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address space. Reordered the EmitULEB128IntValue arguments to make this easier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171949 91177308-0d34-0410-b5e6-96231b3b80d8
197 lines
7.5 KiB
C++
197 lines
7.5 KiB
C++
//===-- AsmPrinterDwarf.cpp - AsmPrinter Dwarf Support --------------------===//
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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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// This file implements the Dwarf emissions parts of AsmPrinter.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCSection.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/MachineLocation.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/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Dwarf Emission Helper Routines
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//===----------------------------------------------------------------------===//
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/// EmitSLEB128 - emit the specified signed leb128 value.
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void AsmPrinter::EmitSLEB128(int Value, const char *Desc) const {
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if (isVerbose() && Desc)
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OutStreamer.AddComment(Desc);
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OutStreamer.EmitSLEB128IntValue(Value);
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}
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/// EmitULEB128 - emit the specified signed leb128 value.
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void AsmPrinter::EmitULEB128(unsigned Value, const char *Desc,
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unsigned PadTo) const {
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if (isVerbose() && Desc)
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OutStreamer.AddComment(Desc);
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OutStreamer.EmitULEB128IntValue(Value, PadTo);
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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 AsmPrinter::EmitCFAByte(unsigned Val) const {
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if (isVerbose()) {
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if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset+64)
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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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OutStreamer.AddComment(dwarf::CallFrameString(Val));
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}
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OutStreamer.EmitIntValue(Val, 1);
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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 AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const {
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if (isVerbose()) {
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if (Desc != 0)
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OutStreamer.AddComment(Twine(Desc)+" Encoding = " +
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Twine(DecodeDWARFEncoding(Val)));
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else
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OutStreamer.AddComment(Twine("Encoding = ") +
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DecodeDWARFEncoding(Val));
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}
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OutStreamer.EmitIntValue(Val, 1);
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}
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/// GetSizeOfEncodedValue - Return the size of the encoding in bytes.
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unsigned AsmPrinter::GetSizeOfEncodedValue(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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default: llvm_unreachable("Invalid encoded value.");
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case dwarf::DW_EH_PE_absptr: return TM.getDataLayout()->getPointerSize();
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case dwarf::DW_EH_PE_udata2: return 2;
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case dwarf::DW_EH_PE_udata4: return 4;
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case dwarf::DW_EH_PE_udata8: return 8;
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}
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}
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void AsmPrinter::EmitTTypeReference(const GlobalValue *GV,
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unsigned Encoding) const {
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if (GV) {
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const TargetLoweringObjectFile &TLOF = getObjFileLowering();
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const MCExpr *Exp =
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TLOF.getTTypeGlobalReference(GV, Mang, MMI, Encoding, OutStreamer);
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OutStreamer.EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
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} else
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OutStreamer.EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
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}
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/// EmitSectionOffset - Emit the 4-byte offset of Label from the start of its
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/// section. This can be done with a special directive if the target supports
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/// it (e.g. cygwin) or by emitting it as an offset from a label at the start
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/// of the section.
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///
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/// SectionLabel is a temporary label emitted at the start of the section that
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/// Label lives in.
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void AsmPrinter::EmitSectionOffset(const MCSymbol *Label,
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const MCSymbol *SectionLabel) const {
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// On COFF targets, we have to emit the special .secrel32 directive.
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if (MAI->getDwarfSectionOffsetDirective()) {
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OutStreamer.EmitCOFFSecRel32(Label);
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return;
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}
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// Get the section that we're referring to, based on SectionLabel.
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const MCSection &Section = SectionLabel->getSection();
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// If Label has already been emitted, verify that it is in the same section as
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// section label for sanity.
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assert((!Label->isInSection() || &Label->getSection() == &Section) &&
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"Section offset using wrong section base for label");
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// If the section in question will end up with an address of 0 anyway, we can
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// just emit an absolute reference to save a relocation.
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if (Section.isBaseAddressKnownZero()) {
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OutStreamer.EmitSymbolValue(Label, 4);
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return;
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}
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// Otherwise, emit it as a label difference from the start of the section.
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EmitLabelDifference(Label, SectionLabel, 4);
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}
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//===----------------------------------------------------------------------===//
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// Dwarf Lowering Routines
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//===----------------------------------------------------------------------===//
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/// EmitCFIFrameMove - Emit a frame instruction.
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void AsmPrinter::EmitCFIFrameMove(const MachineMove &Move) const {
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const TargetRegisterInfo *RI = TM.getRegisterInfo();
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const MachineLocation &Dst = Move.getDestination();
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const MachineLocation &Src = Move.getSource();
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// If advancing cfa.
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if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
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if (Src.getReg() == MachineLocation::VirtualFP) {
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OutStreamer.EmitCFIDefCfaOffset(-Src.getOffset());
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} else {
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// Reg + Offset
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OutStreamer.EmitCFIDefCfa(RI->getDwarfRegNum(Src.getReg(), true),
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Src.getOffset());
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}
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} else if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) {
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assert(Dst.isReg() && "Machine move not supported yet.");
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OutStreamer.EmitCFIDefCfaRegister(RI->getDwarfRegNum(Dst.getReg(), true));
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} else {
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assert(!Dst.isReg() && "Machine move not supported yet.");
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OutStreamer.EmitCFIOffset(RI->getDwarfRegNum(Src.getReg(), true),
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Dst.getOffset());
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}
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}
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