Split out the Dwarf writer stuff into separate files. This is a much more
logical/sane approach to organizing all of the stuff that goes into writing out
DWARF information. Honestly? even this is too complex for what it's supposed to
be doing.
Trivia: It *looks* like there would be functionality changes, however there aren't!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71821 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfPrinter.cpp b/lib/CodeGen/AsmPrinter/DwarfPrinter.cpp
new file mode 100644
index 0000000..45e7dd3
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfPrinter.cpp
@@ -0,0 +1,235 @@
+//===--- 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/MachineModuleInfo.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetFrameInfo.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include <ostream>
+
+using namespace llvm;
+
+Dwarf::Dwarf(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T,
+ const char *flavor)
+: O(OS), Asm(A), TAI(T), TD(Asm->TM.getTargetData()),
+ RI(Asm->TM.getRegisterInfo()), M(NULL), MF(NULL), MMI(NULL),
+ SubprogramCount(0), Flavor(flavor), SetCounter(1) {}
+
+void Dwarf::PrintRelDirective(bool Force32Bit, bool isInSection) const {
+ if (isInSection && TAI->getDwarfSectionOffsetDirective())
+ O << TAI->getDwarfSectionOffsetDirective();
+ else if (Force32Bit || TD->getPointerSize() == sizeof(int32_t))
+ O << TAI->getData32bitsDirective();
+ else
+ O << TAI->getData64bitsDirective();
+}
+
+/// PrintLabelName - Print label name in form used by Dwarf writer.
+///
+void Dwarf::PrintLabelName(const char *Tag, unsigned Number) const {
+ O << TAI->getPrivateGlobalPrefix() << Tag;
+ if (Number) O << Number;
+}
+void Dwarf::PrintLabelName(const char *Tag, unsigned Number,
+ const char *Suffix) const {
+ O << TAI->getPrivateGlobalPrefix() << Tag;
+ if (Number) O << Number;
+ O << Suffix;
+}
+
+/// EmitLabel - Emit location label for internal use by Dwarf.
+///
+void Dwarf::EmitLabel(const char *Tag, unsigned Number) const {
+ PrintLabelName(Tag, Number);
+ O << ":\n";
+}
+
+/// EmitReference - Emit a reference to a label.
+///
+void Dwarf::EmitReference(const char *Tag, unsigned Number,
+ bool IsPCRelative, bool Force32Bit) const {
+ PrintRelDirective(Force32Bit);
+ PrintLabelName(Tag, Number);
+ if (IsPCRelative) O << "-" << TAI->getPCSymbol();
+}
+void Dwarf::EmitReference(const std::string &Name, bool IsPCRelative,
+ bool Force32Bit) const {
+ PrintRelDirective(Force32Bit);
+ O << Name;
+ if (IsPCRelative) O << "-" << TAI->getPCSymbol();
+}
+
+/// EmitDifference - Emit the difference between two labels. Some assemblers do
+/// not behave with absolute expressions with data directives, so there is an
+/// option (needsSet) to use an intermediary set expression.
+void Dwarf::EmitDifference(const char *TagHi, unsigned NumberHi,
+ const char *TagLo, unsigned NumberLo,
+ bool IsSmall) {
+ if (TAI->needsSet()) {
+ 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 Dwarf::EmitSectionOffset(const char* Label, const char* Section,
+ unsigned LabelNumber, unsigned SectionNumber,
+ bool IsSmall, bool isEH,
+ bool useSet) {
+ bool printAbsolute = false;
+ if (isEH)
+ printAbsolute = TAI->isAbsoluteEHSectionOffsets();
+ else
+ printAbsolute = TAI->isAbsoluteDebugSectionOffsets();
+
+ if (TAI->needsSet() && useSet) {
+ 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;
+ } else {
+ PrintRelDirective(IsSmall, true);
+ PrintLabelName(Label, LabelNumber);
+
+ if (!printAbsolute) {
+ O << "-";
+ PrintLabelName(Section, SectionNumber);
+ }
+ }
+}
+
+/// EmitFrameMoves - Emit frame instructions to describe the layout of the
+/// frame.
+void Dwarf::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)) {
+ Asm->EmitInt8(dwarf::DW_CFA_advance_loc4);
+ Asm->EOL("DW_CFA_advance_loc4");
+ EmitDifference("label", LabelID, BaseLabel, BaseLabelID, true);
+ Asm->EOL();
+
+ BaseLabelID = LabelID;
+ BaseLabel = "label";
+ IsLocal = true;
+ }
+
+ // If advancing cfa.
+ if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
+ if (!Src.isReg()) {
+ if (Src.getReg() == MachineLocation::VirtualFP) {
+ Asm->EmitInt8(dwarf::DW_CFA_def_cfa_offset);
+ Asm->EOL("DW_CFA_def_cfa_offset");
+ } else {
+ Asm->EmitInt8(dwarf::DW_CFA_def_cfa);
+ Asm->EOL("DW_CFA_def_cfa");
+ Asm->EmitULEB128Bytes(RI->getDwarfRegNum(Src.getReg(), isEH));
+ Asm->EOL("Register");
+ }
+
+ int Offset = -Src.getOffset();
+
+ Asm->EmitULEB128Bytes(Offset);
+ Asm->EOL("Offset");
+ } else {
+ assert(0 && "Machine move no supported yet.");
+ }
+ } else if (Src.isReg() &&
+ Src.getReg() == MachineLocation::VirtualFP) {
+ if (Dst.isReg()) {
+ Asm->EmitInt8(dwarf::DW_CFA_def_cfa_register);
+ Asm->EOL("DW_CFA_def_cfa_register");
+ Asm->EmitULEB128Bytes(RI->getDwarfRegNum(Dst.getReg(), isEH));
+ Asm->EOL("Register");
+ } else {
+ assert(0 && "Machine move no supported yet.");
+ }
+ } else {
+ unsigned Reg = RI->getDwarfRegNum(Src.getReg(), isEH);
+ int Offset = Dst.getOffset() / stackGrowth;
+
+ if (Offset < 0) {
+ Asm->EmitInt8(dwarf::DW_CFA_offset_extended_sf);
+ Asm->EOL("DW_CFA_offset_extended_sf");
+ Asm->EmitULEB128Bytes(Reg);
+ Asm->EOL("Reg");
+ Asm->EmitSLEB128Bytes(Offset);
+ Asm->EOL("Offset");
+ } else if (Reg < 64) {
+ Asm->EmitInt8(dwarf::DW_CFA_offset + Reg);
+ if (Asm->isVerbose())
+ Asm->EOL("DW_CFA_offset + Reg (" + utostr(Reg) + ")");
+ else
+ Asm->EOL();
+ Asm->EmitULEB128Bytes(Offset);
+ Asm->EOL("Offset");
+ } else {
+ Asm->EmitInt8(dwarf::DW_CFA_offset_extended);
+ Asm->EOL("DW_CFA_offset_extended");
+ Asm->EmitULEB128Bytes(Reg);
+ Asm->EOL("Reg");
+ Asm->EmitULEB128Bytes(Offset);
+ Asm->EOL("Offset");
+ }
+ }
+ }
+}