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1 : //===-- CodeGenFunction.h - Per-Function state for LLVM CodeGen -*- 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 is the internal per-function state used for llvm translation.
11 : //
12 : //===----------------------------------------------------------------------===//
13 :
14 : #ifndef CLANG_CODEGEN_CODEGENFUNCTION_H
15 : #define CLANG_CODEGEN_CODEGENFUNCTION_H
16 :
17 : #include "clang/AST/Type.h"
18 : #include "clang/AST/ExprCXX.h"
19 : #include "clang/AST/ExprObjC.h"
20 : #include "clang/AST/CharUnits.h"
21 : #include "clang/Basic/TargetInfo.h"
22 : #include "llvm/ADT/DenseMap.h"
23 : #include "llvm/ADT/SmallVector.h"
24 : #include "llvm/Support/ValueHandle.h"
25 : #include <map>
26 : #include "CodeGenModule.h"
27 : #include "CGBlocks.h"
28 : #include "CGBuilder.h"
29 : #include "CGCall.h"
30 : #include "CGCXX.h"
31 : #include "CGValue.h"
32 :
33 : namespace llvm {
34 : class BasicBlock;
35 : class LLVMContext;
36 : class Module;
37 : class SwitchInst;
38 : class Twine;
39 : class Value;
40 : }
41 :
42 : namespace clang {
43 : class ASTContext;
44 : class CXXDestructorDecl;
45 : class CXXTryStmt;
46 : class Decl;
47 : class EnumConstantDecl;
48 : class FunctionDecl;
49 : class FunctionProtoType;
50 : class LabelStmt;
51 : class ObjCContainerDecl;
52 : class ObjCInterfaceDecl;
53 : class ObjCIvarDecl;
54 : class ObjCMethodDecl;
55 : class ObjCImplementationDecl;
56 : class ObjCPropertyImplDecl;
57 : class TargetInfo;
58 : class VarDecl;
59 : class ObjCForCollectionStmt;
60 : class ObjCAtTryStmt;
61 : class ObjCAtThrowStmt;
62 : class ObjCAtSynchronizedStmt;
63 :
64 : namespace CodeGen {
65 : class CodeGenModule;
66 : class CodeGenTypes;
67 : class CGDebugInfo;
68 : class CGFunctionInfo;
69 : class CGRecordLayout;
70 :
71 : /// CodeGenFunction - This class organizes the per-function state that is used
72 : /// while generating LLVM code.
73 3076: class CodeGenFunction : public BlockFunction {
74 : CodeGenFunction(const CodeGenFunction&); // DO NOT IMPLEMENT
75 : void operator=(const CodeGenFunction&); // DO NOT IMPLEMENT
76 : public:
77 : CodeGenModule &CGM; // Per-module state.
78 : const TargetInfo &Target;
79 :
80 : typedef std::pair<llvm::Value *, llvm::Value *> ComplexPairTy;
81 : CGBuilderTy Builder;
82 :
83 : /// CurFuncDecl - Holds the Decl for the current function or ObjC method.
84 : /// This excludes BlockDecls.
85 : const Decl *CurFuncDecl;
86 : /// CurCodeDecl - This is the inner-most code context, which includes blocks.
87 : const Decl *CurCodeDecl;
88 : const CGFunctionInfo *CurFnInfo;
89 : QualType FnRetTy;
90 : llvm::Function *CurFn;
91 :
92 : /// CurGD - The GlobalDecl for the current function being compiled.
93 : GlobalDecl CurGD;
94 : /// OuterTryBlock - This is the address of the outter most try block, 0
95 : /// otherwise.
96 : const Stmt *OuterTryBlock;
97 :
98 : /// ReturnBlock - Unified return block.
99 : llvm::BasicBlock *ReturnBlock;
100 : /// ReturnValue - The temporary alloca to hold the return value. This is null
101 : /// iff the function has no return value.
102 : llvm::Value *ReturnValue;
103 :
104 : /// AllocaInsertPoint - This is an instruction in the entry block before which
105 : /// we prefer to insert allocas.
106 : llvm::AssertingVH<llvm::Instruction> AllocaInsertPt;
107 :
108 : const llvm::Type *LLVMIntTy;
109 : uint32_t LLVMPointerWidth;
110 :
111 : bool Exceptions;
112 : bool CatchUndefined;
113 : public:
114 : /// ObjCEHValueStack - Stack of Objective-C exception values, used for
115 : /// rethrows.
116 : llvm::SmallVector<llvm::Value*, 8> ObjCEHValueStack;
117 :
118 : /// PushCleanupBlock - Push a new cleanup entry on the stack and set the
119 : /// passed in block as the cleanup block.
120 : void PushCleanupBlock(llvm::BasicBlock *CleanupEntryBlock,
121 : llvm::BasicBlock *CleanupExitBlock,
122 : llvm::BasicBlock *PreviousInvokeDest,
123 : bool EHOnly = false);
124 177: void PushCleanupBlock(llvm::BasicBlock *CleanupEntryBlock) {
125 177: PushCleanupBlock(CleanupEntryBlock, 0, getInvokeDest(), false);
126 177: }
127 :
128 : /// CleanupBlockInfo - A struct representing a popped cleanup block.
129 : struct CleanupBlockInfo {
130 : /// CleanupEntryBlock - the cleanup entry block
131 : llvm::BasicBlock *CleanupBlock;
132 :
133 : /// SwitchBlock - the block (if any) containing the switch instruction used
134 : /// for jumping to the final destination.
135 : llvm::BasicBlock *SwitchBlock;
136 :
137 : /// EndBlock - the default destination for the switch instruction.
138 : llvm::BasicBlock *EndBlock;
139 :
140 : /// EHOnly - True iff this cleanup should only be performed on the
141 : /// exceptional edge.
142 : bool EHOnly;
143 :
144 : CleanupBlockInfo(llvm::BasicBlock *cb, llvm::BasicBlock *sb,
145 277: llvm::BasicBlock *eb, bool ehonly = false)
146 277: : CleanupBlock(cb), SwitchBlock(sb), EndBlock(eb), EHOnly(ehonly) {}
147 : };
148 :
149 : /// EHCleanupBlock - RAII object that will create a cleanup block for the
150 : /// exceptional edge and set the insert point to that block. When destroyed,
151 : /// it creates the cleanup edge and sets the insert point to the previous
152 : /// block.
153 : class EHCleanupBlock {
154 : CodeGenFunction& CGF;
155 : llvm::BasicBlock *Cont;
156 : llvm::BasicBlock *CleanupHandler;
157 : llvm::BasicBlock *CleanupEntryBB;
158 : llvm::BasicBlock *PreviousInvokeDest;
159 : public:
160 7: EHCleanupBlock(CodeGenFunction &cgf)
161 : : CGF(cgf), Cont(CGF.createBasicBlock("cont")),
162 : CleanupHandler(CGF.createBasicBlock("ehcleanup")),
163 : CleanupEntryBB(CGF.createBasicBlock("ehcleanup.rest")),
164 7: PreviousInvokeDest(CGF.getInvokeDest()) {
165 7: CGF.EmitBranch(Cont);
166 7: llvm::BasicBlock *TerminateHandler = CGF.getTerminateHandler();
167 7: CGF.Builder.SetInsertPoint(CleanupEntryBB);
168 7: CGF.setInvokeDest(TerminateHandler);
169 7: }
170 : ~EHCleanupBlock();
171 : };
172 :
173 : /// PopCleanupBlock - Will pop the cleanup entry on the stack, process all
174 : /// branch fixups and return a block info struct with the switch block and end
175 : /// block. This will also reset the invoke handler to the previous value
176 : /// from when the cleanup block was created.
177 : CleanupBlockInfo PopCleanupBlock();
178 :
179 : /// DelayedCleanupBlock - RAII object that will create a cleanup block and set
180 : /// the insert point to that block. When destructed, it sets the insert point
181 : /// to the previous block and pushes a new cleanup entry on the stack.
182 : class DelayedCleanupBlock {
183 : CodeGenFunction& CGF;
184 : llvm::BasicBlock *CurBB;
185 : llvm::BasicBlock *CleanupEntryBB;
186 : llvm::BasicBlock *CleanupExitBB;
187 : llvm::BasicBlock *CurInvokeDest;
188 : bool EHOnly;
189 :
190 : public:
191 100: DelayedCleanupBlock(CodeGenFunction &cgf, bool ehonly = false)
192 : : CGF(cgf), CurBB(CGF.Builder.GetInsertBlock()),
193 : CleanupEntryBB(CGF.createBasicBlock("cleanup")), CleanupExitBB(0),
194 : CurInvokeDest(CGF.getInvokeDest()),
195 100: EHOnly(ehonly) {
196 100: CGF.Builder.SetInsertPoint(CleanupEntryBB);
197 100: }
198 :
199 61: llvm::BasicBlock *getCleanupExitBlock() {
61: branch 0 taken
0: branch 1 not taken
200 61: if (!CleanupExitBB)
201 61: CleanupExitBB = CGF.createBasicBlock("cleanup.exit");
202 61: return CleanupExitBB;
203 : }
204 :
205 100: ~DelayedCleanupBlock() {
206 : CGF.PushCleanupBlock(CleanupEntryBB, CleanupExitBB, CurInvokeDest,
207 100: EHOnly);
208 : // FIXME: This is silly, move this into the builder.
100: branch 0 taken
0: branch 1 not taken
209 100: if (CurBB)
210 100: CGF.Builder.SetInsertPoint(CurBB);
211 : else
212 0: CGF.Builder.ClearInsertionPoint();
213 100: }
214 : };
215 :
216 : /// \brief Enters a new scope for capturing cleanups, all of which will be
217 : /// executed once the scope is exited.
218 : class CleanupScope {
219 : CodeGenFunction& CGF;
220 : size_t CleanupStackDepth;
221 : bool OldDidCallStackSave;
222 : bool PerformCleanup;
223 :
224 : CleanupScope(const CleanupScope &); // DO NOT IMPLEMENT
225 : CleanupScope &operator=(const CleanupScope &); // DO NOT IMPLEMENT
226 :
227 : public:
228 : /// \brief Enter a new cleanup scope.
229 3447: explicit CleanupScope(CodeGenFunction &CGF)
230 3447: : CGF(CGF), PerformCleanup(true)
231 : {
232 3447: CleanupStackDepth = CGF.CleanupEntries.size();
233 3447: OldDidCallStackSave = CGF.DidCallStackSave;
234 3447: }
235 :
236 : /// \brief Exit this cleanup scope, emitting any accumulated
237 : /// cleanups.
238 3447: ~CleanupScope() {
3443: branch 0 taken
4: branch 1 taken
239 3447: if (PerformCleanup) {
240 3443: CGF.DidCallStackSave = OldDidCallStackSave;
241 3443: CGF.EmitCleanupBlocks(CleanupStackDepth);
242 : }
243 3447: }
244 :
245 : /// \brief Determine whether this scope requires any cleanups.
246 6: bool requiresCleanups() const {
247 6: return CGF.CleanupEntries.size() > CleanupStackDepth;
248 : }
249 :
250 : /// \brief Force the emission of cleanups now, instead of waiting
251 : /// until this object is destroyed.
252 4: void ForceCleanup() {
0: branch 0 not taken
4: branch 1 taken
253 4: assert(PerformCleanup && "Already forced cleanup");
254 4: CGF.DidCallStackSave = OldDidCallStackSave;
255 4: CGF.EmitCleanupBlocks(CleanupStackDepth);
256 4: PerformCleanup = false;
257 4: }
258 : };
259 :
260 : /// EmitCleanupBlocks - Takes the old cleanup stack size and emits the cleanup
261 : /// blocks that have been added.
262 : void EmitCleanupBlocks(size_t OldCleanupStackSize);
263 :
264 : /// EmitBranchThroughCleanup - Emit a branch from the current insert block
265 : /// through the cleanup handling code (if any) and then on to \arg Dest.
266 : ///
267 : /// FIXME: Maybe this should really be in EmitBranch? Don't we always want
268 : /// this behavior for branches?
269 : void EmitBranchThroughCleanup(llvm::BasicBlock *Dest);
270 :
271 : /// BeginConditionalBranch - Should be called before a conditional part of an
272 : /// expression is emitted. For example, before the RHS of the expression below
273 : /// is emitted:
274 : ///
275 : /// b && f(T());
276 : ///
277 : /// This is used to make sure that any temporaries created in the conditional
278 : /// branch are only destroyed if the branch is taken.
279 107: void BeginConditionalBranch() {
280 107: ++ConditionalBranchLevel;
281 107: }
282 :
283 : /// EndConditionalBranch - Should be called after a conditional part of an
284 : /// expression has been emitted.
285 107: void EndConditionalBranch() {
286 : assert(ConditionalBranchLevel != 0 &&
0: branch 0 not taken
107: branch 1 taken
287 107: "Conditional branch mismatch!");
288 :
289 107: --ConditionalBranchLevel;
290 107: }
291 :
292 : private:
293 : CGDebugInfo *DebugInfo;
294 :
295 : /// IndirectBranch - The first time an indirect goto is seen we create a block
296 : /// with an indirect branch. Every time we see the address of a label taken,
297 : /// we add the label to the indirect goto. Every subsequent indirect goto is
298 : /// codegen'd as a jump to the IndirectBranch's basic block.
299 : llvm::IndirectBrInst *IndirectBranch;
300 :
301 : /// LocalDeclMap - This keeps track of the LLVM allocas or globals for local C
302 : /// decls.
303 : llvm::DenseMap<const Decl*, llvm::Value*> LocalDeclMap;
304 :
305 : /// LabelMap - This keeps track of the LLVM basic block for each C label.
306 : llvm::DenseMap<const LabelStmt*, llvm::BasicBlock*> LabelMap;
307 :
308 : // BreakContinueStack - This keeps track of where break and continue
309 : // statements should jump to.
310 187: struct BreakContinue {
311 187: BreakContinue(llvm::BasicBlock *bb, llvm::BasicBlock *cb)
312 187: : BreakBlock(bb), ContinueBlock(cb) {}
313 :
314 : llvm::BasicBlock *BreakBlock;
315 : llvm::BasicBlock *ContinueBlock;
316 : };
317 : llvm::SmallVector<BreakContinue, 8> BreakContinueStack;
318 :
319 : /// SwitchInsn - This is nearest current switch instruction. It is null if if
320 : /// current context is not in a switch.
321 : llvm::SwitchInst *SwitchInsn;
322 :
323 : /// CaseRangeBlock - This block holds if condition check for last case
324 : /// statement range in current switch instruction.
325 : llvm::BasicBlock *CaseRangeBlock;
326 :
327 : /// InvokeDest - This is the nearest exception target for calls
328 : /// which can unwind, when exceptions are being used.
329 : llvm::BasicBlock *InvokeDest;
330 :
331 : // VLASizeMap - This keeps track of the associated size for each VLA type.
332 : // We track this by the size expression rather than the type itself because
333 : // in certain situations, like a const qualifier applied to an VLA typedef,
334 : // multiple VLA types can share the same size expression.
335 : // FIXME: Maybe this could be a stack of maps that is pushed/popped as we
336 : // enter/leave scopes.
337 : llvm::DenseMap<const Expr*, llvm::Value*> VLASizeMap;
338 :
339 : /// DidCallStackSave - Whether llvm.stacksave has been called. Used to avoid
340 : /// calling llvm.stacksave for multiple VLAs in the same scope.
341 : bool DidCallStackSave;
342 :
343 831: struct CleanupEntry {
344 : /// CleanupEntryBlock - The block of code that does the actual cleanup.
345 : llvm::BasicBlock *CleanupEntryBlock;
346 :
347 : /// CleanupExitBlock - The cleanup exit block.
348 : llvm::BasicBlock *CleanupExitBlock;
349 :
350 : /// Blocks - Basic blocks that were emitted in the current cleanup scope.
351 : std::vector<llvm::BasicBlock *> Blocks;
352 :
353 : /// BranchFixups - Branch instructions to basic blocks that haven't been
354 : /// inserted into the current function yet.
355 : std::vector<llvm::BranchInst *> BranchFixups;
356 :
357 : /// PreviousInvokeDest - The invoke handler from the start of the cleanup
358 : /// region.
359 : llvm::BasicBlock *PreviousInvokeDest;
360 :
361 : /// EHOnly - Perform this only on the exceptional edge, not the main edge.
362 : bool EHOnly;
363 :
364 : explicit CleanupEntry(llvm::BasicBlock *CleanupEntryBlock,
365 : llvm::BasicBlock *CleanupExitBlock,
366 : llvm::BasicBlock *PreviousInvokeDest,
367 277: bool ehonly)
368 : : CleanupEntryBlock(CleanupEntryBlock),
369 : CleanupExitBlock(CleanupExitBlock),
370 : PreviousInvokeDest(PreviousInvokeDest),
371 277: EHOnly(ehonly) {}
372 : };
373 :
374 : /// CleanupEntries - Stack of cleanup entries.
375 : llvm::SmallVector<CleanupEntry, 8> CleanupEntries;
376 :
377 : typedef llvm::DenseMap<llvm::BasicBlock*, size_t> BlockScopeMap;
378 :
379 : /// BlockScopes - Map of which "cleanup scope" scope basic blocks have.
380 : BlockScopeMap BlockScopes;
381 :
382 : /// CXXThisDecl - When generating code for a C++ member function,
383 : /// this will hold the implicit 'this' declaration.
384 : ImplicitParamDecl *CXXThisDecl;
385 :
386 : /// CXXVTTDecl - When generating code for a base object constructor or
387 : /// base object destructor with virtual bases, this will hold the implicit
388 : /// VTT parameter.
389 : ImplicitParamDecl *CXXVTTDecl;
390 :
391 : /// CXXLiveTemporaryInfo - Holds information about a live C++ temporary.
392 62: struct CXXLiveTemporaryInfo {
393 : /// Temporary - The live temporary.
394 : const CXXTemporary *Temporary;
395 :
396 : /// ThisPtr - The pointer to the temporary.
397 : llvm::Value *ThisPtr;
398 :
399 : /// DtorBlock - The destructor block.
400 : llvm::BasicBlock *DtorBlock;
401 :
402 : /// CondPtr - If this is a conditional temporary, this is the pointer to the
403 : /// condition variable that states whether the destructor should be called
404 : /// or not.
405 : llvm::Value *CondPtr;
406 :
407 : CXXLiveTemporaryInfo(const CXXTemporary *temporary,
408 : llvm::Value *thisptr, llvm::BasicBlock *dtorblock,
409 62: llvm::Value *condptr)
410 : : Temporary(temporary), ThisPtr(thisptr), DtorBlock(dtorblock),
411 62: CondPtr(condptr) { }
412 : };
413 :
414 : llvm::SmallVector<CXXLiveTemporaryInfo, 4> LiveTemporaries;
415 :
416 : /// ConditionalBranchLevel - Contains the nesting level of the current
417 : /// conditional branch. This is used so that we know if a temporary should be
418 : /// destroyed conditionally.
419 : unsigned ConditionalBranchLevel;
420 :
421 :
422 : /// ByrefValueInfoMap - For each __block variable, contains a pair of the LLVM
423 : /// type as well as the field number that contains the actual data.
424 : llvm::DenseMap<const ValueDecl *, std::pair<const llvm::Type *,
425 : unsigned> > ByRefValueInfo;
426 :
427 : /// getByrefValueFieldNumber - Given a declaration, returns the LLVM field
428 : /// number that holds the value.
429 : unsigned getByRefValueLLVMField(const ValueDecl *VD) const;
430 :
431 : llvm::BasicBlock *TerminateHandler;
432 : llvm::BasicBlock *TrapBB;
433 :
434 : int UniqueAggrDestructorCount;
435 : public:
436 : CodeGenFunction(CodeGenModule &cgm);
437 :
438 : ASTContext &getContext() const;
439 18128: CGDebugInfo *getDebugInfo() { return DebugInfo; }
440 :
441 3171: llvm::BasicBlock *getInvokeDest() { return InvokeDest; }
442 326: void setInvokeDest(llvm::BasicBlock *B) { InvokeDest = B; }
443 :
444 12709: llvm::LLVMContext &getLLVMContext() { return VMContext; }
445 :
446 : //===--------------------------------------------------------------------===//
447 : // Objective-C
448 : //===--------------------------------------------------------------------===//
449 :
450 : void GenerateObjCMethod(const ObjCMethodDecl *OMD);
451 :
452 : void StartObjCMethod(const ObjCMethodDecl *MD,
453 : const ObjCContainerDecl *CD);
454 :
455 : /// GenerateObjCGetter - Synthesize an Objective-C property getter function.
456 : void GenerateObjCGetter(ObjCImplementationDecl *IMP,
457 : const ObjCPropertyImplDecl *PID);
458 :
459 : /// GenerateObjCSetter - Synthesize an Objective-C property setter function
460 : /// for the given property.
461 : void GenerateObjCSetter(ObjCImplementationDecl *IMP,
462 : const ObjCPropertyImplDecl *PID);
463 :
464 : //===--------------------------------------------------------------------===//
465 : // Block Bits
466 : //===--------------------------------------------------------------------===//
467 :
468 : llvm::Value *BuildBlockLiteralTmp(const BlockExpr *);
469 : llvm::Constant *BuildDescriptorBlockDecl(bool BlockHasCopyDispose,
470 : CharUnits Size,
471 : const llvm::StructType *,
472 : std::vector<HelperInfo> *);
473 :
474 : llvm::Function *GenerateBlockFunction(const BlockExpr *BExpr,
475 : const BlockInfo& Info,
476 : const Decl *OuterFuncDecl,
477 : llvm::DenseMap<const Decl*, llvm::Value*> ldm,
478 : CharUnits &Size, CharUnits &Align,
479 : llvm::SmallVector<const Expr *, 8> &subBlockDeclRefDecls,
480 : bool &subBlockHasCopyDispose);
481 :
482 : void BlockForwardSelf();
483 : llvm::Value *LoadBlockStruct();
484 :
485 : CharUnits AllocateBlockDecl(const BlockDeclRefExpr *E);
486 : llvm::Value *GetAddrOfBlockDecl(const BlockDeclRefExpr *E);
487 : const llvm::Type *BuildByRefType(const ValueDecl *D);
488 :
489 : void GenerateCode(GlobalDecl GD, llvm::Function *Fn);
490 : void StartFunction(GlobalDecl GD, QualType RetTy,
491 : llvm::Function *Fn,
492 : const FunctionArgList &Args,
493 : SourceLocation StartLoc);
494 :
495 : /// EmitReturnBlock - Emit the unified return block, trying to avoid its
496 : /// emission when possible.
497 : void EmitReturnBlock();
498 :
499 : /// FinishFunction - Complete IR generation of the current function. It is
500 : /// legal to call this function even if there is no current insertion point.
501 : void FinishFunction(SourceLocation EndLoc=SourceLocation());
502 :
503 : /// DynamicTypeAdjust - Do the non-virtual and virtual adjustments on an
504 : /// object pointer to alter the dynamic type of the pointer. Used by
505 : /// GenerateCovariantThunk for building thunks.
506 : llvm::Value *DynamicTypeAdjust(llvm::Value *V,
507 : const ThunkAdjustment &Adjustment);
508 :
509 : /// GenerateThunk - Generate a thunk for the given method
510 : llvm::Constant *GenerateThunk(llvm::Function *Fn, GlobalDecl GD,
511 : bool Extern,
512 : const ThunkAdjustment &ThisAdjustment);
513 : llvm::Constant *
514 : GenerateCovariantThunk(llvm::Function *Fn, GlobalDecl GD,
515 : bool Extern,
516 : const CovariantThunkAdjustment &Adjustment);
517 :
518 : void EmitCtorPrologue(const CXXConstructorDecl *CD, CXXCtorType Type);
519 :
520 : void InitializeVtablePtrs(const CXXRecordDecl *ClassDecl);
521 :
522 : void InitializeVtablePtrsRecursive(const CXXRecordDecl *ClassDecl,
523 : llvm::Constant *Vtable,
524 : CGVtableInfo::AddrSubMap_t& AddressPoints,
525 : llvm::Value *ThisPtr,
526 : uint64_t Offset);
527 :
528 : void SynthesizeCXXCopyConstructor(const CXXConstructorDecl *Ctor,
529 : CXXCtorType Type,
530 : llvm::Function *Fn,
531 : const FunctionArgList &Args);
532 :
533 : void SynthesizeCXXCopyAssignment(const CXXMethodDecl *CD,
534 : llvm::Function *Fn,
535 : const FunctionArgList &Args);
536 :
537 : void SynthesizeDefaultConstructor(const CXXConstructorDecl *Ctor,
538 : CXXCtorType Type,
539 : llvm::Function *Fn,
540 : const FunctionArgList &Args);
541 :
542 : void SynthesizeDefaultDestructor(const CXXDestructorDecl *Dtor,
543 : CXXDtorType Type,
544 : llvm::Function *Fn,
545 : const FunctionArgList &Args);
546 :
547 : /// EmitDtorEpilogue - Emit all code that comes at the end of class's
548 : /// destructor. This is to call destructors on members and base classes in
549 : /// reverse order of their construction.
550 : void EmitDtorEpilogue(const CXXDestructorDecl *Dtor,
551 : CXXDtorType Type);
552 :
553 : /// EmitFunctionProlog - Emit the target specific LLVM code to load the
554 : /// arguments for the given function. This is also responsible for naming the
555 : /// LLVM function arguments.
556 : void EmitFunctionProlog(const CGFunctionInfo &FI,
557 : llvm::Function *Fn,
558 : const FunctionArgList &Args);
559 :
560 : /// EmitFunctionEpilog - Emit the target specific LLVM code to return the
561 : /// given temporary.
562 : void EmitFunctionEpilog(const CGFunctionInfo &FI, llvm::Value *ReturnValue);
563 :
564 : /// EmitStartEHSpec - Emit the start of the exception spec.
565 : void EmitStartEHSpec(const Decl *D);
566 :
567 : /// EmitEndEHSpec - Emit the end of the exception spec.
568 : void EmitEndEHSpec(const Decl *D);
569 :
570 : /// getTerminateHandler - Return a handler that just calls terminate.
571 : llvm::BasicBlock *getTerminateHandler();
572 :
573 : const llvm::Type *ConvertTypeForMem(QualType T);
574 : const llvm::Type *ConvertType(QualType T);
575 :
576 : /// LoadObjCSelf - Load the value of self. This function is only valid while
577 : /// generating code for an Objective-C method.
578 : llvm::Value *LoadObjCSelf();
579 :
580 : /// TypeOfSelfObject - Return type of object that this self represents.
581 : QualType TypeOfSelfObject();
582 :
583 : /// hasAggregateLLVMType - Return true if the specified AST type will map into
584 : /// an aggregate LLVM type or is void.
585 : static bool hasAggregateLLVMType(QualType T);
586 :
587 : /// createBasicBlock - Create an LLVM basic block.
588 : llvm::BasicBlock *createBasicBlock(const char *Name="",
589 : llvm::Function *Parent=0,
590 8881: llvm::BasicBlock *InsertBefore=0) {
591 : #ifdef NDEBUG
592 : return llvm::BasicBlock::Create(VMContext, "", Parent, InsertBefore);
593 : #else
594 8881: return llvm::BasicBlock::Create(VMContext, Name, Parent, InsertBefore);
595 : #endif
596 : }
597 :
598 : /// getBasicBlockForLabel - Return the LLVM basicblock that the specified
599 : /// label maps to.
600 : llvm::BasicBlock *getBasicBlockForLabel(const LabelStmt *S);
601 :
602 : /// SimplifyForwardingBlocks - If the given basic block is only a branch to
603 : /// another basic block, simplify it. This assumes that no other code could
604 : /// potentially reference the basic block.
605 : void SimplifyForwardingBlocks(llvm::BasicBlock *BB);
606 :
607 : /// EmitBlock - Emit the given block \arg BB and set it as the insert point,
608 : /// adding a fall-through branch from the current insert block if
609 : /// necessary. It is legal to call this function even if there is no current
610 : /// insertion point.
611 : ///
612 : /// IsFinished - If true, indicates that the caller has finished emitting
613 : /// branches to the given block and does not expect to emit code into it. This
614 : /// means the block can be ignored if it is unreachable.
615 : void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false);
616 :
617 : /// EmitBranch - Emit a branch to the specified basic block from the current
618 : /// insert block, taking care to avoid creation of branches from dummy
619 : /// blocks. It is legal to call this function even if there is no current
620 : /// insertion point.
621 : ///
622 : /// This function clears the current insertion point. The caller should follow
623 : /// calls to this function with calls to Emit*Block prior to generation new
624 : /// code.
625 : void EmitBranch(llvm::BasicBlock *Block);
626 :
627 : /// HaveInsertPoint - True if an insertion point is defined. If not, this
628 : /// indicates that the current code being emitted is unreachable.
629 6435: bool HaveInsertPoint() const {
630 6435: return Builder.GetInsertBlock() != 0;
631 : }
632 :
633 : /// EnsureInsertPoint - Ensure that an insertion point is defined so that
634 : /// emitted IR has a place to go. Note that by definition, if this function
635 : /// creates a block then that block is unreachable; callers may do better to
636 : /// detect when no insertion point is defined and simply skip IR generation.
637 297: void EnsureInsertPoint() {
230: branch 2 taken
0: branch 2 not taken
638 297: if (!HaveInsertPoint())
639 67: EmitBlock(createBasicBlock());
640 297: }
641 :
642 : /// ErrorUnsupported - Print out an error that codegen doesn't support the
643 : /// specified stmt yet.
644 : void ErrorUnsupported(const Stmt *S, const char *Type,
645 : bool OmitOnError=false);
646 :
647 : //===--------------------------------------------------------------------===//
648 : // Helpers
649 : //===--------------------------------------------------------------------===//
650 :
651 7376: Qualifiers MakeQualifiers(QualType T) {
652 7376: Qualifiers Quals = getContext().getCanonicalType(T).getQualifiers();
653 7376: Quals.setObjCGCAttr(getContext().getObjCGCAttrKind(T));
654 : return Quals;
655 : }
656 :
657 : /// CreateTempAlloca - This creates a alloca and inserts it into the entry
658 : /// block. The caller is responsible for setting an appropriate alignment on
659 : /// the alloca.
660 : llvm::AllocaInst *CreateTempAlloca(const llvm::Type *Ty,
661 : const llvm::Twine &Name = "tmp");
662 :
663 : /// CreateMemTemp - Create a temporary memory object of the given type, with
664 : /// appropriate alignment.
665 : llvm::Value *CreateMemTemp(QualType T, const llvm::Twine &Name = "tmp");
666 :
667 : /// EvaluateExprAsBool - Perform the usual unary conversions on the specified
668 : /// expression and compare the result against zero, returning an Int1Ty value.
669 : llvm::Value *EvaluateExprAsBool(const Expr *E);
670 :
671 : /// EmitAnyExpr - Emit code to compute the specified expression which can have
672 : /// any type. The result is returned as an RValue struct. If this is an
673 : /// aggregate expression, the aggloc/agglocvolatile arguments indicate where
674 : /// the result should be returned.
675 : ///
676 : /// \param IgnoreResult - True if the resulting value isn't used.
677 : RValue EmitAnyExpr(const Expr *E, llvm::Value *AggLoc = 0,
678 : bool IsAggLocVolatile = false, bool IgnoreResult = false,
679 : bool IsInitializer = false);
680 :
681 : // EmitVAListRef - Emit a "reference" to a va_list; this is either the address
682 : // or the value of the expression, depending on how va_list is defined.
683 : llvm::Value *EmitVAListRef(const Expr *E);
684 :
685 : /// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result will
686 : /// always be accessible even if no aggregate location is provided.
687 : RValue EmitAnyExprToTemp(const Expr *E, bool IsAggLocVolatile = false,
688 : bool IsInitializer = false);
689 :
690 : /// EmitAggregateCopy - Emit an aggrate copy.
691 : ///
692 : /// \param isVolatile - True iff either the source or the destination is
693 : /// volatile.
694 : void EmitAggregateCopy(llvm::Value *DestPtr, llvm::Value *SrcPtr,
695 : QualType EltTy, bool isVolatile=false);
696 :
697 : void EmitAggregateClear(llvm::Value *DestPtr, QualType Ty);
698 :
699 : /// StartBlock - Start new block named N. If insert block is a dummy block
700 : /// then reuse it.
701 : void StartBlock(const char *N);
702 :
703 : /// GetAddrOfStaticLocalVar - Return the address of a static local variable.
704 : llvm::Constant *GetAddrOfStaticLocalVar(const VarDecl *BVD);
705 :
706 : /// GetAddrOfLocalVar - Return the address of a local variable.
707 : llvm::Value *GetAddrOfLocalVar(const VarDecl *VD);
708 :
709 : /// getAccessedFieldNo - Given an encoded value and a result number, return
710 : /// the input field number being accessed.
711 : static unsigned getAccessedFieldNo(unsigned Idx, const llvm::Constant *Elts);
712 :
713 : llvm::BlockAddress *GetAddrOfLabel(const LabelStmt *L);
714 : llvm::BasicBlock *GetIndirectGotoBlock();
715 :
716 : /// EmitMemSetToZero - Generate code to memset a value of the given type to 0.
717 : void EmitMemSetToZero(llvm::Value *DestPtr, QualType Ty);
718 :
719 : // EmitVAArg - Generate code to get an argument from the passed in pointer
720 : // and update it accordingly. The return value is a pointer to the argument.
721 : // FIXME: We should be able to get rid of this method and use the va_arg
722 : // instruction in LLVM instead once it works well enough.
723 : llvm::Value *EmitVAArg(llvm::Value *VAListAddr, QualType Ty);
724 :
725 : /// EmitVLASize - Generate code for any VLA size expressions that might occur
726 : /// in a variably modified type. If Ty is a VLA, will return the value that
727 : /// corresponds to the size in bytes of the VLA type. Will return 0 otherwise.
728 : ///
729 : /// This function can be called with a null (unreachable) insert point.
730 : llvm::Value *EmitVLASize(QualType Ty);
731 :
732 : // GetVLASize - Returns an LLVM value that corresponds to the size in bytes
733 : // of a variable length array type.
734 : llvm::Value *GetVLASize(const VariableArrayType *);
735 :
736 : /// LoadCXXThis - Load the value of 'this'. This function is only valid while
737 : /// generating code for an C++ member function.
738 : llvm::Value *LoadCXXThis();
739 :
740 : /// LoadCXXVTT - Load the VTT parameter to base constructors/destructors have
741 : /// virtual bases.
742 : llvm::Value *LoadCXXVTT();
743 :
744 : /// GetAddressOfBaseClass - This function will add the necessary delta to the
745 : /// load of 'this' and returns address of the base class.
746 : // FIXME. This currently only does a derived to non-virtual base conversion.
747 : // Other kinds of conversions will come later.
748 : llvm::Value *GetAddressOfBaseClass(llvm::Value *Value,
749 : const CXXRecordDecl *ClassDecl,
750 : const CXXRecordDecl *BaseClassDecl,
751 : bool NullCheckValue);
752 :
753 : llvm::Value *GetAddressOfDerivedClass(llvm::Value *Value,
754 : const CXXRecordDecl *ClassDecl,
755 : const CXXRecordDecl *DerivedClassDecl,
756 : bool NullCheckValue);
757 :
758 : llvm::Value *GetVirtualBaseClassOffset(llvm::Value *This,
759 : const CXXRecordDecl *ClassDecl,
760 : const CXXRecordDecl *BaseClassDecl);
761 :
762 : void EmitClassAggrMemberwiseCopy(llvm::Value *DestValue,
763 : llvm::Value *SrcValue,
764 : const ArrayType *Array,
765 : const CXXRecordDecl *BaseClassDecl,
766 : QualType Ty);
767 :
768 : void EmitClassAggrCopyAssignment(llvm::Value *DestValue,
769 : llvm::Value *SrcValue,
770 : const ArrayType *Array,
771 : const CXXRecordDecl *BaseClassDecl,
772 : QualType Ty);
773 :
774 : void EmitClassMemberwiseCopy(llvm::Value *DestValue, llvm::Value *SrcValue,
775 : const CXXRecordDecl *ClassDecl,
776 : const CXXRecordDecl *BaseClassDecl,
777 : QualType Ty);
778 :
779 : void EmitClassCopyAssignment(llvm::Value *DestValue, llvm::Value *SrcValue,
780 : const CXXRecordDecl *ClassDecl,
781 : const CXXRecordDecl *BaseClassDecl,
782 : QualType Ty);
783 :
784 : void EmitCXXConstructorCall(const CXXConstructorDecl *D, CXXCtorType Type,
785 : llvm::Value *This,
786 : CallExpr::const_arg_iterator ArgBeg,
787 : CallExpr::const_arg_iterator ArgEnd);
788 :
789 : void EmitCXXAggrConstructorCall(const CXXConstructorDecl *D,
790 : const ConstantArrayType *ArrayTy,
791 : llvm::Value *ArrayPtr,
792 : CallExpr::const_arg_iterator ArgBeg,
793 : CallExpr::const_arg_iterator ArgEnd);
794 :
795 : void EmitCXXAggrConstructorCall(const CXXConstructorDecl *D,
796 : llvm::Value *NumElements,
797 : llvm::Value *ArrayPtr,
798 : CallExpr::const_arg_iterator ArgBeg,
799 : CallExpr::const_arg_iterator ArgEnd);
800 :
801 : void EmitCXXAggrDestructorCall(const CXXDestructorDecl *D,
802 : const ArrayType *Array,
803 : llvm::Value *This);
804 :
805 : void EmitCXXAggrDestructorCall(const CXXDestructorDecl *D,
806 : llvm::Value *NumElements,
807 : llvm::Value *This);
808 :
809 : llvm::Constant *GenerateCXXAggrDestructorHelper(const CXXDestructorDecl *D,
810 : const ArrayType *Array,
811 : llvm::Value *This);
812 :
813 : void EmitCXXDestructorCall(const CXXDestructorDecl *D, CXXDtorType Type,
814 : llvm::Value *This);
815 :
816 : void PushCXXTemporary(const CXXTemporary *Temporary, llvm::Value *Ptr);
817 : void PopCXXTemporary();
818 :
819 : llvm::Value *EmitCXXNewExpr(const CXXNewExpr *E);
820 : void EmitCXXDeleteExpr(const CXXDeleteExpr *E);
821 :
822 : void EmitDeleteCall(const FunctionDecl *DeleteFD, llvm::Value *Ptr,
823 : QualType DeleteTy);
824 :
825 : llvm::Value* EmitCXXTypeidExpr(const CXXTypeidExpr *E);
826 : llvm::Value *EmitDynamicCast(llvm::Value *V, const CXXDynamicCastExpr *DCE);
827 :
828 : void EmitCheck(llvm::Value *, unsigned Size);
829 :
830 : llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
831 : bool isInc, bool isPre);
832 : ComplexPairTy EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
833 : bool isInc, bool isPre);
834 : //===--------------------------------------------------------------------===//
835 : // Declaration Emission
836 : //===--------------------------------------------------------------------===//
837 :
838 : /// EmitDecl - Emit a declaration.
839 : ///
840 : /// This function can be called with a null (unreachable) insert point.
841 : void EmitDecl(const Decl &D);
842 :
843 : /// EmitBlockVarDecl - Emit a block variable declaration.
844 : ///
845 : /// This function can be called with a null (unreachable) insert point.
846 : void EmitBlockVarDecl(const VarDecl &D);
847 :
848 : /// EmitLocalBlockVarDecl - Emit a local block variable declaration.
849 : ///
850 : /// This function can be called with a null (unreachable) insert point.
851 : void EmitLocalBlockVarDecl(const VarDecl &D);
852 :
853 : void EmitStaticBlockVarDecl(const VarDecl &D,
854 : llvm::GlobalValue::LinkageTypes Linkage);
855 :
856 : /// EmitParmDecl - Emit a ParmVarDecl or an ImplicitParamDecl.
857 : void EmitParmDecl(const VarDecl &D, llvm::Value *Arg);
858 :
859 : //===--------------------------------------------------------------------===//
860 : // Statement Emission
861 : //===--------------------------------------------------------------------===//
862 :
863 : /// EmitStopPoint - Emit a debug stoppoint if we are emitting debug info.
864 : void EmitStopPoint(const Stmt *S);
865 :
866 : /// EmitStmt - Emit the code for the statement \arg S. It is legal to call
867 : /// this function even if there is no current insertion point.
868 : ///
869 : /// This function may clear the current insertion point; callers should use
870 : /// EnsureInsertPoint if they wish to subsequently generate code without first
871 : /// calling EmitBlock, EmitBranch, or EmitStmt.
872 : void EmitStmt(const Stmt *S);
873 :
874 : /// EmitSimpleStmt - Try to emit a "simple" statement which does not
875 : /// necessarily require an insertion point or debug information; typically
876 : /// because the statement amounts to a jump or a container of other
877 : /// statements.
878 : ///
879 : /// \return True if the statement was handled.
880 : bool EmitSimpleStmt(const Stmt *S);
881 :
882 : RValue EmitCompoundStmt(const CompoundStmt &S, bool GetLast = false,
883 : llvm::Value *AggLoc = 0, bool isAggVol = false);
884 :
885 : /// EmitLabel - Emit the block for the given label. It is legal to call this
886 : /// function even if there is no current insertion point.
887 : void EmitLabel(const LabelStmt &S); // helper for EmitLabelStmt.
888 :
889 : void EmitLabelStmt(const LabelStmt &S);
890 : void EmitGotoStmt(const GotoStmt &S);
891 : void EmitIndirectGotoStmt(const IndirectGotoStmt &S);
892 : void EmitIfStmt(const IfStmt &S);
893 : void EmitWhileStmt(const WhileStmt &S);
894 : void EmitDoStmt(const DoStmt &S);
895 : void EmitForStmt(const ForStmt &S);
896 : void EmitReturnStmt(const ReturnStmt &S);
897 : void EmitDeclStmt(const DeclStmt &S);
898 : void EmitBreakStmt(const BreakStmt &S);
899 : void EmitContinueStmt(const ContinueStmt &S);
900 : void EmitSwitchStmt(const SwitchStmt &S);
901 : void EmitDefaultStmt(const DefaultStmt &S);
902 : void EmitCaseStmt(const CaseStmt &S);
903 : void EmitCaseStmtRange(const CaseStmt &S);
904 : void EmitAsmStmt(const AsmStmt &S);
905 :
906 : void EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S);
907 : void EmitObjCAtTryStmt(const ObjCAtTryStmt &S);
908 : void EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S);
909 : void EmitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt &S);
910 :
911 : void EmitCXXTryStmt(const CXXTryStmt &S);
912 :
913 : //===--------------------------------------------------------------------===//
914 : // LValue Expression Emission
915 : //===--------------------------------------------------------------------===//
916 :
917 : /// GetUndefRValue - Get an appropriate 'undef' rvalue for the given type.
918 : RValue GetUndefRValue(QualType Ty);
919 :
920 : /// EmitUnsupportedRValue - Emit a dummy r-value using the type of E
921 : /// and issue an ErrorUnsupported style diagnostic (using the
922 : /// provided Name).
923 : RValue EmitUnsupportedRValue(const Expr *E,
924 : const char *Name);
925 :
926 : /// EmitUnsupportedLValue - Emit a dummy l-value using the type of E and issue
927 : /// an ErrorUnsupported style diagnostic (using the provided Name).
928 : LValue EmitUnsupportedLValue(const Expr *E,
929 : const char *Name);
930 :
931 : /// EmitLValue - Emit code to compute a designator that specifies the location
932 : /// of the expression.
933 : ///
934 : /// This can return one of two things: a simple address or a bitfield
935 : /// reference. In either case, the LLVM Value* in the LValue structure is
936 : /// guaranteed to be an LLVM pointer type.
937 : ///
938 : /// If this returns a bitfield reference, nothing about the pointee type of
939 : /// the LLVM value is known: For example, it may not be a pointer to an
940 : /// integer.
941 : ///
942 : /// If this returns a normal address, and if the lvalue's C type is fixed
943 : /// size, this method guarantees that the returned pointer type will point to
944 : /// an LLVM type of the same size of the lvalue's type. If the lvalue has a
945 : /// variable length type, this is not possible.
946 : ///
947 : LValue EmitLValue(const Expr *E);
948 :
949 : /// EmitCheckedLValue - Same as EmitLValue but additionally we generate
950 : /// checking code to guard against undefined behavior. This is only
951 : /// suitable when we know that the address will be used to access the
952 : /// object.
953 : LValue EmitCheckedLValue(const Expr *E);
954 :
955 : /// EmitLoadOfScalar - Load a scalar value from an address, taking
956 : /// care to appropriately convert from the memory representation to
957 : /// the LLVM value representation.
958 : llvm::Value *EmitLoadOfScalar(llvm::Value *Addr, bool Volatile,
959 : QualType Ty);
960 :
961 : /// EmitStoreOfScalar - Store a scalar value to an address, taking
962 : /// care to appropriately convert from the memory representation to
963 : /// the LLVM value representation.
964 : void EmitStoreOfScalar(llvm::Value *Value, llvm::Value *Addr,
965 : bool Volatile, QualType Ty);
966 :
967 : /// EmitLoadOfLValue - Given an expression that represents a value lvalue,
968 : /// this method emits the address of the lvalue, then loads the result as an
969 : /// rvalue, returning the rvalue.
970 : RValue EmitLoadOfLValue(LValue V, QualType LVType);
971 : RValue EmitLoadOfExtVectorElementLValue(LValue V, QualType LVType);
972 : RValue EmitLoadOfBitfieldLValue(LValue LV, QualType ExprType);
973 : RValue EmitLoadOfPropertyRefLValue(LValue LV, QualType ExprType);
974 : RValue EmitLoadOfKVCRefLValue(LValue LV, QualType ExprType);
975 :
976 :
977 : /// EmitStoreThroughLValue - Store the specified rvalue into the specified
978 : /// lvalue, where both are guaranteed to the have the same type, and that type
979 : /// is 'Ty'.
980 : void EmitStoreThroughLValue(RValue Src, LValue Dst, QualType Ty);
981 : void EmitStoreThroughExtVectorComponentLValue(RValue Src, LValue Dst,
982 : QualType Ty);
983 : void EmitStoreThroughPropertyRefLValue(RValue Src, LValue Dst, QualType Ty);
984 : void EmitStoreThroughKVCRefLValue(RValue Src, LValue Dst, QualType Ty);
985 :
986 : /// EmitStoreThroughLValue - Store Src into Dst with same constraints as
987 : /// EmitStoreThroughLValue.
988 : ///
989 : /// \param Result [out] - If non-null, this will be set to a Value* for the
990 : /// bit-field contents after the store, appropriate for use as the result of
991 : /// an assignment to the bit-field.
992 : void EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst, QualType Ty,
993 : llvm::Value **Result=0);
994 :
995 : // Note: only availabe for agg return types
996 : LValue EmitBinaryOperatorLValue(const BinaryOperator *E);
997 : // Note: only available for agg return types
998 : LValue EmitCallExprLValue(const CallExpr *E);
999 : // Note: only available for agg return types
1000 : LValue EmitVAArgExprLValue(const VAArgExpr *E);
1001 : LValue EmitDeclRefLValue(const DeclRefExpr *E);
1002 : LValue EmitStringLiteralLValue(const StringLiteral *E);
1003 : LValue EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E);
1004 : LValue EmitPredefinedFunctionName(unsigned Type);
1005 : LValue EmitPredefinedLValue(const PredefinedExpr *E);
1006 : LValue EmitUnaryOpLValue(const UnaryOperator *E);
1007 : LValue EmitArraySubscriptExpr(const ArraySubscriptExpr *E);
1008 : LValue EmitExtVectorElementExpr(const ExtVectorElementExpr *E);
1009 : LValue EmitMemberExpr(const MemberExpr *E);
1010 : LValue EmitObjCIsaExpr(const ObjCIsaExpr *E);
1011 : LValue EmitCompoundLiteralLValue(const CompoundLiteralExpr *E);
1012 : LValue EmitConditionalOperatorLValue(const ConditionalOperator *E);
1013 : LValue EmitCastLValue(const CastExpr *E);
1014 : LValue EmitNullInitializationLValue(const CXXZeroInitValueExpr *E);
1015 :
1016 : llvm::Value *EmitIvarOffset(const ObjCInterfaceDecl *Interface,
1017 : const ObjCIvarDecl *Ivar);
1018 : LValue EmitLValueForField(llvm::Value* Base, const FieldDecl* Field,
1019 : unsigned CVRQualifiers);
1020 :
1021 : /// EmitLValueForFieldInitialization - Like EmitLValueForField, except that
1022 : /// if the Field is a reference, this will return the address of the reference
1023 : /// and not the address of the value stored in the reference.
1024 : LValue EmitLValueForFieldInitialization(llvm::Value* Base,
1025 : const FieldDecl* Field,
1026 : unsigned CVRQualifiers);
1027 :
1028 : LValue EmitLValueForIvar(QualType ObjectTy,
1029 : llvm::Value* Base, const ObjCIvarDecl *Ivar,
1030 : unsigned CVRQualifiers);
1031 :
1032 : LValue EmitLValueForBitfield(llvm::Value* Base, const FieldDecl* Field,
1033 : unsigned CVRQualifiers);
1034 :
1035 : LValue EmitBlockDeclRefLValue(const BlockDeclRefExpr *E);
1036 :
1037 : LValue EmitCXXConstructLValue(const CXXConstructExpr *E);
1038 : LValue EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E);
1039 : LValue EmitCXXExprWithTemporariesLValue(const CXXExprWithTemporaries *E);
1040 : LValue EmitCXXTypeidLValue(const CXXTypeidExpr *E);
1041 :
1042 : LValue EmitObjCMessageExprLValue(const ObjCMessageExpr *E);
1043 : LValue EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E);
1044 : LValue EmitObjCPropertyRefLValue(const ObjCPropertyRefExpr *E);
1045 : LValue EmitObjCKVCRefLValue(const ObjCImplicitSetterGetterRefExpr *E);
1046 : LValue EmitObjCSuperExprLValue(const ObjCSuperExpr *E);
1047 : LValue EmitStmtExprLValue(const StmtExpr *E);
1048 : LValue EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E);
1049 :
1050 : //===--------------------------------------------------------------------===//
1051 : // Scalar Expression Emission
1052 : //===--------------------------------------------------------------------===//
1053 :
1054 : /// EmitCall - Generate a call of the given function, expecting the given
1055 : /// result type, and using the given argument list which specifies both the
1056 : /// LLVM arguments and the types they were derived from.
1057 : ///
1058 : /// \param TargetDecl - If given, the decl of the function in a direct call;
1059 : /// used to set attributes on the call (noreturn, etc.).
1060 : RValue EmitCall(const CGFunctionInfo &FnInfo,
1061 : llvm::Value *Callee,
1062 : ReturnValueSlot ReturnValue,
1063 : const CallArgList &Args,
1064 : const Decl *TargetDecl = 0);
1065 :
1066 : RValue EmitCall(QualType FnType, llvm::Value *Callee,
1067 : ReturnValueSlot ReturnValue,
1068 : CallExpr::const_arg_iterator ArgBeg,
1069 : CallExpr::const_arg_iterator ArgEnd,
1070 : const Decl *TargetDecl = 0);
1071 : RValue EmitCallExpr(const CallExpr *E,
1072 : ReturnValueSlot ReturnValue = ReturnValueSlot());
1073 :
1074 : llvm::Value *BuildVirtualCall(const CXXMethodDecl *MD, llvm::Value *This,
1075 : const llvm::Type *Ty);
1076 : llvm::Value *BuildVirtualCall(const CXXDestructorDecl *DD, CXXDtorType Type,
1077 : llvm::Value *&This, const llvm::Type *Ty);
1078 :
1079 : RValue EmitCXXMemberCall(const CXXMethodDecl *MD,
1080 : llvm::Value *Callee,
1081 : ReturnValueSlot ReturnValue,
1082 : llvm::Value *This,
1083 : llvm::Value *VTT,
1084 : CallExpr::const_arg_iterator ArgBeg,
1085 : CallExpr::const_arg_iterator ArgEnd);
1086 : RValue EmitCXXMemberCallExpr(const CXXMemberCallExpr *E,
1087 : ReturnValueSlot ReturnValue);
1088 : RValue EmitCXXMemberPointerCallExpr(const CXXMemberCallExpr *E,
1089 : ReturnValueSlot ReturnValue);
1090 :
1091 : RValue EmitCXXOperatorMemberCallExpr(const CXXOperatorCallExpr *E,
1092 : const CXXMethodDecl *MD,
1093 : ReturnValueSlot ReturnValue);
1094 :
1095 :
1096 : RValue EmitBuiltinExpr(const FunctionDecl *FD,
1097 : unsigned BuiltinID, const CallExpr *E);
1098 :
1099 : RValue EmitBlockCallExpr(const CallExpr *E, ReturnValueSlot ReturnValue);
1100 :
1101 : /// EmitTargetBuiltinExpr - Emit the given builtin call. Returns 0 if the call
1102 : /// is unhandled by the current target.
1103 : llvm::Value *EmitTargetBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
1104 :
1105 : llvm::Value *EmitX86BuiltinExpr(unsigned BuiltinID, const CallExpr *E);
1106 : llvm::Value *EmitPPCBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
1107 :
1108 : llvm::Value *EmitObjCProtocolExpr(const ObjCProtocolExpr *E);
1109 : llvm::Value *EmitObjCStringLiteral(const ObjCStringLiteral *E);
1110 : llvm::Value *EmitObjCSelectorExpr(const ObjCSelectorExpr *E);
1111 : RValue EmitObjCMessageExpr(const ObjCMessageExpr *E);
1112 : RValue EmitObjCPropertyGet(const Expr *E);
1113 : RValue EmitObjCSuperPropertyGet(const Expr *Exp, const Selector &S);
1114 : void EmitObjCPropertySet(const Expr *E, RValue Src);
1115 : void EmitObjCSuperPropertySet(const Expr *E, const Selector &S, RValue Src);
1116 :
1117 :
1118 : /// EmitReferenceBindingToExpr - Emits a reference binding to the passed in
1119 : /// expression. Will emit a temporary variable if E is not an LValue.
1120 : RValue EmitReferenceBindingToExpr(const Expr* E, bool IsInitializer = false);
1121 :
1122 : //===--------------------------------------------------------------------===//
1123 : // Expression Emission
1124 : //===--------------------------------------------------------------------===//
1125 :
1126 : // Expressions are broken into three classes: scalar, complex, aggregate.
1127 :
1128 : /// EmitScalarExpr - Emit the computation of the specified expression of LLVM
1129 : /// scalar type, returning the result.
1130 : llvm::Value *EmitScalarExpr(const Expr *E , bool IgnoreResultAssign = false);
1131 :
1132 : /// EmitScalarConversion - Emit a conversion from the specified type to the
1133 : /// specified destination type, both of which are LLVM scalar types.
1134 : llvm::Value *EmitScalarConversion(llvm::Value *Src, QualType SrcTy,
1135 : QualType DstTy);
1136 :
1137 : /// EmitComplexToScalarConversion - Emit a conversion from the specified
1138 : /// complex type to the specified destination type, where the destination type
1139 : /// is an LLVM scalar type.
1140 : llvm::Value *EmitComplexToScalarConversion(ComplexPairTy Src, QualType SrcTy,
1141 : QualType DstTy);
1142 :
1143 :
1144 : /// EmitAggExpr - Emit the computation of the specified expression of
1145 : /// aggregate type. The result is computed into DestPtr. Note that if
1146 : /// DestPtr is null, the value of the aggregate expression is not needed.
1147 : void EmitAggExpr(const Expr *E, llvm::Value *DestPtr, bool VolatileDest,
1148 : bool IgnoreResult = false, bool IsInitializer = false,
1149 : bool RequiresGCollection = false);
1150 :
1151 : /// EmitAggExprToLValue - Emit the computation of the specified expression of
1152 : /// aggregate type into a temporary LValue.
1153 : LValue EmitAggExprToLValue(const Expr *E);
1154 :
1155 : /// EmitGCMemmoveCollectable - Emit special API for structs with object
1156 : /// pointers.
1157 : void EmitGCMemmoveCollectable(llvm::Value *DestPtr, llvm::Value *SrcPtr,
1158 : QualType Ty);
1159 :
1160 : /// EmitComplexExpr - Emit the computation of the specified expression of
1161 : /// complex type, returning the result.
1162 : ComplexPairTy EmitComplexExpr(const Expr *E, bool IgnoreReal = false,
1163 : bool IgnoreImag = false,
1164 : bool IgnoreRealAssign = false,
1165 : bool IgnoreImagAssign = false);
1166 :
1167 : /// EmitComplexExprIntoAddr - Emit the computation of the specified expression
1168 : /// of complex type, storing into the specified Value*.
1169 : void EmitComplexExprIntoAddr(const Expr *E, llvm::Value *DestAddr,
1170 : bool DestIsVolatile);
1171 :
1172 : /// StoreComplexToAddr - Store a complex number into the specified address.
1173 : void StoreComplexToAddr(ComplexPairTy V, llvm::Value *DestAddr,
1174 : bool DestIsVolatile);
1175 : /// LoadComplexFromAddr - Load a complex number from the specified address.
1176 : ComplexPairTy LoadComplexFromAddr(llvm::Value *SrcAddr, bool SrcIsVolatile);
1177 :
1178 : /// CreateStaticBlockVarDecl - Create a zero-initialized LLVM global for a
1179 : /// static block var decl.
1180 : llvm::GlobalVariable *CreateStaticBlockVarDecl(const VarDecl &D,
1181 : const char *Separator,
1182 : llvm::GlobalValue::LinkageTypes Linkage);
1183 :
1184 : /// AddInitializerToGlobalBlockVarDecl - Add the initializer for 'D' to the
1185 : /// global variable that has already been created for it. If the initializer
1186 : /// has a different type than GV does, this may free GV and return a different
1187 : /// one. Otherwise it just returns GV.
1188 : llvm::GlobalVariable *
1189 : AddInitializerToGlobalBlockVarDecl(const VarDecl &D,
1190 : llvm::GlobalVariable *GV);
1191 :
1192 :
1193 : /// EmitStaticCXXBlockVarDeclInit - Create the initializer for a C++ runtime
1194 : /// initialized static block var decl.
1195 : void EmitStaticCXXBlockVarDeclInit(const VarDecl &D,
1196 : llvm::GlobalVariable *GV);
1197 :
1198 : /// EmitCXXGlobalVarDeclInit - Create the initializer for a C++
1199 : /// variable with global storage.
1200 : void EmitCXXGlobalVarDeclInit(const VarDecl &D, llvm::Constant *DeclPtr);
1201 :
1202 : /// EmitCXXGlobalDtorRegistration - Emits a call to register the global ptr
1203 : /// with the C++ runtime so that its destructor will be called at exit.
1204 : void EmitCXXGlobalDtorRegistration(llvm::Constant *DtorFn,
1205 : llvm::Constant *DeclPtr);
1206 :
1207 : /// GenerateCXXGlobalInitFunc - Generates code for initializing global
1208 : /// variables.
1209 : void GenerateCXXGlobalInitFunc(llvm::Function *Fn,
1210 : llvm::Constant **Decls,
1211 : unsigned NumDecls);
1212 :
1213 : void GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn, const VarDecl *D);
1214 :
1215 : void EmitCXXConstructExpr(llvm::Value *Dest, const CXXConstructExpr *E);
1216 :
1217 : RValue EmitCXXExprWithTemporaries(const CXXExprWithTemporaries *E,
1218 : llvm::Value *AggLoc = 0,
1219 : bool IsAggLocVolatile = false,
1220 : bool IsInitializer = false);
1221 :
1222 : void EmitCXXThrowExpr(const CXXThrowExpr *E);
1223 :
1224 : //===--------------------------------------------------------------------===//
1225 : // Internal Helpers
1226 : //===--------------------------------------------------------------------===//
1227 :
1228 : /// ContainsLabel - Return true if the statement contains a label in it. If
1229 : /// this statement is not executed normally, it not containing a label means
1230 : /// that we can just remove the code.
1231 : static bool ContainsLabel(const Stmt *S, bool IgnoreCaseStmts = false);
1232 :
1233 : /// ConstantFoldsToSimpleInteger - If the specified expression does not fold
1234 : /// to a constant, or if it does but contains a label, return 0. If it
1235 : /// constant folds to 'true' and does not contain a label, return 1, if it
1236 : /// constant folds to 'false' and does not contain a label, return -1.
1237 : int ConstantFoldsToSimpleInteger(const Expr *Cond);
1238 :
1239 : /// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an
1240 : /// if statement) to the specified blocks. Based on the condition, this might
1241 : /// try to simplify the codegen of the conditional based on the branch.
1242 : void EmitBranchOnBoolExpr(const Expr *Cond, llvm::BasicBlock *TrueBlock,
1243 : llvm::BasicBlock *FalseBlock);
1244 :
1245 : /// getTrapBB - Create a basic block that will call the trap intrinsic. We'll
1246 : /// generate a branch around the created basic block as necessary.
1247 : llvm::BasicBlock* getTrapBB();
1248 : private:
1249 :
1250 : void EmitReturnOfRValue(RValue RV, QualType Ty);
1251 :
1252 : /// ExpandTypeFromArgs - Reconstruct a structure of type \arg Ty
1253 : /// from function arguments into \arg Dst. See ABIArgInfo::Expand.
1254 : ///
1255 : /// \param AI - The first function argument of the expansion.
1256 : /// \return The argument following the last expanded function
1257 : /// argument.
1258 : llvm::Function::arg_iterator
1259 : ExpandTypeFromArgs(QualType Ty, LValue Dst,
1260 : llvm::Function::arg_iterator AI);
1261 :
1262 : /// ExpandTypeToArgs - Expand an RValue \arg Src, with the LLVM type for \arg
1263 : /// Ty, into individual arguments on the provided vector \arg Args. See
1264 : /// ABIArgInfo::Expand.
1265 : void ExpandTypeToArgs(QualType Ty, RValue Src,
1266 : llvm::SmallVector<llvm::Value*, 16> &Args);
1267 :
1268 : llvm::Value* EmitAsmInput(const AsmStmt &S,
1269 : const TargetInfo::ConstraintInfo &Info,
1270 : const Expr *InputExpr, std::string &ConstraintStr);
1271 :
1272 : /// EmitCleanupBlock - emits a single cleanup block.
1273 : void EmitCleanupBlock();
1274 :
1275 : /// AddBranchFixup - adds a branch instruction to the list of fixups for the
1276 : /// current cleanup scope.
1277 : void AddBranchFixup(llvm::BranchInst *BI);
1278 :
1279 : /// EmitCallArg - Emit a single call argument.
1280 : RValue EmitCallArg(const Expr *E, QualType ArgType);
1281 :
1282 : /// EmitCallArgs - Emit call arguments for a function.
1283 : /// The CallArgTypeInfo parameter is used for iterating over the known
1284 : /// argument types of the function being called.
1285 : template<typename T>
1286 : void EmitCallArgs(CallArgList& Args, const T* CallArgTypeInfo,
1287 : CallExpr::const_arg_iterator ArgBeg,
1288 2523: CallExpr::const_arg_iterator ArgEnd) {
1289 2523: CallExpr::const_arg_iterator Arg = ArgBeg;
1290 :
1291 : // First, use the argument types that the type info knows about
109: branch 1 taken
1292 2523: if (CallArgTypeInfo) {
1293 9704: for (typename T::arg_type_iterator I = CallArgTypeInfo->arg_type_begin(),
1294 2386: E = CallArgTypeInfo->arg_type_end(); I != E; ++I, ++Arg) {
1295 1344: assert(Arg != ArgEnd && "Running over edge of argument list!");
1296 1344: QualType ArgType = *I;
1297 :
1298 1344: assert(getContext().getCanonicalType(ArgType.getNonReferenceType()).
1299 : getTypePtr() ==
1300 : getContext().getCanonicalType(Arg->getType()).getTypePtr() &&
1301 : "type mismatch in call argument!");
1302 :
1303 1344: Args.push_back(std::make_pair(EmitCallArg(*Arg, ArgType),
1304 : ArgType));
1305 : }
1306 :
1307 : // Either we've emitted all the call args, or we have a call to a
1308 : // variadic function.
1309 2386: assert((Arg == ArgEnd || CallArgTypeInfo->isVariadic()) &&
1310 : "Extra arguments in non-variadic function!");
1311 :
1312 : }
1313 :
1314 : // If we still have any arguments, emit them using the type of the argument.
1315 3357: for (; Arg != ArgEnd; ++Arg) {
1316 834: QualType ArgType = Arg->getType();
1317 834: Args.push_back(std::make_pair(EmitCallArg(*Arg, ArgType),
1318 : ArgType));
1319 : }
1320 2523: }
1321 : };
1322 :
1323 :
1324 : } // end namespace CodeGen
1325 : } // end namespace clang
1326 :
1327 : #endif
Generated: 2010-02-10 01:31 by zcov