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https://github.com/c64scene-ar/llvm-6502.git
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ca6190b108
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100349 91177308-0d34-0410-b5e6-96231b3b80d8
129 lines
4.5 KiB
C++
129 lines
4.5 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/MC/MCAsmInfo.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/Dwarf.h"
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using namespace llvm;
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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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if (MAI->hasLEB128()) {
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// FIXME: MCize.
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OutStreamer.EmitRawText("\t.sleb128\t" + Twine(Value));
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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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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 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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if (MAI->hasLEB128() && PadTo == 0) {
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// FIXME: MCize.
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OutStreamer.EmitRawText("\t.uleb128\t" + Twine(Value));
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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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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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OutStreamer.EmitFill(PadTo - 1, 0x80/*fillval*/, 0/*addrspace*/);
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OutStreamer.EmitFill(1, 0/*fillval*/, 0/*addrspace*/);
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}
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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, 0/*addrspace*/);
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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) {
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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, 0/*addrspace*/);
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}
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