1 //===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the AsmPrinter class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/AsmPrinter.h"
15 #include "llvm/Assembly/Writer.h"
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/Constants.h"
18 #include "llvm/Module.h"
19 #include "llvm/CodeGen/MachineConstantPool.h"
20 #include "llvm/CodeGen/MachineJumpTableInfo.h"
21 #include "llvm/Support/CommandLine.h"
22 #include "llvm/Support/Mangler.h"
23 #include "llvm/Support/MathExtras.h"
24 #include "llvm/Support/Streams.h"
25 #include "llvm/Target/TargetAsmInfo.h"
26 #include "llvm/Target/TargetData.h"
27 #include "llvm/Target/TargetLowering.h"
28 #include "llvm/Target/TargetMachine.h"
33 AsmVerbose("asm-verbose", cl::Hidden, cl::desc("Add comments to directives."));
35 char AsmPrinter::ID = 0;
36 AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm,
37 const TargetAsmInfo *T)
38 : MachineFunctionPass((intptr_t)&ID), FunctionNumber(0), O(o), TM(tm), TAI(T)
41 std::string AsmPrinter::getSectionForFunction(const Function &F) const {
42 return TAI->getTextSection();
46 /// SwitchToTextSection - Switch to the specified text section of the executable
47 /// if we are not already in it!
49 void AsmPrinter::SwitchToTextSection(const char *NewSection,
50 const GlobalValue *GV) {
52 if (GV && GV->hasSection())
53 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
57 // If we're already in this section, we're done.
58 if (CurrentSection == NS) return;
60 // Close the current section, if applicable.
61 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
62 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
66 if (!CurrentSection.empty())
67 O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
70 /// SwitchToDataSection - Switch to the specified data section of the executable
71 /// if we are not already in it!
73 void AsmPrinter::SwitchToDataSection(const char *NewSection,
74 const GlobalValue *GV) {
76 if (GV && GV->hasSection())
77 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
81 // If we're already in this section, we're done.
82 if (CurrentSection == NS) return;
84 // Close the current section, if applicable.
85 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
86 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
90 if (!CurrentSection.empty())
91 O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
95 bool AsmPrinter::doInitialization(Module &M) {
96 Mang = new Mangler(M, TAI->getGlobalPrefix());
98 if (!M.getModuleInlineAsm().empty())
99 O << TAI->getCommentString() << " Start of file scope inline assembly\n"
100 << M.getModuleInlineAsm()
101 << "\n" << TAI->getCommentString()
102 << " End of file scope inline assembly\n";
104 SwitchToDataSection(""); // Reset back to no section.
106 if (MachineModuleInfo *MMI = getAnalysisToUpdate<MachineModuleInfo>()) {
107 MMI->AnalyzeModule(M);
113 bool AsmPrinter::doFinalization(Module &M) {
114 if (TAI->getWeakRefDirective()) {
115 if (!ExtWeakSymbols.empty())
116 SwitchToDataSection("");
118 for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(),
119 e = ExtWeakSymbols.end(); i != e; ++i) {
120 const GlobalValue *GV = *i;
121 std::string Name = Mang->getValueName(GV);
122 O << TAI->getWeakRefDirective() << Name << "\n";
126 if (TAI->getSetDirective()) {
127 if (!M.alias_empty())
128 SwitchToTextSection(TAI->getTextSection());
131 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
133 std::string Name = Mang->getValueName(I);
136 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
137 Target = Mang->getValueName(GV);
139 if (I->hasExternalLinkage() || !TAI->getWeakRefDirective())
140 O << "\t.globl\t" << Name << "\n";
141 else if (I->hasWeakLinkage())
142 O << TAI->getWeakRefDirective() << Name << "\n";
143 else if (!I->hasInternalLinkage())
144 assert(0 && "Invalid alias linkage");
146 O << TAI->getSetDirective() << Name << ", " << Target << "\n";
148 // If the aliasee has external weak linkage it can be referenced only by
149 // alias itself. In this case it can be not in ExtWeakSymbols list. Emit
150 // weak reference in such case.
151 if (GV->hasExternalWeakLinkage())
152 if (TAI->getWeakRefDirective())
153 O << TAI->getWeakRefDirective() << Target << "\n";
155 O << "\t.globl\t" << Target << "\n";
159 delete Mang; Mang = 0;
163 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
164 // What's my mangled name?
165 CurrentFnName = Mang->getValueName(MF.getFunction());
166 IncrementFunctionNumber();
169 /// EmitConstantPool - Print to the current output stream assembly
170 /// representations of the constants in the constant pool MCP. This is
171 /// used to print out constants which have been "spilled to memory" by
172 /// the code generator.
174 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
175 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
176 if (CP.empty()) return;
178 // Some targets require 4-, 8-, and 16- byte constant literals to be placed
179 // in special sections.
180 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
181 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
182 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
183 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
184 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
185 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
186 MachineConstantPoolEntry CPE = CP[i];
187 const Type *Ty = CPE.getType();
188 if (TAI->getFourByteConstantSection() &&
189 TM.getTargetData()->getTypeSize(Ty) == 4)
190 FourByteCPs.push_back(std::make_pair(CPE, i));
191 else if (TAI->getEightByteConstantSection() &&
192 TM.getTargetData()->getTypeSize(Ty) == 8)
193 EightByteCPs.push_back(std::make_pair(CPE, i));
194 else if (TAI->getSixteenByteConstantSection() &&
195 TM.getTargetData()->getTypeSize(Ty) == 16)
196 SixteenByteCPs.push_back(std::make_pair(CPE, i));
198 OtherCPs.push_back(std::make_pair(CPE, i));
201 unsigned Alignment = MCP->getConstantPoolAlignment();
202 EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
203 EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
204 EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
206 EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
209 void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
210 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
211 if (CP.empty()) return;
213 SwitchToDataSection(Section);
214 EmitAlignment(Alignment);
215 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
216 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
217 << CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << " ";
218 WriteTypeSymbolic(O, CP[i].first.getType(), 0) << '\n';
219 if (CP[i].first.isMachineConstantPoolEntry())
220 EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
222 EmitGlobalConstant(CP[i].first.Val.ConstVal);
224 const Type *Ty = CP[i].first.getType();
226 TM.getTargetData()->getTypeSize(Ty);
227 unsigned ValEnd = CP[i].first.getOffset() + EntSize;
228 // Emit inter-object padding for alignment.
229 EmitZeros(CP[i+1].first.getOffset()-ValEnd);
234 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
235 /// by the current function to the current output stream.
237 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
238 MachineFunction &MF) {
239 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
240 if (JT.empty()) return;
241 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
243 // Use JumpTableDirective otherwise honor the entry size from the jump table
245 const char *JTEntryDirective = TAI->getJumpTableDirective();
246 bool HadJTEntryDirective = JTEntryDirective != NULL;
247 if (!HadJTEntryDirective) {
248 JTEntryDirective = MJTI->getEntrySize() == 4 ?
249 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
252 // Pick the directive to use to print the jump table entries, and switch to
253 // the appropriate section.
254 TargetLowering *LoweringInfo = TM.getTargetLowering();
256 const char* JumpTableDataSection = TAI->getJumpTableDataSection();
257 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
258 !JumpTableDataSection) {
259 // In PIC mode, we need to emit the jump table to the same section as the
260 // function body itself, otherwise the label differences won't make sense.
261 // We should also do if the section name is NULL.
262 const Function *F = MF.getFunction();
263 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
265 SwitchToDataSection(JumpTableDataSection);
268 EmitAlignment(Log2_32(MJTI->getAlignment()));
270 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
271 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
273 // If this jump table was deleted, ignore it.
274 if (JTBBs.empty()) continue;
276 // For PIC codegen, if possible we want to use the SetDirective to reduce
277 // the number of relocations the assembler will generate for the jump table.
278 // Set directives are all printed before the jump table itself.
279 std::set<MachineBasicBlock*> EmittedSets;
280 if (TAI->getSetDirective() && IsPic)
281 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
282 if (EmittedSets.insert(JTBBs[ii]).second)
283 printSetLabel(i, JTBBs[ii]);
285 // On some targets (e.g. darwin) we want to emit two consequtive labels
286 // before each jump table. The first label is never referenced, but tells
287 // the assembler and linker the extents of the jump table object. The
288 // second label is actually referenced by the code.
289 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
290 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
292 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
293 << '_' << i << ":\n";
295 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
296 O << JTEntryDirective << ' ';
297 // If we have emitted set directives for the jump table entries, print
298 // them rather than the entries themselves. If we're emitting PIC, then
299 // emit the table entries as differences between two text section labels.
300 // If we're emitting non-PIC code, then emit the entries as direct
301 // references to the target basic blocks.
302 if (!EmittedSets.empty()) {
303 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
304 << '_' << i << "_set_" << JTBBs[ii]->getNumber();
306 printBasicBlockLabel(JTBBs[ii], false, false);
307 // If the arch uses custom Jump Table directives, don't calc relative to
309 if (!HadJTEntryDirective)
310 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
311 << getFunctionNumber() << '_' << i;
313 printBasicBlockLabel(JTBBs[ii], false, false);
320 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
321 /// special global used by LLVM. If so, emit it and return true, otherwise
322 /// do nothing and return false.
323 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
324 if (GV->getName() == "llvm.used") {
325 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
326 EmitLLVMUsedList(GV->getInitializer());
330 // Ignore debug and non-emitted data.
331 if (GV->getSection() == "llvm.metadata") return true;
333 if (!GV->hasAppendingLinkage()) return false;
335 assert(GV->hasInitializer() && "Not a special LLVM global!");
337 const TargetData *TD = TM.getTargetData();
338 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
339 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
340 SwitchToDataSection(TAI->getStaticCtorsSection());
341 EmitAlignment(Align, 0);
342 EmitXXStructorList(GV->getInitializer());
346 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
347 SwitchToDataSection(TAI->getStaticDtorsSection());
348 EmitAlignment(Align, 0);
349 EmitXXStructorList(GV->getInitializer());
356 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
357 /// global in the specified llvm.used list as being used with this directive.
358 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
359 const char *Directive = TAI->getUsedDirective();
361 // Should be an array of 'sbyte*'.
362 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
363 if (InitList == 0) return;
365 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
367 EmitConstantValueOnly(InitList->getOperand(i));
372 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
373 /// function pointers, ignoring the init priority.
374 void AsmPrinter::EmitXXStructorList(Constant *List) {
375 // Should be an array of '{ int, void ()* }' structs. The first value is the
376 // init priority, which we ignore.
377 if (!isa<ConstantArray>(List)) return;
378 ConstantArray *InitList = cast<ConstantArray>(List);
379 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
380 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
381 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
383 if (CS->getOperand(1)->isNullValue())
384 return; // Found a null terminator, exit printing.
385 // Emit the function pointer.
386 EmitGlobalConstant(CS->getOperand(1));
390 /// getGlobalLinkName - Returns the asm/link name of of the specified
391 /// global variable. Should be overridden by each target asm printer to
392 /// generate the appropriate value.
393 const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
394 std::string LinkName;
396 if (isa<Function>(GV)) {
397 LinkName += TAI->getFunctionAddrPrefix();
398 LinkName += Mang->getValueName(GV);
399 LinkName += TAI->getFunctionAddrSuffix();
401 LinkName += TAI->getGlobalVarAddrPrefix();
402 LinkName += Mang->getValueName(GV);
403 LinkName += TAI->getGlobalVarAddrSuffix();
409 /// EmitExternalGlobal - Emit the external reference to a global variable.
410 /// Should be overridden if an indirect reference should be used.
411 void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
412 O << getGlobalLinkName(GV);
417 //===----------------------------------------------------------------------===//
418 /// LEB 128 number encoding.
420 /// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
421 /// representing an unsigned leb128 value.
422 void AsmPrinter::PrintULEB128(unsigned Value) const {
424 unsigned Byte = Value & 0x7f;
426 if (Value) Byte |= 0x80;
427 O << "0x" << std::hex << Byte << std::dec;
428 if (Value) O << ", ";
432 /// SizeULEB128 - Compute the number of bytes required for an unsigned leb128
434 unsigned AsmPrinter::SizeULEB128(unsigned Value) {
438 Size += sizeof(int8_t);
443 /// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
444 /// representing a signed leb128 value.
445 void AsmPrinter::PrintSLEB128(int Value) const {
446 int Sign = Value >> (8 * sizeof(Value) - 1);
450 unsigned Byte = Value & 0x7f;
452 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
453 if (IsMore) Byte |= 0x80;
454 O << "0x" << std::hex << Byte << std::dec;
455 if (IsMore) O << ", ";
459 /// SizeSLEB128 - Compute the number of bytes required for a signed leb128
461 unsigned AsmPrinter::SizeSLEB128(int Value) {
463 int Sign = Value >> (8 * sizeof(Value) - 1);
467 unsigned Byte = Value & 0x7f;
469 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
470 Size += sizeof(int8_t);
475 //===--------------------------------------------------------------------===//
476 // Emission and print routines
479 /// PrintHex - Print a value as a hexidecimal value.
481 void AsmPrinter::PrintHex(int Value) const {
482 O << "0x" << std::hex << Value << std::dec;
485 /// EOL - Print a newline character to asm stream. If a comment is present
486 /// then it will be printed first. Comments should not contain '\n'.
487 void AsmPrinter::EOL() const {
490 void AsmPrinter::EOL(const std::string &Comment) const {
491 if (AsmVerbose && !Comment.empty()) {
493 << TAI->getCommentString()
500 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
501 /// unsigned leb128 value.
502 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
503 if (TAI->hasLEB128()) {
507 O << TAI->getData8bitsDirective();
512 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
513 /// signed leb128 value.
514 void AsmPrinter::EmitSLEB128Bytes(int Value) const {
515 if (TAI->hasLEB128()) {
519 O << TAI->getData8bitsDirective();
524 /// EmitInt8 - Emit a byte directive and value.
526 void AsmPrinter::EmitInt8(int Value) const {
527 O << TAI->getData8bitsDirective();
528 PrintHex(Value & 0xFF);
531 /// EmitInt16 - Emit a short directive and value.
533 void AsmPrinter::EmitInt16(int Value) const {
534 O << TAI->getData16bitsDirective();
535 PrintHex(Value & 0xFFFF);
538 /// EmitInt32 - Emit a long directive and value.
540 void AsmPrinter::EmitInt32(int Value) const {
541 O << TAI->getData32bitsDirective();
545 /// EmitInt64 - Emit a long long directive and value.
547 void AsmPrinter::EmitInt64(uint64_t Value) const {
548 if (TAI->getData64bitsDirective()) {
549 O << TAI->getData64bitsDirective();
552 if (TM.getTargetData()->isBigEndian()) {
553 EmitInt32(unsigned(Value >> 32)); O << "\n";
554 EmitInt32(unsigned(Value));
556 EmitInt32(unsigned(Value)); O << "\n";
557 EmitInt32(unsigned(Value >> 32));
562 /// toOctal - Convert the low order bits of X into an octal digit.
564 static inline char toOctal(int X) {
568 /// printStringChar - Print a char, escaped if necessary.
570 static void printStringChar(std::ostream &O, unsigned char C) {
573 } else if (C == '\\') {
575 } else if (isprint(C)) {
579 case '\b': O << "\\b"; break;
580 case '\f': O << "\\f"; break;
581 case '\n': O << "\\n"; break;
582 case '\r': O << "\\r"; break;
583 case '\t': O << "\\t"; break;
586 O << toOctal(C >> 6);
587 O << toOctal(C >> 3);
588 O << toOctal(C >> 0);
594 /// EmitString - Emit a string with quotes and a null terminator.
595 /// Special characters are emitted properly.
596 /// \literal (Eg. '\t') \endliteral
597 void AsmPrinter::EmitString(const std::string &String) const {
598 const char* AscizDirective = TAI->getAscizDirective();
602 O << TAI->getAsciiDirective();
604 for (unsigned i = 0, N = String.size(); i < N; ++i) {
605 unsigned char C = String[i];
606 printStringChar(O, C);
615 //===----------------------------------------------------------------------===//
617 // EmitAlignment - Emit an alignment directive to the specified power of
618 // two boundary. For example, if you pass in 3 here, you will get an 8
619 // byte alignment. If a global value is specified, and if that global has
620 // an explicit alignment requested, it will unconditionally override the
621 // alignment request. However, if ForcedAlignBits is specified, this value
622 // has final say: the ultimate alignment will be the max of ForcedAlignBits
623 // and the alignment computed with NumBits and the global.
627 // if (GV && GV->hasalignment) Align = GV->getalignment();
628 // Align = std::max(Align, ForcedAlignBits);
630 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
631 unsigned ForcedAlignBits, bool UseFillExpr,
632 unsigned FillValue) const {
633 if (GV && GV->getAlignment())
634 NumBits = Log2_32(GV->getAlignment());
635 NumBits = std::max(NumBits, ForcedAlignBits);
637 if (NumBits == 0) return; // No need to emit alignment.
638 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
639 O << TAI->getAlignDirective() << NumBits;
640 if (UseFillExpr) O << ",0x" << std::hex << FillValue << std::dec;
645 /// EmitZeros - Emit a block of zeros.
647 void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
649 if (TAI->getZeroDirective()) {
650 O << TAI->getZeroDirective() << NumZeros;
651 if (TAI->getZeroDirectiveSuffix())
652 O << TAI->getZeroDirectiveSuffix();
655 for (; NumZeros; --NumZeros)
656 O << TAI->getData8bitsDirective() << "0\n";
661 // Print out the specified constant, without a storage class. Only the
662 // constants valid in constant expressions can occur here.
663 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
664 if (CV->isNullValue() || isa<UndefValue>(CV))
666 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
667 O << CI->getZExtValue();
668 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
669 // This is a constant address for a global variable or function. Use the
670 // name of the variable or function as the address value, possibly
671 // decorating it with GlobalVarAddrPrefix/Suffix or
672 // FunctionAddrPrefix/Suffix (these all default to "" )
673 if (isa<Function>(GV)) {
674 O << TAI->getFunctionAddrPrefix()
675 << Mang->getValueName(GV)
676 << TAI->getFunctionAddrSuffix();
678 O << TAI->getGlobalVarAddrPrefix()
679 << Mang->getValueName(GV)
680 << TAI->getGlobalVarAddrSuffix();
682 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
683 const TargetData *TD = TM.getTargetData();
684 unsigned Opcode = CE->getOpcode();
686 case Instruction::GetElementPtr: {
687 // generate a symbolic expression for the byte address
688 const Constant *ptrVal = CE->getOperand(0);
689 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
690 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
694 EmitConstantValueOnly(ptrVal);
696 O << ") + " << Offset;
698 O << ") - " << -Offset;
700 EmitConstantValueOnly(ptrVal);
704 case Instruction::Trunc:
705 case Instruction::ZExt:
706 case Instruction::SExt:
707 case Instruction::FPTrunc:
708 case Instruction::FPExt:
709 case Instruction::UIToFP:
710 case Instruction::SIToFP:
711 case Instruction::FPToUI:
712 case Instruction::FPToSI:
713 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
715 case Instruction::BitCast:
716 return EmitConstantValueOnly(CE->getOperand(0));
718 case Instruction::IntToPtr: {
719 // Handle casts to pointers by changing them into casts to the appropriate
720 // integer type. This promotes constant folding and simplifies this code.
721 Constant *Op = CE->getOperand(0);
722 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
723 return EmitConstantValueOnly(Op);
727 case Instruction::PtrToInt: {
728 // Support only foldable casts to/from pointers that can be eliminated by
729 // changing the pointer to the appropriately sized integer type.
730 Constant *Op = CE->getOperand(0);
731 const Type *Ty = CE->getType();
733 // We can emit the pointer value into this slot if the slot is an
734 // integer slot greater or equal to the size of the pointer.
735 if (Ty->isInteger() &&
736 TD->getTypeSize(Ty) >= TD->getTypeSize(Op->getType()))
737 return EmitConstantValueOnly(Op);
739 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
740 EmitConstantValueOnly(Op);
743 case Instruction::Add:
744 case Instruction::Sub:
746 EmitConstantValueOnly(CE->getOperand(0));
747 O << (Opcode==Instruction::Add ? ") + (" : ") - (");
748 EmitConstantValueOnly(CE->getOperand(1));
752 assert(0 && "Unsupported operator!");
755 assert(0 && "Unknown constant value!");
759 /// printAsCString - Print the specified array as a C compatible string, only if
760 /// the predicate isString is true.
762 static void printAsCString(std::ostream &O, const ConstantArray *CVA,
764 assert(CVA->isString() && "Array is not string compatible!");
767 for (unsigned i = 0; i != LastElt; ++i) {
769 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
770 printStringChar(O, C);
775 /// EmitString - Emit a zero-byte-terminated string constant.
777 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
778 unsigned NumElts = CVA->getNumOperands();
779 if (TAI->getAscizDirective() && NumElts &&
780 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
781 O << TAI->getAscizDirective();
782 printAsCString(O, CVA, NumElts-1);
784 O << TAI->getAsciiDirective();
785 printAsCString(O, CVA, NumElts);
790 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
792 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
793 const TargetData *TD = TM.getTargetData();
795 if (CV->isNullValue() || isa<UndefValue>(CV)) {
796 EmitZeros(TD->getTypeSize(CV->getType()));
798 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
799 if (CVA->isString()) {
801 } else { // Not a string. Print the values in successive locations
802 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
803 EmitGlobalConstant(CVA->getOperand(i));
806 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
807 // Print the fields in successive locations. Pad to align if needed!
808 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
809 uint64_t sizeSoFar = 0;
810 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
811 const Constant* field = CVS->getOperand(i);
813 // Check if padding is needed and insert one or more 0s.
814 uint64_t fieldSize = TD->getTypeSize(field->getType());
815 uint64_t padSize = ((i == e-1? cvsLayout->getSizeInBytes()
816 : cvsLayout->getElementOffset(i+1))
817 - cvsLayout->getElementOffset(i)) - fieldSize;
818 sizeSoFar += fieldSize + padSize;
820 // Now print the actual field value
821 EmitGlobalConstant(field);
823 // Insert the field padding unless it's zero bytes...
826 assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
827 "Layout of constant struct may be incorrect!");
829 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
830 // FP Constants are printed as integer constants to avoid losing
832 if (CFP->getType() == Type::DoubleTy) {
833 double Val = CFP->getValueAPF().convertToDouble(); // for comment only
834 uint64_t i = CFP->getValueAPF().convertToAPInt().getZExtValue();
835 if (TAI->getData64bitsDirective())
836 O << TAI->getData64bitsDirective() << i << "\t"
837 << TAI->getCommentString() << " double value: " << Val << "\n";
838 else if (TD->isBigEndian()) {
839 O << TAI->getData32bitsDirective() << unsigned(i >> 32)
840 << "\t" << TAI->getCommentString()
841 << " double most significant word " << Val << "\n";
842 O << TAI->getData32bitsDirective() << unsigned(i)
843 << "\t" << TAI->getCommentString()
844 << " double least significant word " << Val << "\n";
846 O << TAI->getData32bitsDirective() << unsigned(i)
847 << "\t" << TAI->getCommentString()
848 << " double least significant word " << Val << "\n";
849 O << TAI->getData32bitsDirective() << unsigned(i >> 32)
850 << "\t" << TAI->getCommentString()
851 << " double most significant word " << Val << "\n";
854 } else if (CFP->getType() == Type::FloatTy) {
855 float Val = CFP->getValueAPF().convertToFloat(); // for comment only
856 O << TAI->getData32bitsDirective()
857 << CFP->getValueAPF().convertToAPInt().getZExtValue()
858 << "\t" << TAI->getCommentString() << " float " << Val << "\n";
860 } else if (CFP->getType() == Type::X86_FP80Ty) {
861 // all long double variants are printed as hex
862 const uint64_t *p = CFP->getValueAPF().convertToAPInt().getRawData();
863 if (TD->isBigEndian()) {
864 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 48)
865 << "\t" << TAI->getCommentString()
866 << " long double most significant halfword\n";
867 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 32)
868 << "\t" << TAI->getCommentString()
869 << " long double next halfword\n";
870 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 16)
871 << "\t" << TAI->getCommentString()
872 << " long double next halfword\n";
873 O << TAI->getData16bitsDirective() << uint16_t(p[0])
874 << "\t" << TAI->getCommentString()
875 << " long double next halfword\n";
876 O << TAI->getData16bitsDirective() << uint16_t(p[1])
877 << "\t" << TAI->getCommentString()
878 << " long double least significant halfword\n";
880 O << TAI->getData16bitsDirective() << uint16_t(p[1])
881 << "\t" << TAI->getCommentString()
882 << " long double least significant halfword\n";
883 O << TAI->getData16bitsDirective() << uint16_t(p[0])
884 << "\t" << TAI->getCommentString()
885 << " long double next halfword\n";
886 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 16)
887 << "\t" << TAI->getCommentString()
888 << " long double next halfword\n";
889 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 32)
890 << "\t" << TAI->getCommentString()
891 << " long double next halfword\n";
892 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 48)
893 << "\t" << TAI->getCommentString()
894 << " long double most significant halfword\n";
897 } else assert(0 && "Floating point constant type not handled");
898 } else if (CV->getType() == Type::Int64Ty) {
899 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
900 uint64_t Val = CI->getZExtValue();
902 if (TAI->getData64bitsDirective())
903 O << TAI->getData64bitsDirective() << Val << "\n";
904 else if (TD->isBigEndian()) {
905 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
906 << "\t" << TAI->getCommentString()
907 << " Double-word most significant word " << Val << "\n";
908 O << TAI->getData32bitsDirective() << unsigned(Val)
909 << "\t" << TAI->getCommentString()
910 << " Double-word least significant word " << Val << "\n";
912 O << TAI->getData32bitsDirective() << unsigned(Val)
913 << "\t" << TAI->getCommentString()
914 << " Double-word least significant word " << Val << "\n";
915 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
916 << "\t" << TAI->getCommentString()
917 << " Double-word most significant word " << Val << "\n";
921 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
922 const VectorType *PTy = CP->getType();
924 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
925 EmitGlobalConstant(CP->getOperand(I));
930 const Type *type = CV->getType();
931 printDataDirective(type);
932 EmitConstantValueOnly(CV);
937 AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
938 // Target doesn't support this yet!
942 /// PrintSpecial - Print information related to the specified machine instr
943 /// that is independent of the operand, and may be independent of the instr
944 /// itself. This can be useful for portably encoding the comment character
945 /// or other bits of target-specific knowledge into the asmstrings. The
946 /// syntax used is ${:comment}. Targets can override this to add support
947 /// for their own strange codes.
948 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
949 if (!strcmp(Code, "private")) {
950 O << TAI->getPrivateGlobalPrefix();
951 } else if (!strcmp(Code, "comment")) {
952 O << TAI->getCommentString();
953 } else if (!strcmp(Code, "uid")) {
954 // Assign a unique ID to this machine instruction.
955 static const MachineInstr *LastMI = 0;
956 static const Function *F = 0;
957 static unsigned Counter = 0U-1;
959 // Comparing the address of MI isn't sufficient, because machineinstrs may
960 // be allocated to the same address across functions.
961 const Function *ThisF = MI->getParent()->getParent()->getFunction();
963 // If this is a new machine instruction, bump the counter.
964 if (LastMI != MI || F != ThisF) {
971 cerr << "Unknown special formatter '" << Code
972 << "' for machine instr: " << *MI;
978 /// printInlineAsm - This method formats and prints the specified machine
979 /// instruction that is an inline asm.
980 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
981 unsigned NumOperands = MI->getNumOperands();
983 // Count the number of register definitions.
984 unsigned NumDefs = 0;
985 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
987 assert(NumDefs != NumOperands-1 && "No asm string?");
989 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
991 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
992 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
994 // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
995 if (AsmStr[0] == 0) {
996 O << "\n"; // Tab already printed, avoid double indenting next instr.
1000 O << TAI->getInlineAsmStart() << "\n\t";
1002 // The variant of the current asmprinter.
1003 int AsmPrinterVariant = TAI->getAssemblerDialect();
1005 int CurVariant = -1; // The number of the {.|.|.} region we are in.
1006 const char *LastEmitted = AsmStr; // One past the last character emitted.
1008 while (*LastEmitted) {
1009 switch (*LastEmitted) {
1011 // Not a special case, emit the string section literally.
1012 const char *LiteralEnd = LastEmitted+1;
1013 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1014 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1016 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1017 O.write(LastEmitted, LiteralEnd-LastEmitted);
1018 LastEmitted = LiteralEnd;
1022 ++LastEmitted; // Consume newline character.
1023 O << "\n"; // Indent code with newline.
1026 ++LastEmitted; // Consume '$' character.
1030 switch (*LastEmitted) {
1031 default: Done = false; break;
1032 case '$': // $$ -> $
1033 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1035 ++LastEmitted; // Consume second '$' character.
1037 case '(': // $( -> same as GCC's { character.
1038 ++LastEmitted; // Consume '(' character.
1039 if (CurVariant != -1) {
1040 cerr << "Nested variants found in inline asm string: '"
1044 CurVariant = 0; // We're in the first variant now.
1047 ++LastEmitted; // consume '|' character.
1048 if (CurVariant == -1) {
1049 cerr << "Found '|' character outside of variant in inline asm "
1050 << "string: '" << AsmStr << "'\n";
1053 ++CurVariant; // We're in the next variant.
1055 case ')': // $) -> same as GCC's } char.
1056 ++LastEmitted; // consume ')' character.
1057 if (CurVariant == -1) {
1058 cerr << "Found '}' character outside of variant in inline asm "
1059 << "string: '" << AsmStr << "'\n";
1067 bool HasCurlyBraces = false;
1068 if (*LastEmitted == '{') { // ${variable}
1069 ++LastEmitted; // Consume '{' character.
1070 HasCurlyBraces = true;
1073 const char *IDStart = LastEmitted;
1076 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1077 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1078 cerr << "Bad $ operand number in inline asm string: '"
1082 LastEmitted = IDEnd;
1084 char Modifier[2] = { 0, 0 };
1086 if (HasCurlyBraces) {
1087 // If we have curly braces, check for a modifier character. This
1088 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1089 if (*LastEmitted == ':') {
1090 ++LastEmitted; // Consume ':' character.
1091 if (*LastEmitted == 0) {
1092 cerr << "Bad ${:} expression in inline asm string: '"
1097 Modifier[0] = *LastEmitted;
1098 ++LastEmitted; // Consume modifier character.
1101 if (*LastEmitted != '}') {
1102 cerr << "Bad ${} expression in inline asm string: '"
1106 ++LastEmitted; // Consume '}' character.
1109 if ((unsigned)Val >= NumOperands-1) {
1110 cerr << "Invalid $ operand number in inline asm string: '"
1115 // Okay, we finally have a value number. Ask the target to print this
1117 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1122 // Scan to find the machine operand number for the operand.
1123 for (; Val; --Val) {
1124 if (OpNo >= MI->getNumOperands()) break;
1125 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1126 OpNo += (OpFlags >> 3) + 1;
1129 if (OpNo >= MI->getNumOperands()) {
1132 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1133 ++OpNo; // Skip over the ID number.
1135 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1136 if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
1137 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1138 Modifier[0] ? Modifier : 0);
1140 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1141 Modifier[0] ? Modifier : 0);
1145 cerr << "Invalid operand found in inline asm: '"
1155 O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
1158 /// printLabel - This method prints a local label used by debug and
1159 /// exception handling tables.
1160 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1162 << TAI->getPrivateGlobalPrefix()
1164 << MI->getOperand(0).getImmedValue()
1168 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1169 /// instruction, using the specified assembler variant. Targets should
1170 /// overried this to format as appropriate.
1171 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1172 unsigned AsmVariant, const char *ExtraCode) {
1173 // Target doesn't support this yet!
1177 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1178 unsigned AsmVariant,
1179 const char *ExtraCode) {
1180 // Target doesn't support this yet!
1184 /// printBasicBlockLabel - This method prints the label for the specified
1185 /// MachineBasicBlock
1186 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1188 bool printComment) const {
1189 O << TAI->getPrivateGlobalPrefix() << "BB" << FunctionNumber << "_"
1190 << MBB->getNumber();
1193 if (printComment && MBB->getBasicBlock())
1194 O << '\t' << TAI->getCommentString() << ' '
1195 << MBB->getBasicBlock()->getName();
1198 /// printSetLabel - This method prints a set label for the specified
1199 /// MachineBasicBlock
1200 void AsmPrinter::printSetLabel(unsigned uid,
1201 const MachineBasicBlock *MBB) const {
1202 if (!TAI->getSetDirective())
1205 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1206 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1207 printBasicBlockLabel(MBB, false, false);
1208 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1209 << '_' << uid << '\n';
1212 void AsmPrinter::printSetLabel(unsigned uid, unsigned uid2,
1213 const MachineBasicBlock *MBB) const {
1214 if (!TAI->getSetDirective())
1217 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1218 << getFunctionNumber() << '_' << uid << '_' << uid2
1219 << "_set_" << MBB->getNumber() << ',';
1220 printBasicBlockLabel(MBB, false, false);
1221 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1222 << '_' << uid << '_' << uid2 << '\n';
1225 /// printDataDirective - This method prints the asm directive for the
1227 void AsmPrinter::printDataDirective(const Type *type) {
1228 const TargetData *TD = TM.getTargetData();
1229 switch (type->getTypeID()) {
1230 case Type::IntegerTyID: {
1231 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1233 O << TAI->getData8bitsDirective();
1234 else if (BitWidth <= 16)
1235 O << TAI->getData16bitsDirective();
1236 else if (BitWidth <= 32)
1237 O << TAI->getData32bitsDirective();
1238 else if (BitWidth <= 64) {
1239 assert(TAI->getData64bitsDirective() &&
1240 "Target cannot handle 64-bit constant exprs!");
1241 O << TAI->getData64bitsDirective();
1245 case Type::PointerTyID:
1246 if (TD->getPointerSize() == 8) {
1247 assert(TAI->getData64bitsDirective() &&
1248 "Target cannot handle 64-bit pointer exprs!");
1249 O << TAI->getData64bitsDirective();
1251 O << TAI->getData32bitsDirective();
1254 case Type::FloatTyID: case Type::DoubleTyID:
1255 assert (0 && "Should have already output floating point constant.");
1257 assert (0 && "Can't handle printing this type of thing");