mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-16 11:30:51 +00:00
0f4df6dc6f
This makes code that uses section relative expressions (debug info) simpler and less brittle. This is still a bit awkward as the symbol is created late and has to be stored in a mutable field. I will move the symbol creation earlier in the next patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231802 91177308-0d34-0410-b5e6-96231b3b80d8
301 lines
10 KiB
C++
301 lines
10 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/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/Dwarf.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 signed leb128 value.
|
|
void AsmPrinter::EmitULEB128(uint64_t Value, const char *Desc,
|
|
unsigned PadTo) const {
|
|
if (isVerbose() && Desc)
|
|
OutStreamer.AddComment(Desc);
|
|
|
|
OutStreamer.EmitULEB128IntValue(Value, PadTo);
|
|
}
|
|
|
|
/// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
|
|
void AsmPrinter::EmitCFAByte(unsigned Val) const {
|
|
if (isVerbose()) {
|
|
if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset + 64)
|
|
OutStreamer.AddComment("DW_CFA_offset + Reg (" +
|
|
Twine(Val - dwarf::DW_CFA_offset) + ")");
|
|
else
|
|
OutStreamer.AddComment(dwarf::CallFrameString(Val));
|
|
}
|
|
OutStreamer.EmitIntValue(Val, 1);
|
|
}
|
|
|
|
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 TM.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, *Mang, TM, MMI, OutStreamer);
|
|
OutStreamer.EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
|
|
} else
|
|
OutStreamer.EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
|
|
}
|
|
|
|
/// EmitSectionOffset - Emit the 4-byte offset of Label from the start of its
|
|
/// section. This can be done with a special directive if the target supports
|
|
/// it (e.g. cygwin) or by emitting it as an offset from a label at the start
|
|
/// of the section.
|
|
///
|
|
/// SectionLabel is a temporary label emitted at the start of the section that
|
|
/// Label lives in.
|
|
void AsmPrinter::emitSectionOffset(const MCSymbol *Label) const {
|
|
// On COFF targets, we have to emit the special .secrel32 directive.
|
|
if (MAI->needsDwarfSectionOffsetDirective()) {
|
|
OutStreamer.EmitCOFFSecRel32(Label);
|
|
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);
|
|
}
|
|
|
|
/// EmitDwarfRegOp - Emit dwarf register operation.
|
|
void AsmPrinter::EmitDwarfRegOp(ByteStreamer &Streamer,
|
|
const MachineLocation &MLoc) const {
|
|
DebugLocDwarfExpression Expr(*MF->getSubtarget().getRegisterInfo(),
|
|
getDwarfDebug()->getDwarfVersion(), Streamer);
|
|
const MCRegisterInfo *MRI = MMI->getContext().getRegisterInfo();
|
|
int Reg = MRI->getDwarfRegNum(MLoc.getReg(), false);
|
|
if (Reg < 0) {
|
|
// We assume that pointers are always in an addressable register.
|
|
if (MLoc.isIndirect())
|
|
// FIXME: We have no reasonable way of handling errors in here. The
|
|
// caller might be in the middle of a dwarf expression. We should
|
|
// probably assert that Reg >= 0 once debug info generation is more
|
|
// mature.
|
|
return Expr.EmitOp(dwarf::DW_OP_nop,
|
|
"nop (could not find a dwarf register number)");
|
|
|
|
// Attempt to find a valid super- or sub-register.
|
|
if (!Expr.AddMachineRegPiece(MLoc.getReg()))
|
|
Expr.EmitOp(dwarf::DW_OP_nop,
|
|
"nop (could not find a dwarf register number)");
|
|
return;
|
|
}
|
|
|
|
if (MLoc.isIndirect())
|
|
Expr.AddRegIndirect(Reg, MLoc.getOffset());
|
|
else
|
|
Expr.AddReg(Reg);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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::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;
|
|
}
|
|
}
|
|
|
|
void AsmPrinter::emitDwarfDIE(const DIE &Die) const {
|
|
// Get the abbreviation for this DIE.
|
|
const DIEAbbrev &Abbrev = Die.getAbbrev();
|
|
|
|
// Emit the code (index) for the abbreviation.
|
|
if (isVerbose())
|
|
OutStreamer.AddComment("Abbrev [" + Twine(Abbrev.getNumber()) +
|
|
"] 0x" + Twine::utohexstr(Die.getOffset()) +
|
|
":0x" + Twine::utohexstr(Die.getSize()) + " " +
|
|
dwarf::TagString(Abbrev.getTag()));
|
|
EmitULEB128(Abbrev.getNumber());
|
|
|
|
const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
|
|
const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
|
|
|
|
// Emit the DIE attribute values.
|
|
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
|
|
dwarf::Attribute Attr = AbbrevData[i].getAttribute();
|
|
dwarf::Form Form = AbbrevData[i].getForm();
|
|
assert(Form && "Too many attributes for DIE (check abbreviation)");
|
|
|
|
if (isVerbose()) {
|
|
OutStreamer.AddComment(dwarf::AttributeString(Attr));
|
|
if (Attr == dwarf::DW_AT_accessibility)
|
|
OutStreamer.AddComment(dwarf::AccessibilityString(
|
|
cast<DIEInteger>(Values[i])->getValue()));
|
|
}
|
|
|
|
// Emit an attribute using the defined form.
|
|
Values[i]->EmitValue(this, Form);
|
|
}
|
|
|
|
// Emit the DIE children if any.
|
|
if (Abbrev.hasChildren()) {
|
|
for (auto &Child : Die.getChildren())
|
|
emitDwarfDIE(*Child);
|
|
|
|
OutStreamer.AddComment("End Of Children Mark");
|
|
EmitInt8(0);
|
|
}
|
|
}
|
|
|
|
void
|
|
AsmPrinter::emitDwarfAbbrevs(const std::vector<DIEAbbrev *>& Abbrevs) const {
|
|
// For each abbrevation.
|
|
for (const DIEAbbrev *Abbrev : Abbrevs) {
|
|
// Emit the abbrevations code (base 1 index.)
|
|
EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
|
|
|
|
// Emit the abbreviations data.
|
|
Abbrev->Emit(this);
|
|
}
|
|
|
|
// Mark end of abbreviations.
|
|
EmitULEB128(0, "EOM(3)");
|
|
}
|