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https://github.com/RPCS3/llvm-mirror.git
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f76590b3c5
This still seems to be causing some failures. It needs more testing before it gets enabled again. llvm-svn: 144543
1088 lines
40 KiB
C++
1088 lines
40 KiB
C++
//===- lib/MC/MCDwarf.cpp - MCDwarf implementation ------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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using namespace llvm;
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// Given a special op, return the address skip amount (in units of
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// DWARF2_LINE_MIN_INSN_LENGTH.
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#define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE)
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// The maximum address skip amount that can be encoded with a special op.
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#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255)
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// First special line opcode - leave room for the standard opcodes.
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// Note: If you want to change this, you'll have to update the
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// "standard_opcode_lengths" table that is emitted in DwarfFileTable::Emit().
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#define DWARF2_LINE_OPCODE_BASE 13
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// Minimum line offset in a special line info. opcode. This value
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// was chosen to give a reasonable range of values.
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#define DWARF2_LINE_BASE -5
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// Range of line offsets in a special line info. opcode.
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#define DWARF2_LINE_RANGE 14
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// Define the architecture-dependent minimum instruction length (in bytes).
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// This value should be rather too small than too big.
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#define DWARF2_LINE_MIN_INSN_LENGTH 1
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// Note: when DWARF2_LINE_MIN_INSN_LENGTH == 1 which is the current setting,
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// this routine is a nop and will be optimized away.
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static inline uint64_t ScaleAddrDelta(uint64_t AddrDelta) {
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if (DWARF2_LINE_MIN_INSN_LENGTH == 1)
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return AddrDelta;
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if (AddrDelta % DWARF2_LINE_MIN_INSN_LENGTH != 0) {
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// TODO: report this error, but really only once.
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;
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}
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return AddrDelta / DWARF2_LINE_MIN_INSN_LENGTH;
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}
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//
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// This is called when an instruction is assembled into the specified section
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// and if there is information from the last .loc directive that has yet to have
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// a line entry made for it is made.
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//
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void MCLineEntry::Make(MCStreamer *MCOS, const MCSection *Section) {
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if (!MCOS->getContext().getDwarfLocSeen())
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return;
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// Create a symbol at in the current section for use in the line entry.
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MCSymbol *LineSym = MCOS->getContext().CreateTempSymbol();
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// Set the value of the symbol to use for the MCLineEntry.
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MCOS->EmitLabel(LineSym);
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// Get the current .loc info saved in the context.
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const MCDwarfLoc &DwarfLoc = MCOS->getContext().getCurrentDwarfLoc();
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// Create a (local) line entry with the symbol and the current .loc info.
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MCLineEntry LineEntry(LineSym, DwarfLoc);
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// clear DwarfLocSeen saying the current .loc info is now used.
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MCOS->getContext().ClearDwarfLocSeen();
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// Get the MCLineSection for this section, if one does not exist for this
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// section create it.
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const DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
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MCOS->getContext().getMCLineSections();
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MCLineSection *LineSection = MCLineSections.lookup(Section);
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if (!LineSection) {
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// Create a new MCLineSection. This will be deleted after the dwarf line
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// table is created using it by iterating through the MCLineSections
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// DenseMap.
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LineSection = new MCLineSection;
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// Save a pointer to the new LineSection into the MCLineSections DenseMap.
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MCOS->getContext().addMCLineSection(Section, LineSection);
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}
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// Add the line entry to this section's entries.
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LineSection->addLineEntry(LineEntry);
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}
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//
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// This helper routine returns an expression of End - Start + IntVal .
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//
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static inline const MCExpr *MakeStartMinusEndExpr(const MCStreamer &MCOS,
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const MCSymbol &Start,
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const MCSymbol &End,
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int IntVal) {
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MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
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const MCExpr *Res =
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MCSymbolRefExpr::Create(&End, Variant, MCOS.getContext());
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const MCExpr *RHS =
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MCSymbolRefExpr::Create(&Start, Variant, MCOS.getContext());
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const MCExpr *Res1 =
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MCBinaryExpr::Create(MCBinaryExpr::Sub, Res, RHS, MCOS.getContext());
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const MCExpr *Res2 =
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MCConstantExpr::Create(IntVal, MCOS.getContext());
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const MCExpr *Res3 =
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MCBinaryExpr::Create(MCBinaryExpr::Sub, Res1, Res2, MCOS.getContext());
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return Res3;
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}
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//
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// This emits the Dwarf line table for the specified section from the entries
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// in the LineSection.
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//
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static inline void EmitDwarfLineTable(MCStreamer *MCOS,
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const MCSection *Section,
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const MCLineSection *LineSection) {
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unsigned FileNum = 1;
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unsigned LastLine = 1;
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unsigned Column = 0;
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unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
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unsigned Isa = 0;
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MCSymbol *LastLabel = NULL;
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// Loop through each MCLineEntry and encode the dwarf line number table.
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for (MCLineSection::const_iterator
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it = LineSection->getMCLineEntries()->begin(),
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ie = LineSection->getMCLineEntries()->end(); it != ie; ++it) {
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if (FileNum != it->getFileNum()) {
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FileNum = it->getFileNum();
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MCOS->EmitIntValue(dwarf::DW_LNS_set_file, 1);
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MCOS->EmitULEB128IntValue(FileNum);
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}
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if (Column != it->getColumn()) {
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Column = it->getColumn();
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MCOS->EmitIntValue(dwarf::DW_LNS_set_column, 1);
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MCOS->EmitULEB128IntValue(Column);
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}
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if (Isa != it->getIsa()) {
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Isa = it->getIsa();
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MCOS->EmitIntValue(dwarf::DW_LNS_set_isa, 1);
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MCOS->EmitULEB128IntValue(Isa);
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}
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if ((it->getFlags() ^ Flags) & DWARF2_FLAG_IS_STMT) {
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Flags = it->getFlags();
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MCOS->EmitIntValue(dwarf::DW_LNS_negate_stmt, 1);
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}
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if (it->getFlags() & DWARF2_FLAG_BASIC_BLOCK)
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MCOS->EmitIntValue(dwarf::DW_LNS_set_basic_block, 1);
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if (it->getFlags() & DWARF2_FLAG_PROLOGUE_END)
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MCOS->EmitIntValue(dwarf::DW_LNS_set_prologue_end, 1);
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if (it->getFlags() & DWARF2_FLAG_EPILOGUE_BEGIN)
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MCOS->EmitIntValue(dwarf::DW_LNS_set_epilogue_begin, 1);
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int64_t LineDelta = static_cast<int64_t>(it->getLine()) - LastLine;
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MCSymbol *Label = it->getLabel();
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// At this point we want to emit/create the sequence to encode the delta in
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// line numbers and the increment of the address from the previous Label
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// and the current Label.
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const MCAsmInfo &asmInfo = MCOS->getContext().getAsmInfo();
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MCOS->EmitDwarfAdvanceLineAddr(LineDelta, LastLabel, Label,
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asmInfo.getPointerSize());
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LastLine = it->getLine();
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LastLabel = Label;
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}
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// Emit a DW_LNE_end_sequence for the end of the section.
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// Using the pointer Section create a temporary label at the end of the
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// section and use that and the LastLabel to compute the address delta
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// and use INT64_MAX as the line delta which is the signal that this is
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// actually a DW_LNE_end_sequence.
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// Switch to the section to be able to create a symbol at its end.
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MCOS->SwitchSection(Section);
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MCContext &context = MCOS->getContext();
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// Create a symbol at the end of the section.
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MCSymbol *SectionEnd = context.CreateTempSymbol();
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// Set the value of the symbol, as we are at the end of the section.
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MCOS->EmitLabel(SectionEnd);
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// Switch back the the dwarf line section.
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MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfLineSection());
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const MCAsmInfo &asmInfo = MCOS->getContext().getAsmInfo();
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MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, SectionEnd,
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asmInfo.getPointerSize());
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}
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//
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// This emits the Dwarf file and the line tables.
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//
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void MCDwarfFileTable::Emit(MCStreamer *MCOS) {
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MCContext &context = MCOS->getContext();
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// Switch to the section where the table will be emitted into.
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MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfLineSection());
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// Create a symbol at the beginning of this section.
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MCSymbol *LineStartSym = context.CreateTempSymbol();
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// Set the value of the symbol, as we are at the start of the section.
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MCOS->EmitLabel(LineStartSym);
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// Create a symbol for the end of the section (to be set when we get there).
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MCSymbol *LineEndSym = context.CreateTempSymbol();
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// The first 4 bytes is the total length of the information for this
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// compilation unit (not including these 4 bytes for the length).
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MCOS->EmitAbsValue(MakeStartMinusEndExpr(*MCOS, *LineStartSym, *LineEndSym,4),
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4);
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// Next 2 bytes is the Version, which is Dwarf 2.
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MCOS->EmitIntValue(2, 2);
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// Create a symbol for the end of the prologue (to be set when we get there).
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MCSymbol *ProEndSym = context.CreateTempSymbol(); // Lprologue_end
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// Length of the prologue, is the next 4 bytes. Which is the start of the
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// section to the end of the prologue. Not including the 4 bytes for the
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// total length, the 2 bytes for the version, and these 4 bytes for the
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// length of the prologue.
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MCOS->EmitAbsValue(MakeStartMinusEndExpr(*MCOS, *LineStartSym, *ProEndSym,
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(4 + 2 + 4)),
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4, 0);
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// Parameters of the state machine, are next.
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MCOS->EmitIntValue(DWARF2_LINE_MIN_INSN_LENGTH, 1);
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MCOS->EmitIntValue(DWARF2_LINE_DEFAULT_IS_STMT, 1);
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MCOS->EmitIntValue(DWARF2_LINE_BASE, 1);
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MCOS->EmitIntValue(DWARF2_LINE_RANGE, 1);
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MCOS->EmitIntValue(DWARF2_LINE_OPCODE_BASE, 1);
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// Standard opcode lengths
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MCOS->EmitIntValue(0, 1); // length of DW_LNS_copy
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MCOS->EmitIntValue(1, 1); // length of DW_LNS_advance_pc
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MCOS->EmitIntValue(1, 1); // length of DW_LNS_advance_line
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MCOS->EmitIntValue(1, 1); // length of DW_LNS_set_file
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MCOS->EmitIntValue(1, 1); // length of DW_LNS_set_column
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MCOS->EmitIntValue(0, 1); // length of DW_LNS_negate_stmt
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MCOS->EmitIntValue(0, 1); // length of DW_LNS_set_basic_block
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MCOS->EmitIntValue(0, 1); // length of DW_LNS_const_add_pc
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MCOS->EmitIntValue(1, 1); // length of DW_LNS_fixed_advance_pc
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MCOS->EmitIntValue(0, 1); // length of DW_LNS_set_prologue_end
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MCOS->EmitIntValue(0, 1); // length of DW_LNS_set_epilogue_begin
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MCOS->EmitIntValue(1, 1); // DW_LNS_set_isa
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// Put out the directory and file tables.
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// First the directory table.
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const std::vector<StringRef> &MCDwarfDirs =
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context.getMCDwarfDirs();
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for (unsigned i = 0; i < MCDwarfDirs.size(); i++) {
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MCOS->EmitBytes(MCDwarfDirs[i], 0); // the DirectoryName
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MCOS->EmitBytes(StringRef("\0", 1), 0); // the null term. of the string
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}
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MCOS->EmitIntValue(0, 1); // Terminate the directory list
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// Second the file table.
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const std::vector<MCDwarfFile *> &MCDwarfFiles =
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MCOS->getContext().getMCDwarfFiles();
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for (unsigned i = 1; i < MCDwarfFiles.size(); i++) {
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MCOS->EmitBytes(MCDwarfFiles[i]->getName(), 0); // FileName
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MCOS->EmitBytes(StringRef("\0", 1), 0); // the null term. of the string
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// the Directory num
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MCOS->EmitULEB128IntValue(MCDwarfFiles[i]->getDirIndex());
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MCOS->EmitIntValue(0, 1); // last modification timestamp (always 0)
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MCOS->EmitIntValue(0, 1); // filesize (always 0)
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}
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MCOS->EmitIntValue(0, 1); // Terminate the file list
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// This is the end of the prologue, so set the value of the symbol at the
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// end of the prologue (that was used in a previous expression).
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MCOS->EmitLabel(ProEndSym);
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// Put out the line tables.
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const DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
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MCOS->getContext().getMCLineSections();
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const std::vector<const MCSection *> &MCLineSectionOrder =
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MCOS->getContext().getMCLineSectionOrder();
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for (std::vector<const MCSection*>::const_iterator it =
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MCLineSectionOrder.begin(), ie = MCLineSectionOrder.end(); it != ie;
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++it) {
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const MCSection *Sec = *it;
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const MCLineSection *Line = MCLineSections.lookup(Sec);
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EmitDwarfLineTable(MCOS, Sec, Line);
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// Now delete the MCLineSections that were created in MCLineEntry::Make()
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// and used to emit the line table.
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delete Line;
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}
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if (MCOS->getContext().getAsmInfo().getLinkerRequiresNonEmptyDwarfLines()
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&& MCLineSectionOrder.begin() == MCLineSectionOrder.end()) {
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// The darwin9 linker has a bug (see PR8715). For for 32-bit architectures
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// it requires:
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// total_length >= prologue_length + 10
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// We are 4 bytes short, since we have total_length = 51 and
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// prologue_length = 45
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// The regular end_sequence should be sufficient.
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MCDwarfLineAddr::Emit(MCOS, INT64_MAX, 0);
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}
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// This is the end of the section, so set the value of the symbol at the end
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// of this section (that was used in a previous expression).
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MCOS->EmitLabel(LineEndSym);
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}
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/// Utility function to write the encoding to an object writer.
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void MCDwarfLineAddr::Write(MCObjectWriter *OW, int64_t LineDelta,
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uint64_t AddrDelta) {
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SmallString<256> Tmp;
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raw_svector_ostream OS(Tmp);
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MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OS);
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OW->WriteBytes(OS.str());
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}
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/// Utility function to emit the encoding to a streamer.
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void MCDwarfLineAddr::Emit(MCStreamer *MCOS, int64_t LineDelta,
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uint64_t AddrDelta) {
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SmallString<256> Tmp;
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raw_svector_ostream OS(Tmp);
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MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OS);
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MCOS->EmitBytes(OS.str(), /*AddrSpace=*/0);
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}
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/// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas.
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void MCDwarfLineAddr::Encode(int64_t LineDelta, uint64_t AddrDelta,
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raw_ostream &OS) {
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uint64_t Temp, Opcode;
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bool NeedCopy = false;
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// Scale the address delta by the minimum instruction length.
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AddrDelta = ScaleAddrDelta(AddrDelta);
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// A LineDelta of INT64_MAX is a signal that this is actually a
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// DW_LNE_end_sequence. We cannot use special opcodes here, since we want the
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// end_sequence to emit the matrix entry.
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if (LineDelta == INT64_MAX) {
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if (AddrDelta == MAX_SPECIAL_ADDR_DELTA)
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OS << char(dwarf::DW_LNS_const_add_pc);
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else {
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OS << char(dwarf::DW_LNS_advance_pc);
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MCObjectWriter::EncodeULEB128(AddrDelta, OS);
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}
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OS << char(dwarf::DW_LNS_extended_op);
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OS << char(1);
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OS << char(dwarf::DW_LNE_end_sequence);
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return;
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}
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// Bias the line delta by the base.
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Temp = LineDelta - DWARF2_LINE_BASE;
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// If the line increment is out of range of a special opcode, we must encode
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// it with DW_LNS_advance_line.
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if (Temp >= DWARF2_LINE_RANGE) {
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OS << char(dwarf::DW_LNS_advance_line);
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MCObjectWriter::EncodeSLEB128(LineDelta, OS);
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LineDelta = 0;
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Temp = 0 - DWARF2_LINE_BASE;
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NeedCopy = true;
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}
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// Use DW_LNS_copy instead of a "line +0, addr +0" special opcode.
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if (LineDelta == 0 && AddrDelta == 0) {
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OS << char(dwarf::DW_LNS_copy);
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return;
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}
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// Bias the opcode by the special opcode base.
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Temp += DWARF2_LINE_OPCODE_BASE;
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// Avoid overflow when addr_delta is large.
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if (AddrDelta < 256 + MAX_SPECIAL_ADDR_DELTA) {
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// Try using a special opcode.
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Opcode = Temp + AddrDelta * DWARF2_LINE_RANGE;
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if (Opcode <= 255) {
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OS << char(Opcode);
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return;
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}
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// Try using DW_LNS_const_add_pc followed by special op.
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Opcode = Temp + (AddrDelta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE;
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if (Opcode <= 255) {
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OS << char(dwarf::DW_LNS_const_add_pc);
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OS << char(Opcode);
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return;
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}
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}
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// Otherwise use DW_LNS_advance_pc.
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OS << char(dwarf::DW_LNS_advance_pc);
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MCObjectWriter::EncodeULEB128(AddrDelta, OS);
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if (NeedCopy)
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OS << char(dwarf::DW_LNS_copy);
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else
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OS << char(Temp);
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}
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void MCDwarfFile::print(raw_ostream &OS) const {
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OS << '"' << getName() << '"';
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}
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void MCDwarfFile::dump() const {
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print(dbgs());
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}
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static int getDataAlignmentFactor(MCStreamer &streamer) {
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MCContext &context = streamer.getContext();
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const MCAsmInfo &asmInfo = context.getAsmInfo();
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int size = asmInfo.getPointerSize();
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if (asmInfo.isStackGrowthDirectionUp())
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return size;
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else
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return -size;
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|
}
|
|
|
|
static unsigned getSizeForEncoding(MCStreamer &streamer,
|
|
unsigned symbolEncoding) {
|
|
MCContext &context = streamer.getContext();
|
|
unsigned format = symbolEncoding & 0x0f;
|
|
switch (format) {
|
|
default:
|
|
assert(0 && "Unknown Encoding");
|
|
case dwarf::DW_EH_PE_absptr:
|
|
case dwarf::DW_EH_PE_signed:
|
|
return context.getAsmInfo().getPointerSize();
|
|
case dwarf::DW_EH_PE_udata2:
|
|
case dwarf::DW_EH_PE_sdata2:
|
|
return 2;
|
|
case dwarf::DW_EH_PE_udata4:
|
|
case dwarf::DW_EH_PE_sdata4:
|
|
return 4;
|
|
case dwarf::DW_EH_PE_udata8:
|
|
case dwarf::DW_EH_PE_sdata8:
|
|
return 8;
|
|
}
|
|
}
|
|
|
|
static void EmitSymbol(MCStreamer &streamer, const MCSymbol &symbol,
|
|
unsigned symbolEncoding, const char *comment = 0) {
|
|
MCContext &context = streamer.getContext();
|
|
const MCAsmInfo &asmInfo = context.getAsmInfo();
|
|
const MCExpr *v = asmInfo.getExprForFDESymbol(&symbol,
|
|
symbolEncoding,
|
|
streamer);
|
|
unsigned size = getSizeForEncoding(streamer, symbolEncoding);
|
|
if (streamer.isVerboseAsm() && comment) streamer.AddComment(comment);
|
|
streamer.EmitAbsValue(v, size);
|
|
}
|
|
|
|
static void EmitPersonality(MCStreamer &streamer, const MCSymbol &symbol,
|
|
unsigned symbolEncoding) {
|
|
MCContext &context = streamer.getContext();
|
|
const MCAsmInfo &asmInfo = context.getAsmInfo();
|
|
const MCExpr *v = asmInfo.getExprForPersonalitySymbol(&symbol,
|
|
symbolEncoding,
|
|
streamer);
|
|
unsigned size = getSizeForEncoding(streamer, symbolEncoding);
|
|
streamer.EmitValue(v, size);
|
|
}
|
|
|
|
static const MachineLocation TranslateMachineLocation(
|
|
const MCRegisterInfo &MRI,
|
|
const MachineLocation &Loc) {
|
|
unsigned Reg = Loc.getReg() == MachineLocation::VirtualFP ?
|
|
MachineLocation::VirtualFP :
|
|
unsigned(MRI.getDwarfRegNum(Loc.getReg(), true));
|
|
const MachineLocation &NewLoc = Loc.isReg() ?
|
|
MachineLocation(Reg) : MachineLocation(Reg, Loc.getOffset());
|
|
return NewLoc;
|
|
}
|
|
|
|
namespace {
|
|
class FrameEmitterImpl {
|
|
int CFAOffset;
|
|
int CIENum;
|
|
bool UsingCFI;
|
|
bool IsEH;
|
|
const MCSymbol *SectionStart;
|
|
public:
|
|
FrameEmitterImpl(bool usingCFI, bool isEH)
|
|
: CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH),
|
|
SectionStart(0) {}
|
|
|
|
void setSectionStart(const MCSymbol *Label) { SectionStart = Label; }
|
|
|
|
/// EmitCompactUnwind - Emit the unwind information in a compact way. If
|
|
/// we're successful, return 'true'. Otherwise, return 'false' and it will
|
|
/// emit the normal CIE and FDE.
|
|
bool EmitCompactUnwind(MCStreamer &streamer,
|
|
const MCDwarfFrameInfo &frame);
|
|
|
|
const MCSymbol &EmitCIE(MCStreamer &streamer,
|
|
const MCSymbol *personality,
|
|
unsigned personalityEncoding,
|
|
const MCSymbol *lsda,
|
|
unsigned lsdaEncoding);
|
|
MCSymbol *EmitFDE(MCStreamer &streamer,
|
|
const MCSymbol &cieStart,
|
|
const MCDwarfFrameInfo &frame);
|
|
void EmitCFIInstructions(MCStreamer &streamer,
|
|
const std::vector<MCCFIInstruction> &Instrs,
|
|
MCSymbol *BaseLabel);
|
|
void EmitCFIInstruction(MCStreamer &Streamer,
|
|
const MCCFIInstruction &Instr);
|
|
};
|
|
|
|
} // end anonymous namespace
|
|
|
|
static void EmitEncodingByte(MCStreamer &Streamer, unsigned Encoding,
|
|
StringRef Prefix) {
|
|
if (Streamer.isVerboseAsm()) {
|
|
const char *EncStr = 0;
|
|
switch (Encoding) {
|
|
default: EncStr = "<unknown encoding>";
|
|
case dwarf::DW_EH_PE_absptr: EncStr = "absptr";
|
|
case dwarf::DW_EH_PE_omit: EncStr = "omit";
|
|
case dwarf::DW_EH_PE_pcrel: EncStr = "pcrel";
|
|
case dwarf::DW_EH_PE_udata4: EncStr = "udata4";
|
|
case dwarf::DW_EH_PE_udata8: EncStr = "udata8";
|
|
case dwarf::DW_EH_PE_sdata4: EncStr = "sdata4";
|
|
case dwarf::DW_EH_PE_sdata8: EncStr = "sdata8";
|
|
case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4: EncStr = "pcrel udata4";
|
|
case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4: EncStr = "pcrel sdata4";
|
|
case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8: EncStr = "pcrel udata8";
|
|
case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8: EncStr = "pcrel sdata8";
|
|
case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata4:
|
|
EncStr = "indirect pcrel udata4";
|
|
case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata4:
|
|
EncStr = "indirect pcrel sdata4";
|
|
case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata8:
|
|
EncStr = "indirect pcrel udata8";
|
|
case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata8:
|
|
EncStr = "indirect pcrel sdata8";
|
|
}
|
|
|
|
Streamer.AddComment(Twine(Prefix) + " = " + EncStr);
|
|
}
|
|
|
|
Streamer.EmitIntValue(Encoding, 1);
|
|
}
|
|
|
|
void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer,
|
|
const MCCFIInstruction &Instr) {
|
|
int dataAlignmentFactor = getDataAlignmentFactor(Streamer);
|
|
bool VerboseAsm = Streamer.isVerboseAsm();
|
|
|
|
switch (Instr.getOperation()) {
|
|
case MCCFIInstruction::Move:
|
|
case MCCFIInstruction::RelMove: {
|
|
const MachineLocation &Dst = Instr.getDestination();
|
|
const MachineLocation &Src = Instr.getSource();
|
|
const bool IsRelative = Instr.getOperation() == MCCFIInstruction::RelMove;
|
|
|
|
// If advancing cfa.
|
|
if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
|
|
if (Src.getReg() == MachineLocation::VirtualFP) {
|
|
if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_offset");
|
|
Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1);
|
|
} else {
|
|
if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa");
|
|
Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1);
|
|
if (VerboseAsm) Streamer.AddComment(Twine("Reg ") +
|
|
Twine(Src.getReg()));
|
|
Streamer.EmitULEB128IntValue(Src.getReg());
|
|
}
|
|
|
|
if (IsRelative)
|
|
CFAOffset += Src.getOffset();
|
|
else
|
|
CFAOffset = -Src.getOffset();
|
|
|
|
if (VerboseAsm) Streamer.AddComment(Twine("Offset " + Twine(CFAOffset)));
|
|
Streamer.EmitULEB128IntValue(CFAOffset);
|
|
return;
|
|
}
|
|
|
|
if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) {
|
|
assert(Dst.isReg() && "Machine move not supported yet.");
|
|
if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_register");
|
|
Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1);
|
|
if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Dst.getReg()));
|
|
Streamer.EmitULEB128IntValue(Dst.getReg());
|
|
return;
|
|
}
|
|
|
|
unsigned Reg = Src.getReg();
|
|
int Offset = Dst.getOffset();
|
|
if (IsRelative)
|
|
Offset -= CFAOffset;
|
|
Offset = Offset / dataAlignmentFactor;
|
|
|
|
if (Offset < 0) {
|
|
if (VerboseAsm) Streamer.AddComment("DW_CFA_offset_extended_sf");
|
|
Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1);
|
|
if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg));
|
|
Streamer.EmitULEB128IntValue(Reg);
|
|
if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset));
|
|
Streamer.EmitSLEB128IntValue(Offset);
|
|
} else if (Reg < 64) {
|
|
if (VerboseAsm) Streamer.AddComment(Twine("DW_CFA_offset + Reg(") +
|
|
Twine(Reg) + ")");
|
|
Streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1);
|
|
if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset));
|
|
Streamer.EmitULEB128IntValue(Offset);
|
|
} else {
|
|
if (VerboseAsm) Streamer.AddComment("DW_CFA_offset_extended");
|
|
Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1);
|
|
if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg));
|
|
Streamer.EmitULEB128IntValue(Reg);
|
|
if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset));
|
|
Streamer.EmitULEB128IntValue(Offset);
|
|
}
|
|
return;
|
|
}
|
|
case MCCFIInstruction::Remember:
|
|
if (VerboseAsm) Streamer.AddComment("DW_CFA_remember_state");
|
|
Streamer.EmitIntValue(dwarf::DW_CFA_remember_state, 1);
|
|
return;
|
|
case MCCFIInstruction::Restore:
|
|
if (VerboseAsm) Streamer.AddComment("DW_CFA_restore_state");
|
|
Streamer.EmitIntValue(dwarf::DW_CFA_restore_state, 1);
|
|
return;
|
|
case MCCFIInstruction::SameValue: {
|
|
unsigned Reg = Instr.getDestination().getReg();
|
|
if (VerboseAsm) Streamer.AddComment("DW_CFA_same_value");
|
|
Streamer.EmitIntValue(dwarf::DW_CFA_same_value, 1);
|
|
if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg));
|
|
Streamer.EmitULEB128IntValue(Reg);
|
|
return;
|
|
}
|
|
}
|
|
llvm_unreachable("Unhandled case in switch");
|
|
}
|
|
|
|
/// EmitFrameMoves - Emit frame instructions to describe the layout of the
|
|
/// frame.
|
|
void FrameEmitterImpl::EmitCFIInstructions(MCStreamer &streamer,
|
|
const std::vector<MCCFIInstruction> &Instrs,
|
|
MCSymbol *BaseLabel) {
|
|
for (unsigned i = 0, N = Instrs.size(); i < N; ++i) {
|
|
const MCCFIInstruction &Instr = Instrs[i];
|
|
MCSymbol *Label = Instr.getLabel();
|
|
// Throw out move if the label is invalid.
|
|
if (Label && !Label->isDefined()) continue; // Not emitted, in dead code.
|
|
|
|
// Advance row if new location.
|
|
if (BaseLabel && Label) {
|
|
MCSymbol *ThisSym = Label;
|
|
if (ThisSym != BaseLabel) {
|
|
if (streamer.isVerboseAsm()) streamer.AddComment("DW_CFA_advance_loc4");
|
|
streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym);
|
|
BaseLabel = ThisSym;
|
|
}
|
|
}
|
|
|
|
EmitCFIInstruction(streamer, Instr);
|
|
}
|
|
}
|
|
|
|
/// EmitCompactUnwind - Emit the unwind information in a compact way. If we're
|
|
/// successful, return 'true'. Otherwise, return 'false' and it will emit the
|
|
/// normal CIE and FDE.
|
|
bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
|
|
const MCDwarfFrameInfo &Frame) {
|
|
MCContext &Context = Streamer.getContext();
|
|
const MCObjectFileInfo *MOFI = Context.getObjectFileInfo();
|
|
bool VerboseAsm = Streamer.isVerboseAsm();
|
|
|
|
// range-start range-length compact-unwind-enc personality-func lsda
|
|
// _foo LfooEnd-_foo 0x00000023 0 0
|
|
// _bar LbarEnd-_bar 0x00000025 __gxx_personality except_tab1
|
|
//
|
|
// .section __LD,__compact_unwind,regular,debug
|
|
//
|
|
// # compact unwind for _foo
|
|
// .quad _foo
|
|
// .set L1,LfooEnd-_foo
|
|
// .long L1
|
|
// .long 0x01010001
|
|
// .quad 0
|
|
// .quad 0
|
|
//
|
|
// # compact unwind for _bar
|
|
// .quad _bar
|
|
// .set L2,LbarEnd-_bar
|
|
// .long L2
|
|
// .long 0x01020011
|
|
// .quad __gxx_personality
|
|
// .quad except_tab1
|
|
|
|
uint32_t Encoding = Frame.CompactUnwindEncoding;
|
|
if (!Encoding) return false;
|
|
|
|
// The encoding needs to know we have an LSDA.
|
|
if (Frame.Lsda)
|
|
Encoding |= 0x40000000;
|
|
|
|
Streamer.SwitchSection(MOFI->getCompactUnwindSection());
|
|
|
|
// Range Start
|
|
unsigned FDEEncoding = MOFI->getFDEEncoding(UsingCFI);
|
|
unsigned Size = getSizeForEncoding(Streamer, FDEEncoding);
|
|
if (VerboseAsm) Streamer.AddComment("Range Start");
|
|
Streamer.EmitSymbolValue(Frame.Function, Size);
|
|
|
|
// Range Length
|
|
const MCExpr *Range = MakeStartMinusEndExpr(Streamer, *Frame.Begin,
|
|
*Frame.End, 0);
|
|
if (VerboseAsm) Streamer.AddComment("Range Length");
|
|
Streamer.EmitAbsValue(Range, 4);
|
|
|
|
// Compact Encoding
|
|
Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_udata4);
|
|
if (VerboseAsm) Streamer.AddComment("Compact Unwind Encoding: 0x" +
|
|
Twine::utohexstr(Encoding));
|
|
Streamer.EmitIntValue(Encoding, Size);
|
|
|
|
|
|
// Personality Function
|
|
Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_absptr);
|
|
if (VerboseAsm) Streamer.AddComment("Personality Function");
|
|
if (Frame.Personality)
|
|
Streamer.EmitSymbolValue(Frame.Personality, Size);
|
|
else
|
|
Streamer.EmitIntValue(0, Size); // No personality fn
|
|
|
|
// LSDA
|
|
Size = getSizeForEncoding(Streamer, Frame.LsdaEncoding);
|
|
if (VerboseAsm) Streamer.AddComment("LSDA");
|
|
if (Frame.Lsda)
|
|
Streamer.EmitSymbolValue(Frame.Lsda, Size);
|
|
else
|
|
Streamer.EmitIntValue(0, Size); // No LSDA
|
|
|
|
return true;
|
|
}
|
|
|
|
const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
|
|
const MCSymbol *personality,
|
|
unsigned personalityEncoding,
|
|
const MCSymbol *lsda,
|
|
unsigned lsdaEncoding) {
|
|
MCContext &context = streamer.getContext();
|
|
const MCRegisterInfo &MRI = context.getRegisterInfo();
|
|
const MCObjectFileInfo *MOFI = context.getObjectFileInfo();
|
|
bool verboseAsm = streamer.isVerboseAsm();
|
|
|
|
MCSymbol *sectionStart;
|
|
if (MOFI->isFunctionEHFrameSymbolPrivate() || !IsEH)
|
|
sectionStart = context.CreateTempSymbol();
|
|
else
|
|
sectionStart = context.GetOrCreateSymbol(Twine("EH_frame") + Twine(CIENum));
|
|
|
|
streamer.EmitLabel(sectionStart);
|
|
CIENum++;
|
|
|
|
MCSymbol *sectionEnd = context.CreateTempSymbol();
|
|
|
|
// Length
|
|
const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart,
|
|
*sectionEnd, 4);
|
|
if (verboseAsm) streamer.AddComment("CIE Length");
|
|
streamer.EmitAbsValue(Length, 4);
|
|
|
|
// CIE ID
|
|
unsigned CIE_ID = IsEH ? 0 : -1;
|
|
if (verboseAsm) streamer.AddComment("CIE ID Tag");
|
|
streamer.EmitIntValue(CIE_ID, 4);
|
|
|
|
// Version
|
|
if (verboseAsm) streamer.AddComment("DW_CIE_VERSION");
|
|
streamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1);
|
|
|
|
// Augmentation String
|
|
SmallString<8> Augmentation;
|
|
if (IsEH) {
|
|
if (verboseAsm) streamer.AddComment("CIE Augmentation");
|
|
Augmentation += "z";
|
|
if (personality)
|
|
Augmentation += "P";
|
|
if (lsda)
|
|
Augmentation += "L";
|
|
Augmentation += "R";
|
|
streamer.EmitBytes(Augmentation.str(), 0);
|
|
}
|
|
streamer.EmitIntValue(0, 1);
|
|
|
|
// Code Alignment Factor
|
|
if (verboseAsm) streamer.AddComment("CIE Code Alignment Factor");
|
|
streamer.EmitULEB128IntValue(1);
|
|
|
|
// Data Alignment Factor
|
|
if (verboseAsm) streamer.AddComment("CIE Data Alignment Factor");
|
|
streamer.EmitSLEB128IntValue(getDataAlignmentFactor(streamer));
|
|
|
|
// Return Address Register
|
|
if (verboseAsm) streamer.AddComment("CIE Return Address Column");
|
|
streamer.EmitULEB128IntValue(MRI.getDwarfRegNum(MRI.getRARegister(), true));
|
|
|
|
// Augmentation Data Length (optional)
|
|
|
|
unsigned augmentationLength = 0;
|
|
if (IsEH) {
|
|
if (personality) {
|
|
// Personality Encoding
|
|
augmentationLength += 1;
|
|
// Personality
|
|
augmentationLength += getSizeForEncoding(streamer, personalityEncoding);
|
|
}
|
|
if (lsda)
|
|
augmentationLength += 1;
|
|
// Encoding of the FDE pointers
|
|
augmentationLength += 1;
|
|
|
|
if (verboseAsm) streamer.AddComment("Augmentation Size");
|
|
streamer.EmitULEB128IntValue(augmentationLength);
|
|
|
|
// Augmentation Data (optional)
|
|
if (personality) {
|
|
// Personality Encoding
|
|
EmitEncodingByte(streamer, personalityEncoding,
|
|
"Personality Encoding");
|
|
// Personality
|
|
if (verboseAsm) streamer.AddComment("Personality");
|
|
EmitPersonality(streamer, *personality, personalityEncoding);
|
|
}
|
|
|
|
if (lsda)
|
|
EmitEncodingByte(streamer, lsdaEncoding, "LSDA Encoding");
|
|
|
|
// Encoding of the FDE pointers
|
|
EmitEncodingByte(streamer, MOFI->getFDEEncoding(UsingCFI),
|
|
"FDE Encoding");
|
|
}
|
|
|
|
// Initial Instructions
|
|
|
|
const MCAsmInfo &MAI = context.getAsmInfo();
|
|
const std::vector<MachineMove> &Moves = MAI.getInitialFrameState();
|
|
std::vector<MCCFIInstruction> Instructions;
|
|
|
|
for (int i = 0, n = Moves.size(); i != n; ++i) {
|
|
MCSymbol *Label = Moves[i].getLabel();
|
|
const MachineLocation &Dst =
|
|
TranslateMachineLocation(MRI, Moves[i].getDestination());
|
|
const MachineLocation &Src =
|
|
TranslateMachineLocation(MRI, Moves[i].getSource());
|
|
MCCFIInstruction Inst(Label, Dst, Src);
|
|
Instructions.push_back(Inst);
|
|
}
|
|
|
|
EmitCFIInstructions(streamer, Instructions, NULL);
|
|
|
|
// Padding
|
|
streamer.EmitValueToAlignment(IsEH
|
|
? 4 : context.getAsmInfo().getPointerSize());
|
|
|
|
streamer.EmitLabel(sectionEnd);
|
|
return *sectionStart;
|
|
}
|
|
|
|
MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
|
|
const MCSymbol &cieStart,
|
|
const MCDwarfFrameInfo &frame) {
|
|
MCContext &context = streamer.getContext();
|
|
MCSymbol *fdeStart = context.CreateTempSymbol();
|
|
MCSymbol *fdeEnd = context.CreateTempSymbol();
|
|
const MCObjectFileInfo *MOFI = context.getObjectFileInfo();
|
|
bool verboseAsm = streamer.isVerboseAsm();
|
|
|
|
if (IsEH && frame.Function && !MOFI->isFunctionEHFrameSymbolPrivate()) {
|
|
MCSymbol *EHSym =
|
|
context.GetOrCreateSymbol(frame.Function->getName() + Twine(".eh"));
|
|
streamer.EmitEHSymAttributes(frame.Function, EHSym);
|
|
streamer.EmitLabel(EHSym);
|
|
}
|
|
|
|
// Length
|
|
const MCExpr *Length = MakeStartMinusEndExpr(streamer, *fdeStart, *fdeEnd, 0);
|
|
if (verboseAsm) streamer.AddComment("FDE Length");
|
|
streamer.EmitAbsValue(Length, 4);
|
|
|
|
streamer.EmitLabel(fdeStart);
|
|
|
|
// CIE Pointer
|
|
const MCAsmInfo &asmInfo = context.getAsmInfo();
|
|
if (IsEH) {
|
|
const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart,
|
|
0);
|
|
if (verboseAsm) streamer.AddComment("FDE CIE Offset");
|
|
streamer.EmitAbsValue(offset, 4);
|
|
} else if (!asmInfo.doesDwarfRequireRelocationForSectionOffset()) {
|
|
const MCExpr *offset = MakeStartMinusEndExpr(streamer, *SectionStart,
|
|
cieStart, 0);
|
|
streamer.EmitAbsValue(offset, 4);
|
|
} else {
|
|
streamer.EmitSymbolValue(&cieStart, 4);
|
|
}
|
|
|
|
unsigned fdeEncoding = MOFI->getFDEEncoding(UsingCFI);
|
|
unsigned size = getSizeForEncoding(streamer, fdeEncoding);
|
|
|
|
// PC Begin
|
|
unsigned PCBeginEncoding = IsEH ? fdeEncoding :
|
|
(unsigned)dwarf::DW_EH_PE_absptr;
|
|
unsigned PCBeginSize = getSizeForEncoding(streamer, PCBeginEncoding);
|
|
EmitSymbol(streamer, *frame.Begin, PCBeginEncoding, "FDE initial location");
|
|
|
|
// PC Range
|
|
const MCExpr *Range = MakeStartMinusEndExpr(streamer, *frame.Begin,
|
|
*frame.End, 0);
|
|
if (verboseAsm) streamer.AddComment("FDE address range");
|
|
streamer.EmitAbsValue(Range, size);
|
|
|
|
if (IsEH) {
|
|
// Augmentation Data Length
|
|
unsigned augmentationLength = 0;
|
|
|
|
if (frame.Lsda)
|
|
augmentationLength += getSizeForEncoding(streamer, frame.LsdaEncoding);
|
|
|
|
if (verboseAsm) streamer.AddComment("Augmentation size");
|
|
streamer.EmitULEB128IntValue(augmentationLength);
|
|
|
|
// Augmentation Data
|
|
if (frame.Lsda)
|
|
EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding,
|
|
"Language Specific Data Area");
|
|
}
|
|
|
|
// Call Frame Instructions
|
|
|
|
EmitCFIInstructions(streamer, frame.Instructions, frame.Begin);
|
|
|
|
// Padding
|
|
streamer.EmitValueToAlignment(PCBeginSize);
|
|
|
|
return fdeEnd;
|
|
}
|
|
|
|
namespace {
|
|
struct CIEKey {
|
|
static const CIEKey getEmptyKey() { return CIEKey(0, 0, -1); }
|
|
static const CIEKey getTombstoneKey() { return CIEKey(0, -1, 0); }
|
|
|
|
CIEKey(const MCSymbol* Personality_, unsigned PersonalityEncoding_,
|
|
unsigned LsdaEncoding_) : Personality(Personality_),
|
|
PersonalityEncoding(PersonalityEncoding_),
|
|
LsdaEncoding(LsdaEncoding_) {
|
|
}
|
|
const MCSymbol* Personality;
|
|
unsigned PersonalityEncoding;
|
|
unsigned LsdaEncoding;
|
|
};
|
|
}
|
|
|
|
namespace llvm {
|
|
template <>
|
|
struct DenseMapInfo<CIEKey> {
|
|
static CIEKey getEmptyKey() {
|
|
return CIEKey::getEmptyKey();
|
|
}
|
|
static CIEKey getTombstoneKey() {
|
|
return CIEKey::getTombstoneKey();
|
|
}
|
|
static unsigned getHashValue(const CIEKey &Key) {
|
|
FoldingSetNodeID ID;
|
|
ID.AddPointer(Key.Personality);
|
|
ID.AddInteger(Key.PersonalityEncoding);
|
|
ID.AddInteger(Key.LsdaEncoding);
|
|
return ID.ComputeHash();
|
|
}
|
|
static bool isEqual(const CIEKey &LHS,
|
|
const CIEKey &RHS) {
|
|
return LHS.Personality == RHS.Personality &&
|
|
LHS.PersonalityEncoding == RHS.PersonalityEncoding &&
|
|
LHS.LsdaEncoding == RHS.LsdaEncoding;
|
|
}
|
|
};
|
|
}
|
|
|
|
void MCDwarfFrameEmitter::Emit(MCStreamer &Streamer,
|
|
bool UsingCFI,
|
|
bool IsEH) {
|
|
MCContext &Context = Streamer.getContext();
|
|
MCObjectFileInfo *MOFI =
|
|
const_cast<MCObjectFileInfo*>(Context.getObjectFileInfo());
|
|
FrameEmitterImpl Emitter(UsingCFI, IsEH);
|
|
ArrayRef<MCDwarfFrameInfo> FrameArray = Streamer.getFrameInfos();
|
|
|
|
// Emit the compact unwind info if available.
|
|
// FIXME: This emits both the compact unwind and the old CIE/FDE
|
|
// information. Only one of those is needed.
|
|
// FIXME: Disable. This seems to still be causing failures.
|
|
if (false && IsEH && MOFI->getCompactUnwindSection())
|
|
for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) {
|
|
const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i);
|
|
if (Frame.CompactUnwindEncoding)
|
|
Emitter.EmitCompactUnwind(Streamer, Frame);
|
|
}
|
|
|
|
const MCSection &Section = IsEH ? *MOFI->getEHFrameSection() :
|
|
*MOFI->getDwarfFrameSection();
|
|
Streamer.SwitchSection(&Section);
|
|
MCSymbol *SectionStart = Context.CreateTempSymbol();
|
|
Streamer.EmitLabel(SectionStart);
|
|
Emitter.setSectionStart(SectionStart);
|
|
|
|
MCSymbol *FDEEnd = NULL;
|
|
DenseMap<CIEKey, const MCSymbol*> CIEStarts;
|
|
|
|
const MCSymbol *DummyDebugKey = NULL;
|
|
for (unsigned i = 0, n = FrameArray.size(); i < n; ++i) {
|
|
const MCDwarfFrameInfo &Frame = FrameArray[i];
|
|
CIEKey Key(Frame.Personality, Frame.PersonalityEncoding,
|
|
Frame.LsdaEncoding);
|
|
const MCSymbol *&CIEStart = IsEH ? CIEStarts[Key] : DummyDebugKey;
|
|
if (!CIEStart)
|
|
CIEStart = &Emitter.EmitCIE(Streamer, Frame.Personality,
|
|
Frame.PersonalityEncoding, Frame.Lsda,
|
|
Frame.LsdaEncoding);
|
|
|
|
FDEEnd = Emitter.EmitFDE(Streamer, *CIEStart, Frame);
|
|
|
|
if (i != n - 1)
|
|
Streamer.EmitLabel(FDEEnd);
|
|
}
|
|
|
|
Streamer.EmitValueToAlignment(Context.getAsmInfo().getPointerSize());
|
|
if (FDEEnd)
|
|
Streamer.EmitLabel(FDEEnd);
|
|
}
|
|
|
|
void MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer,
|
|
uint64_t AddrDelta) {
|
|
SmallString<256> Tmp;
|
|
raw_svector_ostream OS(Tmp);
|
|
MCDwarfFrameEmitter::EncodeAdvanceLoc(AddrDelta, OS);
|
|
Streamer.EmitBytes(OS.str(), /*AddrSpace=*/0);
|
|
}
|
|
|
|
void MCDwarfFrameEmitter::EncodeAdvanceLoc(uint64_t AddrDelta,
|
|
raw_ostream &OS) {
|
|
// FIXME: Assumes the code alignment factor is 1.
|
|
if (AddrDelta == 0) {
|
|
} else if (isUIntN(6, AddrDelta)) {
|
|
uint8_t Opcode = dwarf::DW_CFA_advance_loc | AddrDelta;
|
|
OS << Opcode;
|
|
} else if (isUInt<8>(AddrDelta)) {
|
|
OS << uint8_t(dwarf::DW_CFA_advance_loc1);
|
|
OS << uint8_t(AddrDelta);
|
|
} else if (isUInt<16>(AddrDelta)) {
|
|
// FIXME: check what is the correct behavior on a big endian machine.
|
|
OS << uint8_t(dwarf::DW_CFA_advance_loc2);
|
|
OS << uint8_t( AddrDelta & 0xff);
|
|
OS << uint8_t((AddrDelta >> 8) & 0xff);
|
|
} else {
|
|
// FIXME: check what is the correct behavior on a big endian machine.
|
|
assert(isUInt<32>(AddrDelta));
|
|
OS << uint8_t(dwarf::DW_CFA_advance_loc4);
|
|
OS << uint8_t( AddrDelta & 0xff);
|
|
OS << uint8_t((AddrDelta >> 8) & 0xff);
|
|
OS << uint8_t((AddrDelta >> 16) & 0xff);
|
|
OS << uint8_t((AddrDelta >> 24) & 0xff);
|
|
|
|
}
|
|
}
|