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-rw-r--r--lib/MC/MCDwarf.cpp210
1 files changed, 12 insertions, 198 deletions
diff --git a/lib/MC/MCDwarf.cpp b/lib/MC/MCDwarf.cpp
index c1de31b..d7540ce 100644
--- a/lib/MC/MCDwarf.cpp
+++ b/lib/MC/MCDwarf.cpp
@@ -19,7 +19,6 @@
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmBackend.h"
-#include "llvm/Target/TargetAsmInfo.h"
using namespace llvm;
// Given a special op, return the address skip amount (in units of
@@ -126,7 +125,8 @@ static inline const MCExpr *MakeStartMinusEndExpr(const MCStreamer &MCOS,
//
static inline void EmitDwarfLineTable(MCStreamer *MCOS,
const MCSection *Section,
- const MCLineSection *LineSection) {
+ const MCLineSection *LineSection,
+ const MCSection *DwarfLineSection) {
unsigned FileNum = 1;
unsigned LastLine = 1;
unsigned Column = 0;
@@ -185,15 +185,13 @@ static inline void EmitDwarfLineTable(MCStreamer *MCOS,
// Switch to the section to be able to create a symbol at its end.
MCOS->SwitchSection(Section);
-
- MCContext &context = MCOS->getContext();
// Create a symbol at the end of the section.
- MCSymbol *SectionEnd = context.CreateTempSymbol();
+ MCSymbol *SectionEnd = MCOS->getContext().CreateTempSymbol();
// Set the value of the symbol, as we are at the end of the section.
MCOS->EmitLabel(SectionEnd);
// Switch back the the dwarf line section.
- MCOS->SwitchSection(context.getTargetAsmInfo().getDwarfLineSection());
+ MCOS->SwitchSection(DwarfLineSection);
MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, SectionEnd);
}
@@ -201,18 +199,18 @@ static inline void EmitDwarfLineTable(MCStreamer *MCOS,
//
// This emits the Dwarf file and the line tables.
//
-void MCDwarfFileTable::Emit(MCStreamer *MCOS) {
- MCContext &context = MCOS->getContext();
+void MCDwarfFileTable::Emit(MCStreamer *MCOS,
+ const MCSection *DwarfLineSection) {
// Switch to the section where the table will be emitted into.
- MCOS->SwitchSection(context.getTargetAsmInfo().getDwarfLineSection());
+ MCOS->SwitchSection(DwarfLineSection);
// Create a symbol at the beginning of this section.
- MCSymbol *LineStartSym = context.CreateTempSymbol();
+ MCSymbol *LineStartSym = MCOS->getContext().CreateTempSymbol();
// Set the value of the symbol, as we are at the start of the section.
MCOS->EmitLabel(LineStartSym);
// Create a symbol for the end of the section (to be set when we get there).
- MCSymbol *LineEndSym = context.CreateTempSymbol();
+ MCSymbol *LineEndSym = MCOS->getContext().CreateTempSymbol();
// The first 4 bytes is the total length of the information for this
// compilation unit (not including these 4 bytes for the length).
@@ -223,7 +221,7 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS) {
MCOS->EmitIntValue(2, 2);
// Create a symbol for the end of the prologue (to be set when we get there).
- MCSymbol *ProEndSym = context.CreateTempSymbol(); // Lprologue_end
+ MCSymbol *ProEndSym = MCOS->getContext().CreateTempSymbol(); // Lprologue_end
// Length of the prologue, is the next 4 bytes. Which is the start of the
// section to the end of the prologue. Not including the 4 bytes for the
@@ -258,7 +256,7 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS) {
// First the directory table.
const std::vector<StringRef> &MCDwarfDirs =
- context.getMCDwarfDirs();
+ MCOS->getContext().getMCDwarfDirs();
for (unsigned i = 0; i < MCDwarfDirs.size(); i++) {
MCOS->EmitBytes(MCDwarfDirs[i], 0); // the DirectoryName
MCOS->EmitBytes(StringRef("\0", 1), 0); // the null term. of the string
@@ -292,7 +290,7 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS) {
++it) {
const MCSection *Sec = *it;
const MCLineSection *Line = MCLineSections.lookup(Sec);
- EmitDwarfLineTable(MCOS, Sec, Line);
+ EmitDwarfLineTable(MCOS, Sec, Line, DwarfLineSection);
// Now delete the MCLineSections that were created in MCLineEntry::Make()
// and used to emit the line table.
@@ -427,187 +425,3 @@ void MCDwarfFile::dump() const {
print(dbgs());
}
-static int getDataAlignmentFactor(MCStreamer &streamer) {
- MCContext &context = streamer.getContext();
- const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
- int size = asmInfo.getPointerSize();
- if (asmInfo.getStackGrowthDirection() == TargetFrameInfo::StackGrowsUp)
- return size;
- else
- return -size;
-}
-
-/// EmitFrameMoves - Emit frame instructions to describe the layout of the
-/// frame.
-static void EmitFrameMoves(MCStreamer &streamer,
- const std::vector<MachineMove> &Moves,
- MCSymbol *BaseLabel, bool isEH) {
- MCContext &context = streamer.getContext();
- const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
- int dataAlignmentFactor = getDataAlignmentFactor(streamer);
-
- for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
- const MachineMove &Move = Moves[i];
- MCSymbol *Label = Move.getLabel();
- // Throw out move if the label is invalid.
- if (Label && !Label->isDefined()) continue; // Not emitted, in dead code.
-
- const MachineLocation &Dst = Move.getDestination();
- const MachineLocation &Src = Move.getSource();
-
- // Advance row if new location.
- if (BaseLabel && Label) {
- MCSymbol *ThisSym = Label;
- if (ThisSym != BaseLabel) {
- streamer.EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
- const MCExpr *Length = MakeStartMinusEndExpr(streamer, *BaseLabel,
- *ThisSym, 4);
- streamer.EmitValue(Length, 4);
- BaseLabel = ThisSym;
- }
- }
-
- // If advancing cfa.
- if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
- assert(!Src.isReg() && "Machine move not supported yet.");
-
- if (Src.getReg() == MachineLocation::VirtualFP) {
- streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1);
- } else {
- streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1);
- streamer.EmitULEB128IntValue(asmInfo.getDwarfRegNum(Src.getReg(), isEH),
- 1);
- }
-
- streamer.EmitULEB128IntValue(-Src.getOffset(), 1);
- continue;
- }
-
- if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) {
- assert(Dst.isReg() && "Machine move not supported yet.");
- streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1);
- streamer.EmitULEB128IntValue(asmInfo.getDwarfRegNum(Dst.getReg(), isEH));
- continue;
- }
-
- unsigned Reg = asmInfo.getDwarfRegNum(Src.getReg(), isEH);
- int Offset = Dst.getOffset() / dataAlignmentFactor;
-
- if (Offset < 0) {
- streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1);
- streamer.EmitULEB128IntValue(Reg);
- streamer.EmitSLEB128IntValue(Offset);
- } else if (Reg < 64) {
- streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1);
- streamer.EmitULEB128IntValue(Offset, 1);
- } else {
- streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1);
- streamer.EmitULEB128IntValue(Reg, 1);
- streamer.EmitULEB128IntValue(Offset, 1);
- }
- }
-}
-
-static const MCSymbol &EmitCIE(MCStreamer &streamer) {
- MCContext &context = streamer.getContext();
- const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
- const MCSection &section = *asmInfo.getEHFrameSection();
- streamer.SwitchSection(&section);
- MCSymbol *sectionStart = streamer.getContext().CreateTempSymbol();
- MCSymbol *sectionEnd = streamer.getContext().CreateTempSymbol();
-
- // Length
- const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart,
- *sectionEnd, 4);
- streamer.EmitLabel(sectionStart);
- streamer.EmitValue(Length, 4);
-
- // CIE ID
- streamer.EmitIntValue(0, 4);
-
- // Version
- streamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1);
-
- // Augmentation String
- SmallString<8> Augmentation;
- Augmentation += "zR";
- streamer.EmitBytes(Augmentation.str(), 0);
- streamer.EmitIntValue(0, 1);
-
- // Code Alignment Factor
- streamer.EmitULEB128IntValue(1);
-
- // Data Alignment Factor
- streamer.EmitSLEB128IntValue(getDataAlignmentFactor(streamer));
-
- // Return Address Register
- streamer.EmitULEB128IntValue(asmInfo.getDwarfRARegNum(true));
-
- // Augmentation Data Length (optional)
- MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol();
- MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol();
- const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer,
- *augmentationStart,
- *augmentationEnd, 0);
- streamer.EmitULEB128Value(augmentationLength);
-
- // Augmentation Data (optional)
- streamer.EmitLabel(augmentationStart);
- streamer.EmitIntValue(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4, 1);
- streamer.EmitLabel(augmentationEnd);
-
- // Initial Instructions
-
- const std::vector<MachineMove> Moves = asmInfo.getInitialFrameState();
-
- EmitFrameMoves(streamer, Moves, NULL, true);
-
- // Padding
- streamer.EmitValueToAlignment(asmInfo.getPointerSize());
-
- streamer.EmitLabel(sectionEnd);
- return *sectionStart;
-}
-
-static void EmitFDE(MCStreamer &streamer,
- const MCSymbol &cieStart,
- const MCDwarfFrameInfo &frame) {
- MCContext &context = streamer.getContext();
- const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
- MCSymbol *fdeStart = streamer.getContext().CreateTempSymbol();
- MCSymbol *fdeEnd = streamer.getContext().CreateTempSymbol();
-
- // Length
- const MCExpr *Length = MakeStartMinusEndExpr(streamer, *fdeStart, *fdeEnd, 0);
- streamer.EmitValue(Length, 4);
-
- streamer.EmitLabel(fdeStart);
- // CIE Pointer
- const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart,
- 0);
- streamer.EmitValue(offset, 4);
-
- // PC Begin
- streamer.EmitPCRelSymbolValue(frame.Begin, 4);
-
- // PC Range
- const MCExpr *Range = MakeStartMinusEndExpr(streamer, *frame.Begin,
- *frame.End, 0);
- streamer.EmitValue(Range, 4);
-
- // Augmentation Data Length
- streamer.EmitULEB128IntValue(0);
-
- // Augmentation Data
- // Call Frame Instructions
-
- // Padding
- streamer.EmitValueToAlignment(asmInfo.getPointerSize());
- streamer.EmitLabel(fdeEnd);
-}
-
-void MCDwarfFrameEmitter::Emit(MCStreamer &streamer) {
- const MCSymbol &cieStart = EmitCIE(streamer);
- for (unsigned i = 0, n = streamer.getNumFrameInfos(); i < n; ++i)
- EmitFDE(streamer, cieStart, streamer.getFrameInfo(i));
-}
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