mirror of
https://github.com/c64scene-ar/llvm-6502.git
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f88dce1f89
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100355 91177308-0d34-0410-b5e6-96231b3b80d8
130 lines
4.5 KiB
C++
130 lines
4.5 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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void DwarfPrinter::EmitSectionOffset(const MCSymbol *Label,
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const MCSymbol *Section, bool IsSmall) {
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bool 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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Asm->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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Asm->EmitCFAByte(dwarf::DW_CFA_def_cfa_offset);
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} else {
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Asm->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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Asm->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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Asm->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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Asm->EmitCFAByte(dwarf::DW_CFA_offset + Reg);
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Asm->EmitULEB128(Offset, "Offset");
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} else {
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Asm->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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