119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===-- AsmPrinterDwarf.cpp - AsmPrinter Dwarf Support --------------------===// 219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// The LLVM Compiler Infrastructure 419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// This file is distributed under the University of Illinois Open Source 619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// License. See LICENSE.TXT for details. 719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 1019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// This file implements the Dwarf emissions parts of AsmPrinter. 1119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// 1219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 1319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 1419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#define DEBUG_TYPE "asm-printer" 1519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/CodeGen/AsmPrinter.h" 1619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/MC/MachineLocation.h" 1719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/MC/MCAsmInfo.h" 1819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/MC/MCSection.h" 1919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/MC/MCStreamer.h" 2019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/MC/MCSymbol.h" 2119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Target/TargetData.h" 2219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Target/TargetFrameLowering.h" 2319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Target/TargetLoweringObjectFile.h" 2419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Target/TargetMachine.h" 2519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Target/TargetRegisterInfo.h" 2619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/ADT/Twine.h" 2719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman#include "llvm/Support/Dwarf.h" 2819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanusing namespace llvm; 2919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 3019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 3119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// Dwarf Emission Helper Routines 3219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 3319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 3419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// EmitSLEB128 - emit the specified signed leb128 value. 3519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid AsmPrinter::EmitSLEB128(int Value, const char *Desc) const { 3619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (isVerbose() && Desc) 3719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.AddComment(Desc); 3819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 3919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (MAI->hasLEB128()) { 4019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitSLEB128IntValue(Value); 4119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return; 4219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 4319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 4419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // If we don't have .sleb128, emit as .bytes. 4519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman int Sign = Value >> (8 * sizeof(Value) - 1); 4619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman bool IsMore; 4719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 4819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman do { 4919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 5019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Value >>= 7; 5119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0; 5219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (IsMore) Byte |= 0x80; 5319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitIntValue(Byte, 1, /*addrspace*/0); 5419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } while (IsMore); 5519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 5619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 5719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// EmitULEB128 - emit the specified signed leb128 value. 5819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid AsmPrinter::EmitULEB128(unsigned Value, const char *Desc, 5919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned PadTo) const { 6019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (isVerbose() && Desc) 6119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.AddComment(Desc); 6219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 6319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // FIXME: Should we add a PadTo option to the streamer? 6419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (MAI->hasLEB128() && PadTo == 0) { 6519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitULEB128IntValue(Value); 6619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return; 6719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 6819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 6919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // If we don't have .uleb128 or we want to emit padding, emit as .bytes. 7019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman do { 7119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 7219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Value >>= 7; 7319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (Value || PadTo != 0) Byte |= 0x80; 7419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitIntValue(Byte, 1, /*addrspace*/0); 7519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } while (Value); 7619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 7719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (PadTo) { 7819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (PadTo > 1) 7919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitFill(PadTo - 1, 0x80/*fillval*/, 0/*addrspace*/); 8019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitFill(1, 0/*fillval*/, 0/*addrspace*/); 8119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 8219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 8319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 8419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value. 8519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid AsmPrinter::EmitCFAByte(unsigned Val) const { 8619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (isVerbose()) { 8719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset+64) 8819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.AddComment("DW_CFA_offset + Reg (" + 8919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Twine(Val-dwarf::DW_CFA_offset) + ")"); 9019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman else 9119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.AddComment(dwarf::CallFrameString(Val)); 9219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 9319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitIntValue(Val, 1, 0/*addrspace*/); 9419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 9519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 9619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanstatic const char *DecodeDWARFEncoding(unsigned Encoding) { 9719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman switch (Encoding) { 9819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_absptr: return "absptr"; 9919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_omit: return "omit"; 10019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_pcrel: return "pcrel"; 10119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_udata4: return "udata4"; 10219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_udata8: return "udata8"; 10319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_sdata4: return "sdata4"; 10419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_sdata8: return "sdata8"; 10519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4: return "pcrel udata4"; 10619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4: return "pcrel sdata4"; 10719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8: return "pcrel udata8"; 10819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8: return "pcrel sdata8"; 10919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4: 11019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return "indirect pcrel udata4"; 11119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4: 11219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return "indirect pcrel sdata4"; 11319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8: 11419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return "indirect pcrel udata8"; 11519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8: 11619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return "indirect pcrel sdata8"; 11719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 11819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 11919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return "<unknown encoding>"; 12019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 12119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 12219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 12319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an 12419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// encoding. If verbose assembly output is enabled, we output comments 12519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// describing the encoding. Desc is an optional string saying what the 12619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// encoding is specifying (e.g. "LSDA"). 12719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const { 12819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (isVerbose()) { 12919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (Desc != 0) 13019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.AddComment(Twine(Desc)+" Encoding = " + 13119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Twine(DecodeDWARFEncoding(Val))); 13219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman else 13319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.AddComment(Twine("Encoding = ") + 13419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman DecodeDWARFEncoding(Val)); 13519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 13619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 13719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitIntValue(Val, 1, 0/*addrspace*/); 13819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 13919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 14019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// GetSizeOfEncodedValue - Return the size of the encoding in bytes. 14119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanunsigned AsmPrinter::GetSizeOfEncodedValue(unsigned Encoding) const { 14219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (Encoding == dwarf::DW_EH_PE_omit) 14319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return 0; 14419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 14519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman switch (Encoding & 0x07) { 14619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman default: assert(0 && "Invalid encoded value."); 14719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_absptr: return TM.getTargetData()->getPointerSize(); 14819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_udata2: return 2; 14919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_udata4: return 4; 15019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman case dwarf::DW_EH_PE_udata8: return 8; 15119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 15219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 15319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 15419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid AsmPrinter::EmitReference(const MCSymbol *Sym, unsigned Encoding) const { 15519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const TargetLoweringObjectFile &TLOF = getObjFileLowering(); 15619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 15719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const MCExpr *Exp = 15819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman TLOF.getExprForDwarfReference(Sym, Encoding, OutStreamer); 15919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitAbsValue(Exp, GetSizeOfEncodedValue(Encoding)); 16019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 16119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 16219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid AsmPrinter::EmitReference(const GlobalValue *GV, unsigned Encoding)const{ 16319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const TargetLoweringObjectFile &TLOF = getObjFileLowering(); 16419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 16519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const MCExpr *Exp = 16619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman TLOF.getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, OutStreamer); 16719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitValue(Exp, GetSizeOfEncodedValue(Encoding), /*addrspace*/0); 16819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 16919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 17019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// EmitSectionOffset - Emit the 4-byte offset of Label from the start of its 17119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// section. This can be done with a special directive if the target supports 17219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// it (e.g. cygwin) or by emitting it as an offset from a label at the start 17319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// of the section. 17419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// 17519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// SectionLabel is a temporary label emitted at the start of the section that 17619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// Label lives in. 17719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid AsmPrinter::EmitSectionOffset(const MCSymbol *Label, 17819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const MCSymbol *SectionLabel) const { 17919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // On COFF targets, we have to emit the special .secrel32 directive. 18019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (const char *SecOffDir = MAI->getDwarfSectionOffsetDirective()) { 18119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // FIXME: MCize. 18219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitRawText(SecOffDir + Twine(Label->getName())); 18319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return; 18419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 18519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 18619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Get the section that we're referring to, based on SectionLabel. 18719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const MCSection &Section = SectionLabel->getSection(); 18819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 18919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // If Label has already been emitted, verify that it is in the same section as 19019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // section label for sanity. 19119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman assert((!Label->isInSection() || &Label->getSection() == &Section) && 19219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman "Section offset using wrong section base for label"); 19319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 19419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // If the section in question will end up with an address of 0 anyway, we can 19519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // just emit an absolute reference to save a relocation. 19619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (Section.isBaseAddressKnownZero()) { 19719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitSymbolValue(Label, 4, 0/*AddrSpace*/); 19819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman return; 19919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 20019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 20119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Otherwise, emit it as a label difference from the start of the section. 20219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman EmitLabelDifference(Label, SectionLabel, 4); 20319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 20419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 20519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 20619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman// Dwarf Lowering Routines 20719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman//===----------------------------------------------------------------------===// 20819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 20919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman/// EmitCFIFrameMove - Emit a frame instruction. 21019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Baumanvoid AsmPrinter::EmitCFIFrameMove(const MachineMove &Move) const { 21119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const TargetRegisterInfo *RI = TM.getRegisterInfo(); 21219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 21319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const MachineLocation &Dst = Move.getDestination(); 21419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman const MachineLocation &Src = Move.getSource(); 21519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman 21619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // If advancing cfa. 21719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) { 21819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman if (Src.getReg() == MachineLocation::VirtualFP) { 21919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitCFIDefCfaOffset(-Src.getOffset()); 22019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } else { 22119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman // Reg + Offset 22219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitCFIDefCfa(RI->getDwarfRegNum(Src.getReg(), true), 22319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Src.getOffset()); 22419bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 22519bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } else if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) { 22619bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman assert(Dst.isReg() && "Machine move not supported yet."); 22719bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitCFIDefCfaRegister(RI->getDwarfRegNum(Dst.getReg(), true)); 22819bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } else { 22919bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman assert(!Dst.isReg() && "Machine move not supported yet."); 23019bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman OutStreamer.EmitCFIOffset(RI->getDwarfRegNum(Src.getReg(), true), 23119bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman Dst.getOffset()); 23219bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman } 23319bac1e08be200c31efd26f0f5fd144c9b3eefd3John Bauman} 234