1 //===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/MC/MCStreamer.h"
11 #include "llvm/ADT/SmallString.h"
12 #include "llvm/ADT/Twine.h"
13 #include "llvm/MC/MCAsmBackend.h"
14 #include "llvm/MC/MCAsmInfo.h"
15 #include "llvm/MC/MCContext.h"
16 #include "llvm/MC/MCExpr.h"
17 #include "llvm/MC/MCObjectFileInfo.h"
18 #include "llvm/MC/MCObjectWriter.h"
19 #include "llvm/MC/MCSymbol.h"
20 #include "llvm/Support/ErrorHandling.h"
21 #include "llvm/Support/LEB128.h"
22 #include "llvm/Support/raw_ostream.h"
23 #include <cstdlib>
24 using namespace llvm;
25
26 // Pin the vtables to this file.
~MCTargetStreamer()27 MCTargetStreamer::~MCTargetStreamer() {}
28
MCTargetStreamer(MCStreamer & S)29 MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {
30 S.setTargetStreamer(this);
31 }
32
emitLabel(MCSymbol * Symbol)33 void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
34
finish()35 void MCTargetStreamer::finish() {}
36
emitAssignment(MCSymbol * Symbol,const MCExpr * Value)37 void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
38
MCStreamer(MCContext & Ctx)39 MCStreamer::MCStreamer(MCContext &Ctx)
40 : Context(Ctx), CurrentW64UnwindInfo(nullptr) {
41 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
42 }
43
~MCStreamer()44 MCStreamer::~MCStreamer() {
45 for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
46 delete W64UnwindInfos[i];
47 }
48
reset()49 void MCStreamer::reset() {
50 for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
51 delete W64UnwindInfos[i];
52 W64UnwindInfos.clear();
53 CurrentW64UnwindInfo = nullptr;
54 SectionStack.clear();
55 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
56 }
57
BuildSymbolDiff(MCContext & Context,const MCSymbol * A,const MCSymbol * B)58 const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
59 const MCSymbol *A,
60 const MCSymbol *B) {
61 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
62 const MCExpr *ARef =
63 MCSymbolRefExpr::Create(A, Variant, Context);
64 const MCExpr *BRef =
65 MCSymbolRefExpr::Create(B, Variant, Context);
66 const MCExpr *AddrDelta =
67 MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
68 return AddrDelta;
69 }
70
ForceExpAbs(const MCExpr * Expr)71 const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
72 assert(!isa<MCSymbolRefExpr>(Expr));
73 if (Context.getAsmInfo()->hasAggressiveSymbolFolding())
74 return Expr;
75
76 MCSymbol *ABS = Context.CreateTempSymbol();
77 EmitAssignment(ABS, Expr);
78 return MCSymbolRefExpr::Create(ABS, Context);
79 }
80
GetCommentOS()81 raw_ostream &MCStreamer::GetCommentOS() {
82 // By default, discard comments.
83 return nulls();
84 }
85
emitRawComment(const Twine & T,bool TabPrefix)86 void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
87
generateCompactUnwindEncodings(MCAsmBackend * MAB)88 void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
89 for (std::vector<MCDwarfFrameInfo>::iterator I = FrameInfos.begin(),
90 E = FrameInfos.end(); I != E; ++I)
91 I->CompactUnwindEncoding =
92 (MAB ? MAB->generateCompactUnwindEncoding(I->Instructions) : 0);
93 }
94
EmitDwarfSetLineAddr(int64_t LineDelta,const MCSymbol * Label,int PointerSize)95 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
96 const MCSymbol *Label, int PointerSize) {
97 // emit the sequence to set the address
98 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
99 EmitULEB128IntValue(PointerSize + 1);
100 EmitIntValue(dwarf::DW_LNE_set_address, 1);
101 EmitSymbolValue(Label, PointerSize);
102
103 // emit the sequence for the LineDelta (from 1) and a zero address delta.
104 MCDwarfLineAddr::Emit(this, LineDelta, 0);
105 }
106
107 /// EmitIntValue - Special case of EmitValue that avoids the client having to
108 /// pass in a MCExpr for constant integers.
EmitIntValue(uint64_t Value,unsigned Size)109 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
110 assert(Size <= 8 && "Invalid size");
111 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
112 "Invalid size");
113 char buf[8];
114 const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
115 for (unsigned i = 0; i != Size; ++i) {
116 unsigned index = isLittleEndian ? i : (Size - i - 1);
117 buf[i] = uint8_t(Value >> (index * 8));
118 }
119 EmitBytes(StringRef(buf, Size));
120 }
121
122 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
123 /// client having to pass in a MCExpr for constant integers.
EmitULEB128IntValue(uint64_t Value,unsigned Padding)124 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
125 SmallString<128> Tmp;
126 raw_svector_ostream OSE(Tmp);
127 encodeULEB128(Value, OSE, Padding);
128 EmitBytes(OSE.str());
129 }
130
131 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
132 /// client having to pass in a MCExpr for constant integers.
EmitSLEB128IntValue(int64_t Value)133 void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
134 SmallString<128> Tmp;
135 raw_svector_ostream OSE(Tmp);
136 encodeSLEB128(Value, OSE);
137 EmitBytes(OSE.str());
138 }
139
EmitAbsValue(const MCExpr * Value,unsigned Size)140 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
141 const MCExpr *ABS = ForceExpAbs(Value);
142 EmitValue(ABS, Size);
143 }
144
145
EmitValue(const MCExpr * Value,unsigned Size,const SMLoc & Loc)146 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
147 const SMLoc &Loc) {
148 EmitValueImpl(Value, Size, Loc);
149 }
150
EmitSymbolValue(const MCSymbol * Sym,unsigned Size)151 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size) {
152 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
153 }
154
EmitGPRel64Value(const MCExpr * Value)155 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
156 report_fatal_error("unsupported directive in streamer");
157 }
158
EmitGPRel32Value(const MCExpr * Value)159 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
160 report_fatal_error("unsupported directive in streamer");
161 }
162
163 /// EmitFill - Emit NumBytes bytes worth of the value specified by
164 /// FillValue. This implements directives such as '.space'.
EmitFill(uint64_t NumBytes,uint8_t FillValue)165 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
166 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
167 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
168 EmitValue(E, 1);
169 }
170
171 /// The implementation in this class just redirects to EmitFill.
EmitZeros(uint64_t NumBytes)172 void MCStreamer::EmitZeros(uint64_t NumBytes) {
173 EmitFill(NumBytes, 0);
174 }
175
EmitDwarfFileDirective(unsigned FileNo,StringRef Directory,StringRef Filename,unsigned CUID)176 unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
177 StringRef Directory,
178 StringRef Filename, unsigned CUID) {
179 return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID);
180 }
181
EmitDwarfLocDirective(unsigned FileNo,unsigned Line,unsigned Column,unsigned Flags,unsigned Isa,unsigned Discriminator,StringRef FileName)182 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
183 unsigned Column, unsigned Flags,
184 unsigned Isa,
185 unsigned Discriminator,
186 StringRef FileName) {
187 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
188 Discriminator);
189 }
190
getDwarfLineTableSymbol(unsigned CUID)191 MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
192 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
193 if (!Table.getLabel()) {
194 StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
195 Table.setLabel(
196 Context.GetOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
197 }
198 return Table.getLabel();
199 }
200
getCurrentFrameInfo()201 MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
202 if (FrameInfos.empty())
203 return nullptr;
204 return &FrameInfos.back();
205 }
206
EnsureValidFrame()207 void MCStreamer::EnsureValidFrame() {
208 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
209 if (!CurFrame || CurFrame->End)
210 report_fatal_error("No open frame");
211 }
212
EmitEHSymAttributes(const MCSymbol * Symbol,MCSymbol * EHSymbol)213 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
214 MCSymbol *EHSymbol) {
215 }
216
InitSections()217 void MCStreamer::InitSections() {
218 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
219 }
220
AssignSection(MCSymbol * Symbol,const MCSection * Section)221 void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) {
222 if (Section)
223 Symbol->setSection(*Section);
224 else
225 Symbol->setUndefined();
226
227 // As we emit symbols into a section, track the order so that they can
228 // be sorted upon later. Zero is reserved to mean 'unemitted'.
229 SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
230 }
231
EmitLabel(MCSymbol * Symbol)232 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
233 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
234 assert(getCurrentSection().first && "Cannot emit before setting section!");
235 AssignSection(Symbol, getCurrentSection().first);
236
237 MCTargetStreamer *TS = getTargetStreamer();
238 if (TS)
239 TS->emitLabel(Symbol);
240 }
241
EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding)242 void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
243 EnsureValidFrame();
244 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
245 CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
246 }
247
EmitCFISections(bool EH,bool Debug)248 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
249 assert(EH || Debug);
250 }
251
EmitCFIStartProc(bool IsSimple)252 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
253 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
254 if (CurFrame && !CurFrame->End)
255 report_fatal_error("Starting a frame before finishing the previous one!");
256
257 MCDwarfFrameInfo Frame;
258 Frame.IsSimple = IsSimple;
259 EmitCFIStartProcImpl(Frame);
260
261 FrameInfos.push_back(Frame);
262 }
263
EmitCFIStartProcImpl(MCDwarfFrameInfo & Frame)264 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
265 }
266
EmitCFIEndProc()267 void MCStreamer::EmitCFIEndProc() {
268 EnsureValidFrame();
269 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
270 EmitCFIEndProcImpl(*CurFrame);
271 }
272
EmitCFIEndProcImpl(MCDwarfFrameInfo & Frame)273 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
274 // Put a dummy non-null value in Frame.End to mark that this frame has been
275 // closed.
276 Frame.End = (MCSymbol *) 1;
277 }
278
EmitCFICommon()279 MCSymbol *MCStreamer::EmitCFICommon() {
280 EnsureValidFrame();
281 MCSymbol *Label = getContext().CreateTempSymbol();
282 EmitLabel(Label);
283 return Label;
284 }
285
EmitCFIDefCfa(int64_t Register,int64_t Offset)286 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
287 MCSymbol *Label = EmitCFICommon();
288 MCCFIInstruction Instruction =
289 MCCFIInstruction::createDefCfa(Label, Register, Offset);
290 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
291 CurFrame->Instructions.push_back(Instruction);
292 }
293
EmitCFIDefCfaOffset(int64_t Offset)294 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
295 MCSymbol *Label = EmitCFICommon();
296 MCCFIInstruction Instruction =
297 MCCFIInstruction::createDefCfaOffset(Label, Offset);
298 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
299 CurFrame->Instructions.push_back(Instruction);
300 }
301
EmitCFIAdjustCfaOffset(int64_t Adjustment)302 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
303 MCSymbol *Label = EmitCFICommon();
304 MCCFIInstruction Instruction =
305 MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
306 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
307 CurFrame->Instructions.push_back(Instruction);
308 }
309
EmitCFIDefCfaRegister(int64_t Register)310 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
311 MCSymbol *Label = EmitCFICommon();
312 MCCFIInstruction Instruction =
313 MCCFIInstruction::createDefCfaRegister(Label, Register);
314 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
315 CurFrame->Instructions.push_back(Instruction);
316 }
317
EmitCFIOffset(int64_t Register,int64_t Offset)318 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
319 MCSymbol *Label = EmitCFICommon();
320 MCCFIInstruction Instruction =
321 MCCFIInstruction::createOffset(Label, Register, Offset);
322 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
323 CurFrame->Instructions.push_back(Instruction);
324 }
325
EmitCFIRelOffset(int64_t Register,int64_t Offset)326 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
327 MCSymbol *Label = EmitCFICommon();
328 MCCFIInstruction Instruction =
329 MCCFIInstruction::createRelOffset(Label, Register, Offset);
330 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
331 CurFrame->Instructions.push_back(Instruction);
332 }
333
EmitCFIPersonality(const MCSymbol * Sym,unsigned Encoding)334 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
335 unsigned Encoding) {
336 EnsureValidFrame();
337 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
338 CurFrame->Personality = Sym;
339 CurFrame->PersonalityEncoding = Encoding;
340 }
341
EmitCFILsda(const MCSymbol * Sym,unsigned Encoding)342 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
343 EnsureValidFrame();
344 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
345 CurFrame->Lsda = Sym;
346 CurFrame->LsdaEncoding = Encoding;
347 }
348
EmitCFIRememberState()349 void MCStreamer::EmitCFIRememberState() {
350 MCSymbol *Label = EmitCFICommon();
351 MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
352 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
353 CurFrame->Instructions.push_back(Instruction);
354 }
355
EmitCFIRestoreState()356 void MCStreamer::EmitCFIRestoreState() {
357 // FIXME: Error if there is no matching cfi_remember_state.
358 MCSymbol *Label = EmitCFICommon();
359 MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
360 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
361 CurFrame->Instructions.push_back(Instruction);
362 }
363
EmitCFISameValue(int64_t Register)364 void MCStreamer::EmitCFISameValue(int64_t Register) {
365 MCSymbol *Label = EmitCFICommon();
366 MCCFIInstruction Instruction =
367 MCCFIInstruction::createSameValue(Label, Register);
368 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
369 CurFrame->Instructions.push_back(Instruction);
370 }
371
EmitCFIRestore(int64_t Register)372 void MCStreamer::EmitCFIRestore(int64_t Register) {
373 MCSymbol *Label = EmitCFICommon();
374 MCCFIInstruction Instruction =
375 MCCFIInstruction::createRestore(Label, Register);
376 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
377 CurFrame->Instructions.push_back(Instruction);
378 }
379
EmitCFIEscape(StringRef Values)380 void MCStreamer::EmitCFIEscape(StringRef Values) {
381 MCSymbol *Label = EmitCFICommon();
382 MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
383 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
384 CurFrame->Instructions.push_back(Instruction);
385 }
386
EmitCFISignalFrame()387 void MCStreamer::EmitCFISignalFrame() {
388 EnsureValidFrame();
389 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
390 CurFrame->IsSignalFrame = true;
391 }
392
EmitCFIUndefined(int64_t Register)393 void MCStreamer::EmitCFIUndefined(int64_t Register) {
394 MCSymbol *Label = EmitCFICommon();
395 MCCFIInstruction Instruction =
396 MCCFIInstruction::createUndefined(Label, Register);
397 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
398 CurFrame->Instructions.push_back(Instruction);
399 }
400
EmitCFIRegister(int64_t Register1,int64_t Register2)401 void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
402 MCSymbol *Label = EmitCFICommon();
403 MCCFIInstruction Instruction =
404 MCCFIInstruction::createRegister(Label, Register1, Register2);
405 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
406 CurFrame->Instructions.push_back(Instruction);
407 }
408
EmitCFIWindowSave()409 void MCStreamer::EmitCFIWindowSave() {
410 MCSymbol *Label = EmitCFICommon();
411 MCCFIInstruction Instruction =
412 MCCFIInstruction::createWindowSave(Label);
413 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
414 CurFrame->Instructions.push_back(Instruction);
415 }
416
setCurrentW64UnwindInfo(MCWin64EHUnwindInfo * Frame)417 void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
418 W64UnwindInfos.push_back(Frame);
419 CurrentW64UnwindInfo = W64UnwindInfos.back();
420 }
421
EnsureValidW64UnwindInfo()422 void MCStreamer::EnsureValidW64UnwindInfo() {
423 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
424 if (!CurFrame || CurFrame->End)
425 report_fatal_error("No open Win64 EH frame function!");
426 }
427
EmitWinCFIStartProc(const MCSymbol * Symbol)428 void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
429 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
430 if (CurFrame && !CurFrame->End)
431 report_fatal_error("Starting a function before ending the previous one!");
432 MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
433 Frame->Begin = getContext().CreateTempSymbol();
434 Frame->Function = Symbol;
435 EmitLabel(Frame->Begin);
436 setCurrentW64UnwindInfo(Frame);
437 }
438
EmitWinCFIEndProc()439 void MCStreamer::EmitWinCFIEndProc() {
440 EnsureValidW64UnwindInfo();
441 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
442 if (CurFrame->ChainedParent)
443 report_fatal_error("Not all chained regions terminated!");
444 CurFrame->End = getContext().CreateTempSymbol();
445 EmitLabel(CurFrame->End);
446 }
447
EmitWinCFIStartChained()448 void MCStreamer::EmitWinCFIStartChained() {
449 EnsureValidW64UnwindInfo();
450 MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
451 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
452 Frame->Begin = getContext().CreateTempSymbol();
453 Frame->Function = CurFrame->Function;
454 Frame->ChainedParent = CurFrame;
455 EmitLabel(Frame->Begin);
456 setCurrentW64UnwindInfo(Frame);
457 }
458
EmitWinCFIEndChained()459 void MCStreamer::EmitWinCFIEndChained() {
460 EnsureValidW64UnwindInfo();
461 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
462 if (!CurFrame->ChainedParent)
463 report_fatal_error("End of a chained region outside a chained region!");
464 CurFrame->End = getContext().CreateTempSymbol();
465 EmitLabel(CurFrame->End);
466 CurrentW64UnwindInfo = CurFrame->ChainedParent;
467 }
468
EmitWinEHHandler(const MCSymbol * Sym,bool Unwind,bool Except)469 void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
470 bool Except) {
471 EnsureValidW64UnwindInfo();
472 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
473 if (CurFrame->ChainedParent)
474 report_fatal_error("Chained unwind areas can't have handlers!");
475 CurFrame->ExceptionHandler = Sym;
476 if (!Except && !Unwind)
477 report_fatal_error("Don't know what kind of handler this is!");
478 if (Unwind)
479 CurFrame->HandlesUnwind = true;
480 if (Except)
481 CurFrame->HandlesExceptions = true;
482 }
483
EmitWinEHHandlerData()484 void MCStreamer::EmitWinEHHandlerData() {
485 EnsureValidW64UnwindInfo();
486 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
487 if (CurFrame->ChainedParent)
488 report_fatal_error("Chained unwind areas can't have handlers!");
489 }
490
EmitWinCFIPushReg(unsigned Register)491 void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
492 EnsureValidW64UnwindInfo();
493 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
494 MCSymbol *Label = getContext().CreateTempSymbol();
495 MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
496 EmitLabel(Label);
497 CurFrame->Instructions.push_back(Inst);
498 }
499
EmitWinCFISetFrame(unsigned Register,unsigned Offset)500 void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
501 EnsureValidW64UnwindInfo();
502 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
503 if (CurFrame->LastFrameInst >= 0)
504 report_fatal_error("Frame register and offset already specified!");
505 if (Offset & 0x0F)
506 report_fatal_error("Misaligned frame pointer offset!");
507 if (Offset > 240)
508 report_fatal_error("Frame offset must be less than or equal to 240!");
509 MCSymbol *Label = getContext().CreateTempSymbol();
510 MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, Label, Register, Offset);
511 EmitLabel(Label);
512 CurFrame->LastFrameInst = CurFrame->Instructions.size();
513 CurFrame->Instructions.push_back(Inst);
514 }
515
EmitWinCFIAllocStack(unsigned Size)516 void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
517 EnsureValidW64UnwindInfo();
518 if (Size == 0)
519 report_fatal_error("Allocation size must be non-zero!");
520 if (Size & 7)
521 report_fatal_error("Misaligned stack allocation!");
522 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
523 MCSymbol *Label = getContext().CreateTempSymbol();
524 MCWin64EHInstruction Inst(Label, Size);
525 EmitLabel(Label);
526 CurFrame->Instructions.push_back(Inst);
527 }
528
EmitWinCFISaveReg(unsigned Register,unsigned Offset)529 void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
530 EnsureValidW64UnwindInfo();
531 if (Offset & 7)
532 report_fatal_error("Misaligned saved register offset!");
533 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
534 MCSymbol *Label = getContext().CreateTempSymbol();
535 MCWin64EHInstruction Inst(
536 Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
537 Label, Register, Offset);
538 EmitLabel(Label);
539 CurFrame->Instructions.push_back(Inst);
540 }
541
EmitWinCFISaveXMM(unsigned Register,unsigned Offset)542 void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
543 EnsureValidW64UnwindInfo();
544 if (Offset & 0x0F)
545 report_fatal_error("Misaligned saved vector register offset!");
546 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
547 MCSymbol *Label = getContext().CreateTempSymbol();
548 MCWin64EHInstruction Inst(
549 Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
550 Label, Register, Offset);
551 EmitLabel(Label);
552 CurFrame->Instructions.push_back(Inst);
553 }
554
EmitWinCFIPushFrame(bool Code)555 void MCStreamer::EmitWinCFIPushFrame(bool Code) {
556 EnsureValidW64UnwindInfo();
557 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
558 if (CurFrame->Instructions.size() > 0)
559 report_fatal_error("If present, PushMachFrame must be the first UOP");
560 MCSymbol *Label = getContext().CreateTempSymbol();
561 MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
562 EmitLabel(Label);
563 CurFrame->Instructions.push_back(Inst);
564 }
565
EmitWinCFIEndProlog()566 void MCStreamer::EmitWinCFIEndProlog() {
567 EnsureValidW64UnwindInfo();
568 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
569 CurFrame->PrologEnd = getContext().CreateTempSymbol();
570 EmitLabel(CurFrame->PrologEnd);
571 }
572
EmitCOFFSectionIndex(MCSymbol const * Symbol)573 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
574 }
575
EmitCOFFSecRel32(MCSymbol const * Symbol)576 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
577 }
578
579 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
580 /// the specified string in the output .s file. This capability is
581 /// indicated by the hasRawTextSupport() predicate.
EmitRawTextImpl(StringRef String)582 void MCStreamer::EmitRawTextImpl(StringRef String) {
583 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
584 " something must not be fully mc'ized\n";
585 abort();
586 }
587
EmitRawText(const Twine & T)588 void MCStreamer::EmitRawText(const Twine &T) {
589 SmallString<128> Str;
590 EmitRawTextImpl(T.toStringRef(Str));
591 }
592
EmitW64Tables()593 void MCStreamer::EmitW64Tables() {
594 if (!getNumW64UnwindInfos())
595 return;
596
597 MCWin64EHUnwindEmitter::Emit(*this);
598 }
599
Finish()600 void MCStreamer::Finish() {
601 if (!FrameInfos.empty() && !FrameInfos.back().End)
602 report_fatal_error("Unfinished frame!");
603
604 MCTargetStreamer *TS = getTargetStreamer();
605 if (TS)
606 TS->finish();
607
608 FinishImpl();
609 }
610
EmitAssignment(MCSymbol * Symbol,const MCExpr * Value)611 void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
612 visitUsedExpr(*Value);
613 Symbol->setVariableValue(Value);
614
615 MCTargetStreamer *TS = getTargetStreamer();
616 if (TS)
617 TS->emitAssignment(Symbol, Value);
618 }
619
visitUsedSymbol(const MCSymbol & Sym)620 void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
621 }
622
visitUsedExpr(const MCExpr & Expr)623 void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
624 switch (Expr.getKind()) {
625 case MCExpr::Target:
626 cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
627 break;
628
629 case MCExpr::Constant:
630 break;
631
632 case MCExpr::Binary: {
633 const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
634 visitUsedExpr(*BE.getLHS());
635 visitUsedExpr(*BE.getRHS());
636 break;
637 }
638
639 case MCExpr::SymbolRef:
640 visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
641 break;
642
643 case MCExpr::Unary:
644 visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
645 break;
646 }
647 }
648
EmitInstruction(const MCInst & Inst,const MCSubtargetInfo & STI)649 void MCStreamer::EmitInstruction(const MCInst &Inst,
650 const MCSubtargetInfo &STI) {
651 // Scan for values.
652 for (unsigned i = Inst.getNumOperands(); i--;)
653 if (Inst.getOperand(i).isExpr())
654 visitUsedExpr(*Inst.getOperand(i).getExpr());
655 }
656
EmitAssemblerFlag(MCAssemblerFlag Flag)657 void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
EmitThumbFunc(MCSymbol * Func)658 void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
EmitSymbolDesc(MCSymbol * Symbol,unsigned DescValue)659 void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
BeginCOFFSymbolDef(const MCSymbol * Symbol)660 void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
EndCOFFSymbolDef()661 void MCStreamer::EndCOFFSymbolDef() {}
EmitFileDirective(StringRef Filename)662 void MCStreamer::EmitFileDirective(StringRef Filename) {}
EmitCOFFSymbolStorageClass(int StorageClass)663 void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {}
EmitCOFFSymbolType(int Type)664 void MCStreamer::EmitCOFFSymbolType(int Type) {}
EmitELFSize(MCSymbol * Symbol,const MCExpr * Value)665 void MCStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
EmitLocalCommonSymbol(MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment)666 void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
667 unsigned ByteAlignment) {}
EmitTBSSSymbol(const MCSection * Section,MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment)668 void MCStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
669 uint64_t Size, unsigned ByteAlignment) {}
ChangeSection(const MCSection *,const MCExpr *)670 void MCStreamer::ChangeSection(const MCSection *, const MCExpr *) {}
EmitWeakReference(MCSymbol * Alias,const MCSymbol * Symbol)671 void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
EmitBytes(StringRef Data)672 void MCStreamer::EmitBytes(StringRef Data) {}
EmitValueImpl(const MCExpr * Value,unsigned Size,const SMLoc & Loc)673 void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
674 const SMLoc &Loc) {
675 visitUsedExpr(*Value);
676 }
EmitULEB128Value(const MCExpr * Value)677 void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
EmitSLEB128Value(const MCExpr * Value)678 void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
EmitValueToAlignment(unsigned ByteAlignment,int64_t Value,unsigned ValueSize,unsigned MaxBytesToEmit)679 void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
680 unsigned ValueSize,
681 unsigned MaxBytesToEmit) {}
EmitCodeAlignment(unsigned ByteAlignment,unsigned MaxBytesToEmit)682 void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
683 unsigned MaxBytesToEmit) {}
EmitValueToOffset(const MCExpr * Offset,unsigned char Value)684 bool MCStreamer::EmitValueToOffset(const MCExpr *Offset, unsigned char Value) {
685 return false;
686 }
EmitBundleAlignMode(unsigned AlignPow2)687 void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
EmitBundleLock(bool AlignToEnd)688 void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
FinishImpl()689 void MCStreamer::FinishImpl() {}
EmitBundleUnlock()690 void MCStreamer::EmitBundleUnlock() {}
691