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f955a6ef49
This adds location info for all llvm_unreachable calls (which is a macro now) in !NDEBUG builds. In NDEBUG builds location info and the message is off (it only prints "UREACHABLE executed"). llvm-svn: 75640
236 lines
7.5 KiB
C++
236 lines
7.5 KiB
C++
//===--- lib/CodeGen/DwarfPrinter.cpp - Dwarf Printer ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Emit general DWARF directives.
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//
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//===----------------------------------------------------------------------===//
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#include "DwarfPrinter.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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using namespace llvm;
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Dwarf::Dwarf(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T,
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const char *flavor)
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: O(OS), Asm(A), TAI(T), TD(Asm->TM.getTargetData()),
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RI(Asm->TM.getRegisterInfo()), M(NULL), MF(NULL), MMI(NULL),
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SubprogramCount(0), Flavor(flavor), SetCounter(1) {}
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void Dwarf::PrintRelDirective(bool Force32Bit, bool isInSection) const {
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if (isInSection && TAI->getDwarfSectionOffsetDirective())
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O << TAI->getDwarfSectionOffsetDirective();
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else if (Force32Bit || TD->getPointerSize() == sizeof(int32_t))
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O << TAI->getData32bitsDirective();
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else
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O << TAI->getData64bitsDirective();
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}
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/// PrintLabelName - Print label name in form used by Dwarf writer.
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///
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void Dwarf::PrintLabelName(const char *Tag, unsigned Number) const {
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O << TAI->getPrivateGlobalPrefix() << Tag;
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if (Number) O << Number;
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}
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void Dwarf::PrintLabelName(const char *Tag, unsigned Number,
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const char *Suffix) const {
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O << TAI->getPrivateGlobalPrefix() << Tag;
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if (Number) O << Number;
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O << Suffix;
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}
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/// EmitLabel - Emit location label for internal use by Dwarf.
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///
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void Dwarf::EmitLabel(const char *Tag, unsigned Number) const {
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PrintLabelName(Tag, Number);
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O << ":\n";
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}
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/// EmitReference - Emit a reference to a label.
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///
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void Dwarf::EmitReference(const char *Tag, unsigned Number,
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bool IsPCRelative, bool Force32Bit) const {
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PrintRelDirective(Force32Bit);
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PrintLabelName(Tag, Number);
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if (IsPCRelative) O << "-" << TAI->getPCSymbol();
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}
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void Dwarf::EmitReference(const std::string &Name, bool IsPCRelative,
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bool Force32Bit) const {
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PrintRelDirective(Force32Bit);
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O << Name;
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if (IsPCRelative) O << "-" << TAI->getPCSymbol();
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}
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/// EmitDifference - Emit the difference between two labels. Some assemblers do
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/// not behave with absolute expressions with data directives, so there is an
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/// option (needsSet) to use an intermediary set expression.
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void Dwarf::EmitDifference(const char *TagHi, unsigned NumberHi,
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const char *TagLo, unsigned NumberLo,
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bool IsSmall) {
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if (TAI->needsSet()) {
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O << "\t.set\t";
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PrintLabelName("set", SetCounter, Flavor);
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O << ",";
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PrintLabelName(TagHi, NumberHi);
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O << "-";
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PrintLabelName(TagLo, NumberLo);
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O << "\n";
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PrintRelDirective(IsSmall);
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PrintLabelName("set", SetCounter, Flavor);
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++SetCounter;
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} else {
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PrintRelDirective(IsSmall);
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PrintLabelName(TagHi, NumberHi);
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O << "-";
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PrintLabelName(TagLo, NumberLo);
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}
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}
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void Dwarf::EmitSectionOffset(const char* Label, const char* Section,
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unsigned LabelNumber, unsigned SectionNumber,
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bool IsSmall, bool isEH,
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bool useSet) {
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bool printAbsolute = false;
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if (isEH)
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printAbsolute = TAI->isAbsoluteEHSectionOffsets();
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else
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printAbsolute = TAI->isAbsoluteDebugSectionOffsets();
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if (TAI->needsSet() && useSet) {
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O << "\t.set\t";
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PrintLabelName("set", SetCounter, Flavor);
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O << ",";
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PrintLabelName(Label, LabelNumber);
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if (!printAbsolute) {
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O << "-";
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PrintLabelName(Section, SectionNumber);
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}
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O << "\n";
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PrintRelDirective(IsSmall);
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PrintLabelName("set", SetCounter, Flavor);
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++SetCounter;
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} else {
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PrintRelDirective(IsSmall, true);
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PrintLabelName(Label, LabelNumber);
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if (!printAbsolute) {
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O << "-";
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PrintLabelName(Section, SectionNumber);
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}
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}
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}
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/// EmitFrameMoves - Emit frame instructions to describe the layout of the
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/// frame.
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void Dwarf::EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
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const std::vector<MachineMove> &Moves, bool isEH) {
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int stackGrowth =
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Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
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TargetFrameInfo::StackGrowsUp ?
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TD->getPointerSize() : -TD->getPointerSize();
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bool IsLocal = BaseLabel && strcmp(BaseLabel, "label") == 0;
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for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
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const MachineMove &Move = Moves[i];
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unsigned LabelID = Move.getLabelID();
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if (LabelID) {
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LabelID = MMI->MappedLabel(LabelID);
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// Throw out move if the label is invalid.
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if (!LabelID) continue;
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}
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const MachineLocation &Dst = Move.getDestination();
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const MachineLocation &Src = Move.getSource();
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// Advance row if new location.
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if (BaseLabel && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
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Asm->EmitInt8(dwarf::DW_CFA_advance_loc4);
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Asm->EOL("DW_CFA_advance_loc4");
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EmitDifference("label", LabelID, BaseLabel, BaseLabelID, true);
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Asm->EOL();
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BaseLabelID = LabelID;
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BaseLabel = "label";
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IsLocal = true;
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}
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// If advancing cfa.
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if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
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if (!Src.isReg()) {
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if (Src.getReg() == MachineLocation::VirtualFP) {
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Asm->EmitInt8(dwarf::DW_CFA_def_cfa_offset);
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Asm->EOL("DW_CFA_def_cfa_offset");
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} else {
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Asm->EmitInt8(dwarf::DW_CFA_def_cfa);
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Asm->EOL("DW_CFA_def_cfa");
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Asm->EmitULEB128Bytes(RI->getDwarfRegNum(Src.getReg(), isEH));
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Asm->EOL("Register");
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}
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int Offset = -Src.getOffset();
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Asm->EmitULEB128Bytes(Offset);
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Asm->EOL("Offset");
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} else {
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llvm_unreachable("Machine move not supported yet.");
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}
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} else if (Src.isReg() &&
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Src.getReg() == MachineLocation::VirtualFP) {
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if (Dst.isReg()) {
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Asm->EmitInt8(dwarf::DW_CFA_def_cfa_register);
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Asm->EOL("DW_CFA_def_cfa_register");
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Asm->EmitULEB128Bytes(RI->getDwarfRegNum(Dst.getReg(), isEH));
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Asm->EOL("Register");
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} else {
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llvm_unreachable("Machine move not supported yet.");
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}
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} else {
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unsigned Reg = RI->getDwarfRegNum(Src.getReg(), isEH);
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int Offset = Dst.getOffset() / stackGrowth;
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if (Offset < 0) {
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Asm->EmitInt8(dwarf::DW_CFA_offset_extended_sf);
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Asm->EOL("DW_CFA_offset_extended_sf");
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Asm->EmitULEB128Bytes(Reg);
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Asm->EOL("Reg");
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Asm->EmitSLEB128Bytes(Offset);
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Asm->EOL("Offset");
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} else if (Reg < 64) {
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Asm->EmitInt8(dwarf::DW_CFA_offset + Reg);
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if (Asm->isVerbose())
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Asm->EOL("DW_CFA_offset + Reg (" + utostr(Reg) + ")");
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else
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Asm->EOL();
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Asm->EmitULEB128Bytes(Offset);
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Asm->EOL("Offset");
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} else {
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Asm->EmitInt8(dwarf::DW_CFA_offset_extended);
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Asm->EOL("DW_CFA_offset_extended");
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Asm->EmitULEB128Bytes(Reg);
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Asm->EOL("Reg");
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Asm->EmitULEB128Bytes(Offset);
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Asm->EOL("Offset");
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}
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}
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}
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}
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