1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
|
//===- lib/MC/MCAsmStreamer.cpp - Text Assembly Output --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
using namespace llvm;
namespace {
class MCAsmStreamer : public MCStreamer {
formatted_raw_ostream &OS;
const MCAsmInfo &MAI;
OwningPtr<MCInstPrinter> InstPrinter;
MCCodeEmitter *Emitter;
SmallString<128> CommentToEmit;
raw_svector_ostream CommentStream;
unsigned IsLittleEndian : 1;
unsigned IsVerboseAsm : 1;
unsigned ShowInst : 1;
public:
MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
bool isLittleEndian, bool isVerboseAsm, MCInstPrinter *printer,
MCCodeEmitter *emitter, bool showInst)
: MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
InstPrinter(printer), Emitter(emitter), CommentStream(CommentToEmit),
IsLittleEndian(isLittleEndian), IsVerboseAsm(isVerboseAsm),
ShowInst(showInst) {
if (InstPrinter && IsVerboseAsm)
InstPrinter->setCommentStream(CommentStream);
}
~MCAsmStreamer() {}
bool isLittleEndian() const { return IsLittleEndian; }
inline void EmitEOL() {
// If we don't have any comments, just emit a \n.
if (!IsVerboseAsm) {
OS << '\n';
return;
}
EmitCommentsAndEOL();
}
void EmitCommentsAndEOL();
/// isVerboseAsm - Return true if this streamer supports verbose assembly at
/// all.
virtual bool isVerboseAsm() const { return IsVerboseAsm; }
/// hasRawTextSupport - We support EmitRawText.
virtual bool hasRawTextSupport() const { return true; }
/// AddComment - Add a comment that can be emitted to the generated .s
/// file if applicable as a QoI issue to make the output of the compiler
/// more readable. This only affects the MCAsmStreamer, and only when
/// verbose assembly output is enabled.
virtual void AddComment(const Twine &T);
/// AddEncodingComment - Add a comment showing the encoding of an instruction.
virtual void AddEncodingComment(const MCInst &Inst);
/// GetCommentOS - Return a raw_ostream that comments can be written to.
/// Unlike AddComment, you are required to terminate comments with \n if you
/// use this method.
virtual raw_ostream &GetCommentOS() {
if (!IsVerboseAsm)
return nulls(); // Discard comments unless in verbose asm mode.
return CommentStream;
}
/// AddBlankLine - Emit a blank line to a .s file to pretty it up.
virtual void AddBlankLine() {
EmitEOL();
}
/// @name MCStreamer Interface
/// @{
virtual void SwitchSection(const MCSection *Section);
virtual void EmitLabel(MCSymbol *Symbol);
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
virtual void EmitCOFFSymbolStorageClass(int StorageClass);
virtual void EmitCOFFSymbolType(int Type);
virtual void EndCOFFSymbolDef();
virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment);
/// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
///
/// @param Symbol - The common symbol to emit.
/// @param Size - The size of the common symbol.
virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
unsigned Size = 0, unsigned ByteAlignment = 0);
virtual void EmitTBSSSymbol (MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment = 0);
virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
virtual void EmitIntValue(uint64_t Value, unsigned Size, unsigned AddrSpace);
virtual void EmitGPRel32Value(const MCExpr *Value);
virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
unsigned AddrSpace);
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
unsigned ValueSize = 1,
unsigned MaxBytesToEmit = 0);
virtual void EmitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit = 0);
virtual void EmitValueToOffset(const MCExpr *Offset,
unsigned char Value = 0);
virtual void EmitFileDirective(StringRef Filename);
virtual void EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
virtual void EmitInstruction(const MCInst &Inst);
/// EmitRawText - If this file is backed by a assembly streamer, this dumps
/// the specified string in the output .s file. This capability is
/// indicated by the hasRawTextSupport() predicate.
virtual void EmitRawText(StringRef String);
virtual void Finish();
/// @}
};
} // end anonymous namespace.
/// AddComment - Add a comment that can be emitted to the generated .s
/// file if applicable as a QoI issue to make the output of the compiler
/// more readable. This only affects the MCAsmStreamer, and only when
/// verbose assembly output is enabled.
void MCAsmStreamer::AddComment(const Twine &T) {
if (!IsVerboseAsm) return;
// Make sure that CommentStream is flushed.
CommentStream.flush();
T.toVector(CommentToEmit);
// Each comment goes on its own line.
CommentToEmit.push_back('\n');
// Tell the comment stream that the vector changed underneath it.
CommentStream.resync();
}
void MCAsmStreamer::EmitCommentsAndEOL() {
if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
OS << '\n';
return;
}
CommentStream.flush();
StringRef Comments = CommentToEmit.str();
assert(Comments.back() == '\n' &&
"Comment array not newline terminated");
do {
// Emit a line of comments.
OS.PadToColumn(MAI.getCommentColumn());
size_t Position = Comments.find('\n');
OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
Comments = Comments.substr(Position+1);
} while (!Comments.empty());
CommentToEmit.clear();
// Tell the comment stream that the vector changed underneath it.
CommentStream.resync();
}
static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
assert(Bytes && "Invalid size!");
return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
}
void MCAsmStreamer::SwitchSection(const MCSection *Section) {
assert(Section && "Cannot switch to a null section!");
if (Section != CurSection) {
CurSection = Section;
Section->PrintSwitchToSection(MAI, OS);
}
}
void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
assert(CurSection && "Cannot emit before setting section!");
OS << *Symbol << ":";
EmitEOL();
Symbol->setSection(*CurSection);
}
void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
switch (Flag) {
default: assert(0 && "Invalid flag!");
case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
}
EmitEOL();
}
void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
OS << *Symbol << " = " << *Value;
EmitEOL();
// FIXME: Lift context changes into super class.
Symbol->setVariableValue(Value);
}
void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
MCSymbolAttr Attribute) {
switch (Attribute) {
case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
case MCSA_ELF_TypeFunction: /// .type _foo, STT_FUNC # aka @function
case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
case MCSA_ELF_TypeObject: /// .type _foo, STT_OBJECT # aka @object
case MCSA_ELF_TypeTLS: /// .type _foo, STT_TLS # aka @tls_object
case MCSA_ELF_TypeCommon: /// .type _foo, STT_COMMON # aka @common
case MCSA_ELF_TypeNoType: /// .type _foo, STT_NOTYPE # aka @notype
assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
OS << "\t.type\t" << *Symbol << ','
<< ((MAI.getCommentString()[0] != '@') ? '@' : '%');
switch (Attribute) {
default: assert(0 && "Unknown ELF .type");
case MCSA_ELF_TypeFunction: OS << "function"; break;
case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
case MCSA_ELF_TypeObject: OS << "object"; break;
case MCSA_ELF_TypeTLS: OS << "tls_object"; break;
case MCSA_ELF_TypeCommon: OS << "common"; break;
case MCSA_ELF_TypeNoType: OS << "no_type"; break;
}
EmitEOL();
return;
case MCSA_Global: // .globl/.global
OS << MAI.getGlobalDirective();
break;
case MCSA_Hidden: OS << ".hidden "; break;
case MCSA_IndirectSymbol: OS << ".indirect_symbol "; break;
case MCSA_Internal: OS << ".internal "; break;
case MCSA_LazyReference: OS << ".lazy_reference "; break;
case MCSA_Local: OS << ".local "; break;
case MCSA_NoDeadStrip: OS << ".no_dead_strip "; break;
case MCSA_PrivateExtern: OS << ".private_extern "; break;
case MCSA_Protected: OS << ".protected "; break;
case MCSA_Reference: OS << ".reference "; break;
case MCSA_Weak: OS << ".weak "; break;
case MCSA_WeakDefinition: OS << ".weak_definition "; break;
// .weak_reference
case MCSA_WeakReference: OS << MAI.getWeakRefDirective(); break;
}
OS << *Symbol;
EmitEOL();
}
void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
EmitEOL();
}
void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
OS << "\t.def\t " << *Symbol << ';';
EmitEOL();
}
void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
OS << "\t.scl\t" << StorageClass << ';';
EmitEOL();
}
void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
OS << "\t.type\t" << Type << ';';
EmitEOL();
}
void MCAsmStreamer::EndCOFFSymbolDef() {
OS << "\t.endef";
EmitEOL();
}
void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
assert(MAI.hasDotTypeDotSizeDirective());
OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
}
void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) {
OS << "\t.comm\t" << *Symbol << ',' << Size;
if (ByteAlignment != 0) {
if (MAI.getCOMMDirectiveAlignmentIsInBytes())
OS << ',' << ByteAlignment;
else
OS << ',' << Log2_32(ByteAlignment);
}
EmitEOL();
}
/// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
///
/// @param Symbol - The common symbol to emit.
/// @param Size - The size of the common symbol.
void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
assert(MAI.hasLCOMMDirective() && "Doesn't have .lcomm, can't emit it!");
OS << "\t.lcomm\t" << *Symbol << ',' << Size;
EmitEOL();
}
void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
unsigned Size, unsigned ByteAlignment) {
// Note: a .zerofill directive does not switch sections.
OS << ".zerofill ";
// This is a mach-o specific directive.
const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
if (Symbol != NULL) {
OS << ',' << *Symbol << ',' << Size;
if (ByteAlignment != 0)
OS << ',' << Log2_32(ByteAlignment);
}
EmitEOL();
}
// .tbss sym, size, align
// This depends that the symbol has already been mangled from the original,
// e.g. _a.
void MCAsmStreamer::EmitTBSSSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) {
assert(Symbol != NULL && "Symbol shouldn't be NULL!");
OS << ".tbss " << *Symbol << ", " << Size;
// Output align if we have it.
if (ByteAlignment != 0) OS << ", " << Log2_32(ByteAlignment);
EmitEOL();
}
static inline char toOctal(int X) { return (X&7)+'0'; }
static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
OS << '"';
for (unsigned i = 0, e = Data.size(); i != e; ++i) {
unsigned char C = Data[i];
if (C == '"' || C == '\\') {
OS << '\\' << (char)C;
continue;
}
if (isprint((unsigned char)C)) {
OS << (char)C;
continue;
}
switch (C) {
case '\b': OS << "\\b"; break;
case '\f': OS << "\\f"; break;
case '\n': OS << "\\n"; break;
case '\r': OS << "\\r"; break;
case '\t': OS << "\\t"; break;
default:
OS << '\\';
OS << toOctal(C >> 6);
OS << toOctal(C >> 3);
OS << toOctal(C >> 0);
break;
}
}
OS << '"';
}
void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
assert(CurSection && "Cannot emit contents before setting section!");
if (Data.empty()) return;
if (Data.size() == 1) {
OS << MAI.getData8bitsDirective(AddrSpace);
OS << (unsigned)(unsigned char)Data[0];
EmitEOL();
return;
}
// If the data ends with 0 and the target supports .asciz, use it, otherwise
// use .ascii
if (MAI.getAscizDirective() && Data.back() == 0) {
OS << MAI.getAscizDirective();
Data = Data.substr(0, Data.size()-1);
} else {
OS << MAI.getAsciiDirective();
}
OS << ' ';
PrintQuotedString(Data, OS);
EmitEOL();
}
/// EmitIntValue - Special case of EmitValue that avoids the client having
/// to pass in a MCExpr for constant integers.
void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
unsigned AddrSpace) {
assert(CurSection && "Cannot emit contents before setting section!");
const char *Directive = 0;
switch (Size) {
default: break;
case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
case 8:
Directive = MAI.getData64bitsDirective(AddrSpace);
// If the target doesn't support 64-bit data, emit as two 32-bit halves.
if (Directive) break;
if (isLittleEndian()) {
EmitIntValue((uint32_t)(Value >> 0 ), 4, AddrSpace);
EmitIntValue((uint32_t)(Value >> 32), 4, AddrSpace);
} else {
EmitIntValue((uint32_t)(Value >> 32), 4, AddrSpace);
EmitIntValue((uint32_t)(Value >> 0 ), 4, AddrSpace);
}
return;
}
assert(Directive && "Invalid size for machine code value!");
OS << Directive << truncateToSize(Value, Size);
EmitEOL();
}
void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
unsigned AddrSpace) {
assert(CurSection && "Cannot emit contents before setting section!");
const char *Directive = 0;
switch (Size) {
default: break;
case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
case 8: Directive = MAI.getData64bitsDirective(AddrSpace); break;
}
assert(Directive && "Invalid size for machine code value!");
OS << Directive << *Value;
EmitEOL();
}
void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
assert(MAI.getGPRel32Directive() != 0);
OS << MAI.getGPRel32Directive() << *Value;
EmitEOL();
}
/// EmitFill - Emit NumBytes bytes worth of the value specified by
/// FillValue. This implements directives such as '.space'.
void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
unsigned AddrSpace) {
if (NumBytes == 0) return;
if (AddrSpace == 0)
if (const char *ZeroDirective = MAI.getZeroDirective()) {
OS << ZeroDirective << NumBytes;
if (FillValue != 0)
OS << ',' << (int)FillValue;
EmitEOL();
return;
}
// Emit a byte at a time.
MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
}
void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
unsigned ValueSize,
unsigned MaxBytesToEmit) {
// Some assemblers don't support non-power of two alignments, so we always
// emit alignments as a power of two if possible.
if (isPowerOf2_32(ByteAlignment)) {
switch (ValueSize) {
default: llvm_unreachable("Invalid size for machine code value!");
case 1: OS << MAI.getAlignDirective(); break;
// FIXME: use MAI for this!
case 2: OS << ".p2alignw "; break;
case 4: OS << ".p2alignl "; break;
case 8: llvm_unreachable("Unsupported alignment size!");
}
if (MAI.getAlignmentIsInBytes())
OS << ByteAlignment;
else
OS << Log2_32(ByteAlignment);
if (Value || MaxBytesToEmit) {
OS << ", 0x";
OS.write_hex(truncateToSize(Value, ValueSize));
if (MaxBytesToEmit)
OS << ", " << MaxBytesToEmit;
}
EmitEOL();
return;
}
// Non-power of two alignment. This is not widely supported by assemblers.
// FIXME: Parameterize this based on MAI.
switch (ValueSize) {
default: llvm_unreachable("Invalid size for machine code value!");
case 1: OS << ".balign"; break;
case 2: OS << ".balignw"; break;
case 4: OS << ".balignl"; break;
case 8: llvm_unreachable("Unsupported alignment size!");
}
OS << ' ' << ByteAlignment;
OS << ", " << truncateToSize(Value, ValueSize);
if (MaxBytesToEmit)
OS << ", " << MaxBytesToEmit;
EmitEOL();
}
void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit) {
// Emit with a text fill value.
EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
1, MaxBytesToEmit);
}
void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
unsigned char Value) {
// FIXME: Verify that Offset is associated with the current section.
OS << ".org " << *Offset << ", " << (unsigned) Value;
EmitEOL();
}
void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
assert(MAI.hasSingleParameterDotFile());
OS << "\t.file\t";
PrintQuotedString(Filename, OS);
EmitEOL();
}
void MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
OS << "\t.file\t" << FileNo << ' ';
PrintQuotedString(Filename, OS);
EmitEOL();
}
void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
raw_ostream &OS = GetCommentOS();
SmallString<256> Code;
SmallVector<MCFixup, 4> Fixups;
raw_svector_ostream VecOS(Code);
Emitter->EncodeInstruction(Inst, VecOS, Fixups);
VecOS.flush();
// If we are showing fixups, create symbolic markers in the encoded
// representation. We do this by making a per-bit map to the fixup item index,
// then trying to display it as nicely as possible.
SmallVector<uint8_t, 64> FixupMap;
FixupMap.resize(Code.size() * 8);
for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
FixupMap[i] = 0;
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
MCFixup &F = Fixups[i];
const MCFixupKindInfo &Info = Emitter->getFixupKindInfo(F.getKind());
for (unsigned j = 0; j != Info.TargetSize; ++j) {
unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
FixupMap[Index] = 1 + i;
}
}
OS << "encoding: [";
for (unsigned i = 0, e = Code.size(); i != e; ++i) {
if (i)
OS << ',';
// See if all bits are the same map entry.
uint8_t MapEntry = FixupMap[i * 8 + 0];
for (unsigned j = 1; j != 8; ++j) {
if (FixupMap[i * 8 + j] == MapEntry)
continue;
MapEntry = uint8_t(~0U);
break;
}
if (MapEntry != uint8_t(~0U)) {
if (MapEntry == 0) {
OS << format("0x%02x", uint8_t(Code[i]));
} else {
assert(Code[i] == 0 && "Encoder wrote into fixed up bit!");
OS << char('A' + MapEntry - 1);
}
} else {
// Otherwise, write out in binary.
OS << "0b";
for (unsigned j = 8; j--;) {
unsigned Bit = (Code[i] >> j) & 1;
if (uint8_t MapEntry = FixupMap[i * 8 + j]) {
assert(Bit == 0 && "Encoder wrote into fixed up bit!");
OS << char('A' + MapEntry - 1);
} else
OS << Bit;
}
}
}
OS << "]\n";
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
MCFixup &F = Fixups[i];
const MCFixupKindInfo &Info = Emitter->getFixupKindInfo(F.getKind());
OS << " fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
<< ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
}
}
void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
assert(CurSection && "Cannot emit contents before setting section!");
// Show the encoding in a comment if we have a code emitter.
if (Emitter)
AddEncodingComment(Inst);
// Show the MCInst if enabled.
if (ShowInst)
Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
// If we have an AsmPrinter, use that to print, otherwise print the MCInst.
if (InstPrinter)
InstPrinter->printInst(&Inst, OS);
else
Inst.print(OS, &MAI);
EmitEOL();
}
/// EmitRawText - If this file is backed by a assembly streamer, this dumps
/// the specified string in the output .s file. This capability is
/// indicated by the hasRawTextSupport() predicate.
void MCAsmStreamer::EmitRawText(StringRef String) {
if (!String.empty() && String.back() == '\n')
String = String.substr(0, String.size()-1);
OS << String;
EmitEOL();
}
void MCAsmStreamer::Finish() {
OS.flush();
}
MCStreamer *llvm::createAsmStreamer(MCContext &Context,
formatted_raw_ostream &OS,
bool isLittleEndian,
bool isVerboseAsm, MCInstPrinter *IP,
MCCodeEmitter *CE, bool ShowInst) {
return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
IP, CE, ShowInst);
}
|