mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100347 91177308-0d34-0410-b5e6-96231b3b80d8
227 lines
8.3 KiB
C++
227 lines
8.3 KiB
C++
//===--- lib/CodeGen/DwarfPrinter.cpp - Dwarf Printer ---------------------===//
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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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//
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// Emit general DWARF directives.
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//
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//===----------------------------------------------------------------------===//
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#include "DwarfPrinter.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfo.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/MCExpr.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/Target/TargetData.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/ADT/SmallString.h"
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using namespace llvm;
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DwarfPrinter::DwarfPrinter(AsmPrinter *A)
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: Asm(A), MAI(A->MAI), TD(Asm->TM.getTargetData()),
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RI(Asm->TM.getRegisterInfo()), M(NULL), MF(NULL), MMI(NULL),
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SubprogramCount(0) {}
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/// SizeOfEncodedValue - Return the size of the encoding in bytes.
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unsigned DwarfPrinter::SizeOfEncodedValue(unsigned Encoding) const {
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if (Encoding == dwarf::DW_EH_PE_omit)
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return 0;
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switch (Encoding & 0x07) {
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case dwarf::DW_EH_PE_absptr:
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return TD->getPointerSize();
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case dwarf::DW_EH_PE_udata2:
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return 2;
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case dwarf::DW_EH_PE_udata4:
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return 4;
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case dwarf::DW_EH_PE_udata8:
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return 8;
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}
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assert(0 && "Invalid encoded value.");
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return 0;
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}
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static const char *DecodeDWARFEncoding(unsigned Encoding) {
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switch (Encoding) {
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case dwarf::DW_EH_PE_absptr: return "absptr";
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case dwarf::DW_EH_PE_omit: return "omit";
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case dwarf::DW_EH_PE_pcrel: return "pcrel";
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case dwarf::DW_EH_PE_udata4: return "udata4";
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case dwarf::DW_EH_PE_udata8: return "udata8";
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case dwarf::DW_EH_PE_sdata4: return "sdata4";
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case dwarf::DW_EH_PE_sdata8: return "sdata8";
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case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4: return "pcrel udata4";
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case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4: return "pcrel sdata4";
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case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8: return "pcrel udata8";
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case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8: return "pcrel sdata8";
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case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
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return "indirect pcrel udata4";
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case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
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return "indirect pcrel sdata4";
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case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
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return "indirect pcrel udata8";
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case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
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return "indirect pcrel sdata8";
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}
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return "<unknown encoding>";
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}
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/// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
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/// encoding. If verbose assembly output is enabled, we output comments
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/// describing the encoding. Desc is an optional string saying what the
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/// encoding is specifying (e.g. "LSDA").
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void DwarfPrinter::EmitEncodingByte(unsigned Val, const char *Desc) {
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if (Asm->isVerbose()) {
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if (Desc != 0)
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Asm->OutStreamer.AddComment(Twine(Desc)+" Encoding = " +
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Twine(DecodeDWARFEncoding(Val)));
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else
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Asm->OutStreamer.AddComment(Twine("Encoding = ") +
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DecodeDWARFEncoding(Val));
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}
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Asm->OutStreamer.EmitIntValue(Val, 1, 0/*addrspace*/);
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}
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/// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
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void DwarfPrinter::EmitCFAByte(unsigned Val) {
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if (Asm->isVerbose()) {
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if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset+64)
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Asm->OutStreamer.AddComment("DW_CFA_offset + Reg (" +
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Twine(Val-dwarf::DW_CFA_offset) + ")");
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else
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Asm->OutStreamer.AddComment(dwarf::CallFrameString(Val));
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}
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Asm->OutStreamer.EmitIntValue(Val, 1, 0/*addrspace*/);
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}
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void DwarfPrinter::EmitReference(const MCSymbol *Sym, unsigned Encoding) const {
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const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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const MCExpr *Exp = TLOF.getExprForDwarfReference(Sym, Asm->Mang,
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Asm->MMI, Encoding,
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Asm->OutStreamer);
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Asm->OutStreamer.EmitValue(Exp, SizeOfEncodedValue(Encoding), /*addrspace*/0);
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}
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void DwarfPrinter::EmitReference(const GlobalValue *GV, unsigned Encoding)const{
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const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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const MCExpr *Exp =
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TLOF.getExprForDwarfGlobalReference(GV, Asm->Mang, Asm->MMI, Encoding,
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Asm->OutStreamer);
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Asm->OutStreamer.EmitValue(Exp, SizeOfEncodedValue(Encoding), /*addrspace*/0);
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}
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void DwarfPrinter::EmitSectionOffset(const MCSymbol *Label,
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const MCSymbol *Section,
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bool IsSmall, bool isEH) {
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bool isAbsolute;
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if (isEH)
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isAbsolute = MAI->isAbsoluteEHSectionOffsets();
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else
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isAbsolute = MAI->isAbsoluteDebugSectionOffsets();
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if (!isAbsolute)
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return Asm->EmitLabelDifference(Label, Section,
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IsSmall ? 4 : TD->getPointerSize());
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// On COFF targets, we have to emit the weird .secrel32 directive.
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if (const char *SecOffDir = MAI->getDwarfSectionOffsetDirective()) {
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// FIXME: MCize.
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Asm->OutStreamer.EmitRawText(SecOffDir + Twine(Label->getName()));
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} else {
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unsigned Size = IsSmall ? 4 : TD->getPointerSize();
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Asm->OutStreamer.EmitSymbolValue(Label, Size, 0/*AddrSpace*/);
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}
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}
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/// EmitFrameMoves - Emit frame instructions to describe the layout of the
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/// frame.
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void DwarfPrinter::EmitFrameMoves(MCSymbol *BaseLabel,
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const std::vector<MachineMove> &Moves,
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bool isEH) {
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int stackGrowth = TD->getPointerSize();
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if (Asm->TM.getFrameInfo()->getStackGrowthDirection() !=
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TargetFrameInfo::StackGrowsUp)
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stackGrowth *= -1;
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for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
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const MachineMove &Move = Moves[i];
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MCSymbol *Label = Move.getLabel();
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// Throw out move if the label is invalid.
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if (Label && !Label->isDefined()) continue; // Not emitted, in dead code.
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const MachineLocation &Dst = Move.getDestination();
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const MachineLocation &Src = Move.getSource();
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// Advance row if new location.
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if (BaseLabel && Label) {
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MCSymbol *ThisSym = Label;
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if (ThisSym != BaseLabel) {
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EmitCFAByte(dwarf::DW_CFA_advance_loc4);
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Asm->EmitLabelDifference(ThisSym, BaseLabel, 4);
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BaseLabel = ThisSym;
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}
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}
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// If advancing cfa.
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if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
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if (!Src.isReg()) {
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if (Src.getReg() == MachineLocation::VirtualFP) {
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EmitCFAByte(dwarf::DW_CFA_def_cfa_offset);
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} else {
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EmitCFAByte(dwarf::DW_CFA_def_cfa);
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Asm->EmitULEB128(RI->getDwarfRegNum(Src.getReg(), isEH), "Register");
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}
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int Offset = -Src.getOffset();
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Asm->EmitULEB128(Offset, "Offset");
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} else {
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llvm_unreachable("Machine move not supported yet.");
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}
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} else if (Src.isReg() &&
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Src.getReg() == MachineLocation::VirtualFP) {
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if (Dst.isReg()) {
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EmitCFAByte(dwarf::DW_CFA_def_cfa_register);
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Asm->EmitULEB128(RI->getDwarfRegNum(Dst.getReg(), isEH), "Register");
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} else {
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llvm_unreachable("Machine move not supported yet.");
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}
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} else {
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unsigned Reg = RI->getDwarfRegNum(Src.getReg(), isEH);
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int Offset = Dst.getOffset() / stackGrowth;
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if (Offset < 0) {
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EmitCFAByte(dwarf::DW_CFA_offset_extended_sf);
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Asm->EmitULEB128(Reg, "Reg");
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Asm->EmitSLEB128(Offset, "Offset");
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} else if (Reg < 64) {
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EmitCFAByte(dwarf::DW_CFA_offset + Reg);
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Asm->EmitULEB128(Offset, "Offset");
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} else {
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EmitCFAByte(dwarf::DW_CFA_offset_extended);
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Asm->EmitULEB128(Reg, "Reg");
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Asm->EmitULEB128(Offset, "Offset");
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}
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}
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}
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}
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