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), EmitEHFrame(true),
24 EmitDebugFrame(false) {
25 const MCSection *section = NULL;
26 SectionStack.push_back(std::make_pair(section, section));
29 MCStreamer::~MCStreamer() {
32 const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
35 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
37 MCSymbolRefExpr::Create(A, Variant, Context);
39 MCSymbolRefExpr::Create(B, Variant, Context);
40 const MCExpr *AddrDelta =
41 MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
45 const MCExpr *MCStreamer::ForceExpAbs(MCStreamer *Streamer,
46 MCContext &Context, const MCExpr* Expr) {
47 if (Context.getAsmInfo().hasAggressiveSymbolFolding())
50 MCSymbol *ABS = Context.CreateTempSymbol();
51 Streamer->EmitAssignment(ABS, Expr);
52 return MCSymbolRefExpr::Create(ABS, Context);
55 raw_ostream &MCStreamer::GetCommentOS() {
56 // By default, discard comments.
60 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
61 const MCSymbol *Label, int PointerSize) {
62 // emit the sequence to set the address
63 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
64 EmitULEB128IntValue(PointerSize + 1);
65 EmitIntValue(dwarf::DW_LNE_set_address, 1);
66 EmitSymbolValue(Label, PointerSize);
68 // emit the sequence for the LineDelta (from 1) and a zero address delta.
69 MCDwarfLineAddr::Emit(this, LineDelta, 0);
72 /// EmitIntValue - Special case of EmitValue that avoids the client having to
73 /// pass in a MCExpr for constant integers.
74 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
76 assert(Size <= 8 && "Invalid size");
77 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
80 // FIXME: Endianness assumption.
81 for (unsigned i = 0; i != Size; ++i)
82 buf[i] = uint8_t(Value >> (i * 8));
83 EmitBytes(StringRef(buf, Size), AddrSpace);
86 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
87 /// client having to pass in a MCExpr for constant integers.
88 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) {
90 raw_svector_ostream OSE(Tmp);
91 MCObjectWriter::EncodeULEB128(Value, OSE);
92 EmitBytes(OSE.str(), AddrSpace);
95 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
96 /// client having to pass in a MCExpr for constant integers.
97 void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
99 raw_svector_ostream OSE(Tmp);
100 MCObjectWriter::EncodeSLEB128(Value, OSE);
101 EmitBytes(OSE.str(), AddrSpace);
104 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
105 unsigned AddrSpace) {
106 if (getContext().getAsmInfo().hasAggressiveSymbolFolding()) {
107 EmitValue(Value, Size, AddrSpace);
110 MCSymbol *ABS = getContext().CreateTempSymbol();
111 EmitAssignment(ABS, Value);
112 EmitSymbolValue(ABS, Size, AddrSpace);
116 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
117 unsigned AddrSpace) {
118 EmitValueImpl(Value, Size, AddrSpace);
121 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
122 unsigned AddrSpace) {
123 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size,
127 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
128 report_fatal_error("unsupported directive in streamer");
131 /// EmitFill - Emit NumBytes bytes worth of the value specified by
132 /// FillValue. This implements directives such as '.space'.
133 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
134 unsigned AddrSpace) {
135 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
136 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
137 EmitValue(E, 1, AddrSpace);
140 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
141 StringRef Filename) {
142 return getContext().GetDwarfFile(Filename, FileNo) == 0;
145 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
146 unsigned Column, unsigned Flags,
148 unsigned Discriminator,
149 StringRef FileName) {
150 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
154 MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
155 if (FrameInfos.empty())
157 return &FrameInfos.back();
160 void MCStreamer::EnsureValidFrame() {
161 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
162 if (!CurFrame || CurFrame->End)
163 report_fatal_error("No open frame");
166 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
167 MCSymbol *EHSymbol) {
170 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
171 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
172 assert(getCurrentSection() && "Cannot emit before setting section!");
173 Symbol->setSection(*getCurrentSection());
175 StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
176 if (!Symbol->getName().startswith(Prefix))
177 LastNonPrivate = Symbol;
180 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
182 EmitDebugFrame = Debug;
185 void MCStreamer::EmitCFIStartProc() {
186 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
187 if (CurFrame && !CurFrame->End)
188 report_fatal_error("Starting a frame before finishing the previous one!");
189 MCDwarfFrameInfo Frame;
190 Frame.Begin = getContext().CreateTempSymbol();
191 Frame.Function = LastNonPrivate;
192 EmitLabel(Frame.Begin);
193 FrameInfos.push_back(Frame);
196 void MCStreamer::EmitCFIEndProc() {
198 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
199 CurFrame->End = getContext().CreateTempSymbol();
200 EmitLabel(CurFrame->End);
203 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
205 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
206 MCSymbol *Label = getContext().CreateTempSymbol();
208 MachineLocation Dest(MachineLocation::VirtualFP);
209 MachineLocation Source(Register, -Offset);
210 MCCFIInstruction Instruction(Label, Dest, Source);
211 CurFrame->Instructions.push_back(Instruction);
214 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
216 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
217 MCSymbol *Label = getContext().CreateTempSymbol();
219 MachineLocation Dest(MachineLocation::VirtualFP);
220 MachineLocation Source(MachineLocation::VirtualFP, -Offset);
221 MCCFIInstruction Instruction(Label, Dest, Source);
222 CurFrame->Instructions.push_back(Instruction);
225 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
227 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
228 MCSymbol *Label = getContext().CreateTempSymbol();
230 MachineLocation Dest(MachineLocation::VirtualFP);
231 MachineLocation Source(MachineLocation::VirtualFP, Adjustment);
232 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
233 CurFrame->Instructions.push_back(Instruction);
236 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
238 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
239 MCSymbol *Label = getContext().CreateTempSymbol();
241 MachineLocation Dest(Register);
242 MachineLocation Source(MachineLocation::VirtualFP);
243 MCCFIInstruction Instruction(Label, Dest, Source);
244 CurFrame->Instructions.push_back(Instruction);
247 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
249 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
250 MCSymbol *Label = getContext().CreateTempSymbol();
252 MachineLocation Dest(Register, Offset);
253 MachineLocation Source(Register, Offset);
254 MCCFIInstruction Instruction(Label, Dest, Source);
255 CurFrame->Instructions.push_back(Instruction);
258 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
260 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
261 MCSymbol *Label = getContext().CreateTempSymbol();
263 MachineLocation Dest(Register, Offset);
264 MachineLocation Source(Register, Offset);
265 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
266 CurFrame->Instructions.push_back(Instruction);
269 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
272 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
273 CurFrame->Personality = Sym;
274 CurFrame->PersonalityEncoding = Encoding;
277 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
279 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
280 CurFrame->Lsda = Sym;
281 CurFrame->LsdaEncoding = Encoding;
284 void MCStreamer::EmitCFIRememberState() {
286 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
287 MCSymbol *Label = getContext().CreateTempSymbol();
289 MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label);
290 CurFrame->Instructions.push_back(Instruction);
293 void MCStreamer::EmitCFIRestoreState() {
294 // FIXME: Error if there is no matching cfi_remember_state.
296 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
297 MCSymbol *Label = getContext().CreateTempSymbol();
299 MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label);
300 CurFrame->Instructions.push_back(Instruction);
303 void MCStreamer::EmitCFISameValue(int64_t Register) {
305 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
306 MCSymbol *Label = getContext().CreateTempSymbol();
308 MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register);
309 CurFrame->Instructions.push_back(Instruction);
312 void MCStreamer::EmitFnStart() {
313 errs() << "Not implemented yet\n";
317 void MCStreamer::EmitFnEnd() {
318 errs() << "Not implemented yet\n";
322 void MCStreamer::EmitCantUnwind() {
323 errs() << "Not implemented yet\n";
327 void MCStreamer::EmitHandlerData() {
328 errs() << "Not implemented yet\n";
332 void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
333 errs() << "Not implemented yet\n";
337 void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
338 errs() << "Not implemented yet\n";
342 void MCStreamer::EmitPad(int64_t Offset) {
343 errs() << "Not implemented yet\n";
347 void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
348 errs() << "Not implemented yet\n";
352 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
353 /// the specified string in the output .s file. This capability is
354 /// indicated by the hasRawTextSupport() predicate.
355 void MCStreamer::EmitRawText(StringRef String) {
356 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
357 " something must not be fully mc'ized\n";
361 void MCStreamer::EmitRawText(const Twine &T) {
362 SmallString<128> Str;
364 EmitRawText(Str.str());