MCStreamer.cpp revision 218893
1195098Sed//===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===// 2195098Sed// 3195098Sed// The LLVM Compiler Infrastructure 4195098Sed// 5195098Sed// This file is distributed under the University of Illinois Open Source 6195098Sed// License. See LICENSE.TXT for details. 7195098Sed// 8195098Sed//===----------------------------------------------------------------------===// 9195098Sed 10218893Sdim#include "llvm/MC/MCAsmInfo.h" 11218893Sdim#include "llvm/MC/MCContext.h" 12195098Sed#include "llvm/MC/MCStreamer.h" 13202878Srdivacky#include "llvm/MC/MCExpr.h" 14218893Sdim#include "llvm/MC/MCObjectWriter.h" 15218893Sdim#include "llvm/Support/ErrorHandling.h" 16202878Srdivacky#include "llvm/Support/raw_ostream.h" 17206274Srdivacky#include "llvm/ADT/SmallString.h" 18206274Srdivacky#include "llvm/ADT/Twine.h" 19206274Srdivacky#include <cstdlib> 20195098Sedusing namespace llvm; 21195098Sed 22218893SdimMCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx) { 23218893Sdim PrevSectionStack.push_back(NULL); 24218893Sdim CurSectionStack.push_back(NULL); 25195098Sed} 26195098Sed 27195098SedMCStreamer::~MCStreamer() { 28195098Sed} 29202878Srdivacky 30202878Srdivackyraw_ostream &MCStreamer::GetCommentOS() { 31202878Srdivacky // By default, discard comments. 32202878Srdivacky return nulls(); 33202878Srdivacky} 34202878Srdivacky 35218893Sdimvoid MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta, 36218893Sdim const MCSymbol *Label, int PointerSize) { 37218893Sdim // emit the sequence to set the address 38218893Sdim EmitIntValue(dwarf::DW_LNS_extended_op, 1); 39218893Sdim EmitULEB128IntValue(PointerSize + 1); 40218893Sdim EmitIntValue(dwarf::DW_LNE_set_address, 1); 41218893Sdim EmitSymbolValue(Label, PointerSize); 42202878Srdivacky 43218893Sdim // emit the sequence for the LineDelta (from 1) and a zero address delta. 44218893Sdim MCDwarfLineAddr::Emit(this, LineDelta, 0); 45218893Sdim} 46218893Sdim 47202878Srdivacky/// EmitIntValue - Special case of EmitValue that avoids the client having to 48202878Srdivacky/// pass in a MCExpr for constant integers. 49202878Srdivackyvoid MCStreamer::EmitIntValue(uint64_t Value, unsigned Size, 50202878Srdivacky unsigned AddrSpace) { 51218893Sdim assert(Size <= 8 && "Invalid size"); 52218893Sdim assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) && 53218893Sdim "Invalid size"); 54218893Sdim char buf[8]; 55218893Sdim // FIXME: Endianness assumption. 56218893Sdim for (unsigned i = 0; i != Size; ++i) 57218893Sdim buf[i] = uint8_t(Value >> (i * 8)); 58218893Sdim EmitBytes(StringRef(buf, Size), AddrSpace); 59202878Srdivacky} 60202878Srdivacky 61218893Sdim/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the 62218893Sdim/// client having to pass in a MCExpr for constant integers. 63218893Sdimvoid MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) { 64218893Sdim SmallString<32> Tmp; 65218893Sdim raw_svector_ostream OSE(Tmp); 66218893Sdim MCObjectWriter::EncodeULEB128(Value, OSE); 67218893Sdim EmitBytes(OSE.str(), AddrSpace); 68218893Sdim} 69218893Sdim 70218893Sdim/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the 71218893Sdim/// client having to pass in a MCExpr for constant integers. 72218893Sdimvoid MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) { 73218893Sdim SmallString<32> Tmp; 74218893Sdim raw_svector_ostream OSE(Tmp); 75218893Sdim MCObjectWriter::EncodeSLEB128(Value, OSE); 76218893Sdim EmitBytes(OSE.str(), AddrSpace); 77218893Sdim} 78218893Sdim 79218893Sdimvoid MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size, 80218893Sdim unsigned AddrSpace) { 81218893Sdim if (getContext().getAsmInfo().hasAggressiveSymbolFolding()) { 82218893Sdim EmitValue(Value, Size, AddrSpace); 83218893Sdim return; 84218893Sdim } 85218893Sdim MCSymbol *ABS = getContext().CreateTempSymbol(); 86218893Sdim EmitAssignment(ABS, Value); 87218893Sdim EmitSymbolValue(ABS, Size, AddrSpace); 88218893Sdim} 89218893Sdim 90218893Sdim 91218893Sdimvoid MCStreamer::EmitValue(const MCExpr *Value, unsigned Size, 92218893Sdim unsigned AddrSpace) { 93218893Sdim EmitValueImpl(Value, Size, false, AddrSpace); 94218893Sdim} 95218893Sdim 96218893Sdimvoid MCStreamer::EmitPCRelValue(const MCExpr *Value, unsigned Size, 97218893Sdim unsigned AddrSpace) { 98218893Sdim EmitValueImpl(Value, Size, true, AddrSpace); 99218893Sdim} 100218893Sdim 101204961Srdivackyvoid MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 102218893Sdim bool isPCRel, unsigned AddrSpace) { 103218893Sdim EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size, isPCRel, 104218893Sdim AddrSpace); 105218893Sdim} 106218893Sdim 107218893Sdimvoid MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 108204961Srdivacky unsigned AddrSpace) { 109218893Sdim EmitSymbolValue(Sym, Size, false, AddrSpace); 110204961Srdivacky} 111204961Srdivacky 112218893Sdimvoid MCStreamer::EmitPCRelSymbolValue(const MCSymbol *Sym, unsigned Size, 113218893Sdim unsigned AddrSpace) { 114218893Sdim EmitSymbolValue(Sym, Size, true, AddrSpace); 115218893Sdim} 116218893Sdim 117218893Sdimvoid MCStreamer::EmitGPRel32Value(const MCExpr *Value) { 118218893Sdim report_fatal_error("unsupported directive in streamer"); 119218893Sdim} 120218893Sdim 121202878Srdivacky/// EmitFill - Emit NumBytes bytes worth of the value specified by 122202878Srdivacky/// FillValue. This implements directives such as '.space'. 123202878Srdivackyvoid MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue, 124202878Srdivacky unsigned AddrSpace) { 125202878Srdivacky const MCExpr *E = MCConstantExpr::Create(FillValue, getContext()); 126202878Srdivacky for (uint64_t i = 0, e = NumBytes; i != e; ++i) 127202878Srdivacky EmitValue(E, 1, AddrSpace); 128202878Srdivacky} 129206274Srdivacky 130218893Sdimbool MCStreamer::EmitDwarfFileDirective(unsigned FileNo, 131218893Sdim StringRef Filename) { 132218893Sdim return getContext().GetDwarfFile(Filename, FileNo) == 0; 133218893Sdim} 134218893Sdim 135218893Sdimvoid MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 136218893Sdim unsigned Column, unsigned Flags, 137218893Sdim unsigned Isa, 138218893Sdim unsigned Discriminator) { 139218893Sdim getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa, 140218893Sdim Discriminator); 141218893Sdim} 142218893Sdim 143218893SdimMCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() { 144218893Sdim if (FrameInfos.empty()) 145218893Sdim return NULL; 146218893Sdim return &FrameInfos.back(); 147218893Sdim} 148218893Sdim 149218893Sdimvoid MCStreamer::EnsureValidFrame() { 150218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 151218893Sdim if (!CurFrame || CurFrame->End) 152218893Sdim report_fatal_error("No open frame"); 153218893Sdim} 154218893Sdim 155218893Sdimbool MCStreamer::EmitCFIStartProc() { 156218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 157218893Sdim if (CurFrame && !CurFrame->End) { 158218893Sdim report_fatal_error("Starting a frame before finishing the previous one!"); 159218893Sdim return true; 160218893Sdim } 161218893Sdim MCDwarfFrameInfo Frame; 162218893Sdim Frame.Begin = getContext().CreateTempSymbol(); 163218893Sdim EmitLabel(Frame.Begin); 164218893Sdim FrameInfos.push_back(Frame); 165218893Sdim return false; 166218893Sdim} 167218893Sdim 168218893Sdimbool MCStreamer::EmitCFIEndProc() { 169218893Sdim EnsureValidFrame(); 170218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 171218893Sdim CurFrame->End = getContext().CreateTempSymbol(); 172218893Sdim EmitLabel(CurFrame->End); 173218893Sdim return false; 174218893Sdim} 175218893Sdim 176218893Sdimbool MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) { 177218893Sdim EnsureValidFrame(); 178218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 179218893Sdim MCSymbol *Label = getContext().CreateTempSymbol(); 180218893Sdim EmitLabel(Label); 181218893Sdim MachineLocation Dest(MachineLocation::VirtualFP); 182218893Sdim MachineLocation Source(Register, -Offset); 183218893Sdim MCCFIInstruction Instruction(Label, Dest, Source); 184218893Sdim CurFrame->Instructions.push_back(Instruction); 185218893Sdim return false; 186218893Sdim} 187218893Sdim 188218893Sdimbool MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) { 189218893Sdim EnsureValidFrame(); 190218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 191218893Sdim MCSymbol *Label = getContext().CreateTempSymbol(); 192218893Sdim EmitLabel(Label); 193218893Sdim MachineLocation Dest(MachineLocation::VirtualFP); 194218893Sdim MachineLocation Source(MachineLocation::VirtualFP, -Offset); 195218893Sdim MCCFIInstruction Instruction(Label, Dest, Source); 196218893Sdim CurFrame->Instructions.push_back(Instruction); 197218893Sdim return false; 198218893Sdim} 199218893Sdim 200218893Sdimbool MCStreamer::EmitCFIDefCfaRegister(int64_t Register) { 201218893Sdim EnsureValidFrame(); 202218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 203218893Sdim MCSymbol *Label = getContext().CreateTempSymbol(); 204218893Sdim EmitLabel(Label); 205218893Sdim MachineLocation Dest(Register); 206218893Sdim MachineLocation Source(MachineLocation::VirtualFP); 207218893Sdim MCCFIInstruction Instruction(Label, Dest, Source); 208218893Sdim CurFrame->Instructions.push_back(Instruction); 209218893Sdim return false; 210218893Sdim} 211218893Sdim 212218893Sdimbool MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) { 213218893Sdim EnsureValidFrame(); 214218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 215218893Sdim MCSymbol *Label = getContext().CreateTempSymbol(); 216218893Sdim EmitLabel(Label); 217218893Sdim MachineLocation Dest(Register, Offset); 218218893Sdim MachineLocation Source(Register, Offset); 219218893Sdim MCCFIInstruction Instruction(Label, Dest, Source); 220218893Sdim CurFrame->Instructions.push_back(Instruction); 221218893Sdim return false; 222218893Sdim} 223218893Sdim 224218893Sdimbool MCStreamer::EmitCFIPersonality(const MCSymbol *Sym, 225218893Sdim unsigned Encoding) { 226218893Sdim EnsureValidFrame(); 227218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 228218893Sdim CurFrame->Personality = Sym; 229218893Sdim CurFrame->PersonalityEncoding = Encoding; 230218893Sdim return false; 231218893Sdim} 232218893Sdim 233218893Sdimbool MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) { 234218893Sdim EnsureValidFrame(); 235218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 236218893Sdim CurFrame->Lsda = Sym; 237218893Sdim CurFrame->LsdaEncoding = Encoding; 238218893Sdim return false; 239218893Sdim} 240218893Sdim 241218893Sdimbool MCStreamer::EmitCFIRememberState() { 242218893Sdim EnsureValidFrame(); 243218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 244218893Sdim MCSymbol *Label = getContext().CreateTempSymbol(); 245218893Sdim EmitLabel(Label); 246218893Sdim MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label); 247218893Sdim CurFrame->Instructions.push_back(Instruction); 248218893Sdim return false; 249218893Sdim} 250218893Sdim 251218893Sdimbool MCStreamer::EmitCFIRestoreState() { 252218893Sdim // FIXME: Error if there is no matching cfi_remember_state. 253218893Sdim EnsureValidFrame(); 254218893Sdim MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 255218893Sdim MCSymbol *Label = getContext().CreateTempSymbol(); 256218893Sdim EmitLabel(Label); 257218893Sdim MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label); 258218893Sdim CurFrame->Instructions.push_back(Instruction); 259218893Sdim return false; 260218893Sdim} 261218893Sdim 262208599Srdivacky/// EmitRawText - If this file is backed by an assembly streamer, this dumps 263206274Srdivacky/// the specified string in the output .s file. This capability is 264206274Srdivacky/// indicated by the hasRawTextSupport() predicate. 265206274Srdivackyvoid MCStreamer::EmitRawText(StringRef String) { 266206274Srdivacky errs() << "EmitRawText called on an MCStreamer that doesn't support it, " 267206274Srdivacky " something must not be fully mc'ized\n"; 268206274Srdivacky abort(); 269206274Srdivacky} 270206274Srdivacky 271206274Srdivackyvoid MCStreamer::EmitRawText(const Twine &T) { 272206274Srdivacky SmallString<128> Str; 273206274Srdivacky T.toVector(Str); 274206274Srdivacky EmitRawText(Str.str()); 275206274Srdivacky} 276