forked from OSchip/llvm-project
260 lines
8.5 KiB
C++
260 lines
8.5 KiB
C++
//===-- AsmPrinterDwarf.cpp - AsmPrinter Dwarf Support --------------------===//
|
|
//
|
|
// 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 Dwarf emissions parts of AsmPrinter.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "ByteStreamer.h"
|
|
#include "DwarfDebug.h"
|
|
#include "DwarfExpression.h"
|
|
#include "llvm/ADT/Twine.h"
|
|
#include "llvm/BinaryFormat/Dwarf.h"
|
|
#include "llvm/CodeGen/AsmPrinter.h"
|
|
#include "llvm/CodeGen/DIE.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/MachineModuleInfo.h"
|
|
#include "llvm/IR/DataLayout.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCRegisterInfo.h"
|
|
#include "llvm/MC/MCSection.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/MC/MachineLocation.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Target/TargetLoweringObjectFile.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetSubtargetInfo.h"
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "asm-printer"
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Dwarf Emission Helper Routines
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// EmitSLEB128 - emit the specified signed leb128 value.
|
|
void AsmPrinter::EmitSLEB128(int64_t Value, const char *Desc) const {
|
|
if (isVerbose() && Desc)
|
|
OutStreamer->AddComment(Desc);
|
|
|
|
OutStreamer->EmitSLEB128IntValue(Value);
|
|
}
|
|
|
|
/// EmitULEB128 - emit the specified unsigned leb128 value.
|
|
void AsmPrinter::EmitULEB128(uint64_t Value, const char *Desc,
|
|
unsigned PadTo) const {
|
|
if (isVerbose() && Desc)
|
|
OutStreamer->AddComment(Desc);
|
|
|
|
OutStreamer->EmitULEB128IntValue(Value, PadTo);
|
|
}
|
|
|
|
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 AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const {
|
|
if (isVerbose()) {
|
|
if (Desc)
|
|
OutStreamer->AddComment(Twine(Desc) + " Encoding = " +
|
|
Twine(DecodeDWARFEncoding(Val)));
|
|
else
|
|
OutStreamer->AddComment(Twine("Encoding = ") + DecodeDWARFEncoding(Val));
|
|
}
|
|
|
|
OutStreamer->EmitIntValue(Val, 1);
|
|
}
|
|
|
|
/// GetSizeOfEncodedValue - Return the size of the encoding in bytes.
|
|
unsigned AsmPrinter::GetSizeOfEncodedValue(unsigned Encoding) const {
|
|
if (Encoding == dwarf::DW_EH_PE_omit)
|
|
return 0;
|
|
|
|
switch (Encoding & 0x07) {
|
|
default:
|
|
llvm_unreachable("Invalid encoded value.");
|
|
case dwarf::DW_EH_PE_absptr:
|
|
return MF->getDataLayout().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;
|
|
}
|
|
}
|
|
|
|
void AsmPrinter::EmitTTypeReference(const GlobalValue *GV,
|
|
unsigned Encoding) const {
|
|
if (GV) {
|
|
const TargetLoweringObjectFile &TLOF = getObjFileLowering();
|
|
|
|
const MCExpr *Exp =
|
|
TLOF.getTTypeGlobalReference(GV, Encoding, TM, MMI, *OutStreamer);
|
|
OutStreamer->EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
|
|
} else
|
|
OutStreamer->EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
|
|
}
|
|
|
|
void AsmPrinter::emitDwarfSymbolReference(const MCSymbol *Label,
|
|
bool ForceOffset) const {
|
|
if (!ForceOffset) {
|
|
// On COFF targets, we have to emit the special .secrel32 directive.
|
|
if (MAI->needsDwarfSectionOffsetDirective()) {
|
|
OutStreamer->EmitCOFFSecRel32(Label, /*Offset=*/0);
|
|
return;
|
|
}
|
|
|
|
// If the format uses relocations with dwarf, refer to the symbol directly.
|
|
if (MAI->doesDwarfUseRelocationsAcrossSections()) {
|
|
OutStreamer->EmitSymbolValue(Label, 4);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Otherwise, emit it as a label difference from the start of the section.
|
|
EmitLabelDifference(Label, Label->getSection().getBeginSymbol(), 4);
|
|
}
|
|
|
|
void AsmPrinter::emitDwarfStringOffset(DwarfStringPoolEntryRef S) const {
|
|
if (MAI->doesDwarfUseRelocationsAcrossSections()) {
|
|
emitDwarfSymbolReference(S.getSymbol());
|
|
return;
|
|
}
|
|
|
|
// Just emit the offset directly; no need for symbol math.
|
|
EmitInt32(S.getOffset());
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Dwarf Lowering Routines
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void AsmPrinter::emitCFIInstruction(const MCCFIInstruction &Inst) const {
|
|
switch (Inst.getOperation()) {
|
|
default:
|
|
llvm_unreachable("Unexpected instruction");
|
|
case MCCFIInstruction::OpDefCfaOffset:
|
|
OutStreamer->EmitCFIDefCfaOffset(Inst.getOffset());
|
|
break;
|
|
case MCCFIInstruction::OpAdjustCfaOffset:
|
|
OutStreamer->EmitCFIAdjustCfaOffset(Inst.getOffset());
|
|
break;
|
|
case MCCFIInstruction::OpDefCfa:
|
|
OutStreamer->EmitCFIDefCfa(Inst.getRegister(), Inst.getOffset());
|
|
break;
|
|
case MCCFIInstruction::OpDefCfaRegister:
|
|
OutStreamer->EmitCFIDefCfaRegister(Inst.getRegister());
|
|
break;
|
|
case MCCFIInstruction::OpOffset:
|
|
OutStreamer->EmitCFIOffset(Inst.getRegister(), Inst.getOffset());
|
|
break;
|
|
case MCCFIInstruction::OpRegister:
|
|
OutStreamer->EmitCFIRegister(Inst.getRegister(), Inst.getRegister2());
|
|
break;
|
|
case MCCFIInstruction::OpWindowSave:
|
|
OutStreamer->EmitCFIWindowSave();
|
|
break;
|
|
case MCCFIInstruction::OpSameValue:
|
|
OutStreamer->EmitCFISameValue(Inst.getRegister());
|
|
break;
|
|
case MCCFIInstruction::OpGnuArgsSize:
|
|
OutStreamer->EmitCFIGnuArgsSize(Inst.getOffset());
|
|
break;
|
|
case MCCFIInstruction::OpEscape:
|
|
OutStreamer->EmitCFIEscape(Inst.getValues());
|
|
break;
|
|
}
|
|
}
|
|
|
|
void AsmPrinter::emitDwarfDIE(const DIE &Die) const {
|
|
// Emit the code (index) for the abbreviation.
|
|
if (isVerbose())
|
|
OutStreamer->AddComment("Abbrev [" + Twine(Die.getAbbrevNumber()) + "] 0x" +
|
|
Twine::utohexstr(Die.getOffset()) + ":0x" +
|
|
Twine::utohexstr(Die.getSize()) + " " +
|
|
dwarf::TagString(Die.getTag()));
|
|
EmitULEB128(Die.getAbbrevNumber());
|
|
|
|
// Emit the DIE attribute values.
|
|
for (const auto &V : Die.values()) {
|
|
dwarf::Attribute Attr = V.getAttribute();
|
|
assert(V.getForm() && "Too many attributes for DIE (check abbreviation)");
|
|
|
|
if (isVerbose()) {
|
|
OutStreamer->AddComment(dwarf::AttributeString(Attr));
|
|
if (Attr == dwarf::DW_AT_accessibility)
|
|
OutStreamer->AddComment(
|
|
dwarf::AccessibilityString(V.getDIEInteger().getValue()));
|
|
}
|
|
|
|
// Emit an attribute using the defined form.
|
|
V.EmitValue(this);
|
|
}
|
|
|
|
// Emit the DIE children if any.
|
|
if (Die.hasChildren()) {
|
|
for (auto &Child : Die.children())
|
|
emitDwarfDIE(Child);
|
|
|
|
OutStreamer->AddComment("End Of Children Mark");
|
|
EmitInt8(0);
|
|
}
|
|
}
|
|
|
|
void AsmPrinter::emitDwarfAbbrev(const DIEAbbrev &Abbrev) const {
|
|
// Emit the abbreviations code (base 1 index.)
|
|
EmitULEB128(Abbrev.getNumber(), "Abbreviation Code");
|
|
|
|
// Emit the abbreviations data.
|
|
Abbrev.Emit(this);
|
|
}
|