CodeGenFunction.h revision 7f28a9c37e67ae16396042ad9c085830969daf29
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 "llvm/ADT/DenseMap.h" 19#include "llvm/ADT/SmallVector.h" 20#include "clang/Basic/TargetInfo.h" 21#include "clang/AST/Expr.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/ExprObjC.h" 24 25#include <vector> 26#include <map> 27 28#include "CGBlocks.h" 29#include "CGBuilder.h" 30#include "CGCall.h" 31#include "CGValue.h" 32 33namespace llvm { 34 class BasicBlock; 35 class Module; 36 class SwitchInst; 37 class Value; 38} 39 40namespace clang { 41 class ASTContext; 42 class Decl; 43 class EnumConstantDecl; 44 class FunctionDecl; 45 class FunctionProtoType; 46 class LabelStmt; 47 class ObjCContainerDecl; 48 class ObjCInterfaceDecl; 49 class ObjCIvarDecl; 50 class ObjCMethodDecl; 51 class ObjCImplementationDecl; 52 class ObjCPropertyImplDecl; 53 class TargetInfo; 54 class VarDecl; 55 56namespace CodeGen { 57 class CodeGenModule; 58 class CodeGenTypes; 59 class CGDebugInfo; 60 class CGFunctionInfo; 61 class CGRecordLayout; 62 63/// CodeGenFunction - This class organizes the per-function state that is used 64/// while generating LLVM code. 65class CodeGenFunction : public BlockFunction { 66 CodeGenFunction(const CodeGenFunction&); // DO NOT IMPLEMENT 67 void operator=(const CodeGenFunction&); // DO NOT IMPLEMENT 68public: 69 CodeGenModule &CGM; // Per-module state. 70 TargetInfo &Target; 71 72 typedef std::pair<llvm::Value *, llvm::Value *> ComplexPairTy; 73 CGBuilderTy Builder; 74 75 // Holds the Decl for the current function or method 76 const Decl *CurFuncDecl; 77 const CGFunctionInfo *CurFnInfo; 78 QualType FnRetTy; 79 llvm::Function *CurFn; 80 81 /// ReturnBlock - Unified return block. 82 llvm::BasicBlock *ReturnBlock; 83 /// ReturnValue - The temporary alloca to hold the return value. This is null 84 /// iff the function has no return value. 85 llvm::Instruction *ReturnValue; 86 87 /// AllocaInsertPoint - This is an instruction in the entry block before which 88 /// we prefer to insert allocas. 89 llvm::Instruction *AllocaInsertPt; 90 91 const llvm::Type *LLVMIntTy; 92 uint32_t LLVMPointerWidth; 93 94public: 95 /// ObjCEHValueStack - Stack of Objective-C exception values, used for 96 /// rethrows. 97 llvm::SmallVector<llvm::Value*, 8> ObjCEHValueStack; 98 99 /// PushCleanupBlock - Push a new cleanup entry on the stack and set the 100 /// passed in block as the cleanup block. 101 void PushCleanupBlock(llvm::BasicBlock *CleanupBlock); 102 103 /// CleanupBlockInfo - A struct representing a popped cleanup block. 104 struct CleanupBlockInfo { 105 /// CleanupBlock - the cleanup block 106 llvm::BasicBlock *CleanupBlock; 107 108 /// SwitchBlock - the block (if any) containing the switch instruction used 109 /// for jumping to the final destination. 110 llvm::BasicBlock *SwitchBlock; 111 112 /// EndBlock - the default destination for the switch instruction. 113 llvm::BasicBlock *EndBlock; 114 115 CleanupBlockInfo(llvm::BasicBlock *cb, llvm::BasicBlock *sb, 116 llvm::BasicBlock *eb) 117 : CleanupBlock(cb), SwitchBlock(sb), EndBlock(eb) {} 118 }; 119 120 /// PopCleanupBlock - Will pop the cleanup entry on the stack, process all 121 /// branch fixups and return a block info struct with the switch block and end 122 /// block. 123 CleanupBlockInfo PopCleanupBlock(); 124 125 /// CleanupScope - RAII object that will create a cleanup block and set the 126 /// insert point to that block. When destructed, it sets the insert point to 127 /// the previous block and pushes a new cleanup entry on the stack. 128 class CleanupScope { 129 CodeGenFunction& CGF; 130 llvm::BasicBlock *CurBB; 131 llvm::BasicBlock *CleanupBB; 132 133 public: 134 CleanupScope(CodeGenFunction &cgf) 135 : CGF(cgf), CurBB(CGF.Builder.GetInsertBlock()) { 136 CleanupBB = CGF.createBasicBlock("cleanup"); 137 CGF.Builder.SetInsertPoint(CleanupBB); 138 } 139 140 ~CleanupScope() { 141 CGF.PushCleanupBlock(CleanupBB); 142 CGF.Builder.SetInsertPoint(CurBB); 143 } 144 }; 145 146 /// EmitCleanupBlocks - Takes the old cleanup stack size and emits the cleanup 147 /// blocks that have been added. 148 void EmitCleanupBlocks(size_t OldCleanupStackSize); 149 150 /// EmitBranchThroughCleanup - Emit a branch from the current insert block 151 /// through the cleanup handling code (if any) and then on to \arg Dest. 152 /// 153 /// FIXME: Maybe this should really be in EmitBranch? Don't we always want 154 /// this behavior for branches? 155 void EmitBranchThroughCleanup(llvm::BasicBlock *Dest); 156 157private: 158 CGDebugInfo* DebugInfo; 159 160 /// LabelIDs - Track arbitrary ids assigned to labels for use in implementing 161 /// the GCC address-of-label extension and indirect goto. IDs are assigned to 162 /// labels inside getIDForAddrOfLabel(). 163 std::map<const LabelStmt*, unsigned> LabelIDs; 164 165 /// IndirectSwitches - Record the list of switches for indirect 166 /// gotos. Emission of the actual switching code needs to be delayed until all 167 /// AddrLabelExprs have been seen. 168 std::vector<llvm::SwitchInst*> IndirectSwitches; 169 170 /// LocalDeclMap - This keeps track of the LLVM allocas or globals for local C 171 /// decls. 172 llvm::DenseMap<const Decl*, llvm::Value*> LocalDeclMap; 173 174 /// LabelMap - This keeps track of the LLVM basic block for each C label. 175 llvm::DenseMap<const LabelStmt*, llvm::BasicBlock*> LabelMap; 176 177 // BreakContinueStack - This keeps track of where break and continue 178 // statements should jump to. 179 struct BreakContinue { 180 BreakContinue(llvm::BasicBlock *bb, llvm::BasicBlock *cb) 181 : BreakBlock(bb), ContinueBlock(cb) {} 182 183 llvm::BasicBlock *BreakBlock; 184 llvm::BasicBlock *ContinueBlock; 185 }; 186 llvm::SmallVector<BreakContinue, 8> BreakContinueStack; 187 188 /// SwitchInsn - This is nearest current switch instruction. It is null if if 189 /// current context is not in a switch. 190 llvm::SwitchInst *SwitchInsn; 191 192 /// CaseRangeBlock - This block holds if condition check for last case 193 /// statement range in current switch instruction. 194 llvm::BasicBlock *CaseRangeBlock; 195 196 /// InvokeDest - This is the nearest exception target for calls 197 /// which can unwind, when exceptions are being used. 198 llvm::BasicBlock *InvokeDest; 199 200 // VLASizeMap - This keeps track of the associated size for each VLA type. 201 // FIXME: Maybe this could be a stack of maps that is pushed/popped as we 202 // enter/leave scopes. 203 llvm::DenseMap<const VariableArrayType*, llvm::Value*> VLASizeMap; 204 205 /// DidCallStackSave - Whether llvm.stacksave has been called. Used to avoid 206 /// calling llvm.stacksave for multiple VLAs in the same scope. 207 bool DidCallStackSave; 208 209 struct CleanupEntry { 210 /// CleanupBlock - The block of code that does the actual cleanup. 211 llvm::BasicBlock *CleanupBlock; 212 213 /// Blocks - Basic blocks that were emitted in the current cleanup scope. 214 std::vector<llvm::BasicBlock *> Blocks; 215 216 /// BranchFixups - Branch instructions to basic blocks that haven't been 217 /// inserted into the current function yet. 218 std::vector<llvm::BranchInst *> BranchFixups; 219 220 explicit CleanupEntry(llvm::BasicBlock *cb) 221 : CleanupBlock(cb) {} 222 223 ~CleanupEntry() { 224 assert(Blocks.empty() && "Did not empty blocks!"); 225 assert(BranchFixups.empty() && "Did not empty branch fixups!"); 226 } 227 }; 228 229 /// CleanupEntries - Stack of cleanup entries. 230 llvm::SmallVector<CleanupEntry, 8> CleanupEntries; 231 232 typedef llvm::DenseMap<llvm::BasicBlock*, size_t> BlockScopeMap; 233 234 /// BlockScopes - Map of which "cleanup scope" scope basic blocks have. 235 BlockScopeMap BlockScopes; 236 237public: 238 CodeGenFunction(CodeGenModule &cgm); 239 240 ASTContext &getContext() const; 241 CGDebugInfo *getDebugInfo() { return DebugInfo; } 242 243 llvm::BasicBlock *getInvokeDest() { return InvokeDest; } 244 void setInvokeDest(llvm::BasicBlock *B) { InvokeDest = B; } 245 246 //===--------------------------------------------------------------------===// 247 // Objective-C 248 //===--------------------------------------------------------------------===// 249 250 void GenerateObjCMethod(const ObjCMethodDecl *OMD); 251 252 void StartObjCMethod(const ObjCMethodDecl *MD, 253 const ObjCContainerDecl *CD); 254 255 /// GenerateObjCGetter - Synthesize an Objective-C property getter function. 256 void GenerateObjCGetter(ObjCImplementationDecl *IMP, 257 const ObjCPropertyImplDecl *PID); 258 259 /// GenerateObjCSetter - Synthesize an Objective-C property setter function 260 /// for the given property. 261 void GenerateObjCSetter(ObjCImplementationDecl *IMP, 262 const ObjCPropertyImplDecl *PID); 263 264 //===--------------------------------------------------------------------===// 265 // Block Bits 266 //===--------------------------------------------------------------------===// 267 268 llvm::Value *BuildBlockLiteralTmp(const BlockExpr *); 269 llvm::Constant *BuildDescriptorBlockDecl(uint64_t Size, 270 const llvm::StructType *, 271 std::vector<HelperInfo> *); 272 273 llvm::Function *GenerateBlockFunction(const BlockExpr *BExpr, 274 const BlockInfo& Info, 275 llvm::DenseMap<const Decl*, llvm::Value*> ldm, 276 uint64_t &Size, uint64_t &Align, 277 llvm::SmallVector<const Expr *, 8> &subBlockDeclRefDecls, 278 bool &subBlockHasCopyDispose); 279 280 llvm::Value *LoadBlockStruct(); 281 282 llvm::Value *GetAddrOfBlockDecl(const BlockDeclRefExpr *E); 283 284 const llvm::Type *BuildByRefType(QualType Ty, uint64_t Align); 285 286 void GenerateCode(const FunctionDecl *FD, 287 llvm::Function *Fn); 288 void StartFunction(const Decl *D, QualType RetTy, 289 llvm::Function *Fn, 290 const FunctionArgList &Args, 291 SourceLocation StartLoc); 292 293 /// EmitReturnBlock - Emit the unified return block, trying to avoid its 294 /// emission when possible. 295 void EmitReturnBlock(); 296 297 /// FinishFunction - Complete IR generation of the current function. It is 298 /// legal to call this function even if there is no current insertion point. 299 void FinishFunction(SourceLocation EndLoc=SourceLocation()); 300 301 /// EmitFunctionProlog - Emit the target specific LLVM code to load the 302 /// arguments for the given function. This is also responsible for naming the 303 /// LLVM function arguments. 304 void EmitFunctionProlog(const CGFunctionInfo &FI, 305 llvm::Function *Fn, 306 const FunctionArgList &Args); 307 308 /// EmitFunctionEpilog - Emit the target specific LLVM code to return the 309 /// given temporary. 310 void EmitFunctionEpilog(const CGFunctionInfo &FI, llvm::Value *ReturnValue); 311 312 const llvm::Type *ConvertTypeForMem(QualType T); 313 const llvm::Type *ConvertType(QualType T); 314 315 /// LoadObjCSelf - Load the value of self. This function is only valid while 316 /// generating code for an Objective-C method. 317 llvm::Value *LoadObjCSelf(); 318 319 /// TypeOfSelfObject - Return type of object that this self represents. 320 QualType TypeOfSelfObject(); 321 322 /// hasAggregateLLVMType - Return true if the specified AST type will map into 323 /// an aggregate LLVM type or is void. 324 static bool hasAggregateLLVMType(QualType T); 325 326 /// createBasicBlock - Create an LLVM basic block. 327 llvm::BasicBlock *createBasicBlock(const char *Name="", 328 llvm::Function *Parent=0, 329 llvm::BasicBlock *InsertBefore=0) { 330#ifdef NDEBUG 331 return llvm::BasicBlock::Create("", Parent, InsertBefore); 332#else 333 return llvm::BasicBlock::Create(Name, Parent, InsertBefore); 334#endif 335 } 336 337 /// getBasicBlockForLabel - Return the LLVM basicblock that the specified 338 /// label maps to. 339 llvm::BasicBlock *getBasicBlockForLabel(const LabelStmt *S); 340 341 /// EmitBlock - Emit the given block \arg BB and set it as the insert point, 342 /// adding a fall-through branch from the current insert block if 343 /// necessary. It is legal to call this function even if there is no current 344 /// insertion point. 345 /// 346 /// IsFinished - If true, indicates that the caller has finished emitting 347 /// branches to the given block and does not expect to emit code into it. This 348 /// means the block can be ignored if it is unreachable. 349 void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false); 350 351 /// EmitBranch - Emit a branch to the specified basic block from the current 352 /// insert block, taking care to avoid creation of branches from dummy 353 /// blocks. It is legal to call this function even if there is no current 354 /// insertion point. 355 /// 356 /// This function clears the current insertion point. The caller should follow 357 /// calls to this function with calls to Emit*Block prior to generation new 358 /// code. 359 void EmitBranch(llvm::BasicBlock *Block); 360 361 /// HaveInsertPoint - True if an insertion point is defined. If not, this 362 /// indicates that the current code being emitted is unreachable. 363 bool HaveInsertPoint() const { 364 return Builder.GetInsertBlock() != 0; 365 } 366 367 /// EnsureInsertPoint - Ensure that an insertion point is defined so that 368 /// emitted IR has a place to go. Note that by definition, if this function 369 /// creates a block then that block is unreachable; callers may do better to 370 /// detect when no insertion point is defined and simply skip IR generation. 371 void EnsureInsertPoint() { 372 if (!HaveInsertPoint()) 373 EmitBlock(createBasicBlock()); 374 } 375 376 /// ErrorUnsupported - Print out an error that codegen doesn't support the 377 /// specified stmt yet. 378 void ErrorUnsupported(const Stmt *S, const char *Type, 379 bool OmitOnError=false); 380 381 //===--------------------------------------------------------------------===// 382 // Helpers 383 //===--------------------------------------------------------------------===// 384 385 /// CreateTempAlloca - This creates a alloca and inserts it into the entry 386 /// block. 387 llvm::AllocaInst *CreateTempAlloca(const llvm::Type *Ty, 388 const char *Name = "tmp"); 389 390 /// EvaluateExprAsBool - Perform the usual unary conversions on the specified 391 /// expression and compare the result against zero, returning an Int1Ty value. 392 llvm::Value *EvaluateExprAsBool(const Expr *E); 393 394 /// EmitAnyExpr - Emit code to compute the specified expression which can have 395 /// any type. The result is returned as an RValue struct. If this is an 396 /// aggregate expression, the aggloc/agglocvolatile arguments indicate where 397 /// the result should be returned. 398 RValue EmitAnyExpr(const Expr *E, llvm::Value *AggLoc = 0, 399 bool isAggLocVolatile = false); 400 401 // EmitVAListRef - Emit a "reference" to a va_list; this is either the address 402 // or the value of the expression, depending on how va_list is defined. 403 llvm::Value *EmitVAListRef(const Expr *E); 404 405 /// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result will 406 /// always be accessible even if no aggregate location is provided. 407 RValue EmitAnyExprToTemp(const Expr *E, llvm::Value *AggLoc = 0, 408 bool isAggLocVolatile = false); 409 410 void EmitAggregateCopy(llvm::Value *DestPtr, llvm::Value *SrcPtr, 411 QualType EltTy); 412 413 void EmitAggregateClear(llvm::Value *DestPtr, QualType Ty); 414 415 /// StartBlock - Start new block named N. If insert block is a dummy block 416 /// then reuse it. 417 void StartBlock(const char *N); 418 419 /// getCGRecordLayout - Return record layout info. 420 const CGRecordLayout *getCGRecordLayout(CodeGenTypes &CGT, QualType RTy); 421 422 /// GetAddrOfStaticLocalVar - Return the address of a static local variable. 423 llvm::Constant *GetAddrOfStaticLocalVar(const VarDecl *BVD); 424 425 /// GetAddrOfLocalVar - Return the address of a local variable. 426 llvm::Value *GetAddrOfLocalVar(const VarDecl *VD); 427 428 /// getAccessedFieldNo - Given an encoded value and a result number, return 429 /// the input field number being accessed. 430 static unsigned getAccessedFieldNo(unsigned Idx, const llvm::Constant *Elts); 431 432 unsigned GetIDForAddrOfLabel(const LabelStmt *L); 433 434 /// EmitMemSetToZero - Generate code to memset a value of the given type to 0. 435 void EmitMemSetToZero(llvm::Value *DestPtr, QualType Ty); 436 437 // EmitVAArg - Generate code to get an argument from the passed in pointer 438 // and update it accordingly. The return value is a pointer to the argument. 439 // FIXME: We should be able to get rid of this method and use the va_arg 440 // instruction in LLVM instead once it works well enough. 441 llvm::Value *EmitVAArg(llvm::Value *VAListAddr, QualType Ty); 442 443 // EmitVLASize - Generate code for any VLA size expressions that might occur 444 // in a variably modified type. If Ty is a VLA, will return the value that 445 // corresponds to the size in bytes of the VLA type. Will return 0 otherwise. 446 llvm::Value *EmitVLASize(QualType Ty); 447 448 // GetVLASize - Returns an LLVM value that corresponds to the size in bytes 449 // of a variable length array type. 450 llvm::Value *GetVLASize(const VariableArrayType *); 451 452 //===--------------------------------------------------------------------===// 453 // Declaration Emission 454 //===--------------------------------------------------------------------===// 455 456 void EmitDecl(const Decl &D); 457 void EmitBlockVarDecl(const VarDecl &D); 458 void EmitLocalBlockVarDecl(const VarDecl &D); 459 void EmitStaticBlockVarDecl(const VarDecl &D); 460 461 /// EmitParmDecl - Emit a ParmVarDecl or an ImplicitParamDecl. 462 void EmitParmDecl(const VarDecl &D, llvm::Value *Arg); 463 464 //===--------------------------------------------------------------------===// 465 // Statement Emission 466 //===--------------------------------------------------------------------===// 467 468 /// EmitStopPoint - Emit a debug stoppoint if we are emitting debug info. 469 void EmitStopPoint(const Stmt *S); 470 471 /// EmitStmt - Emit the code for the statement \arg S. It is legal to call 472 /// this function even if there is no current insertion point. 473 /// 474 /// This function may clear the current insertion point; callers should use 475 /// EnsureInsertPoint if they wish to subsequently generate code without first 476 /// calling EmitBlock, EmitBranch, or EmitStmt. 477 void EmitStmt(const Stmt *S); 478 479 /// EmitSimpleStmt - Try to emit a "simple" statement which does not 480 /// necessarily require an insertion point or debug information; typically 481 /// because the statement amounts to a jump or a container of other 482 /// statements. 483 /// 484 /// \return True if the statement was handled. 485 bool EmitSimpleStmt(const Stmt *S); 486 487 RValue EmitCompoundStmt(const CompoundStmt &S, bool GetLast = false, 488 llvm::Value *AggLoc = 0, bool isAggVol = false); 489 490 /// EmitLabel - Emit the block for the given label. It is legal to call this 491 /// function even if there is no current insertion point. 492 void EmitLabel(const LabelStmt &S); // helper for EmitLabelStmt. 493 494 void EmitLabelStmt(const LabelStmt &S); 495 void EmitGotoStmt(const GotoStmt &S); 496 void EmitIndirectGotoStmt(const IndirectGotoStmt &S); 497 void EmitIfStmt(const IfStmt &S); 498 void EmitWhileStmt(const WhileStmt &S); 499 void EmitDoStmt(const DoStmt &S); 500 void EmitForStmt(const ForStmt &S); 501 void EmitReturnStmt(const ReturnStmt &S); 502 void EmitDeclStmt(const DeclStmt &S); 503 void EmitBreakStmt(const BreakStmt &S); 504 void EmitContinueStmt(const ContinueStmt &S); 505 void EmitSwitchStmt(const SwitchStmt &S); 506 void EmitDefaultStmt(const DefaultStmt &S); 507 void EmitCaseStmt(const CaseStmt &S); 508 void EmitCaseStmtRange(const CaseStmt &S); 509 void EmitAsmStmt(const AsmStmt &S); 510 511 void EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S); 512 void EmitObjCAtTryStmt(const ObjCAtTryStmt &S); 513 void EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S); 514 void EmitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt &S); 515 516 //===--------------------------------------------------------------------===// 517 // LValue Expression Emission 518 //===--------------------------------------------------------------------===// 519 520 /// GetUndefRValue - Get an appropriate 'undef' rvalue for the given type. 521 RValue GetUndefRValue(QualType Ty); 522 523 /// EmitUnsupportedRValue - Emit a dummy r-value using the type of E 524 /// and issue an ErrorUnsupported style diagnostic (using the 525 /// provided Name). 526 RValue EmitUnsupportedRValue(const Expr *E, 527 const char *Name); 528 529 /// EmitUnsupportedLValue - Emit a dummy l-value using the type of E and issue 530 /// an ErrorUnsupported style diagnostic (using the provided Name). 531 LValue EmitUnsupportedLValue(const Expr *E, 532 const char *Name); 533 534 /// EmitLValue - Emit code to compute a designator that specifies the location 535 /// of the expression. 536 /// 537 /// This can return one of two things: a simple address or a bitfield 538 /// reference. In either case, the LLVM Value* in the LValue structure is 539 /// guaranteed to be an LLVM pointer type. 540 /// 541 /// If this returns a bitfield reference, nothing about the pointee type of 542 /// the LLVM value is known: For example, it may not be a pointer to an 543 /// integer. 544 /// 545 /// If this returns a normal address, and if the lvalue's C type is fixed 546 /// size, this method guarantees that the returned pointer type will point to 547 /// an LLVM type of the same size of the lvalue's type. If the lvalue has a 548 /// variable length type, this is not possible. 549 /// 550 LValue EmitLValue(const Expr *E); 551 552 /// EmitLoadOfScalar - Load a scalar value from an address, taking 553 /// care to appropriately convert from the memory representation to 554 /// the LLVM value representation. 555 llvm::Value *EmitLoadOfScalar(llvm::Value *Addr, bool Volatile, 556 QualType Ty); 557 558 /// EmitStoreOfScalar - Store a scalar value to an address, taking 559 /// care to appropriately convert from the memory representation to 560 /// the LLVM value representation. 561 void EmitStoreOfScalar(llvm::Value *Value, llvm::Value *Addr, 562 bool Volatile); 563 564 /// EmitLoadOfLValue - Given an expression that represents a value lvalue, 565 /// this method emits the address of the lvalue, then loads the result as an 566 /// rvalue, returning the rvalue. 567 RValue EmitLoadOfLValue(LValue V, QualType LVType); 568 RValue EmitLoadOfExtVectorElementLValue(LValue V, QualType LVType); 569 RValue EmitLoadOfBitfieldLValue(LValue LV, QualType ExprType); 570 RValue EmitLoadOfPropertyRefLValue(LValue LV, QualType ExprType); 571 RValue EmitLoadOfKVCRefLValue(LValue LV, QualType ExprType); 572 573 574 /// EmitStoreThroughLValue - Store the specified rvalue into the specified 575 /// lvalue, where both are guaranteed to the have the same type, and that type 576 /// is 'Ty'. 577 void EmitStoreThroughLValue(RValue Src, LValue Dst, QualType Ty); 578 void EmitStoreThroughExtVectorComponentLValue(RValue Src, LValue Dst, 579 QualType Ty); 580 void EmitStoreThroughPropertyRefLValue(RValue Src, LValue Dst, QualType Ty); 581 void EmitStoreThroughKVCRefLValue(RValue Src, LValue Dst, QualType Ty); 582 583 /// EmitStoreThroughLValue - Store Src into Dst with same constraints as 584 /// EmitStoreThroughLValue. 585 /// 586 /// \param Result [out] - If non-null, this will be set to a Value* for the 587 /// bit-field contents after the store, appropriate for use as the result of 588 /// an assignment to the bit-field. 589 void EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst, QualType Ty, 590 llvm::Value **Result=0); 591 592 // Note: only availabe for agg return types 593 LValue EmitBinaryOperatorLValue(const BinaryOperator *E); 594 // Note: only available for agg return types 595 LValue EmitCallExprLValue(const CallExpr *E); 596 // Note: only available for agg return types 597 LValue EmitVAArgExprLValue(const VAArgExpr *E); 598 LValue EmitDeclRefLValue(const DeclRefExpr *E); 599 LValue EmitStringLiteralLValue(const StringLiteral *E); 600 LValue EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E); 601 LValue EmitPredefinedFunctionName(unsigned Type); 602 LValue EmitPredefinedLValue(const PredefinedExpr *E); 603 LValue EmitUnaryOpLValue(const UnaryOperator *E); 604 LValue EmitArraySubscriptExpr(const ArraySubscriptExpr *E); 605 LValue EmitExtVectorElementExpr(const ExtVectorElementExpr *E); 606 LValue EmitMemberExpr(const MemberExpr *E); 607 LValue EmitCompoundLiteralLValue(const CompoundLiteralExpr *E); 608 609 llvm::Value *EmitIvarOffset(ObjCInterfaceDecl *Interface, 610 const ObjCIvarDecl *Ivar); 611 LValue EmitLValueForField(llvm::Value* Base, FieldDecl* Field, 612 bool isUnion, unsigned CVRQualifiers); 613 LValue EmitLValueForIvar(QualType ObjectTy, 614 llvm::Value* Base, const ObjCIvarDecl *Ivar, 615 const FieldDecl *Field, 616 unsigned CVRQualifiers); 617 618 LValue EmitLValueForBitfield(llvm::Value* Base, FieldDecl* Field, 619 unsigned CVRQualifiers); 620 621 LValue EmitBlockDeclRefLValue(const BlockDeclRefExpr *E); 622 623 LValue EmitCXXConditionDeclLValue(const CXXConditionDeclExpr *E); 624 625 LValue EmitObjCMessageExprLValue(const ObjCMessageExpr *E); 626 LValue EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E); 627 LValue EmitObjCPropertyRefLValue(const ObjCPropertyRefExpr *E); 628 LValue EmitObjCKVCRefLValue(const ObjCKVCRefExpr *E); 629 LValue EmitObjCSuperExpr(const ObjCSuperExpr *E); 630 631 //===--------------------------------------------------------------------===// 632 // Scalar Expression Emission 633 //===--------------------------------------------------------------------===// 634 635 /// EmitCall - Generate a call of the given function, expecting the given 636 /// result type, and using the given argument list which specifies both the 637 /// LLVM arguments and the types they were derived from. 638 /// 639 /// \param TargetDecl - If given, the decl of the function in a 640 /// direct call; used to set attributes on the call (noreturn, 641 /// etc.). 642 RValue EmitCall(const CGFunctionInfo &FnInfo, 643 llvm::Value *Callee, 644 const CallArgList &Args, 645 const Decl *TargetDecl = 0); 646 647 RValue EmitCallExpr(const CallExpr *E); 648 649 RValue EmitCallExpr(llvm::Value *Callee, QualType FnType, 650 CallExpr::const_arg_iterator ArgBeg, 651 CallExpr::const_arg_iterator ArgEnd, 652 const Decl *TargetDecl = 0); 653 654 RValue EmitBuiltinExpr(const FunctionDecl *FD, 655 unsigned BuiltinID, const CallExpr *E); 656 657 RValue EmitBlockCallExpr(const CallExpr *E); 658 659 /// EmitTargetBuiltinExpr - Emit the given builtin call. Returns 0 if the call 660 /// is unhandled by the current target. 661 llvm::Value *EmitTargetBuiltinExpr(unsigned BuiltinID, const CallExpr *E); 662 663 llvm::Value *EmitX86BuiltinExpr(unsigned BuiltinID, const CallExpr *E); 664 llvm::Value *EmitPPCBuiltinExpr(unsigned BuiltinID, const CallExpr *E); 665 666 llvm::Value *EmitShuffleVector(llvm::Value* V1, llvm::Value *V2, ...); 667 llvm::Value *EmitVector(llvm::Value * const *Vals, unsigned NumVals, 668 bool isSplat = false); 669 670 llvm::Value *EmitObjCProtocolExpr(const ObjCProtocolExpr *E); 671 llvm::Value *EmitObjCStringLiteral(const ObjCStringLiteral *E); 672 llvm::Value *EmitObjCSelectorExpr(const ObjCSelectorExpr *E); 673 RValue EmitObjCMessageExpr(const ObjCMessageExpr *E); 674 RValue EmitObjCPropertyGet(const Expr *E); 675 void EmitObjCPropertySet(const Expr *E, RValue Src); 676 677 678 //===--------------------------------------------------------------------===// 679 // Expression Emission 680 //===--------------------------------------------------------------------===// 681 682 // Expressions are broken into three classes: scalar, complex, aggregate. 683 684 /// EmitScalarExpr - Emit the computation of the specified expression of LLVM 685 /// scalar type, returning the result. 686 llvm::Value *EmitScalarExpr(const Expr *E); 687 688 /// EmitScalarConversion - Emit a conversion from the specified type to the 689 /// specified destination type, both of which are LLVM scalar types. 690 llvm::Value *EmitScalarConversion(llvm::Value *Src, QualType SrcTy, 691 QualType DstTy); 692 693 /// EmitComplexToScalarConversion - Emit a conversion from the specified 694 /// complex type to the specified destination type, where the destination type 695 /// is an LLVM scalar type. 696 llvm::Value *EmitComplexToScalarConversion(ComplexPairTy Src, QualType SrcTy, 697 QualType DstTy); 698 699 700 /// EmitAggExpr - Emit the computation of the specified expression of 701 /// aggregate type. The result is computed into DestPtr. Note that if 702 /// DestPtr is null, the value of the aggregate expression is not needed. 703 void EmitAggExpr(const Expr *E, llvm::Value *DestPtr, bool VolatileDest); 704 705 /// EmitComplexExpr - Emit the computation of the specified expression of 706 /// complex type, returning the result. 707 ComplexPairTy EmitComplexExpr(const Expr *E); 708 709 /// EmitComplexExprIntoAddr - Emit the computation of the specified expression 710 /// of complex type, storing into the specified Value*. 711 void EmitComplexExprIntoAddr(const Expr *E, llvm::Value *DestAddr, 712 bool DestIsVolatile); 713 714 /// StoreComplexToAddr - Store a complex number into the specified address. 715 void StoreComplexToAddr(ComplexPairTy V, llvm::Value *DestAddr, 716 bool DestIsVolatile); 717 /// LoadComplexFromAddr - Load a complex number from the specified address. 718 ComplexPairTy LoadComplexFromAddr(llvm::Value *SrcAddr, bool SrcIsVolatile); 719 720 /// CreateStaticBlockVarDecl - Create a zero-initialized LLVM global 721 /// for a static block var decl. 722 llvm::GlobalVariable * CreateStaticBlockVarDecl(const VarDecl &D, 723 const char *Separator, 724 llvm::GlobalValue::LinkageTypes 725 Linkage); 726 727 /// GenerateStaticCXXBlockVarDecl - Create the initializer for a C++ 728 /// runtime initialized static block var decl. 729 void GenerateStaticCXXBlockVarDeclInit(const VarDecl &D, 730 llvm::GlobalVariable *GV); 731 732 //===--------------------------------------------------------------------===// 733 // Internal Helpers 734 //===--------------------------------------------------------------------===// 735 736 /// ContainsLabel - Return true if the statement contains a label in it. If 737 /// this statement is not executed normally, it not containing a label means 738 /// that we can just remove the code. 739 static bool ContainsLabel(const Stmt *S, bool IgnoreCaseStmts = false); 740 741 /// ConstantFoldsToSimpleInteger - If the specified expression does not fold 742 /// to a constant, or if it does but contains a label, return 0. If it 743 /// constant folds to 'true' and does not contain a label, return 1, if it 744 /// constant folds to 'false' and does not contain a label, return -1. 745 int ConstantFoldsToSimpleInteger(const Expr *Cond); 746 747 /// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an 748 /// if statement) to the specified blocks. Based on the condition, this might 749 /// try to simplify the codegen of the conditional based on the branch. 750 void EmitBranchOnBoolExpr(const Expr *Cond, llvm::BasicBlock *TrueBlock, 751 llvm::BasicBlock *FalseBlock); 752private: 753 754 /// EmitIndirectSwitches - Emit code for all of the switch 755 /// instructions in IndirectSwitches. 756 void EmitIndirectSwitches(); 757 758 void EmitReturnOfRValue(RValue RV, QualType Ty); 759 760 /// ExpandTypeFromArgs - Reconstruct a structure of type \arg Ty 761 /// from function arguments into \arg Dst. See ABIArgInfo::Expand. 762 /// 763 /// \param AI - The first function argument of the expansion. 764 /// \return The argument following the last expanded function 765 /// argument. 766 llvm::Function::arg_iterator 767 ExpandTypeFromArgs(QualType Ty, LValue Dst, 768 llvm::Function::arg_iterator AI); 769 770 /// ExpandTypeToArgs - Expand an RValue \arg Src, with the LLVM type for \arg 771 /// Ty, into individual arguments on the provided vector \arg Args. See 772 /// ABIArgInfo::Expand. 773 void ExpandTypeToArgs(QualType Ty, RValue Src, 774 llvm::SmallVector<llvm::Value*, 16> &Args); 775 776 llvm::Value* EmitAsmInput(const AsmStmt &S, TargetInfo::ConstraintInfo Info, 777 const Expr *InputExpr, std::string &ConstraintStr); 778 779 /// EmitCleanupBlock - emits a single cleanup block. 780 void EmitCleanupBlock(); 781 782 /// AddBranchFixup - adds a branch instruction to the list of fixups for the 783 /// current cleanup scope. 784 void AddBranchFixup(llvm::BranchInst *BI); 785 786}; 787} // end namespace CodeGen 788} // end namespace clang 789 790#endif 791