#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmBackend.h"
using namespace llvm;
#define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE)
#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255)
#define DWARF2_LINE_OPCODE_BASE 13
#define DWARF2_LINE_BASE -5
# define DWARF2_LINE_RANGE 14
# define DWARF2_LINE_MIN_INSN_LENGTH 1
static inline uint64_t ScaleAddrDelta(uint64_t AddrDelta)
{
if (DWARF2_LINE_MIN_INSN_LENGTH == 1)
return AddrDelta;
if (AddrDelta % DWARF2_LINE_MIN_INSN_LENGTH != 0) {
;
}
return AddrDelta / DWARF2_LINE_MIN_INSN_LENGTH;
}
void MCLineEntry::Make(MCObjectStreamer *MCOS, const MCSection *Section) {
if (!MCOS->getContext().getDwarfLocSeen())
return;
MCSymbol *LineSym = MCOS->getContext().CreateTempSymbol();
MCOS->EmitLabel(LineSym);
const MCDwarfLoc &DwarfLoc = MCOS->getContext().getCurrentDwarfLoc();
MCLineEntry LineEntry(LineSym, DwarfLoc);
MCOS->getContext().ClearDwarfLocSeen();
DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
MCOS->getContext().getMCLineSections();
MCLineSection *LineSection = MCLineSections[Section];
if (!LineSection) {
LineSection = new MCLineSection;
MCLineSections[Section] = LineSection;
}
LineSection->addLineEntry(LineEntry);
}
static inline const MCExpr *MakeStartMinusEndExpr(MCObjectStreamer *MCOS,
MCSymbol *Start,
MCSymbol *End, int IntVal) {
MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
const MCExpr *Res =
MCSymbolRefExpr::Create(End, Variant, MCOS->getContext());
const MCExpr *RHS =
MCSymbolRefExpr::Create(Start, Variant, MCOS->getContext());
const MCExpr *Res1 =
MCBinaryExpr::Create(MCBinaryExpr::Sub, Res, RHS, MCOS->getContext());
const MCExpr *Res2 =
MCConstantExpr::Create(IntVal, MCOS->getContext());
const MCExpr *Res3 =
MCBinaryExpr::Create(MCBinaryExpr::Sub, Res1, Res2, MCOS->getContext());
return Res3;
}
static inline void EmitDwarfSetAddress(MCObjectStreamer *MCOS,
MCSymbol *Symbol) {
MCOS->EmitIntValue(dwarf::DW_LNS_extended_op, 1);
int sizeof_address = MCOS->getAssembler().getBackend().getPointerSize();
MCOS->EmitULEB128Value(sizeof_address + 1);
MCOS->EmitIntValue(dwarf::DW_LNE_set_address, 1);
MCOS->EmitSymbolValue(Symbol, sizeof_address);
}
static inline bool EmitDwarfLineTable(MCObjectStreamer *MCOS,
const MCSection *Section,
MCLineSection *LineSection,
const MCSection *DwarfLineSection) {
unsigned FileNum = 1;
unsigned LastLine = 1;
unsigned Column = 0;
unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
unsigned Isa = 0;
bool EmittedLineTable = false;
MCSymbol *LastLabel = NULL;
MCSectionData &DLS =
MCOS->getAssembler().getOrCreateSectionData(*DwarfLineSection);
for (MCLineSection::iterator
it = LineSection->getMCLineEntries()->begin(),
ie = LineSection->getMCLineEntries()->end(); it != ie; ++it) {
if (FileNum != it->getFileNum()) {
FileNum = it->getFileNum();
MCOS->EmitIntValue(dwarf::DW_LNS_set_file, 1);
MCOS->EmitULEB128Value(FileNum);
}
if (Column != it->getColumn()) {
Column = it->getColumn();
MCOS->EmitIntValue(dwarf::DW_LNS_set_column, 1);
MCOS->EmitULEB128Value(Column);
}
if (Isa != it->getIsa()) {
Isa = it->getIsa();
MCOS->EmitIntValue(dwarf::DW_LNS_set_isa, 1);
MCOS->EmitULEB128Value(Isa);
}
if ((it->getFlags() ^ Flags) & DWARF2_FLAG_IS_STMT) {
Flags = it->getFlags();
MCOS->EmitIntValue(dwarf::DW_LNS_negate_stmt, 1);
}
if (it->getFlags() & DWARF2_FLAG_BASIC_BLOCK)
MCOS->EmitIntValue(dwarf::DW_LNS_set_basic_block, 1);
if (it->getFlags() & DWARF2_FLAG_PROLOGUE_END)
MCOS->EmitIntValue(dwarf::DW_LNS_set_prologue_end, 1);
if (it->getFlags() & DWARF2_FLAG_EPILOGUE_BEGIN)
MCOS->EmitIntValue(dwarf::DW_LNS_set_epilogue_begin, 1);
int64_t LineDelta = it->getLine() - LastLine;
MCSymbol *Label = it->getLabel();
if (LastLabel == NULL) {
EmitDwarfSetAddress(MCOS, Label);
MCDwarfLineAddr::Emit(MCOS, LineDelta, 0);
}
else {
const MCExpr *AddrDelta = MakeStartMinusEndExpr(MCOS, LastLabel, Label,0);
new MCDwarfLineAddrFragment(LineDelta, *AddrDelta, &DLS);
}
LastLine = it->getLine();
LastLabel = Label;
EmittedLineTable = true;
}
MCOS->SwitchSection(Section);
MCSymbol *SectionEnd = MCOS->getContext().CreateTempSymbol();
MCOS->EmitLabel(SectionEnd);
MCOS->SwitchSection(DwarfLineSection);
const MCExpr *AddrDelta = MakeStartMinusEndExpr(MCOS, LastLabel, SectionEnd,
0);
new MCDwarfLineAddrFragment(INT64_MAX, *AddrDelta, &DLS);
return EmittedLineTable;
}
void MCDwarfFileTable::Emit(MCObjectStreamer *MCOS,
const MCSection *DwarfLineSection) {
MCOS->SwitchSection(DwarfLineSection);
MCSymbol *LineStartSym = MCOS->getContext().CreateTempSymbol();
MCOS->EmitLabel(LineStartSym);
MCSymbol *LineEndSym = MCOS->getContext().CreateTempSymbol();
MCOS->EmitValue(MakeStartMinusEndExpr(MCOS, LineStartSym, LineEndSym, 4),
4, 0);
MCOS->EmitIntValue(2, 2);
MCSymbol *ProEndSym = MCOS->getContext().CreateTempSymbol();
MCOS->EmitValue(MakeStartMinusEndExpr(MCOS, LineStartSym, ProEndSym,
(4 + 2 + 4)),
4, 0);
MCOS->EmitIntValue(DWARF2_LINE_MIN_INSN_LENGTH, 1);
MCOS->EmitIntValue(DWARF2_LINE_DEFAULT_IS_STMT, 1);
MCOS->EmitIntValue(DWARF2_LINE_BASE, 1);
MCOS->EmitIntValue(DWARF2_LINE_RANGE, 1);
MCOS->EmitIntValue(DWARF2_LINE_OPCODE_BASE, 1);
MCOS->EmitIntValue(0, 1); MCOS->EmitIntValue(1, 1); MCOS->EmitIntValue(1, 1); MCOS->EmitIntValue(1, 1); MCOS->EmitIntValue(1, 1); MCOS->EmitIntValue(0, 1); MCOS->EmitIntValue(0, 1); MCOS->EmitIntValue(0, 1); MCOS->EmitIntValue(1, 1); MCOS->EmitIntValue(0, 1); MCOS->EmitIntValue(0, 1); MCOS->EmitIntValue(1, 1);
const std::vector<StringRef> &MCDwarfDirs =
MCOS->getContext().getMCDwarfDirs();
for (unsigned i = 0; i < MCDwarfDirs.size(); i++) {
MCOS->EmitBytes(MCDwarfDirs[i], 0); MCOS->EmitBytes(StringRef("\0", 1), 0); }
MCOS->EmitIntValue(0, 1);
const std::vector<MCDwarfFile *> &MCDwarfFiles =
MCOS->getContext().getMCDwarfFiles();
for (unsigned i = 1; i < MCDwarfFiles.size(); i++) {
MCOS->EmitBytes(MCDwarfFiles[i]->getName(), 0); MCOS->EmitBytes(StringRef("\0", 1), 0); MCOS->EmitULEB128Value(MCDwarfFiles[i]->getDirIndex()); MCOS->EmitIntValue(0, 1); MCOS->EmitIntValue(0, 1); }
MCOS->EmitIntValue(0, 1);
MCOS->EmitLabel(ProEndSym);
bool EmittedLineTable = false;
DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
MCOS->getContext().getMCLineSections();
for (DenseMap<const MCSection *, MCLineSection *>::iterator it =
MCLineSections.begin(), ie = MCLineSections.end(); it != ie; ++it) {
EmittedLineTable = EmitDwarfLineTable(MCOS, it->first, it->second,
DwarfLineSection);
delete it->second;
}
if (EmittedLineTable == false) {
if (MCOS->getAssembler().getBackend().getPointerSize() == 8) {
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(9, 1);
MCOS->EmitIntValue(2, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
}
else {
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(5, 1);
MCOS->EmitIntValue(2, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
}
MCOS->EmitIntValue(0, 1); MCOS->EmitIntValue(1, 1); MCOS->EmitIntValue(1, 1); }
MCOS->EmitLabel(LineEndSym);
}
uint64_t MCDwarfLineAddr::ComputeSize(int64_t LineDelta, uint64_t AddrDelta) {
SmallString<256> Tmp;
raw_svector_ostream OS(Tmp);
MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OS);
return OS.GetNumBytesInBuffer();
}
void MCDwarfLineAddr::Write(MCObjectWriter *OW, int64_t LineDelta,
uint64_t AddrDelta) {
SmallString<256> Tmp;
raw_svector_ostream OS(Tmp);
MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OS);
OW->WriteBytes(OS.str());
}
void MCDwarfLineAddr::Emit(MCObjectStreamer *MCOS, int64_t LineDelta,
uint64_t AddrDelta) {
SmallString<256> Tmp;
raw_svector_ostream OS(Tmp);
MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OS);
MCOS->EmitBytes(OS.str(), 0);
}
void MCDwarfLineAddr::Encode(int64_t LineDelta, uint64_t AddrDelta,
raw_ostream &OS) {
uint64_t Temp, Opcode;
bool NeedCopy = false;
AddrDelta = ScaleAddrDelta(AddrDelta);
if (LineDelta == INT64_MAX) {
if (AddrDelta == MAX_SPECIAL_ADDR_DELTA)
OS << char(dwarf::DW_LNS_const_add_pc);
else {
OS << char(dwarf::DW_LNS_advance_pc);
SmallString<32> Tmp;
raw_svector_ostream OSE(Tmp);
MCObjectWriter::EncodeULEB128(AddrDelta, OSE);
OS << OSE.str();
}
OS << char(dwarf::DW_LNS_extended_op);
OS << char(1);
OS << char(dwarf::DW_LNE_end_sequence);
return;
}
Temp = LineDelta - DWARF2_LINE_BASE;
if (Temp >= DWARF2_LINE_RANGE) {
OS << char(dwarf::DW_LNS_advance_line);
SmallString<32> Tmp;
raw_svector_ostream OSE(Tmp);
MCObjectWriter::EncodeSLEB128(LineDelta, OSE);
OS << OSE.str();
LineDelta = 0;
Temp = 0 - DWARF2_LINE_BASE;
NeedCopy = true;
}
if (LineDelta == 0 && AddrDelta == 0) {
OS << char(dwarf::DW_LNS_copy);
return;
}
Temp += DWARF2_LINE_OPCODE_BASE;
if (AddrDelta < 256 + MAX_SPECIAL_ADDR_DELTA) {
Opcode = Temp + AddrDelta * DWARF2_LINE_RANGE;
if (Opcode <= 255) {
OS << char(Opcode);
return;
}
Opcode = Temp + (AddrDelta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE;
if (Opcode <= 255) {
OS << char(dwarf::DW_LNS_const_add_pc);
OS << char(Opcode);
return;
}
}
OS << char(dwarf::DW_LNS_advance_pc);
SmallString<32> Tmp;
raw_svector_ostream OSE(Tmp);
MCObjectWriter::EncodeULEB128(AddrDelta, OSE);
OS << OSE.str();
if (NeedCopy)
OS << char(dwarf::DW_LNS_copy);
else
OS << char(Temp);
}
void MCDwarfFile::print(raw_ostream &OS) const {
OS << '"' << getName() << '"';
}
void MCDwarfFile::dump() const {
print(dbgs());
}