1 //===- CallSite.h - Abstract Call & Invoke instrs ---------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the CallSite class, which is a handy wrapper for code that
11 // wants to treat Call and Invoke instructions in a generic way. When in non-
12 // mutation context (e.g. an analysis) ImmutableCallSite should be used.
13 // Finally, when some degree of customization is necessary between these two
14 // extremes, CallSiteBase<> can be supplied with fine-tuned parameters.
16 // NOTE: These classes are supposed to have "value semantics". So they should be
17 // passed by value, not by reference; they should not be "new"ed or "delete"d.
18 // They are efficiently copyable, assignable and constructable, with cost
19 // equivalent to copying a pointer (notice that they have only a single data
20 // member). The internal representation carries a flag which indicates which of
21 // the two variants is enclosed. This allows for cheaper checks when various
22 // accessors of CallSite are employed.
24 //===----------------------------------------------------------------------===//
26 #ifndef LLVM_IR_CALLSITE_H
27 #define LLVM_IR_CALLSITE_H
29 #include "llvm/ADT/PointerIntPair.h"
30 #include "llvm/ADT/iterator_range.h"
31 #include "llvm/IR/Attributes.h"
32 #include "llvm/IR/CallingConv.h"
33 #include "llvm/IR/Instructions.h"
40 template <typename FunTy = const Function,
41 typename BBTy = const BasicBlock,
42 typename ValTy = const Value,
43 typename UserTy = const User,
44 typename UseTy = const Use,
45 typename InstrTy = const Instruction,
46 typename CallTy = const CallInst,
47 typename InvokeTy = const InvokeInst,
48 typename IterTy = User::const_op_iterator>
51 PointerIntPair<InstrTy*, 1, bool> I;
53 CallSiteBase() : I(nullptr, false) {}
54 CallSiteBase(CallTy *CI) : I(CI, true) { assert(CI); }
55 CallSiteBase(InvokeTy *II) : I(II, false) { assert(II); }
56 explicit CallSiteBase(ValTy *II) { *this = get(II); }
59 /// CallSiteBase::get - This static method is sort of like a constructor. It
60 /// will create an appropriate call site for a Call or Invoke instruction, but
61 /// it can also create a null initialized CallSiteBase object for something
62 /// which is NOT a call site.
64 static CallSiteBase get(ValTy *V) {
65 if (InstrTy *II = dyn_cast<InstrTy>(V)) {
66 if (II->getOpcode() == Instruction::Call)
67 return CallSiteBase(static_cast<CallTy*>(II));
68 else if (II->getOpcode() == Instruction::Invoke)
69 return CallSiteBase(static_cast<InvokeTy*>(II));
71 return CallSiteBase();
75 /// isCall - true if a CallInst is enclosed.
76 /// Note that !isCall() does not mean it is an InvokeInst enclosed,
77 /// it also could signify a NULL Instruction pointer.
78 bool isCall() const { return I.getInt(); }
80 /// isInvoke - true if a InvokeInst is enclosed.
82 bool isInvoke() const { return getInstruction() && !I.getInt(); }
84 InstrTy *getInstruction() const { return I.getPointer(); }
85 InstrTy *operator->() const { return I.getPointer(); }
86 explicit operator bool() const { return I.getPointer(); }
88 /// Get the basic block containing the call site
89 BBTy* getParent() const { return getInstruction()->getParent(); }
91 /// getCalledValue - Return the pointer to function that is being called.
93 ValTy *getCalledValue() const {
94 assert(getInstruction() && "Not a call or invoke instruction!");
98 /// getCalledFunction - Return the function being called if this is a direct
99 /// call, otherwise return null (if it's an indirect call).
101 FunTy *getCalledFunction() const {
102 return dyn_cast<FunTy>(getCalledValue());
105 /// setCalledFunction - Set the callee to the specified value.
107 void setCalledFunction(Value *V) {
108 assert(getInstruction() && "Not a call or invoke instruction!");
112 /// isCallee - Determine whether the passed iterator points to the
113 /// callee operand's Use.
114 bool isCallee(Value::const_user_iterator UI) const {
115 return isCallee(&UI.getUse());
118 /// Determine whether this Use is the callee operand's Use.
119 bool isCallee(const Use *U) const { return getCallee() == U; }
121 /// \brief Determine whether the passed iterator points to an argument
123 bool isArgOperand(Value::const_user_iterator UI) const {
124 return isArgOperand(&UI.getUse());
127 /// \brief Determine whether the passed use points to an argument operand.
128 bool isArgOperand(const Use *U) const {
129 return arg_begin() <= U && U < arg_end();
132 /// \brief Determine whether the passed iterator points to a bundle operand.
133 bool isBundleOperand(Value::const_user_iterator UI) const {
134 return isBundleOperand(&UI.getUse());
137 /// \brief Determine whether the passed use points to a bundle operand.
138 bool isBundleOperand(const Use *U) const {
139 if (!hasOperandBundles())
141 unsigned OperandNo = U->getOperandNo();
142 return getBundleOperandsStartIndex() <= OperandNo &&
143 OperandNo < getBundleOperandsEndIndex();
146 ValTy *getArgument(unsigned ArgNo) const {
147 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
148 return *(arg_begin() + ArgNo);
151 void setArgument(unsigned ArgNo, Value* newVal) {
152 assert(getInstruction() && "Not a call or invoke instruction!");
153 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
154 getInstruction()->setOperand(ArgNo, newVal);
157 /// Given a value use iterator, returns the argument that corresponds to it.
158 /// Iterator must actually correspond to an argument.
159 unsigned getArgumentNo(Value::const_user_iterator I) const {
160 return getArgumentNo(&I.getUse());
163 /// Given a use for an argument, get the argument number that corresponds to
165 unsigned getArgumentNo(const Use *U) const {
166 assert(getInstruction() && "Not a call or invoke instruction!");
167 assert(isArgOperand(U) && "Argument # out of range!");
168 return U - arg_begin();
171 /// arg_iterator - The type of iterator to use when looping over actual
172 /// arguments at this call site.
173 typedef IterTy arg_iterator;
175 iterator_range<IterTy> args() const {
176 return make_range(arg_begin(), arg_end());
178 bool arg_empty() const { return arg_end() == arg_begin(); }
179 unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); }
181 /// Type of iterator to use when looping over data operands at this call site
183 typedef IterTy data_operand_iterator;
185 /// data_operands_begin/data_operands_end - Return iterators iterating over
186 /// the call / invoke argument list and bundle operands. For invokes, this is
187 /// the set of instruction operands except the invoke target and the two
188 /// successor blocks; and for calls this is the set of instruction operands
189 /// except the call target.
191 IterTy data_operands_begin() const {
192 assert(getInstruction() && "Not a call or invoke instruction!");
193 return (*this)->op_begin();
195 IterTy data_operands_end() const {
196 assert(getInstruction() && "Not a call or invoke instruction!");
197 return (*this)->op_end() - (isCall() ? 1 : 3);
199 iterator_range<IterTy> data_ops() const {
200 return make_range(data_operands_begin(), data_operands_end());
202 bool data_operands_empty() const {
203 return data_operands_end() == data_operands_begin();
205 unsigned data_operands_size() const {
206 return std::distance(data_operands_begin(), data_operands_end());
209 /// getType - Return the type of the instruction that generated this call site
211 Type *getType() const { return (*this)->getType(); }
213 /// getCaller - Return the caller function for this call site
215 FunTy *getCaller() const { return (*this)->getParent()->getParent(); }
217 /// \brief Tests if this call site must be tail call optimized. Only a
218 /// CallInst can be tail call optimized.
219 bool isMustTailCall() const {
220 return isCall() && cast<CallInst>(getInstruction())->isMustTailCall();
223 /// \brief Tests if this call site is marked as a tail call.
224 bool isTailCall() const {
225 return isCall() && cast<CallInst>(getInstruction())->isTailCall();
228 #define CALLSITE_DELEGATE_GETTER(METHOD) \
229 InstrTy *II = getInstruction(); \
231 ? cast<CallInst>(II)->METHOD \
232 : cast<InvokeInst>(II)->METHOD
234 #define CALLSITE_DELEGATE_SETTER(METHOD) \
235 InstrTy *II = getInstruction(); \
237 cast<CallInst>(II)->METHOD; \
239 cast<InvokeInst>(II)->METHOD
241 unsigned getNumArgOperands() const {
242 CALLSITE_DELEGATE_GETTER(getNumArgOperands());
245 ValTy *getArgOperand(unsigned i) const {
246 CALLSITE_DELEGATE_GETTER(getArgOperand(i));
249 bool isInlineAsm() const {
251 return cast<CallInst>(getInstruction())->isInlineAsm();
255 /// getCallingConv/setCallingConv - get or set the calling convention of the
257 CallingConv::ID getCallingConv() const {
258 CALLSITE_DELEGATE_GETTER(getCallingConv());
260 void setCallingConv(CallingConv::ID CC) {
261 CALLSITE_DELEGATE_SETTER(setCallingConv(CC));
264 FunctionType *getFunctionType() const {
265 CALLSITE_DELEGATE_GETTER(getFunctionType());
268 void mutateFunctionType(FunctionType *Ty) const {
269 CALLSITE_DELEGATE_SETTER(mutateFunctionType(Ty));
272 /// getAttributes/setAttributes - get or set the parameter attributes of
274 const AttributeSet &getAttributes() const {
275 CALLSITE_DELEGATE_GETTER(getAttributes());
277 void setAttributes(const AttributeSet &PAL) {
278 CALLSITE_DELEGATE_SETTER(setAttributes(PAL));
281 /// \brief Return true if this function has the given attribute.
282 bool hasFnAttr(Attribute::AttrKind A) const {
283 CALLSITE_DELEGATE_GETTER(hasFnAttr(A));
286 /// \brief Return true if the call or the callee has the given attribute.
287 bool paramHasAttr(unsigned i, Attribute::AttrKind A) const {
288 CALLSITE_DELEGATE_GETTER(paramHasAttr(i, A));
291 /// \brief Return true if the data operand at index \p i directly or
292 /// indirectly has the attribute \p A.
294 /// Normal call or invoke arguments have per operand attributes, as specified
295 /// in the attribute set attached to this instruction, while operand bundle
296 /// operands may have some attributes implied by the type of its containing
298 bool dataOperandHasImpliedAttr(unsigned i, Attribute::AttrKind A) const {
299 CALLSITE_DELEGATE_GETTER(dataOperandHasImpliedAttr(i, A));
302 /// @brief Extract the alignment for a call or parameter (0=unknown).
303 uint16_t getParamAlignment(uint16_t i) const {
304 CALLSITE_DELEGATE_GETTER(getParamAlignment(i));
307 /// @brief Extract the number of dereferenceable bytes for a call or
308 /// parameter (0=unknown).
309 uint64_t getDereferenceableBytes(uint16_t i) const {
310 CALLSITE_DELEGATE_GETTER(getDereferenceableBytes(i));
313 /// @brief Extract the number of dereferenceable_or_null bytes for a call or
314 /// parameter (0=unknown).
315 uint64_t getDereferenceableOrNullBytes(uint16_t i) const {
316 CALLSITE_DELEGATE_GETTER(getDereferenceableOrNullBytes(i));
319 /// @brief Determine if the parameter or return value is marked with NoAlias
321 /// @param n The parameter to check. 1 is the first parameter, 0 is the return
322 bool doesNotAlias(unsigned n) const {
323 CALLSITE_DELEGATE_GETTER(doesNotAlias(n));
326 /// \brief Return true if the call should not be treated as a call to a
328 bool isNoBuiltin() const {
329 CALLSITE_DELEGATE_GETTER(isNoBuiltin());
332 /// @brief Return true if the call should not be inlined.
333 bool isNoInline() const {
334 CALLSITE_DELEGATE_GETTER(isNoInline());
336 void setIsNoInline(bool Value = true) {
337 CALLSITE_DELEGATE_SETTER(setIsNoInline(Value));
340 /// @brief Determine if the call does not access memory.
341 bool doesNotAccessMemory() const {
342 CALLSITE_DELEGATE_GETTER(doesNotAccessMemory());
344 void setDoesNotAccessMemory() {
345 CALLSITE_DELEGATE_SETTER(setDoesNotAccessMemory());
348 /// @brief Determine if the call does not access or only reads memory.
349 bool onlyReadsMemory() const {
350 CALLSITE_DELEGATE_GETTER(onlyReadsMemory());
352 void setOnlyReadsMemory() {
353 CALLSITE_DELEGATE_SETTER(setOnlyReadsMemory());
356 /// @brief Determine if the call can access memmory only using pointers based
357 /// on its arguments.
358 bool onlyAccessesArgMemory() const {
359 CALLSITE_DELEGATE_GETTER(onlyAccessesArgMemory());
361 void setOnlyAccessesArgMemory() {
362 CALLSITE_DELEGATE_SETTER(setOnlyAccessesArgMemory());
365 /// @brief Determine if the call cannot return.
366 bool doesNotReturn() const {
367 CALLSITE_DELEGATE_GETTER(doesNotReturn());
369 void setDoesNotReturn() {
370 CALLSITE_DELEGATE_SETTER(setDoesNotReturn());
373 /// @brief Determine if the call cannot unwind.
374 bool doesNotThrow() const {
375 CALLSITE_DELEGATE_GETTER(doesNotThrow());
377 void setDoesNotThrow() {
378 CALLSITE_DELEGATE_SETTER(setDoesNotThrow());
381 unsigned getNumOperandBundles() const {
382 CALLSITE_DELEGATE_GETTER(getNumOperandBundles());
385 bool hasOperandBundles() const {
386 CALLSITE_DELEGATE_GETTER(hasOperandBundles());
389 unsigned getBundleOperandsStartIndex() const {
390 CALLSITE_DELEGATE_GETTER(getBundleOperandsStartIndex());
393 unsigned getBundleOperandsEndIndex() const {
394 CALLSITE_DELEGATE_GETTER(getBundleOperandsEndIndex());
397 unsigned getNumTotalBundleOperands() const {
398 CALLSITE_DELEGATE_GETTER(getNumTotalBundleOperands());
401 OperandBundleUse getOperandBundleAt(unsigned Index) const {
402 CALLSITE_DELEGATE_GETTER(getOperandBundleAt(Index));
405 Optional<OperandBundleUse> getOperandBundle(StringRef Name) const {
406 CALLSITE_DELEGATE_GETTER(getOperandBundle(Name));
409 Optional<OperandBundleUse> getOperandBundle(uint32_t ID) const {
410 CALLSITE_DELEGATE_GETTER(getOperandBundle(ID));
413 IterTy arg_begin() const {
414 CALLSITE_DELEGATE_GETTER(arg_begin());
417 IterTy arg_end() const {
418 CALLSITE_DELEGATE_GETTER(arg_end());
421 #undef CALLSITE_DELEGATE_GETTER
422 #undef CALLSITE_DELEGATE_SETTER
424 void getOperandBundlesAsDefs(SmallVectorImpl<OperandBundleDef> &Defs) const {
425 const Instruction *II = getInstruction();
426 // Since this is actually a getter that "looks like" a setter, don't use the
427 // above macros to avoid confusion.
429 cast<CallInst>(II)->getOperandBundlesAsDefs(Defs);
431 cast<InvokeInst>(II)->getOperandBundlesAsDefs(Defs);
434 /// @brief Determine whether this data operand is not captured.
435 bool doesNotCapture(unsigned OpNo) const {
436 return dataOperandHasImpliedAttr(OpNo + 1, Attribute::NoCapture);
439 /// @brief Determine whether this argument is passed by value.
440 bool isByValArgument(unsigned ArgNo) const {
441 return paramHasAttr(ArgNo + 1, Attribute::ByVal);
444 /// @brief Determine whether this argument is passed in an alloca.
445 bool isInAllocaArgument(unsigned ArgNo) const {
446 return paramHasAttr(ArgNo + 1, Attribute::InAlloca);
449 /// @brief Determine whether this argument is passed by value or in an alloca.
450 bool isByValOrInAllocaArgument(unsigned ArgNo) const {
451 return paramHasAttr(ArgNo + 1, Attribute::ByVal) ||
452 paramHasAttr(ArgNo + 1, Attribute::InAlloca);
455 /// @brief Determine if there are is an inalloca argument. Only the last
456 /// argument can have the inalloca attribute.
457 bool hasInAllocaArgument() const {
458 return paramHasAttr(arg_size(), Attribute::InAlloca);
461 bool doesNotAccessMemory(unsigned OpNo) const {
462 return dataOperandHasImpliedAttr(OpNo + 1, Attribute::ReadNone);
465 bool onlyReadsMemory(unsigned OpNo) const {
466 return dataOperandHasImpliedAttr(OpNo + 1, Attribute::ReadOnly) ||
467 dataOperandHasImpliedAttr(OpNo + 1, Attribute::ReadNone);
470 /// @brief Return true if the return value is known to be not null.
471 /// This may be because it has the nonnull attribute, or because at least
472 /// one byte is dereferenceable and the pointer is in addrspace(0).
473 bool isReturnNonNull() const {
474 if (paramHasAttr(0, Attribute::NonNull))
476 else if (getDereferenceableBytes(0) > 0 &&
477 getType()->getPointerAddressSpace() == 0)
483 /// hasArgument - Returns true if this CallSite passes the given Value* as an
484 /// argument to the called function.
485 bool hasArgument(const Value *Arg) const {
486 for (arg_iterator AI = this->arg_begin(), E = this->arg_end(); AI != E;
488 if (AI->get() == Arg)
494 IterTy getCallee() const {
495 if (isCall()) // Skip Callee
496 return cast<CallInst>(getInstruction())->op_end() - 1;
497 else // Skip BB, BB, Callee
498 return cast<InvokeInst>(getInstruction())->op_end() - 3;
502 class CallSite : public CallSiteBase<Function, BasicBlock, Value, User, Use,
503 Instruction, CallInst, InvokeInst,
507 CallSite(CallSiteBase B) : CallSiteBase(B) {}
508 CallSite(CallInst *CI) : CallSiteBase(CI) {}
509 CallSite(InvokeInst *II) : CallSiteBase(II) {}
510 explicit CallSite(Instruction *II) : CallSiteBase(II) {}
511 explicit CallSite(Value *V) : CallSiteBase(V) {}
513 bool operator==(const CallSite &CS) const { return I == CS.I; }
514 bool operator!=(const CallSite &CS) const { return I != CS.I; }
515 bool operator<(const CallSite &CS) const {
516 return getInstruction() < CS.getInstruction();
520 User::op_iterator getCallee() const;
523 /// ImmutableCallSite - establish a view to a call site for examination
524 class ImmutableCallSite : public CallSiteBase<> {
526 ImmutableCallSite() {}
527 ImmutableCallSite(const CallInst *CI) : CallSiteBase(CI) {}
528 ImmutableCallSite(const InvokeInst *II) : CallSiteBase(II) {}
529 explicit ImmutableCallSite(const Instruction *II) : CallSiteBase(II) {}
530 explicit ImmutableCallSite(const Value *V) : CallSiteBase(V) {}
531 ImmutableCallSite(CallSite CS) : CallSiteBase(CS.getInstruction()) {}
534 } // End llvm namespace