1 //===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCAsmInfo.h"
11 #include "llvm/MC/MCContext.h"
12 #include "llvm/MC/MCStreamer.h"
13 #include "llvm/MC/MCExpr.h"
14 #include "llvm/MC/MCObjectWriter.h"
15 #include "llvm/MC/MCSymbol.h"
16 #include "llvm/Support/ErrorHandling.h"
17 #include "llvm/Support/raw_ostream.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/ADT/Twine.h"
23 MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx) {
24 const MCSection *section = NULL;
25 SectionStack.push_back(std::make_pair(section, section));
28 MCStreamer::~MCStreamer() {
31 const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
34 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
36 MCSymbolRefExpr::Create(A, Variant, Context);
38 MCSymbolRefExpr::Create(B, Variant, Context);
39 const MCExpr *AddrDelta =
40 MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
44 const MCExpr *MCStreamer::ForceExpAbs(MCStreamer *Streamer,
45 MCContext &Context, const MCExpr* Expr) {
46 if (Context.getAsmInfo().hasAggressiveSymbolFolding())
49 MCSymbol *ABS = Context.CreateTempSymbol();
50 Streamer->EmitAssignment(ABS, Expr);
51 return MCSymbolRefExpr::Create(ABS, Context);
54 raw_ostream &MCStreamer::GetCommentOS() {
55 // By default, discard comments.
59 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
60 const MCSymbol *Label, int PointerSize) {
61 // emit the sequence to set the address
62 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
63 EmitULEB128IntValue(PointerSize + 1);
64 EmitIntValue(dwarf::DW_LNE_set_address, 1);
65 EmitSymbolValue(Label, PointerSize);
67 // emit the sequence for the LineDelta (from 1) and a zero address delta.
68 MCDwarfLineAddr::Emit(this, LineDelta, 0);
71 /// EmitIntValue - Special case of EmitValue that avoids the client having to
72 /// pass in a MCExpr for constant integers.
73 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
75 assert(Size <= 8 && "Invalid size");
76 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
79 // FIXME: Endianness assumption.
80 for (unsigned i = 0; i != Size; ++i)
81 buf[i] = uint8_t(Value >> (i * 8));
82 EmitBytes(StringRef(buf, Size), AddrSpace);
85 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
86 /// client having to pass in a MCExpr for constant integers.
87 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) {
89 raw_svector_ostream OSE(Tmp);
90 MCObjectWriter::EncodeULEB128(Value, OSE);
91 EmitBytes(OSE.str(), AddrSpace);
94 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
95 /// client having to pass in a MCExpr for constant integers.
96 void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
98 raw_svector_ostream OSE(Tmp);
99 MCObjectWriter::EncodeSLEB128(Value, OSE);
100 EmitBytes(OSE.str(), AddrSpace);
103 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
104 unsigned AddrSpace) {
105 if (getContext().getAsmInfo().hasAggressiveSymbolFolding()) {
106 EmitValue(Value, Size, AddrSpace);
109 MCSymbol *ABS = getContext().CreateTempSymbol();
110 EmitAssignment(ABS, Value);
111 EmitSymbolValue(ABS, Size, AddrSpace);
115 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
116 unsigned AddrSpace) {
117 EmitValueImpl(Value, Size, false, AddrSpace);
120 void MCStreamer::EmitPCRelValue(const MCExpr *Value, unsigned Size,
121 unsigned AddrSpace) {
122 EmitValueImpl(Value, Size, true, AddrSpace);
125 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
126 bool isPCRel, unsigned AddrSpace) {
127 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size, isPCRel,
131 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
132 unsigned AddrSpace) {
133 EmitSymbolValue(Sym, Size, false, AddrSpace);
136 void MCStreamer::EmitPCRelSymbolValue(const MCSymbol *Sym, unsigned Size,
137 unsigned AddrSpace) {
138 EmitSymbolValue(Sym, Size, true, AddrSpace);
141 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
142 report_fatal_error("unsupported directive in streamer");
145 /// EmitFill - Emit NumBytes bytes worth of the value specified by
146 /// FillValue. This implements directives such as '.space'.
147 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
148 unsigned AddrSpace) {
149 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
150 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
151 EmitValue(E, 1, AddrSpace);
154 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
155 StringRef Filename) {
156 return getContext().GetDwarfFile(Filename, FileNo) == 0;
159 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
160 unsigned Column, unsigned Flags,
162 unsigned Discriminator,
163 StringRef FileName) {
164 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
168 MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
169 if (FrameInfos.empty())
171 return &FrameInfos.back();
174 void MCStreamer::EnsureValidFrame() {
175 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
176 if (!CurFrame || CurFrame->End)
177 report_fatal_error("No open frame");
180 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
181 MCSymbol *EHSymbol) {
184 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
185 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
186 assert(getCurrentSection() && "Cannot emit before setting section!");
187 Symbol->setSection(*getCurrentSection());
189 StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
190 if (!Symbol->getName().startswith(Prefix))
191 LastNonPrivate = Symbol;
194 void MCStreamer::EmitCFIStartProc() {
195 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
196 if (CurFrame && !CurFrame->End)
197 report_fatal_error("Starting a frame before finishing the previous one!");
198 MCDwarfFrameInfo Frame;
199 Frame.Begin = getContext().CreateTempSymbol();
200 Frame.Function = LastNonPrivate;
201 EmitLabel(Frame.Begin);
202 FrameInfos.push_back(Frame);
205 void MCStreamer::EmitCFIEndProc() {
207 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
208 CurFrame->End = getContext().CreateTempSymbol();
209 EmitLabel(CurFrame->End);
212 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
214 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
215 MCSymbol *Label = getContext().CreateTempSymbol();
217 MachineLocation Dest(MachineLocation::VirtualFP);
218 MachineLocation Source(Register, -Offset);
219 MCCFIInstruction Instruction(Label, Dest, Source);
220 CurFrame->Instructions.push_back(Instruction);
223 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
225 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
226 MCSymbol *Label = getContext().CreateTempSymbol();
228 MachineLocation Dest(MachineLocation::VirtualFP);
229 MachineLocation Source(MachineLocation::VirtualFP, -Offset);
230 MCCFIInstruction Instruction(Label, Dest, Source);
231 CurFrame->Instructions.push_back(Instruction);
234 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
236 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
237 MCSymbol *Label = getContext().CreateTempSymbol();
239 MachineLocation Dest(MachineLocation::VirtualFP);
240 MachineLocation Source(MachineLocation::VirtualFP, Adjustment);
241 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
242 CurFrame->Instructions.push_back(Instruction);
245 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
247 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
248 MCSymbol *Label = getContext().CreateTempSymbol();
250 MachineLocation Dest(Register);
251 MachineLocation Source(MachineLocation::VirtualFP);
252 MCCFIInstruction Instruction(Label, Dest, Source);
253 CurFrame->Instructions.push_back(Instruction);
256 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
258 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
259 MCSymbol *Label = getContext().CreateTempSymbol();
261 MachineLocation Dest(Register, Offset);
262 MachineLocation Source(Register, Offset);
263 MCCFIInstruction Instruction(Label, Dest, Source);
264 CurFrame->Instructions.push_back(Instruction);
267 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
269 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
270 MCSymbol *Label = getContext().CreateTempSymbol();
272 MachineLocation Dest(Register, Offset);
273 MachineLocation Source(Register, Offset);
274 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
275 CurFrame->Instructions.push_back(Instruction);
278 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
281 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
282 CurFrame->Personality = Sym;
283 CurFrame->PersonalityEncoding = Encoding;
286 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
288 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
289 CurFrame->Lsda = Sym;
290 CurFrame->LsdaEncoding = Encoding;
293 void MCStreamer::EmitCFIRememberState() {
295 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
296 MCSymbol *Label = getContext().CreateTempSymbol();
298 MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label);
299 CurFrame->Instructions.push_back(Instruction);
302 void MCStreamer::EmitCFIRestoreState() {
303 // FIXME: Error if there is no matching cfi_remember_state.
305 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
306 MCSymbol *Label = getContext().CreateTempSymbol();
308 MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label);
309 CurFrame->Instructions.push_back(Instruction);
312 void MCStreamer::EmitCFISameValue(int64_t Register) {
314 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
315 MCSymbol *Label = getContext().CreateTempSymbol();
317 MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register);
318 CurFrame->Instructions.push_back(Instruction);
321 void MCStreamer::EmitFnStart() {
322 errs() << "Not implemented yet\n";
326 void MCStreamer::EmitFnEnd() {
327 errs() << "Not implemented yet\n";
331 void MCStreamer::EmitCantUnwind() {
332 errs() << "Not implemented yet\n";
336 void MCStreamer::EmitHandlerData() {
337 errs() << "Not implemented yet\n";
341 void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
342 errs() << "Not implemented yet\n";
346 void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
347 errs() << "Not implemented yet\n";
351 void MCStreamer::EmitPad(int64_t Offset) {
352 errs() << "Not implemented yet\n";
356 void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
357 errs() << "Not implemented yet\n";
361 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
362 /// the specified string in the output .s file. This capability is
363 /// indicated by the hasRawTextSupport() predicate.
364 void MCStreamer::EmitRawText(StringRef String) {
365 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
366 " something must not be fully mc'ized\n";
370 void MCStreamer::EmitRawText(const Twine &T) {
371 SmallString<128> Str;
373 EmitRawText(Str.str());