It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter.cpp
new file mode 100644
index 0000000..586472c
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter.cpp
@@ -0,0 +1,1210 @@
+//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the AsmPrinter class.
+//
+//===----------------------------------------------------------------------===//
+
+#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/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineJumpTableInfo.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetMachine.h"
+#include <cerrno>
+using namespace llvm;
+
+static cl::opt<bool>
+AsmVerbose("asm-verbose", cl::Hidden, cl::desc("Add comments to directives."));
+
+char AsmPrinter::ID = 0;
+AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm,
+ const TargetAsmInfo *T)
+ : MachineFunctionPass((intptr_t)&ID), FunctionNumber(0), O(o), TM(tm), TAI(T)
+{}
+
+std::string AsmPrinter::getSectionForFunction(const Function &F) const {
+ return TAI->getTextSection();
+}
+
+
+/// SwitchToTextSection - Switch to the specified text section of the executable
+/// if we are not already in it!
+///
+void AsmPrinter::SwitchToTextSection(const char *NewSection,
+ const GlobalValue *GV) {
+ std::string NS;
+ if (GV && GV->hasSection())
+ NS = TAI->getSwitchToSectionDirective() + GV->getSection();
+ else
+ NS = NewSection;
+
+ // If we're already in this section, we're done.
+ if (CurrentSection == NS) return;
+
+ // Close the current section, if applicable.
+ if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
+ O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
+
+ CurrentSection = NS;
+
+ if (!CurrentSection.empty())
+ O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
+}
+
+/// SwitchToDataSection - Switch to the specified data section of the executable
+/// if we are not already in it!
+///
+void AsmPrinter::SwitchToDataSection(const char *NewSection,
+ const GlobalValue *GV) {
+ std::string NS;
+ if (GV && GV->hasSection())
+ NS = TAI->getSwitchToSectionDirective() + GV->getSection();
+ else
+ NS = NewSection;
+
+ // If we're already in this section, we're done.
+ if (CurrentSection == NS) return;
+
+ // Close the current section, if applicable.
+ if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
+ O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
+
+ CurrentSection = NS;
+
+ if (!CurrentSection.empty())
+ O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
+}
+
+
+bool AsmPrinter::doInitialization(Module &M) {
+ Mang = new Mangler(M, TAI->getGlobalPrefix());
+
+ if (!M.getModuleInlineAsm().empty())
+ O << TAI->getCommentString() << " Start of file scope inline assembly\n"
+ << M.getModuleInlineAsm()
+ << "\n" << TAI->getCommentString()
+ << " End of file scope inline assembly\n";
+
+ SwitchToDataSection(""); // Reset back to no section.
+
+ if (MachineModuleInfo *MMI = getAnalysisToUpdate<MachineModuleInfo>()) {
+ MMI->AnalyzeModule(M);
+ }
+
+ return false;
+}
+
+bool AsmPrinter::doFinalization(Module &M) {
+ if (TAI->getWeakRefDirective()) {
+ if (!ExtWeakSymbols.empty())
+ SwitchToDataSection("");
+
+ for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(),
+ e = ExtWeakSymbols.end(); i != e; ++i) {
+ const GlobalValue *GV = *i;
+ std::string Name = Mang->getValueName(GV);
+ O << TAI->getWeakRefDirective() << Name << "\n";
+ }
+ }
+
+ if (TAI->getSetDirective()) {
+ if (!M.alias_empty())
+ SwitchToTextSection(TAI->getTextSection());
+
+ O << "\n";
+ for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
+ I!=E; ++I) {
+ std::string Name = Mang->getValueName(I);
+ std::string Target;
+
+ if (const GlobalValue *GV = I->getAliasedGlobal())
+ Target = Mang->getValueName(GV);
+ else
+ assert(0 && "Unsupported aliasee");
+
+ if (I->hasExternalLinkage())
+ O << "\t.globl\t" << Name << "\n";
+ else if (I->hasWeakLinkage())
+ O << TAI->getWeakRefDirective() << Name << "\n";
+ else if (!I->hasInternalLinkage())
+ assert(0 && "Invalid alias linkage");
+
+ O << TAI->getSetDirective() << Name << ", " << Target << "\n";
+ }
+ }
+
+ delete Mang; Mang = 0;
+ return false;
+}
+
+void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
+ // What's my mangled name?
+ CurrentFnName = Mang->getValueName(MF.getFunction());
+ IncrementFunctionNumber();
+}
+
+/// 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(MachineConstantPool *MCP) {
+ const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
+ if (CP.empty()) return;
+
+ // Some targets require 4-, 8-, and 16- byte constant literals to be placed
+ // in special sections.
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
+ for (unsigned i = 0, e = CP.size(); i != e; ++i) {
+ MachineConstantPoolEntry CPE = CP[i];
+ const Type *Ty = CPE.getType();
+ if (TAI->getFourByteConstantSection() &&
+ TM.getTargetData()->getTypeSize(Ty) == 4)
+ FourByteCPs.push_back(std::make_pair(CPE, i));
+ else if (TAI->getEightByteConstantSection() &&
+ TM.getTargetData()->getTypeSize(Ty) == 8)
+ EightByteCPs.push_back(std::make_pair(CPE, i));
+ else if (TAI->getSixteenByteConstantSection() &&
+ TM.getTargetData()->getTypeSize(Ty) == 16)
+ SixteenByteCPs.push_back(std::make_pair(CPE, i));
+ else
+ OtherCPs.push_back(std::make_pair(CPE, i));
+ }
+
+ unsigned Alignment = MCP->getConstantPoolAlignment();
+ EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
+ EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
+ EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
+ SixteenByteCPs);
+ EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
+}
+
+void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
+ std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
+ if (CP.empty()) return;
+
+ SwitchToDataSection(Section);
+ EmitAlignment(Alignment);
+ for (unsigned i = 0, e = CP.size(); i != e; ++i) {
+ O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
+ << CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << " ";
+ WriteTypeSymbolic(O, CP[i].first.getType(), 0) << '\n';
+ if (CP[i].first.isMachineConstantPoolEntry())
+ EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
+ else
+ EmitGlobalConstant(CP[i].first.Val.ConstVal);
+ if (i != e-1) {
+ const Type *Ty = CP[i].first.getType();
+ unsigned EntSize =
+ TM.getTargetData()->getTypeSize(Ty);
+ unsigned ValEnd = CP[i].first.getOffset() + EntSize;
+ // Emit inter-object padding for alignment.
+ EmitZeros(CP[i+1].first.getOffset()-ValEnd);
+ }
+ }
+}
+
+/// EmitJumpTableInfo - Print assembly representations of the jump tables used
+/// by the current function to the current output stream.
+///
+void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
+ MachineFunction &MF) {
+ const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
+ if (JT.empty()) return;
+ bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
+
+ // Use JumpTableDirective otherwise honor the entry size from the jump table
+ // info.
+ const char *JTEntryDirective = TAI->getJumpTableDirective();
+ bool HadJTEntryDirective = JTEntryDirective != NULL;
+ if (!HadJTEntryDirective) {
+ JTEntryDirective = MJTI->getEntrySize() == 4 ?
+ TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
+ }
+
+ // Pick the directive to use to print the jump table entries, and switch to
+ // the appropriate section.
+ TargetLowering *LoweringInfo = TM.getTargetLowering();
+
+ const char* JumpTableDataSection = TAI->getJumpTableDataSection();
+ if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
+ !JumpTableDataSection) {
+ // 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.
+ // We should also do if the section name is NULL.
+ const Function *F = MF.getFunction();
+ SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
+ } else {
+ SwitchToDataSection(JumpTableDataSection);
+ }
+
+ EmitAlignment(Log2_32(MJTI->getAlignment()));
+
+ for (unsigned i = 0, e = JT.size(); i != e; ++i) {
+ const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
+
+ // If this jump table was deleted, ignore it.
+ if (JTBBs.empty()) continue;
+
+ // For PIC codegen, if possible we want to use the SetDirective to reduce
+ // the number of relocations the assembler will generate for the jump table.
+ // Set directives are all printed before the jump table itself.
+ std::set<MachineBasicBlock*> EmittedSets;
+ if (TAI->getSetDirective() && IsPic)
+ for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
+ if (EmittedSets.insert(JTBBs[ii]).second)
+ printSetLabel(i, JTBBs[ii]);
+
+ // 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 (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
+ O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
+
+ O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
+ << '_' << i << ":\n";
+
+ for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
+ O << JTEntryDirective << ' ';
+ // 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 we're emitting non-PIC code, then emit the entries as direct
+ // references to the target basic blocks.
+ if (!EmittedSets.empty()) {
+ O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
+ << '_' << i << "_set_" << JTBBs[ii]->getNumber();
+ } else if (IsPic) {
+ printBasicBlockLabel(JTBBs[ii], false, false);
+ // If the arch uses custom Jump Table directives, don't calc relative to
+ // JT
+ if (!HadJTEntryDirective)
+ O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
+ << getFunctionNumber() << '_' << i;
+ } else {
+ printBasicBlockLabel(JTBBs[ii], false, false);
+ }
+ O << '\n';
+ }
+ }
+}
+
+/// 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) {
+ // Ignore debug and non-emitted data.
+ if (GV->getSection() == "llvm.metadata") return true;
+
+ if (!GV->hasAppendingLinkage()) return false;
+
+ assert(GV->hasInitializer() && "Not a special LLVM global!");
+
+ if (GV->getName() == "llvm.used") {
+ if (TAI->getUsedDirective() != 0) // No need to emit this at all.
+ EmitLLVMUsedList(GV->getInitializer());
+ return true;
+ }
+
+ const TargetData *TD = TM.getTargetData();
+ unsigned Align = Log2_32(TD->getPointerPrefAlignment());
+ if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
+ SwitchToDataSection(TAI->getStaticCtorsSection());
+ EmitAlignment(Align, 0);
+ EmitXXStructorList(GV->getInitializer());
+ return true;
+ }
+
+ if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
+ SwitchToDataSection(TAI->getStaticDtorsSection());
+ EmitAlignment(Align, 0);
+ EmitXXStructorList(GV->getInitializer());
+ return true;
+ }
+
+ return false;
+}
+
+/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
+/// global in the specified llvm.used list as being used with this directive.
+void AsmPrinter::EmitLLVMUsedList(Constant *List) {
+ const char *Directive = TAI->getUsedDirective();
+
+ // Should be an array of 'sbyte*'.
+ ConstantArray *InitList = dyn_cast<ConstantArray>(List);
+ if (InitList == 0) return;
+
+ for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
+ O << Directive;
+ EmitConstantValueOnly(InitList->getOperand(i));
+ O << "\n";
+ }
+}
+
+/// 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));
+ }
+}
+
+/// getGlobalLinkName - Returns the asm/link name of of the specified
+/// global variable. Should be overridden by each target asm printer to
+/// generate the appropriate value.
+const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
+ std::string LinkName;
+
+ if (isa<Function>(GV)) {
+ LinkName += TAI->getFunctionAddrPrefix();
+ LinkName += Mang->getValueName(GV);
+ LinkName += TAI->getFunctionAddrSuffix();
+ } else {
+ LinkName += TAI->getGlobalVarAddrPrefix();
+ LinkName += Mang->getValueName(GV);
+ LinkName += TAI->getGlobalVarAddrSuffix();
+ }
+
+ return LinkName;
+}
+
+/// EmitExternalGlobal - Emit the external reference to a global variable.
+/// Should be overridden if an indirect reference should be used.
+void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
+ O << getGlobalLinkName(GV);
+}
+
+
+
+//===----------------------------------------------------------------------===//
+/// LEB 128 number encoding.
+
+/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
+/// representing an unsigned leb128 value.
+void AsmPrinter::PrintULEB128(unsigned Value) const {
+ do {
+ unsigned Byte = Value & 0x7f;
+ Value >>= 7;
+ if (Value) Byte |= 0x80;
+ O << "0x" << std::hex << Byte << std::dec;
+ if (Value) O << ", ";
+ } while (Value);
+}
+
+/// SizeULEB128 - Compute the number of bytes required for an unsigned leb128
+/// value.
+unsigned AsmPrinter::SizeULEB128(unsigned Value) {
+ unsigned Size = 0;
+ do {
+ Value >>= 7;
+ Size += sizeof(int8_t);
+ } while (Value);
+ return Size;
+}
+
+/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
+/// representing a signed leb128 value.
+void AsmPrinter::PrintSLEB128(int Value) const {
+ int Sign = Value >> (8 * sizeof(Value) - 1);
+ bool IsMore;
+
+ do {
+ unsigned Byte = Value & 0x7f;
+ Value >>= 7;
+ IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
+ if (IsMore) Byte |= 0x80;
+ O << "0x" << std::hex << Byte << std::dec;
+ if (IsMore) O << ", ";
+ } while (IsMore);
+}
+
+/// SizeSLEB128 - Compute the number of bytes required for a signed leb128
+/// value.
+unsigned AsmPrinter::SizeSLEB128(int Value) {
+ unsigned Size = 0;
+ int Sign = Value >> (8 * sizeof(Value) - 1);
+ bool IsMore;
+
+ do {
+ unsigned Byte = Value & 0x7f;
+ Value >>= 7;
+ IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
+ Size += sizeof(int8_t);
+ } while (IsMore);
+ return Size;
+}
+
+//===--------------------------------------------------------------------===//
+// Emission and print routines
+//
+
+/// PrintHex - Print a value as a hexidecimal value.
+///
+void AsmPrinter::PrintHex(int Value) const {
+ O << "0x" << std::hex << Value << std::dec;
+}
+
+/// 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 AsmPrinter::EOL() const {
+ O << "\n";
+}
+void AsmPrinter::EOL(const std::string &Comment) const {
+ if (AsmVerbose && !Comment.empty()) {
+ O << "\t"
+ << TAI->getCommentString()
+ << " "
+ << Comment;
+ }
+ O << "\n";
+}
+
+/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
+/// unsigned leb128 value.
+void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
+ if (TAI->hasLEB128()) {
+ O << "\t.uleb128\t"
+ << Value;
+ } else {
+ O << TAI->getData8bitsDirective();
+ PrintULEB128(Value);
+ }
+}
+
+/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
+/// signed leb128 value.
+void AsmPrinter::EmitSLEB128Bytes(int Value) const {
+ if (TAI->hasLEB128()) {
+ O << "\t.sleb128\t"
+ << Value;
+ } else {
+ O << TAI->getData8bitsDirective();
+ PrintSLEB128(Value);
+ }
+}
+
+/// EmitInt8 - Emit a byte directive and value.
+///
+void AsmPrinter::EmitInt8(int Value) const {
+ O << TAI->getData8bitsDirective();
+ PrintHex(Value & 0xFF);
+}
+
+/// EmitInt16 - Emit a short directive and value.
+///
+void AsmPrinter::EmitInt16(int Value) const {
+ O << TAI->getData16bitsDirective();
+ PrintHex(Value & 0xFFFF);
+}
+
+/// EmitInt32 - Emit a long directive and value.
+///
+void AsmPrinter::EmitInt32(int Value) const {
+ O << TAI->getData32bitsDirective();
+ PrintHex(Value);
+}
+
+/// EmitInt64 - Emit a long long directive and value.
+///
+void AsmPrinter::EmitInt64(uint64_t Value) const {
+ if (TAI->getData64bitsDirective()) {
+ O << TAI->getData64bitsDirective();
+ PrintHex(Value);
+ } else {
+ if (TM.getTargetData()->isBigEndian()) {
+ EmitInt32(unsigned(Value >> 32)); O << "\n";
+ EmitInt32(unsigned(Value));
+ } else {
+ EmitInt32(unsigned(Value)); O << "\n";
+ EmitInt32(unsigned(Value >> 32));
+ }
+ }
+}
+
+/// toOctal - Convert the low order bits of X into an octal digit.
+///
+static inline char toOctal(int X) {
+ return (X&7)+'0';
+}
+
+/// printStringChar - Print a char, escaped if necessary.
+///
+static void printStringChar(std::ostream &O, unsigned char C) {
+ if (C == '"') {
+ O << "\\\"";
+ } else if (C == '\\') {
+ O << "\\\\";
+ } else if (isprint(C)) {
+ O << C;
+ } else {
+ switch(C) {
+ case '\b': O << "\\b"; break;
+ case '\f': O << "\\f"; break;
+ case '\n': O << "\\n"; break;
+ case '\r': O << "\\r"; break;
+ case '\t': O << "\\t"; break;
+ default:
+ O << '\\';
+ O << toOctal(C >> 6);
+ O << toOctal(C >> 3);
+ O << toOctal(C >> 0);
+ break;
+ }
+ }
+}
+
+/// EmitString - Emit a string with quotes and a null terminator.
+/// Special characters are emitted properly.
+/// \literal (Eg. '\t') \endliteral
+void AsmPrinter::EmitString(const std::string &String) const {
+ const char* AscizDirective = TAI->getAscizDirective();
+ if (AscizDirective)
+ O << AscizDirective;
+ else
+ O << TAI->getAsciiDirective();
+ O << "\"";
+ for (unsigned i = 0, N = String.size(); i < N; ++i) {
+ unsigned char C = String[i];
+ printStringChar(O, C);
+ }
+ if (AscizDirective)
+ O << "\"";
+ else
+ O << "\\0\"";
+}
+
+
+//===----------------------------------------------------------------------===//
+
+// 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) const {
+ if (GV && GV->getAlignment())
+ NumBits = Log2_32(GV->getAlignment());
+ NumBits = std::max(NumBits, ForcedAlignBits);
+
+ if (NumBits == 0) return; // No need to emit alignment.
+ if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
+ O << TAI->getAlignDirective() << NumBits << "\n";
+}
+
+
+/// EmitZeros - Emit a block of zeros.
+///
+void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
+ if (NumZeros) {
+ if (TAI->getZeroDirective()) {
+ O << TAI->getZeroDirective() << NumZeros;
+ if (TAI->getZeroDirectiveSuffix())
+ O << TAI->getZeroDirectiveSuffix();
+ O << "\n";
+ } else {
+ for (; NumZeros; --NumZeros)
+ O << TAI->getData8bitsDirective() << "0\n";
+ }
+ }
+}
+
+// Print out the specified constant, without a storage class. Only the
+// constants valid in constant expressions can occur here.
+void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
+ if (CV->isNullValue() || isa<UndefValue>(CV))
+ O << "0";
+ else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
+ O << CI->getZExtValue();
+ } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
+ // This is a constant address for a global variable or function. Use the
+ // name of the variable or function as the address value, possibly
+ // decorating it with GlobalVarAddrPrefix/Suffix or
+ // FunctionAddrPrefix/Suffix (these all default to "" )
+ if (isa<Function>(GV)) {
+ O << TAI->getFunctionAddrPrefix()
+ << Mang->getValueName(GV)
+ << TAI->getFunctionAddrSuffix();
+ } else {
+ O << TAI->getGlobalVarAddrPrefix()
+ << Mang->getValueName(GV)
+ << TAI->getGlobalVarAddrSuffix();
+ }
+ } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
+ const TargetData *TD = TM.getTargetData();
+ unsigned Opcode = CE->getOpcode();
+ switch (Opcode) {
+ case Instruction::GetElementPtr: {
+ // 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());
+ if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
+ idxVec.size())) {
+ if (Offset)
+ O << "(";
+ EmitConstantValueOnly(ptrVal);
+ if (Offset > 0)
+ O << ") + " << Offset;
+ else if (Offset < 0)
+ O << ") - " << -Offset;
+ } else {
+ EmitConstantValueOnly(ptrVal);
+ }
+ break;
+ }
+ case Instruction::Trunc:
+ case Instruction::ZExt:
+ case Instruction::SExt:
+ case Instruction::FPTrunc:
+ case Instruction::FPExt:
+ case Instruction::UIToFP:
+ case Instruction::SIToFP:
+ case Instruction::FPToUI:
+ case Instruction::FPToSI:
+ assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
+ break;
+ case Instruction::BitCast:
+ return EmitConstantValueOnly(CE->getOperand(0));
+
+ case Instruction::IntToPtr: {
+ // 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(), false/*ZExt*/);
+ return EmitConstantValueOnly(Op);
+ }
+
+
+ case Instruction::PtrToInt: {
+ // 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();
+
+ // We can emit the pointer value into this slot if the slot is an
+ // integer slot greater or equal to the size of the pointer.
+ if (Ty->isInteger() &&
+ TD->getTypeSize(Ty) >= TD->getTypeSize(Op->getType()))
+ return EmitConstantValueOnly(Op);
+
+ assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
+ EmitConstantValueOnly(Op);
+ break;
+ }
+ case Instruction::Add:
+ case Instruction::Sub:
+ O << "(";
+ EmitConstantValueOnly(CE->getOperand(0));
+ O << (Opcode==Instruction::Add ? ") + (" : ") - (");
+ EmitConstantValueOnly(CE->getOperand(1));
+ O << ")";
+ break;
+ default:
+ assert(0 && "Unsupported operator!");
+ }
+ } else {
+ assert(0 && "Unknown constant value!");
+ }
+}
+
+/// printAsCString - Print the specified array as a C compatible string, only if
+/// the predicate isString is true.
+///
+static void printAsCString(std::ostream &O, const ConstantArray *CVA,
+ unsigned LastElt) {
+ assert(CVA->isString() && "Array is not string compatible!");
+
+ O << "\"";
+ for (unsigned i = 0; i != LastElt; ++i) {
+ unsigned char C =
+ (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
+ printStringChar(O, C);
+ }
+ O << "\"";
+}
+
+/// EmitString - Emit a zero-byte-terminated string constant.
+///
+void AsmPrinter::EmitString(const ConstantArray *CVA) const {
+ unsigned NumElts = CVA->getNumOperands();
+ if (TAI->getAscizDirective() && NumElts &&
+ cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
+ O << TAI->getAscizDirective();
+ printAsCString(O, CVA, NumElts-1);
+ } else {
+ O << TAI->getAsciiDirective();
+ printAsCString(O, CVA, NumElts);
+ }
+ O << "\n";
+}
+
+/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
+///
+void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
+ const TargetData *TD = TM.getTargetData();
+
+ if (CV->isNullValue() || isa<UndefValue>(CV)) {
+ EmitZeros(TD->getTypeSize(CV->getType()));
+ return;
+ } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
+ if (CVA->isString()) {
+ EmitString(CVA);
+ } else { // Not a string. Print the values in successive locations
+ for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
+ EmitGlobalConstant(CVA->getOperand(i));
+ }
+ return;
+ } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
+ // Print the fields in successive locations. Pad to align if needed!
+ const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
+ uint64_t sizeSoFar = 0;
+ for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
+ const Constant* field = CVS->getOperand(i);
+
+ // Check if padding is needed and insert one or more 0s.
+ uint64_t fieldSize = TD->getTypeSize(field->getType());
+ uint64_t padSize = ((i == e-1? cvsLayout->getSizeInBytes()
+ : cvsLayout->getElementOffset(i+1))
+ - cvsLayout->getElementOffset(i)) - fieldSize;
+ sizeSoFar += fieldSize + padSize;
+
+ // Now print the actual field value
+ EmitGlobalConstant(field);
+
+ // Insert the field padding unless it's zero bytes...
+ EmitZeros(padSize);
+ }
+ assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
+ "Layout of constant struct may be incorrect!");
+ return;
+ } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
+ // FP Constants are printed as integer constants to avoid losing
+ // precision...
+ double Val = CFP->getValue();
+ if (CFP->getType() == Type::DoubleTy) {
+ if (TAI->getData64bitsDirective())
+ O << TAI->getData64bitsDirective() << DoubleToBits(Val) << "\t"
+ << TAI->getCommentString() << " double value: " << Val << "\n";
+ else if (TD->isBigEndian()) {
+ O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
+ << "\t" << TAI->getCommentString()
+ << " double most significant word " << Val << "\n";
+ O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
+ << "\t" << TAI->getCommentString()
+ << " double least significant word " << Val << "\n";
+ } else {
+ O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
+ << "\t" << TAI->getCommentString()
+ << " double least significant word " << Val << "\n";
+ O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
+ << "\t" << TAI->getCommentString()
+ << " double most significant word " << Val << "\n";
+ }
+ return;
+ } else {
+ O << TAI->getData32bitsDirective() << FloatToBits(Val)
+ << "\t" << TAI->getCommentString() << " float " << Val << "\n";
+ return;
+ }
+ } else if (CV->getType() == Type::Int64Ty) {
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
+ uint64_t Val = CI->getZExtValue();
+
+ if (TAI->getData64bitsDirective())
+ O << TAI->getData64bitsDirective() << Val << "\n";
+ else if (TD->isBigEndian()) {
+ O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
+ << "\t" << TAI->getCommentString()
+ << " Double-word most significant word " << Val << "\n";
+ O << TAI->getData32bitsDirective() << unsigned(Val)
+ << "\t" << TAI->getCommentString()
+ << " Double-word least significant word " << Val << "\n";
+ } else {
+ O << TAI->getData32bitsDirective() << unsigned(Val)
+ << "\t" << TAI->getCommentString()
+ << " Double-word least significant word " << Val << "\n";
+ O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
+ << "\t" << TAI->getCommentString()
+ << " Double-word most significant word " << Val << "\n";
+ }
+ return;
+ }
+ } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
+ const VectorType *PTy = CP->getType();
+
+ for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
+ EmitGlobalConstant(CP->getOperand(I));
+
+ return;
+ }
+
+ const Type *type = CV->getType();
+ printDataDirective(type);
+ EmitConstantValueOnly(CV);
+ O << "\n";
+}
+
+void
+AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
+ // Target doesn't support this yet!
+ abort();
+}
+
+/// 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) {
+ if (!strcmp(Code, "private")) {
+ O << TAI->getPrivateGlobalPrefix();
+ } else if (!strcmp(Code, "comment")) {
+ O << TAI->getCommentString();
+ } else if (!strcmp(Code, "uid")) {
+ // Assign a unique ID to this machine instruction.
+ static const MachineInstr *LastMI = 0;
+ static const Function *F = 0;
+ static unsigned Counter = 0U-1;
+
+ // 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 machine instruction, bump the counter.
+ if (LastMI != MI || F != ThisF) {
+ ++Counter;
+ LastMI = MI;
+ F = ThisF;
+ }
+ O << Counter;
+ } else {
+ cerr << "Unknown special formatter '" << Code
+ << "' for machine instr: " << *MI;
+ exit(1);
+ }
+}
+
+
+/// 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).isExternalSymbol() && "No asm string?");
+
+ // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
+ const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
+
+ // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
+ if (AsmStr[0] == 0) {
+ O << "\n"; // Tab already printed, avoid double indenting next instr.
+ return;
+ }
+
+ O << TAI->getInlineAsmStart() << "\n\t";
+
+ // The variant of the current asmprinter.
+ int AsmPrinterVariant = TAI->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) {
+ cerr << "Nested variants found in inline asm string: '"
+ << AsmStr << "'\n";
+ exit(1);
+ }
+ CurVariant = 0; // We're in the first variant now.
+ break;
+ case '|':
+ ++LastEmitted; // consume '|' character.
+ if (CurVariant == -1) {
+ cerr << "Found '|' character outside of variant in inline asm "
+ << "string: '" << AsmStr << "'\n";
+ exit(1);
+ }
+ ++CurVariant; // We're in the next variant.
+ break;
+ case ')': // $) -> same as GCC's } char.
+ ++LastEmitted; // consume ')' character.
+ if (CurVariant == -1) {
+ cerr << "Found '}' character outside of variant in inline asm "
+ << "string: '" << AsmStr << "'\n";
+ exit(1);
+ }
+ CurVariant = -1;
+ break;
+ }
+ if (Done) break;
+
+ bool HasCurlyBraces = false;
+ if (*LastEmitted == '{') { // ${variable}
+ ++LastEmitted; // Consume '{' character.
+ HasCurlyBraces = true;
+ }
+
+ 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)) {
+ cerr << "Bad $ operand number in inline asm string: '"
+ << AsmStr << "'\n";
+ exit(1);
+ }
+ 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) {
+ cerr << "Bad ${:} expression in inline asm string: '"
+ << AsmStr << "'\n";
+ exit(1);
+ }
+
+ Modifier[0] = *LastEmitted;
+ ++LastEmitted; // Consume modifier character.
+ }
+
+ if (*LastEmitted != '}') {
+ cerr << "Bad ${} expression in inline asm string: '"
+ << AsmStr << "'\n";
+ exit(1);
+ }
+ ++LastEmitted; // Consume '}' character.
+ }
+
+ if ((unsigned)Val >= NumOperands-1) {
+ cerr << "Invalid $ operand number in inline asm string: '"
+ << AsmStr << "'\n";
+ exit(1);
+ }
+
+ // 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).getImmedValue();
+ OpNo += (OpFlags >> 3) + 1;
+ }
+
+ if (OpNo >= MI->getNumOperands()) {
+ Error = true;
+ } else {
+ unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
+ ++OpNo; // Skip over the ID number.
+
+ AsmPrinter *AP = const_cast<AsmPrinter*>(this);
+ if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
+ Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
+ Modifier[0] ? Modifier : 0);
+ } else {
+ Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
+ Modifier[0] ? Modifier : 0);
+ }
+ }
+ if (Error) {
+ cerr << "Invalid operand found in inline asm: '"
+ << AsmStr << "'\n";
+ MI->dump();
+ exit(1);
+ }
+ }
+ break;
+ }
+ }
+ }
+ O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
+}
+
+/// printLabel - This method prints a local label used by debug and
+/// exception handling tables.
+void AsmPrinter::printLabel(const MachineInstr *MI) const {
+ O << "\n"
+ << TAI->getPrivateGlobalPrefix()
+ << "label"
+ << MI->getOperand(0).getImmedValue()
+ << ":\n";
+}
+
+/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
+/// instruction, using the specified assembler variant. Targets should
+/// overried 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;
+}
+
+/// printBasicBlockLabel - This method prints the label for the specified
+/// MachineBasicBlock
+void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
+ bool printColon,
+ bool printComment) const {
+ O << TAI->getPrivateGlobalPrefix() << "BB" << FunctionNumber << "_"
+ << MBB->getNumber();
+ if (printColon)
+ O << ':';
+ if (printComment && MBB->getBasicBlock())
+ O << '\t' << TAI->getCommentString() << MBB->getBasicBlock()->getName();
+}
+
+/// printSetLabel - This method prints a set label for the specified
+/// MachineBasicBlock
+void AsmPrinter::printSetLabel(unsigned uid,
+ const MachineBasicBlock *MBB) const {
+ if (!TAI->getSetDirective())
+ return;
+
+ O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
+ << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
+ printBasicBlockLabel(MBB, false, false);
+ O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
+ << '_' << uid << '\n';
+}
+
+void AsmPrinter::printSetLabel(unsigned uid, unsigned uid2,
+ const MachineBasicBlock *MBB) const {
+ if (!TAI->getSetDirective())
+ return;
+
+ O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
+ << getFunctionNumber() << '_' << uid << '_' << uid2
+ << "_set_" << MBB->getNumber() << ',';
+ printBasicBlockLabel(MBB, false, false);
+ O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
+ << '_' << uid << '_' << uid2 << '\n';
+}
+
+/// printDataDirective - This method prints the asm directive for the
+/// specified type.
+void AsmPrinter::printDataDirective(const Type *type) {
+ const TargetData *TD = TM.getTargetData();
+ switch (type->getTypeID()) {
+ case Type::IntegerTyID: {
+ unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
+ if (BitWidth <= 8)
+ O << TAI->getData8bitsDirective();
+ else if (BitWidth <= 16)
+ O << TAI->getData16bitsDirective();
+ else if (BitWidth <= 32)
+ O << TAI->getData32bitsDirective();
+ else if (BitWidth <= 64) {
+ assert(TAI->getData64bitsDirective() &&
+ "Target cannot handle 64-bit constant exprs!");
+ O << TAI->getData64bitsDirective();
+ }
+ break;
+ }
+ case Type::PointerTyID:
+ if (TD->getPointerSize() == 8) {
+ assert(TAI->getData64bitsDirective() &&
+ "Target cannot handle 64-bit pointer exprs!");
+ O << TAI->getData64bitsDirective();
+ } else {
+ O << TAI->getData32bitsDirective();
+ }
+ break;
+ case Type::FloatTyID: case Type::DoubleTyID:
+ assert (0 && "Should have already output floating point constant.");
+ default:
+ assert (0 && "Can't handle printing this type of thing");
+ break;
+ }
+}
+