virtual void EmitValue(DwarfPrinter *D, unsigned Form) const;
+
+ /// SizeOf - Determine size of string value in bytes.
+ ///
+ virtual unsigned SizeOf(const TargetData *, unsigned /*Form*/) const {
+ return Str.size() + sizeof(char); // sizeof('\0');
+ }
+
+ // Implement isa/cast/dyncast.
+ static bool classof(const DIEString *) { return true; }
+ static bool classof(const DIEValue *S) { return S->getType() == isString; }
+
+#ifndef NDEBUG
+ virtual void print(raw_ostream &O);
+#endif
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIEDwarfLabel - A Dwarf internal label expression DIE.
+ //
+ class DIEDwarfLabel : public DIEValue {
+ const DWLabel Label;
+ public:
+ explicit DIEDwarfLabel(const DWLabel &L) : DIEValue(isLabel), Label(L) {}
+
+ /// EmitValue - Emit label value.
+ ///
+ virtual void EmitValue(DwarfPrinter *D, unsigned Form) const;
+
+ /// SizeOf - Determine size of label value in bytes.
+ ///
+ virtual unsigned SizeOf(const TargetData *TD, unsigned Form) const;
+
+ // Implement isa/cast/dyncast.
+ static bool classof(const DIEDwarfLabel *) { return true; }
+ static bool classof(const DIEValue *L) { return L->getType() == isLabel; }
+
+#ifndef NDEBUG
+ virtual void print(raw_ostream &O);
+#endif
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIEObjectLabel - A label to an object in code or data.
+ //
+ class DIEObjectLabel : public DIEValue {
+ const MCSymbol *Sym;
+ public:
+ explicit DIEObjectLabel(const MCSymbol *S)
+ : DIEValue(isAsIsLabel), Sym(S) {}
+
+ /// EmitValue - Emit label value.
+ ///
+ virtual void EmitValue(DwarfPrinter *D, unsigned Form) const;
+
+ /// SizeOf - Determine size of label value in bytes.
+ ///
+ virtual unsigned SizeOf(const TargetData *TD, unsigned Form) const;
+
+ // Implement isa/cast/dyncast.
+ static bool classof(const DIEObjectLabel *) { return true; }
+ static bool classof(const DIEValue *L) {
+ return L->getType() == isAsIsLabel;
+ }
+
+#ifndef NDEBUG
+ virtual void print(raw_ostream &O);
+#endif
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIESectionOffset - A section offset DIE.
+ ///
+ class DIESectionOffset : public DIEValue {
+ const DWLabel Label;
+ const DWLabel Section;
+ bool IsEH : 1;
+ bool UseSet : 1;
+ public:
+ DIESectionOffset(const DWLabel &Lab, const DWLabel &Sec,
+ bool isEH = false, bool useSet = true)
+ : DIEValue(isSectionOffset), Label(Lab), Section(Sec),
+ IsEH(isEH), UseSet(useSet) {}
+
+ /// EmitValue - Emit section offset.
+ ///
+ virtual void EmitValue(DwarfPrinter *D, unsigned Form) const;
+
+ /// SizeOf - Determine size of section offset value in bytes.
+ ///
+ virtual unsigned SizeOf(const TargetData *TD, unsigned Form) const;
+
+ // Implement isa/cast/dyncast.
+ static bool classof(const DIESectionOffset *) { return true; }
+ static bool classof(const DIEValue *D) {
+ return D->getType() == isSectionOffset;
+ }
+
+#ifndef NDEBUG
+ virtual void print(raw_ostream &O);
+#endif
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIEDelta - A simple label difference DIE.
+ ///
+ class DIEDelta : public DIEValue {
+ const DWLabel LabelHi;
+ const DWLabel LabelLo;
+ public:
+ DIEDelta(const DWLabel &Hi, const DWLabel &Lo)
+ : DIEValue(isDelta), LabelHi(Hi), LabelLo(Lo) {}
+
+ /// EmitValue - Emit delta value.
+ ///
+ virtual void EmitValue(DwarfPrinter *D, unsigned Form) const;
+
+ /// SizeOf - Determine size of delta value in bytes.
+ ///
+ virtual unsigned SizeOf(const TargetData *TD, unsigned Form) const;
+
+ // Implement isa/cast/dyncast.
+ static bool classof(const DIEDelta *) { return true; }
+ static bool classof(const DIEValue *D) { return D->getType() == isDelta; }
+
+#ifndef NDEBUG
+ virtual void print(raw_ostream &O);
+#endif
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIEntry - A pointer to another debug information entry. An instance of
+ /// this class can also be used as a proxy for a debug information entry not
+ /// yet defined (ie. types.)
+ class DIEEntry : public DIEValue {
+ DIE *Entry;
+ public:
+ explicit DIEEntry(DIE *E) : DIEValue(isEntry), Entry(E) {}
+
+ DIE *getEntry() const { return Entry; }
+ void setEntry(DIE *E) { Entry = E; }
+
+ /// EmitValue - Emit debug information entry offset.
+ ///
+ virtual void EmitValue(DwarfPrinter *D, unsigned Form) const;
+
+ /// SizeOf - Determine size of debug information entry in bytes.
+ ///
+ virtual unsigned SizeOf(const TargetData *TD, unsigned Form) const {
+ return sizeof(int32_t);
+ }
+
+ // Implement isa/cast/dyncast.
+ static bool classof(const DIEEntry *) { return true; }
+ static bool classof(const DIEValue *E) { return E->getType() == isEntry; }
+
+#ifndef NDEBUG
+ virtual void print(raw_ostream &O);
+#endif
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// DIEBlock - A block of values. Primarily used for location expressions.
+ //
+ class DIEBlock : public DIEValue, public DIE {
+ unsigned Size; // Size in bytes excluding size header.
+ public:
+ DIEBlock()
+ : DIEValue(isBlock), DIE(0), Size(0) {}
+ virtual ~DIEBlock() {}
+
+ /// ComputeSize - calculate the size of the block.
+ ///
+ unsigned ComputeSize(const TargetData *TD);
+
+ /// BestForm - Choose the best form for data.
+ ///
+ unsigned BestForm() const {
+ if ((unsigned char)Size == Size) return dwarf::DW_FORM_block1;
+ if ((unsigned short)Size == Size) return dwarf::DW_FORM_block2;
+ if ((unsigned int)Size == Size) return dwarf::DW_FORM_block4;
+ return dwarf::DW_FORM_block;
+ }
+
+ /// EmitValue - Emit block data.
+ ///
+ virtual void EmitValue(DwarfPrinter *D, unsigned Form) const;
+
+ /// SizeOf - Determine size of block data in bytes.
+ ///
+ virtual unsigned SizeOf(const TargetData *TD, unsigned Form) const;
+
+ // Implement isa/cast/dyncast.
+ static bool classof(const DIEBlock *) { return true; }
+ static bool classof(const DIEValue *E) { return E->getType() == isBlock; }
+
+#ifndef NDEBUG
+ virtual void print(raw_ostream &O);
+#endif
+ };
+
+} // end llvm namespace
+
+#endif
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
new file mode 100644
index 0000000..5093dd9
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -0,0 +1,3011 @@
+//===-- llvm/CodeGen/DwarfDebug.cpp - Dwarf Debug Framework ---------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing dwarf debug info into asm files.
+//
+//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "dwarfdebug"
+#include "DwarfDebug.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetFrameInfo.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ValueHandle.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/Timer.h"
+#include "llvm/System/Path.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+
+/// Configuration values for initial hash set sizes (log2).
+///
+static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
+
+namespace llvm {
+
+//===----------------------------------------------------------------------===//
+/// CompileUnit - This dwarf writer support class manages information associate
+/// with a source file.
+class CompileUnit {
+ /// ID - File identifier for source.
+ ///
+ unsigned ID;
+
+ /// Die - Compile unit debug information entry.
+ ///
+ DIE *CUDie;
+
+ /// IndexTyDie - An anonymous type for index type.
+ DIE *IndexTyDie;
+
+ /// GVToDieMap - Tracks the mapping of unit level debug informaton
+ /// variables to debug information entries.
+ /// FIXME : Rename GVToDieMap -> NodeToDieMap
+ DenseMap<MDNode *, DIE *> GVToDieMap;
+
+ /// GVToDIEEntryMap - Tracks the mapping of unit level debug informaton
+ /// descriptors to debug information entries using a DIEEntry proxy.
+ /// FIXME : Rename
+ DenseMap<MDNode *, DIEEntry *> GVToDIEEntryMap;
+
+ /// Globals - A map of globally visible named entities for this unit.
+ ///
+ StringMap<DIE*> Globals;
+
+ /// GlobalTypes - A map of globally visible types for this unit.
+ ///
+ StringMap<DIE*> GlobalTypes;
+
+public:
+ CompileUnit(unsigned I, DIE *D)
+ : ID(I), CUDie(D), IndexTyDie(0) {}
+ ~CompileUnit() { delete CUDie; delete IndexTyDie; }
+
+ // Accessors.
+ unsigned getID() const { return ID; }
+ DIE* getCUDie() const { return CUDie; }
+ const StringMap<DIE*> &getGlobals() const { return Globals; }
+ const StringMap<DIE*> &getGlobalTypes() const { return GlobalTypes; }
+
+ /// hasContent - Return true if this compile unit has something to write out.
+ ///
+ bool hasContent() const { return !CUDie->getChildren().empty(); }
+
+ /// addGlobal - Add a new global entity to the compile unit.
+ ///
+ void addGlobal(const std::string &Name, DIE *Die) { Globals[Name] = Die; }
+
+ /// addGlobalType - Add a new global type to the compile unit.
+ ///
+ void addGlobalType(const std::string &Name, DIE *Die) {
+ GlobalTypes[Name] = Die;
+ }
+
+ /// getDIE - Returns the debug information entry map slot for the
+ /// specified debug variable.
+ DIE *getDIE(MDNode *N) { return GVToDieMap.lookup(N); }
+
+ /// insertDIE - Insert DIE into the map.
+ void insertDIE(MDNode *N, DIE *D) {
+ GVToDieMap.insert(std::make_pair(N, D));
+ }
+
+ /// getDIEEntry - Returns the debug information entry for the speciefied
+ /// debug variable.
+ DIEEntry *getDIEEntry(MDNode *N) {
+ DenseMap<MDNode *, DIEEntry *>::iterator I = GVToDIEEntryMap.find(N);
+ if (I == GVToDIEEntryMap.end())
+ return NULL;
+ return I->second;
+ }
+
+ /// insertDIEEntry - Insert debug information entry into the map.
+ void insertDIEEntry(MDNode *N, DIEEntry *E) {
+ GVToDIEEntryMap.insert(std::make_pair(N, E));
+ }
+
+ /// addDie - Adds or interns the DIE to the compile unit.
+ ///
+ void addDie(DIE *Buffer) {
+ this->CUDie->addChild(Buffer);
+ }
+
+ // getIndexTyDie - Get an anonymous type for index type.
+ DIE *getIndexTyDie() {
+ return IndexTyDie;
+ }
+
+ // setIndexTyDie - Set D as anonymous type for index which can be reused
+ // later.
+ void setIndexTyDie(DIE *D) {
+ IndexTyDie = D;
+ }
+
+};
+
+//===----------------------------------------------------------------------===//
+/// DbgVariable - This class is used to track local variable information.
+///
+class DbgVariable {
+ DIVariable Var; // Variable Descriptor.
+ unsigned FrameIndex; // Variable frame index.
+ DbgVariable *AbstractVar; // Abstract variable for this variable.
+ DIE *TheDIE;
+public:
+ DbgVariable(DIVariable V, unsigned I)
+ : Var(V), FrameIndex(I), AbstractVar(0), TheDIE(0) {}
+
+ // Accessors.
+ DIVariable getVariable() const { return Var; }
+ unsigned getFrameIndex() const { return FrameIndex; }
+ void setAbstractVariable(DbgVariable *V) { AbstractVar = V; }
+ DbgVariable *getAbstractVariable() const { return AbstractVar; }
+ void setDIE(DIE *D) { TheDIE = D; }
+ DIE *getDIE() const { return TheDIE; }
+};
+
+//===----------------------------------------------------------------------===//
+/// DbgScope - This class is used to track scope information.
+///
+class DbgScope {
+ DbgScope *Parent; // Parent to this scope.
+ DIDescriptor Desc; // Debug info descriptor for scope.
+ // Location at which this scope is inlined.
+ AssertingVH<MDNode> InlinedAtLocation;
+ bool AbstractScope; // Abstract Scope
+ unsigned StartLabelID; // Label ID of the beginning of scope.
+ unsigned EndLabelID; // Label ID of the end of scope.
+ const MachineInstr *LastInsn; // Last instruction of this scope.
+ const MachineInstr *FirstInsn; // First instruction of this scope.
+ SmallVector<DbgScope *, 4> Scopes; // Scopes defined in scope.
+ SmallVector<DbgVariable *, 8> Variables;// Variables declared in scope.
+
+ // Private state for dump()
+ mutable unsigned IndentLevel;
+public:
+ DbgScope(DbgScope *P, DIDescriptor D, MDNode *I = 0)
+ : Parent(P), Desc(D), InlinedAtLocation(I), AbstractScope(false),
+ StartLabelID(0), EndLabelID(0),
+ LastInsn(0), FirstInsn(0), IndentLevel(0) {}
+ virtual ~DbgScope();
+
+ // Accessors.
+ DbgScope *getParent() const { return Parent; }
+ void setParent(DbgScope *P) { Parent = P; }
+ DIDescriptor getDesc() const { return Desc; }
+ MDNode *getInlinedAt() const {
+ return InlinedAtLocation;
+ }
+ MDNode *getScopeNode() const { return Desc.getNode(); }
+ unsigned getStartLabelID() const { return StartLabelID; }
+ unsigned getEndLabelID() const { return EndLabelID; }
+ SmallVector<DbgScope *, 4> &getScopes() { return Scopes; }
+ SmallVector<DbgVariable *, 8> &getVariables() { return Variables; }
+ void setStartLabelID(unsigned S) { StartLabelID = S; }
+ void setEndLabelID(unsigned E) { EndLabelID = E; }
+ void setLastInsn(const MachineInstr *MI) { LastInsn = MI; }
+ const MachineInstr *getLastInsn() { return LastInsn; }
+ void setFirstInsn(const MachineInstr *MI) { FirstInsn = MI; }
+ void setAbstractScope() { AbstractScope = true; }
+ bool isAbstractScope() const { return AbstractScope; }
+ const MachineInstr *getFirstInsn() { return FirstInsn; }
+
+ /// addScope - Add a scope to the scope.
+ ///
+ void addScope(DbgScope *S) { Scopes.push_back(S); }
+
+ /// addVariable - Add a variable to the scope.
+ ///
+ void addVariable(DbgVariable *V) { Variables.push_back(V); }
+
+ void fixInstructionMarkers(DenseMap<const MachineInstr *,
+ unsigned> &MIIndexMap) {
+ assert (getFirstInsn() && "First instruction is missing!");
+
+ // Use the end of last child scope as end of this scope.
+ SmallVector<DbgScope *, 4> &Scopes = getScopes();
+ const MachineInstr *LastInsn = getFirstInsn();
+ unsigned LIndex = 0;
+ if (Scopes.empty()) {
+ assert (getLastInsn() && "Inner most scope does not have last insn!");
+ return;
+ }
+ for (SmallVector<DbgScope *, 4>::iterator SI = Scopes.begin(),
+ SE = Scopes.end(); SI != SE; ++SI) {
+ DbgScope *DS = *SI;
+ DS->fixInstructionMarkers(MIIndexMap);
+ const MachineInstr *DSLastInsn = DS->getLastInsn();
+ unsigned DSI = MIIndexMap[DSLastInsn];
+ if (DSI > LIndex) {
+ LastInsn = DSLastInsn;
+ LIndex = DSI;
+ }
+ }
+ setLastInsn(LastInsn);
+ }
+
+#ifndef NDEBUG
+ void dump() const;
+#endif
+};
+
+#ifndef NDEBUG
+void DbgScope::dump() const {
+ raw_ostream &err = dbgs();
+ err.indent(IndentLevel);
+ MDNode *N = Desc.getNode();
+ N->dump();
+ err << " [" << StartLabelID << ", " << EndLabelID << "]\n";
+ if (AbstractScope)
+ err << "Abstract Scope\n";
+
+ IndentLevel += 2;
+ if (!Scopes.empty())
+ err << "Children ...\n";
+ for (unsigned i = 0, e = Scopes.size(); i != e; ++i)
+ if (Scopes[i] != this)
+ Scopes[i]->dump();
+
+ IndentLevel -= 2;
+}
+#endif
+
+DbgScope::~DbgScope() {
+ for (unsigned i = 0, N = Scopes.size(); i < N; ++i)
+ delete Scopes[i];
+ for (unsigned j = 0, M = Variables.size(); j < M; ++j)
+ delete Variables[j];
+}
+
+} // end llvm namespace
+
+DwarfDebug::DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T)
+ : DwarfPrinter(OS, A, T, "dbg"), ModuleCU(0),
+ AbbreviationsSet(InitAbbreviationsSetSize), Abbreviations(),
+ DIEValues(), StringPool(),
+ SectionSourceLines(), didInitial(false), shouldEmit(false),
+ CurrentFnDbgScope(0), DebugTimer(0) {
+ if (TimePassesIsEnabled)
+ DebugTimer = new Timer("Dwarf Debug Writer");
+}
+DwarfDebug::~DwarfDebug() {
+ for (unsigned j = 0, M = DIEValues.size(); j < M; ++j)
+ delete DIEValues[j];
+
+ delete DebugTimer;
+}
+
+/// assignAbbrevNumber - Define a unique number for the abbreviation.
+///
+void DwarfDebug::assignAbbrevNumber(DIEAbbrev &Abbrev) {
+ // Profile the node so that we can make it unique.
+ FoldingSetNodeID ID;
+ Abbrev.Profile(ID);
+
+ // Check the set for priors.
+ DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
+
+ // If it's newly added.
+ if (InSet == &Abbrev) {
+ // Add to abbreviation list.
+ Abbreviations.push_back(&Abbrev);
+
+ // Assign the vector position + 1 as its number.
+ Abbrev.setNumber(Abbreviations.size());
+ } else {
+ // Assign existing abbreviation number.
+ Abbrev.setNumber(InSet->getNumber());
+ }
+}
+
+/// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
+/// information entry.
+DIEEntry *DwarfDebug::createDIEEntry(DIE *Entry) {
+ DIEEntry *Value = new DIEEntry(Entry);
+ DIEValues.push_back(Value);
+ return Value;
+}
+
+/// addUInt - Add an unsigned integer attribute data and value.
+///
+void DwarfDebug::addUInt(DIE *Die, unsigned Attribute,
+ unsigned Form, uint64_t Integer) {
+ if (!Form) Form = DIEInteger::BestForm(false, Integer);
+ DIEValue *Value = new DIEInteger(Integer);
+ DIEValues.push_back(Value);
+ Die->addValue(Attribute, Form, Value);
+}
+
+/// addSInt - Add an signed integer attribute data and value.
+///
+void DwarfDebug::addSInt(DIE *Die, unsigned Attribute,
+ unsigned Form, int64_t Integer) {
+ if (!Form) Form = DIEInteger::BestForm(true, Integer);
+ DIEValue *Value = new DIEInteger(Integer);
+ DIEValues.push_back(Value);
+ Die->addValue(Attribute, Form, Value);
+}
+
+/// addString - Add a string attribute data and value. DIEString only
+/// keeps string reference.
+void DwarfDebug::addString(DIE *Die, unsigned Attribute, unsigned Form,
+ StringRef String) {
+ DIEValue *Value = new DIEString(String);
+ DIEValues.push_back(Value);
+ Die->addValue(Attribute, Form, Value);
+}
+
+/// addLabel - Add a Dwarf label attribute data and value.
+///
+void DwarfDebug::addLabel(DIE *Die, unsigned Attribute, unsigned Form,
+ const DWLabel &Label) {
+ DIEValue *Value = new DIEDwarfLabel(Label);
+ DIEValues.push_back(Value);
+ Die->addValue(Attribute, Form, Value);
+}
+
+/// addObjectLabel - Add an non-Dwarf label attribute data and value.
+///
+void DwarfDebug::addObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
+ const MCSymbol *Sym) {
+ DIEValue *Value = new DIEObjectLabel(Sym);
+ DIEValues.push_back(Value);
+ Die->addValue(Attribute, Form, Value);
+}
+
+/// addSectionOffset - Add a section offset label attribute data and value.
+///
+void DwarfDebug::addSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
+ const DWLabel &Label, const DWLabel &Section,
+ bool isEH, bool useSet) {
+ DIEValue *Value = new DIESectionOffset(Label, Section, isEH, useSet);
+ DIEValues.push_back(Value);
+ Die->addValue(Attribute, Form, Value);
+}
+
+/// addDelta - Add a label delta attribute data and value.
+///
+void DwarfDebug::addDelta(DIE *Die, unsigned Attribute, unsigned Form,
+ const DWLabel &Hi, const DWLabel &Lo) {
+ DIEValue *Value = new DIEDelta(Hi, Lo);
+ DIEValues.push_back(Value);
+ Die->addValue(Attribute, Form, Value);
+}
+
+/// addBlock - Add block data.
+///
+void DwarfDebug::addBlock(DIE *Die, unsigned Attribute, unsigned Form,
+ DIEBlock *Block) {
+ Block->ComputeSize(TD);
+ DIEValues.push_back(Block);
+ Die->addValue(Attribute, Block->BestForm(), Block);
+}
+
+/// addSourceLine - Add location information to specified debug information
+/// entry.
+void DwarfDebug::addSourceLine(DIE *Die, const DIVariable *V) {
+ // If there is no compile unit specified, don't add a line #.
+ if (V->getCompileUnit().isNull())
+ return;
+
+ unsigned Line = V->getLineNumber();
+ unsigned FileID = findCompileUnit(V->getCompileUnit())->getID();
+ assert(FileID && "Invalid file id");
+ addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
+ addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
+}
+
+/// addSourceLine - Add location information to specified debug information
+/// entry.
+void DwarfDebug::addSourceLine(DIE *Die, const DIGlobal *G) {
+ // If there is no compile unit specified, don't add a line #.
+ if (G->getCompileUnit().isNull())
+ return;
+
+ unsigned Line = G->getLineNumber();
+ unsigned FileID = findCompileUnit(G->getCompileUnit())->getID();
+ assert(FileID && "Invalid file id");
+ addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
+ addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
+}
+
+/// addSourceLine - Add location information to specified debug information
+/// entry.
+void DwarfDebug::addSourceLine(DIE *Die, const DISubprogram *SP) {
+ // If there is no compile unit specified, don't add a line #.
+ if (SP->getCompileUnit().isNull())
+ return;
+ // If the line number is 0, don't add it.
+ if (SP->getLineNumber() == 0)
+ return;
+
+
+ unsigned Line = SP->getLineNumber();
+ unsigned FileID = findCompileUnit(SP->getCompileUnit())->getID();
+ assert(FileID && "Invalid file id");
+ addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
+ addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
+}
+
+/// addSourceLine - Add location information to specified debug information
+/// entry.
+void DwarfDebug::addSourceLine(DIE *Die, const DIType *Ty) {
+ // If there is no compile unit specified, don't add a line #.
+ DICompileUnit CU = Ty->getCompileUnit();
+ if (CU.isNull())
+ return;
+
+ unsigned Line = Ty->getLineNumber();
+ unsigned FileID = findCompileUnit(CU)->getID();
+ assert(FileID && "Invalid file id");
+ addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
+ addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
+}
+
+/// addSourceLine - Add location information to specified debug information
+/// entry.
+void DwarfDebug::addSourceLine(DIE *Die, const DINameSpace *NS) {
+ // If there is no compile unit specified, don't add a line #.
+ if (NS->getCompileUnit().isNull())
+ return;
+
+ unsigned Line = NS->getLineNumber();
+ StringRef FN = NS->getFilename();
+ StringRef Dir = NS->getDirectory();
+
+ unsigned FileID = GetOrCreateSourceID(Dir, FN);
+ assert(FileID && "Invalid file id");
+ addUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
+ addUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
+}
+
+/* Byref variables, in Blocks, are declared by the programmer as
+ "SomeType VarName;", but the compiler creates a
+ __Block_byref_x_VarName struct, and gives the variable VarName
+ either the struct, or a pointer to the struct, as its type. This
+ is necessary for various behind-the-scenes things the compiler
+ needs to do with by-reference variables in blocks.
+
+ However, as far as the original *programmer* is concerned, the
+ variable should still have type 'SomeType', as originally declared.
+
+ The following function dives into the __Block_byref_x_VarName
+ struct to find the original type of the variable. This will be
+ passed back to the code generating the type for the Debug
+ Information Entry for the variable 'VarName'. 'VarName' will then
+ have the original type 'SomeType' in its debug information.
+
+ The original type 'SomeType' will be the type of the field named
+ 'VarName' inside the __Block_byref_x_VarName struct.
+
+ NOTE: In order for this to not completely fail on the debugger
+ side, the Debug Information Entry for the variable VarName needs to
+ have a DW_AT_location that tells the debugger how to unwind through
+ the pointers and __Block_byref_x_VarName struct to find the actual
+ value of the variable. The function addBlockByrefType does this. */
+
+/// Find the type the programmer originally declared the variable to be
+/// and return that type.
+///
+DIType DwarfDebug::getBlockByrefType(DIType Ty, std::string Name) {
+
+ DIType subType = Ty;
+ unsigned tag = Ty.getTag();
+
+ if (tag == dwarf::DW_TAG_pointer_type) {
+ DIDerivedType DTy = DIDerivedType(Ty.getNode());
+ subType = DTy.getTypeDerivedFrom();
+ }
+
+ DICompositeType blockStruct = DICompositeType(subType.getNode());
+
+ DIArray Elements = blockStruct.getTypeArray();
+
+ if (Elements.isNull())
+ return Ty;
+
+ for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
+ DIDescriptor Element = Elements.getElement(i);
+ DIDerivedType DT = DIDerivedType(Element.getNode());
+ if (Name == DT.getName())
+ return (DT.getTypeDerivedFrom());
+ }
+
+ return Ty;
+}
+
+/// addComplexAddress - Start with the address based on the location provided,
+/// and generate the DWARF information necessary to find the actual variable
+/// given the extra address information encoded in the DIVariable, starting from
+/// the starting location. Add the DWARF information to the die.
+///
+void DwarfDebug::addComplexAddress(DbgVariable *&DV, DIE *Die,
+ unsigned Attribute,
+ const MachineLocation &Location) {
+ const DIVariable &VD = DV->getVariable();
+ DIType Ty = VD.getType();
+
+ // Decode the original location, and use that as the start of the byref
+ // variable's location.
+ unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
+ DIEBlock *Block = new DIEBlock();
+
+ if (Location.isReg()) {
+ if (Reg < 32) {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg);
+ } else {
+ Reg = Reg - dwarf::DW_OP_reg0;
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
+ addUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
+ }
+ } else {
+ if (Reg < 32)
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
+ else {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
+ addUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
+ }
+
+ addUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
+ }
+
+ for (unsigned i = 0, N = VD.getNumAddrElements(); i < N; ++i) {
+ uint64_t Element = VD.getAddrElement(i);
+
+ if (Element == DIFactory::OpPlus) {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
+ addUInt(Block, 0, dwarf::DW_FORM_udata, VD.getAddrElement(++i));
+ } else if (Element == DIFactory::OpDeref) {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
+ } else llvm_unreachable("unknown DIFactory Opcode");
+ }
+
+ // Now attach the location information to the DIE.
+ addBlock(Die, Attribute, 0, Block);
+}
+
+/* Byref variables, in Blocks, are declared by the programmer as "SomeType
+ VarName;", but the compiler creates a __Block_byref_x_VarName struct, and
+ gives the variable VarName either the struct, or a pointer to the struct, as
+ its type. This is necessary for various behind-the-scenes things the
+ compiler needs to do with by-reference variables in Blocks.
+
+ However, as far as the original *programmer* is concerned, the variable
+ should still have type 'SomeType', as originally declared.
+
+ The function getBlockByrefType dives into the __Block_byref_x_VarName
+ struct to find the original type of the variable, which is then assigned to
+ the variable's Debug Information Entry as its real type. So far, so good.
+ However now the debugger will expect the variable VarName to have the type
+ SomeType. So we need the location attribute for the variable to be an
+ expression that explains to the debugger how to navigate through the
+ pointers and struct to find the actual variable of type SomeType.
+
+ The following function does just that. We start by getting
+ the "normal" location for the variable. This will be the location
+ of either the struct __Block_byref_x_VarName or the pointer to the
+ struct __Block_byref_x_VarName.
+
+ The struct will look something like:
+
+ struct __Block_byref_x_VarName {
+ ... <various fields>
+ struct __Block_byref_x_VarName *forwarding;
+ ... <various other fields>
+ SomeType VarName;
+ ... <maybe more fields>
+ };
+
+ If we are given the struct directly (as our starting point) we
+ need to tell the debugger to:
+
+ 1). Add the offset of the forwarding field.
+
+ 2). Follow that pointer to get the real __Block_byref_x_VarName
+ struct to use (the real one may have been copied onto the heap).
+
+ 3). Add the offset for the field VarName, to find the actual variable.
+
+ If we started with a pointer to the struct, then we need to
+ dereference that pointer first, before the other steps.
+ Translating this into DWARF ops, we will need to append the following
+ to the current location description for the variable:
+
+ DW_OP_deref -- optional, if we start with a pointer
+ DW_OP_plus_uconst <forward_fld_offset>
+ DW_OP_deref
+ DW_OP_plus_uconst <varName_fld_offset>
+
+ That is what this function does. */
+
+/// addBlockByrefAddress - Start with the address based on the location
+/// provided, and generate the DWARF information necessary to find the
+/// actual Block variable (navigating the Block struct) based on the
+/// starting location. Add the DWARF information to the die. For
+/// more information, read large comment just above here.
+///
+void DwarfDebug::addBlockByrefAddress(DbgVariable *&DV, DIE *Die,
+ unsigned Attribute,
+ const MachineLocation &Location) {
+ const DIVariable &VD = DV->getVariable();
+ DIType Ty = VD.getType();
+ DIType TmpTy = Ty;
+ unsigned Tag = Ty.getTag();
+ bool isPointer = false;
+
+ StringRef varName = VD.getName();
+
+ if (Tag == dwarf::DW_TAG_pointer_type) {
+ DIDerivedType DTy = DIDerivedType(Ty.getNode());
+ TmpTy = DTy.getTypeDerivedFrom();
+ isPointer = true;
+ }
+
+ DICompositeType blockStruct = DICompositeType(TmpTy.getNode());
+
+ // Find the __forwarding field and the variable field in the __Block_byref
+ // struct.
+ DIArray Fields = blockStruct.getTypeArray();
+ DIDescriptor varField = DIDescriptor();
+ DIDescriptor forwardingField = DIDescriptor();
+
+
+ for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) {
+ DIDescriptor Element = Fields.getElement(i);
+ DIDerivedType DT = DIDerivedType(Element.getNode());
+ StringRef fieldName = DT.getName();
+ if (fieldName == "__forwarding")
+ forwardingField = Element;
+ else if (fieldName == varName)
+ varField = Element;
+ }
+
+ assert(!varField.isNull() && "Can't find byref variable in Block struct");
+ assert(!forwardingField.isNull()
+ && "Can't find forwarding field in Block struct");
+
+ // Get the offsets for the forwarding field and the variable field.
+ unsigned int forwardingFieldOffset =
+ DIDerivedType(forwardingField.getNode()).getOffsetInBits() >> 3;
+ unsigned int varFieldOffset =
+ DIDerivedType(varField.getNode()).getOffsetInBits() >> 3;
+
+ // Decode the original location, and use that as the start of the byref
+ // variable's location.
+ unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
+ DIEBlock *Block = new DIEBlock();
+
+ if (Location.isReg()) {
+ if (Reg < 32)
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg);
+ else {
+ Reg = Reg - dwarf::DW_OP_reg0;
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
+ addUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
+ }
+ } else {
+ if (Reg < 32)
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
+ else {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
+ addUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
+ }
+
+ addUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
+ }
+
+ // If we started with a pointer to the __Block_byref... struct, then
+ // the first thing we need to do is dereference the pointer (DW_OP_deref).
+ if (isPointer)
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
+
+ // Next add the offset for the '__forwarding' field:
+ // DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in
+ // adding the offset if it's 0.
+ if (forwardingFieldOffset > 0) {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
+ addUInt(Block, 0, dwarf::DW_FORM_udata, forwardingFieldOffset);
+ }
+
+ // Now dereference the __forwarding field to get to the real __Block_byref
+ // struct: DW_OP_deref.
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
+
+ // Now that we've got the real __Block_byref... struct, add the offset
+ // for the variable's field to get to the location of the actual variable:
+ // DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0.
+ if (varFieldOffset > 0) {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
+ addUInt(Block, 0, dwarf::DW_FORM_udata, varFieldOffset);
+ }
+
+ // Now attach the location information to the DIE.
+ addBlock(Die, Attribute, 0, Block);
+}
+
+/// addAddress - Add an address attribute to a die based on the location
+/// provided.
+void DwarfDebug::addAddress(DIE *Die, unsigned Attribute,
+ const MachineLocation &Location) {
+ unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
+ DIEBlock *Block = new DIEBlock();
+
+ if (Location.isReg()) {
+ if (Reg < 32) {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg);
+ } else {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
+ addUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
+ }
+ } else {
+ if (Reg < 32) {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
+ } else {
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
+ addUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
+ }
+
+ addUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
+ }
+
+ addBlock(Die, Attribute, 0, Block);
+}
+
+/// addToContextOwner - Add Die into the list of its context owner's children.
+void DwarfDebug::addToContextOwner(DIE *Die, DIDescriptor Context) {
+ if (Context.isNull())
+ ModuleCU->addDie(Die);
+ else if (Context.isType()) {
+ DIE *ContextDIE = getOrCreateTypeDIE(DIType(Context.getNode()));
+ ContextDIE->addChild(Die);
+ } else if (Context.isNameSpace()) {
+ DIE *ContextDIE = getOrCreateNameSpace(DINameSpace(Context.getNode()));
+ ContextDIE->addChild(Die);
+ } else if (DIE *ContextDIE = ModuleCU->getDIE(Context.getNode()))
+ ContextDIE->addChild(Die);
+ else
+ ModuleCU->addDie(Die);
+}
+
+/// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
+/// given DIType.
+DIE *DwarfDebug::getOrCreateTypeDIE(DIType Ty) {
+ DIE *TyDIE = ModuleCU->getDIE(Ty.getNode());
+ if (TyDIE)
+ return TyDIE;
+
+ // Create new type.
+ TyDIE = new DIE(dwarf::DW_TAG_base_type);
+ ModuleCU->insertDIE(Ty.getNode(), TyDIE);
+ if (Ty.isBasicType())
+ constructTypeDIE(*TyDIE, DIBasicType(Ty.getNode()));
+ else if (Ty.isCompositeType())
+ constructTypeDIE(*TyDIE, DICompositeType(Ty.getNode()));
+ else {
+ assert(Ty.isDerivedType() && "Unknown kind of DIType");
+ constructTypeDIE(*TyDIE, DIDerivedType(Ty.getNode()));
+ }
+
+ addToContextOwner(TyDIE, Ty.getContext());
+ return TyDIE;
+}
+
+/// addType - Add a new type attribute to the specified entity.
+void DwarfDebug::addType(DIE *Entity, DIType Ty) {
+ if (Ty.isNull())
+ return;
+
+ // Check for pre-existence.
+ DIEEntry *Entry = ModuleCU->getDIEEntry(Ty.getNode());
+ // If it exists then use the existing value.
+ if (Entry) {
+ Entity->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, Entry);
+ return;
+ }
+
+ // Set up proxy.
+ Entry = createDIEEntry();
+ ModuleCU->insertDIEEntry(Ty.getNode(), Entry);
+
+ // Construct type.
+ DIE *Buffer = getOrCreateTypeDIE(Ty);
+
+ Entry->setEntry(Buffer);
+ Entity->addValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, Entry);
+}
+
+/// constructTypeDIE - Construct basic type die from DIBasicType.
+void DwarfDebug::constructTypeDIE(DIE &Buffer, DIBasicType BTy) {
+ // Get core information.
+ StringRef Name = BTy.getName();
+ Buffer.setTag(dwarf::DW_TAG_base_type);
+ addUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
+ BTy.getEncoding());
+
+ // Add name if not anonymous or intermediate type.
+ if (!Name.empty())
+ addString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
+ uint64_t Size = BTy.getSizeInBits() >> 3;
+ addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
+}
+
+/// constructTypeDIE - Construct derived type die from DIDerivedType.
+void DwarfDebug::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
+ // Get core information.
+ StringRef Name = DTy.getName();
+ uint64_t Size = DTy.getSizeInBits() >> 3;
+ unsigned Tag = DTy.getTag();
+
+ // FIXME - Workaround for templates.
+ if (Tag == dwarf::DW_TAG_inheritance) Tag = dwarf::DW_TAG_reference_type;
+
+ Buffer.setTag(Tag);
+
+ // Map to main type, void will not have a type.
+ DIType FromTy = DTy.getTypeDerivedFrom();
+ addType(&Buffer, FromTy);
+
+ // Add name if not anonymous or intermediate type.
+ if (!Name.empty())
+ addString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
+
+ // Add size if non-zero (derived types might be zero-sized.)
+ if (Size)
+ addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
+
+ // Add source line info if available and TyDesc is not a forward declaration.
+ if (!DTy.isForwardDecl())
+ addSourceLine(&Buffer, &DTy);
+}
+
+/// constructTypeDIE - Construct type DIE from DICompositeType.
+void DwarfDebug::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
+ // Get core information.
+ StringRef Name = CTy.getName();
+
+ uint64_t Size = CTy.getSizeInBits() >> 3;
+ unsigned Tag = CTy.getTag();
+ Buffer.setTag(Tag);
+
+ switch (Tag) {
+ case dwarf::DW_TAG_vector_type:
+ case dwarf::DW_TAG_array_type:
+ constructArrayTypeDIE(Buffer, &CTy);
+ break;
+ case dwarf::DW_TAG_enumeration_type: {
+ DIArray Elements = CTy.getTypeArray();
+
+ // Add enumerators to enumeration type.
+ for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
+ DIE *ElemDie = NULL;
+ DIEnumerator Enum(Elements.getElement(i).getNode());
+ if (!Enum.isNull()) {
+ ElemDie = constructEnumTypeDIE(&Enum);
+ Buffer.addChild(ElemDie);
+ }
+ }
+ }
+ break;
+ case dwarf::DW_TAG_subroutine_type: {
+ // Add return type.
+ DIArray Elements = CTy.getTypeArray();
+ DIDescriptor RTy = Elements.getElement(0);
+ addType(&Buffer, DIType(RTy.getNode()));
+
+ // Add prototype flag.
+ addUInt(&Buffer, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
+
+ // Add arguments.
+ for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
+ DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
+ DIDescriptor Ty = Elements.getElement(i);
+ addType(Arg, DIType(Ty.getNode()));
+ Buffer.addChild(Arg);
+ }
+ }
+ break;
+ case dwarf::DW_TAG_structure_type:
+ case dwarf::DW_TAG_union_type:
+ case dwarf::DW_TAG_class_type: {
+ // Add elements to structure type.
+ DIArray Elements = CTy.getTypeArray();
+
+ // A forward struct declared type may not have elements available.
+ if (Elements.isNull())
+ break;
+
+ // Add elements to structure type.
+ for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
+ DIDescriptor Element = Elements.getElement(i);
+ if (Element.isNull())
+ continue;
+ DIE *ElemDie = NULL;
+ if (Element.getTag() == dwarf::DW_TAG_subprogram)
+ ElemDie = createSubprogramDIE(DISubprogram(Element.getNode()));
+ else if (Element.getTag() == dwarf::DW_TAG_auto_variable) {
+ DIVariable DV(Element.getNode());
+ ElemDie = new DIE(dwarf::DW_TAG_variable);
+ addString(ElemDie, dwarf::DW_AT_name, dwarf::DW_FORM_string,
+ DV.getName());
+ addType(ElemDie, DV.getType());
+ addUInt(ElemDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
+ addUInt(ElemDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
+ addSourceLine(ElemDie, &DV);
+ } else
+ ElemDie = createMemberDIE(DIDerivedType(Element.getNode()));
+ Buffer.addChild(ElemDie);
+ }
+
+ if (CTy.isAppleBlockExtension())
+ addUInt(&Buffer, dwarf::DW_AT_APPLE_block, dwarf::DW_FORM_flag, 1);
+
+ unsigned RLang = CTy.getRunTimeLang();
+ if (RLang)
+ addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class,
+ dwarf::DW_FORM_data1, RLang);
+
+ DICompositeType ContainingType = CTy.getContainingType();
+ if (!ContainingType.isNull())
+ addDIEEntry(&Buffer, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4,
+ getOrCreateTypeDIE(DIType(ContainingType.getNode())));
+ break;
+ }
+ default:
+ break;
+ }
+
+ // Add name if not anonymous or intermediate type.
+ if (!Name.empty())
+ addString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
+
+ if (Tag == dwarf::DW_TAG_enumeration_type || Tag == dwarf::DW_TAG_class_type ||
+ Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type) {
+ // Add size if non-zero (derived types might be zero-sized.)
+ if (Size)
+ addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
+ else {
+ // Add zero size if it is not a forward declaration.
+ if (CTy.isForwardDecl())
+ addUInt(&Buffer, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
+ else
+ addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, 0);
+ }
+
+ // Add source line info if available.
+ if (!CTy.isForwardDecl())
+ addSourceLine(&Buffer, &CTy);
+ }
+}
+
+/// constructSubrangeDIE - Construct subrange DIE from DISubrange.
+void DwarfDebug::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy){
+ int64_t L = SR.getLo();
+ int64_t H = SR.getHi();
+ DIE *DW_Subrange = new DIE(dwarf::DW_TAG_subrange_type);
+
+ addDIEEntry(DW_Subrange, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IndexTy);
+ if (L)
+ addSInt(DW_Subrange, dwarf::DW_AT_lower_bound, 0, L);
+ addSInt(DW_Subrange, dwarf::DW_AT_upper_bound, 0, H);
+
+ Buffer.addChild(DW_Subrange);
+}
+
+/// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
+void DwarfDebug::constructArrayTypeDIE(DIE &Buffer,
+ DICompositeType *CTy) {
+ Buffer.setTag(dwarf::DW_TAG_array_type);
+ if (CTy->getTag() == dwarf::DW_TAG_vector_type)
+ addUInt(&Buffer, dwarf::DW_AT_GNU_vector, dwarf::DW_FORM_flag, 1);
+
+ // Emit derived type.
+ addType(&Buffer, CTy->getTypeDerivedFrom());
+ DIArray Elements = CTy->getTypeArray();
+
+ // Get an anonymous type for index type.
+ DIE *IdxTy = ModuleCU->getIndexTyDie();
+ if (!IdxTy) {
+ // Construct an anonymous type for index type.
+ IdxTy = new DIE(dwarf::DW_TAG_base_type);
+ addUInt(IdxTy, dwarf::DW_AT_byte_size, 0, sizeof(int32_t));
+ addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
+ dwarf::DW_ATE_signed);
+ ModuleCU->addDie(IdxTy);
+ ModuleCU->setIndexTyDie(IdxTy);
+ }
+
+ // Add subranges to array type.
+ for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
+ DIDescriptor Element = Elements.getElement(i);
+ if (Element.getTag() == dwarf::DW_TAG_subrange_type)
+ constructSubrangeDIE(Buffer, DISubrange(Element.getNode()), IdxTy);
+ }
+}
+
+/// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
+DIE *DwarfDebug::constructEnumTypeDIE(DIEnumerator *ETy) {
+ DIE *Enumerator = new DIE(dwarf::DW_TAG_enumerator);
+ StringRef Name = ETy->getName();
+ addString(Enumerator, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
+ int64_t Value = ETy->getEnumValue();
+ addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, Value);
+ return Enumerator;
+}
+
+/// getRealLinkageName - If special LLVM prefix that is used to inform the asm
+/// printer to not emit usual symbol prefix before the symbol name is used then
+/// return linkage name after skipping this special LLVM prefix.
+static StringRef getRealLinkageName(StringRef LinkageName) {
+ char One = '\1';
+ if (LinkageName.startswith(StringRef(&One, 1)))
+ return LinkageName.substr(1);
+ return LinkageName;
+}
+
+/// createGlobalVariableDIE - Create new DIE using GV.
+DIE *DwarfDebug::createGlobalVariableDIE(const DIGlobalVariable &GV) {
+ // If the global variable was optmized out then no need to create debug info
+ // entry.
+ if (!GV.getGlobal()) return NULL;
+ if (GV.getDisplayName().empty()) return NULL;
+
+ DIE *GVDie = new DIE(dwarf::DW_TAG_variable);
+ addString(GVDie, dwarf::DW_AT_name, dwarf::DW_FORM_string,
+ GV.getDisplayName());
+
+ StringRef LinkageName = GV.getLinkageName();
+ if (!LinkageName.empty())
+ addString(GVDie, dwarf::DW_AT_MIPS_linkage_name, dwarf::DW_FORM_string,
+ getRealLinkageName(LinkageName));
+
+ addType(GVDie, GV.getType());
+ if (!GV.isLocalToUnit())
+ addUInt(GVDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
+ addSourceLine(GVDie, &GV);
+
+ return GVDie;
+}
+
+/// createMemberDIE - Create new member DIE.
+DIE *DwarfDebug::createMemberDIE(const DIDerivedType &DT) {
+ DIE *MemberDie = new DIE(DT.getTag());
+ StringRef Name = DT.getName();
+ if (!Name.empty())
+ addString(MemberDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
+
+ addType(MemberDie, DT.getTypeDerivedFrom());
+
+ addSourceLine(MemberDie, &DT);
+
+ DIEBlock *MemLocationDie = new DIEBlock();
+ addUInt(MemLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
+
+ uint64_t Size = DT.getSizeInBits();
+ uint64_t FieldSize = DT.getOriginalTypeSize();
+
+ if (Size != FieldSize) {
+ // Handle bitfield.
+ addUInt(MemberDie, dwarf::DW_AT_byte_size, 0, DT.getOriginalTypeSize()>>3);
+ addUInt(MemberDie, dwarf::DW_AT_bit_size, 0, DT.getSizeInBits());
+
+ uint64_t Offset = DT.getOffsetInBits();
+ uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
+ uint64_t HiMark = (Offset + FieldSize) & AlignMask;
+ uint64_t FieldOffset = (HiMark - FieldSize);
+ Offset -= FieldOffset;
+
+ // Maybe we need to work from the other end.
+ if (TD->isLittleEndian()) Offset = FieldSize - (Offset + Size);
+ addUInt(MemberDie, dwarf::DW_AT_bit_offset, 0, Offset);
+
+ // Here WD_AT_data_member_location points to the anonymous
+ // field that includes this bit field.
+ addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, FieldOffset >> 3);
+
+ } else
+ // This is not a bitfield.
+ addUInt(MemLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits() >> 3);
+
+ if (DT.getTag() == dwarf::DW_TAG_inheritance
+ && DT.isVirtual()) {
+
+ // For C++, virtual base classes are not at fixed offset. Use following
+ // expression to extract appropriate offset from vtable.
+ // BaseAddr = ObAddr + *((*ObAddr) - Offset)
+
+ DIEBlock *VBaseLocationDie = new DIEBlock();
+ addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
+ addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
+ addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
+ addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits());
+ addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
+ addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
+ addUInt(VBaseLocationDie, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
+
+ addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0,
+ VBaseLocationDie);
+ } else
+ addBlock(MemberDie, dwarf::DW_AT_data_member_location, 0, MemLocationDie);
+
+ if (DT.isProtected())
+ addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
+ dwarf::DW_ACCESS_protected);
+ else if (DT.isPrivate())
+ addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
+ dwarf::DW_ACCESS_private);
+ else if (DT.getTag() == dwarf::DW_TAG_inheritance)
+ addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
+ dwarf::DW_ACCESS_public);
+ if (DT.isVirtual())
+ addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_flag,
+ dwarf::DW_VIRTUALITY_virtual);
+ return MemberDie;
+}
+
+/// createSubprogramDIE - Create new DIE using SP.
+DIE *DwarfDebug::createSubprogramDIE(const DISubprogram &SP, bool MakeDecl) {
+ DIE *SPDie = ModuleCU->getDIE(SP.getNode());
+ if (SPDie)
+ return SPDie;
+
+ SPDie = new DIE(dwarf::DW_TAG_subprogram);
+ addString(SPDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, SP.getName());
+
+ StringRef LinkageName = SP.getLinkageName();
+ if (!LinkageName.empty())
+ addString(SPDie, dwarf::DW_AT_MIPS_linkage_name, dwarf::DW_FORM_string,
+ getRealLinkageName(LinkageName));
+
+ addSourceLine(SPDie, &SP);
+
+ // Add prototyped tag, if C or ObjC.
+ unsigned Lang = SP.getCompileUnit().getLanguage();
+ if (Lang == dwarf::DW_LANG_C99 || Lang == dwarf::DW_LANG_C89 ||
+ Lang == dwarf::DW_LANG_ObjC)
+ addUInt(SPDie, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
+
+ // Add Return Type.
+ DICompositeType SPTy = SP.getType();
+ DIArray Args = SPTy.getTypeArray();
+ unsigned SPTag = SPTy.getTag();
+
+ if (Args.isNull() || SPTag != dwarf::DW_TAG_subroutine_type)
+ addType(SPDie, SPTy);
+ else
+ addType(SPDie, DIType(Args.getElement(0).getNode()));
+
+ unsigned VK = SP.getVirtuality();
+ if (VK) {
+ addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_flag, VK);
+ DIEBlock *Block = new DIEBlock();
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
+ addUInt(Block, 0, dwarf::DW_FORM_data1, SP.getVirtualIndex());
+ addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, 0, Block);
+ ContainingTypeMap.insert(std::make_pair(SPDie,
+ SP.getContainingType().getNode()));
+ }
+
+ if (MakeDecl || !SP.isDefinition()) {
+ addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
+
+ // Add arguments. Do not add arguments for subprogram definition. They will
+ // be handled while processing variables.
+ DICompositeType SPTy = SP.getType();
+ DIArray Args = SPTy.getTypeArray();
+ unsigned SPTag = SPTy.getTag();
+
+ if (SPTag == dwarf::DW_TAG_subroutine_type)
+ for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
+ DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
+ DIType ATy = DIType(DIType(Args.getElement(i).getNode()));
+ addType(Arg, ATy);
+ if (ATy.isArtificial())
+ addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
+ SPDie->addChild(Arg);
+ }
+ }
+
+ if (SP.isArtificial())
+ addUInt(SPDie, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
+
+ // DW_TAG_inlined_subroutine may refer to this DIE.
+ ModuleCU->insertDIE(SP.getNode(), SPDie);
+ return SPDie;
+}
+
+/// findCompileUnit - Get the compile unit for the given descriptor.
+///
+CompileUnit *DwarfDebug::findCompileUnit(DICompileUnit Unit) {
+ DenseMap<Value *, CompileUnit *>::const_iterator I =
+ CompileUnitMap.find(Unit.getNode());
+ if (I == CompileUnitMap.end())
+ return constructCompileUnit(Unit.getNode());
+ return I->second;
+}
+
+/// getUpdatedDbgScope - Find or create DbgScope assicated with the instruction.
+/// Initialize scope and update scope hierarchy.
+DbgScope *DwarfDebug::getUpdatedDbgScope(MDNode *N, const MachineInstr *MI,
+ MDNode *InlinedAt) {
+ assert (N && "Invalid Scope encoding!");
+ assert (MI && "Missing machine instruction!");
+ bool GetConcreteScope = (MI && InlinedAt);
+
+ DbgScope *NScope = NULL;
+
+ if (InlinedAt)
+ NScope = DbgScopeMap.lookup(InlinedAt);
+ else
+ NScope = DbgScopeMap.lookup(N);
+ assert (NScope && "Unable to find working scope!");
+
+ if (NScope->getFirstInsn())
+ return NScope;
+
+ DbgScope *Parent = NULL;
+ if (GetConcreteScope) {
+ DILocation IL(InlinedAt);
+ Parent = getUpdatedDbgScope(IL.getScope().getNode(), MI,
+ IL.getOrigLocation().getNode());
+ assert (Parent && "Unable to find Parent scope!");
+ NScope->setParent(Parent);
+ Parent->addScope(NScope);
+ } else if (DIDescriptor(N).isLexicalBlock()) {
+ DILexicalBlock DB(N);
+ if (!DB.getContext().isNull()) {
+ Parent = getUpdatedDbgScope(DB.getContext().getNode(), MI, InlinedAt);
+ NScope->setParent(Parent);
+ Parent->addScope(NScope);
+ }
+ }
+
+ NScope->setFirstInsn(MI);
+
+ if (!Parent && !InlinedAt) {
+ StringRef SPName = DISubprogram(N).getLinkageName();
+ if (SPName == MF->getFunction()->getName())
+ CurrentFnDbgScope = NScope;
+ }
+
+ if (GetConcreteScope) {
+ ConcreteScopes[InlinedAt] = NScope;
+ getOrCreateAbstractScope(N);
+ }
+
+ return NScope;
+}
+
+DbgScope *DwarfDebug::getOrCreateAbstractScope(MDNode *N) {
+ assert (N && "Invalid Scope encoding!");
+
+ DbgScope *AScope = AbstractScopes.lookup(N);
+ if (AScope)
+ return AScope;
+
+ DbgScope *Parent = NULL;
+
+ DIDescriptor Scope(N);
+ if (Scope.isLexicalBlock()) {
+ DILexicalBlock DB(N);
+ DIDescriptor ParentDesc = DB.getContext();
+ if (!ParentDesc.isNull())
+ Parent = getOrCreateAbstractScope(ParentDesc.getNode());
+ }
+
+ AScope = new DbgScope(Parent, DIDescriptor(N), NULL);
+
+ if (Parent)
+ Parent->addScope(AScope);
+ AScope->setAbstractScope();
+ AbstractScopes[N] = AScope;
+ if (DIDescriptor(N).isSubprogram())
+ AbstractScopesList.push_back(AScope);
+ return AScope;
+}
+
+/// updateSubprogramScopeDIE - Find DIE for the given subprogram and
+/// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
+/// If there are global variables in this scope then create and insert
+/// DIEs for these variables.
+DIE *DwarfDebug::updateSubprogramScopeDIE(MDNode *SPNode) {
+
+ DIE *SPDie = ModuleCU->getDIE(SPNode);
+ assert (SPDie && "Unable to find subprogram DIE!");
+ DISubprogram SP(SPNode);
+ // There is not any need to generate specification DIE for a function
+ // defined at compile unit level. If a function is defined inside another
+ // function then gdb prefers the definition at top level and but does not
+ // expect specification DIE in parent function. So avoid creating
+ // specification DIE for a function defined inside a function.
+ if (SP.isDefinition() && !SP.getContext().isCompileUnit()
+ && !SP.getContext().isSubprogram()) {
+ addUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
+ // Add arguments.
+ DICompositeType SPTy = SP.getType();
+ DIArray Args = SPTy.getTypeArray();
+ unsigned SPTag = SPTy.getTag();
+ if (SPTag == dwarf::DW_TAG_subroutine_type)
+ for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
+ DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
+ DIType ATy = DIType(DIType(Args.getElement(i).getNode()));
+ addType(Arg, ATy);
+ if (ATy.isArtificial())
+ addUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
+ SPDie->addChild(Arg);
+ }
+ DIE *SPDeclDie = SPDie;
+ SPDie = new DIE(dwarf::DW_TAG_subprogram);
+ addDIEEntry(SPDie, dwarf::DW_AT_specification, dwarf::DW_FORM_ref4,
+ SPDeclDie);
+ ModuleCU->addDie(SPDie);
+ }
+
+ addLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
+ DWLabel("func_begin", SubprogramCount));
+ addLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
+ DWLabel("func_end", SubprogramCount));
+ MachineLocation Location(RI->getFrameRegister(*MF));
+ addAddress(SPDie, dwarf::DW_AT_frame_base, Location);
+
+ if (!DISubprogram(SPNode).isLocalToUnit())
+ addUInt(SPDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
+
+ return SPDie;
+}
+
+/// constructLexicalScope - Construct new DW_TAG_lexical_block
+/// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
+DIE *DwarfDebug::constructLexicalScopeDIE(DbgScope *Scope) {
+ unsigned StartID = MMI->MappedLabel(Scope->getStartLabelID());
+ unsigned EndID = MMI->MappedLabel(Scope->getEndLabelID());
+
+ // Ignore empty scopes.
+ if (StartID == EndID && StartID != 0)
+ return NULL;
+
+ DIE *ScopeDIE = new DIE(dwarf::DW_TAG_lexical_block);
+ if (Scope->isAbstractScope())
+ return ScopeDIE;
+
+ addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
+ StartID ?
+ DWLabel("label", StartID)
+ : DWLabel("func_begin", SubprogramCount));
+ addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
+ EndID ?
+ DWLabel("label", EndID)
+ : DWLabel("func_end", SubprogramCount));
+
+
+
+ return ScopeDIE;
+}
+
+/// constructInlinedScopeDIE - This scope represents inlined body of
+/// a function. Construct DIE to represent this concrete inlined copy
+/// of the function.
+DIE *DwarfDebug::constructInlinedScopeDIE(DbgScope *Scope) {
+ unsigned StartID = MMI->MappedLabel(Scope->getStartLabelID());
+ unsigned EndID = MMI->MappedLabel(Scope->getEndLabelID());
+ assert (StartID && "Invalid starting label for an inlined scope!");
+ assert (EndID && "Invalid end label for an inlined scope!");
+ // Ignore empty scopes.
+ if (StartID == EndID && StartID != 0)
+ return NULL;
+
+ DIScope DS(Scope->getScopeNode());
+ if (DS.isNull())
+ return NULL;
+ DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
+
+ DISubprogram InlinedSP = getDISubprogram(DS.getNode());
+ DIE *OriginDIE = ModuleCU->getDIE(InlinedSP.getNode());
+ assert (OriginDIE && "Unable to find Origin DIE!");
+ addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin,
+ dwarf::DW_FORM_ref4, OriginDIE);
+
+ addLabel(ScopeDIE, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
+ DWLabel("label", StartID));
+ addLabel(ScopeDIE, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
+ DWLabel("label", EndID));
+
+ InlinedSubprogramDIEs.insert(OriginDIE);
+
+ // Track the start label for this inlined function.
+ DenseMap<MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator
+ I = InlineInfo.find(InlinedSP.getNode());
+
+ if (I == InlineInfo.end()) {
+ InlineInfo[InlinedSP.getNode()].push_back(std::make_pair(StartID,
+ ScopeDIE));
+ InlinedSPNodes.push_back(InlinedSP.getNode());
+ } else
+ I->second.push_back(std::make_pair(StartID, ScopeDIE));
+
+ StringPool.insert(InlinedSP.getName());
+ StringPool.insert(getRealLinkageName(InlinedSP.getLinkageName()));
+
+ DILocation DL(Scope->getInlinedAt());
+ addUInt(ScopeDIE, dwarf::DW_AT_call_file, 0, ModuleCU->getID());
+ addUInt(ScopeDIE, dwarf::DW_AT_call_line, 0, DL.getLineNumber());
+
+ return ScopeDIE;
+}
+
+
+/// constructVariableDIE - Construct a DIE for the given DbgVariable.
+DIE *DwarfDebug::constructVariableDIE(DbgVariable *DV, DbgScope *Scope) {
+ // Get the descriptor.
+ const DIVariable &VD = DV->getVariable();
+ StringRef Name = VD.getName();
+ if (Name.empty())
+ return NULL;
+
+ // Translate tag to proper Dwarf tag. The result variable is dropped for
+ // now.
+ unsigned Tag;
+ switch (VD.getTag()) {
+ case dwarf::DW_TAG_return_variable:
+ return NULL;
+ case dwarf::DW_TAG_arg_variable:
+ Tag = dwarf::DW_TAG_formal_parameter;
+ break;
+ case dwarf::DW_TAG_auto_variable: // fall thru
+ default:
+ Tag = dwarf::DW_TAG_variable;
+ break;
+ }
+
+ // Define variable debug information entry.
+ DIE *VariableDie = new DIE(Tag);
+
+
+ DIE *AbsDIE = NULL;
+ if (DbgVariable *AV = DV->getAbstractVariable())
+ AbsDIE = AV->getDIE();
+
+ if (AbsDIE) {
+ DIScope DS(Scope->getScopeNode());
+ DISubprogram InlinedSP = getDISubprogram(DS.getNode());
+ DIE *OriginSPDIE = ModuleCU->getDIE(InlinedSP.getNode());
+ (void) OriginSPDIE;
+ assert (OriginSPDIE && "Unable to find Origin DIE for the SP!");
+ DIE *AbsDIE = DV->getAbstractVariable()->getDIE();
+ assert (AbsDIE && "Unable to find Origin DIE for the Variable!");
+ addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin,
+ dwarf::DW_FORM_ref4, AbsDIE);
+ }
+ else {
+ addString(VariableDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
+ addSourceLine(VariableDie, &VD);
+
+ // Add variable type.
+ // FIXME: isBlockByrefVariable should be reformulated in terms of complex
+ // addresses instead.
+ if (VD.isBlockByrefVariable())
+ addType(VariableDie, getBlockByrefType(VD.getType(), Name));
+ else
+ addType(VariableDie, VD.getType());
+ }
+
+ // Add variable address.
+ if (!Scope->isAbstractScope()) {
+ MachineLocation Location;
+ unsigned FrameReg;
+ int Offset = RI->getFrameIndexReference(*MF, DV->getFrameIndex(), FrameReg);
+ Location.set(FrameReg, Offset);
+
+ if (VD.hasComplexAddress())
+ addComplexAddress(DV, VariableDie, dwarf::DW_AT_location, Location);
+ else if (VD.isBlockByrefVariable())
+ addBlockByrefAddress(DV, VariableDie, dwarf::DW_AT_location, Location);
+ else
+ addAddress(VariableDie, dwarf::DW_AT_location, Location);
+ }
+
+ if (Tag == dwarf::DW_TAG_formal_parameter && VD.getType().isArtificial())
+ addUInt(VariableDie, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1);
+ DV->setDIE(VariableDie);
+ return VariableDie;
+
+}
+
+void DwarfDebug::addPubTypes(DISubprogram SP) {
+ DICompositeType SPTy = SP.getType();
+ unsigned SPTag = SPTy.getTag();
+ if (SPTag != dwarf::DW_TAG_subroutine_type)
+ return;
+
+ DIArray Args = SPTy.getTypeArray();
+ if (Args.isNull())
+ return;
+
+ for (unsigned i = 0, e = Args.getNumElements(); i != e; ++i) {
+ DIType ATy(Args.getElement(i).getNode());
+ if (ATy.isNull())
+ continue;
+ DICompositeType CATy = getDICompositeType(ATy);
+ if (!CATy.isNull() && !CATy.getName().empty()) {
+ if (DIEEntry *Entry = ModuleCU->getDIEEntry(CATy.getNode()))
+ ModuleCU->addGlobalType(CATy.getName(), Entry->getEntry());
+ }
+ }
+}
+
+/// constructScopeDIE - Construct a DIE for this scope.
+DIE *DwarfDebug::constructScopeDIE(DbgScope *Scope) {
+ if (!Scope)
+ return NULL;
+ DIScope DS(Scope->getScopeNode());
+ if (DS.isNull())
+ return NULL;
+
+ DIE *ScopeDIE = NULL;
+ if (Scope->getInlinedAt())
+ ScopeDIE = constructInlinedScopeDIE(Scope);
+ else if (DS.isSubprogram()) {
+ if (Scope->isAbstractScope())
+ ScopeDIE = ModuleCU->getDIE(DS.getNode());
+ else
+ ScopeDIE = updateSubprogramScopeDIE(DS.getNode());
+ }
+ else {
+ ScopeDIE = constructLexicalScopeDIE(Scope);
+ if (!ScopeDIE) return NULL;
+ }
+
+ // Add variables to scope.
+ SmallVector<DbgVariable *, 8> &Variables = Scope->getVariables();
+ for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
+ DIE *VariableDIE = constructVariableDIE(Variables[i], Scope);
+ if (VariableDIE)
+ ScopeDIE->addChild(VariableDIE);
+ }
+
+ // Add nested scopes.
+ SmallVector<DbgScope *, 4> &Scopes = Scope->getScopes();
+ for (unsigned j = 0, M = Scopes.size(); j < M; ++j) {
+ // Define the Scope debug information entry.
+ DIE *NestedDIE = constructScopeDIE(Scopes[j]);
+ if (NestedDIE)
+ ScopeDIE->addChild(NestedDIE);
+ }
+
+ if (DS.isSubprogram())
+ addPubTypes(DISubprogram(DS.getNode()));
+
+ return ScopeDIE;
+}
+
+/// GetOrCreateSourceID - Look up the source id with the given directory and
+/// source file names. If none currently exists, create a new id and insert it
+/// in the SourceIds map. This can update DirectoryNames and SourceFileNames
+/// maps as well.
+unsigned DwarfDebug::GetOrCreateSourceID(StringRef DirName, StringRef FileName) {
+ unsigned DId;
+ StringMap<unsigned>::iterator DI = DirectoryIdMap.find(DirName);
+ if (DI != DirectoryIdMap.end()) {
+ DId = DI->getValue();
+ } else {
+ DId = DirectoryNames.size() + 1;
+ DirectoryIdMap[DirName] = DId;
+ DirectoryNames.push_back(DirName);
+ }
+
+ unsigned FId;
+ StringMap<unsigned>::iterator FI = SourceFileIdMap.find(FileName);
+ if (FI != SourceFileIdMap.end()) {
+ FId = FI->getValue();
+ } else {
+ FId = SourceFileNames.size() + 1;
+ SourceFileIdMap[FileName] = FId;
+ SourceFileNames.push_back(FileName);
+ }
+
+ DenseMap<std::pair<unsigned, unsigned>, unsigned>::iterator SI =
+ SourceIdMap.find(std::make_pair(DId, FId));
+ if (SI != SourceIdMap.end())
+ return SI->second;
+
+ unsigned SrcId = SourceIds.size() + 1; // DW_AT_decl_file cannot be 0.
+ SourceIdMap[std::make_pair(DId, FId)] = SrcId;
+ SourceIds.push_back(std::make_pair(DId, FId));
+
+ return SrcId;
+}
+
+/// getOrCreateNameSpace - Create a DIE for DINameSpace.
+DIE *DwarfDebug::getOrCreateNameSpace(DINameSpace NS) {
+ DIE *NDie = ModuleCU->getDIE(NS.getNode());
+ if (NDie)
+ return NDie;
+ NDie = new DIE(dwarf::DW_TAG_namespace);
+ ModuleCU->insertDIE(NS.getNode(), NDie);
+ if (!NS.getName().empty())
+ addString(NDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, NS.getName());
+ addSourceLine(NDie, &NS);
+ addToContextOwner(NDie, NS.getContext());
+ return NDie;
+}
+
+CompileUnit *DwarfDebug::constructCompileUnit(MDNode *N) {
+ DICompileUnit DIUnit(N);
+ StringRef FN = DIUnit.getFilename();
+ StringRef Dir = DIUnit.getDirectory();
+ unsigned ID = GetOrCreateSourceID(Dir, FN);
+
+ DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
+ addSectionOffset(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
+ DWLabel("section_line", 0), DWLabel("section_line", 0),
+ false);
+ addString(Die, dwarf::DW_AT_producer, dwarf::DW_FORM_string,
+ DIUnit.getProducer());
+ addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data1,
+ DIUnit.getLanguage());
+ addString(Die, dwarf::DW_AT_name, dwarf::DW_FORM_string, FN);
+
+ if (!Dir.empty())
+ addString(Die, dwarf::DW_AT_comp_dir, dwarf::DW_FORM_string, Dir);
+ if (DIUnit.isOptimized())
+ addUInt(Die, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
+
+ StringRef Flags = DIUnit.getFlags();
+ if (!Flags.empty())
+ addString(Die, dwarf::DW_AT_APPLE_flags, dwarf::DW_FORM_string, Flags);
+
+ unsigned RVer = DIUnit.getRunTimeVersion();
+ if (RVer)
+ addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
+ dwarf::DW_FORM_data1, RVer);
+
+ CompileUnit *Unit = new CompileUnit(ID, Die);
+ if (!ModuleCU && DIUnit.isMain()) {
+ // Use first compile unit marked as isMain as the compile unit
+ // for this module.
+ ModuleCU = Unit;
+ }
+
+ CompileUnitMap[DIUnit.getNode()] = Unit;
+ CompileUnits.push_back(Unit);
+ return Unit;
+}
+
+void DwarfDebug::constructGlobalVariableDIE(MDNode *N) {
+ DIGlobalVariable DI_GV(N);
+
+ // If debug information is malformed then ignore it.
+ if (DI_GV.Verify() == false)
+ return;
+
+ // Check for pre-existence.
+ if (ModuleCU->getDIE(DI_GV.getNode()))
+ return;
+
+ DIE *VariableDie = createGlobalVariableDIE(DI_GV);
+ if (!VariableDie)
+ return;
+
+ // Add to map.
+ ModuleCU->insertDIE(N, VariableDie);
+
+ // Add to context owner.
+ DIDescriptor GVContext = DI_GV.getContext();
+ // Do not create specification DIE if context is either compile unit
+ // or a subprogram.
+ if (DI_GV.isDefinition() && !GVContext.isCompileUnit()
+ && !GVContext.isSubprogram()) {
+ // Create specification DIE.
+ DIE *VariableSpecDIE = new DIE(dwarf::DW_TAG_variable);
+ addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification,
+ dwarf::DW_FORM_ref4, VariableDie);
+ DIEBlock *Block = new DIEBlock();
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
+ addObjectLabel(Block, 0, dwarf::DW_FORM_udata,
+ Asm->GetGlobalValueSymbol(DI_GV.getGlobal()));
+ addBlock(VariableSpecDIE, dwarf::DW_AT_location, 0, Block);
+ addUInt(VariableDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
+ ModuleCU->addDie(VariableSpecDIE);
+ } else {
+ DIEBlock *Block = new DIEBlock();
+ addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
+ addObjectLabel(Block, 0, dwarf::DW_FORM_udata,
+ Asm->GetGlobalValueSymbol(DI_GV.getGlobal()));
+ addBlock(VariableDie, dwarf::DW_AT_location, 0, Block);
+ }
+ addToContextOwner(VariableDie, GVContext);
+
+ // Expose as global. FIXME - need to check external flag.
+ ModuleCU->addGlobal(DI_GV.getName(), VariableDie);
+
+ DIType GTy = DI_GV.getType();
+ if (GTy.isCompositeType() && !GTy.getName().empty()) {
+ DIEEntry *Entry = ModuleCU->getDIEEntry(GTy.getNode());
+ assert (Entry && "Missing global type!");
+ ModuleCU->addGlobalType(GTy.getName(), Entry->getEntry());
+ }
+ return;
+}
+
+void DwarfDebug::constructSubprogramDIE(MDNode *N) {
+ DISubprogram SP(N);
+
+ // Check for pre-existence.
+ if (ModuleCU->getDIE(N))
+ return;
+
+ if (!SP.isDefinition())
+ // This is a method declaration which will be handled while constructing
+ // class type.
+ return;
+
+ DIE *SubprogramDie = createSubprogramDIE(SP);
+
+ // Add to map.
+ ModuleCU->insertDIE(N, SubprogramDie);
+
+ // Add to context owner.
+ addToContextOwner(SubprogramDie, SP.getContext());
+
+ // Expose as global.
+ ModuleCU->addGlobal(SP.getName(), SubprogramDie);
+
+ return;
+}
+
+/// beginModule - Emit all Dwarf sections that should come prior to the
+/// content. Create global DIEs and emit initial debug info sections.
+/// This is inovked by the target AsmPrinter.
+void DwarfDebug::beginModule(Module *M, MachineModuleInfo *mmi) {
+ this->M = M;
+
+ if (TimePassesIsEnabled)
+ DebugTimer->startTimer();
+
+ if (!MAI->doesSupportDebugInformation())
+ return;
+
+ DebugInfoFinder DbgFinder;
+ DbgFinder.processModule(*M);
+
+ // Create all the compile unit DIEs.
+ for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
+ E = DbgFinder.compile_unit_end(); I != E; ++I)
+ constructCompileUnit(*I);
+
+ if (CompileUnits.empty()) {
+ if (TimePassesIsEnabled)
+ DebugTimer->stopTimer();
+
+ return;
+ }
+
+ // If main compile unit for this module is not seen than randomly
+ // select first compile unit.
+ if (!ModuleCU)
+ ModuleCU = CompileUnits[0];
+
+ // Create DIEs for each subprogram.
+ for (DebugInfoFinder::iterator I = DbgFinder.subprogram_begin(),
+ E = DbgFinder.subprogram_end(); I != E; ++I)
+ constructSubprogramDIE(*I);
+
+ // Create DIEs for each global variable.
+ for (DebugInfoFinder::iterator I = DbgFinder.global_variable_begin(),
+ E = DbgFinder.global_variable_end(); I != E; ++I)
+ constructGlobalVariableDIE(*I);
+
+ MMI = mmi;
+ shouldEmit = true;
+ MMI->setDebugInfoAvailability(true);
+
+ // Prime section data.
+ SectionMap.insert(Asm->getObjFileLowering().getTextSection());
+
+ // Print out .file directives to specify files for .loc directives. These are
+ // printed out early so that they precede any .loc directives.
+ if (MAI->hasDotLocAndDotFile()) {
+ for (unsigned i = 1, e = getNumSourceIds()+1; i != e; ++i) {
+ // Remember source id starts at 1.
+ std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(i);
+ // FIXME: don't use sys::path for this! This should not depend on the
+ // host.
+ sys::Path FullPath(getSourceDirectoryName(Id.first));
+ bool AppendOk =
+ FullPath.appendComponent(getSourceFileName(Id.second));
+ assert(AppendOk && "Could not append filename to directory!");
+ AppendOk = false;
+ Asm->OutStreamer.EmitDwarfFileDirective(i, FullPath.str());
+ }
+ }
+
+ // Emit initial sections
+ emitInitial();
+
+ if (TimePassesIsEnabled)
+ DebugTimer->stopTimer();
+}
+
+/// endModule - Emit all Dwarf sections that should come after the content.
+///
+void DwarfDebug::endModule() {
+ if (!ModuleCU)
+ return;
+
+ if (TimePassesIsEnabled)
+ DebugTimer->startTimer();
+
+ // Attach DW_AT_inline attribute with inlined subprogram DIEs.
+ for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),
+ AE = InlinedSubprogramDIEs.end(); AI != AE; ++AI) {
+ DIE *ISP = *AI;
+ addUInt(ISP, dwarf::DW_AT_inline, 0, dwarf::DW_INL_inlined);
+ }
+
+ // Insert top level DIEs.
+ for (SmallVector<DIE *, 4>::iterator TI = TopLevelDIEsVector.begin(),
+ TE = TopLevelDIEsVector.end(); TI != TE; ++TI)
+ ModuleCU->getCUDie()->addChild(*TI);
+
+ for (DenseMap<DIE *, MDNode *>::iterator CI = ContainingTypeMap.begin(),
+ CE = ContainingTypeMap.end(); CI != CE; ++CI) {
+ DIE *SPDie = CI->first;
+ MDNode *N = dyn_cast_or_null<MDNode>(CI->second);
+ if (!N) continue;
+ DIE *NDie = ModuleCU->getDIE(N);
+ if (!NDie) continue;
+ addDIEEntry(SPDie, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4, NDie);
+ // FIXME - This is not the correct approach.
+ // addDIEEntry(NDie, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4, NDie);
+ }
+
+ // Standard sections final addresses.
+ Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getTextSection());
+ EmitLabel("text_end", 0);
+ Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getDataSection());
+ EmitLabel("data_end", 0);
+
+ // End text sections.
+ for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) {
+ Asm->OutStreamer.SwitchSection(SectionMap[i]);
+ EmitLabel("section_end", i);
+ }
+
+ // Emit common frame information.
+ emitCommonDebugFrame();
+
+ // Emit function debug frame information
+ for (std::vector<FunctionDebugFrameInfo>::iterator I = DebugFrames.begin(),
+ E = DebugFrames.end(); I != E; ++I)
+ emitFunctionDebugFrame(*I);
+
+ // Compute DIE offsets and sizes.
+ computeSizeAndOffsets();
+
+ // Emit all the DIEs into a debug info section
+ emitDebugInfo();
+
+ // Corresponding abbreviations into a abbrev section.
+ emitAbbreviations();
+
+ // Emit source line correspondence into a debug line section.
+ emitDebugLines();
+
+ // Emit info into a debug pubnames section.
+ emitDebugPubNames();
+
+ // Emit info into a debug pubtypes section.
+ emitDebugPubTypes();
+
+ // Emit info into a debug str section.
+ emitDebugStr();
+
+ // Emit info into a debug loc section.
+ emitDebugLoc();
+
+ // Emit info into a debug aranges section.
+ EmitDebugARanges();
+
+ // Emit info into a debug ranges section.
+ emitDebugRanges();
+
+ // Emit info into a debug macinfo section.
+ emitDebugMacInfo();
+
+ // Emit inline info.
+ emitDebugInlineInfo();
+
+ if (TimePassesIsEnabled)
+ DebugTimer->stopTimer();
+}
+
+/// findAbstractVariable - Find abstract variable, if any, associated with Var.
+DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &Var,
+ unsigned FrameIdx,
+ DILocation &ScopeLoc) {
+
+ DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var.getNode());
+ if (AbsDbgVariable)
+ return AbsDbgVariable;
+
+ DbgScope *Scope = AbstractScopes.lookup(ScopeLoc.getScope().getNode());
+ if (!Scope)
+ return NULL;
+
+ AbsDbgVariable = new DbgVariable(Var, FrameIdx);
+ Scope->addVariable(AbsDbgVariable);
+ AbstractVariables[Var.getNode()] = AbsDbgVariable;
+ return AbsDbgVariable;
+}
+
+/// collectVariableInfo - Populate DbgScope entries with variables' info.
+void DwarfDebug::collectVariableInfo() {
+ if (!MMI) return;
+
+ MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
+ for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
+ VE = VMap.end(); VI != VE; ++VI) {
+ MDNode *Var = VI->first;
+ if (!Var) continue;
+ DIVariable DV (Var);
+ std::pair< unsigned, MDNode *> VP = VI->second;
+ DILocation ScopeLoc(VP.second);
+
+ DbgScope *Scope =
+ ConcreteScopes.lookup(ScopeLoc.getOrigLocation().getNode());
+ if (!Scope)
+ Scope = DbgScopeMap.lookup(ScopeLoc.getScope().getNode());
+ // If variable scope is not found then skip this variable.
+ if (!Scope)
+ continue;
+
+ DbgVariable *RegVar = new DbgVariable(DV, VP.first);
+ Scope->addVariable(RegVar);
+ if (DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.first,
+ ScopeLoc))
+ RegVar->setAbstractVariable(AbsDbgVariable);
+ }
+}
+
+/// beginScope - Process beginning of a scope starting at Label.
+void DwarfDebug::beginScope(const MachineInstr *MI, unsigned Label) {
+ InsnToDbgScopeMapTy::iterator I = DbgScopeBeginMap.find(MI);
+ if (I == DbgScopeBeginMap.end())
+ return;
+ ScopeVector &SD = I->second;
+ for (ScopeVector::iterator SDI = SD.begin(), SDE = SD.end();
+ SDI != SDE; ++SDI)
+ (*SDI)->setStartLabelID(Label);
+}
+
+/// endScope - Process end of a scope.
+void DwarfDebug::endScope(const MachineInstr *MI) {
+ InsnToDbgScopeMapTy::iterator I = DbgScopeEndMap.find(MI);
+ if (I == DbgScopeEndMap.end())
+ return;
+
+ unsigned Label = MMI->NextLabelID();
+ Asm->printLabel(Label);
+ O << '\n';
+
+ SmallVector<DbgScope *, 2> &SD = I->second;
+ for (SmallVector<DbgScope *, 2>::iterator SDI = SD.begin(), SDE = SD.end();
+ SDI != SDE; ++SDI)
+ (*SDI)->setEndLabelID(Label);
+ return;
+}
+
+/// createDbgScope - Create DbgScope for the scope.
+void DwarfDebug::createDbgScope(MDNode *Scope, MDNode *InlinedAt) {
+
+ if (!InlinedAt) {
+ DbgScope *WScope = DbgScopeMap.lookup(Scope);
+ if (WScope)
+ return;
+ WScope = new DbgScope(NULL, DIDescriptor(Scope), NULL);
+ DbgScopeMap.insert(std::make_pair(Scope, WScope));
+ if (DIDescriptor(Scope).isLexicalBlock())
+ createDbgScope(DILexicalBlock(Scope).getContext().getNode(), NULL);
+ return;
+ }
+
+ DbgScope *WScope = DbgScopeMap.lookup(InlinedAt);
+ if (WScope)
+ return;
+
+ WScope = new DbgScope(NULL, DIDescriptor(Scope), InlinedAt);
+ DbgScopeMap.insert(std::make_pair(InlinedAt, WScope));
+ DILocation DL(InlinedAt);
+ createDbgScope(DL.getScope().getNode(), DL.getOrigLocation().getNode());
+}
+
+/// extractScopeInformation - Scan machine instructions in this function
+/// and collect DbgScopes. Return true, if atleast one scope was found.
+bool DwarfDebug::extractScopeInformation() {
+ // If scope information was extracted using .dbg intrinsics then there is not
+ // any need to extract these information by scanning each instruction.
+ if (!DbgScopeMap.empty())
+ return false;
+
+ DenseMap<const MachineInstr *, unsigned> MIIndexMap;
+ unsigned MIIndex = 0;
+ // Scan each instruction and create scopes. First build working set of scopes.
+ for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
+ I != E; ++I) {
+ for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
+ II != IE; ++II) {
+ const MachineInstr *MInsn = II;
+ MIIndexMap[MInsn] = MIIndex++;
+ DebugLoc DL = MInsn->getDebugLoc();
+ if (DL.isUnknown()) continue;
+ DILocation DLT = MF->getDILocation(DL);
+ DIScope DLTScope = DLT.getScope();
+ if (DLTScope.isNull()) continue;
+ // There is no need to create another DIE for compile unit. For all
+ // other scopes, create one DbgScope now. This will be translated
+ // into a scope DIE at the end.
+ if (DLTScope.isCompileUnit()) continue;
+ createDbgScope(DLTScope.getNode(), DLT.getOrigLocation().getNode());
+ }
+ }
+
+
+ // Build scope hierarchy using working set of scopes.
+ for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
+ I != E; ++I) {
+ for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
+ II != IE; ++II) {
+ const MachineInstr *MInsn = II;
+ DebugLoc DL = MInsn->getDebugLoc();
+ if (DL.isUnknown()) continue;
+ DILocation DLT = MF->getDILocation(DL);
+ DIScope DLTScope = DLT.getScope();
+ if (DLTScope.isNull()) continue;
+ // There is no need to create another DIE for compile unit. For all
+ // other scopes, create one DbgScope now. This will be translated
+ // into a scope DIE at the end.
+ if (DLTScope.isCompileUnit()) continue;
+ DbgScope *Scope = getUpdatedDbgScope(DLTScope.getNode(), MInsn,
+ DLT.getOrigLocation().getNode());
+ Scope->setLastInsn(MInsn);
+ }
+ }
+
+ if (!CurrentFnDbgScope)
+ return false;
+
+ CurrentFnDbgScope->fixInstructionMarkers(MIIndexMap);
+
+ // Each scope has first instruction and last instruction to mark beginning
+ // and end of a scope respectively. Create an inverse map that list scopes
+ // starts (and ends) with an instruction. One instruction may start (or end)
+ // multiple scopes. Ignore scopes that are not reachable.
+ SmallVector<DbgScope *, 4> WorkList;
+ WorkList.push_back(CurrentFnDbgScope);
+ while (!WorkList.empty()) {
+ DbgScope *S = WorkList.back(); WorkList.pop_back();
+
+ SmallVector<DbgScope *, 4> &Children = S->getScopes();
+ if (!Children.empty())
+ for (SmallVector<DbgScope *, 4>::iterator SI = Children.begin(),
+ SE = Children.end(); SI != SE; ++SI)
+ WorkList.push_back(*SI);
+
+ if (S->isAbstractScope())
+ continue;
+ const MachineInstr *MI = S->getFirstInsn();
+ assert (MI && "DbgScope does not have first instruction!");
+
+ InsnToDbgScopeMapTy::iterator IDI = DbgScopeBeginMap.find(MI);
+ if (IDI != DbgScopeBeginMap.end())
+ IDI->second.push_back(S);
+ else
+ DbgScopeBeginMap[MI].push_back(S);
+
+ MI = S->getLastInsn();
+ assert (MI && "DbgScope does not have last instruction!");
+ IDI = DbgScopeEndMap.find(MI);
+ if (IDI != DbgScopeEndMap.end())
+ IDI->second.push_back(S);
+ else
+ DbgScopeEndMap[MI].push_back(S);
+ }
+
+ return !DbgScopeMap.empty();
+}
+
+/// beginFunction - Gather pre-function debug information. Assumes being
+/// emitted immediately after the function entry point.
+void DwarfDebug::beginFunction(const MachineFunction *MF) {
+ this->MF = MF;
+
+ if (!ShouldEmitDwarfDebug()) return;
+
+ if (TimePassesIsEnabled)
+ DebugTimer->startTimer();
+
+ if (!extractScopeInformation())
+ return;
+
+ collectVariableInfo();
+
+ // Assumes in correct section after the entry point.
+ EmitLabel("func_begin", ++SubprogramCount);
+
+ // Emit label for the implicitly defined dbg.stoppoint at the start of the
+ // function.
+ DebugLoc FDL = MF->getDefaultDebugLoc();
+ if (!FDL.isUnknown()) {
+ DILocation DLT = MF->getDILocation(FDL);
+ unsigned LabelID = 0;
+ DISubprogram SP = getDISubprogram(DLT.getScope().getNode());
+ if (!SP.isNull())
+ LabelID = recordSourceLine(SP.getLineNumber(), 0,
+ DLT.getScope().getNode());
+ else
+ LabelID = recordSourceLine(DLT.getLineNumber(),
+ DLT.getColumnNumber(),
+ DLT.getScope().getNode());
+ Asm->printLabel(LabelID);
+ O << '\n';
+ }
+ if (TimePassesIsEnabled)
+ DebugTimer->stopTimer();
+}
+
+/// endFunction - Gather and emit post-function debug information.
+///
+void DwarfDebug::endFunction(const MachineFunction *MF) {
+ if (!ShouldEmitDwarfDebug()) return;
+
+ if (TimePassesIsEnabled)
+ DebugTimer->startTimer();
+
+ if (DbgScopeMap.empty())
+ return;
+
+ if (CurrentFnDbgScope) {
+ // Define end label for subprogram.
+ EmitLabel("func_end", SubprogramCount);
+
+ // Get function line info.
+ if (!Lines.empty()) {
+ // Get section line info.
+ unsigned ID = SectionMap.insert(Asm->getCurrentSection());
+ if (SectionSourceLines.size() < ID) SectionSourceLines.resize(ID);
+ std::vector<SrcLineInfo> &SectionLineInfos = SectionSourceLines[ID-1];
+ // Append the function info to section info.
+ SectionLineInfos.insert(SectionLineInfos.end(),
+ Lines.begin(), Lines.end());
+ }
+
+ // Construct abstract scopes.
+ for (SmallVector<DbgScope *, 4>::iterator AI = AbstractScopesList.begin(),
+ AE = AbstractScopesList.end(); AI != AE; ++AI)
+ constructScopeDIE(*AI);
+
+ constructScopeDIE(CurrentFnDbgScope);
+
+ DebugFrames.push_back(FunctionDebugFrameInfo(SubprogramCount,
+ MMI->getFrameMoves()));
+ }
+
+ // Clear debug info
+ CurrentFnDbgScope = NULL;
+ DbgScopeMap.clear();
+ DbgScopeBeginMap.clear();
+ DbgScopeEndMap.clear();
+ ConcreteScopes.clear();
+ AbstractScopesList.clear();
+ Lines.clear();
+
+ if (TimePassesIsEnabled)
+ DebugTimer->stopTimer();
+}
+
+/// recordSourceLine - Records location information and associates it with a
+/// label. Returns a unique label ID used to generate a label and provide
+/// correspondence to the source line list.
+unsigned DwarfDebug::recordSourceLine(unsigned Line, unsigned Col,
+ MDNode *S) {
+ if (!MMI)
+ return 0;
+
+ if (TimePassesIsEnabled)
+ DebugTimer->startTimer();
+
+ StringRef Dir;
+ StringRef Fn;
+
+ DIDescriptor Scope(S);
+ if (Scope.isCompileUnit()) {
+ DICompileUnit CU(S);
+ Dir = CU.getDirectory();
+ Fn = CU.getFilename();
+ } else if (Scope.isSubprogram()) {
+ DISubprogram SP(S);
+ Dir = SP.getDirectory();
+ Fn = SP.getFilename();
+ } else if (Scope.isLexicalBlock()) {
+ DILexicalBlock DB(S);
+ Dir = DB.getDirectory();
+ Fn = DB.getFilename();
+ } else
+ assert (0 && "Unexpected scope info");
+
+ unsigned Src = GetOrCreateSourceID(Dir, Fn);
+ unsigned ID = MMI->NextLabelID();
+ Lines.push_back(SrcLineInfo(Line, Col, Src, ID));
+
+ if (TimePassesIsEnabled)
+ DebugTimer->stopTimer();
+
+ return ID;
+}
+
+/// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
+/// timed. Look up the source id with the given directory and source file
+/// names. If none currently exists, create a new id and insert it in the
+/// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
+/// well.
+unsigned DwarfDebug::getOrCreateSourceID(const std::string &DirName,
+ const std::string &FileName) {
+ if (TimePassesIsEnabled)
+ DebugTimer->startTimer();
+
+ unsigned SrcId = GetOrCreateSourceID(DirName.c_str(), FileName.c_str());
+
+ if (TimePassesIsEnabled)
+ DebugTimer->stopTimer();
+
+ return SrcId;
+}
+
+//===----------------------------------------------------------------------===//
+// Emit Methods
+//===----------------------------------------------------------------------===//
+
+/// computeSizeAndOffset - Compute the size and offset of a DIE.
+///
+unsigned
+DwarfDebug::computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last) {
+ // Get the children.
+ const std::vector<DIE *> &Children = Die->getChildren();
+
+ // If not last sibling and has children then add sibling offset attribute.
+ if (!Last && !Children.empty()) Die->addSiblingOffset();
+
+ // Record the abbreviation.
+ assignAbbrevNumber(Die->getAbbrev());
+
+ // Get the abbreviation for this DIE.
+ unsigned AbbrevNumber = Die->getAbbrevNumber();
+ const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
+
+ // Set DIE offset
+ Die->setOffset(Offset);
+
+ // Start the size with the size of abbreviation code.
+ Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
+
+ const SmallVector<DIEValue*, 32> &Values = Die->getValues();
+ const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
+
+ // Size the DIE attribute values.
+ for (unsigned i = 0, N = Values.size(); i < N; ++i)
+ // Size attribute value.
+ Offset += Values[i]->SizeOf(TD, AbbrevData[i].getForm());
+
+ // Size the DIE children if any.
+ if (!Children.empty()) {
+ assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
+ "Children flag not set");
+
+ for (unsigned j = 0, M = Children.size(); j < M; ++j)
+ Offset = computeSizeAndOffset(Children[j], Offset, (j + 1) == M);
+
+ // End of children marker.
+ Offset += sizeof(int8_t);
+ }
+
+ Die->setSize(Offset - Die->getOffset());
+ return Offset;
+}
+
+/// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
+///
+void DwarfDebug::computeSizeAndOffsets() {
+ // Compute size of compile unit header.
+ static unsigned Offset =
+ sizeof(int32_t) + // Length of Compilation Unit Info
+ sizeof(int16_t) + // DWARF version number
+ sizeof(int32_t) + // Offset Into Abbrev. Section
+ sizeof(int8_t); // Pointer Size (in bytes)
+
+ computeSizeAndOffset(ModuleCU->getCUDie(), Offset, true);
+ CompileUnitOffsets[ModuleCU] = 0;
+}
+
+/// emitInitial - Emit initial Dwarf declarations. This is necessary for cc
+/// tools to recognize the object file contains Dwarf information.
+void DwarfDebug::emitInitial() {
+ // Check to see if we already emitted intial headers.
+ if (didInitial) return;
+ didInitial = true;
+
+ const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+
+ // Dwarf sections base addresses.
+ if (MAI->doesDwarfRequireFrameSection()) {
+ Asm->OutStreamer.SwitchSection(TLOF.getDwarfFrameSection());
+ EmitLabel("section_debug_frame", 0);
+ }
+
+ Asm->OutStreamer.SwitchSection(TLOF.getDwarfInfoSection());
+ EmitLabel("section_info", 0);
+ Asm->OutStreamer.SwitchSection(TLOF.getDwarfAbbrevSection());
+ EmitLabel("section_abbrev", 0);
+ Asm->OutStreamer.SwitchSection(TLOF.getDwarfARangesSection());
+ EmitLabel("section_aranges", 0);
+
+ if (const MCSection *LineInfoDirective = TLOF.getDwarfMacroInfoSection()) {
+ Asm->OutStreamer.SwitchSection(LineInfoDirective);
+ EmitLabel("section_macinfo", 0);
+ }
+
+ Asm->OutStreamer.SwitchSection(TLOF.getDwarfLineSection());
+ EmitLabel("section_line", 0);
+ Asm->OutStreamer.SwitchSection(TLOF.getDwarfLocSection());
+ EmitLabel("section_loc", 0);
+ Asm->OutStreamer.SwitchSection(TLOF.getDwarfPubNamesSection());
+ EmitLabel("section_pubnames", 0);
+ Asm->OutStreamer.SwitchSection(TLOF.getDwarfPubTypesSection());
+ EmitLabel("section_pubtypes", 0);
+ Asm->OutStreamer.SwitchSection(TLOF.getDwarfStrSection());
+ EmitLabel("section_str", 0);
+ Asm->OutStreamer.SwitchSection(TLOF.getDwarfRangesSection());
+ EmitLabel("section_ranges", 0);
+
+ Asm->OutStreamer.SwitchSection(TLOF.getTextSection());
+ EmitLabel("text_begin", 0);
+ Asm->OutStreamer.SwitchSection(TLOF.getDataSection());
+ EmitLabel("data_begin", 0);
+}
+
+/// emitDIE - Recusively Emits a debug information entry.
+///
+void DwarfDebug::emitDIE(DIE *Die) {
+ // Get the abbreviation for this DIE.
+ unsigned AbbrevNumber = Die->getAbbrevNumber();
+ const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
+
+ Asm->O << '\n';
+
+ // Emit the code (index) for the abbreviation.
+ if (Asm->VerboseAsm)
+ Asm->OutStreamer.AddComment("Abbrev [" + Twine(AbbrevNumber) + "] 0x" +
+ Twine::utohexstr(Die->getOffset()) + ":0x" +
+ Twine::utohexstr(Die->getSize()) + " " +
+ dwarf::TagString(Abbrev->getTag()));
+ EmitULEB128(AbbrevNumber);
+
+ SmallVector<DIEValue*, 32> &Values = Die->getValues();
+ const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
+
+ // Emit the DIE attribute values.
+ for (unsigned i = 0, N = Values.size(); i < N; ++i) {
+ unsigned Attr = AbbrevData[i].getAttribute();
+ unsigned Form = AbbrevData[i].getForm();
+ assert(Form && "Too many attributes for DIE (check abbreviation)");
+
+ if (Asm->VerboseAsm)
+ Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
+
+ switch (Attr) {
+ case dwarf::DW_AT_sibling:
+ Asm->EmitInt32(Die->getSiblingOffset());
+ break;
+ case dwarf::DW_AT_abstract_origin: {
+ DIEEntry *E = cast<DIEEntry>(Values[i]);
+ DIE *Origin = E->getEntry();
+ unsigned Addr = Origin->getOffset();
+ Asm->EmitInt32(Addr);
+ break;
+ }
+ default:
+ // Emit an attribute using the defined form.
+ Values[i]->EmitValue(this, Form);
+ O << "\n"; // REMOVE This once all EmitValue impls emit their own newline.
+ break;
+ }
+ }
+
+ // Emit the DIE children if any.
+ if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
+ const std::vector<DIE *> &Children = Die->getChildren();
+
+ for (unsigned j = 0, M = Children.size(); j < M; ++j)
+ emitDIE(Children[j]);
+
+ Asm->EmitInt8(0); EOL("End Of Children Mark");
+ }
+}
+
+/// emitDebugInfo - Emit the debug info section.
+///
+void DwarfDebug::emitDebugInfo() {
+ // Start debug info section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfInfoSection());
+ DIE *Die = ModuleCU->getCUDie();
+
+ // Emit the compile units header.
+ EmitLabel("info_begin", ModuleCU->getID());
+
+ // Emit size of content not including length itself
+ unsigned ContentSize = Die->getSize() +
+ sizeof(int16_t) + // DWARF version number
+ sizeof(int32_t) + // Offset Into Abbrev. Section
+ sizeof(int8_t) + // Pointer Size (in bytes)
+ sizeof(int32_t); // FIXME - extra pad for gdb bug.
+
+ Asm->EmitInt32(ContentSize); EOL("Length of Compilation Unit Info");
+ Asm->EmitInt16(dwarf::DWARF_VERSION); EOL("DWARF version number");
+ EmitSectionOffset("abbrev_begin", "section_abbrev", 0, 0, true, false);
+ EOL("Offset Into Abbrev. Section");
+ Asm->EmitInt8(TD->getPointerSize()); EOL("Address Size (in bytes)");
+
+ emitDIE(Die);
+ // FIXME - extra padding for gdb bug.
+ Asm->EmitInt8(0); EOL("Extra Pad For GDB");
+ Asm->EmitInt8(0); EOL("Extra Pad For GDB");
+ Asm->EmitInt8(0); EOL("Extra Pad For GDB");
+ Asm->EmitInt8(0); EOL("Extra Pad For GDB");
+ EmitLabel("info_end", ModuleCU->getID());
+ Asm->O << '\n';
+}
+
+/// emitAbbreviations - Emit the abbreviation section.
+///
+void DwarfDebug::emitAbbreviations() const {
+ // Check to see if it is worth the effort.
+ if (!Abbreviations.empty()) {
+ // Start the debug abbrev section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfAbbrevSection());
+
+ EmitLabel("abbrev_begin", 0);
+
+ // For each abbrevation.
+ for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
+ // Get abbreviation data
+ const DIEAbbrev *Abbrev = Abbreviations[i];
+
+ // Emit the abbrevations code (base 1 index.)
+ EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
+
+ // Emit the abbreviations data.
+ Abbrev->Emit(this);
+ Asm->O << '\n';
+ }
+
+ // Mark end of abbreviations.
+ EmitULEB128(0, "EOM(3)");
+
+ EmitLabel("abbrev_end", 0);
+ Asm->O << '\n';
+ }
+}
+
+/// emitEndOfLineMatrix - Emit the last address of the section and the end of
+/// the line matrix.
+///
+void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
+ // Define last address of section.
+ Asm->EmitInt8(0); EOL("Extended Op");
+ Asm->EmitInt8(TD->getPointerSize() + 1); EOL("Op size");
+ Asm->EmitInt8(dwarf::DW_LNE_set_address); EOL("DW_LNE_set_address");
+ EmitReference("section_end", SectionEnd); EOL("Section end label");
+
+ // Mark end of matrix.
+ Asm->EmitInt8(0); EOL("DW_LNE_end_sequence");
+ Asm->EmitInt8(1);
+ Asm->EmitInt8(1);
+}
+
+/// emitDebugLines - Emit source line information.
+///
+void DwarfDebug::emitDebugLines() {
+ // If the target is using .loc/.file, the assembler will be emitting the
+ // .debug_line table automatically.
+ if (MAI->hasDotLocAndDotFile())
+ return;
+
+ // Minimum line delta, thus ranging from -10..(255-10).
+ const int MinLineDelta = -(dwarf::DW_LNS_fixed_advance_pc + 1);
+ // Maximum line delta, thus ranging from -10..(255-10).
+ const int MaxLineDelta = 255 + MinLineDelta;
+
+ // Start the dwarf line section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfLineSection());
+
+ // Construct the section header.
+ EmitDifference("line_end", 0, "line_begin", 0, true);
+ EOL("Length of Source Line Info");
+ EmitLabel("line_begin", 0);
+
+ Asm->EmitInt16(dwarf::DWARF_VERSION); EOL("DWARF version number");
+
+ EmitDifference("line_prolog_end", 0, "line_prolog_begin", 0, true);
+ EOL("Prolog Length");
+ EmitLabel("line_prolog_begin", 0);
+
+ Asm->EmitInt8(1); EOL("Minimum Instruction Length");
+ Asm->EmitInt8(1); EOL("Default is_stmt_start flag");
+ Asm->EmitInt8(MinLineDelta); EOL("Line Base Value (Special Opcodes)");
+ Asm->EmitInt8(MaxLineDelta); EOL("Line Range Value (Special Opcodes)");
+ Asm->EmitInt8(-MinLineDelta); EOL("Special Opcode Base");
+
+ // Line number standard opcode encodings argument count
+ Asm->EmitInt8(0); EOL("DW_LNS_copy arg count");
+ Asm->EmitInt8(1); EOL("DW_LNS_advance_pc arg count");
+ Asm->EmitInt8(1); EOL("DW_LNS_advance_line arg count");
+ Asm->EmitInt8(1); EOL("DW_LNS_set_file arg count");
+ Asm->EmitInt8(1); EOL("DW_LNS_set_column arg count");
+ Asm->EmitInt8(0); EOL("DW_LNS_negate_stmt arg count");
+ Asm->EmitInt8(0); EOL("DW_LNS_set_basic_block arg count");
+ Asm->EmitInt8(0); EOL("DW_LNS_const_add_pc arg count");
+ Asm->EmitInt8(1); EOL("DW_LNS_fixed_advance_pc arg count");
+
+ // Emit directories.
+ for (unsigned DI = 1, DE = getNumSourceDirectories()+1; DI != DE; ++DI) {
+ const std::string &Dir = getSourceDirectoryName(DI);
+ if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("Directory");
+ Asm->OutStreamer.EmitBytes(StringRef(Dir.c_str(), Dir.size()+1), 0);
+ }
+
+ Asm->EmitInt8(0); EOL("End of directories");
+
+ // Emit files.
+ for (unsigned SI = 1, SE = getNumSourceIds()+1; SI != SE; ++SI) {
+ // Remember source id starts at 1.
+ std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(SI);
+ const std::string &FN = getSourceFileName(Id.second);
+ if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("Source");
+ Asm->OutStreamer.EmitBytes(StringRef(FN.c_str(), FN.size()+1), 0);
+
+ EmitULEB128(Id.first, "Directory #");
+ EmitULEB128(0, "Mod date");
+ EmitULEB128(0, "File size");
+ }
+
+ Asm->EmitInt8(0); EOL("End of files");
+
+ EmitLabel("line_prolog_end", 0);
+
+ // A sequence for each text section.
+ unsigned SecSrcLinesSize = SectionSourceLines.size();
+
+ for (unsigned j = 0; j < SecSrcLinesSize; ++j) {
+ // Isolate current sections line info.
+ const std::vector<SrcLineInfo> &LineInfos = SectionSourceLines[j];
+
+ /*if (Asm->isVerbose()) {
+ const MCSection *S = SectionMap[j + 1];
+ O << '\t' << MAI->getCommentString() << " Section"
+ << S->getName() << '\n';
+ }*/
+ Asm->O << '\n';
+
+ // Dwarf assumes we start with first line of first source file.
+ unsigned Source = 1;
+ unsigned Line = 1;
+
+ // Construct rows of the address, source, line, column matrix.
+ for (unsigned i = 0, N = LineInfos.size(); i < N; ++i) {
+ const SrcLineInfo &LineInfo = LineInfos[i];
+ unsigned LabelID = MMI->MappedLabel(LineInfo.getLabelID());
+ if (!LabelID) continue;
+
+ if (LineInfo.getLine() == 0) continue;
+
+ if (!Asm->isVerbose())
+ Asm->O << '\n';
+ else {
+ std::pair<unsigned, unsigned> SourceID =
+ getSourceDirectoryAndFileIds(LineInfo.getSourceID());
+ O << '\t' << MAI->getCommentString() << ' '
+ << getSourceDirectoryName(SourceID.first) << '/'
+ << getSourceFileName(SourceID.second)
+ << ':' << utostr_32(LineInfo.getLine()) << '\n';
+ }
+
+ // Define the line address.
+ Asm->EmitInt8(0); EOL("Extended Op");
+ Asm->EmitInt8(TD->getPointerSize() + 1); EOL("Op size");
+ Asm->EmitInt8(dwarf::DW_LNE_set_address); EOL("DW_LNE_set_address");
+ EmitReference("label", LabelID); EOL("Location label");
+
+ // If change of source, then switch to the new source.
+ if (Source != LineInfo.getSourceID()) {
+ Source = LineInfo.getSourceID();
+ Asm->EmitInt8(dwarf::DW_LNS_set_file); EOL("DW_LNS_set_file");
+ EmitULEB128(Source, "New Source");
+ }
+
+ // If change of line.
+ if (Line != LineInfo.getLine()) {
+ // Determine offset.
+ int Offset = LineInfo.getLine() - Line;
+ int Delta = Offset - MinLineDelta;
+
+ // Update line.
+ Line = LineInfo.getLine();
+
+ // If delta is small enough and in range...
+ if (Delta >= 0 && Delta < (MaxLineDelta - 1)) {
+ // ... then use fast opcode.
+ Asm->EmitInt8(Delta - MinLineDelta); EOL("Line Delta");
+ } else {
+ // ... otherwise use long hand.
+ Asm->EmitInt8(dwarf::DW_LNS_advance_line);
+ EOL("DW_LNS_advance_line");
+ EmitSLEB128(Offset, "Line Offset");
+ Asm->EmitInt8(dwarf::DW_LNS_copy); EOL("DW_LNS_copy");
+ }
+ } else {
+ // Copy the previous row (different address or source)
+ Asm->EmitInt8(dwarf::DW_LNS_copy); EOL("DW_LNS_copy");
+ }
+ }
+
+ emitEndOfLineMatrix(j + 1);
+ }
+
+ if (SecSrcLinesSize == 0)
+ // Because we're emitting a debug_line section, we still need a line
+ // table. The linker and friends expect it to exist. If there's nothing to
+ // put into it, emit an empty table.
+ emitEndOfLineMatrix(1);
+
+ EmitLabel("line_end", 0);
+ Asm->O << '\n';
+}
+
+/// emitCommonDebugFrame - Emit common frame info into a debug frame section.
+///
+void DwarfDebug::emitCommonDebugFrame() {
+ if (!MAI->doesDwarfRequireFrameSection())
+ return;
+
+ int stackGrowth =
+ Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
+ TargetFrameInfo::StackGrowsUp ?
+ TD->getPointerSize() : -TD->getPointerSize();
+
+ // Start the dwarf frame section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfFrameSection());
+
+ EmitLabel("debug_frame_common", 0);
+ EmitDifference("debug_frame_common_end", 0,
+ "debug_frame_common_begin", 0, true);
+ EOL("Length of Common Information Entry");
+
+ EmitLabel("debug_frame_common_begin", 0);
+ Asm->EmitInt32((int)dwarf::DW_CIE_ID);
+ EOL("CIE Identifier Tag");
+ Asm->EmitInt8(dwarf::DW_CIE_VERSION);
+ EOL("CIE Version");
+ Asm->OutStreamer.EmitIntValue(0, 1, /*addrspace*/0); // nul terminator.
+ EOL("CIE Augmentation");
+ EmitULEB128(1, "CIE Code Alignment Factor");
+ EmitSLEB128(stackGrowth, "CIE Data Alignment Factor");
+ Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), false));
+ EOL("CIE RA Column");
+
+ std::vector<MachineMove> Moves;
+ RI->getInitialFrameState(Moves);
+
+ EmitFrameMoves(NULL, 0, Moves, false);
+
+ Asm->EmitAlignment(2, 0, 0, false);
+ EmitLabel("debug_frame_common_end", 0);
+ Asm->O << '\n';
+}
+
+/// emitFunctionDebugFrame - Emit per function frame info into a debug frame
+/// section.
+void
+DwarfDebug::emitFunctionDebugFrame(const FunctionDebugFrameInfo&DebugFrameInfo){
+ if (!MAI->doesDwarfRequireFrameSection())
+ return;
+
+ // Start the dwarf frame section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfFrameSection());
+
+ EmitDifference("debug_frame_end", DebugFrameInfo.Number,
+ "debug_frame_begin", DebugFrameInfo.Number, true);
+ EOL("Length of Frame Information Entry");
+
+ EmitLabel("debug_frame_begin", DebugFrameInfo.Number);
+
+ EmitSectionOffset("debug_frame_common", "section_debug_frame",
+ 0, 0, true, false);
+ EOL("FDE CIE offset");
+
+ EmitReference("func_begin", DebugFrameInfo.Number);
+ EOL("FDE initial location");
+ EmitDifference("func_end", DebugFrameInfo.Number,
+ "func_begin", DebugFrameInfo.Number);
+ EOL("FDE address range");
+
+ EmitFrameMoves("func_begin", DebugFrameInfo.Number, DebugFrameInfo.Moves,
+ false);
+
+ Asm->EmitAlignment(2, 0, 0, false);
+ EmitLabel("debug_frame_end", DebugFrameInfo.Number);
+ Asm->O << '\n';
+}
+
+/// emitDebugPubNames - Emit visible names into a debug pubnames section.
+///
+void DwarfDebug::emitDebugPubNames() {
+ // Start the dwarf pubnames section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfPubNamesSection());
+
+ EmitDifference("pubnames_end", ModuleCU->getID(),
+ "pubnames_begin", ModuleCU->getID(), true);
+ EOL("Length of Public Names Info");
+
+ EmitLabel("pubnames_begin", ModuleCU->getID());
+
+ Asm->EmitInt16(dwarf::DWARF_VERSION); EOL("DWARF Version");
+
+ EmitSectionOffset("info_begin", "section_info",
+ ModuleCU->getID(), 0, true, false);
+ EOL("Offset of Compilation Unit Info");
+
+ EmitDifference("info_end", ModuleCU->getID(), "info_begin", ModuleCU->getID(),
+ true);
+ EOL("Compilation Unit Length");
+
+ const StringMap<DIE*> &Globals = ModuleCU->getGlobals();
+ for (StringMap<DIE*>::const_iterator
+ GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
+ const char *Name = GI->getKeyData();
+ DIE * Entity = GI->second;
+
+ Asm->EmitInt32(Entity->getOffset()); EOL("DIE offset");
+
+ if (Asm->VerboseAsm)
+ Asm->OutStreamer.AddComment("External Name");
+ Asm->OutStreamer.EmitBytes(StringRef(Name, strlen(Name)+1), 0);
+ }
+
+ Asm->EmitInt32(0); EOL("End Mark");
+ EmitLabel("pubnames_end", ModuleCU->getID());
+ Asm->O << '\n';
+}
+
+void DwarfDebug::emitDebugPubTypes() {
+ // Start the dwarf pubnames section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfPubTypesSection());
+ EmitDifference("pubtypes_end", ModuleCU->getID(),
+ "pubtypes_begin", ModuleCU->getID(), true);
+ EOL("Length of Public Types Info");
+
+ EmitLabel("pubtypes_begin", ModuleCU->getID());
+
+ if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("DWARF Version");
+ Asm->EmitInt16(dwarf::DWARF_VERSION);
+
+ EmitSectionOffset("info_begin", "section_info",
+ ModuleCU->getID(), 0, true, false);
+ EOL("Offset of Compilation ModuleCU Info");
+
+ EmitDifference("info_end", ModuleCU->getID(), "info_begin", ModuleCU->getID(),
+ true);
+ EOL("Compilation ModuleCU Length");
+
+ const StringMap<DIE*> &Globals = ModuleCU->getGlobalTypes();
+ for (StringMap<DIE*>::const_iterator
+ GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
+ const char *Name = GI->getKeyData();
+ DIE * Entity = GI->second;
+
+ if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("DIE offset");
+ Asm->EmitInt32(Entity->getOffset());
+
+ if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("External Name");
+ Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength()+1), 0);
+ }
+
+ Asm->EmitInt32(0); EOL("End Mark");
+ EmitLabel("pubtypes_end", ModuleCU->getID());
+ Asm->O << '\n';
+}
+
+/// emitDebugStr - Emit visible names into a debug str section.
+///
+void DwarfDebug::emitDebugStr() {
+ // Check to see if it is worth the effort.
+ if (!StringPool.empty()) {
+ // Start the dwarf str section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfStrSection());
+
+ // For each of strings in the string pool.
+ for (unsigned StringID = 1, N = StringPool.size();
+ StringID <= N; ++StringID) {
+ // Emit a label for reference from debug information entries.
+ EmitLabel("string", StringID);
+
+ // Emit the string itself.
+ const std::string &String = StringPool[StringID];
+ Asm->OutStreamer.EmitBytes(StringRef(String.c_str(), String.size()+1), 0);
+ }
+
+ Asm->O << '\n';
+ }
+}
+
+/// emitDebugLoc - Emit visible names into a debug loc section.
+///
+void DwarfDebug::emitDebugLoc() {
+ // Start the dwarf loc section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfLocSection());
+}
+
+/// EmitDebugARanges - Emit visible names into a debug aranges section.
+///
+void DwarfDebug::EmitDebugARanges() {
+ // Start the dwarf aranges section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfARangesSection());
+
+ // FIXME - Mock up
+#if 0
+ CompileUnit *Unit = GetBaseCompileUnit();
+
+ // Don't include size of length
+ Asm->EmitInt32(0x1c); EOL("Length of Address Ranges Info");
+
+ Asm->EmitInt16(dwarf::DWARF_VERSION); EOL("Dwarf Version");
+
+ EmitReference("info_begin", Unit->getID());
+ EOL("Offset of Compilation Unit Info");
+
+ Asm->EmitInt8(TD->getPointerSize()); EOL("Size of Address");
+
+ Asm->EmitInt8(0); EOL("Size of Segment Descriptor");
+
+ Asm->EmitInt16(0); EOL("Pad (1)");
+ Asm->EmitInt16(0); EOL("Pad (2)");
+
+ // Range 1
+ EmitReference("text_begin", 0); EOL("Address");
+ EmitDifference("text_end", 0, "text_begin", 0, true); EOL("Length");
+
+ Asm->EmitInt32(0); EOL("EOM (1)");
+ Asm->EmitInt32(0); EOL("EOM (2)");
+#endif
+}
+
+/// emitDebugRanges - Emit visible names into a debug ranges section.
+///
+void DwarfDebug::emitDebugRanges() {
+ // Start the dwarf ranges section.
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfRangesSection());
+}
+
+/// emitDebugMacInfo - Emit visible names into a debug macinfo section.
+///
+void DwarfDebug::emitDebugMacInfo() {
+ if (const MCSection *LineInfo =
+ Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
+ // Start the dwarf macinfo section.
+ Asm->OutStreamer.SwitchSection(LineInfo);
+ }
+}
+
+/// emitDebugInlineInfo - Emit inline info using following format.
+/// Section Header:
+/// 1. length of section
+/// 2. Dwarf version number
+/// 3. address size.
+///
+/// Entries (one "entry" for each function that was inlined):
+///
+/// 1. offset into __debug_str section for MIPS linkage name, if exists;
+/// otherwise offset into __debug_str for regular function name.
+/// 2. offset into __debug_str section for regular function name.
+/// 3. an unsigned LEB128 number indicating the number of distinct inlining
+/// instances for the function.
+///
+/// The rest of the entry consists of a {die_offset, low_pc} pair for each
+/// inlined instance; the die_offset points to the inlined_subroutine die in the
+/// __debug_info section, and the low_pc is the starting address for the
+/// inlining instance.
+void DwarfDebug::emitDebugInlineInfo() {
+ if (!MAI->doesDwarfUsesInlineInfoSection())
+ return;
+
+ if (!ModuleCU)
+ return;
+
+ Asm->OutStreamer.SwitchSection(
+ Asm->getObjFileLowering().getDwarfDebugInlineSection());
+
+ EmitDifference("debug_inlined_end", 1,
+ "debug_inlined_begin", 1, true);
+ EOL("Length of Debug Inlined Information Entry");
+
+ EmitLabel("debug_inlined_begin", 1);
+
+ Asm->EmitInt16(dwarf::DWARF_VERSION); EOL("Dwarf Version");
+ Asm->EmitInt8(TD->getPointerSize()); EOL("Address Size (in bytes)");
+
+ for (SmallVector<MDNode *, 4>::iterator I = InlinedSPNodes.begin(),
+ E = InlinedSPNodes.end(); I != E; ++I) {
+
+ MDNode *Node = *I;
+ DenseMap<MDNode *, SmallVector<InlineInfoLabels, 4> >::iterator II
+ = InlineInfo.find(Node);
+ SmallVector<InlineInfoLabels, 4> &Labels = II->second;
+ DISubprogram SP(Node);
+ StringRef LName = SP.getLinkageName();
+ StringRef Name = SP.getName();
+
+ if (LName.empty()) {
+ Asm->OutStreamer.EmitBytes(Name, 0);
+ Asm->OutStreamer.EmitIntValue(0, 1, 0); // nul terminator.
+ } else
+ EmitSectionOffset("string", "section_str",
+ StringPool.idFor(getRealLinkageName(LName)), false, true);
+
+ EOL("MIPS linkage name");
+ EmitSectionOffset("string", "section_str",
+ StringPool.idFor(Name), false, true);
+ EOL("Function name");
+ EmitULEB128(Labels.size(), "Inline count");
+
+ for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(),
+ LE = Labels.end(); LI != LE; ++LI) {
+ DIE *SP = LI->second;
+ Asm->EmitInt32(SP->getOffset()); EOL("DIE offset");
+
+ if (TD->getPointerSize() == sizeof(int32_t))
+ O << MAI->getData32bitsDirective();
+ else
+ O << MAI->getData64bitsDirective();
+
+ PrintLabelName("label", LI->first); EOL("low_pc");
+ }
+ }
+
+ EmitLabel("debug_inlined_end", 1);
+ Asm->O << '\n';
+}
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
new file mode 100644
index 0000000..55baa92
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -0,0 +1,566 @@
+//===-- llvm/CodeGen/DwarfDebug.h - Dwarf Debug Framework ------*- C++ -*--===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing dwarf debug info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CODEGEN_ASMPRINTER_DWARFDEBUG_H__
+#define CODEGEN_ASMPRINTER_DWARFDEBUG_H__
+
+#include "DIE.h"
+#include "DwarfPrinter.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineLocation.h"
+#include "llvm/Analysis/DebugInfo.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/UniqueVector.h"
+#include <string>
+
+namespace llvm {
+
+class CompileUnit;
+class DbgConcreteScope;
+class DbgScope;
+class DbgVariable;
+class MachineFrameInfo;
+class MachineModuleInfo;
+class MCAsmInfo;
+class Timer;
+
+//===----------------------------------------------------------------------===//
+/// SrcLineInfo - This class is used to record source line correspondence.
+///
+class SrcLineInfo {
+ unsigned Line; // Source line number.
+ unsigned Column; // Source column.
+ unsigned SourceID; // Source ID number.
+ unsigned LabelID; // Label in code ID number.
+public:
+ SrcLineInfo(unsigned L, unsigned C, unsigned S, unsigned I)
+ : Line(L), Column(C), SourceID(S), LabelID(I) {}
+
+ // Accessors
+ unsigned getLine() const { return Line; }
+ unsigned getColumn() const { return Column; }
+ unsigned getSourceID() const { return SourceID; }
+ unsigned getLabelID() const { return LabelID; }
+};
+
+class DwarfDebug : public DwarfPrinter {
+ //===--------------------------------------------------------------------===//
+ // Attributes used to construct specific Dwarf sections.
+ //
+
+ /// CompileUnitMap - A map of global variables representing compile units to
+ /// compile units.
+ DenseMap<Value *, CompileUnit *> CompileUnitMap;
+
+ /// CompileUnits - All the compile units in this module.
+ ///
+ SmallVector<CompileUnit *, 8> CompileUnits;
+
+ /// ModuleCU - All DIEs are inserted in ModuleCU.
+ CompileUnit *ModuleCU;
+
+ /// AbbreviationsSet - Used to uniquely define abbreviations.
+ ///
+ FoldingSet<DIEAbbrev> AbbreviationsSet;
+
+ /// Abbreviations - A list of all the unique abbreviations in use.
+ ///
+ std::vector<DIEAbbrev *> Abbreviations;
+
+ /// DirectoryIdMap - Directory name to directory id map.
+ ///
+ StringMap<unsigned> DirectoryIdMap;
+
+ /// DirectoryNames - A list of directory names.
+ SmallVector<std::string, 8> DirectoryNames;
+
+ /// SourceFileIdMap - Source file name to source file id map.
+ ///
+ StringMap<unsigned> SourceFileIdMap;
+
+ /// SourceFileNames - A list of source file names.
+ SmallVector<std::string, 8> SourceFileNames;
+
+ /// SourceIdMap - Source id map, i.e. pair of directory id and source file
+ /// id mapped to a unique id.
+ DenseMap<std::pair<unsigned, unsigned>, unsigned> SourceIdMap;
+
+ /// SourceIds - Reverse map from source id to directory id + file id pair.
+ ///
+ SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;
+
+ /// Lines - List of source line correspondence.
+ std::vector<SrcLineInfo> Lines;
+
+ /// DIEValues - A list of all the unique values in use.
+ ///
+ std::vector<DIEValue *> DIEValues;
+
+ /// StringPool - A UniqueVector of strings used by indirect references.
+ ///
+ UniqueVector<std::string> StringPool;
+
+ /// SectionMap - Provides a unique id per text section.
+ ///
+ UniqueVector<const MCSection*> SectionMap;
+
+ /// SectionSourceLines - Tracks line numbers per text section.
+ ///
+ std::vector<std::vector<SrcLineInfo> > SectionSourceLines;
+
+ /// didInitial - Flag to indicate if initial emission has been done.
+ ///
+ bool didInitial;
+
+ /// shouldEmit - Flag to indicate if debug information should be emitted.
+ ///
+ bool shouldEmit;
+
+ // CurrentFnDbgScope - Top level scope for the current function.
+ //
+ DbgScope *CurrentFnDbgScope;
+
+ /// DbgScopeMap - Tracks the scopes in the current function.
+ ///
+ DenseMap<MDNode *, DbgScope *> DbgScopeMap;
+
+ /// ConcreteScopes - Tracks the concrete scopees in the current function.
+ /// These scopes are also included in DbgScopeMap.
+ DenseMap<MDNode *, DbgScope *> ConcreteScopes;
+
+ /// AbstractScopes - Tracks the abstract scopes a module. These scopes are
+ /// not included DbgScopeMap.
+ DenseMap<MDNode *, DbgScope *> AbstractScopes;
+ SmallVector<DbgScope *, 4>AbstractScopesList;
+
+ /// AbstractVariables - Collection on abstract variables.
+ DenseMap<MDNode *, DbgVariable *> AbstractVariables;
+
+ /// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
+ /// (at the end of the module) as DW_AT_inline.
+ SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
+
+ DenseMap<DIE *, MDNode *> ContainingTypeMap;
+
+ /// AbstractSubprogramDIEs - Collection of abstruct subprogram DIEs.
+ SmallPtrSet<DIE *, 4> AbstractSubprogramDIEs;
+
+ /// TopLevelDIEs - Collection of top level DIEs.
+ SmallPtrSet<DIE *, 4> TopLevelDIEs;
+ SmallVector<DIE *, 4> TopLevelDIEsVector;
+
+ typedef SmallVector<DbgScope *, 2> ScopeVector;
+ typedef DenseMap<const MachineInstr *, ScopeVector>
+ InsnToDbgScopeMapTy;
+
+ /// DbgScopeBeginMap - Maps instruction with a list of DbgScopes it starts.
+ InsnToDbgScopeMapTy DbgScopeBeginMap;
+
+ /// DbgScopeEndMap - Maps instruction with a list DbgScopes it ends.
+ InsnToDbgScopeMapTy DbgScopeEndMap;
+
+ /// InlineInfo - Keep track of inlined functions and their location. This
+ /// information is used to populate debug_inlined section.
+ typedef std::pair<unsigned, DIE *> InlineInfoLabels;
+ DenseMap<MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
+ SmallVector<MDNode *, 4> InlinedSPNodes;
+
+ /// CompileUnitOffsets - A vector of the offsets of the compile units. This is
+ /// used when calculating the "origin" of a concrete instance of an inlined
+ /// function.
+ DenseMap<CompileUnit *, unsigned> CompileUnitOffsets;
+
+ /// DebugTimer - Timer for the Dwarf debug writer.
+ Timer *DebugTimer;
+
+ struct FunctionDebugFrameInfo {
+ unsigned Number;
+ std::vector<MachineMove> Moves;
+
+ FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
+ : Number(Num), Moves(M) {}
+ };
+
+ std::vector<FunctionDebugFrameInfo> DebugFrames;
+
+ /// getSourceDirectoryAndFileIds - Return the directory and file ids that
+ /// maps to the source id. Source id starts at 1.
+ std::pair<unsigned, unsigned>
+ getSourceDirectoryAndFileIds(unsigned SId) const {
+ return SourceIds[SId-1];
+ }
+
+ /// getNumSourceDirectories - Return the number of source directories in the
+ /// debug info.
+ unsigned getNumSourceDirectories() const {
+ return DirectoryNames.size();
+ }
+
+ /// getSourceDirectoryName - Return the name of the directory corresponding
+ /// to the id.
+ const std::string &getSourceDirectoryName(unsigned Id) const {
+ return DirectoryNames[Id - 1];
+ }
+
+ /// getSourceFileName - Return the name of the source file corresponding
+ /// to the id.
+ const std::string &getSourceFileName(unsigned Id) const {
+ return SourceFileNames[Id - 1];
+ }
+
+ /// getNumSourceIds - Return the number of unique source ids.
+ unsigned getNumSourceIds() const {
+ return SourceIds.size();
+ }
+
+ /// assignAbbrevNumber - Define a unique number for the abbreviation.
+ ///
+ void assignAbbrevNumber(DIEAbbrev &Abbrev);
+
+ /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
+ /// information entry.
+ DIEEntry *createDIEEntry(DIE *Entry = NULL);
+
+ /// addUInt - Add an unsigned integer attribute data and value.
+ ///
+ void addUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer);
+
+ /// addSInt - Add an signed integer attribute data and value.
+ ///
+ void addSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer);
+
+ /// addString - Add a string attribute data and value.
+ ///
+ void addString(DIE *Die, unsigned Attribute, unsigned Form,
+ const StringRef Str);
+
+ /// addLabel - Add a Dwarf label attribute data and value.
+ ///
+ void addLabel(DIE *Die, unsigned Attribute, unsigned Form,
+ const DWLabel &Label);
+
+ /// addObjectLabel - Add an non-Dwarf label attribute data and value.
+ ///
+ void addObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
+ const MCSymbol *Sym);
+
+ /// addSectionOffset - Add a section offset label attribute data and value.
+ ///
+ void addSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
+ const DWLabel &Label, const DWLabel &Section,
+ bool isEH = false, bool useSet = true);
+
+ /// addDelta - Add a label delta attribute data and value.
+ ///
+ void addDelta(DIE *Die, unsigned Attribute, unsigned Form,
+ const DWLabel &Hi, const DWLabel &Lo);
+
+ /// addDIEEntry - Add a DIE attribute data and value.
+ ///
+ void addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
+ Die->addValue(Attribute, Form, createDIEEntry(Entry));
+ }
+
+ /// addBlock - Add block data.
+ ///
+ void addBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block);
+
+ /// addSourceLine - Add location information to specified debug information
+ /// entry.
+ void addSourceLine(DIE *Die, const DIVariable *V);
+ void addSourceLine(DIE *Die, const DIGlobal *G);
+ void addSourceLine(DIE *Die, const DISubprogram *SP);
+ void addSourceLine(DIE *Die, const DIType *Ty);
+ void addSourceLine(DIE *Die, const DINameSpace *NS);
+
+ /// addAddress - Add an address attribute to a die based on the location
+ /// provided.
+ void addAddress(DIE *Die, unsigned Attribute,
+ const MachineLocation &Location);
+
+ /// addComplexAddress - Start with the address based on the location provided,
+ /// and generate the DWARF information necessary to find the actual variable
+ /// (navigating the extra location information encoded in the type) based on
+ /// the starting location. Add the DWARF information to the die.
+ ///
+ void addComplexAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
+ const MachineLocation &Location);
+
+ // FIXME: Should be reformulated in terms of addComplexAddress.
+ /// addBlockByrefAddress - Start with the address based on the location
+ /// provided, and generate the DWARF information necessary to find the
+ /// actual Block variable (navigating the Block struct) based on the
+ /// starting location. Add the DWARF information to the die. Obsolete,
+ /// please use addComplexAddress instead.
+ ///
+ void addBlockByrefAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
+ const MachineLocation &Location);
+
+ /// addToContextOwner - Add Die into the list of its context owner's children.
+ void addToContextOwner(DIE *Die, DIDescriptor Context);
+
+ /// addType - Add a new type attribute to the specified entity.
+ void addType(DIE *Entity, DIType Ty);
+
+
+ /// getOrCreateNameSpace - Create a DIE for DINameSpace.
+ DIE *getOrCreateNameSpace(DINameSpace NS);
+
+ /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
+ /// given DIType.
+ DIE *getOrCreateTypeDIE(DIType Ty);
+
+ void addPubTypes(DISubprogram SP);
+
+ /// constructTypeDIE - Construct basic type die from DIBasicType.
+ void constructTypeDIE(DIE &Buffer,
+ DIBasicType BTy);
+
+ /// constructTypeDIE - Construct derived type die from DIDerivedType.
+ void constructTypeDIE(DIE &Buffer,
+ DIDerivedType DTy);
+
+ /// constructTypeDIE - Construct type DIE from DICompositeType.
+ void constructTypeDIE(DIE &Buffer,
+ DICompositeType CTy);
+
+ /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
+ void constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
+
+ /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
+ void constructArrayTypeDIE(DIE &Buffer,
+ DICompositeType *CTy);
+
+ /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
+ DIE *constructEnumTypeDIE(DIEnumerator *ETy);
+
+ /// createGlobalVariableDIE - Create new DIE using GV.
+ DIE *createGlobalVariableDIE(const DIGlobalVariable &GV);
+
+ /// createMemberDIE - Create new member DIE.
+ DIE *createMemberDIE(const DIDerivedType &DT);
+
+ /// createSubprogramDIE - Create new DIE using SP.
+ DIE *createSubprogramDIE(const DISubprogram &SP, bool MakeDecl = false);
+
+ /// findCompileUnit - Get the compile unit for the given descriptor.
+ ///
+ CompileUnit *findCompileUnit(DICompileUnit Unit);
+
+ /// getUpdatedDbgScope - Find or create DbgScope assicated with
+ /// the instruction. Initialize scope and update scope hierarchy.
+ DbgScope *getUpdatedDbgScope(MDNode *N, const MachineInstr *MI, MDNode *InlinedAt);
+
+ /// createDbgScope - Create DbgScope for the scope.
+ void createDbgScope(MDNode *Scope, MDNode *InlinedAt);
+
+ DbgScope *getOrCreateAbstractScope(MDNode *N);
+
+ /// findAbstractVariable - Find abstract variable associated with Var.
+ DbgVariable *findAbstractVariable(DIVariable &Var, unsigned FrameIdx,
+ DILocation &Loc);
+
+ /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
+ /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
+ /// If there are global variables in this scope then create and insert
+ /// DIEs for these variables.
+ DIE *updateSubprogramScopeDIE(MDNode *SPNode);
+
+ /// constructLexicalScope - Construct new DW_TAG_lexical_block
+ /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
+ DIE *constructLexicalScopeDIE(DbgScope *Scope);
+
+ /// constructInlinedScopeDIE - This scope represents inlined body of
+ /// a function. Construct DIE to represent this concrete inlined copy
+ /// of the function.
+ DIE *constructInlinedScopeDIE(DbgScope *Scope);
+
+ /// constructVariableDIE - Construct a DIE for the given DbgVariable.
+ DIE *constructVariableDIE(DbgVariable *DV, DbgScope *S);
+
+ /// constructScopeDIE - Construct a DIE for this scope.
+ DIE *constructScopeDIE(DbgScope *Scope);
+
+ /// emitInitial - Emit initial Dwarf declarations. This is necessary for cc
+ /// tools to recognize the object file contains Dwarf information.
+ void emitInitial();
+
+ /// emitDIE - Recusively Emits a debug information entry.
+ ///
+ void emitDIE(DIE *Die);
+
+ /// computeSizeAndOffset - Compute the size and offset of a DIE.
+ ///
+ unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
+
+ /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
+ ///
+ void computeSizeAndOffsets();
+
+ /// EmitDebugInfo - Emit the debug info section.
+ ///
+ void emitDebugInfo();
+
+ /// emitAbbreviations - Emit the abbreviation section.
+ ///
+ void emitAbbreviations() const;
+
+ /// emitEndOfLineMatrix - Emit the last address of the section and the end of
+ /// the line matrix.
+ ///
+ void emitEndOfLineMatrix(unsigned SectionEnd);
+
+ /// emitDebugLines - Emit source line information.
+ ///
+ void emitDebugLines();
+
+ /// emitCommonDebugFrame - Emit common frame info into a debug frame section.
+ ///
+ void emitCommonDebugFrame();
+
+ /// emitFunctionDebugFrame - Emit per function frame info into a debug frame
+ /// section.
+ void emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
+
+ /// emitDebugPubNames - Emit visible names into a debug pubnames section.
+ ///
+ void emitDebugPubNames();
+
+ /// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
+ ///
+ void emitDebugPubTypes();
+
+ /// emitDebugStr - Emit visible names into a debug str section.
+ ///
+ void emitDebugStr();
+
+ /// emitDebugLoc - Emit visible names into a debug loc section.
+ ///
+ void emitDebugLoc();
+
+ /// EmitDebugARanges - Emit visible names into a debug aranges section.
+ ///
+ void EmitDebugARanges();
+
+ /// emitDebugRanges - Emit visible names into a debug ranges section.
+ ///
+ void emitDebugRanges();
+
+ /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
+ ///
+ void emitDebugMacInfo();
+
+ /// emitDebugInlineInfo - Emit inline info using following format.
+ /// Section Header:
+ /// 1. length of section
+ /// 2. Dwarf version number
+ /// 3. address size.
+ ///
+ /// Entries (one "entry" for each function that was inlined):
+ ///
+ /// 1. offset into __debug_str section for MIPS linkage name, if exists;
+ /// otherwise offset into __debug_str for regular function name.
+ /// 2. offset into __debug_str section for regular function name.
+ /// 3. an unsigned LEB128 number indicating the number of distinct inlining
+ /// instances for the function.
+ ///
+ /// The rest of the entry consists of a {die_offset, low_pc} pair for each
+ /// inlined instance; the die_offset points to the inlined_subroutine die in
+ /// the __debug_info section, and the low_pc is the starting address for the
+ /// inlining instance.
+ void emitDebugInlineInfo();
+
+ /// GetOrCreateSourceID - Look up the source id with the given directory and
+ /// source file names. If none currently exists, create a new id and insert it
+ /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
+ /// as well.
+ unsigned GetOrCreateSourceID(StringRef DirName, StringRef FileName);
+
+ CompileUnit *constructCompileUnit(MDNode *N);
+
+ void constructGlobalVariableDIE(MDNode *N);
+
+ void constructSubprogramDIE(MDNode *N);
+
+ // FIXME: This should go away in favor of complex addresses.
+ /// Find the type the programmer originally declared the variable to be
+ /// and return that type. Obsolete, use GetComplexAddrType instead.
+ ///
+ DIType getBlockByrefType(DIType Ty, std::string Name);
+
+public:
+ //===--------------------------------------------------------------------===//
+ // Main entry points.
+ //
+ DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T);
+ virtual ~DwarfDebug();
+
+ /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
+ /// be emitted.
+ bool ShouldEmitDwarfDebug() const { return shouldEmit; }
+
+ /// beginModule - Emit all Dwarf sections that should come prior to the
+ /// content.
+ void beginModule(Module *M, MachineModuleInfo *MMI);
+
+ /// endModule - Emit all Dwarf sections that should come after the content.
+ ///
+ void endModule();
+
+ /// beginFunction - Gather pre-function debug information. Assumes being
+ /// emitted immediately after the function entry point.
+ void beginFunction(const MachineFunction *MF);
+
+ /// endFunction - Gather and emit post-function debug information.
+ ///
+ void endFunction(const MachineFunction *MF);
+
+ /// recordSourceLine - Records location information and associates it with a
+ /// label. Returns a unique label ID used to generate a label and provide
+ /// correspondence to the source line list.
+ unsigned recordSourceLine(unsigned Line, unsigned Col, MDNode *Scope);
+
+ /// getSourceLineCount - Return the number of source lines in the debug
+ /// info.
+ unsigned getSourceLineCount() const {
+ return Lines.size();
+ }
+
+ /// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
+ /// timed. Look up the source id with the given directory and source file
+ /// names. If none currently exists, create a new id and insert it in the
+ /// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
+ /// well.
+ unsigned getOrCreateSourceID(const std::string &DirName,
+ const std::string &FileName);
+
+ /// extractScopeInformation - Scan machine instructions in this function
+ /// and collect DbgScopes. Return true, if atleast one scope was found.
+ bool extractScopeInformation();
+
+ /// collectVariableInfo - Populate DbgScope entries with variables' info.
+ void collectVariableInfo();
+
+ /// beginScope - Process beginning of a scope starting at Label.
+ void beginScope(const MachineInstr *MI, unsigned Label);
+
+ /// endScope - Prcess end of a scope.
+ void endScope(const MachineInstr *MI);
+};
+} // End of namespace llvm
+
+#endif
diff --git a/lib/CodeGen/AsmPrinter/DwarfException.cpp b/lib/CodeGen/AsmPrinter/DwarfException.cpp
new file mode 100644
index 0000000..b6801dc
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfException.cpp
@@ -0,0 +1,1021 @@
+//===-- CodeGen/AsmPrinter/DwarfException.cpp - Dwarf Exception Impl ------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing DWARF exception info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfException.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineLocation.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetFrameInfo.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/Timer.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Twine.h"
+using namespace llvm;
+
+DwarfException::DwarfException(raw_ostream &OS, AsmPrinter *A,
+ const MCAsmInfo *T)
+ : DwarfPrinter(OS, A, T, "eh"), shouldEmitTable(false),shouldEmitMoves(false),
+ shouldEmitTableModule(false), shouldEmitMovesModule(false),
+ ExceptionTimer(0) {
+ if (TimePassesIsEnabled)
+ ExceptionTimer = new Timer("DWARF Exception Writer");
+}
+
+DwarfException::~DwarfException() {
+ delete ExceptionTimer;
+}
+
+/// SizeOfEncodedValue - Return the size of the encoding in bytes.
+unsigned DwarfException::SizeOfEncodedValue(unsigned Encoding) {
+ if (Encoding == dwarf::DW_EH_PE_omit)
+ return 0;
+
+ switch (Encoding & 0x07) {
+ case dwarf::DW_EH_PE_absptr:
+ return TD->getPointerSize();
+ case dwarf::DW_EH_PE_udata2:
+ return 2;
+ case dwarf::DW_EH_PE_udata4:
+ return 4;
+ case dwarf::DW_EH_PE_udata8:
+ return 8;
+ }
+
+ assert(0 && "Invalid encoded value.");
+ return 0;
+}
+
+/// CreateLabelDiff - Emit a label and subtract it from the expression we
+/// already have. This is equivalent to emitting "foo - .", but we have to emit
+/// the label for "." directly.
+const MCExpr *DwarfException::CreateLabelDiff(const MCExpr *ExprRef,
+ const char *LabelName,
+ unsigned Index) {
+ SmallString<64> Name;
+ raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
+ << LabelName << Asm->getFunctionNumber()
+ << "_" << Index;
+ MCSymbol *DotSym = Asm->OutContext.GetOrCreateSymbol(Name.str());
+ Asm->OutStreamer.EmitLabel(DotSym);
+
+ return MCBinaryExpr::CreateSub(ExprRef,
+ MCSymbolRefExpr::Create(DotSym,
+ Asm->OutContext),
+ Asm->OutContext);
+}
+
+/// EmitCIE - Emit a Common Information Entry (CIE). This holds information that
+/// is shared among many Frame Description Entries. There is at least one CIE
+/// in every non-empty .debug_frame section.
+void DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) {
+ // Size and sign of stack growth.
+ int stackGrowth =
+ Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
+ TargetFrameInfo::StackGrowsUp ?
+ TD->getPointerSize() : -TD->getPointerSize();
+
+ const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+
+ // Begin eh frame section.
+ Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection());
+
+ if (MAI->is_EHSymbolPrivate())
+ O << MAI->getPrivateGlobalPrefix();
+ O << "EH_frame" << Index << ":\n";
+
+ EmitLabel("section_eh_frame", Index);
+
+ // Define base labels.
+ EmitLabel("eh_frame_common", Index);
+
+ // Define the eh frame length.
+ EmitDifference("eh_frame_common_end", Index,
+ "eh_frame_common_begin", Index, true);
+ EOL("Length of Common Information Entry");
+
+ // EH frame header.
+ EmitLabel("eh_frame_common_begin", Index);
+ if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("CIE Identifier Tag");
+ Asm->OutStreamer.EmitIntValue(0, 4/*size*/, 0/*addrspace*/);
+ if (Asm->VerboseAsm) Asm->OutStreamer.AddComment("DW_CIE_VERSION");
+ Asm->OutStreamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1/*size*/, 0/*addr*/);
+
+ // The personality presence indicates that language specific information will
+ // show up in the eh frame. Find out how we are supposed to lower the
+ // personality function reference:
+ const MCExpr *PersonalityRef = 0;
+ bool IsPersonalityIndirect = false, IsPersonalityPCRel = false;
+ if (PersonalityFn) {
+ // FIXME: HANDLE STATIC CODEGEN MODEL HERE.
+
+ // In non-static mode, ask the object file how to represent this reference.
+ PersonalityRef =
+ TLOF.getSymbolForDwarfGlobalReference(PersonalityFn, Asm->Mang,
+ Asm->MMI,
+ IsPersonalityIndirect,
+ IsPersonalityPCRel);
+ }
+
+ unsigned PerEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
+ if (IsPersonalityIndirect)
+ PerEncoding |= dwarf::DW_EH_PE_indirect;
+ unsigned LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
+ unsigned FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
+
+ char Augmentation[6] = { 0 };
+ unsigned AugmentationSize = 0;
+ char *APtr = Augmentation + 1;
+
+ if (PersonalityRef) {
+ // There is a personality function.
+ *APtr++ = 'P';
+ AugmentationSize += 1 + SizeOfEncodedValue(PerEncoding);
+ }
+
+ if (UsesLSDA[Index]) {
+ // An LSDA pointer is in the FDE augmentation.
+ *APtr++ = 'L';
+ ++AugmentationSize;
+ }
+
+ if (FDEEncoding != dwarf::DW_EH_PE_absptr) {
+ // A non-default pointer encoding for the FDE.
+ *APtr++ = 'R';
+ ++AugmentationSize;
+ }
+
+ if (APtr != Augmentation + 1)
+ Augmentation[0] = 'z';
+
+ Asm->OutStreamer.EmitBytes(StringRef(Augmentation, strlen(Augmentation)+1),0);
+ EOL("CIE Augmentation");
+
+ // Round out reader.
+ EmitULEB128(1, "CIE Code Alignment Factor");
+ EmitSLEB128(stackGrowth, "CIE Data Alignment Factor");
+ Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), true));
+ EOL("CIE Return Address Column");
+
+ EmitULEB128(AugmentationSize, "Augmentation Size");
+ EmitEncodingByte(PerEncoding, "Personality");
+
+ // If there is a personality, we need to indicate the function's location.
+ if (PersonalityRef) {
+ if (!IsPersonalityPCRel)
+ PersonalityRef = CreateLabelDiff(PersonalityRef, "personalityref_addr",
+ Index);
+
+ O << MAI->getData32bitsDirective() << *PersonalityRef;
+ EOL("Personality");
+
+ EmitEncodingByte(LSDAEncoding, "LSDA");
+ EmitEncodingByte(FDEEncoding, "FDE");
+ }
+
+ // Indicate locations of general callee saved registers in frame.
+ std::vector<MachineMove> Moves;
+ RI->getInitialFrameState(Moves);
+ EmitFrameMoves(NULL, 0, Moves, true);
+
+ // On Darwin the linker honors the alignment of eh_frame, which means it must
+ // be 8-byte on 64-bit targets to match what gcc does. Otherwise you get
+ // holes which confuse readers of eh_frame.
+ Asm->EmitAlignment(TD->getPointerSize() == 4 ? 2 : 3, 0, 0, false);
+ EmitLabel("eh_frame_common_end", Index);
+ Asm->O << '\n';
+}
+
+/// EmitFDE - Emit the Frame Description Entry (FDE) for the function.
+void DwarfException::EmitFDE(const FunctionEHFrameInfo &EHFrameInfo) {
+ assert(!EHFrameInfo.function->hasAvailableExternallyLinkage() &&
+ "Should not emit 'available externally' functions at all");
+
+ const Function *TheFunc = EHFrameInfo.function;
+
+ Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getEHFrameSection());
+
+ // Externally visible entry into the functions eh frame info. If the
+ // corresponding function is static, this should not be externally visible.
+ if (!TheFunc->hasLocalLinkage())
+ if (const char *GlobalEHDirective = MAI->getGlobalEHDirective())
+ O << GlobalEHDirective << *EHFrameInfo.FunctionEHSym << '\n';
+
+ // If corresponding function is weak definition, this should be too.
+ if (TheFunc->isWeakForLinker() && MAI->getWeakDefDirective())
+ O << MAI->getWeakDefDirective() << *EHFrameInfo.FunctionEHSym << '\n';
+
+ // If corresponding function is hidden, this should be too.
+ if (TheFunc->hasHiddenVisibility())
+ if (MCSymbolAttr HiddenAttr = MAI->getHiddenVisibilityAttr())
+ Asm->OutStreamer.EmitSymbolAttribute(EHFrameInfo.FunctionEHSym,
+ HiddenAttr);
+
+ // If there are no calls then you can't unwind. This may mean we can omit the
+ // EH Frame, but some environments do not handle weak absolute symbols. If
+ // UnwindTablesMandatory is set we cannot do this optimization; the unwind
+ // info is to be available for non-EH uses.
+ if (!EHFrameInfo.hasCalls && !UnwindTablesMandatory &&
+ (!TheFunc->isWeakForLinker() ||
+ !MAI->getWeakDefDirective() ||
+ MAI->getSupportsWeakOmittedEHFrame())) {
+ O << *EHFrameInfo.FunctionEHSym << " = 0\n";
+ // This name has no connection to the function, so it might get
+ // dead-stripped when the function is not, erroneously. Prohibit
+ // dead-stripping unconditionally.
+ if (MAI->hasNoDeadStrip())
+ Asm->OutStreamer.EmitSymbolAttribute(EHFrameInfo.FunctionEHSym,
+ MCSA_NoDeadStrip);
+ } else {
+ O << *EHFrameInfo.FunctionEHSym << ":\n";
+
+ // EH frame header.
+ EmitDifference("eh_frame_end", EHFrameInfo.Number,
+ "eh_frame_begin", EHFrameInfo.Number, true);
+ EOL("Length of Frame Information Entry");
+
+ EmitLabel("eh_frame_begin", EHFrameInfo.Number);
+
+ EmitSectionOffset("eh_frame_begin", "eh_frame_common",
+ EHFrameInfo.Number, EHFrameInfo.PersonalityIndex,
+ true, true, false);
+
+ EOL("FDE CIE offset");
+
+ EmitReference("eh_func_begin", EHFrameInfo.Number, true, true);
+ EOL("FDE initial location");
+ EmitDifference("eh_func_end", EHFrameInfo.Number,
+ "eh_func_begin", EHFrameInfo.Number, true);
+ EOL("FDE address range");
+
+ // If there is a personality and landing pads then point to the language
+ // specific data area in the exception table.
+ if (MMI->getPersonalities()[0] != NULL) {
+
+ if (Asm->TM.getLSDAEncoding() != DwarfLSDAEncoding::EightByte) {
+ EmitULEB128(4, "Augmentation size");
+
+ if (EHFrameInfo.hasLandingPads)
+ EmitReference("exception", EHFrameInfo.Number, true, true);
+ else
+ Asm->OutStreamer.EmitIntValue(0, 4/*size*/, 0/*addrspace*/);
+ } else {
+ EmitULEB128(TD->getPointerSize(), "Augmentation size");
+
+ if (EHFrameInfo.hasLandingPads) {
+ EmitReference("exception", EHFrameInfo.Number, true, false);
+ } else {
+ Asm->OutStreamer.EmitIntValue(0, TD->getPointerSize(),
+ 0/*addrspace*/);
+ }
+ }
+
+ EOL("Language Specific Data Area");
+ } else {
+ EmitULEB128(0, "Augmentation size");
+ }
+
+ // Indicate locations of function specific callee saved registers in frame.
+ EmitFrameMoves("eh_func_begin", EHFrameInfo.Number, EHFrameInfo.Moves,
+ true);
+
+ // On Darwin the linker honors the alignment of eh_frame, which means it
+ // must be 8-byte on 64-bit targets to match what gcc does. Otherwise you
+ // get holes which confuse readers of eh_frame.
+ Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
+ 0, 0, false);
+ EmitLabel("eh_frame_end", EHFrameInfo.Number);
+
+ // If the function is marked used, this table should be also. We cannot
+ // make the mark unconditional in this case, since retaining the table also
+ // retains the function in this case, and there is code around that depends
+ // on unused functions (calling undefined externals) being dead-stripped to
+ // link correctly. Yes, there really is.
+ if (MMI->isUsedFunction(EHFrameInfo.function))
+ if (MAI->hasNoDeadStrip())
+ Asm->OutStreamer.EmitSymbolAttribute(EHFrameInfo.FunctionEHSym,
+ MCSA_NoDeadStrip);
+ }
+ Asm->O << '\n';
+}
+
+/// SharedTypeIds - How many leading type ids two landing pads have in common.
+unsigned DwarfException::SharedTypeIds(const LandingPadInfo *L,
+ const LandingPadInfo *R) {
+ const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
+ unsigned LSize = LIds.size(), RSize = RIds.size();
+ unsigned MinSize = LSize < RSize ? LSize : RSize;
+ unsigned Count = 0;
+
+ for (; Count != MinSize; ++Count)
+ if (LIds[Count] != RIds[Count])
+ return Count;
+
+ return Count;
+}
+
+/// PadLT - Order landing pads lexicographically by type id.
+bool DwarfException::PadLT(const LandingPadInfo *L, const LandingPadInfo *R) {
+ const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
+ unsigned LSize = LIds.size(), RSize = RIds.size();
+ unsigned MinSize = LSize < RSize ? LSize : RSize;
+
+ for (unsigned i = 0; i != MinSize; ++i)
+ if (LIds[i] != RIds[i])
+ return LIds[i] < RIds[i];
+
+ return LSize < RSize;
+}
+
+/// ComputeActionsTable - Compute the actions table and gather the first action
+/// index for each landing pad site.
+unsigned DwarfException::
+ComputeActionsTable(const SmallVectorImpl<const LandingPadInfo*> &LandingPads,
+ SmallVectorImpl<ActionEntry> &Actions,
+ SmallVectorImpl<unsigned> &FirstActions) {
+
+ // The action table follows the call-site table in the LSDA. The individual
+ // records are of two types:
+ //
+ // * Catch clause
+ // * Exception specification
+ //
+ // The two record kinds have the same format, with only small differences.
+ // They are distinguished by the "switch value" field: Catch clauses
+ // (TypeInfos) have strictly positive switch values, and exception
+ // specifications (FilterIds) have strictly negative switch values. Value 0
+ // indicates a catch-all clause.
+ //
+ // Negative type IDs index into FilterIds. Positive type IDs index into
+ // TypeInfos. The value written for a positive type ID is just the type ID
+ // itself. For a negative type ID, however, the value written is the
+ // (negative) byte offset of the corresponding FilterIds entry. The byte
+ // offset is usually equal to the type ID (because the FilterIds entries are
+ // written using a variable width encoding, which outputs one byte per entry
+ // as long as the value written is not too large) but can differ. This kind
+ // of complication does not occur for positive type IDs because type infos are
+ // output using a fixed width encoding. FilterOffsets[i] holds the byte
+ // offset corresponding to FilterIds[i].
+
+ const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
+ SmallVector<int, 16> FilterOffsets;
+ FilterOffsets.reserve(FilterIds.size());
+ int Offset = -1;
+
+ for (std::vector<unsigned>::const_iterator
+ I = FilterIds.begin(), E = FilterIds.end(); I != E; ++I) {
+ FilterOffsets.push_back(Offset);
+ Offset -= MCAsmInfo::getULEB128Size(*I);
+ }
+
+ FirstActions.reserve(LandingPads.size());
+
+ int FirstAction = 0;
+ unsigned SizeActions = 0;
+ const LandingPadInfo *PrevLPI = 0;
+
+ for (SmallVectorImpl<const LandingPadInfo *>::const_iterator
+ I = LandingPads.begin(), E = LandingPads.end(); I != E; ++I) {
+ const LandingPadInfo *LPI = *I;
+ const std::vector<int> &TypeIds = LPI->TypeIds;
+ const unsigned NumShared = PrevLPI ? SharedTypeIds(LPI, PrevLPI) : 0;
+ unsigned SizeSiteActions = 0;
+
+ if (NumShared < TypeIds.size()) {
+ unsigned SizeAction = 0;
+ ActionEntry *PrevAction = 0;
+
+ if (NumShared) {
+ const unsigned SizePrevIds = PrevLPI->TypeIds.size();
+ assert(Actions.size());
+ PrevAction = &Actions.back();
+ SizeAction = MCAsmInfo::getSLEB128Size(PrevAction->NextAction) +
+ MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
+
+ for (unsigned j = NumShared; j != SizePrevIds; ++j) {
+ SizeAction -=
+ MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
+ SizeAction += -PrevAction->NextAction;
+ PrevAction = PrevAction->Previous;
+ }
+ }
+
+ // Compute the actions.
+ for (unsigned J = NumShared, M = TypeIds.size(); J != M; ++J) {
+ int TypeID = TypeIds[J];
+ assert(-1 - TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
+ int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
+ unsigned SizeTypeID = MCAsmInfo::getSLEB128Size(ValueForTypeID);
+
+ int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
+ SizeAction = SizeTypeID + MCAsmInfo::getSLEB128Size(NextAction);
+ SizeSiteActions += SizeAction;
+
+ ActionEntry Action = { ValueForTypeID, NextAction, PrevAction };
+ Actions.push_back(Action);
+ PrevAction = &Actions.back();
+ }
+
+ // Record the first action of the landing pad site.
+ FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
+ } // else identical - re-use previous FirstAction
+
+ // Information used when created the call-site table. The action record
+ // field of the call site record is the offset of the first associated
+ // action record, relative to the start of the actions table. This value is
+ // biased by 1 (1 in dicating the start of the actions table), and 0
+ // indicates that there are no actions.
+ FirstActions.push_back(FirstAction);
+
+ // Compute this sites contribution to size.
+ SizeActions += SizeSiteActions;
+
+ PrevLPI = LPI;
+ }
+
+ return SizeActions;
+}
+
+/// CallToNoUnwindFunction - Return `true' if this is a call to a function
+/// marked `nounwind'. Return `false' otherwise.
+bool DwarfException::CallToNoUnwindFunction(const MachineInstr *MI) {
+ assert(MI->getDesc().isCall() && "This should be a call instruction!");
+
+ bool MarkedNoUnwind = false;
+ bool SawFunc = false;
+
+ for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
+ const MachineOperand &MO = MI->getOperand(I);
+
+ if (MO.isGlobal()) {
+ if (Function *F = dyn_cast<Function>(MO.getGlobal())) {
+ if (SawFunc) {
+ // Be conservative. If we have more than one function operand for this
+ // call, then we can't make the assumption that it's the callee and
+ // not a parameter to the call.
+ //
+ // FIXME: Determine if there's a way to say that `F' is the callee or
+ // parameter.
+ MarkedNoUnwind = false;
+ break;
+ }
+
+ MarkedNoUnwind = F->doesNotThrow();
+ SawFunc = true;
+ }
+ }
+ }
+
+ return MarkedNoUnwind;
+}
+
+/// ComputeCallSiteTable - Compute the call-site table. The entry for an invoke
+/// has a try-range containing the call, a non-zero landing pad, and an
+/// appropriate action. The entry for an ordinary call has a try-range
+/// containing the call and zero for the landing pad and the action. Calls
+/// marked 'nounwind' have no entry and must not be contained in the try-range
+/// of any entry - they form gaps in the table. Entries must be ordered by
+/// try-range address.
+void DwarfException::
+ComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
+ const RangeMapType &PadMap,
+ const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
+ const SmallVectorImpl<unsigned> &FirstActions) {
+ // The end label of the previous invoke or nounwind try-range.
+ unsigned LastLabel = 0;
+
+ // Whether there is a potentially throwing instruction (currently this means
+ // an ordinary call) between the end of the previous try-range and now.
+ bool SawPotentiallyThrowing = false;
+
+ // Whether the last CallSite entry was for an invoke.
+ bool PreviousIsInvoke = false;
+
+ // Visit all instructions in order of address.
+ for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
+ I != E; ++I) {
+ for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
+ MI != E; ++MI) {
+ if (!MI->isLabel()) {
+ if (MI->getDesc().isCall())
+ SawPotentiallyThrowing |= !CallToNoUnwindFunction(MI);
+
+ continue;
+ }
+
+ unsigned BeginLabel = MI->getOperand(0).getImm();
+ assert(BeginLabel && "Invalid label!");
+
+ // End of the previous try-range?
+ if (BeginLabel == LastLabel)
+ SawPotentiallyThrowing = false;
+
+ // Beginning of a new try-range?
+ RangeMapType::const_iterator L = PadMap.find(BeginLabel);
+ if (L == PadMap.end())
+ // Nope, it was just some random label.
+ continue;
+
+ const PadRange &P = L->second;
+ const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
+ assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
+ "Inconsistent landing pad map!");
+
+ // For Dwarf exception handling (SjLj handling doesn't use this). If some
+ // instruction between the previous try-range and this one may throw,
+ // create a call-site entry with no landing pad for the region between the
+ // try-ranges.
+ if (SawPotentiallyThrowing &&
+ MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) {
+ CallSiteEntry Site = { LastLabel, BeginLabel, 0, 0 };
+ CallSites.push_back(Site);
+ PreviousIsInvoke = false;
+ }
+
+ LastLabel = LandingPad->EndLabels[P.RangeIndex];
+ assert(BeginLabel && LastLabel && "Invalid landing pad!");
+
+ if (LandingPad->LandingPadLabel) {
+ // This try-range is for an invoke.
+ CallSiteEntry Site = {
+ BeginLabel,
+ LastLabel,
+ LandingPad->LandingPadLabel,
+ FirstActions[P.PadIndex]
+ };
+
+ // Try to merge with the previous call-site. SJLJ doesn't do this
+ if (PreviousIsInvoke &&
+ MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) {
+ CallSiteEntry &Prev = CallSites.back();
+ if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
+ // Extend the range of the previous entry.
+ Prev.EndLabel = Site.EndLabel;
+ continue;
+ }
+ }
+
+ // Otherwise, create a new call-site.
+ if (MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf)
+ CallSites.push_back(Site);
+ else {
+ // SjLj EH must maintain the call sites in the order assigned
+ // to them by the SjLjPrepare pass.
+ unsigned SiteNo = MMI->getCallSiteBeginLabel(BeginLabel);
+ if (CallSites.size() < SiteNo)
+ CallSites.resize(SiteNo);
+ CallSites[SiteNo - 1] = Site;
+ }
+ PreviousIsInvoke = true;
+ } else {
+ // Create a gap.
+ PreviousIsInvoke = false;
+ }
+ }
+ }
+
+ // If some instruction between the previous try-range and the end of the
+ // function may throw, create a call-site entry with no landing pad for the
+ // region following the try-range.
+ if (SawPotentiallyThrowing &&
+ MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) {
+ CallSiteEntry Site = { LastLabel, 0, 0, 0 };
+ CallSites.push_back(Site);
+ }
+}
+
+/// EmitExceptionTable - Emit landing pads and actions.
+///
+/// The general organization of the table is complex, but the basic concepts are
+/// easy. First there is a header which describes the location and organization
+/// of the three components that follow.
+///
+/// 1. The landing pad site information describes the range of code covered by
+/// the try. In our case it's an accumulation of the ranges covered by the
+/// invokes in the try. There is also a reference to the landing pad that
+/// handles the exception once processed. Finally an index into the actions
+/// table.
+/// 2. The action table, in our case, is composed of pairs of type IDs and next
+/// action offset. Starting with the action index from the landing pad
+/// site, each type ID is checked for a match to the current exception. If
+/// it matches then the exception and type id are passed on to the landing
+/// pad. Otherwise the next action is looked up. This chain is terminated
+/// with a next action of zero. If no type id is found then the frame is
+/// unwound and handling continues.
+/// 3. Type ID table contains references to all the C++ typeinfo for all
+/// catches in the function. This tables is reverse indexed base 1.
+void DwarfException::EmitExceptionTable() {
+ const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
+ const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
+ const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
+ if (PadInfos.empty()) return;
+
+ // Sort the landing pads in order of their type ids. This is used to fold
+ // duplicate actions.
+ SmallVector<const LandingPadInfo *, 64> LandingPads;
+ LandingPads.reserve(PadInfos.size());
+
+ for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
+ LandingPads.push_back(&PadInfos[i]);
+
+ std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
+
+ // Compute the actions table and gather the first action index for each
+ // landing pad site.
+ SmallVector<ActionEntry, 32> Actions;
+ SmallVector<unsigned, 64> FirstActions;
+ unsigned SizeActions = ComputeActionsTable(LandingPads, Actions,
+ FirstActions);
+
+ // Invokes and nounwind calls have entries in PadMap (due to being bracketed
+ // by try-range labels when lowered). Ordinary calls do not, so appropriate
+ // try-ranges for them need be deduced when using DWARF exception handling.
+ RangeMapType PadMap;
+ for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
+ const LandingPadInfo *LandingPad = LandingPads[i];
+ for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
+ unsigned BeginLabel = LandingPad->BeginLabels[j];
+ assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
+ PadRange P = { i, j };
+ PadMap[BeginLabel] = P;
+ }
+ }
+
+ // Compute the call-site table.
+ SmallVector<CallSiteEntry, 64> CallSites;
+ ComputeCallSiteTable(CallSites, PadMap, LandingPads, FirstActions);
+
+ // Final tallies.
+
+ // Call sites.
+ const unsigned SiteStartSize = SizeOfEncodedValue(dwarf::DW_EH_PE_udata4);
+ const unsigned SiteLengthSize = SizeOfEncodedValue(dwarf::DW_EH_PE_udata4);
+ const unsigned LandingPadSize = SizeOfEncodedValue(dwarf::DW_EH_PE_udata4);
+ bool IsSJLJ = MAI->getExceptionHandlingType() == ExceptionHandling::SjLj;
+ bool HaveTTData = IsSJLJ ? (!TypeInfos.empty() || !FilterIds.empty()) : true;
+ unsigned SizeSites;
+
+ if (IsSJLJ)
+ SizeSites = 0;
+ else
+ SizeSites = CallSites.size() *
+ (SiteStartSize + SiteLengthSize + LandingPadSize);
+
+ for (unsigned i = 0, e = CallSites.size(); i < e; ++i) {
+ SizeSites += MCAsmInfo::getULEB128Size(CallSites[i].Action);
+ if (IsSJLJ)
+ SizeSites += MCAsmInfo::getULEB128Size(i);
+ }
+
+ // Type infos.
+ const MCSection *LSDASection = Asm->getObjFileLowering().getLSDASection();
+ unsigned TTypeFormat;
+ unsigned TypeFormatSize;
+
+ if (!HaveTTData) {
+ // For SjLj exceptions, if there is no TypeInfo, then we just explicitly say
+ // that we're omitting that bit.
+ TTypeFormat = dwarf::DW_EH_PE_omit;
+ TypeFormatSize = SizeOfEncodedValue(dwarf::DW_EH_PE_absptr);
+ } else {
+ // Okay, we have actual filters or typeinfos to emit. As such, we need to
+ // pick a type encoding for them. We're about to emit a list of pointers to
+ // typeinfo objects at the end of the LSDA. However, unless we're in static
+ // mode, this reference will require a relocation by the dynamic linker.
+ //
+ // Because of this, we have a couple of options:
+ //
+ // 1) If we are in -static mode, we can always use an absolute reference
+ // from the LSDA, because the static linker will resolve it.
+ //
+ // 2) Otherwise, if the LSDA section is writable, we can output the direct
+ // reference to the typeinfo and allow the dynamic linker to relocate
+ // it. Since it is in a writable section, the dynamic linker won't
+ // have a problem.
+ //
+ // 3) Finally, if we're in PIC mode and the LDSA section isn't writable,
+ // we need to use some form of indirection. For example, on Darwin,
+ // we can output a statically-relocatable reference to a dyld stub. The
+ // offset to the stub is constant, but the contents are in a section
+ // that is updated by the dynamic linker. This is easy enough, but we
+ // need to tell the personality function of the unwinder to indirect
+ // through the dyld stub.
+ //
+ // FIXME: When (3) is actually implemented, we'll have to emit the stubs
+ // somewhere. This predicate should be moved to a shared location that is
+ // in target-independent code.
+ //
+ if (LSDASection->getKind().isWriteable() ||
+ Asm->TM.getRelocationModel() == Reloc::Static)
+ TTypeFormat = dwarf::DW_EH_PE_absptr;
+ else
+ TTypeFormat = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
+ dwarf::DW_EH_PE_sdata4;
+
+ TypeFormatSize = SizeOfEncodedValue(TTypeFormat);
+ }
+
+ // Begin the exception table.
+ Asm->OutStreamer.SwitchSection(LSDASection);
+ Asm->EmitAlignment(2, 0, 0, false);
+
+ O << "GCC_except_table" << SubprogramCount << ":\n";
+
+ // The type infos need to be aligned. GCC does this by inserting padding just
+ // before the type infos. However, this changes the size of the exception
+ // table, so you need to take this into account when you output the exception
+ // table size. However, the size is output using a variable length encoding.
+ // So by increasing the size by inserting padding, you may increase the number
+ // of bytes used for writing the size. If it increases, say by one byte, then
+ // you now need to output one less byte of padding to get the type infos
+ // aligned. However this decreases the size of the exception table. This
+ // changes the value you have to output for the exception table size. Due to
+ // the variable length encoding, the number of bytes used for writing the
+ // length may decrease. If so, you then have to increase the amount of
+ // padding. And so on. If you look carefully at the GCC code you will see that
+ // it indeed does this in a loop, going on and on until the values stabilize.
+ // We chose another solution: don't output padding inside the table like GCC
+ // does, instead output it before the table.
+ unsigned SizeTypes = TypeInfos.size() * TypeFormatSize;
+ unsigned TyOffset = sizeof(int8_t) + // Call site format
+ MCAsmInfo::getULEB128Size(SizeSites) + // Call site table length
+ SizeSites + SizeActions + SizeTypes;
+ unsigned TotalSize = sizeof(int8_t) + // LPStart format
+ sizeof(int8_t) + // TType format
+ (HaveTTData ?
+ MCAsmInfo::getULEB128Size(TyOffset) : 0) + // TType base offset
+ TyOffset;
+ unsigned SizeAlign = (4 - TotalSize) & 3;
+
+ for (unsigned i = 0; i != SizeAlign; ++i) {
+ Asm->EmitInt8(0);
+ EOL("Padding");
+ }
+
+ EmitLabel("exception", SubprogramCount);
+
+ if (IsSJLJ) {
+ SmallString<16> LSDAName;
+ raw_svector_ostream(LSDAName) << MAI->getPrivateGlobalPrefix() <<
+ "_LSDA_" << Asm->getFunctionNumber();
+ O << LSDAName.str() << ":\n";
+ }
+
+ // Emit the header.
+ EmitEncodingByte(dwarf::DW_EH_PE_omit, "@LPStart");
+ EmitEncodingByte(TTypeFormat, "@TType");
+
+ if (HaveTTData)
+ EmitULEB128(TyOffset, "@TType base offset");
+
+ // SjLj Exception handling
+ if (IsSJLJ) {
+ EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
+ EmitULEB128(SizeSites, "Call site table length");
+
+ // Emit the landing pad site information.
+ unsigned idx = 0;
+ for (SmallVectorImpl<CallSiteEntry>::const_iterator
+ I = CallSites.begin(), E = CallSites.end(); I != E; ++I, ++idx) {
+ const CallSiteEntry &S = *I;
+
+ // Offset of the landing pad, counted in 16-byte bundles relative to the
+ // @LPStart address.
+ EmitULEB128(idx, "Landing pad");
+
+ // Offset of the first associated action record, relative to the start of
+ // the action table. This value is biased by 1 (1 indicates the start of
+ // the action table), and 0 indicates that there are no actions.
+ EmitULEB128(S.Action, "Action");
+ }
+ } else {
+ // DWARF Exception handling
+ assert(MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf);
+
+ // The call-site table is a list of all call sites that may throw an
+ // exception (including C++ 'throw' statements) in the procedure
+ // fragment. It immediately follows the LSDA header. Each entry indicates,
+ // for a given call, the first corresponding action record and corresponding
+ // landing pad.
+ //
+ // The table begins with the number of bytes, stored as an LEB128
+ // compressed, unsigned integer. The records immediately follow the record
+ // count. They are sorted in increasing call-site address. Each record
+ // indicates:
+ //
+ // * The position of the call-site.
+ // * The position of the landing pad.
+ // * The first action record for that call site.
+ //
+ // A missing entry in the call-site table indicates that a call is not
+ // supposed to throw.
+
+ // Emit the landing pad call site table.
+ EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
+ EmitULEB128(SizeSites, "Call site table length");
+
+ for (SmallVectorImpl<CallSiteEntry>::const_iterator
+ I = CallSites.begin(), E = CallSites.end(); I != E; ++I) {
+ const CallSiteEntry &S = *I;
+ const char *BeginTag;
+ unsigned BeginNumber;
+
+ if (!S.BeginLabel) {
+ BeginTag = "eh_func_begin";
+ BeginNumber = SubprogramCount;
+ } else {
+ BeginTag = "label";
+ BeginNumber = S.BeginLabel;
+ }
+
+ // Offset of the call site relative to the previous call site, counted in
+ // number of 16-byte bundles. The first call site is counted relative to
+ // the start of the procedure fragment.
+ EmitSectionOffset(BeginTag, "eh_func_begin", BeginNumber, SubprogramCount,
+ true, true);
+ EOL("Region start");
+
+ if (!S.EndLabel)
+ EmitDifference("eh_func_end", SubprogramCount, BeginTag, BeginNumber,
+ true);
+ else
+ EmitDifference("label", S.EndLabel, BeginTag, BeginNumber, true);
+
+ EOL("Region length");
+
+ // Offset of the landing pad, counted in 16-byte bundles relative to the
+ // @LPStart address.
+ if (!S.PadLabel) {
+ Asm->OutStreamer.AddComment("Landing pad");
+ Asm->OutStreamer.EmitIntValue(0, 4/*size*/, 0/*addrspace*/);
+ } else {
+ EmitSectionOffset("label", "eh_func_begin", S.PadLabel, SubprogramCount,
+ true, true);
+ EOL("Landing pad");
+ }
+
+ // Offset of the first associated action record, relative to the start of
+ // the action table. This value is biased by 1 (1 indicates the start of
+ // the action table), and 0 indicates that there are no actions.
+ EmitULEB128(S.Action, "Action");
+ }
+ }
+
+ // Emit the Action Table.
+ if (Actions.size() != 0) EOL("-- Action Record Table --");
+ for (SmallVectorImpl<ActionEntry>::const_iterator
+ I = Actions.begin(), E = Actions.end(); I != E; ++I) {
+ const ActionEntry &Action = *I;
+ EOL("Action Record:");
+
+ // Type Filter
+ //
+ // Used by the runtime to match the type of the thrown exception to the
+ // type of the catch clauses or the types in the exception specification.
+ EmitSLEB128(Action.ValueForTypeID, " TypeInfo index");
+
+ // Action Record
+ //
+ // Self-relative signed displacement in bytes of the next action record,
+ // or 0 if there is no next action record.
+ EmitSLEB128(Action.NextAction, " Next action");
+ }
+
+ // Emit the Catch TypeInfos.
+ if (TypeInfos.size() != 0) EOL("-- Catch TypeInfos --");
+ for (std::vector<GlobalVariable *>::const_reverse_iterator
+ I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) {
+ const GlobalVariable *GV = *I;
+ PrintRelDirective();
+
+ if (GV) {
+ O << *Asm->GetGlobalValueSymbol(GV);
+ EOL("TypeInfo");
+ } else {
+ O << "0x0";
+ EOL("");
+ }
+ }
+
+ // Emit the Exception Specifications.
+ if (FilterIds.size() != 0) EOL("-- Filter IDs --");
+ for (std::vector<unsigned>::const_iterator
+ I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
+ unsigned TypeID = *I;
+ EmitULEB128(TypeID, TypeID != 0 ? "Exception specification" : 0);
+ }
+
+ Asm->EmitAlignment(2, 0, 0, false);
+}
+
+/// EndModule - Emit all exception information that should come after the
+/// content.
+void DwarfException::EndModule() {
+ if (MAI->getExceptionHandlingType() != ExceptionHandling::Dwarf)
+ return;
+
+ if (!shouldEmitMovesModule && !shouldEmitTableModule)
+ return;
+
+ if (TimePassesIsEnabled)
+ ExceptionTimer->startTimer();
+
+ const std::vector<Function *> Personalities = MMI->getPersonalities();
+
+ for (unsigned I = 0, E = Personalities.size(); I < E; ++I)
+ EmitCIE(Personalities[I], I);
+
+ for (std::vector<FunctionEHFrameInfo>::iterator
+ I = EHFrames.begin(), E = EHFrames.end(); I != E; ++I)
+ EmitFDE(*I);
+
+ if (TimePassesIsEnabled)
+ ExceptionTimer->stopTimer();
+}
+
+/// BeginFunction - Gather pre-function exception information. Assumes it's
+/// being emitted immediately after the function entry point.
+void DwarfException::BeginFunction(const MachineFunction *MF) {
+ if (!MMI || !MAI->doesSupportExceptionHandling()) return;
+
+ if (TimePassesIsEnabled)
+ ExceptionTimer->startTimer();
+
+ this->MF = MF;
+ shouldEmitTable = shouldEmitMoves = false;
+
+ // Map all labels and get rid of any dead landing pads.
+ MMI->TidyLandingPads();
+
+ // If any landing pads survive, we need an EH table.
+ if (!MMI->getLandingPads().empty())
+ shouldEmitTable = true;
+
+ // See if we need frame move info.
+ if (!MF->getFunction()->doesNotThrow() || UnwindTablesMandatory)
+ shouldEmitMoves = true;
+
+ if (shouldEmitMoves || shouldEmitTable)
+ // Assumes in correct section after the entry point.
+ EmitLabel("eh_func_begin", ++SubprogramCount);
+
+ shouldEmitTableModule |= shouldEmitTable;
+ shouldEmitMovesModule |= shouldEmitMoves;
+
+ if (TimePassesIsEnabled)
+ ExceptionTimer->stopTimer();
+}
+
+/// EndFunction - Gather and emit post-function exception information.
+///
+void DwarfException::EndFunction() {
+ if (!shouldEmitMoves && !shouldEmitTable) return;
+
+ if (TimePassesIsEnabled)
+ ExceptionTimer->startTimer();
+
+ EmitLabel("eh_func_end", SubprogramCount);
+ EmitExceptionTable();
+
+ MCSymbol *FunctionEHSym =
+ Asm->GetSymbolWithGlobalValueBase(MF->getFunction(), ".eh",
+ Asm->MAI->is_EHSymbolPrivate());
+
+ // Save EH frame information
+ EHFrames.push_back(FunctionEHFrameInfo(FunctionEHSym, SubprogramCount,
+ MMI->getPersonalityIndex(),
+ MF->getFrameInfo()->hasCalls(),
+ !MMI->getLandingPads().empty(),
+ MMI->getFrameMoves(),
+ MF->getFunction()));
+
+ // Record if this personality index uses a landing pad.
+ UsesLSDA[MMI->getPersonalityIndex()] |= !MMI->getLandingPads().empty();
+
+ if (TimePassesIsEnabled)
+ ExceptionTimer->stopTimer();
+}
diff --git a/lib/CodeGen/AsmPrinter/DwarfException.h b/lib/CodeGen/AsmPrinter/DwarfException.h
new file mode 100644
index 0000000..06033a1
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfException.h
@@ -0,0 +1,208 @@
+//===-- DwarfException.h - Dwarf Exception Framework -----------*- C++ -*--===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing dwarf exception info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
+#define LLVM_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
+
+#include "DIE.h"
+#include "DwarfPrinter.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/ADT/DenseMap.h"
+#include <string>
+
+namespace llvm {
+
+struct LandingPadInfo;
+class MachineModuleInfo;
+class MCAsmInfo;
+class MCExpr;
+class Timer;
+class raw_ostream;
+
+//===----------------------------------------------------------------------===//
+/// DwarfException - Emits Dwarf exception handling directives.
+///
+class DwarfException : public DwarfPrinter {
+ struct FunctionEHFrameInfo {
+ MCSymbol *FunctionEHSym; // L_foo.eh
+ unsigned Number;
+ unsigned PersonalityIndex;
+ bool hasCalls;
+ bool hasLandingPads;
+ std::vector<MachineMove> Moves;
+ const Function *function;
+
+ FunctionEHFrameInfo(MCSymbol *EHSym, unsigned Num, unsigned P,
+ bool hC, bool hL,
+ const std::vector<MachineMove> &M,
+ const Function *f):
+ FunctionEHSym(EHSym), Number(Num), PersonalityIndex(P),
+ hasCalls(hC), hasLandingPads(hL), Moves(M), function (f) { }
+ };
+
+ std::vector<FunctionEHFrameInfo> EHFrames;
+
+ /// UsesLSDA - Indicates whether an FDE that uses the CIE at the given index
+ /// uses an LSDA. If so, then we need to encode that information in the CIE's
+ /// augmentation.
+ DenseMap<unsigned, bool> UsesLSDA;
+
+ /// shouldEmitTable - Per-function flag to indicate if EH tables should
+ /// be emitted.
+ bool shouldEmitTable;
+
+ /// shouldEmitMoves - Per-function flag to indicate if frame moves info
+ /// should be emitted.
+ bool shouldEmitMoves;
+
+ /// shouldEmitTableModule - Per-module flag to indicate if EH tables
+ /// should be emitted.
+ bool shouldEmitTableModule;
+
+ /// shouldEmitFrameModule - Per-module flag to indicate if frame moves
+ /// should be emitted.
+ bool shouldEmitMovesModule;
+
+ /// ExceptionTimer - Timer for the Dwarf exception writer.
+ Timer *ExceptionTimer;
+
+ /// SizeOfEncodedValue - Return the size of the encoding in bytes.
+ unsigned SizeOfEncodedValue(unsigned Encoding);
+
+ /// EmitCIE - Emit a Common Information Entry (CIE). This holds information
+ /// that is shared among many Frame Description Entries. There is at least
+ /// one CIE in every non-empty .debug_frame section.
+ void EmitCIE(const Function *Personality, unsigned Index);
+
+ /// EmitFDE - Emit the Frame Description Entry (FDE) for the function.
+ void EmitFDE(const FunctionEHFrameInfo &EHFrameInfo);
+
+ /// EmitExceptionTable - Emit landing pads and actions.
+ ///
+ /// The general organization of the table is complex, but the basic concepts
+ /// are easy. First there is a header which describes the location and
+ /// organization of the three components that follow.
+ /// 1. The landing pad site information describes the range of code covered
+ /// by the try. In our case it's an accumulation of the ranges covered
+ /// by the invokes in the try. There is also a reference to the landing
+ /// pad that handles the exception once processed. Finally an index into
+ /// the actions table.
+ /// 2. The action table, in our case, is composed of pairs of type ids
+ /// and next action offset. Starting with the action index from the
+ /// landing pad site, each type Id is checked for a match to the current
+ /// exception. If it matches then the exception and type id are passed
+ /// on to the landing pad. Otherwise the next action is looked up. This
+ /// chain is terminated with a next action of zero. If no type id is
+ /// found the frame is unwound and handling continues.
+ /// 3. Type id table contains references to all the C++ typeinfo for all
+ /// catches in the function. This tables is reversed indexed base 1.
+
+ /// SharedTypeIds - How many leading type ids two landing pads have in common.
+ static unsigned SharedTypeIds(const LandingPadInfo *L,
+ const LandingPadInfo *R);
+
+ /// PadLT - Order landing pads lexicographically by type id.
+ static bool PadLT(const LandingPadInfo *L, const LandingPadInfo *R);
+
+ struct KeyInfo {
+ static inline unsigned getEmptyKey() { return -1U; }
+ static inline unsigned getTombstoneKey() { return -2U; }
+ static unsigned getHashValue(const unsigned &Key) { return Key; }
+ static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
+ };
+
+ /// PadRange - Structure holding a try-range and the associated landing pad.
+ struct PadRange {
+ // The index of the landing pad.
+ unsigned PadIndex;
+ // The index of the begin and end labels in the landing pad's label lists.
+ unsigned RangeIndex;
+ };
+
+ typedef DenseMap<unsigned, PadRange, KeyInfo> RangeMapType;
+
+ /// ActionEntry - Structure describing an entry in the actions table.
+ struct ActionEntry {
+ int ValueForTypeID; // The value to write - may not be equal to the type id.
+ int NextAction;
+ struct ActionEntry *Previous;
+ };
+
+ /// CallSiteEntry - Structure describing an entry in the call-site table.
+ struct CallSiteEntry {
+ // The 'try-range' is BeginLabel .. EndLabel.
+ unsigned BeginLabel; // zero indicates the start of the function.
+ unsigned EndLabel; // zero indicates the end of the function.
+
+ // The landing pad starts at PadLabel.
+ unsigned PadLabel; // zero indicates that there is no landing pad.
+ unsigned Action;
+ };
+
+ /// ComputeActionsTable - Compute the actions table and gather the first
+ /// action index for each landing pad site.
+ unsigned ComputeActionsTable(const SmallVectorImpl<const LandingPadInfo*>&LPs,
+ SmallVectorImpl<ActionEntry> &Actions,
+ SmallVectorImpl<unsigned> &FirstActions);
+
+ /// CallToNoUnwindFunction - Return `true' if this is a call to a function
+ /// marked `nounwind'. Return `false' otherwise.
+ bool CallToNoUnwindFunction(const MachineInstr *MI);
+
+ /// ComputeCallSiteTable - Compute the call-site table. The entry for an
+ /// invoke has a try-range containing the call, a non-zero landing pad and an
+ /// appropriate action. The entry for an ordinary call has a try-range
+ /// containing the call and zero for the landing pad and the action. Calls
+ /// marked 'nounwind' have no entry and must not be contained in the try-range
+ /// of any entry - they form gaps in the table. Entries must be ordered by
+ /// try-range address.
+ void ComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
+ const RangeMapType &PadMap,
+ const SmallVectorImpl<const LandingPadInfo *> &LPs,
+ const SmallVectorImpl<unsigned> &FirstActions);
+ void EmitExceptionTable();
+
+ /// CreateLabelDiff - Emit a label and subtract it from the expression we
+ /// already have. This is equivalent to emitting "foo - .", but we have to
+ /// emit the label for "." directly.
+ const MCExpr *CreateLabelDiff(const MCExpr *ExprRef, const char *LabelName,
+ unsigned Index);
+public:
+ //===--------------------------------------------------------------------===//
+ // Main entry points.
+ //
+ DwarfException(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T);
+ virtual ~DwarfException();
+
+ /// BeginModule - Emit all exception information that should come prior to the
+ /// content.
+ void BeginModule(Module *m, MachineModuleInfo *mmi) {
+ this->M = m;
+ this->MMI = mmi;
+ }
+
+ /// EndModule - Emit all exception information that should come after the
+ /// content.
+ void EndModule();
+
+ /// BeginFunction - Gather pre-function exception information. Assumes being
+ /// emitted immediately after the function entry point.
+ void BeginFunction(const MachineFunction *MF);
+
+ /// EndFunction - Gather and emit post-function exception information.
+ void EndFunction();
+};
+
+} // End of namespace llvm
+
+#endif
diff --git a/lib/CodeGen/AsmPrinter/DwarfLabel.cpp b/lib/CodeGen/AsmPrinter/DwarfLabel.cpp
new file mode 100644
index 0000000..6e9293a
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfLabel.cpp
@@ -0,0 +1,32 @@
+//===--- lib/CodeGen/DwarfLabel.cpp - Dwarf Label -------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// DWARF Labels
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfLabel.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+/// Profile - Used to gather unique data for the folding set.
+///
+void DWLabel::Profile(FoldingSetNodeID &ID) const {
+ ID.AddString(Tag);
+ ID.AddInteger(Number);
+}
+
+#ifndef NDEBUG
+void DWLabel::print(raw_ostream &O) const {
+ O << "." << Tag;
+ if (Number) O << Number;
+}
+#endif
diff --git a/lib/CodeGen/AsmPrinter/DwarfLabel.h b/lib/CodeGen/AsmPrinter/DwarfLabel.h
new file mode 100644
index 0000000..0c0cc4b
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfLabel.h
@@ -0,0 +1,52 @@
+//===--- lib/CodeGen/DwarfLabel.h - Dwarf Label -----------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// DWARF Labels.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CODEGEN_ASMPRINTER_DWARFLABEL_H__
+#define CODEGEN_ASMPRINTER_DWARFLABEL_H__
+
+namespace llvm {
+ class FoldingSetNodeID;
+ class raw_ostream;
+
+ //===--------------------------------------------------------------------===//
+ /// DWLabel - Labels are used to track locations in the assembler file.
+ /// Labels appear in the form @verbatim <prefix><Tag><Number> @endverbatim,
+ /// where the tag is a category of label (Ex. location) and number is a value
+ /// unique in that category.
+ class DWLabel {
+ /// Tag - Label category tag. Should always be a statically declared C
+ /// string.
+ ///
+ const char *Tag;
+
+ /// Number - Value to make label unique.
+ ///
+ unsigned Number;
+ public:
+ DWLabel(const char *T, unsigned N) : Tag(T), Number(N) {}
+
+ // Accessors.
+ const char *getTag() const { return Tag; }
+ unsigned getNumber() const { return Number; }
+
+ /// Profile - Used to gather unique data for the folding set.
+ ///
+ void Profile(FoldingSetNodeID &ID) const;
+
+#ifndef NDEBUG
+ void print(raw_ostream &O) const;
+#endif
+ };
+} // end llvm namespace
+
+#endif
diff --git a/lib/CodeGen/AsmPrinter/DwarfPrinter.cpp b/lib/CodeGen/AsmPrinter/DwarfPrinter.cpp
new file mode 100644
index 0000000..415390b
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfPrinter.cpp
@@ -0,0 +1,341 @@
+//===--- lib/CodeGen/DwarfPrinter.cpp - Dwarf Printer ---------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Emit general DWARF directives.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfPrinter.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetFrameInfo.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/ErrorHandling.h"
+using namespace llvm;
+
+DwarfPrinter::DwarfPrinter(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T,
+ const char *flavor)
+: O(OS), Asm(A), MAI(T), TD(Asm->TM.getTargetData()),
+ RI(Asm->TM.getRegisterInfo()), M(NULL), MF(NULL), MMI(NULL),
+ SubprogramCount(0), Flavor(flavor), SetCounter(1) {}
+
+void DwarfPrinter::PrintRelDirective(bool Force32Bit, bool isInSection) const {
+ if (isInSection && MAI->getDwarfSectionOffsetDirective())
+ O << MAI->getDwarfSectionOffsetDirective();
+ else if (Force32Bit || TD->getPointerSize() == sizeof(int32_t))
+ O << MAI->getData32bitsDirective();
+ else
+ O << MAI->getData64bitsDirective();
+}
+
+/// EOL - Print a newline character to asm stream. If a comment is present
+/// then it will be printed first. Comments should not contain '\n'.
+void DwarfPrinter::EOL(const Twine &Comment) const {
+ if (Asm->VerboseAsm && !Comment.isTriviallyEmpty()) {
+ Asm->O.PadToColumn(MAI->getCommentColumn());
+ Asm->O << Asm->MAI->getCommentString() << ' ' << Comment;
+ }
+ Asm->O << '\n';
+}
+
+static const char *DecodeDWARFEncoding(unsigned Encoding) {
+ switch (Encoding) {
+ case dwarf::DW_EH_PE_absptr: return "absptr";
+ case dwarf::DW_EH_PE_omit: return "omit";
+ case dwarf::DW_EH_PE_pcrel: return "pcrel";
+ case dwarf::DW_EH_PE_udata4: return "udata4";
+ case dwarf::DW_EH_PE_udata8: return "udata8";
+ case dwarf::DW_EH_PE_sdata4: return "sdata4";
+ case dwarf::DW_EH_PE_sdata8: return "sdata8";
+ case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4: return "pcrel udata4";
+ case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4: return "pcrel sdata4";
+ case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8: return "pcrel udata8";
+ case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8: return "pcrel sdata8";
+ case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
+ return "indirect pcrel udata4";
+ case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
+ return "indirect pcrel sdata4";
+ case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
+ return "indirect pcrel udata8";
+ case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
+ return "indirect pcrel sdata8";
+ }
+
+ return "<unknown encoding>";
+}
+
+/// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
+/// encoding. If verbose assembly output is enabled, we output comments
+/// describing the encoding. Desc is an optional string saying what the
+/// encoding is specifying (e.g. "LSDA").
+void DwarfPrinter::EmitEncodingByte(unsigned Val, const char *Desc) {
+ if (Asm->VerboseAsm) {
+ if (Desc != 0)
+ Asm->OutStreamer.AddComment(Twine(Desc)+" Encoding = " +
+ Twine(DecodeDWARFEncoding(Val)));
+ else
+ Asm->OutStreamer.AddComment(Twine("Encoding = ") +
+ DecodeDWARFEncoding(Val));
+ }
+
+ Asm->OutStreamer.EmitIntValue(Val, 1, 0/*addrspace*/);
+}
+
+/// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
+void DwarfPrinter::EmitCFAByte(unsigned Val) {
+ if (Asm->VerboseAsm) {
+ if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset+64)
+ Asm->OutStreamer.AddComment("DW_CFA_offset + Reg (" +
+ Twine(Val-dwarf::DW_CFA_offset) + ")");
+ else
+ Asm->OutStreamer.AddComment(dwarf::CallFrameString(Val));
+ }
+ Asm->OutStreamer.EmitIntValue(Val, 1, 0/*addrspace*/);
+}
+
+/// EmitSLEB128 - emit the specified signed leb128 value.
+void DwarfPrinter::EmitSLEB128(int Value, const char *Desc) const {
+ if (Asm->VerboseAsm && Desc)
+ Asm->OutStreamer.AddComment(Desc);
+
+ if (MAI->hasLEB128()) {
+ O << "\t.sleb128\t" << Value;
+ Asm->OutStreamer.AddBlankLine();
+ return;
+ }
+
+ // If we don't have .sleb128, emit as .bytes.
+ int Sign = Value >> (8 * sizeof(Value) - 1);
+ bool IsMore;
+
+ do {
+ unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
+ Value >>= 7;
+ IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
+ if (IsMore) Byte |= 0x80;
+
+ Asm->OutStreamer.EmitIntValue(Byte, 1, /*addrspace*/0);
+ } while (IsMore);
+}
+
+/// EmitULEB128 - emit the specified signed leb128 value.
+void DwarfPrinter::EmitULEB128(unsigned Value, const char *Desc) const {
+ if (Asm->VerboseAsm && Desc)
+ Asm->OutStreamer.AddComment(Desc);
+
+ if (MAI->hasLEB128()) {
+ O << "\t.uleb128\t" << Value;
+ Asm->OutStreamer.AddBlankLine();
+ return;
+ }
+
+ // If we don't have .uleb128, emit as .bytes.
+ do {
+ unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
+ Value >>= 7;
+ if (Value) Byte |= 0x80;
+ Asm->OutStreamer.EmitIntValue(Byte, 1, /*addrspace*/0);
+ } while (Value);
+}
+
+
+/// PrintLabelName - Print label name in form used by Dwarf writer.
+///
+void DwarfPrinter::PrintLabelName(const char *Tag, unsigned Number) const {
+ O << MAI->getPrivateGlobalPrefix() << Tag;
+ if (Number) O << Number;
+}
+void DwarfPrinter::PrintLabelName(const char *Tag, unsigned Number,
+ const char *Suffix) const {
+ O << MAI->getPrivateGlobalPrefix() << Tag;
+ if (Number) O << Number;
+ O << Suffix;
+}
+
+/// EmitLabel - Emit location label for internal use by Dwarf.
+///
+void DwarfPrinter::EmitLabel(const char *Tag, unsigned Number) const {
+ PrintLabelName(Tag, Number);
+ O << ":\n";
+}
+
+/// EmitReference - Emit a reference to a label.
+///
+void DwarfPrinter::EmitReference(const char *Tag, unsigned Number,
+ bool IsPCRelative, bool Force32Bit) const {
+ PrintRelDirective(Force32Bit);
+ PrintLabelName(Tag, Number);
+ if (IsPCRelative) O << "-" << MAI->getPCSymbol();
+}
+void DwarfPrinter::EmitReference(const std::string &Name, bool IsPCRelative,
+ bool Force32Bit) const {
+ PrintRelDirective(Force32Bit);
+ O << Name;
+ if (IsPCRelative) O << "-" << MAI->getPCSymbol();
+}
+
+void DwarfPrinter::EmitReference(const MCSymbol *Sym, bool IsPCRelative,
+ bool Force32Bit) const {
+ PrintRelDirective(Force32Bit);
+ O << *Sym;
+ if (IsPCRelative) O << "-" << MAI->getPCSymbol();
+}
+
+/// EmitDifference - Emit the difference between two labels. If this assembler
+/// supports .set, we emit a .set of a temporary and then use it in the .word.
+void DwarfPrinter::EmitDifference(const char *TagHi, unsigned NumberHi,
+ const char *TagLo, unsigned NumberLo,
+ bool IsSmall) {
+ if (MAI->hasSetDirective()) {
+ // FIXME: switch to OutStreamer.EmitAssignment.
+ O << "\t.set\t";
+ PrintLabelName("set", SetCounter, Flavor);
+ O << ",";
+ PrintLabelName(TagHi, NumberHi);
+ O << "-";
+ PrintLabelName(TagLo, NumberLo);
+ O << "\n";
+
+ PrintRelDirective(IsSmall);
+ PrintLabelName("set", SetCounter, Flavor);
+ ++SetCounter;
+ } else {
+ PrintRelDirective(IsSmall);
+ PrintLabelName(TagHi, NumberHi);
+ O << "-";
+ PrintLabelName(TagLo, NumberLo);
+ }
+}
+
+void DwarfPrinter::EmitSectionOffset(const char* Label, const char* Section,
+ unsigned LabelNumber,
+ unsigned SectionNumber,
+ bool IsSmall, bool isEH,
+ bool useSet) {
+ bool printAbsolute = false;
+ if (isEH)
+ printAbsolute = MAI->isAbsoluteEHSectionOffsets();
+ else
+ printAbsolute = MAI->isAbsoluteDebugSectionOffsets();
+
+ if (MAI->hasSetDirective() && useSet) {
+ // FIXME: switch to OutStreamer.EmitAssignment.
+ O << "\t.set\t";
+ PrintLabelName("set", SetCounter, Flavor);
+ O << ",";
+ PrintLabelName(Label, LabelNumber);
+
+ if (!printAbsolute) {
+ O << "-";
+ PrintLabelName(Section, SectionNumber);
+ }
+
+ O << "\n";
+ PrintRelDirective(IsSmall);
+ PrintLabelName("set", SetCounter, Flavor);
+ ++SetCounter;
+ O << "\n";
+ } else {
+ PrintRelDirective(IsSmall, true);
+ PrintLabelName(Label, LabelNumber);
+
+ if (!printAbsolute) {
+ O << "-";
+ PrintLabelName(Section, SectionNumber);
+ }
+ O << "\n";
+ }
+}
+
+/// EmitFrameMoves - Emit frame instructions to describe the layout of the
+/// frame.
+void DwarfPrinter::EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
+ const std::vector<MachineMove> &Moves,
+ bool isEH) {
+ int stackGrowth =
+ Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
+ TargetFrameInfo::StackGrowsUp ?
+ TD->getPointerSize() : -TD->getPointerSize();
+ bool IsLocal = BaseLabel && strcmp(BaseLabel, "label") == 0;
+
+ for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
+ const MachineMove &Move = Moves[i];
+ unsigned LabelID = Move.getLabelID();
+
+ if (LabelID) {
+ LabelID = MMI->MappedLabel(LabelID);
+
+ // Throw out move if the label is invalid.
+ if (!LabelID) continue;
+ }
+
+ const MachineLocation &Dst = Move.getDestination();
+ const MachineLocation &Src = Move.getSource();
+
+ // Advance row if new location.
+ if (BaseLabel && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
+ EmitCFAByte(dwarf::DW_CFA_advance_loc4);
+ EmitDifference("label", LabelID, BaseLabel, BaseLabelID, true);
+ Asm->O << '\n';
+
+ BaseLabelID = LabelID;
+ BaseLabel = "label";
+ IsLocal = true;
+ }
+
+ // If advancing cfa.
+ if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
+ if (!Src.isReg()) {
+ if (Src.getReg() == MachineLocation::VirtualFP) {
+ EmitCFAByte(dwarf::DW_CFA_def_cfa_offset);
+ } else {
+ EmitCFAByte(dwarf::DW_CFA_def_cfa);
+ EmitULEB128(RI->getDwarfRegNum(Src.getReg(), isEH), "Register");
+ }
+
+ int Offset = -Src.getOffset();
+ EmitULEB128(Offset, "Offset");
+ } else {
+ llvm_unreachable("Machine move not supported yet.");
+ }
+ } else if (Src.isReg() &&
+ Src.getReg() == MachineLocation::VirtualFP) {
+ if (Dst.isReg()) {
+ EmitCFAByte(dwarf::DW_CFA_def_cfa_register);
+ EmitULEB128(RI->getDwarfRegNum(Dst.getReg(), isEH), "Register");
+ } else {
+ llvm_unreachable("Machine move not supported yet.");
+ }
+ } else {
+ unsigned Reg = RI->getDwarfRegNum(Src.getReg(), isEH);
+ int Offset = Dst.getOffset() / stackGrowth;
+
+ if (Offset < 0) {
+ EmitCFAByte(dwarf::DW_CFA_offset_extended_sf);
+ EmitULEB128(Reg, "Reg");
+ EmitSLEB128(Offset, "Offset");
+ } else if (Reg < 64) {
+ EmitCFAByte(dwarf::DW_CFA_offset + Reg);
+ EmitULEB128(Offset, "Offset");
+ } else {
+ EmitCFAByte(dwarf::DW_CFA_offset_extended);
+ EmitULEB128(Reg, "Reg");
+ EmitULEB128(Offset, "Offset");
+ }
+ }
+ }
+}
diff --git a/lib/CodeGen/AsmPrinter/DwarfPrinter.h b/lib/CodeGen/AsmPrinter/DwarfPrinter.h
new file mode 100644
index 0000000..69d9c27
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfPrinter.h
@@ -0,0 +1,167 @@
+//===--- lib/CodeGen/DwarfPrinter.h - Dwarf Printer -------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Emit general DWARF directives.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CODEGEN_ASMPRINTER_DWARFPRINTER_H__
+#define CODEGEN_ASMPRINTER_DWARFPRINTER_H__
+
+#include "DwarfLabel.h"
+#include "llvm/CodeGen/MachineLocation.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/FormattedStream.h"
+#include <vector>
+
+namespace llvm {
+class AsmPrinter;
+class MachineFunction;
+class MachineModuleInfo;
+class Module;
+class MCAsmInfo;
+class TargetData;
+class TargetRegisterInfo;
+class MCSymbol;
+class Twine;
+
+class DwarfPrinter {
+protected:
+ ~DwarfPrinter() {}
+
+ //===-------------------------------------------------------------==---===//
+ // Core attributes used by the DWARF printer.
+ //
+
+ /// O - Stream to .s file.
+ raw_ostream &O;
+
+ /// Asm - Target of Dwarf emission.
+ AsmPrinter *Asm;
+
+ /// MAI - Target asm information.
+ const MCAsmInfo *MAI;
+
+ /// TD - Target data.
+ const TargetData *TD;
+
+ /// RI - Register Information.
+ const TargetRegisterInfo *RI;
+
+ /// M - Current module.
+ Module *M;
+
+ /// MF - Current machine function.
+ const MachineFunction *MF;
+
+ /// MMI - Collected machine module information.
+ MachineModuleInfo *MMI;
+
+ /// SubprogramCount - The running count of functions being compiled.
+ unsigned SubprogramCount;
+
+ /// Flavor - A unique string indicating what dwarf producer this is, used to
+ /// unique labels.
+ const char * const Flavor;
+
+ /// SetCounter - A unique number for each '.set' directive.
+ unsigned SetCounter;
+
+ DwarfPrinter(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T,
+ const char *flavor);
+public:
+
+ //===------------------------------------------------------------------===//
+ // Accessors.
+ //
+ const AsmPrinter *getAsm() const { return Asm; }
+ MachineModuleInfo *getMMI() const { return MMI; }
+ const MCAsmInfo *getMCAsmInfo() const { return MAI; }
+ const TargetData *getTargetData() const { return TD; }
+
+ void PrintRelDirective(bool Force32Bit = false,
+ bool isInSection = false) const;
+
+ /// EOL - Print a newline character to asm stream. If a comment is present
+ /// then it will be printed first. Comments should not contain '\n'.
+ void EOL(const Twine &Comment) const;
+
+ /// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
+ /// encoding. If verbose assembly output is enabled, we output comments
+ /// describing the encoding. Desc is a string saying what the encoding is
+ /// specifying (e.g. "LSDA").
+ void EmitEncodingByte(unsigned Val, const char *Desc);
+
+ /// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
+ void EmitCFAByte(unsigned Val);
+
+
+ /// EmitSLEB128 - emit the specified signed leb128 value.
+ void EmitSLEB128(int Value, const char *Desc) const;
+
+ /// EmitULEB128 - emit the specified unsigned leb128 value.
+ void EmitULEB128(unsigned Value, const char *Desc = 0) const;
+
+
+ /// PrintLabelName - Print label name in form used by Dwarf writer.
+ ///
+ void PrintLabelName(const DWLabel &Label) const {
+ PrintLabelName(Label.getTag(), Label.getNumber());
+ }
+ void PrintLabelName(const char *Tag, unsigned Number) const;
+ void PrintLabelName(const char *Tag, unsigned Number,
+ const char *Suffix) const;
+
+ /// EmitLabel - Emit location label for internal use by Dwarf.
+ ///
+ void EmitLabel(const DWLabel &Label) const {
+ EmitLabel(Label.getTag(), Label.getNumber());
+ }
+ void EmitLabel(const char *Tag, unsigned Number) const;
+
+ /// EmitReference - Emit a reference to a label.
+ ///
+ void EmitReference(const DWLabel &Label, bool IsPCRelative = false,
+ bool Force32Bit = false) const {
+ EmitReference(Label.getTag(), Label.getNumber(),
+ IsPCRelative, Force32Bit);
+ }
+ void EmitReference(const char *Tag, unsigned Number,
+ bool IsPCRelative = false,
+ bool Force32Bit = false) const;
+ void EmitReference(const std::string &Name, bool IsPCRelative = false,
+ bool Force32Bit = false) const;
+ void EmitReference(const MCSymbol *Sym, bool IsPCRelative = false,
+ bool Force32Bit = false) const;
+
+ /// EmitDifference - Emit the difference between two labels.
+ void EmitDifference(const DWLabel &LabelHi, const DWLabel &LabelLo,
+ bool IsSmall = false) {
+ EmitDifference(LabelHi.getTag(), LabelHi.getNumber(),
+ LabelLo.getTag(), LabelLo.getNumber(),
+ IsSmall);
+ }
+ void EmitDifference(const char *TagHi, unsigned NumberHi,
+ const char *TagLo, unsigned NumberLo,
+ bool IsSmall = false);
+
+ void EmitSectionOffset(const char* Label, const char* Section,
+ unsigned LabelNumber, unsigned SectionNumber,
+ bool IsSmall = false, bool isEH = false,
+ bool useSet = true);
+
+ /// EmitFrameMoves - Emit frame instructions to describe the layout of the
+ /// frame.
+ void EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
+ const std::vector<MachineMove> &Moves, bool isEH);
+};
+
+} // end llvm namespace
+
+#endif
diff --git a/lib/CodeGen/AsmPrinter/DwarfWriter.cpp b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
new file mode 100644
index 0000000..08e1bbc
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
@@ -0,0 +1,100 @@
+//===-- llvm/CodeGen/DwarfWriter.cpp - Dwarf Framework --------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing dwarf info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/DwarfWriter.h"
+#include "DwarfDebug.h"
+#include "DwarfException.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+
+using namespace llvm;
+
+static RegisterPass<DwarfWriter>
+X("dwarfwriter", "DWARF Information Writer");
+char DwarfWriter::ID = 0;
+
+//===----------------------------------------------------------------------===//
+/// DwarfWriter Implementation
+///
+
+DwarfWriter::DwarfWriter()
+ : ImmutablePass(&ID), DD(0), DE(0) {}
+
+DwarfWriter::~DwarfWriter() {
+ delete DE;
+ delete DD;
+}
+
+/// BeginModule - Emit all Dwarf sections that should come prior to the
+/// content.
+void DwarfWriter::BeginModule(Module *M,
+ MachineModuleInfo *MMI,
+ raw_ostream &OS, AsmPrinter *A,
+ const MCAsmInfo *T) {
+ DE = new DwarfException(OS, A, T);
+ DD = new DwarfDebug(OS, A, T);
+ DE->BeginModule(M, MMI);
+ DD->beginModule(M, MMI);
+}
+
+/// EndModule - Emit all Dwarf sections that should come after the content.
+///
+void DwarfWriter::EndModule() {
+ DE->EndModule();
+ DD->endModule();
+ delete DD; DD = 0;
+ delete DE; DE = 0;
+}
+
+/// BeginFunction - Gather pre-function debug information. Assumes being
+/// emitted immediately after the function entry point.
+void DwarfWriter::BeginFunction(const MachineFunction *MF) {
+ DE->BeginFunction(MF);
+ DD->beginFunction(MF);
+}
+
+/// EndFunction - Gather and emit post-function debug information.
+///
+void DwarfWriter::EndFunction(const MachineFunction *MF) {
+ DD->endFunction(MF);
+ DE->EndFunction();
+
+ if (MachineModuleInfo *MMI = DD->getMMI() ? DD->getMMI() : DE->getMMI())
+ // Clear function debug information.
+ MMI->EndFunction();
+}
+
+/// RecordSourceLine - Records location information and associates it with a
+/// label. Returns a unique label ID used to generate a label and provide
+/// correspondence to the source line list.
+unsigned DwarfWriter::RecordSourceLine(unsigned Line, unsigned Col,
+ MDNode *Scope) {
+ return DD->recordSourceLine(Line, Col, Scope);
+}
+
+/// getRecordSourceLineCount - Count source lines.
+unsigned DwarfWriter::getRecordSourceLineCount() {
+ return DD->getSourceLineCount();
+}
+
+/// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
+/// be emitted.
+bool DwarfWriter::ShouldEmitDwarfDebug() const {
+ return DD && DD->ShouldEmitDwarfDebug();
+}
+
+void DwarfWriter::BeginScope(const MachineInstr *MI, unsigned L) {
+ DD->beginScope(MI, L);
+}
+void DwarfWriter::EndScope(const MachineInstr *MI) {
+ DD->endScope(MI);
+}
diff --git a/lib/CodeGen/AsmPrinter/Makefile b/lib/CodeGen/AsmPrinter/Makefile
new file mode 100644
index 0000000..60aa6cb
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/Makefile
@@ -0,0 +1,13 @@
+##===- lib/CodeGen/AsmPrinter/Makefile ---------------------*- Makefile -*-===##
+#
+# The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../../..
+LIBRARYNAME = LLVMAsmPrinter
+
+include $(LEVEL)/Makefile.common
diff --git a/lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp b/lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp
new file mode 100644
index 0000000..3531ed6
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp
@@ -0,0 +1,160 @@
+//===-- OcamlGCPrinter.cpp - Ocaml frametable emitter ---------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements printing the assembly code for an Ocaml frametable.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/GCs.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/GCMetadataPrinter.h"
+#include "llvm/Module.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+using namespace llvm;
+
+namespace {
+
+ class OcamlGCMetadataPrinter : public GCMetadataPrinter {
+ public:
+ void beginAssembly(raw_ostream &OS, AsmPrinter &AP,
+ const MCAsmInfo &MAI);
+
+ void finishAssembly(raw_ostream &OS, AsmPrinter &AP,
+ const MCAsmInfo &MAI);
+ };
+
+}
+
+static GCMetadataPrinterRegistry::Add<OcamlGCMetadataPrinter>
+Y("ocaml", "ocaml 3.10-compatible collector");
+
+void llvm::linkOcamlGCPrinter() { }
+
+static void EmitCamlGlobal(const Module &M, raw_ostream &OS, AsmPrinter &AP,
+ const MCAsmInfo &MAI, const char *Id) {
+ const std::string &MId = M.getModuleIdentifier();
+
+ std::string Mangled;
+ Mangled += MAI.getGlobalPrefix();
+ Mangled += "caml";
+ size_t Letter = Mangled.size();
+ Mangled.append(MId.begin(), std::find(MId.begin(), MId.end(), '.'));
+ Mangled += "__";
+ Mangled += Id;
+
+ // Capitalize the first letter of the module name.
+ Mangled[Letter] = toupper(Mangled[Letter]);
+
+ if (const char *GlobalDirective = MAI.getGlobalDirective())
+ OS << GlobalDirective << Mangled << "\n";
+ OS << Mangled << ":\n";
+}
+
+void OcamlGCMetadataPrinter::beginAssembly(raw_ostream &OS, AsmPrinter &AP,
+ const MCAsmInfo &MAI) {
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getTextSection());
+ EmitCamlGlobal(getModule(), OS, AP, MAI, "code_begin");
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
+ EmitCamlGlobal(getModule(), OS, AP, MAI, "data_begin");
+}
+
+/// emitAssembly - Print the frametable. The ocaml frametable format is thus:
+///
+/// extern "C" struct align(sizeof(intptr_t)) {
+/// uint16_t NumDescriptors;
+/// struct align(sizeof(intptr_t)) {
+/// void *ReturnAddress;
+/// uint16_t FrameSize;
+/// uint16_t NumLiveOffsets;
+/// uint16_t LiveOffsets[NumLiveOffsets];
+/// } Descriptors[NumDescriptors];
+/// } caml${module}__frametable;
+///
+/// Note that this precludes programs from stack frames larger than 64K
+/// (FrameSize and LiveOffsets would overflow). FrameTablePrinter will abort if
+/// either condition is detected in a function which uses the GC.
+///
+void OcamlGCMetadataPrinter::finishAssembly(raw_ostream &OS, AsmPrinter &AP,
+ const MCAsmInfo &MAI) {
+ const char *AddressDirective;
+ int AddressAlignLog;
+ if (AP.TM.getTargetData()->getPointerSize() == sizeof(int32_t)) {
+ AddressDirective = MAI.getData32bitsDirective();
+ AddressAlignLog = 2;
+ } else {
+ AddressDirective = MAI.getData64bitsDirective();
+ AddressAlignLog = 3;
+ }
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getTextSection());
+ EmitCamlGlobal(getModule(), OS, AP, MAI, "code_end");
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
+ EmitCamlGlobal(getModule(), OS, AP, MAI, "data_end");
+
+ OS << AddressDirective << 0 << '\n'; // FIXME: Why does ocaml emit this??
+
+ AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
+ EmitCamlGlobal(getModule(), OS, AP, MAI, "frametable");
+
+ for (iterator I = begin(), IE = end(); I != IE; ++I) {
+ GCFunctionInfo &FI = **I;
+
+ uint64_t FrameSize = FI.getFrameSize();
+ if (FrameSize >= 1<<16) {
+ std::string msg;
+ raw_string_ostream Msg(msg);
+ Msg << "Function '" << FI.getFunction().getName()
+ << "' is too large for the ocaml GC! "
+ << "Frame size " << FrameSize << " >= 65536.\n";
+ Msg << "(" << uintptr_t(&FI) << ")";
+ llvm_report_error(Msg.str()); // Very rude!
+ }
+
+ OS << "\t" << MAI.getCommentString() << " live roots for "
+ << FI.getFunction().getName() << "\n";
+
+ for (GCFunctionInfo::iterator J = FI.begin(), JE = FI.end(); J != JE; ++J) {
+ size_t LiveCount = FI.live_size(J);
+ if (LiveCount >= 1<<16) {
+ std::string msg;
+ raw_string_ostream Msg(msg);
+ Msg << "Function '" << FI.getFunction().getName()
+ << "' is too large for the ocaml GC! "
+ << "Live root count " << LiveCount << " >= 65536.";
+ llvm_report_error(Msg.str()); // Very rude!
+ }
+
+ OS << AddressDirective
+ << MAI.getPrivateGlobalPrefix() << "label" << J->Num << '\n';
+
+ AP.EmitInt16(FrameSize);
+
+ AP.EmitInt16(LiveCount);
+
+ for (GCFunctionInfo::live_iterator K = FI.live_begin(J),
+ KE = FI.live_end(J); K != KE; ++K) {
+ assert(K->StackOffset < 1<<16 &&
+ "GC root stack offset is outside of fixed stack frame and out "
+ "of range for ocaml GC!");
+
+ AP.EmitInt32(K->StackOffset);
+ }
+
+ AP.EmitAlignment(AddressAlignLog);
+ }
+ }
+}