mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-31 08:16:47 +00:00
20e3280f3f
by A.Mazur! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98360 91177308-0d34-0410-b5e6-96231b3b80d8
312 lines
11 KiB
C++
312 lines
11 KiB
C++
//===--- 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/MachineFunction.h"
|
|
#include "llvm/CodeGen/MachineModuleInfo.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/Target/TargetFrameInfo.h"
|
|
#include "llvm/Target/TargetLoweringObjectFile.h"
|
|
#include "llvm/Target/TargetRegisterInfo.h"
|
|
#include "llvm/Support/Dwarf.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/ADT/SmallString.h"
|
|
using namespace llvm;
|
|
|
|
DwarfPrinter::DwarfPrinter(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T)
|
|
: O(OS), Asm(A), MAI(T), TD(Asm->TM.getTargetData()),
|
|
RI(Asm->TM.getRegisterInfo()), M(NULL), MF(NULL), MMI(NULL),
|
|
SubprogramCount(0) {}
|
|
|
|
|
|
/// getDWLabel - Return the MCSymbol corresponding to the assembler temporary
|
|
/// label with the specified stem and unique ID.
|
|
MCSymbol *DwarfPrinter::getDWLabel(const char *Name, unsigned ID) const {
|
|
// FIXME: REMOVE this. However, there is stuff in EH that passes counters in
|
|
// here that can be zero.
|
|
|
|
//assert(ID && "Should use getTempLabel if no ID");
|
|
if (ID == 0) return getTempLabel(Name);
|
|
return Asm->OutContext.GetOrCreateTemporarySymbol
|
|
(Twine(MAI->getPrivateGlobalPrefix()) + Twine(Name) + Twine(ID));
|
|
}
|
|
|
|
/// getTempLabel - Return the MCSymbol corresponding to the assembler temporary
|
|
/// label with the specified name.
|
|
MCSymbol *DwarfPrinter::getTempLabel(const char *Name) const {
|
|
return Asm->OutContext.GetOrCreateTemporarySymbol
|
|
(Twine(MAI->getPrivateGlobalPrefix()) + Name);
|
|
}
|
|
|
|
|
|
/// SizeOfEncodedValue - Return the size of the encoding in bytes.
|
|
unsigned DwarfPrinter::SizeOfEncodedValue(unsigned Encoding) const {
|
|
if (Encoding == dwarf::DW_EH_PE_omit)
|
|
return 0;
|
|
|
|
switch (Encoding & 0x07) {
|
|
case dwarf::DW_EH_PE_absptr:
|
|
return TD->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;
|
|
}
|
|
|
|
assert(0 && "Invalid encoded value.");
|
|
return 0;
|
|
}
|
|
|
|
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 DwarfPrinter::EmitEncodingByte(unsigned Val, const char *Desc) {
|
|
if (Asm->VerboseAsm) {
|
|
if (Desc != 0)
|
|
Asm->OutStreamer.AddComment(Twine(Desc)+" Encoding = " +
|
|
Twine(DecodeDWARFEncoding(Val)));
|
|
else
|
|
Asm->OutStreamer.AddComment(Twine("Encoding = ") +
|
|
DecodeDWARFEncoding(Val));
|
|
}
|
|
|
|
Asm->OutStreamer.EmitIntValue(Val, 1, 0/*addrspace*/);
|
|
}
|
|
|
|
/// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
|
|
void DwarfPrinter::EmitCFAByte(unsigned Val) {
|
|
if (Asm->VerboseAsm) {
|
|
if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset+64)
|
|
Asm->OutStreamer.AddComment("DW_CFA_offset + Reg (" +
|
|
Twine(Val-dwarf::DW_CFA_offset) + ")");
|
|
else
|
|
Asm->OutStreamer.AddComment(dwarf::CallFrameString(Val));
|
|
}
|
|
Asm->OutStreamer.EmitIntValue(Val, 1, 0/*addrspace*/);
|
|
}
|
|
|
|
/// EmitSLEB128 - emit the specified signed leb128 value.
|
|
void DwarfPrinter::EmitSLEB128(int Value, const char *Desc) const {
|
|
if (Asm->VerboseAsm && Desc)
|
|
Asm->OutStreamer.AddComment(Desc);
|
|
|
|
if (MAI->hasLEB128()) {
|
|
// FIXME: MCize.
|
|
O << "\t.sleb128\t" << Value;
|
|
Asm->OutStreamer.AddBlankLine();
|
|
return;
|
|
}
|
|
|
|
// If we don't have .sleb128, emit as .bytes.
|
|
int Sign = Value >> (8 * sizeof(Value) - 1);
|
|
bool IsMore;
|
|
|
|
do {
|
|
unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
|
|
Value >>= 7;
|
|
IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
|
|
if (IsMore) Byte |= 0x80;
|
|
Asm->OutStreamer.EmitIntValue(Byte, 1, /*addrspace*/0);
|
|
} while (IsMore);
|
|
}
|
|
|
|
/// EmitULEB128 - emit the specified signed leb128 value.
|
|
void DwarfPrinter::EmitULEB128(unsigned Value, const char *Desc,
|
|
unsigned PadTo) const {
|
|
if (Asm->VerboseAsm && Desc)
|
|
Asm->OutStreamer.AddComment(Desc);
|
|
|
|
if (MAI->hasLEB128() && PadTo == 0) {
|
|
// FIXME: MCize.
|
|
O << "\t.uleb128\t" << Value;
|
|
Asm->OutStreamer.AddBlankLine();
|
|
return;
|
|
}
|
|
|
|
// If we don't have .uleb128 or we want to emit padding, emit as .bytes.
|
|
do {
|
|
unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
|
|
Value >>= 7;
|
|
if (Value || PadTo != 0) Byte |= 0x80;
|
|
Asm->OutStreamer.EmitIntValue(Byte, 1, /*addrspace*/0);
|
|
} while (Value);
|
|
|
|
if (PadTo) {
|
|
if (PadTo > 1)
|
|
Asm->OutStreamer.EmitFill(PadTo - 1, 0x80/*fillval*/, 0/*addrspace*/);
|
|
Asm->OutStreamer.EmitFill(1, 0/*fillval*/, 0/*addrspace*/);
|
|
}
|
|
}
|
|
|
|
|
|
void DwarfPrinter::EmitReference(const MCSymbol *Sym, unsigned Encoding) const {
|
|
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
|
|
|
|
const MCExpr *Exp = TLOF.getExprForDwarfReference(Sym, Asm->Mang,
|
|
Asm->MMI, Encoding,
|
|
Asm->OutStreamer);
|
|
Asm->OutStreamer.EmitValue(Exp, SizeOfEncodedValue(Encoding), /*addrspace*/0);
|
|
}
|
|
|
|
void DwarfPrinter::EmitReference(const GlobalValue *GV, unsigned Encoding)const{
|
|
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
|
|
|
|
const MCExpr *Exp =
|
|
TLOF.getExprForDwarfGlobalReference(GV, Asm->Mang, Asm->MMI, Encoding,
|
|
Asm->OutStreamer);
|
|
Asm->OutStreamer.EmitValue(Exp, SizeOfEncodedValue(Encoding), /*addrspace*/0);
|
|
}
|
|
|
|
/// EmitDifference - Emit the difference between two labels. If this assembler
|
|
/// supports .set, we emit a .set of a temporary and then use it in the .word.
|
|
void DwarfPrinter::EmitDifference(const MCSymbol *TagHi, const MCSymbol *TagLo,
|
|
bool IsSmall) {
|
|
unsigned Size = IsSmall ? 4 : TD->getPointerSize();
|
|
Asm->EmitLabelDifference(TagHi, TagLo, Size);
|
|
}
|
|
|
|
void DwarfPrinter::EmitSectionOffset(const MCSymbol *Label,
|
|
const MCSymbol *Section,
|
|
bool IsSmall, bool isEH) {
|
|
bool isAbsolute;
|
|
if (isEH)
|
|
isAbsolute = MAI->isAbsoluteEHSectionOffsets();
|
|
else
|
|
isAbsolute = MAI->isAbsoluteDebugSectionOffsets();
|
|
|
|
if (!isAbsolute)
|
|
return EmitDifference(Label, Section, IsSmall);
|
|
|
|
// On COFF targets, we have to emit the weird .secrel32 directive.
|
|
if (const char *SecOffDir = MAI->getDwarfSectionOffsetDirective()) {
|
|
// FIXME: MCize.
|
|
Asm->O << SecOffDir << Label->getName();
|
|
Asm->OutStreamer.AddBlankLine();
|
|
} else {
|
|
unsigned Size = IsSmall ? 4 : TD->getPointerSize();
|
|
Asm->OutStreamer.EmitSymbolValue(Label, Size, 0/*AddrSpace*/);
|
|
}
|
|
}
|
|
|
|
/// EmitFrameMoves - Emit frame instructions to describe the layout of the
|
|
/// frame.
|
|
void DwarfPrinter::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();
|
|
|
|
// Throw out move if the label is invalid.
|
|
if (LabelID && MMI->isLabelDeleted(LabelID))
|
|
continue;
|
|
|
|
const MachineLocation &Dst = Move.getDestination();
|
|
const MachineLocation &Src = Move.getSource();
|
|
|
|
// Advance row if new location.
|
|
if (BaseLabel && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
|
|
EmitCFAByte(dwarf::DW_CFA_advance_loc4);
|
|
EmitDifference(getDWLabel("label", LabelID),
|
|
getDWLabel(BaseLabel, BaseLabelID), true);
|
|
BaseLabelID = LabelID;
|
|
BaseLabel = "label";
|
|
IsLocal = true;
|
|
}
|
|
|
|
// If advancing cfa.
|
|
if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
|
|
if (!Src.isReg()) {
|
|
if (Src.getReg() == MachineLocation::VirtualFP) {
|
|
EmitCFAByte(dwarf::DW_CFA_def_cfa_offset);
|
|
} else {
|
|
EmitCFAByte(dwarf::DW_CFA_def_cfa);
|
|
EmitULEB128(RI->getDwarfRegNum(Src.getReg(), isEH), "Register");
|
|
}
|
|
|
|
int Offset = -Src.getOffset();
|
|
EmitULEB128(Offset, "Offset");
|
|
} else {
|
|
llvm_unreachable("Machine move not supported yet.");
|
|
}
|
|
} else if (Src.isReg() &&
|
|
Src.getReg() == MachineLocation::VirtualFP) {
|
|
if (Dst.isReg()) {
|
|
EmitCFAByte(dwarf::DW_CFA_def_cfa_register);
|
|
EmitULEB128(RI->getDwarfRegNum(Dst.getReg(), isEH), "Register");
|
|
} else {
|
|
llvm_unreachable("Machine move not supported yet.");
|
|
}
|
|
} else {
|
|
unsigned Reg = RI->getDwarfRegNum(Src.getReg(), isEH);
|
|
int Offset = Dst.getOffset() / stackGrowth;
|
|
|
|
if (Offset < 0) {
|
|
EmitCFAByte(dwarf::DW_CFA_offset_extended_sf);
|
|
EmitULEB128(Reg, "Reg");
|
|
EmitSLEB128(Offset, "Offset");
|
|
} else if (Reg < 64) {
|
|
EmitCFAByte(dwarf::DW_CFA_offset + Reg);
|
|
EmitULEB128(Offset, "Offset");
|
|
} else {
|
|
EmitCFAByte(dwarf::DW_CFA_offset_extended);
|
|
EmitULEB128(Reg, "Reg");
|
|
EmitULEB128(Offset, "Offset");
|
|
}
|
|
}
|
|
}
|
|
}
|