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, AddrSpace);
120 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
121 unsigned AddrSpace) {
122 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size,
126 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
127 report_fatal_error("unsupported directive in streamer");
130 /// EmitFill - Emit NumBytes bytes worth of the value specified by
131 /// FillValue. This implements directives such as '.space'.
132 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
133 unsigned AddrSpace) {
134 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
135 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
136 EmitValue(E, 1, AddrSpace);
139 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
140 StringRef Filename) {
141 return getContext().GetDwarfFile(Filename, FileNo) == 0;
144 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
145 unsigned Column, unsigned Flags,
147 unsigned Discriminator,
148 StringRef FileName) {
149 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
153 MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
154 if (FrameInfos.empty())
156 return &FrameInfos.back();
159 void MCStreamer::EnsureValidFrame() {
160 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
161 if (!CurFrame || CurFrame->End)
162 report_fatal_error("No open frame");
165 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
166 MCSymbol *EHSymbol) {
169 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
170 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
171 assert(getCurrentSection() && "Cannot emit before setting section!");
172 Symbol->setSection(*getCurrentSection());
174 StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
175 if (!Symbol->getName().startswith(Prefix))
176 LastNonPrivate = Symbol;
179 void MCStreamer::EmitCFIStartProc() {
180 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
181 if (CurFrame && !CurFrame->End)
182 report_fatal_error("Starting a frame before finishing the previous one!");
183 MCDwarfFrameInfo Frame;
184 Frame.Begin = getContext().CreateTempSymbol();
185 Frame.Function = LastNonPrivate;
186 EmitLabel(Frame.Begin);
187 FrameInfos.push_back(Frame);
190 void MCStreamer::EmitCFIEndProc() {
192 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
193 CurFrame->End = getContext().CreateTempSymbol();
194 EmitLabel(CurFrame->End);
197 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
199 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
200 MCSymbol *Label = getContext().CreateTempSymbol();
202 MachineLocation Dest(MachineLocation::VirtualFP);
203 MachineLocation Source(Register, -Offset);
204 MCCFIInstruction Instruction(Label, Dest, Source);
205 CurFrame->Instructions.push_back(Instruction);
208 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
210 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
211 MCSymbol *Label = getContext().CreateTempSymbol();
213 MachineLocation Dest(MachineLocation::VirtualFP);
214 MachineLocation Source(MachineLocation::VirtualFP, -Offset);
215 MCCFIInstruction Instruction(Label, Dest, Source);
216 CurFrame->Instructions.push_back(Instruction);
219 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
221 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
222 MCSymbol *Label = getContext().CreateTempSymbol();
224 MachineLocation Dest(MachineLocation::VirtualFP);
225 MachineLocation Source(MachineLocation::VirtualFP, Adjustment);
226 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
227 CurFrame->Instructions.push_back(Instruction);
230 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
232 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
233 MCSymbol *Label = getContext().CreateTempSymbol();
235 MachineLocation Dest(Register);
236 MachineLocation Source(MachineLocation::VirtualFP);
237 MCCFIInstruction Instruction(Label, Dest, Source);
238 CurFrame->Instructions.push_back(Instruction);
241 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
243 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
244 MCSymbol *Label = getContext().CreateTempSymbol();
246 MachineLocation Dest(Register, Offset);
247 MachineLocation Source(Register, Offset);
248 MCCFIInstruction Instruction(Label, Dest, Source);
249 CurFrame->Instructions.push_back(Instruction);
252 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
254 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
255 MCSymbol *Label = getContext().CreateTempSymbol();
257 MachineLocation Dest(Register, Offset);
258 MachineLocation Source(Register, Offset);
259 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
260 CurFrame->Instructions.push_back(Instruction);
263 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
266 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
267 CurFrame->Personality = Sym;
268 CurFrame->PersonalityEncoding = Encoding;
271 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
273 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
274 CurFrame->Lsda = Sym;
275 CurFrame->LsdaEncoding = Encoding;
278 void MCStreamer::EmitCFIRememberState() {
280 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
281 MCSymbol *Label = getContext().CreateTempSymbol();
283 MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label);
284 CurFrame->Instructions.push_back(Instruction);
287 void MCStreamer::EmitCFIRestoreState() {
288 // FIXME: Error if there is no matching cfi_remember_state.
290 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
291 MCSymbol *Label = getContext().CreateTempSymbol();
293 MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label);
294 CurFrame->Instructions.push_back(Instruction);
297 void MCStreamer::EmitCFISameValue(int64_t Register) {
299 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
300 MCSymbol *Label = getContext().CreateTempSymbol();
302 MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register);
303 CurFrame->Instructions.push_back(Instruction);
306 void MCStreamer::EmitFnStart() {
307 errs() << "Not implemented yet\n";
311 void MCStreamer::EmitFnEnd() {
312 errs() << "Not implemented yet\n";
316 void MCStreamer::EmitCantUnwind() {
317 errs() << "Not implemented yet\n";
321 void MCStreamer::EmitHandlerData() {
322 errs() << "Not implemented yet\n";
326 void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
327 errs() << "Not implemented yet\n";
331 void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
332 errs() << "Not implemented yet\n";
336 void MCStreamer::EmitPad(int64_t Offset) {
337 errs() << "Not implemented yet\n";
341 void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
342 errs() << "Not implemented yet\n";
346 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
347 /// the specified string in the output .s file. This capability is
348 /// indicated by the hasRawTextSupport() predicate.
349 void MCStreamer::EmitRawText(StringRef String) {
350 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
351 " something must not be fully mc'ized\n";
355 void MCStreamer::EmitRawText(const Twine &T) {
356 SmallString<128> Str;
358 EmitRawText(Str.str());