1 //===-- CBackend.cpp - Library for converting LLVM code to C --------------===//
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 // This library converts LLVM code to C code, compilable by GCC and other C
11 // compilers.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "CTargetMachine.h"
16 #include "llvm/CallingConv.h"
17 #include "llvm/Constants.h"
18 #include "llvm/DerivedTypes.h"
19 #include "llvm/Module.h"
20 #include "llvm/Instructions.h"
21 #include "llvm/Pass.h"
22 #include "llvm/PassManager.h"
23 #include "llvm/Intrinsics.h"
24 #include "llvm/IntrinsicInst.h"
25 #include "llvm/InlineAsm.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/ADT/SmallString.h"
28 #include "llvm/ADT/STLExtras.h"
29 #include "llvm/Analysis/ConstantsScanner.h"
30 #include "llvm/Analysis/FindUsedTypes.h"
31 #include "llvm/Analysis/LoopInfo.h"
32 #include "llvm/Analysis/ValueTracking.h"
33 #include "llvm/CodeGen/Passes.h"
34 #include "llvm/CodeGen/IntrinsicLowering.h"
35 #include "llvm/Target/Mangler.h"
36 #include "llvm/Transforms/Scalar.h"
37 #include "llvm/MC/MCAsmInfo.h"
38 #include "llvm/MC/MCContext.h"
39 #include "llvm/MC/MCInstrInfo.h"
40 #include "llvm/MC/MCObjectFileInfo.h"
41 #include "llvm/MC/MCRegisterInfo.h"
42 #include "llvm/MC/MCSubtargetInfo.h"
43 #include "llvm/MC/MCSymbol.h"
44 #include "llvm/Target/TargetData.h"
45 #include "llvm/Support/CallSite.h"
46 #include "llvm/Support/CFG.h"
47 #include "llvm/Support/ErrorHandling.h"
48 #include "llvm/Support/FormattedStream.h"
49 #include "llvm/Support/GetElementPtrTypeIterator.h"
50 #include "llvm/Support/InstVisitor.h"
51 #include "llvm/Support/MathExtras.h"
52 #include "llvm/Support/TargetRegistry.h"
53 #include "llvm/Support/Host.h"
54 #include "llvm/Config/config.h"
55 #include <algorithm>
56 // Some ms header decided to define setjmp as _setjmp, undo this for this file.
57 #ifdef _MSC_VER
58 #undef setjmp
59 #endif
60 using namespace llvm;
61
LLVMInitializeCBackendTarget()62 extern "C" void LLVMInitializeCBackendTarget() {
63 // Register the target.
64 RegisterTargetMachine<CTargetMachine> X(TheCBackendTarget);
65 }
66
67 namespace {
68 class CBEMCAsmInfo : public MCAsmInfo {
69 public:
CBEMCAsmInfo()70 CBEMCAsmInfo() {
71 GlobalPrefix = "";
72 PrivateGlobalPrefix = "";
73 }
74 };
75
76 /// CWriter - This class is the main chunk of code that converts an LLVM
77 /// module to a C translation unit.
78 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
79 formatted_raw_ostream &Out;
80 IntrinsicLowering *IL;
81 Mangler *Mang;
82 LoopInfo *LI;
83 const Module *TheModule;
84 const MCAsmInfo* TAsm;
85 const MCRegisterInfo *MRI;
86 const MCObjectFileInfo *MOFI;
87 MCContext *TCtx;
88 const TargetData* TD;
89
90 std::map<const ConstantFP *, unsigned> FPConstantMap;
91 std::set<Function*> intrinsicPrototypesAlreadyGenerated;
92 std::set<const Argument*> ByValParams;
93 unsigned FPCounter;
94 unsigned OpaqueCounter;
95 DenseMap<const Value*, unsigned> AnonValueNumbers;
96 unsigned NextAnonValueNumber;
97
98 /// UnnamedStructIDs - This contains a unique ID for each struct that is
99 /// either anonymous or has no name.
100 DenseMap<StructType*, unsigned> UnnamedStructIDs;
101
102 public:
103 static char ID;
CWriter(formatted_raw_ostream & o)104 explicit CWriter(formatted_raw_ostream &o)
105 : FunctionPass(ID), Out(o), IL(0), Mang(0), LI(0),
106 TheModule(0), TAsm(0), MRI(0), MOFI(0), TCtx(0), TD(0),
107 OpaqueCounter(0), NextAnonValueNumber(0) {
108 initializeLoopInfoPass(*PassRegistry::getPassRegistry());
109 FPCounter = 0;
110 }
111
getPassName() const112 virtual const char *getPassName() const { return "C backend"; }
113
getAnalysisUsage(AnalysisUsage & AU) const114 void getAnalysisUsage(AnalysisUsage &AU) const {
115 AU.addRequired<LoopInfo>();
116 AU.setPreservesAll();
117 }
118
119 virtual bool doInitialization(Module &M);
120
runOnFunction(Function & F)121 bool runOnFunction(Function &F) {
122 // Do not codegen any 'available_externally' functions at all, they have
123 // definitions outside the translation unit.
124 if (F.hasAvailableExternallyLinkage())
125 return false;
126
127 LI = &getAnalysis<LoopInfo>();
128
129 // Get rid of intrinsics we can't handle.
130 lowerIntrinsics(F);
131
132 // Output all floating point constants that cannot be printed accurately.
133 printFloatingPointConstants(F);
134
135 printFunction(F);
136 return false;
137 }
138
doFinalization(Module & M)139 virtual bool doFinalization(Module &M) {
140 // Free memory...
141 delete IL;
142 delete TD;
143 delete Mang;
144 delete TCtx;
145 delete TAsm;
146 delete MRI;
147 delete MOFI;
148 FPConstantMap.clear();
149 ByValParams.clear();
150 intrinsicPrototypesAlreadyGenerated.clear();
151 UnnamedStructIDs.clear();
152 return false;
153 }
154
155 raw_ostream &printType(raw_ostream &Out, Type *Ty,
156 bool isSigned = false,
157 const std::string &VariableName = "",
158 bool IgnoreName = false,
159 const AttrListPtr &PAL = AttrListPtr());
160 raw_ostream &printSimpleType(raw_ostream &Out, Type *Ty,
161 bool isSigned,
162 const std::string &NameSoFar = "");
163
164 void printStructReturnPointerFunctionType(raw_ostream &Out,
165 const AttrListPtr &PAL,
166 PointerType *Ty);
167
168 std::string getStructName(StructType *ST);
169
170 /// writeOperandDeref - Print the result of dereferencing the specified
171 /// operand with '*'. This is equivalent to printing '*' then using
172 /// writeOperand, but avoids excess syntax in some cases.
writeOperandDeref(Value * Operand)173 void writeOperandDeref(Value *Operand) {
174 if (isAddressExposed(Operand)) {
175 // Already something with an address exposed.
176 writeOperandInternal(Operand);
177 } else {
178 Out << "*(";
179 writeOperand(Operand);
180 Out << ")";
181 }
182 }
183
184 void writeOperand(Value *Operand, bool Static = false);
185 void writeInstComputationInline(Instruction &I);
186 void writeOperandInternal(Value *Operand, bool Static = false);
187 void writeOperandWithCast(Value* Operand, unsigned Opcode);
188 void writeOperandWithCast(Value* Operand, const ICmpInst &I);
189 bool writeInstructionCast(const Instruction &I);
190
191 void writeMemoryAccess(Value *Operand, Type *OperandType,
192 bool IsVolatile, unsigned Alignment);
193
194 private :
195 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
196
197 void lowerIntrinsics(Function &F);
198 /// Prints the definition of the intrinsic function F. Supports the
199 /// intrinsics which need to be explicitly defined in the CBackend.
200 void printIntrinsicDefinition(const Function &F, raw_ostream &Out);
201
202 void printModuleTypes();
203 void printContainedStructs(Type *Ty, SmallPtrSet<Type *, 16> &);
204 void printFloatingPointConstants(Function &F);
205 void printFloatingPointConstants(const Constant *C);
206 void printFunctionSignature(const Function *F, bool Prototype);
207
208 void printFunction(Function &);
209 void printBasicBlock(BasicBlock *BB);
210 void printLoop(Loop *L);
211
212 void printCast(unsigned opcode, Type *SrcTy, Type *DstTy);
213 void printConstant(Constant *CPV, bool Static);
214 void printConstantWithCast(Constant *CPV, unsigned Opcode);
215 bool printConstExprCast(const ConstantExpr *CE, bool Static);
216 void printConstantArray(ConstantArray *CPA, bool Static);
217 void printConstantVector(ConstantVector *CV, bool Static);
218
219 /// isAddressExposed - Return true if the specified value's name needs to
220 /// have its address taken in order to get a C value of the correct type.
221 /// This happens for global variables, byval parameters, and direct allocas.
isAddressExposed(const Value * V) const222 bool isAddressExposed(const Value *V) const {
223 if (const Argument *A = dyn_cast<Argument>(V))
224 return ByValParams.count(A);
225 return isa<GlobalVariable>(V) || isDirectAlloca(V);
226 }
227
228 // isInlinableInst - Attempt to inline instructions into their uses to build
229 // trees as much as possible. To do this, we have to consistently decide
230 // what is acceptable to inline, so that variable declarations don't get
231 // printed and an extra copy of the expr is not emitted.
232 //
isInlinableInst(const Instruction & I)233 static bool isInlinableInst(const Instruction &I) {
234 // Always inline cmp instructions, even if they are shared by multiple
235 // expressions. GCC generates horrible code if we don't.
236 if (isa<CmpInst>(I))
237 return true;
238
239 // Must be an expression, must be used exactly once. If it is dead, we
240 // emit it inline where it would go.
241 if (I.getType() == Type::getVoidTy(I.getContext()) || !I.hasOneUse() ||
242 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
243 isa<LoadInst>(I) || isa<VAArgInst>(I) || isa<InsertElementInst>(I) ||
244 isa<InsertValueInst>(I))
245 // Don't inline a load across a store or other bad things!
246 return false;
247
248 // Must not be used in inline asm, extractelement, or shufflevector.
249 if (I.hasOneUse()) {
250 const Instruction &User = cast<Instruction>(*I.use_back());
251 if (isInlineAsm(User) || isa<ExtractElementInst>(User) ||
252 isa<ShuffleVectorInst>(User))
253 return false;
254 }
255
256 // Only inline instruction it if it's use is in the same BB as the inst.
257 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
258 }
259
260 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
261 // variables which are accessed with the & operator. This causes GCC to
262 // generate significantly better code than to emit alloca calls directly.
263 //
isDirectAlloca(const Value * V)264 static const AllocaInst *isDirectAlloca(const Value *V) {
265 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
266 if (!AI) return 0;
267 if (AI->isArrayAllocation())
268 return 0; // FIXME: we can also inline fixed size array allocas!
269 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
270 return 0;
271 return AI;
272 }
273
274 // isInlineAsm - Check if the instruction is a call to an inline asm chunk.
isInlineAsm(const Instruction & I)275 static bool isInlineAsm(const Instruction& I) {
276 if (const CallInst *CI = dyn_cast<CallInst>(&I))
277 return isa<InlineAsm>(CI->getCalledValue());
278 return false;
279 }
280
281 // Instruction visitation functions
282 friend class InstVisitor<CWriter>;
283
284 void visitReturnInst(ReturnInst &I);
285 void visitBranchInst(BranchInst &I);
286 void visitSwitchInst(SwitchInst &I);
287 void visitIndirectBrInst(IndirectBrInst &I);
visitInvokeInst(InvokeInst & I)288 void visitInvokeInst(InvokeInst &I) {
289 llvm_unreachable("Lowerinvoke pass didn't work!");
290 }
visitUnwindInst(UnwindInst & I)291 void visitUnwindInst(UnwindInst &I) {
292 llvm_unreachable("Lowerinvoke pass didn't work!");
293 }
visitResumeInst(ResumeInst & I)294 void visitResumeInst(ResumeInst &I) {
295 llvm_unreachable("DwarfEHPrepare pass didn't work!");
296 }
297 void visitUnreachableInst(UnreachableInst &I);
298
299 void visitPHINode(PHINode &I);
300 void visitBinaryOperator(Instruction &I);
301 void visitICmpInst(ICmpInst &I);
302 void visitFCmpInst(FCmpInst &I);
303
304 void visitCastInst (CastInst &I);
305 void visitSelectInst(SelectInst &I);
306 void visitCallInst (CallInst &I);
307 void visitInlineAsm(CallInst &I);
308 bool visitBuiltinCall(CallInst &I, Intrinsic::ID ID, bool &WroteCallee);
309
310 void visitAllocaInst(AllocaInst &I);
311 void visitLoadInst (LoadInst &I);
312 void visitStoreInst (StoreInst &I);
313 void visitGetElementPtrInst(GetElementPtrInst &I);
314 void visitVAArgInst (VAArgInst &I);
315
316 void visitInsertElementInst(InsertElementInst &I);
317 void visitExtractElementInst(ExtractElementInst &I);
318 void visitShuffleVectorInst(ShuffleVectorInst &SVI);
319
320 void visitInsertValueInst(InsertValueInst &I);
321 void visitExtractValueInst(ExtractValueInst &I);
322
visitInstruction(Instruction & I)323 void visitInstruction(Instruction &I) {
324 #ifndef NDEBUG
325 errs() << "C Writer does not know about " << I;
326 #endif
327 llvm_unreachable(0);
328 }
329
outputLValue(Instruction * I)330 void outputLValue(Instruction *I) {
331 Out << " " << GetValueName(I) << " = ";
332 }
333
334 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
335 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
336 BasicBlock *Successor, unsigned Indent);
337 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
338 unsigned Indent);
339 void printGEPExpression(Value *Ptr, gep_type_iterator I,
340 gep_type_iterator E, bool Static);
341
342 std::string GetValueName(const Value *Operand);
343 };
344 }
345
346 char CWriter::ID = 0;
347
348
349
CBEMangle(const std::string & S)350 static std::string CBEMangle(const std::string &S) {
351 std::string Result;
352
353 for (unsigned i = 0, e = S.size(); i != e; ++i)
354 if (isalnum(S[i]) || S[i] == '_') {
355 Result += S[i];
356 } else {
357 Result += '_';
358 Result += 'A'+(S[i]&15);
359 Result += 'A'+((S[i]>>4)&15);
360 Result += '_';
361 }
362 return Result;
363 }
364
getStructName(StructType * ST)365 std::string CWriter::getStructName(StructType *ST) {
366 if (!ST->isLiteral() && !ST->getName().empty())
367 return CBEMangle("l_"+ST->getName().str());
368
369 return "l_unnamed_" + utostr(UnnamedStructIDs[ST]);
370 }
371
372
373 /// printStructReturnPointerFunctionType - This is like printType for a struct
374 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
375 /// print it as "Struct (*)(...)", for struct return functions.
printStructReturnPointerFunctionType(raw_ostream & Out,const AttrListPtr & PAL,PointerType * TheTy)376 void CWriter::printStructReturnPointerFunctionType(raw_ostream &Out,
377 const AttrListPtr &PAL,
378 PointerType *TheTy) {
379 FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
380 std::string tstr;
381 raw_string_ostream FunctionInnards(tstr);
382 FunctionInnards << " (*) (";
383 bool PrintedType = false;
384
385 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
386 Type *RetTy = cast<PointerType>(*I)->getElementType();
387 unsigned Idx = 1;
388 for (++I, ++Idx; I != E; ++I, ++Idx) {
389 if (PrintedType)
390 FunctionInnards << ", ";
391 Type *ArgTy = *I;
392 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
393 assert(ArgTy->isPointerTy());
394 ArgTy = cast<PointerType>(ArgTy)->getElementType();
395 }
396 printType(FunctionInnards, ArgTy,
397 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
398 PrintedType = true;
399 }
400 if (FTy->isVarArg()) {
401 if (!PrintedType)
402 FunctionInnards << " int"; //dummy argument for empty vararg functs
403 FunctionInnards << ", ...";
404 } else if (!PrintedType) {
405 FunctionInnards << "void";
406 }
407 FunctionInnards << ')';
408 printType(Out, RetTy,
409 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
410 }
411
412 raw_ostream &
printSimpleType(raw_ostream & Out,Type * Ty,bool isSigned,const std::string & NameSoFar)413 CWriter::printSimpleType(raw_ostream &Out, Type *Ty, bool isSigned,
414 const std::string &NameSoFar) {
415 assert((Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) &&
416 "Invalid type for printSimpleType");
417 switch (Ty->getTypeID()) {
418 case Type::VoidTyID: return Out << "void " << NameSoFar;
419 case Type::IntegerTyID: {
420 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
421 if (NumBits == 1)
422 return Out << "bool " << NameSoFar;
423 else if (NumBits <= 8)
424 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
425 else if (NumBits <= 16)
426 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
427 else if (NumBits <= 32)
428 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
429 else if (NumBits <= 64)
430 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
431 else {
432 assert(NumBits <= 128 && "Bit widths > 128 not implemented yet");
433 return Out << (isSigned?"llvmInt128":"llvmUInt128") << " " << NameSoFar;
434 }
435 }
436 case Type::FloatTyID: return Out << "float " << NameSoFar;
437 case Type::DoubleTyID: return Out << "double " << NameSoFar;
438 // Lacking emulation of FP80 on PPC, etc., we assume whichever of these is
439 // present matches host 'long double'.
440 case Type::X86_FP80TyID:
441 case Type::PPC_FP128TyID:
442 case Type::FP128TyID: return Out << "long double " << NameSoFar;
443
444 case Type::X86_MMXTyID:
445 return printSimpleType(Out, Type::getInt32Ty(Ty->getContext()), isSigned,
446 " __attribute__((vector_size(64))) " + NameSoFar);
447
448 case Type::VectorTyID: {
449 VectorType *VTy = cast<VectorType>(Ty);
450 return printSimpleType(Out, VTy->getElementType(), isSigned,
451 " __attribute__((vector_size(" +
452 utostr(TD->getTypeAllocSize(VTy)) + " ))) " + NameSoFar);
453 }
454
455 default:
456 #ifndef NDEBUG
457 errs() << "Unknown primitive type: " << *Ty << "\n";
458 #endif
459 llvm_unreachable(0);
460 }
461 }
462
463 // Pass the Type* and the variable name and this prints out the variable
464 // declaration.
465 //
printType(raw_ostream & Out,Type * Ty,bool isSigned,const std::string & NameSoFar,bool IgnoreName,const AttrListPtr & PAL)466 raw_ostream &CWriter::printType(raw_ostream &Out, Type *Ty,
467 bool isSigned, const std::string &NameSoFar,
468 bool IgnoreName, const AttrListPtr &PAL) {
469 if (Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) {
470 printSimpleType(Out, Ty, isSigned, NameSoFar);
471 return Out;
472 }
473
474 switch (Ty->getTypeID()) {
475 case Type::FunctionTyID: {
476 FunctionType *FTy = cast<FunctionType>(Ty);
477 std::string tstr;
478 raw_string_ostream FunctionInnards(tstr);
479 FunctionInnards << " (" << NameSoFar << ") (";
480 unsigned Idx = 1;
481 for (FunctionType::param_iterator I = FTy->param_begin(),
482 E = FTy->param_end(); I != E; ++I) {
483 Type *ArgTy = *I;
484 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
485 assert(ArgTy->isPointerTy());
486 ArgTy = cast<PointerType>(ArgTy)->getElementType();
487 }
488 if (I != FTy->param_begin())
489 FunctionInnards << ", ";
490 printType(FunctionInnards, ArgTy,
491 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
492 ++Idx;
493 }
494 if (FTy->isVarArg()) {
495 if (!FTy->getNumParams())
496 FunctionInnards << " int"; //dummy argument for empty vaarg functs
497 FunctionInnards << ", ...";
498 } else if (!FTy->getNumParams()) {
499 FunctionInnards << "void";
500 }
501 FunctionInnards << ')';
502 printType(Out, FTy->getReturnType(),
503 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
504 return Out;
505 }
506 case Type::StructTyID: {
507 StructType *STy = cast<StructType>(Ty);
508
509 // Check to see if the type is named.
510 if (!IgnoreName)
511 return Out << getStructName(STy) << ' ' << NameSoFar;
512
513 Out << NameSoFar + " {\n";
514 unsigned Idx = 0;
515 for (StructType::element_iterator I = STy->element_begin(),
516 E = STy->element_end(); I != E; ++I) {
517 Out << " ";
518 printType(Out, *I, false, "field" + utostr(Idx++));
519 Out << ";\n";
520 }
521 Out << '}';
522 if (STy->isPacked())
523 Out << " __attribute__ ((packed))";
524 return Out;
525 }
526
527 case Type::PointerTyID: {
528 PointerType *PTy = cast<PointerType>(Ty);
529 std::string ptrName = "*" + NameSoFar;
530
531 if (PTy->getElementType()->isArrayTy() ||
532 PTy->getElementType()->isVectorTy())
533 ptrName = "(" + ptrName + ")";
534
535 if (!PAL.isEmpty())
536 // Must be a function ptr cast!
537 return printType(Out, PTy->getElementType(), false, ptrName, true, PAL);
538 return printType(Out, PTy->getElementType(), false, ptrName);
539 }
540
541 case Type::ArrayTyID: {
542 ArrayType *ATy = cast<ArrayType>(Ty);
543 unsigned NumElements = ATy->getNumElements();
544 if (NumElements == 0) NumElements = 1;
545 // Arrays are wrapped in structs to allow them to have normal
546 // value semantics (avoiding the array "decay").
547 Out << NameSoFar << " { ";
548 printType(Out, ATy->getElementType(), false,
549 "array[" + utostr(NumElements) + "]");
550 return Out << "; }";
551 }
552
553 default:
554 llvm_unreachable("Unhandled case in getTypeProps!");
555 }
556
557 return Out;
558 }
559
printConstantArray(ConstantArray * CPA,bool Static)560 void CWriter::printConstantArray(ConstantArray *CPA, bool Static) {
561
562 // As a special case, print the array as a string if it is an array of
563 // ubytes or an array of sbytes with positive values.
564 //
565 Type *ETy = CPA->getType()->getElementType();
566 bool isString = (ETy == Type::getInt8Ty(CPA->getContext()) ||
567 ETy == Type::getInt8Ty(CPA->getContext()));
568
569 // Make sure the last character is a null char, as automatically added by C
570 if (isString && (CPA->getNumOperands() == 0 ||
571 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
572 isString = false;
573
574 if (isString) {
575 Out << '\"';
576 // Keep track of whether the last number was a hexadecimal escape.
577 bool LastWasHex = false;
578
579 // Do not include the last character, which we know is null
580 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
581 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
582
583 // Print it out literally if it is a printable character. The only thing
584 // to be careful about is when the last letter output was a hex escape
585 // code, in which case we have to be careful not to print out hex digits
586 // explicitly (the C compiler thinks it is a continuation of the previous
587 // character, sheesh...)
588 //
589 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
590 LastWasHex = false;
591 if (C == '"' || C == '\\')
592 Out << "\\" << (char)C;
593 else
594 Out << (char)C;
595 } else {
596 LastWasHex = false;
597 switch (C) {
598 case '\n': Out << "\\n"; break;
599 case '\t': Out << "\\t"; break;
600 case '\r': Out << "\\r"; break;
601 case '\v': Out << "\\v"; break;
602 case '\a': Out << "\\a"; break;
603 case '\"': Out << "\\\""; break;
604 case '\'': Out << "\\\'"; break;
605 default:
606 Out << "\\x";
607 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
608 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
609 LastWasHex = true;
610 break;
611 }
612 }
613 }
614 Out << '\"';
615 } else {
616 Out << '{';
617 if (CPA->getNumOperands()) {
618 Out << ' ';
619 printConstant(cast<Constant>(CPA->getOperand(0)), Static);
620 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
621 Out << ", ";
622 printConstant(cast<Constant>(CPA->getOperand(i)), Static);
623 }
624 }
625 Out << " }";
626 }
627 }
628
printConstantVector(ConstantVector * CP,bool Static)629 void CWriter::printConstantVector(ConstantVector *CP, bool Static) {
630 Out << '{';
631 if (CP->getNumOperands()) {
632 Out << ' ';
633 printConstant(cast<Constant>(CP->getOperand(0)), Static);
634 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
635 Out << ", ";
636 printConstant(cast<Constant>(CP->getOperand(i)), Static);
637 }
638 }
639 Out << " }";
640 }
641
642 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
643 // textually as a double (rather than as a reference to a stack-allocated
644 // variable). We decide this by converting CFP to a string and back into a
645 // double, and then checking whether the conversion results in a bit-equal
646 // double to the original value of CFP. This depends on us and the target C
647 // compiler agreeing on the conversion process (which is pretty likely since we
648 // only deal in IEEE FP).
649 //
isFPCSafeToPrint(const ConstantFP * CFP)650 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
651 bool ignored;
652 // Do long doubles in hex for now.
653 if (CFP->getType() != Type::getFloatTy(CFP->getContext()) &&
654 CFP->getType() != Type::getDoubleTy(CFP->getContext()))
655 return false;
656 APFloat APF = APFloat(CFP->getValueAPF()); // copy
657 if (CFP->getType() == Type::getFloatTy(CFP->getContext()))
658 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &ignored);
659 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
660 char Buffer[100];
661 sprintf(Buffer, "%a", APF.convertToDouble());
662 if (!strncmp(Buffer, "0x", 2) ||
663 !strncmp(Buffer, "-0x", 3) ||
664 !strncmp(Buffer, "+0x", 3))
665 return APF.bitwiseIsEqual(APFloat(atof(Buffer)));
666 return false;
667 #else
668 std::string StrVal = ftostr(APF);
669
670 while (StrVal[0] == ' ')
671 StrVal.erase(StrVal.begin());
672
673 // Check to make sure that the stringized number is not some string like "Inf"
674 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
675 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
676 ((StrVal[0] == '-' || StrVal[0] == '+') &&
677 (StrVal[1] >= '0' && StrVal[1] <= '9')))
678 // Reparse stringized version!
679 return APF.bitwiseIsEqual(APFloat(atof(StrVal.c_str())));
680 return false;
681 #endif
682 }
683
684 /// Print out the casting for a cast operation. This does the double casting
685 /// necessary for conversion to the destination type, if necessary.
686 /// @brief Print a cast
printCast(unsigned opc,Type * SrcTy,Type * DstTy)687 void CWriter::printCast(unsigned opc, Type *SrcTy, Type *DstTy) {
688 // Print the destination type cast
689 switch (opc) {
690 case Instruction::UIToFP:
691 case Instruction::SIToFP:
692 case Instruction::IntToPtr:
693 case Instruction::Trunc:
694 case Instruction::BitCast:
695 case Instruction::FPExt:
696 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
697 Out << '(';
698 printType(Out, DstTy);
699 Out << ')';
700 break;
701 case Instruction::ZExt:
702 case Instruction::PtrToInt:
703 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
704 Out << '(';
705 printSimpleType(Out, DstTy, false);
706 Out << ')';
707 break;
708 case Instruction::SExt:
709 case Instruction::FPToSI: // For these, make sure we get a signed dest
710 Out << '(';
711 printSimpleType(Out, DstTy, true);
712 Out << ')';
713 break;
714 default:
715 llvm_unreachable("Invalid cast opcode");
716 }
717
718 // Print the source type cast
719 switch (opc) {
720 case Instruction::UIToFP:
721 case Instruction::ZExt:
722 Out << '(';
723 printSimpleType(Out, SrcTy, false);
724 Out << ')';
725 break;
726 case Instruction::SIToFP:
727 case Instruction::SExt:
728 Out << '(';
729 printSimpleType(Out, SrcTy, true);
730 Out << ')';
731 break;
732 case Instruction::IntToPtr:
733 case Instruction::PtrToInt:
734 // Avoid "cast to pointer from integer of different size" warnings
735 Out << "(unsigned long)";
736 break;
737 case Instruction::Trunc:
738 case Instruction::BitCast:
739 case Instruction::FPExt:
740 case Instruction::FPTrunc:
741 case Instruction::FPToSI:
742 case Instruction::FPToUI:
743 break; // These don't need a source cast.
744 default:
745 llvm_unreachable("Invalid cast opcode");
746 break;
747 }
748 }
749
750 // printConstant - The LLVM Constant to C Constant converter.
printConstant(Constant * CPV,bool Static)751 void CWriter::printConstant(Constant *CPV, bool Static) {
752 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
753 switch (CE->getOpcode()) {
754 case Instruction::Trunc:
755 case Instruction::ZExt:
756 case Instruction::SExt:
757 case Instruction::FPTrunc:
758 case Instruction::FPExt:
759 case Instruction::UIToFP:
760 case Instruction::SIToFP:
761 case Instruction::FPToUI:
762 case Instruction::FPToSI:
763 case Instruction::PtrToInt:
764 case Instruction::IntToPtr:
765 case Instruction::BitCast:
766 Out << "(";
767 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
768 if (CE->getOpcode() == Instruction::SExt &&
769 CE->getOperand(0)->getType() == Type::getInt1Ty(CPV->getContext())) {
770 // Make sure we really sext from bool here by subtracting from 0
771 Out << "0-";
772 }
773 printConstant(CE->getOperand(0), Static);
774 if (CE->getType() == Type::getInt1Ty(CPV->getContext()) &&
775 (CE->getOpcode() == Instruction::Trunc ||
776 CE->getOpcode() == Instruction::FPToUI ||
777 CE->getOpcode() == Instruction::FPToSI ||
778 CE->getOpcode() == Instruction::PtrToInt)) {
779 // Make sure we really truncate to bool here by anding with 1
780 Out << "&1u";
781 }
782 Out << ')';
783 return;
784
785 case Instruction::GetElementPtr:
786 Out << "(";
787 printGEPExpression(CE->getOperand(0), gep_type_begin(CPV),
788 gep_type_end(CPV), Static);
789 Out << ")";
790 return;
791 case Instruction::Select:
792 Out << '(';
793 printConstant(CE->getOperand(0), Static);
794 Out << '?';
795 printConstant(CE->getOperand(1), Static);
796 Out << ':';
797 printConstant(CE->getOperand(2), Static);
798 Out << ')';
799 return;
800 case Instruction::Add:
801 case Instruction::FAdd:
802 case Instruction::Sub:
803 case Instruction::FSub:
804 case Instruction::Mul:
805 case Instruction::FMul:
806 case Instruction::SDiv:
807 case Instruction::UDiv:
808 case Instruction::FDiv:
809 case Instruction::URem:
810 case Instruction::SRem:
811 case Instruction::FRem:
812 case Instruction::And:
813 case Instruction::Or:
814 case Instruction::Xor:
815 case Instruction::ICmp:
816 case Instruction::Shl:
817 case Instruction::LShr:
818 case Instruction::AShr:
819 {
820 Out << '(';
821 bool NeedsClosingParens = printConstExprCast(CE, Static);
822 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
823 switch (CE->getOpcode()) {
824 case Instruction::Add:
825 case Instruction::FAdd: Out << " + "; break;
826 case Instruction::Sub:
827 case Instruction::FSub: Out << " - "; break;
828 case Instruction::Mul:
829 case Instruction::FMul: Out << " * "; break;
830 case Instruction::URem:
831 case Instruction::SRem:
832 case Instruction::FRem: Out << " % "; break;
833 case Instruction::UDiv:
834 case Instruction::SDiv:
835 case Instruction::FDiv: Out << " / "; break;
836 case Instruction::And: Out << " & "; break;
837 case Instruction::Or: Out << " | "; break;
838 case Instruction::Xor: Out << " ^ "; break;
839 case Instruction::Shl: Out << " << "; break;
840 case Instruction::LShr:
841 case Instruction::AShr: Out << " >> "; break;
842 case Instruction::ICmp:
843 switch (CE->getPredicate()) {
844 case ICmpInst::ICMP_EQ: Out << " == "; break;
845 case ICmpInst::ICMP_NE: Out << " != "; break;
846 case ICmpInst::ICMP_SLT:
847 case ICmpInst::ICMP_ULT: Out << " < "; break;
848 case ICmpInst::ICMP_SLE:
849 case ICmpInst::ICMP_ULE: Out << " <= "; break;
850 case ICmpInst::ICMP_SGT:
851 case ICmpInst::ICMP_UGT: Out << " > "; break;
852 case ICmpInst::ICMP_SGE:
853 case ICmpInst::ICMP_UGE: Out << " >= "; break;
854 default: llvm_unreachable("Illegal ICmp predicate");
855 }
856 break;
857 default: llvm_unreachable("Illegal opcode here!");
858 }
859 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
860 if (NeedsClosingParens)
861 Out << "))";
862 Out << ')';
863 return;
864 }
865 case Instruction::FCmp: {
866 Out << '(';
867 bool NeedsClosingParens = printConstExprCast(CE, Static);
868 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
869 Out << "0";
870 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
871 Out << "1";
872 else {
873 const char* op = 0;
874 switch (CE->getPredicate()) {
875 default: llvm_unreachable("Illegal FCmp predicate");
876 case FCmpInst::FCMP_ORD: op = "ord"; break;
877 case FCmpInst::FCMP_UNO: op = "uno"; break;
878 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
879 case FCmpInst::FCMP_UNE: op = "une"; break;
880 case FCmpInst::FCMP_ULT: op = "ult"; break;
881 case FCmpInst::FCMP_ULE: op = "ule"; break;
882 case FCmpInst::FCMP_UGT: op = "ugt"; break;
883 case FCmpInst::FCMP_UGE: op = "uge"; break;
884 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
885 case FCmpInst::FCMP_ONE: op = "one"; break;
886 case FCmpInst::FCMP_OLT: op = "olt"; break;
887 case FCmpInst::FCMP_OLE: op = "ole"; break;
888 case FCmpInst::FCMP_OGT: op = "ogt"; break;
889 case FCmpInst::FCMP_OGE: op = "oge"; break;
890 }
891 Out << "llvm_fcmp_" << op << "(";
892 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
893 Out << ", ";
894 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
895 Out << ")";
896 }
897 if (NeedsClosingParens)
898 Out << "))";
899 Out << ')';
900 return;
901 }
902 default:
903 #ifndef NDEBUG
904 errs() << "CWriter Error: Unhandled constant expression: "
905 << *CE << "\n";
906 #endif
907 llvm_unreachable(0);
908 }
909 } else if (isa<UndefValue>(CPV) && CPV->getType()->isSingleValueType()) {
910 Out << "((";
911 printType(Out, CPV->getType()); // sign doesn't matter
912 Out << ")/*UNDEF*/";
913 if (!CPV->getType()->isVectorTy()) {
914 Out << "0)";
915 } else {
916 Out << "{})";
917 }
918 return;
919 }
920
921 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
922 Type* Ty = CI->getType();
923 if (Ty == Type::getInt1Ty(CPV->getContext()))
924 Out << (CI->getZExtValue() ? '1' : '0');
925 else if (Ty == Type::getInt32Ty(CPV->getContext()))
926 Out << CI->getZExtValue() << 'u';
927 else if (Ty->getPrimitiveSizeInBits() > 32)
928 Out << CI->getZExtValue() << "ull";
929 else {
930 Out << "((";
931 printSimpleType(Out, Ty, false) << ')';
932 if (CI->isMinValue(true))
933 Out << CI->getZExtValue() << 'u';
934 else
935 Out << CI->getSExtValue();
936 Out << ')';
937 }
938 return;
939 }
940
941 switch (CPV->getType()->getTypeID()) {
942 case Type::FloatTyID:
943 case Type::DoubleTyID:
944 case Type::X86_FP80TyID:
945 case Type::PPC_FP128TyID:
946 case Type::FP128TyID: {
947 ConstantFP *FPC = cast<ConstantFP>(CPV);
948 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
949 if (I != FPConstantMap.end()) {
950 // Because of FP precision problems we must load from a stack allocated
951 // value that holds the value in hex.
952 Out << "(*(" << (FPC->getType() == Type::getFloatTy(CPV->getContext()) ?
953 "float" :
954 FPC->getType() == Type::getDoubleTy(CPV->getContext()) ?
955 "double" :
956 "long double")
957 << "*)&FPConstant" << I->second << ')';
958 } else {
959 double V;
960 if (FPC->getType() == Type::getFloatTy(CPV->getContext()))
961 V = FPC->getValueAPF().convertToFloat();
962 else if (FPC->getType() == Type::getDoubleTy(CPV->getContext()))
963 V = FPC->getValueAPF().convertToDouble();
964 else {
965 // Long double. Convert the number to double, discarding precision.
966 // This is not awesome, but it at least makes the CBE output somewhat
967 // useful.
968 APFloat Tmp = FPC->getValueAPF();
969 bool LosesInfo;
970 Tmp.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &LosesInfo);
971 V = Tmp.convertToDouble();
972 }
973
974 if (IsNAN(V)) {
975 // The value is NaN
976
977 // FIXME the actual NaN bits should be emitted.
978 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
979 // it's 0x7ff4.
980 const unsigned long QuietNaN = 0x7ff8UL;
981 //const unsigned long SignalNaN = 0x7ff4UL;
982
983 // We need to grab the first part of the FP #
984 char Buffer[100];
985
986 uint64_t ll = DoubleToBits(V);
987 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
988
989 std::string Num(&Buffer[0], &Buffer[6]);
990 unsigned long Val = strtoul(Num.c_str(), 0, 16);
991
992 if (FPC->getType() == Type::getFloatTy(FPC->getContext()))
993 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
994 << Buffer << "\") /*nan*/ ";
995 else
996 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
997 << Buffer << "\") /*nan*/ ";
998 } else if (IsInf(V)) {
999 // The value is Inf
1000 if (V < 0) Out << '-';
1001 Out << "LLVM_INF" <<
1002 (FPC->getType() == Type::getFloatTy(FPC->getContext()) ? "F" : "")
1003 << " /*inf*/ ";
1004 } else {
1005 std::string Num;
1006 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
1007 // Print out the constant as a floating point number.
1008 char Buffer[100];
1009 sprintf(Buffer, "%a", V);
1010 Num = Buffer;
1011 #else
1012 Num = ftostr(FPC->getValueAPF());
1013 #endif
1014 Out << Num;
1015 }
1016 }
1017 break;
1018 }
1019
1020 case Type::ArrayTyID:
1021 // Use C99 compound expression literal initializer syntax.
1022 if (!Static) {
1023 Out << "(";
1024 printType(Out, CPV->getType());
1025 Out << ")";
1026 }
1027 Out << "{ "; // Arrays are wrapped in struct types.
1028 if (ConstantArray *CA = dyn_cast<ConstantArray>(CPV)) {
1029 printConstantArray(CA, Static);
1030 } else {
1031 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1032 ArrayType *AT = cast<ArrayType>(CPV->getType());
1033 Out << '{';
1034 if (AT->getNumElements()) {
1035 Out << ' ';
1036 Constant *CZ = Constant::getNullValue(AT->getElementType());
1037 printConstant(CZ, Static);
1038 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
1039 Out << ", ";
1040 printConstant(CZ, Static);
1041 }
1042 }
1043 Out << " }";
1044 }
1045 Out << " }"; // Arrays are wrapped in struct types.
1046 break;
1047
1048 case Type::VectorTyID:
1049 // Use C99 compound expression literal initializer syntax.
1050 if (!Static) {
1051 Out << "(";
1052 printType(Out, CPV->getType());
1053 Out << ")";
1054 }
1055 if (ConstantVector *CV = dyn_cast<ConstantVector>(CPV)) {
1056 printConstantVector(CV, Static);
1057 } else {
1058 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1059 VectorType *VT = cast<VectorType>(CPV->getType());
1060 Out << "{ ";
1061 Constant *CZ = Constant::getNullValue(VT->getElementType());
1062 printConstant(CZ, Static);
1063 for (unsigned i = 1, e = VT->getNumElements(); i != e; ++i) {
1064 Out << ", ";
1065 printConstant(CZ, Static);
1066 }
1067 Out << " }";
1068 }
1069 break;
1070
1071 case Type::StructTyID:
1072 // Use C99 compound expression literal initializer syntax.
1073 if (!Static) {
1074 Out << "(";
1075 printType(Out, CPV->getType());
1076 Out << ")";
1077 }
1078 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
1079 StructType *ST = cast<StructType>(CPV->getType());
1080 Out << '{';
1081 if (ST->getNumElements()) {
1082 Out << ' ';
1083 printConstant(Constant::getNullValue(ST->getElementType(0)), Static);
1084 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
1085 Out << ", ";
1086 printConstant(Constant::getNullValue(ST->getElementType(i)), Static);
1087 }
1088 }
1089 Out << " }";
1090 } else {
1091 Out << '{';
1092 if (CPV->getNumOperands()) {
1093 Out << ' ';
1094 printConstant(cast<Constant>(CPV->getOperand(0)), Static);
1095 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
1096 Out << ", ";
1097 printConstant(cast<Constant>(CPV->getOperand(i)), Static);
1098 }
1099 }
1100 Out << " }";
1101 }
1102 break;
1103
1104 case Type::PointerTyID:
1105 if (isa<ConstantPointerNull>(CPV)) {
1106 Out << "((";
1107 printType(Out, CPV->getType()); // sign doesn't matter
1108 Out << ")/*NULL*/0)";
1109 break;
1110 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
1111 writeOperand(GV, Static);
1112 break;
1113 }
1114 // FALL THROUGH
1115 default:
1116 #ifndef NDEBUG
1117 errs() << "Unknown constant type: " << *CPV << "\n";
1118 #endif
1119 llvm_unreachable(0);
1120 }
1121 }
1122
1123 // Some constant expressions need to be casted back to the original types
1124 // because their operands were casted to the expected type. This function takes
1125 // care of detecting that case and printing the cast for the ConstantExpr.
printConstExprCast(const ConstantExpr * CE,bool Static)1126 bool CWriter::printConstExprCast(const ConstantExpr* CE, bool Static) {
1127 bool NeedsExplicitCast = false;
1128 Type *Ty = CE->getOperand(0)->getType();
1129 bool TypeIsSigned = false;
1130 switch (CE->getOpcode()) {
1131 case Instruction::Add:
1132 case Instruction::Sub:
1133 case Instruction::Mul:
1134 // We need to cast integer arithmetic so that it is always performed
1135 // as unsigned, to avoid undefined behavior on overflow.
1136 case Instruction::LShr:
1137 case Instruction::URem:
1138 case Instruction::UDiv: NeedsExplicitCast = true; break;
1139 case Instruction::AShr:
1140 case Instruction::SRem:
1141 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1142 case Instruction::SExt:
1143 Ty = CE->getType();
1144 NeedsExplicitCast = true;
1145 TypeIsSigned = true;
1146 break;
1147 case Instruction::ZExt:
1148 case Instruction::Trunc:
1149 case Instruction::FPTrunc:
1150 case Instruction::FPExt:
1151 case Instruction::UIToFP:
1152 case Instruction::SIToFP:
1153 case Instruction::FPToUI:
1154 case Instruction::FPToSI:
1155 case Instruction::PtrToInt:
1156 case Instruction::IntToPtr:
1157 case Instruction::BitCast:
1158 Ty = CE->getType();
1159 NeedsExplicitCast = true;
1160 break;
1161 default: break;
1162 }
1163 if (NeedsExplicitCast) {
1164 Out << "((";
1165 if (Ty->isIntegerTy() && Ty != Type::getInt1Ty(Ty->getContext()))
1166 printSimpleType(Out, Ty, TypeIsSigned);
1167 else
1168 printType(Out, Ty); // not integer, sign doesn't matter
1169 Out << ")(";
1170 }
1171 return NeedsExplicitCast;
1172 }
1173
1174 // Print a constant assuming that it is the operand for a given Opcode. The
1175 // opcodes that care about sign need to cast their operands to the expected
1176 // type before the operation proceeds. This function does the casting.
printConstantWithCast(Constant * CPV,unsigned Opcode)1177 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1178
1179 // Extract the operand's type, we'll need it.
1180 Type* OpTy = CPV->getType();
1181
1182 // Indicate whether to do the cast or not.
1183 bool shouldCast = false;
1184 bool typeIsSigned = false;
1185
1186 // Based on the Opcode for which this Constant is being written, determine
1187 // the new type to which the operand should be casted by setting the value
1188 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1189 // casted below.
1190 switch (Opcode) {
1191 default:
1192 // for most instructions, it doesn't matter
1193 break;
1194 case Instruction::Add:
1195 case Instruction::Sub:
1196 case Instruction::Mul:
1197 // We need to cast integer arithmetic so that it is always performed
1198 // as unsigned, to avoid undefined behavior on overflow.
1199 case Instruction::LShr:
1200 case Instruction::UDiv:
1201 case Instruction::URem:
1202 shouldCast = true;
1203 break;
1204 case Instruction::AShr:
1205 case Instruction::SDiv:
1206 case Instruction::SRem:
1207 shouldCast = true;
1208 typeIsSigned = true;
1209 break;
1210 }
1211
1212 // Write out the casted constant if we should, otherwise just write the
1213 // operand.
1214 if (shouldCast) {
1215 Out << "((";
1216 printSimpleType(Out, OpTy, typeIsSigned);
1217 Out << ")";
1218 printConstant(CPV, false);
1219 Out << ")";
1220 } else
1221 printConstant(CPV, false);
1222 }
1223
GetValueName(const Value * Operand)1224 std::string CWriter::GetValueName(const Value *Operand) {
1225
1226 // Resolve potential alias.
1227 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(Operand)) {
1228 if (const Value *V = GA->resolveAliasedGlobal(false))
1229 Operand = V;
1230 }
1231
1232 // Mangle globals with the standard mangler interface for LLC compatibility.
1233 if (const GlobalValue *GV = dyn_cast<GlobalValue>(Operand)) {
1234 SmallString<128> Str;
1235 Mang->getNameWithPrefix(Str, GV, false);
1236 return CBEMangle(Str.str().str());
1237 }
1238
1239 std::string Name = Operand->getName();
1240
1241 if (Name.empty()) { // Assign unique names to local temporaries.
1242 unsigned &No = AnonValueNumbers[Operand];
1243 if (No == 0)
1244 No = ++NextAnonValueNumber;
1245 Name = "tmp__" + utostr(No);
1246 }
1247
1248 std::string VarName;
1249 VarName.reserve(Name.capacity());
1250
1251 for (std::string::iterator I = Name.begin(), E = Name.end();
1252 I != E; ++I) {
1253 char ch = *I;
1254
1255 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1256 (ch >= '0' && ch <= '9') || ch == '_')) {
1257 char buffer[5];
1258 sprintf(buffer, "_%x_", ch);
1259 VarName += buffer;
1260 } else
1261 VarName += ch;
1262 }
1263
1264 return "llvm_cbe_" + VarName;
1265 }
1266
1267 /// writeInstComputationInline - Emit the computation for the specified
1268 /// instruction inline, with no destination provided.
writeInstComputationInline(Instruction & I)1269 void CWriter::writeInstComputationInline(Instruction &I) {
1270 // We can't currently support integer types other than 1, 8, 16, 32, 64.
1271 // Validate this.
1272 Type *Ty = I.getType();
1273 if (Ty->isIntegerTy() && (Ty!=Type::getInt1Ty(I.getContext()) &&
1274 Ty!=Type::getInt8Ty(I.getContext()) &&
1275 Ty!=Type::getInt16Ty(I.getContext()) &&
1276 Ty!=Type::getInt32Ty(I.getContext()) &&
1277 Ty!=Type::getInt64Ty(I.getContext()))) {
1278 report_fatal_error("The C backend does not currently support integer "
1279 "types of widths other than 1, 8, 16, 32, 64.\n"
1280 "This is being tracked as PR 4158.");
1281 }
1282
1283 // If this is a non-trivial bool computation, make sure to truncate down to
1284 // a 1 bit value. This is important because we want "add i1 x, y" to return
1285 // "0" when x and y are true, not "2" for example.
1286 bool NeedBoolTrunc = false;
1287 if (I.getType() == Type::getInt1Ty(I.getContext()) &&
1288 !isa<ICmpInst>(I) && !isa<FCmpInst>(I))
1289 NeedBoolTrunc = true;
1290
1291 if (NeedBoolTrunc)
1292 Out << "((";
1293
1294 visit(I);
1295
1296 if (NeedBoolTrunc)
1297 Out << ")&1)";
1298 }
1299
1300
writeOperandInternal(Value * Operand,bool Static)1301 void CWriter::writeOperandInternal(Value *Operand, bool Static) {
1302 if (Instruction *I = dyn_cast<Instruction>(Operand))
1303 // Should we inline this instruction to build a tree?
1304 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1305 Out << '(';
1306 writeInstComputationInline(*I);
1307 Out << ')';
1308 return;
1309 }
1310
1311 Constant* CPV = dyn_cast<Constant>(Operand);
1312
1313 if (CPV && !isa<GlobalValue>(CPV))
1314 printConstant(CPV, Static);
1315 else
1316 Out << GetValueName(Operand);
1317 }
1318
writeOperand(Value * Operand,bool Static)1319 void CWriter::writeOperand(Value *Operand, bool Static) {
1320 bool isAddressImplicit = isAddressExposed(Operand);
1321 if (isAddressImplicit)
1322 Out << "(&"; // Global variables are referenced as their addresses by llvm
1323
1324 writeOperandInternal(Operand, Static);
1325
1326 if (isAddressImplicit)
1327 Out << ')';
1328 }
1329
1330 // Some instructions need to have their result value casted back to the
1331 // original types because their operands were casted to the expected type.
1332 // This function takes care of detecting that case and printing the cast
1333 // for the Instruction.
writeInstructionCast(const Instruction & I)1334 bool CWriter::writeInstructionCast(const Instruction &I) {
1335 Type *Ty = I.getOperand(0)->getType();
1336 switch (I.getOpcode()) {
1337 case Instruction::Add:
1338 case Instruction::Sub:
1339 case Instruction::Mul:
1340 // We need to cast integer arithmetic so that it is always performed
1341 // as unsigned, to avoid undefined behavior on overflow.
1342 case Instruction::LShr:
1343 case Instruction::URem:
1344 case Instruction::UDiv:
1345 Out << "((";
1346 printSimpleType(Out, Ty, false);
1347 Out << ")(";
1348 return true;
1349 case Instruction::AShr:
1350 case Instruction::SRem:
1351 case Instruction::SDiv:
1352 Out << "((";
1353 printSimpleType(Out, Ty, true);
1354 Out << ")(";
1355 return true;
1356 default: break;
1357 }
1358 return false;
1359 }
1360
1361 // Write the operand with a cast to another type based on the Opcode being used.
1362 // This will be used in cases where an instruction has specific type
1363 // requirements (usually signedness) for its operands.
writeOperandWithCast(Value * Operand,unsigned Opcode)1364 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1365
1366 // Extract the operand's type, we'll need it.
1367 Type* OpTy = Operand->getType();
1368
1369 // Indicate whether to do the cast or not.
1370 bool shouldCast = false;
1371
1372 // Indicate whether the cast should be to a signed type or not.
1373 bool castIsSigned = false;
1374
1375 // Based on the Opcode for which this Operand is being written, determine
1376 // the new type to which the operand should be casted by setting the value
1377 // of OpTy. If we change OpTy, also set shouldCast to true.
1378 switch (Opcode) {
1379 default:
1380 // for most instructions, it doesn't matter
1381 break;
1382 case Instruction::Add:
1383 case Instruction::Sub:
1384 case Instruction::Mul:
1385 // We need to cast integer arithmetic so that it is always performed
1386 // as unsigned, to avoid undefined behavior on overflow.
1387 case Instruction::LShr:
1388 case Instruction::UDiv:
1389 case Instruction::URem: // Cast to unsigned first
1390 shouldCast = true;
1391 castIsSigned = false;
1392 break;
1393 case Instruction::GetElementPtr:
1394 case Instruction::AShr:
1395 case Instruction::SDiv:
1396 case Instruction::SRem: // Cast to signed first
1397 shouldCast = true;
1398 castIsSigned = true;
1399 break;
1400 }
1401
1402 // Write out the casted operand if we should, otherwise just write the
1403 // operand.
1404 if (shouldCast) {
1405 Out << "((";
1406 printSimpleType(Out, OpTy, castIsSigned);
1407 Out << ")";
1408 writeOperand(Operand);
1409 Out << ")";
1410 } else
1411 writeOperand(Operand);
1412 }
1413
1414 // Write the operand with a cast to another type based on the icmp predicate
1415 // being used.
writeOperandWithCast(Value * Operand,const ICmpInst & Cmp)1416 void CWriter::writeOperandWithCast(Value* Operand, const ICmpInst &Cmp) {
1417 // This has to do a cast to ensure the operand has the right signedness.
1418 // Also, if the operand is a pointer, we make sure to cast to an integer when
1419 // doing the comparison both for signedness and so that the C compiler doesn't
1420 // optimize things like "p < NULL" to false (p may contain an integer value
1421 // f.e.).
1422 bool shouldCast = Cmp.isRelational();
1423
1424 // Write out the casted operand if we should, otherwise just write the
1425 // operand.
1426 if (!shouldCast) {
1427 writeOperand(Operand);
1428 return;
1429 }
1430
1431 // Should this be a signed comparison? If so, convert to signed.
1432 bool castIsSigned = Cmp.isSigned();
1433
1434 // If the operand was a pointer, convert to a large integer type.
1435 Type* OpTy = Operand->getType();
1436 if (OpTy->isPointerTy())
1437 OpTy = TD->getIntPtrType(Operand->getContext());
1438
1439 Out << "((";
1440 printSimpleType(Out, OpTy, castIsSigned);
1441 Out << ")";
1442 writeOperand(Operand);
1443 Out << ")";
1444 }
1445
1446 // generateCompilerSpecificCode - This is where we add conditional compilation
1447 // directives to cater to specific compilers as need be.
1448 //
generateCompilerSpecificCode(formatted_raw_ostream & Out,const TargetData * TD)1449 static void generateCompilerSpecificCode(formatted_raw_ostream& Out,
1450 const TargetData *TD) {
1451 // Alloca is hard to get, and we don't want to include stdlib.h here.
1452 Out << "/* get a declaration for alloca */\n"
1453 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1454 << "#define alloca(x) __builtin_alloca((x))\n"
1455 << "#define _alloca(x) __builtin_alloca((x))\n"
1456 << "#elif defined(__APPLE__)\n"
1457 << "extern void *__builtin_alloca(unsigned long);\n"
1458 << "#define alloca(x) __builtin_alloca(x)\n"
1459 << "#define longjmp _longjmp\n"
1460 << "#define setjmp _setjmp\n"
1461 << "#elif defined(__sun__)\n"
1462 << "#if defined(__sparcv9)\n"
1463 << "extern void *__builtin_alloca(unsigned long);\n"
1464 << "#else\n"
1465 << "extern void *__builtin_alloca(unsigned int);\n"
1466 << "#endif\n"
1467 << "#define alloca(x) __builtin_alloca(x)\n"
1468 << "#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__arm__)\n"
1469 << "#define alloca(x) __builtin_alloca(x)\n"
1470 << "#elif defined(_MSC_VER)\n"
1471 << "#define inline _inline\n"
1472 << "#define alloca(x) _alloca(x)\n"
1473 << "#else\n"
1474 << "#include <alloca.h>\n"
1475 << "#endif\n\n";
1476
1477 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1478 // If we aren't being compiled with GCC, just drop these attributes.
1479 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1480 << "#define __attribute__(X)\n"
1481 << "#endif\n\n";
1482
1483 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1484 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1485 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1486 << "#elif defined(__GNUC__)\n"
1487 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1488 << "#else\n"
1489 << "#define __EXTERNAL_WEAK__\n"
1490 << "#endif\n\n";
1491
1492 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1493 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1494 << "#define __ATTRIBUTE_WEAK__\n"
1495 << "#elif defined(__GNUC__)\n"
1496 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1497 << "#else\n"
1498 << "#define __ATTRIBUTE_WEAK__\n"
1499 << "#endif\n\n";
1500
1501 // Add hidden visibility support. FIXME: APPLE_CC?
1502 Out << "#if defined(__GNUC__)\n"
1503 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1504 << "#endif\n\n";
1505
1506 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1507 // From the GCC documentation:
1508 //
1509 // double __builtin_nan (const char *str)
1510 //
1511 // This is an implementation of the ISO C99 function nan.
1512 //
1513 // Since ISO C99 defines this function in terms of strtod, which we do
1514 // not implement, a description of the parsing is in order. The string is
1515 // parsed as by strtol; that is, the base is recognized by leading 0 or
1516 // 0x prefixes. The number parsed is placed in the significand such that
1517 // the least significant bit of the number is at the least significant
1518 // bit of the significand. The number is truncated to fit the significand
1519 // field provided. The significand is forced to be a quiet NaN.
1520 //
1521 // This function, if given a string literal, is evaluated early enough
1522 // that it is considered a compile-time constant.
1523 //
1524 // float __builtin_nanf (const char *str)
1525 //
1526 // Similar to __builtin_nan, except the return type is float.
1527 //
1528 // double __builtin_inf (void)
1529 //
1530 // Similar to __builtin_huge_val, except a warning is generated if the
1531 // target floating-point format does not support infinities. This
1532 // function is suitable for implementing the ISO C99 macro INFINITY.
1533 //
1534 // float __builtin_inff (void)
1535 //
1536 // Similar to __builtin_inf, except the return type is float.
1537 Out << "#ifdef __GNUC__\n"
1538 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1539 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1540 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1541 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1542 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1543 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1544 << "#define LLVM_PREFETCH(addr,rw,locality) "
1545 "__builtin_prefetch(addr,rw,locality)\n"
1546 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1547 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1548 << "#define LLVM_ASM __asm__\n"
1549 << "#else\n"
1550 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1551 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1552 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1553 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1554 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1555 << "#define LLVM_INFF 0.0F /* Float */\n"
1556 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1557 << "#define __ATTRIBUTE_CTOR__\n"
1558 << "#define __ATTRIBUTE_DTOR__\n"
1559 << "#define LLVM_ASM(X)\n"
1560 << "#endif\n\n";
1561
1562 Out << "#if __GNUC__ < 4 /* Old GCC's, or compilers not GCC */ \n"
1563 << "#define __builtin_stack_save() 0 /* not implemented */\n"
1564 << "#define __builtin_stack_restore(X) /* noop */\n"
1565 << "#endif\n\n";
1566
1567 // Output typedefs for 128-bit integers. If these are needed with a
1568 // 32-bit target or with a C compiler that doesn't support mode(TI),
1569 // more drastic measures will be needed.
1570 Out << "#if __GNUC__ && __LP64__ /* 128-bit integer types */\n"
1571 << "typedef int __attribute__((mode(TI))) llvmInt128;\n"
1572 << "typedef unsigned __attribute__((mode(TI))) llvmUInt128;\n"
1573 << "#endif\n\n";
1574
1575 // Output target-specific code that should be inserted into main.
1576 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1577 }
1578
1579 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1580 /// the StaticTors set.
FindStaticTors(GlobalVariable * GV,std::set<Function * > & StaticTors)1581 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1582 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1583 if (!InitList) return;
1584
1585 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1586 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1587 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1588
1589 if (CS->getOperand(1)->isNullValue())
1590 return; // Found a null terminator, exit printing.
1591 Constant *FP = CS->getOperand(1);
1592 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1593 if (CE->isCast())
1594 FP = CE->getOperand(0);
1595 if (Function *F = dyn_cast<Function>(FP))
1596 StaticTors.insert(F);
1597 }
1598 }
1599
1600 enum SpecialGlobalClass {
1601 NotSpecial = 0,
1602 GlobalCtors, GlobalDtors,
1603 NotPrinted
1604 };
1605
1606 /// getGlobalVariableClass - If this is a global that is specially recognized
1607 /// by LLVM, return a code that indicates how we should handle it.
getGlobalVariableClass(const GlobalVariable * GV)1608 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1609 // If this is a global ctors/dtors list, handle it now.
1610 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1611 if (GV->getName() == "llvm.global_ctors")
1612 return GlobalCtors;
1613 else if (GV->getName() == "llvm.global_dtors")
1614 return GlobalDtors;
1615 }
1616
1617 // Otherwise, if it is other metadata, don't print it. This catches things
1618 // like debug information.
1619 if (GV->getSection() == "llvm.metadata")
1620 return NotPrinted;
1621
1622 return NotSpecial;
1623 }
1624
1625 // PrintEscapedString - Print each character of the specified string, escaping
1626 // it if it is not printable or if it is an escape char.
PrintEscapedString(const char * Str,unsigned Length,raw_ostream & Out)1627 static void PrintEscapedString(const char *Str, unsigned Length,
1628 raw_ostream &Out) {
1629 for (unsigned i = 0; i != Length; ++i) {
1630 unsigned char C = Str[i];
1631 if (isprint(C) && C != '\\' && C != '"')
1632 Out << C;
1633 else if (C == '\\')
1634 Out << "\\\\";
1635 else if (C == '\"')
1636 Out << "\\\"";
1637 else if (C == '\t')
1638 Out << "\\t";
1639 else
1640 Out << "\\x" << hexdigit(C >> 4) << hexdigit(C & 0x0F);
1641 }
1642 }
1643
1644 // PrintEscapedString - Print each character of the specified string, escaping
1645 // it if it is not printable or if it is an escape char.
PrintEscapedString(const std::string & Str,raw_ostream & Out)1646 static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
1647 PrintEscapedString(Str.c_str(), Str.size(), Out);
1648 }
1649
doInitialization(Module & M)1650 bool CWriter::doInitialization(Module &M) {
1651 FunctionPass::doInitialization(M);
1652
1653 // Initialize
1654 TheModule = &M;
1655
1656 TD = new TargetData(&M);
1657 IL = new IntrinsicLowering(*TD);
1658 IL->AddPrototypes(M);
1659
1660 #if 0
1661 std::string Triple = TheModule->getTargetTriple();
1662 if (Triple.empty())
1663 Triple = llvm::sys::getHostTriple();
1664
1665 std::string E;
1666 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
1667 TAsm = Match->createMCAsmInfo(Triple);
1668 #endif
1669 TAsm = new CBEMCAsmInfo();
1670 MRI = new MCRegisterInfo();
1671 TCtx = new MCContext(*TAsm, *MRI, NULL);
1672 Mang = new Mangler(*TCtx, *TD);
1673
1674 // Keep track of which functions are static ctors/dtors so they can have
1675 // an attribute added to their prototypes.
1676 std::set<Function*> StaticCtors, StaticDtors;
1677 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1678 I != E; ++I) {
1679 switch (getGlobalVariableClass(I)) {
1680 default: break;
1681 case GlobalCtors:
1682 FindStaticTors(I, StaticCtors);
1683 break;
1684 case GlobalDtors:
1685 FindStaticTors(I, StaticDtors);
1686 break;
1687 }
1688 }
1689
1690 // get declaration for alloca
1691 Out << "/* Provide Declarations */\n";
1692 Out << "#include <stdarg.h>\n"; // Varargs support
1693 Out << "#include <setjmp.h>\n"; // Unwind support
1694 Out << "#include <limits.h>\n"; // With overflow intrinsics support.
1695 generateCompilerSpecificCode(Out, TD);
1696
1697 // Provide a definition for `bool' if not compiling with a C++ compiler.
1698 Out << "\n"
1699 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1700
1701 << "\n\n/* Support for floating point constants */\n"
1702 << "typedef unsigned long long ConstantDoubleTy;\n"
1703 << "typedef unsigned int ConstantFloatTy;\n"
1704 << "typedef struct { unsigned long long f1; unsigned short f2; "
1705 "unsigned short pad[3]; } ConstantFP80Ty;\n"
1706 // This is used for both kinds of 128-bit long double; meaning differs.
1707 << "typedef struct { unsigned long long f1; unsigned long long f2; }"
1708 " ConstantFP128Ty;\n"
1709 << "\n\n/* Global Declarations */\n";
1710
1711 // First output all the declarations for the program, because C requires
1712 // Functions & globals to be declared before they are used.
1713 //
1714 if (!M.getModuleInlineAsm().empty()) {
1715 Out << "/* Module asm statements */\n"
1716 << "asm(";
1717
1718 // Split the string into lines, to make it easier to read the .ll file.
1719 std::string Asm = M.getModuleInlineAsm();
1720 size_t CurPos = 0;
1721 size_t NewLine = Asm.find_first_of('\n', CurPos);
1722 while (NewLine != std::string::npos) {
1723 // We found a newline, print the portion of the asm string from the
1724 // last newline up to this newline.
1725 Out << "\"";
1726 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.begin()+NewLine),
1727 Out);
1728 Out << "\\n\"\n";
1729 CurPos = NewLine+1;
1730 NewLine = Asm.find_first_of('\n', CurPos);
1731 }
1732 Out << "\"";
1733 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.end()), Out);
1734 Out << "\");\n"
1735 << "/* End Module asm statements */\n";
1736 }
1737
1738 // Loop over the symbol table, emitting all named constants.
1739 printModuleTypes();
1740
1741 // Global variable declarations...
1742 if (!M.global_empty()) {
1743 Out << "\n/* External Global Variable Declarations */\n";
1744 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1745 I != E; ++I) {
1746
1747 if (I->hasExternalLinkage() || I->hasExternalWeakLinkage() ||
1748 I->hasCommonLinkage())
1749 Out << "extern ";
1750 else if (I->hasDLLImportLinkage())
1751 Out << "__declspec(dllimport) ";
1752 else
1753 continue; // Internal Global
1754
1755 // Thread Local Storage
1756 if (I->isThreadLocal())
1757 Out << "__thread ";
1758
1759 printType(Out, I->getType()->getElementType(), false, GetValueName(I));
1760
1761 if (I->hasExternalWeakLinkage())
1762 Out << " __EXTERNAL_WEAK__";
1763 Out << ";\n";
1764 }
1765 }
1766
1767 // Function declarations
1768 Out << "\n/* Function Declarations */\n";
1769 Out << "double fmod(double, double);\n"; // Support for FP rem
1770 Out << "float fmodf(float, float);\n";
1771 Out << "long double fmodl(long double, long double);\n";
1772
1773 // Store the intrinsics which will be declared/defined below.
1774 SmallVector<const Function*, 8> intrinsicsToDefine;
1775
1776 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1777 // Don't print declarations for intrinsic functions.
1778 // Store the used intrinsics, which need to be explicitly defined.
1779 if (I->isIntrinsic()) {
1780 switch (I->getIntrinsicID()) {
1781 default:
1782 break;
1783 case Intrinsic::uadd_with_overflow:
1784 case Intrinsic::sadd_with_overflow:
1785 intrinsicsToDefine.push_back(I);
1786 break;
1787 }
1788 continue;
1789 }
1790
1791 if (I->getName() == "setjmp" ||
1792 I->getName() == "longjmp" || I->getName() == "_setjmp")
1793 continue;
1794
1795 if (I->hasExternalWeakLinkage())
1796 Out << "extern ";
1797 printFunctionSignature(I, true);
1798 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1799 Out << " __ATTRIBUTE_WEAK__";
1800 if (I->hasExternalWeakLinkage())
1801 Out << " __EXTERNAL_WEAK__";
1802 if (StaticCtors.count(I))
1803 Out << " __ATTRIBUTE_CTOR__";
1804 if (StaticDtors.count(I))
1805 Out << " __ATTRIBUTE_DTOR__";
1806 if (I->hasHiddenVisibility())
1807 Out << " __HIDDEN__";
1808
1809 if (I->hasName() && I->getName()[0] == 1)
1810 Out << " LLVM_ASM(\"" << I->getName().substr(1) << "\")";
1811
1812 Out << ";\n";
1813 }
1814
1815 // Output the global variable declarations
1816 if (!M.global_empty()) {
1817 Out << "\n\n/* Global Variable Declarations */\n";
1818 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1819 I != E; ++I)
1820 if (!I->isDeclaration()) {
1821 // Ignore special globals, such as debug info.
1822 if (getGlobalVariableClass(I))
1823 continue;
1824
1825 if (I->hasLocalLinkage())
1826 Out << "static ";
1827 else
1828 Out << "extern ";
1829
1830 // Thread Local Storage
1831 if (I->isThreadLocal())
1832 Out << "__thread ";
1833
1834 printType(Out, I->getType()->getElementType(), false,
1835 GetValueName(I));
1836
1837 if (I->hasLinkOnceLinkage())
1838 Out << " __attribute__((common))";
1839 else if (I->hasCommonLinkage()) // FIXME is this right?
1840 Out << " __ATTRIBUTE_WEAK__";
1841 else if (I->hasWeakLinkage())
1842 Out << " __ATTRIBUTE_WEAK__";
1843 else if (I->hasExternalWeakLinkage())
1844 Out << " __EXTERNAL_WEAK__";
1845 if (I->hasHiddenVisibility())
1846 Out << " __HIDDEN__";
1847 Out << ";\n";
1848 }
1849 }
1850
1851 // Output the global variable definitions and contents...
1852 if (!M.global_empty()) {
1853 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1854 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1855 I != E; ++I)
1856 if (!I->isDeclaration()) {
1857 // Ignore special globals, such as debug info.
1858 if (getGlobalVariableClass(I))
1859 continue;
1860
1861 if (I->hasLocalLinkage())
1862 Out << "static ";
1863 else if (I->hasDLLImportLinkage())
1864 Out << "__declspec(dllimport) ";
1865 else if (I->hasDLLExportLinkage())
1866 Out << "__declspec(dllexport) ";
1867
1868 // Thread Local Storage
1869 if (I->isThreadLocal())
1870 Out << "__thread ";
1871
1872 printType(Out, I->getType()->getElementType(), false,
1873 GetValueName(I));
1874 if (I->hasLinkOnceLinkage())
1875 Out << " __attribute__((common))";
1876 else if (I->hasWeakLinkage())
1877 Out << " __ATTRIBUTE_WEAK__";
1878 else if (I->hasCommonLinkage())
1879 Out << " __ATTRIBUTE_WEAK__";
1880
1881 if (I->hasHiddenVisibility())
1882 Out << " __HIDDEN__";
1883
1884 // If the initializer is not null, emit the initializer. If it is null,
1885 // we try to avoid emitting large amounts of zeros. The problem with
1886 // this, however, occurs when the variable has weak linkage. In this
1887 // case, the assembler will complain about the variable being both weak
1888 // and common, so we disable this optimization.
1889 // FIXME common linkage should avoid this problem.
1890 if (!I->getInitializer()->isNullValue()) {
1891 Out << " = " ;
1892 writeOperand(I->getInitializer(), true);
1893 } else if (I->hasWeakLinkage()) {
1894 // We have to specify an initializer, but it doesn't have to be
1895 // complete. If the value is an aggregate, print out { 0 }, and let
1896 // the compiler figure out the rest of the zeros.
1897 Out << " = " ;
1898 if (I->getInitializer()->getType()->isStructTy() ||
1899 I->getInitializer()->getType()->isVectorTy()) {
1900 Out << "{ 0 }";
1901 } else if (I->getInitializer()->getType()->isArrayTy()) {
1902 // As with structs and vectors, but with an extra set of braces
1903 // because arrays are wrapped in structs.
1904 Out << "{ { 0 } }";
1905 } else {
1906 // Just print it out normally.
1907 writeOperand(I->getInitializer(), true);
1908 }
1909 }
1910 Out << ";\n";
1911 }
1912 }
1913
1914 if (!M.empty())
1915 Out << "\n\n/* Function Bodies */\n";
1916
1917 // Emit some helper functions for dealing with FCMP instruction's
1918 // predicates
1919 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1920 Out << "return X == X && Y == Y; }\n";
1921 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1922 Out << "return X != X || Y != Y; }\n";
1923 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1924 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1925 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1926 Out << "return X != Y; }\n";
1927 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1928 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1929 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1930 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1931 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1932 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1933 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1934 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1935 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1936 Out << "return X == Y ; }\n";
1937 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1938 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1939 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1940 Out << "return X < Y ; }\n";
1941 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1942 Out << "return X > Y ; }\n";
1943 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1944 Out << "return X <= Y ; }\n";
1945 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1946 Out << "return X >= Y ; }\n";
1947
1948 // Emit definitions of the intrinsics.
1949 for (SmallVector<const Function*, 8>::const_iterator
1950 I = intrinsicsToDefine.begin(),
1951 E = intrinsicsToDefine.end(); I != E; ++I) {
1952 printIntrinsicDefinition(**I, Out);
1953 }
1954
1955 return false;
1956 }
1957
1958
1959 /// Output all floating point constants that cannot be printed accurately...
printFloatingPointConstants(Function & F)1960 void CWriter::printFloatingPointConstants(Function &F) {
1961 // Scan the module for floating point constants. If any FP constant is used
1962 // in the function, we want to redirect it here so that we do not depend on
1963 // the precision of the printed form, unless the printed form preserves
1964 // precision.
1965 //
1966 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1967 I != E; ++I)
1968 printFloatingPointConstants(*I);
1969
1970 Out << '\n';
1971 }
1972
printFloatingPointConstants(const Constant * C)1973 void CWriter::printFloatingPointConstants(const Constant *C) {
1974 // If this is a constant expression, recursively check for constant fp values.
1975 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
1976 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
1977 printFloatingPointConstants(CE->getOperand(i));
1978 return;
1979 }
1980
1981 // Otherwise, check for a FP constant that we need to print.
1982 const ConstantFP *FPC = dyn_cast<ConstantFP>(C);
1983 if (FPC == 0 ||
1984 // Do not put in FPConstantMap if safe.
1985 isFPCSafeToPrint(FPC) ||
1986 // Already printed this constant?
1987 FPConstantMap.count(FPC))
1988 return;
1989
1990 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1991
1992 if (FPC->getType() == Type::getDoubleTy(FPC->getContext())) {
1993 double Val = FPC->getValueAPF().convertToDouble();
1994 uint64_t i = FPC->getValueAPF().bitcastToAPInt().getZExtValue();
1995 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1996 << " = 0x" << utohexstr(i)
1997 << "ULL; /* " << Val << " */\n";
1998 } else if (FPC->getType() == Type::getFloatTy(FPC->getContext())) {
1999 float Val = FPC->getValueAPF().convertToFloat();
2000 uint32_t i = (uint32_t)FPC->getValueAPF().bitcastToAPInt().
2001 getZExtValue();
2002 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
2003 << " = 0x" << utohexstr(i)
2004 << "U; /* " << Val << " */\n";
2005 } else if (FPC->getType() == Type::getX86_FP80Ty(FPC->getContext())) {
2006 // api needed to prevent premature destruction
2007 APInt api = FPC->getValueAPF().bitcastToAPInt();
2008 const uint64_t *p = api.getRawData();
2009 Out << "static const ConstantFP80Ty FPConstant" << FPCounter++
2010 << " = { 0x" << utohexstr(p[0])
2011 << "ULL, 0x" << utohexstr((uint16_t)p[1]) << ",{0,0,0}"
2012 << "}; /* Long double constant */\n";
2013 } else if (FPC->getType() == Type::getPPC_FP128Ty(FPC->getContext()) ||
2014 FPC->getType() == Type::getFP128Ty(FPC->getContext())) {
2015 APInt api = FPC->getValueAPF().bitcastToAPInt();
2016 const uint64_t *p = api.getRawData();
2017 Out << "static const ConstantFP128Ty FPConstant" << FPCounter++
2018 << " = { 0x"
2019 << utohexstr(p[0]) << ", 0x" << utohexstr(p[1])
2020 << "}; /* Long double constant */\n";
2021
2022 } else {
2023 llvm_unreachable("Unknown float type!");
2024 }
2025 }
2026
2027
2028 /// printSymbolTable - Run through symbol table looking for type names. If a
2029 /// type name is found, emit its declaration...
2030 ///
printModuleTypes()2031 void CWriter::printModuleTypes() {
2032 Out << "/* Helper union for bitcasts */\n";
2033 Out << "typedef union {\n";
2034 Out << " unsigned int Int32;\n";
2035 Out << " unsigned long long Int64;\n";
2036 Out << " float Float;\n";
2037 Out << " double Double;\n";
2038 Out << "} llvmBitCastUnion;\n";
2039
2040 // Get all of the struct types used in the module.
2041 std::vector<StructType*> StructTypes;
2042 TheModule->findUsedStructTypes(StructTypes);
2043
2044 if (StructTypes.empty()) return;
2045
2046 Out << "/* Structure forward decls */\n";
2047
2048 unsigned NextTypeID = 0;
2049
2050 // If any of them are missing names, add a unique ID to UnnamedStructIDs.
2051 // Print out forward declarations for structure types.
2052 for (unsigned i = 0, e = StructTypes.size(); i != e; ++i) {
2053 StructType *ST = StructTypes[i];
2054
2055 if (ST->isLiteral() || ST->getName().empty())
2056 UnnamedStructIDs[ST] = NextTypeID++;
2057
2058 std::string Name = getStructName(ST);
2059
2060 Out << "typedef struct " << Name << ' ' << Name << ";\n";
2061 }
2062
2063 Out << '\n';
2064
2065 // Keep track of which structures have been printed so far.
2066 SmallPtrSet<Type *, 16> StructPrinted;
2067
2068 // Loop over all structures then push them into the stack so they are
2069 // printed in the correct order.
2070 //
2071 Out << "/* Structure contents */\n";
2072 for (unsigned i = 0, e = StructTypes.size(); i != e; ++i)
2073 if (StructTypes[i]->isStructTy())
2074 // Only print out used types!
2075 printContainedStructs(StructTypes[i], StructPrinted);
2076 }
2077
2078 // Push the struct onto the stack and recursively push all structs
2079 // this one depends on.
2080 //
2081 // TODO: Make this work properly with vector types
2082 //
printContainedStructs(Type * Ty,SmallPtrSet<Type *,16> & StructPrinted)2083 void CWriter::printContainedStructs(Type *Ty,
2084 SmallPtrSet<Type *, 16> &StructPrinted) {
2085 // Don't walk through pointers.
2086 if (Ty->isPointerTy() || Ty->isPrimitiveType() || Ty->isIntegerTy())
2087 return;
2088
2089 // Print all contained types first.
2090 for (Type::subtype_iterator I = Ty->subtype_begin(),
2091 E = Ty->subtype_end(); I != E; ++I)
2092 printContainedStructs(*I, StructPrinted);
2093
2094 if (StructType *ST = dyn_cast<StructType>(Ty)) {
2095 // Check to see if we have already printed this struct.
2096 if (!StructPrinted.insert(Ty)) return;
2097
2098 // Print structure type out.
2099 printType(Out, ST, false, getStructName(ST), true);
2100 Out << ";\n\n";
2101 }
2102 }
2103
printFunctionSignature(const Function * F,bool Prototype)2104 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
2105 /// isStructReturn - Should this function actually return a struct by-value?
2106 bool isStructReturn = F->hasStructRetAttr();
2107
2108 if (F->hasLocalLinkage()) Out << "static ";
2109 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
2110 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
2111 switch (F->getCallingConv()) {
2112 case CallingConv::X86_StdCall:
2113 Out << "__attribute__((stdcall)) ";
2114 break;
2115 case CallingConv::X86_FastCall:
2116 Out << "__attribute__((fastcall)) ";
2117 break;
2118 case CallingConv::X86_ThisCall:
2119 Out << "__attribute__((thiscall)) ";
2120 break;
2121 default:
2122 break;
2123 }
2124
2125 // Loop over the arguments, printing them...
2126 FunctionType *FT = cast<FunctionType>(F->getFunctionType());
2127 const AttrListPtr &PAL = F->getAttributes();
2128
2129 std::string tstr;
2130 raw_string_ostream FunctionInnards(tstr);
2131
2132 // Print out the name...
2133 FunctionInnards << GetValueName(F) << '(';
2134
2135 bool PrintedArg = false;
2136 if (!F->isDeclaration()) {
2137 if (!F->arg_empty()) {
2138 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
2139 unsigned Idx = 1;
2140
2141 // If this is a struct-return function, don't print the hidden
2142 // struct-return argument.
2143 if (isStructReturn) {
2144 assert(I != E && "Invalid struct return function!");
2145 ++I;
2146 ++Idx;
2147 }
2148
2149 std::string ArgName;
2150 for (; I != E; ++I) {
2151 if (PrintedArg) FunctionInnards << ", ";
2152 if (I->hasName() || !Prototype)
2153 ArgName = GetValueName(I);
2154 else
2155 ArgName = "";
2156 Type *ArgTy = I->getType();
2157 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2158 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2159 ByValParams.insert(I);
2160 }
2161 printType(FunctionInnards, ArgTy,
2162 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt),
2163 ArgName);
2164 PrintedArg = true;
2165 ++Idx;
2166 }
2167 }
2168 } else {
2169 // Loop over the arguments, printing them.
2170 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
2171 unsigned Idx = 1;
2172
2173 // If this is a struct-return function, don't print the hidden
2174 // struct-return argument.
2175 if (isStructReturn) {
2176 assert(I != E && "Invalid struct return function!");
2177 ++I;
2178 ++Idx;
2179 }
2180
2181 for (; I != E; ++I) {
2182 if (PrintedArg) FunctionInnards << ", ";
2183 Type *ArgTy = *I;
2184 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2185 assert(ArgTy->isPointerTy());
2186 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2187 }
2188 printType(FunctionInnards, ArgTy,
2189 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt));
2190 PrintedArg = true;
2191 ++Idx;
2192 }
2193 }
2194
2195 if (!PrintedArg && FT->isVarArg()) {
2196 FunctionInnards << "int vararg_dummy_arg";
2197 PrintedArg = true;
2198 }
2199
2200 // Finish printing arguments... if this is a vararg function, print the ...,
2201 // unless there are no known types, in which case, we just emit ().
2202 //
2203 if (FT->isVarArg() && PrintedArg) {
2204 FunctionInnards << ",..."; // Output varargs portion of signature!
2205 } else if (!FT->isVarArg() && !PrintedArg) {
2206 FunctionInnards << "void"; // ret() -> ret(void) in C.
2207 }
2208 FunctionInnards << ')';
2209
2210 // Get the return tpe for the function.
2211 Type *RetTy;
2212 if (!isStructReturn)
2213 RetTy = F->getReturnType();
2214 else {
2215 // If this is a struct-return function, print the struct-return type.
2216 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
2217 }
2218
2219 // Print out the return type and the signature built above.
2220 printType(Out, RetTy,
2221 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt),
2222 FunctionInnards.str());
2223 }
2224
isFPIntBitCast(const Instruction & I)2225 static inline bool isFPIntBitCast(const Instruction &I) {
2226 if (!isa<BitCastInst>(I))
2227 return false;
2228 Type *SrcTy = I.getOperand(0)->getType();
2229 Type *DstTy = I.getType();
2230 return (SrcTy->isFloatingPointTy() && DstTy->isIntegerTy()) ||
2231 (DstTy->isFloatingPointTy() && SrcTy->isIntegerTy());
2232 }
2233
printFunction(Function & F)2234 void CWriter::printFunction(Function &F) {
2235 /// isStructReturn - Should this function actually return a struct by-value?
2236 bool isStructReturn = F.hasStructRetAttr();
2237
2238 printFunctionSignature(&F, false);
2239 Out << " {\n";
2240
2241 // If this is a struct return function, handle the result with magic.
2242 if (isStructReturn) {
2243 Type *StructTy =
2244 cast<PointerType>(F.arg_begin()->getType())->getElementType();
2245 Out << " ";
2246 printType(Out, StructTy, false, "StructReturn");
2247 Out << "; /* Struct return temporary */\n";
2248
2249 Out << " ";
2250 printType(Out, F.arg_begin()->getType(), false,
2251 GetValueName(F.arg_begin()));
2252 Out << " = &StructReturn;\n";
2253 }
2254
2255 bool PrintedVar = false;
2256
2257 // print local variable information for the function
2258 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
2259 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
2260 Out << " ";
2261 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
2262 Out << "; /* Address-exposed local */\n";
2263 PrintedVar = true;
2264 } else if (I->getType() != Type::getVoidTy(F.getContext()) &&
2265 !isInlinableInst(*I)) {
2266 Out << " ";
2267 printType(Out, I->getType(), false, GetValueName(&*I));
2268 Out << ";\n";
2269
2270 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
2271 Out << " ";
2272 printType(Out, I->getType(), false,
2273 GetValueName(&*I)+"__PHI_TEMPORARY");
2274 Out << ";\n";
2275 }
2276 PrintedVar = true;
2277 }
2278 // We need a temporary for the BitCast to use so it can pluck a value out
2279 // of a union to do the BitCast. This is separate from the need for a
2280 // variable to hold the result of the BitCast.
2281 if (isFPIntBitCast(*I)) {
2282 Out << " llvmBitCastUnion " << GetValueName(&*I)
2283 << "__BITCAST_TEMPORARY;\n";
2284 PrintedVar = true;
2285 }
2286 }
2287
2288 if (PrintedVar)
2289 Out << '\n';
2290
2291 if (F.hasExternalLinkage() && F.getName() == "main")
2292 Out << " CODE_FOR_MAIN();\n";
2293
2294 // print the basic blocks
2295 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
2296 if (Loop *L = LI->getLoopFor(BB)) {
2297 if (L->getHeader() == BB && L->getParentLoop() == 0)
2298 printLoop(L);
2299 } else {
2300 printBasicBlock(BB);
2301 }
2302 }
2303
2304 Out << "}\n\n";
2305 }
2306
printLoop(Loop * L)2307 void CWriter::printLoop(Loop *L) {
2308 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
2309 << "' to make GCC happy */\n";
2310 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
2311 BasicBlock *BB = L->getBlocks()[i];
2312 Loop *BBLoop = LI->getLoopFor(BB);
2313 if (BBLoop == L)
2314 printBasicBlock(BB);
2315 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
2316 printLoop(BBLoop);
2317 }
2318 Out << " } while (1); /* end of syntactic loop '"
2319 << L->getHeader()->getName() << "' */\n";
2320 }
2321
printBasicBlock(BasicBlock * BB)2322 void CWriter::printBasicBlock(BasicBlock *BB) {
2323
2324 // Don't print the label for the basic block if there are no uses, or if
2325 // the only terminator use is the predecessor basic block's terminator.
2326 // We have to scan the use list because PHI nodes use basic blocks too but
2327 // do not require a label to be generated.
2328 //
2329 bool NeedsLabel = false;
2330 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
2331 if (isGotoCodeNecessary(*PI, BB)) {
2332 NeedsLabel = true;
2333 break;
2334 }
2335
2336 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2337
2338 // Output all of the instructions in the basic block...
2339 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2340 ++II) {
2341 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2342 if (II->getType() != Type::getVoidTy(BB->getContext()) &&
2343 !isInlineAsm(*II))
2344 outputLValue(II);
2345 else
2346 Out << " ";
2347 writeInstComputationInline(*II);
2348 Out << ";\n";
2349 }
2350 }
2351
2352 // Don't emit prefix or suffix for the terminator.
2353 visit(*BB->getTerminator());
2354 }
2355
2356
2357 // Specific Instruction type classes... note that all of the casts are
2358 // necessary because we use the instruction classes as opaque types...
2359 //
visitReturnInst(ReturnInst & I)2360 void CWriter::visitReturnInst(ReturnInst &I) {
2361 // If this is a struct return function, return the temporary struct.
2362 bool isStructReturn = I.getParent()->getParent()->hasStructRetAttr();
2363
2364 if (isStructReturn) {
2365 Out << " return StructReturn;\n";
2366 return;
2367 }
2368
2369 // Don't output a void return if this is the last basic block in the function
2370 if (I.getNumOperands() == 0 &&
2371 &*--I.getParent()->getParent()->end() == I.getParent() &&
2372 !I.getParent()->size() == 1) {
2373 return;
2374 }
2375
2376 Out << " return";
2377 if (I.getNumOperands()) {
2378 Out << ' ';
2379 writeOperand(I.getOperand(0));
2380 }
2381 Out << ";\n";
2382 }
2383
visitSwitchInst(SwitchInst & SI)2384 void CWriter::visitSwitchInst(SwitchInst &SI) {
2385
2386 Value* Cond = SI.getCondition();
2387
2388 Out << " switch (";
2389 writeOperand(Cond);
2390 Out << ") {\n default:\n";
2391 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2392 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2393 Out << ";\n";
2394
2395 unsigned NumCases = SI.getNumCases();
2396 // Skip the first item since that's the default case.
2397 for (unsigned i = 1; i < NumCases; ++i) {
2398 ConstantInt* CaseVal = SI.getCaseValue(i);
2399 BasicBlock* Succ = SI.getSuccessor(i);
2400 Out << " case ";
2401 writeOperand(CaseVal);
2402 Out << ":\n";
2403 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2404 printBranchToBlock(SI.getParent(), Succ, 2);
2405 if (Function::iterator(Succ) == llvm::next(Function::iterator(SI.getParent())))
2406 Out << " break;\n";
2407 }
2408
2409 Out << " }\n";
2410 }
2411
visitIndirectBrInst(IndirectBrInst & IBI)2412 void CWriter::visitIndirectBrInst(IndirectBrInst &IBI) {
2413 Out << " goto *(void*)(";
2414 writeOperand(IBI.getOperand(0));
2415 Out << ");\n";
2416 }
2417
visitUnreachableInst(UnreachableInst & I)2418 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2419 Out << " /*UNREACHABLE*/;\n";
2420 }
2421
isGotoCodeNecessary(BasicBlock * From,BasicBlock * To)2422 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2423 /// FIXME: This should be reenabled, but loop reordering safe!!
2424 return true;
2425
2426 if (llvm::next(Function::iterator(From)) != Function::iterator(To))
2427 return true; // Not the direct successor, we need a goto.
2428
2429 //isa<SwitchInst>(From->getTerminator())
2430
2431 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2432 return true;
2433 return false;
2434 }
2435
printPHICopiesForSuccessor(BasicBlock * CurBlock,BasicBlock * Successor,unsigned Indent)2436 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2437 BasicBlock *Successor,
2438 unsigned Indent) {
2439 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2440 PHINode *PN = cast<PHINode>(I);
2441 // Now we have to do the printing.
2442 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2443 if (!isa<UndefValue>(IV)) {
2444 Out << std::string(Indent, ' ');
2445 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2446 writeOperand(IV);
2447 Out << "; /* for PHI node */\n";
2448 }
2449 }
2450 }
2451
printBranchToBlock(BasicBlock * CurBB,BasicBlock * Succ,unsigned Indent)2452 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2453 unsigned Indent) {
2454 if (isGotoCodeNecessary(CurBB, Succ)) {
2455 Out << std::string(Indent, ' ') << " goto ";
2456 writeOperand(Succ);
2457 Out << ";\n";
2458 }
2459 }
2460
2461 // Branch instruction printing - Avoid printing out a branch to a basic block
2462 // that immediately succeeds the current one.
2463 //
visitBranchInst(BranchInst & I)2464 void CWriter::visitBranchInst(BranchInst &I) {
2465
2466 if (I.isConditional()) {
2467 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2468 Out << " if (";
2469 writeOperand(I.getCondition());
2470 Out << ") {\n";
2471
2472 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2473 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2474
2475 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2476 Out << " } else {\n";
2477 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2478 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2479 }
2480 } else {
2481 // First goto not necessary, assume second one is...
2482 Out << " if (!";
2483 writeOperand(I.getCondition());
2484 Out << ") {\n";
2485
2486 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2487 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2488 }
2489
2490 Out << " }\n";
2491 } else {
2492 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2493 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2494 }
2495 Out << "\n";
2496 }
2497
2498 // PHI nodes get copied into temporary values at the end of predecessor basic
2499 // blocks. We now need to copy these temporary values into the REAL value for
2500 // the PHI.
visitPHINode(PHINode & I)2501 void CWriter::visitPHINode(PHINode &I) {
2502 writeOperand(&I);
2503 Out << "__PHI_TEMPORARY";
2504 }
2505
2506
visitBinaryOperator(Instruction & I)2507 void CWriter::visitBinaryOperator(Instruction &I) {
2508 // binary instructions, shift instructions, setCond instructions.
2509 assert(!I.getType()->isPointerTy());
2510
2511 // We must cast the results of binary operations which might be promoted.
2512 bool needsCast = false;
2513 if ((I.getType() == Type::getInt8Ty(I.getContext())) ||
2514 (I.getType() == Type::getInt16Ty(I.getContext()))
2515 || (I.getType() == Type::getFloatTy(I.getContext()))) {
2516 needsCast = true;
2517 Out << "((";
2518 printType(Out, I.getType(), false);
2519 Out << ")(";
2520 }
2521
2522 // If this is a negation operation, print it out as such. For FP, we don't
2523 // want to print "-0.0 - X".
2524 if (BinaryOperator::isNeg(&I)) {
2525 Out << "-(";
2526 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2527 Out << ")";
2528 } else if (BinaryOperator::isFNeg(&I)) {
2529 Out << "-(";
2530 writeOperand(BinaryOperator::getFNegArgument(cast<BinaryOperator>(&I)));
2531 Out << ")";
2532 } else if (I.getOpcode() == Instruction::FRem) {
2533 // Output a call to fmod/fmodf instead of emitting a%b
2534 if (I.getType() == Type::getFloatTy(I.getContext()))
2535 Out << "fmodf(";
2536 else if (I.getType() == Type::getDoubleTy(I.getContext()))
2537 Out << "fmod(";
2538 else // all 3 flavors of long double
2539 Out << "fmodl(";
2540 writeOperand(I.getOperand(0));
2541 Out << ", ";
2542 writeOperand(I.getOperand(1));
2543 Out << ")";
2544 } else {
2545
2546 // Write out the cast of the instruction's value back to the proper type
2547 // if necessary.
2548 bool NeedsClosingParens = writeInstructionCast(I);
2549
2550 // Certain instructions require the operand to be forced to a specific type
2551 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2552 // below for operand 1
2553 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2554
2555 switch (I.getOpcode()) {
2556 case Instruction::Add:
2557 case Instruction::FAdd: Out << " + "; break;
2558 case Instruction::Sub:
2559 case Instruction::FSub: Out << " - "; break;
2560 case Instruction::Mul:
2561 case Instruction::FMul: Out << " * "; break;
2562 case Instruction::URem:
2563 case Instruction::SRem:
2564 case Instruction::FRem: Out << " % "; break;
2565 case Instruction::UDiv:
2566 case Instruction::SDiv:
2567 case Instruction::FDiv: Out << " / "; break;
2568 case Instruction::And: Out << " & "; break;
2569 case Instruction::Or: Out << " | "; break;
2570 case Instruction::Xor: Out << " ^ "; break;
2571 case Instruction::Shl : Out << " << "; break;
2572 case Instruction::LShr:
2573 case Instruction::AShr: Out << " >> "; break;
2574 default:
2575 #ifndef NDEBUG
2576 errs() << "Invalid operator type!" << I;
2577 #endif
2578 llvm_unreachable(0);
2579 }
2580
2581 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2582 if (NeedsClosingParens)
2583 Out << "))";
2584 }
2585
2586 if (needsCast) {
2587 Out << "))";
2588 }
2589 }
2590
visitICmpInst(ICmpInst & I)2591 void CWriter::visitICmpInst(ICmpInst &I) {
2592 // We must cast the results of icmp which might be promoted.
2593 bool needsCast = false;
2594
2595 // Write out the cast of the instruction's value back to the proper type
2596 // if necessary.
2597 bool NeedsClosingParens = writeInstructionCast(I);
2598
2599 // Certain icmp predicate require the operand to be forced to a specific type
2600 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2601 // below for operand 1
2602 writeOperandWithCast(I.getOperand(0), I);
2603
2604 switch (I.getPredicate()) {
2605 case ICmpInst::ICMP_EQ: Out << " == "; break;
2606 case ICmpInst::ICMP_NE: Out << " != "; break;
2607 case ICmpInst::ICMP_ULE:
2608 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2609 case ICmpInst::ICMP_UGE:
2610 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2611 case ICmpInst::ICMP_ULT:
2612 case ICmpInst::ICMP_SLT: Out << " < "; break;
2613 case ICmpInst::ICMP_UGT:
2614 case ICmpInst::ICMP_SGT: Out << " > "; break;
2615 default:
2616 #ifndef NDEBUG
2617 errs() << "Invalid icmp predicate!" << I;
2618 #endif
2619 llvm_unreachable(0);
2620 }
2621
2622 writeOperandWithCast(I.getOperand(1), I);
2623 if (NeedsClosingParens)
2624 Out << "))";
2625
2626 if (needsCast) {
2627 Out << "))";
2628 }
2629 }
2630
visitFCmpInst(FCmpInst & I)2631 void CWriter::visitFCmpInst(FCmpInst &I) {
2632 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2633 Out << "0";
2634 return;
2635 }
2636 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2637 Out << "1";
2638 return;
2639 }
2640
2641 const char* op = 0;
2642 switch (I.getPredicate()) {
2643 default: llvm_unreachable("Illegal FCmp predicate");
2644 case FCmpInst::FCMP_ORD: op = "ord"; break;
2645 case FCmpInst::FCMP_UNO: op = "uno"; break;
2646 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2647 case FCmpInst::FCMP_UNE: op = "une"; break;
2648 case FCmpInst::FCMP_ULT: op = "ult"; break;
2649 case FCmpInst::FCMP_ULE: op = "ule"; break;
2650 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2651 case FCmpInst::FCMP_UGE: op = "uge"; break;
2652 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2653 case FCmpInst::FCMP_ONE: op = "one"; break;
2654 case FCmpInst::FCMP_OLT: op = "olt"; break;
2655 case FCmpInst::FCMP_OLE: op = "ole"; break;
2656 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2657 case FCmpInst::FCMP_OGE: op = "oge"; break;
2658 }
2659
2660 Out << "llvm_fcmp_" << op << "(";
2661 // Write the first operand
2662 writeOperand(I.getOperand(0));
2663 Out << ", ";
2664 // Write the second operand
2665 writeOperand(I.getOperand(1));
2666 Out << ")";
2667 }
2668
getFloatBitCastField(Type * Ty)2669 static const char * getFloatBitCastField(Type *Ty) {
2670 switch (Ty->getTypeID()) {
2671 default: llvm_unreachable("Invalid Type");
2672 case Type::FloatTyID: return "Float";
2673 case Type::DoubleTyID: return "Double";
2674 case Type::IntegerTyID: {
2675 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2676 if (NumBits <= 32)
2677 return "Int32";
2678 else
2679 return "Int64";
2680 }
2681 }
2682 }
2683
visitCastInst(CastInst & I)2684 void CWriter::visitCastInst(CastInst &I) {
2685 Type *DstTy = I.getType();
2686 Type *SrcTy = I.getOperand(0)->getType();
2687 if (isFPIntBitCast(I)) {
2688 Out << '(';
2689 // These int<->float and long<->double casts need to be handled specially
2690 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2691 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2692 writeOperand(I.getOperand(0));
2693 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2694 << getFloatBitCastField(I.getType());
2695 Out << ')';
2696 return;
2697 }
2698
2699 Out << '(';
2700 printCast(I.getOpcode(), SrcTy, DstTy);
2701
2702 // Make a sext from i1 work by subtracting the i1 from 0 (an int).
2703 if (SrcTy == Type::getInt1Ty(I.getContext()) &&
2704 I.getOpcode() == Instruction::SExt)
2705 Out << "0-";
2706
2707 writeOperand(I.getOperand(0));
2708
2709 if (DstTy == Type::getInt1Ty(I.getContext()) &&
2710 (I.getOpcode() == Instruction::Trunc ||
2711 I.getOpcode() == Instruction::FPToUI ||
2712 I.getOpcode() == Instruction::FPToSI ||
2713 I.getOpcode() == Instruction::PtrToInt)) {
2714 // Make sure we really get a trunc to bool by anding the operand with 1
2715 Out << "&1u";
2716 }
2717 Out << ')';
2718 }
2719
visitSelectInst(SelectInst & I)2720 void CWriter::visitSelectInst(SelectInst &I) {
2721 Out << "((";
2722 writeOperand(I.getCondition());
2723 Out << ") ? (";
2724 writeOperand(I.getTrueValue());
2725 Out << ") : (";
2726 writeOperand(I.getFalseValue());
2727 Out << "))";
2728 }
2729
2730 // Returns the macro name or value of the max or min of an integer type
2731 // (as defined in limits.h).
printLimitValue(IntegerType & Ty,bool isSigned,bool isMax,raw_ostream & Out)2732 static void printLimitValue(IntegerType &Ty, bool isSigned, bool isMax,
2733 raw_ostream &Out) {
2734 const char* type;
2735 const char* sprefix = "";
2736
2737 unsigned NumBits = Ty.getBitWidth();
2738 if (NumBits <= 8) {
2739 type = "CHAR";
2740 sprefix = "S";
2741 } else if (NumBits <= 16) {
2742 type = "SHRT";
2743 } else if (NumBits <= 32) {
2744 type = "INT";
2745 } else if (NumBits <= 64) {
2746 type = "LLONG";
2747 } else {
2748 llvm_unreachable("Bit widths > 64 not implemented yet");
2749 }
2750
2751 if (isSigned)
2752 Out << sprefix << type << (isMax ? "_MAX" : "_MIN");
2753 else
2754 Out << "U" << type << (isMax ? "_MAX" : "0");
2755 }
2756
2757 #ifndef NDEBUG
isSupportedIntegerSize(IntegerType & T)2758 static bool isSupportedIntegerSize(IntegerType &T) {
2759 return T.getBitWidth() == 8 || T.getBitWidth() == 16 ||
2760 T.getBitWidth() == 32 || T.getBitWidth() == 64;
2761 }
2762 #endif
2763
printIntrinsicDefinition(const Function & F,raw_ostream & Out)2764 void CWriter::printIntrinsicDefinition(const Function &F, raw_ostream &Out) {
2765 FunctionType *funT = F.getFunctionType();
2766 Type *retT = F.getReturnType();
2767 IntegerType *elemT = cast<IntegerType>(funT->getParamType(1));
2768
2769 assert(isSupportedIntegerSize(*elemT) &&
2770 "CBackend does not support arbitrary size integers.");
2771 assert(cast<StructType>(retT)->getElementType(0) == elemT &&
2772 elemT == funT->getParamType(0) && funT->getNumParams() == 2);
2773
2774 switch (F.getIntrinsicID()) {
2775 default:
2776 llvm_unreachable("Unsupported Intrinsic.");
2777 case Intrinsic::uadd_with_overflow:
2778 // static inline Rty uadd_ixx(unsigned ixx a, unsigned ixx b) {
2779 // Rty r;
2780 // r.field0 = a + b;
2781 // r.field1 = (r.field0 < a);
2782 // return r;
2783 // }
2784 Out << "static inline ";
2785 printType(Out, retT);
2786 Out << GetValueName(&F);
2787 Out << "(";
2788 printSimpleType(Out, elemT, false);
2789 Out << "a,";
2790 printSimpleType(Out, elemT, false);
2791 Out << "b) {\n ";
2792 printType(Out, retT);
2793 Out << "r;\n";
2794 Out << " r.field0 = a + b;\n";
2795 Out << " r.field1 = (r.field0 < a);\n";
2796 Out << " return r;\n}\n";
2797 break;
2798
2799 case Intrinsic::sadd_with_overflow:
2800 // static inline Rty sadd_ixx(ixx a, ixx b) {
2801 // Rty r;
2802 // r.field1 = (b > 0 && a > XX_MAX - b) ||
2803 // (b < 0 && a < XX_MIN - b);
2804 // r.field0 = r.field1 ? 0 : a + b;
2805 // return r;
2806 // }
2807 Out << "static ";
2808 printType(Out, retT);
2809 Out << GetValueName(&F);
2810 Out << "(";
2811 printSimpleType(Out, elemT, true);
2812 Out << "a,";
2813 printSimpleType(Out, elemT, true);
2814 Out << "b) {\n ";
2815 printType(Out, retT);
2816 Out << "r;\n";
2817 Out << " r.field1 = (b > 0 && a > ";
2818 printLimitValue(*elemT, true, true, Out);
2819 Out << " - b) || (b < 0 && a < ";
2820 printLimitValue(*elemT, true, false, Out);
2821 Out << " - b);\n";
2822 Out << " r.field0 = r.field1 ? 0 : a + b;\n";
2823 Out << " return r;\n}\n";
2824 break;
2825 }
2826 }
2827
lowerIntrinsics(Function & F)2828 void CWriter::lowerIntrinsics(Function &F) {
2829 // This is used to keep track of intrinsics that get generated to a lowered
2830 // function. We must generate the prototypes before the function body which
2831 // will only be expanded on first use (by the loop below).
2832 std::vector<Function*> prototypesToGen;
2833
2834 // Examine all the instructions in this function to find the intrinsics that
2835 // need to be lowered.
2836 for (Function::iterator BB = F.begin(), EE = F.end(); BB != EE; ++BB)
2837 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2838 if (CallInst *CI = dyn_cast<CallInst>(I++))
2839 if (Function *F = CI->getCalledFunction())
2840 switch (F->getIntrinsicID()) {
2841 case Intrinsic::not_intrinsic:
2842 case Intrinsic::vastart:
2843 case Intrinsic::vacopy:
2844 case Intrinsic::vaend:
2845 case Intrinsic::returnaddress:
2846 case Intrinsic::frameaddress:
2847 case Intrinsic::setjmp:
2848 case Intrinsic::longjmp:
2849 case Intrinsic::prefetch:
2850 case Intrinsic::powi:
2851 case Intrinsic::x86_sse_cmp_ss:
2852 case Intrinsic::x86_sse_cmp_ps:
2853 case Intrinsic::x86_sse2_cmp_sd:
2854 case Intrinsic::x86_sse2_cmp_pd:
2855 case Intrinsic::ppc_altivec_lvsl:
2856 case Intrinsic::uadd_with_overflow:
2857 case Intrinsic::sadd_with_overflow:
2858 // We directly implement these intrinsics
2859 break;
2860 default:
2861 // If this is an intrinsic that directly corresponds to a GCC
2862 // builtin, we handle it.
2863 const char *BuiltinName = "";
2864 #define GET_GCC_BUILTIN_NAME
2865 #include "llvm/Intrinsics.gen"
2866 #undef GET_GCC_BUILTIN_NAME
2867 // If we handle it, don't lower it.
2868 if (BuiltinName[0]) break;
2869
2870 // All other intrinsic calls we must lower.
2871 Instruction *Before = 0;
2872 if (CI != &BB->front())
2873 Before = prior(BasicBlock::iterator(CI));
2874
2875 IL->LowerIntrinsicCall(CI);
2876 if (Before) { // Move iterator to instruction after call
2877 I = Before; ++I;
2878 } else {
2879 I = BB->begin();
2880 }
2881 // If the intrinsic got lowered to another call, and that call has
2882 // a definition then we need to make sure its prototype is emitted
2883 // before any calls to it.
2884 if (CallInst *Call = dyn_cast<CallInst>(I))
2885 if (Function *NewF = Call->getCalledFunction())
2886 if (!NewF->isDeclaration())
2887 prototypesToGen.push_back(NewF);
2888
2889 break;
2890 }
2891
2892 // We may have collected some prototypes to emit in the loop above.
2893 // Emit them now, before the function that uses them is emitted. But,
2894 // be careful not to emit them twice.
2895 std::vector<Function*>::iterator I = prototypesToGen.begin();
2896 std::vector<Function*>::iterator E = prototypesToGen.end();
2897 for ( ; I != E; ++I) {
2898 if (intrinsicPrototypesAlreadyGenerated.insert(*I).second) {
2899 Out << '\n';
2900 printFunctionSignature(*I, true);
2901 Out << ";\n";
2902 }
2903 }
2904 }
2905
visitCallInst(CallInst & I)2906 void CWriter::visitCallInst(CallInst &I) {
2907 if (isa<InlineAsm>(I.getCalledValue()))
2908 return visitInlineAsm(I);
2909
2910 bool WroteCallee = false;
2911
2912 // Handle intrinsic function calls first...
2913 if (Function *F = I.getCalledFunction())
2914 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
2915 if (visitBuiltinCall(I, ID, WroteCallee))
2916 return;
2917
2918 Value *Callee = I.getCalledValue();
2919
2920 PointerType *PTy = cast<PointerType>(Callee->getType());
2921 FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2922
2923 // If this is a call to a struct-return function, assign to the first
2924 // parameter instead of passing it to the call.
2925 const AttrListPtr &PAL = I.getAttributes();
2926 bool hasByVal = I.hasByValArgument();
2927 bool isStructRet = I.hasStructRetAttr();
2928 if (isStructRet) {
2929 writeOperandDeref(I.getArgOperand(0));
2930 Out << " = ";
2931 }
2932
2933 if (I.isTailCall()) Out << " /*tail*/ ";
2934
2935 if (!WroteCallee) {
2936 // If this is an indirect call to a struct return function, we need to cast
2937 // the pointer. Ditto for indirect calls with byval arguments.
2938 bool NeedsCast = (hasByVal || isStructRet) && !isa<Function>(Callee);
2939
2940 // GCC is a real PITA. It does not permit codegening casts of functions to
2941 // function pointers if they are in a call (it generates a trap instruction
2942 // instead!). We work around this by inserting a cast to void* in between
2943 // the function and the function pointer cast. Unfortunately, we can't just
2944 // form the constant expression here, because the folder will immediately
2945 // nuke it.
2946 //
2947 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2948 // that void* and function pointers have the same size. :( To deal with this
2949 // in the common case, we handle casts where the number of arguments passed
2950 // match exactly.
2951 //
2952 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2953 if (CE->isCast())
2954 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2955 NeedsCast = true;
2956 Callee = RF;
2957 }
2958
2959 if (NeedsCast) {
2960 // Ok, just cast the pointer type.
2961 Out << "((";
2962 if (isStructRet)
2963 printStructReturnPointerFunctionType(Out, PAL,
2964 cast<PointerType>(I.getCalledValue()->getType()));
2965 else if (hasByVal)
2966 printType(Out, I.getCalledValue()->getType(), false, "", true, PAL);
2967 else
2968 printType(Out, I.getCalledValue()->getType());
2969 Out << ")(void*)";
2970 }
2971 writeOperand(Callee);
2972 if (NeedsCast) Out << ')';
2973 }
2974
2975 Out << '(';
2976
2977 bool PrintedArg = false;
2978 if(FTy->isVarArg() && !FTy->getNumParams()) {
2979 Out << "0 /*dummy arg*/";
2980 PrintedArg = true;
2981 }
2982
2983 unsigned NumDeclaredParams = FTy->getNumParams();
2984 CallSite CS(&I);
2985 CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
2986 unsigned ArgNo = 0;
2987 if (isStructRet) { // Skip struct return argument.
2988 ++AI;
2989 ++ArgNo;
2990 }
2991
2992
2993 for (; AI != AE; ++AI, ++ArgNo) {
2994 if (PrintedArg) Out << ", ";
2995 if (ArgNo < NumDeclaredParams &&
2996 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2997 Out << '(';
2998 printType(Out, FTy->getParamType(ArgNo),
2999 /*isSigned=*/PAL.paramHasAttr(ArgNo+1, Attribute::SExt));
3000 Out << ')';
3001 }
3002 // Check if the argument is expected to be passed by value.
3003 if (I.paramHasAttr(ArgNo+1, Attribute::ByVal))
3004 writeOperandDeref(*AI);
3005 else
3006 writeOperand(*AI);
3007 PrintedArg = true;
3008 }
3009 Out << ')';
3010 }
3011
3012 /// visitBuiltinCall - Handle the call to the specified builtin. Returns true
3013 /// if the entire call is handled, return false if it wasn't handled, and
3014 /// optionally set 'WroteCallee' if the callee has already been printed out.
visitBuiltinCall(CallInst & I,Intrinsic::ID ID,bool & WroteCallee)3015 bool CWriter::visitBuiltinCall(CallInst &I, Intrinsic::ID ID,
3016 bool &WroteCallee) {
3017 switch (ID) {
3018 default: {
3019 // If this is an intrinsic that directly corresponds to a GCC
3020 // builtin, we emit it here.
3021 const char *BuiltinName = "";
3022 Function *F = I.getCalledFunction();
3023 #define GET_GCC_BUILTIN_NAME
3024 #include "llvm/Intrinsics.gen"
3025 #undef GET_GCC_BUILTIN_NAME
3026 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
3027
3028 Out << BuiltinName;
3029 WroteCallee = true;
3030 return false;
3031 }
3032 case Intrinsic::vastart:
3033 Out << "0; ";
3034
3035 Out << "va_start(*(va_list*)";
3036 writeOperand(I.getArgOperand(0));
3037 Out << ", ";
3038 // Output the last argument to the enclosing function.
3039 if (I.getParent()->getParent()->arg_empty())
3040 Out << "vararg_dummy_arg";
3041 else
3042 writeOperand(--I.getParent()->getParent()->arg_end());
3043 Out << ')';
3044 return true;
3045 case Intrinsic::vaend:
3046 if (!isa<ConstantPointerNull>(I.getArgOperand(0))) {
3047 Out << "0; va_end(*(va_list*)";
3048 writeOperand(I.getArgOperand(0));
3049 Out << ')';
3050 } else {
3051 Out << "va_end(*(va_list*)0)";
3052 }
3053 return true;
3054 case Intrinsic::vacopy:
3055 Out << "0; ";
3056 Out << "va_copy(*(va_list*)";
3057 writeOperand(I.getArgOperand(0));
3058 Out << ", *(va_list*)";
3059 writeOperand(I.getArgOperand(1));
3060 Out << ')';
3061 return true;
3062 case Intrinsic::returnaddress:
3063 Out << "__builtin_return_address(";
3064 writeOperand(I.getArgOperand(0));
3065 Out << ')';
3066 return true;
3067 case Intrinsic::frameaddress:
3068 Out << "__builtin_frame_address(";
3069 writeOperand(I.getArgOperand(0));
3070 Out << ')';
3071 return true;
3072 case Intrinsic::powi:
3073 Out << "__builtin_powi(";
3074 writeOperand(I.getArgOperand(0));
3075 Out << ", ";
3076 writeOperand(I.getArgOperand(1));
3077 Out << ')';
3078 return true;
3079 case Intrinsic::setjmp:
3080 Out << "setjmp(*(jmp_buf*)";
3081 writeOperand(I.getArgOperand(0));
3082 Out << ')';
3083 return true;
3084 case Intrinsic::longjmp:
3085 Out << "longjmp(*(jmp_buf*)";
3086 writeOperand(I.getArgOperand(0));
3087 Out << ", ";
3088 writeOperand(I.getArgOperand(1));
3089 Out << ')';
3090 return true;
3091 case Intrinsic::prefetch:
3092 Out << "LLVM_PREFETCH((const void *)";
3093 writeOperand(I.getArgOperand(0));
3094 Out << ", ";
3095 writeOperand(I.getArgOperand(1));
3096 Out << ", ";
3097 writeOperand(I.getArgOperand(2));
3098 Out << ")";
3099 return true;
3100 case Intrinsic::stacksave:
3101 // Emit this as: Val = 0; *((void**)&Val) = __builtin_stack_save()
3102 // to work around GCC bugs (see PR1809).
3103 Out << "0; *((void**)&" << GetValueName(&I)
3104 << ") = __builtin_stack_save()";
3105 return true;
3106 case Intrinsic::x86_sse_cmp_ss:
3107 case Intrinsic::x86_sse_cmp_ps:
3108 case Intrinsic::x86_sse2_cmp_sd:
3109 case Intrinsic::x86_sse2_cmp_pd:
3110 Out << '(';
3111 printType(Out, I.getType());
3112 Out << ')';
3113 // Multiple GCC builtins multiplex onto this intrinsic.
3114 switch (cast<ConstantInt>(I.getArgOperand(2))->getZExtValue()) {
3115 default: llvm_unreachable("Invalid llvm.x86.sse.cmp!");
3116 case 0: Out << "__builtin_ia32_cmpeq"; break;
3117 case 1: Out << "__builtin_ia32_cmplt"; break;
3118 case 2: Out << "__builtin_ia32_cmple"; break;
3119 case 3: Out << "__builtin_ia32_cmpunord"; break;
3120 case 4: Out << "__builtin_ia32_cmpneq"; break;
3121 case 5: Out << "__builtin_ia32_cmpnlt"; break;
3122 case 6: Out << "__builtin_ia32_cmpnle"; break;
3123 case 7: Out << "__builtin_ia32_cmpord"; break;
3124 }
3125 if (ID == Intrinsic::x86_sse_cmp_ps || ID == Intrinsic::x86_sse2_cmp_pd)
3126 Out << 'p';
3127 else
3128 Out << 's';
3129 if (ID == Intrinsic::x86_sse_cmp_ss || ID == Intrinsic::x86_sse_cmp_ps)
3130 Out << 's';
3131 else
3132 Out << 'd';
3133
3134 Out << "(";
3135 writeOperand(I.getArgOperand(0));
3136 Out << ", ";
3137 writeOperand(I.getArgOperand(1));
3138 Out << ")";
3139 return true;
3140 case Intrinsic::ppc_altivec_lvsl:
3141 Out << '(';
3142 printType(Out, I.getType());
3143 Out << ')';
3144 Out << "__builtin_altivec_lvsl(0, (void*)";
3145 writeOperand(I.getArgOperand(0));
3146 Out << ")";
3147 return true;
3148 case Intrinsic::uadd_with_overflow:
3149 case Intrinsic::sadd_with_overflow:
3150 Out << GetValueName(I.getCalledFunction()) << "(";
3151 writeOperand(I.getArgOperand(0));
3152 Out << ", ";
3153 writeOperand(I.getArgOperand(1));
3154 Out << ")";
3155 return true;
3156 }
3157 }
3158
3159 //This converts the llvm constraint string to something gcc is expecting.
3160 //TODO: work out platform independent constraints and factor those out
3161 // of the per target tables
3162 // handle multiple constraint codes
InterpretASMConstraint(InlineAsm::ConstraintInfo & c)3163 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
3164 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
3165
3166 // Grab the translation table from MCAsmInfo if it exists.
3167 const MCAsmInfo *TargetAsm;
3168 std::string Triple = TheModule->getTargetTriple();
3169 if (Triple.empty())
3170 Triple = llvm::sys::getHostTriple();
3171
3172 std::string E;
3173 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
3174 TargetAsm = Match->createMCAsmInfo(Triple);
3175 else
3176 return c.Codes[0];
3177
3178 const char *const *table = TargetAsm->getAsmCBE();
3179
3180 // Search the translation table if it exists.
3181 for (int i = 0; table && table[i]; i += 2)
3182 if (c.Codes[0] == table[i]) {
3183 delete TargetAsm;
3184 return table[i+1];
3185 }
3186
3187 // Default is identity.
3188 delete TargetAsm;
3189 return c.Codes[0];
3190 }
3191
3192 //TODO: import logic from AsmPrinter.cpp
gccifyAsm(std::string asmstr)3193 static std::string gccifyAsm(std::string asmstr) {
3194 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
3195 if (asmstr[i] == '\n')
3196 asmstr.replace(i, 1, "\\n");
3197 else if (asmstr[i] == '\t')
3198 asmstr.replace(i, 1, "\\t");
3199 else if (asmstr[i] == '$') {
3200 if (asmstr[i + 1] == '{') {
3201 std::string::size_type a = asmstr.find_first_of(':', i + 1);
3202 std::string::size_type b = asmstr.find_first_of('}', i + 1);
3203 std::string n = "%" +
3204 asmstr.substr(a + 1, b - a - 1) +
3205 asmstr.substr(i + 2, a - i - 2);
3206 asmstr.replace(i, b - i + 1, n);
3207 i += n.size() - 1;
3208 } else
3209 asmstr.replace(i, 1, "%");
3210 }
3211 else if (asmstr[i] == '%')//grr
3212 { asmstr.replace(i, 1, "%%"); ++i;}
3213
3214 return asmstr;
3215 }
3216
3217 //TODO: assumptions about what consume arguments from the call are likely wrong
3218 // handle communitivity
visitInlineAsm(CallInst & CI)3219 void CWriter::visitInlineAsm(CallInst &CI) {
3220 InlineAsm* as = cast<InlineAsm>(CI.getCalledValue());
3221 InlineAsm::ConstraintInfoVector Constraints = as->ParseConstraints();
3222
3223 std::vector<std::pair<Value*, int> > ResultVals;
3224 if (CI.getType() == Type::getVoidTy(CI.getContext()))
3225 ;
3226 else if (StructType *ST = dyn_cast<StructType>(CI.getType())) {
3227 for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i)
3228 ResultVals.push_back(std::make_pair(&CI, (int)i));
3229 } else {
3230 ResultVals.push_back(std::make_pair(&CI, -1));
3231 }
3232
3233 // Fix up the asm string for gcc and emit it.
3234 Out << "__asm__ volatile (\"" << gccifyAsm(as->getAsmString()) << "\"\n";
3235 Out << " :";
3236
3237 unsigned ValueCount = 0;
3238 bool IsFirst = true;
3239
3240 // Convert over all the output constraints.
3241 for (InlineAsm::ConstraintInfoVector::iterator I = Constraints.begin(),
3242 E = Constraints.end(); I != E; ++I) {
3243
3244 if (I->Type != InlineAsm::isOutput) {
3245 ++ValueCount;
3246 continue; // Ignore non-output constraints.
3247 }
3248
3249 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3250 std::string C = InterpretASMConstraint(*I);
3251 if (C.empty()) continue;
3252
3253 if (!IsFirst) {
3254 Out << ", ";
3255 IsFirst = false;
3256 }
3257
3258 // Unpack the dest.
3259 Value *DestVal;
3260 int DestValNo = -1;
3261
3262 if (ValueCount < ResultVals.size()) {
3263 DestVal = ResultVals[ValueCount].first;
3264 DestValNo = ResultVals[ValueCount].second;
3265 } else
3266 DestVal = CI.getArgOperand(ValueCount-ResultVals.size());
3267
3268 if (I->isEarlyClobber)
3269 C = "&"+C;
3270
3271 Out << "\"=" << C << "\"(" << GetValueName(DestVal);
3272 if (DestValNo != -1)
3273 Out << ".field" << DestValNo; // Multiple retvals.
3274 Out << ")";
3275 ++ValueCount;
3276 }
3277
3278
3279 // Convert over all the input constraints.
3280 Out << "\n :";
3281 IsFirst = true;
3282 ValueCount = 0;
3283 for (InlineAsm::ConstraintInfoVector::iterator I = Constraints.begin(),
3284 E = Constraints.end(); I != E; ++I) {
3285 if (I->Type != InlineAsm::isInput) {
3286 ++ValueCount;
3287 continue; // Ignore non-input constraints.
3288 }
3289
3290 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3291 std::string C = InterpretASMConstraint(*I);
3292 if (C.empty()) continue;
3293
3294 if (!IsFirst) {
3295 Out << ", ";
3296 IsFirst = false;
3297 }
3298
3299 assert(ValueCount >= ResultVals.size() && "Input can't refer to result");
3300 Value *SrcVal = CI.getArgOperand(ValueCount-ResultVals.size());
3301
3302 Out << "\"" << C << "\"(";
3303 if (!I->isIndirect)
3304 writeOperand(SrcVal);
3305 else
3306 writeOperandDeref(SrcVal);
3307 Out << ")";
3308 }
3309
3310 // Convert over the clobber constraints.
3311 IsFirst = true;
3312 for (InlineAsm::ConstraintInfoVector::iterator I = Constraints.begin(),
3313 E = Constraints.end(); I != E; ++I) {
3314 if (I->Type != InlineAsm::isClobber)
3315 continue; // Ignore non-input constraints.
3316
3317 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3318 std::string C = InterpretASMConstraint(*I);
3319 if (C.empty()) continue;
3320
3321 if (!IsFirst) {
3322 Out << ", ";
3323 IsFirst = false;
3324 }
3325
3326 Out << '\"' << C << '"';
3327 }
3328
3329 Out << ")";
3330 }
3331
visitAllocaInst(AllocaInst & I)3332 void CWriter::visitAllocaInst(AllocaInst &I) {
3333 Out << '(';
3334 printType(Out, I.getType());
3335 Out << ") alloca(sizeof(";
3336 printType(Out, I.getType()->getElementType());
3337 Out << ')';
3338 if (I.isArrayAllocation()) {
3339 Out << " * " ;
3340 writeOperand(I.getOperand(0));
3341 }
3342 Out << ')';
3343 }
3344
printGEPExpression(Value * Ptr,gep_type_iterator I,gep_type_iterator E,bool Static)3345 void CWriter::printGEPExpression(Value *Ptr, gep_type_iterator I,
3346 gep_type_iterator E, bool Static) {
3347
3348 // If there are no indices, just print out the pointer.
3349 if (I == E) {
3350 writeOperand(Ptr);
3351 return;
3352 }
3353
3354 // Find out if the last index is into a vector. If so, we have to print this
3355 // specially. Since vectors can't have elements of indexable type, only the
3356 // last index could possibly be of a vector element.
3357 VectorType *LastIndexIsVector = 0;
3358 {
3359 for (gep_type_iterator TmpI = I; TmpI != E; ++TmpI)
3360 LastIndexIsVector = dyn_cast<VectorType>(*TmpI);
3361 }
3362
3363 Out << "(";
3364
3365 // If the last index is into a vector, we can't print it as &a[i][j] because
3366 // we can't index into a vector with j in GCC. Instead, emit this as
3367 // (((float*)&a[i])+j)
3368 if (LastIndexIsVector) {
3369 Out << "((";
3370 printType(Out, PointerType::getUnqual(LastIndexIsVector->getElementType()));
3371 Out << ")(";
3372 }
3373
3374 Out << '&';
3375
3376 // If the first index is 0 (very typical) we can do a number of
3377 // simplifications to clean up the code.
3378 Value *FirstOp = I.getOperand();
3379 if (!isa<Constant>(FirstOp) || !cast<Constant>(FirstOp)->isNullValue()) {
3380 // First index isn't simple, print it the hard way.
3381 writeOperand(Ptr);
3382 } else {
3383 ++I; // Skip the zero index.
3384
3385 // Okay, emit the first operand. If Ptr is something that is already address
3386 // exposed, like a global, avoid emitting (&foo)[0], just emit foo instead.
3387 if (isAddressExposed(Ptr)) {
3388 writeOperandInternal(Ptr, Static);
3389 } else if (I != E && (*I)->isStructTy()) {
3390 // If we didn't already emit the first operand, see if we can print it as
3391 // P->f instead of "P[0].f"
3392 writeOperand(Ptr);
3393 Out << "->field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3394 ++I; // eat the struct index as well.
3395 } else {
3396 // Instead of emitting P[0][1], emit (*P)[1], which is more idiomatic.
3397 Out << "(*";
3398 writeOperand(Ptr);
3399 Out << ")";
3400 }
3401 }
3402
3403 for (; I != E; ++I) {
3404 if ((*I)->isStructTy()) {
3405 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3406 } else if ((*I)->isArrayTy()) {
3407 Out << ".array[";
3408 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3409 Out << ']';
3410 } else if (!(*I)->isVectorTy()) {
3411 Out << '[';
3412 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3413 Out << ']';
3414 } else {
3415 // If the last index is into a vector, then print it out as "+j)". This
3416 // works with the 'LastIndexIsVector' code above.
3417 if (isa<Constant>(I.getOperand()) &&
3418 cast<Constant>(I.getOperand())->isNullValue()) {
3419 Out << "))"; // avoid "+0".
3420 } else {
3421 Out << ")+(";
3422 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3423 Out << "))";
3424 }
3425 }
3426 }
3427 Out << ")";
3428 }
3429
writeMemoryAccess(Value * Operand,Type * OperandType,bool IsVolatile,unsigned Alignment)3430 void CWriter::writeMemoryAccess(Value *Operand, Type *OperandType,
3431 bool IsVolatile, unsigned Alignment) {
3432
3433 bool IsUnaligned = Alignment &&
3434 Alignment < TD->getABITypeAlignment(OperandType);
3435
3436 if (!IsUnaligned)
3437 Out << '*';
3438 if (IsVolatile || IsUnaligned) {
3439 Out << "((";
3440 if (IsUnaligned)
3441 Out << "struct __attribute__ ((packed, aligned(" << Alignment << "))) {";
3442 printType(Out, OperandType, false, IsUnaligned ? "data" : "volatile*");
3443 if (IsUnaligned) {
3444 Out << "; } ";
3445 if (IsVolatile) Out << "volatile ";
3446 Out << "*";
3447 }
3448 Out << ")";
3449 }
3450
3451 writeOperand(Operand);
3452
3453 if (IsVolatile || IsUnaligned) {
3454 Out << ')';
3455 if (IsUnaligned)
3456 Out << "->data";
3457 }
3458 }
3459
visitLoadInst(LoadInst & I)3460 void CWriter::visitLoadInst(LoadInst &I) {
3461 writeMemoryAccess(I.getOperand(0), I.getType(), I.isVolatile(),
3462 I.getAlignment());
3463
3464 }
3465
visitStoreInst(StoreInst & I)3466 void CWriter::visitStoreInst(StoreInst &I) {
3467 writeMemoryAccess(I.getPointerOperand(), I.getOperand(0)->getType(),
3468 I.isVolatile(), I.getAlignment());
3469 Out << " = ";
3470 Value *Operand = I.getOperand(0);
3471 Constant *BitMask = 0;
3472 if (IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
3473 if (!ITy->isPowerOf2ByteWidth())
3474 // We have a bit width that doesn't match an even power-of-2 byte
3475 // size. Consequently we must & the value with the type's bit mask
3476 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
3477 if (BitMask)
3478 Out << "((";
3479 writeOperand(Operand);
3480 if (BitMask) {
3481 Out << ") & ";
3482 printConstant(BitMask, false);
3483 Out << ")";
3484 }
3485 }
3486
visitGetElementPtrInst(GetElementPtrInst & I)3487 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
3488 printGEPExpression(I.getPointerOperand(), gep_type_begin(I),
3489 gep_type_end(I), false);
3490 }
3491
visitVAArgInst(VAArgInst & I)3492 void CWriter::visitVAArgInst(VAArgInst &I) {
3493 Out << "va_arg(*(va_list*)";
3494 writeOperand(I.getOperand(0));
3495 Out << ", ";
3496 printType(Out, I.getType());
3497 Out << ");\n ";
3498 }
3499
visitInsertElementInst(InsertElementInst & I)3500 void CWriter::visitInsertElementInst(InsertElementInst &I) {
3501 Type *EltTy = I.getType()->getElementType();
3502 writeOperand(I.getOperand(0));
3503 Out << ";\n ";
3504 Out << "((";
3505 printType(Out, PointerType::getUnqual(EltTy));
3506 Out << ")(&" << GetValueName(&I) << "))[";
3507 writeOperand(I.getOperand(2));
3508 Out << "] = (";
3509 writeOperand(I.getOperand(1));
3510 Out << ")";
3511 }
3512
visitExtractElementInst(ExtractElementInst & I)3513 void CWriter::visitExtractElementInst(ExtractElementInst &I) {
3514 // We know that our operand is not inlined.
3515 Out << "((";
3516 Type *EltTy =
3517 cast<VectorType>(I.getOperand(0)->getType())->getElementType();
3518 printType(Out, PointerType::getUnqual(EltTy));
3519 Out << ")(&" << GetValueName(I.getOperand(0)) << "))[";
3520 writeOperand(I.getOperand(1));
3521 Out << "]";
3522 }
3523
visitShuffleVectorInst(ShuffleVectorInst & SVI)3524 void CWriter::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
3525 Out << "(";
3526 printType(Out, SVI.getType());
3527 Out << "){ ";
3528 VectorType *VT = SVI.getType();
3529 unsigned NumElts = VT->getNumElements();
3530 Type *EltTy = VT->getElementType();
3531
3532 for (unsigned i = 0; i != NumElts; ++i) {
3533 if (i) Out << ", ";
3534 int SrcVal = SVI.getMaskValue(i);
3535 if ((unsigned)SrcVal >= NumElts*2) {
3536 Out << " 0/*undef*/ ";
3537 } else {
3538 Value *Op = SVI.getOperand((unsigned)SrcVal >= NumElts);
3539 if (isa<Instruction>(Op)) {
3540 // Do an extractelement of this value from the appropriate input.
3541 Out << "((";
3542 printType(Out, PointerType::getUnqual(EltTy));
3543 Out << ")(&" << GetValueName(Op)
3544 << "))[" << (SrcVal & (NumElts-1)) << "]";
3545 } else if (isa<ConstantAggregateZero>(Op) || isa<UndefValue>(Op)) {
3546 Out << "0";
3547 } else {
3548 printConstant(cast<ConstantVector>(Op)->getOperand(SrcVal &
3549 (NumElts-1)),
3550 false);
3551 }
3552 }
3553 }
3554 Out << "}";
3555 }
3556
visitInsertValueInst(InsertValueInst & IVI)3557 void CWriter::visitInsertValueInst(InsertValueInst &IVI) {
3558 // Start by copying the entire aggregate value into the result variable.
3559 writeOperand(IVI.getOperand(0));
3560 Out << ";\n ";
3561
3562 // Then do the insert to update the field.
3563 Out << GetValueName(&IVI);
3564 for (const unsigned *b = IVI.idx_begin(), *i = b, *e = IVI.idx_end();
3565 i != e; ++i) {
3566 Type *IndexedTy =
3567 ExtractValueInst::getIndexedType(IVI.getOperand(0)->getType(),
3568 makeArrayRef(b, i+1));
3569 if (IndexedTy->isArrayTy())
3570 Out << ".array[" << *i << "]";
3571 else
3572 Out << ".field" << *i;
3573 }
3574 Out << " = ";
3575 writeOperand(IVI.getOperand(1));
3576 }
3577
visitExtractValueInst(ExtractValueInst & EVI)3578 void CWriter::visitExtractValueInst(ExtractValueInst &EVI) {
3579 Out << "(";
3580 if (isa<UndefValue>(EVI.getOperand(0))) {
3581 Out << "(";
3582 printType(Out, EVI.getType());
3583 Out << ") 0/*UNDEF*/";
3584 } else {
3585 Out << GetValueName(EVI.getOperand(0));
3586 for (const unsigned *b = EVI.idx_begin(), *i = b, *e = EVI.idx_end();
3587 i != e; ++i) {
3588 Type *IndexedTy =
3589 ExtractValueInst::getIndexedType(EVI.getOperand(0)->getType(),
3590 makeArrayRef(b, i+1));
3591 if (IndexedTy->isArrayTy())
3592 Out << ".array[" << *i << "]";
3593 else
3594 Out << ".field" << *i;
3595 }
3596 }
3597 Out << ")";
3598 }
3599
3600 //===----------------------------------------------------------------------===//
3601 // External Interface declaration
3602 //===----------------------------------------------------------------------===//
3603
addPassesToEmitFile(PassManagerBase & PM,formatted_raw_ostream & o,CodeGenFileType FileType,CodeGenOpt::Level OptLevel,bool DisableVerify)3604 bool CTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
3605 formatted_raw_ostream &o,
3606 CodeGenFileType FileType,
3607 CodeGenOpt::Level OptLevel,
3608 bool DisableVerify) {
3609 if (FileType != TargetMachine::CGFT_AssemblyFile) return true;
3610
3611 PM.add(createGCLoweringPass());
3612 PM.add(createLowerInvokePass());
3613 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
3614 PM.add(new CWriter(o));
3615 PM.add(createGCInfoDeleter());
3616 return false;
3617 }
3618