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98cdab53c3
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98124 91177308-0d34-0410-b5e6-96231b3b80d8
308 lines
11 KiB
C++
308 lines
11 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/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(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T)
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: O(OS), Asm(A), MAI(T), 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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/// getDWLabel - Return the MCSymbol corresponding to the assembler temporary
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/// label with the specified stem and unique ID.
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MCSymbol *DwarfPrinter::getDWLabel(const char *Name, unsigned ID) const {
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// FIXME: REMOVE this. However, there is stuff in EH that passes counters in
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// here that can be zero.
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//assert(ID && "Should use getTempLabel if no ID");
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if (ID == 0) return getTempLabel(Name);
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return Asm->OutContext.GetOrCreateTemporarySymbol
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(Twine(MAI->getPrivateGlobalPrefix()) + Twine(Name) + Twine(ID));
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}
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/// getTempLabel - Return the MCSymbol corresponding to the assembler temporary
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/// label with the specified name.
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MCSymbol *DwarfPrinter::getTempLabel(const char *Name) const {
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return Asm->OutContext.GetOrCreateTemporarySymbol
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(Twine(MAI->getPrivateGlobalPrefix()) + Name);
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}
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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->VerboseAsm) {
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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->VerboseAsm) {
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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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/// EmitSLEB128 - emit the specified signed leb128 value.
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void DwarfPrinter::EmitSLEB128(int Value, const char *Desc) const {
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if (Asm->VerboseAsm && Desc)
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Asm->OutStreamer.AddComment(Desc);
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if (MAI->hasLEB128()) {
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// FIXME: MCize.
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O << "\t.sleb128\t" << Value;
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Asm->OutStreamer.AddBlankLine();
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return;
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}
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// If we don't have .sleb128, emit as .bytes.
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int Sign = Value >> (8 * sizeof(Value) - 1);
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bool IsMore;
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do {
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unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
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Value >>= 7;
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IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
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if (IsMore) Byte |= 0x80;
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Asm->OutStreamer.EmitIntValue(Byte, 1, /*addrspace*/0);
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} while (IsMore);
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}
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/// EmitULEB128 - emit the specified signed leb128 value.
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void DwarfPrinter::EmitULEB128(unsigned Value, const char *Desc,
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unsigned PadTo) const {
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if (Asm->VerboseAsm && Desc)
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Asm->OutStreamer.AddComment(Desc);
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if (MAI->hasLEB128() && PadTo == 0) {
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// FIXME: MCize.
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O << "\t.uleb128\t" << Value;
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Asm->OutStreamer.AddBlankLine();
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return;
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}
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// If we don't have .uleb128 or we want to emit padding, emit as .bytes.
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do {
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unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
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Value >>= 7;
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if (Value || PadTo != 0) Byte |= 0x80;
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Asm->OutStreamer.EmitIntValue(Byte, 1, /*addrspace*/0);
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} while (Value);
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if (PadTo) {
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if (PadTo > 1)
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Asm->OutStreamer.EmitFill(PadTo - 1, 0x80/*fillval*/, 0/*addrspace*/);
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Asm->OutStreamer.EmitFill(1, 0/*fillval*/, 0/*addrspace*/);
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}
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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.getSymbolForDwarfReference(Sym, Asm->MMI, Encoding);
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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.getSymbolForDwarfGlobalReference(GV, Asm->Mang, Asm->MMI, Encoding);
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Asm->OutStreamer.EmitValue(Exp, SizeOfEncodedValue(Encoding), /*addrspace*/0);
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}
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/// EmitDifference - Emit the difference between two labels. If this assembler
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/// supports .set, we emit a .set of a temporary and then use it in the .word.
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void DwarfPrinter::EmitDifference(const MCSymbol *TagHi, const MCSymbol *TagLo,
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bool IsSmall) {
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unsigned Size = IsSmall ? 4 : TD->getPointerSize();
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Asm->EmitLabelDifference(TagHi, TagLo, Size);
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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 EmitDifference(Label, Section, IsSmall);
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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->O << SecOffDir << 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(const char *BaseLabel, unsigned BaseLabelID,
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const std::vector<MachineMove> &Moves,
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bool isEH) {
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int stackGrowth =
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Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
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TargetFrameInfo::StackGrowsUp ?
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TD->getPointerSize() : -TD->getPointerSize();
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bool IsLocal = BaseLabel && strcmp(BaseLabel, "label") == 0;
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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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unsigned LabelID = Move.getLabelID();
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// Throw out move if the label is invalid.
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if (LabelID && MMI->isLabelDeleted(LabelID))
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continue;
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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 && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
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EmitCFAByte(dwarf::DW_CFA_advance_loc4);
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EmitDifference(getDWLabel("label", LabelID),
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getDWLabel(BaseLabel, BaseLabelID), true);
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BaseLabelID = LabelID;
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BaseLabel = "label";
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IsLocal = true;
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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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EmitULEB128(RI->getDwarfRegNum(Src.getReg(), isEH), "Register");
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}
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int Offset = -Src.getOffset();
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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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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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EmitULEB128(Reg, "Reg");
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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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EmitULEB128(Offset, "Offset");
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} else {
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EmitCFAByte(dwarf::DW_CFA_offset_extended);
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EmitULEB128(Reg, "Reg");
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EmitULEB128(Offset, "Offset");
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}
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}
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}
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}
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