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 assert(getInstruction() == U->getUser());
130 return arg_begin() <= U && U < arg_end();
133 /// \brief Determine whether the passed iterator points to a bundle operand.
134 bool isBundleOperand(Value::const_user_iterator UI) const {
135 return isBundleOperand(&UI.getUse());
138 /// \brief Determine whether the passed use points to a bundle operand.
139 bool isBundleOperand(const Use *U) const {
140 assert(getInstruction() == U->getUser());
141 if (!hasOperandBundles())
143 unsigned OperandNo = U - (*this)->op_begin();
144 return getBundleOperandsStartIndex() <= OperandNo &&
145 OperandNo < getBundleOperandsEndIndex();
148 /// \brief Determine whether the passed iterator points to a data operand.
149 bool isDataOperand(Value::const_user_iterator UI) const {
150 return isDataOperand(&UI.getUse());
153 /// \brief Determine whether the passed use points to a data operand.
154 bool isDataOperand(const Use *U) const {
155 return data_operands_begin() <= U && U < data_operands_end();
158 ValTy *getArgument(unsigned ArgNo) const {
159 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
160 return *(arg_begin() + ArgNo);
163 void setArgument(unsigned ArgNo, Value* newVal) {
164 assert(getInstruction() && "Not a call or invoke instruction!");
165 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
166 getInstruction()->setOperand(ArgNo, newVal);
169 /// Given a value use iterator, returns the argument that corresponds to it.
170 /// Iterator must actually correspond to an argument.
171 unsigned getArgumentNo(Value::const_user_iterator I) const {
172 return getArgumentNo(&I.getUse());
175 /// Given a use for an argument, get the argument number that corresponds to
177 unsigned getArgumentNo(const Use *U) const {
178 assert(getInstruction() && "Not a call or invoke instruction!");
179 assert(isArgOperand(U) && "Argument # out of range!");
180 return U - arg_begin();
183 /// arg_iterator - The type of iterator to use when looping over actual
184 /// arguments at this call site.
185 typedef IterTy arg_iterator;
187 iterator_range<IterTy> args() const {
188 return make_range(arg_begin(), arg_end());
190 bool arg_empty() const { return arg_end() == arg_begin(); }
191 unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); }
193 /// Given a value use iterator, returns the data operand that corresponds to
195 /// Iterator must actually correspond to a data operand.
196 unsigned getDataOperandNo(Value::const_user_iterator UI) const {
197 return getDataOperandNo(&UI.getUse());
200 /// Given a use for a data operand, get the data operand number that
201 /// corresponds to it.
202 unsigned getDataOperandNo(const Use *U) const {
203 assert(getInstruction() && "Not a call or invoke instruction!");
204 assert(isDataOperand(U) && "Data operand # out of range!");
205 return U - data_operands_begin();
208 /// Type of iterator to use when looping over data operands at this call site
210 typedef IterTy data_operand_iterator;
212 /// data_operands_begin/data_operands_end - Return iterators iterating over
213 /// the call / invoke argument list and bundle operands. For invokes, this is
214 /// the set of instruction operands except the invoke target and the two
215 /// successor blocks; and for calls this is the set of instruction operands
216 /// except the call target.
218 IterTy data_operands_begin() const {
219 assert(getInstruction() && "Not a call or invoke instruction!");
220 return (*this)->op_begin();
222 IterTy data_operands_end() const {
223 assert(getInstruction() && "Not a call or invoke instruction!");
224 return (*this)->op_end() - (isCall() ? 1 : 3);
226 iterator_range<IterTy> data_ops() const {
227 return make_range(data_operands_begin(), data_operands_end());
229 bool data_operands_empty() const {
230 return data_operands_end() == data_operands_begin();
232 unsigned data_operands_size() const {
233 return std::distance(data_operands_begin(), data_operands_end());
236 /// getType - Return the type of the instruction that generated this call site
238 Type *getType() const { return (*this)->getType(); }
240 /// getCaller - Return the caller function for this call site
242 FunTy *getCaller() const { return (*this)->getParent()->getParent(); }
244 /// \brief Tests if this call site must be tail call optimized. Only a
245 /// CallInst can be tail call optimized.
246 bool isMustTailCall() const {
247 return isCall() && cast<CallInst>(getInstruction())->isMustTailCall();
250 /// \brief Tests if this call site is marked as a tail call.
251 bool isTailCall() const {
252 return isCall() && cast<CallInst>(getInstruction())->isTailCall();
255 #define CALLSITE_DELEGATE_GETTER(METHOD) \
256 InstrTy *II = getInstruction(); \
258 ? cast<CallInst>(II)->METHOD \
259 : cast<InvokeInst>(II)->METHOD
261 #define CALLSITE_DELEGATE_SETTER(METHOD) \
262 InstrTy *II = getInstruction(); \
264 cast<CallInst>(II)->METHOD; \
266 cast<InvokeInst>(II)->METHOD
268 unsigned getNumArgOperands() const {
269 CALLSITE_DELEGATE_GETTER(getNumArgOperands());
272 ValTy *getArgOperand(unsigned i) const {
273 CALLSITE_DELEGATE_GETTER(getArgOperand(i));
276 bool isInlineAsm() const {
278 return cast<CallInst>(getInstruction())->isInlineAsm();
282 /// getCallingConv/setCallingConv - get or set the calling convention of the
284 CallingConv::ID getCallingConv() const {
285 CALLSITE_DELEGATE_GETTER(getCallingConv());
287 void setCallingConv(CallingConv::ID CC) {
288 CALLSITE_DELEGATE_SETTER(setCallingConv(CC));
291 FunctionType *getFunctionType() const {
292 CALLSITE_DELEGATE_GETTER(getFunctionType());
295 void mutateFunctionType(FunctionType *Ty) const {
296 CALLSITE_DELEGATE_SETTER(mutateFunctionType(Ty));
299 /// getAttributes/setAttributes - get or set the parameter attributes of
301 const AttributeSet &getAttributes() const {
302 CALLSITE_DELEGATE_GETTER(getAttributes());
304 void setAttributes(const AttributeSet &PAL) {
305 CALLSITE_DELEGATE_SETTER(setAttributes(PAL));
308 /// \brief Return true if this function has the given attribute.
309 bool hasFnAttr(Attribute::AttrKind A) const {
310 CALLSITE_DELEGATE_GETTER(hasFnAttr(A));
313 /// \brief Return true if the call or the callee has the given attribute.
314 bool paramHasAttr(unsigned i, Attribute::AttrKind A) const {
315 CALLSITE_DELEGATE_GETTER(paramHasAttr(i, A));
318 /// \brief Return true if the data operand at index \p i directly or
319 /// indirectly has the attribute \p A.
321 /// Normal call or invoke arguments have per operand attributes, as specified
322 /// in the attribute set attached to this instruction, while operand bundle
323 /// operands may have some attributes implied by the type of its containing
325 bool dataOperandHasImpliedAttr(unsigned i, Attribute::AttrKind A) const {
326 CALLSITE_DELEGATE_GETTER(dataOperandHasImpliedAttr(i, A));
329 /// @brief Extract the alignment for a call or parameter (0=unknown).
330 uint16_t getParamAlignment(uint16_t i) const {
331 CALLSITE_DELEGATE_GETTER(getParamAlignment(i));
334 /// @brief Extract the number of dereferenceable bytes for a call or
335 /// parameter (0=unknown).
336 uint64_t getDereferenceableBytes(uint16_t i) const {
337 CALLSITE_DELEGATE_GETTER(getDereferenceableBytes(i));
340 /// @brief Extract the number of dereferenceable_or_null bytes for a call or
341 /// parameter (0=unknown).
342 uint64_t getDereferenceableOrNullBytes(uint16_t i) const {
343 CALLSITE_DELEGATE_GETTER(getDereferenceableOrNullBytes(i));
346 /// @brief Determine if the parameter or return value is marked with NoAlias
348 /// @param n The parameter to check. 1 is the first parameter, 0 is the return
349 bool doesNotAlias(unsigned n) const {
350 CALLSITE_DELEGATE_GETTER(doesNotAlias(n));
353 /// \brief Return true if the call should not be treated as a call to a
355 bool isNoBuiltin() const {
356 CALLSITE_DELEGATE_GETTER(isNoBuiltin());
359 /// @brief Return true if the call should not be inlined.
360 bool isNoInline() const {
361 CALLSITE_DELEGATE_GETTER(isNoInline());
363 void setIsNoInline(bool Value = true) {
364 CALLSITE_DELEGATE_SETTER(setIsNoInline(Value));
367 /// @brief Determine if the call does not access memory.
368 bool doesNotAccessMemory() const {
369 CALLSITE_DELEGATE_GETTER(doesNotAccessMemory());
371 void setDoesNotAccessMemory() {
372 CALLSITE_DELEGATE_SETTER(setDoesNotAccessMemory());
375 /// @brief Determine if the call does not access or only reads memory.
376 bool onlyReadsMemory() const {
377 CALLSITE_DELEGATE_GETTER(onlyReadsMemory());
379 void setOnlyReadsMemory() {
380 CALLSITE_DELEGATE_SETTER(setOnlyReadsMemory());
383 /// @brief Determine if the call can access memmory only using pointers based
384 /// on its arguments.
385 bool onlyAccessesArgMemory() const {
386 CALLSITE_DELEGATE_GETTER(onlyAccessesArgMemory());
388 void setOnlyAccessesArgMemory() {
389 CALLSITE_DELEGATE_SETTER(setOnlyAccessesArgMemory());
392 /// @brief Determine if the call cannot return.
393 bool doesNotReturn() const {
394 CALLSITE_DELEGATE_GETTER(doesNotReturn());
396 void setDoesNotReturn() {
397 CALLSITE_DELEGATE_SETTER(setDoesNotReturn());
400 /// @brief Determine if the call cannot unwind.
401 bool doesNotThrow() const {
402 CALLSITE_DELEGATE_GETTER(doesNotThrow());
404 void setDoesNotThrow() {
405 CALLSITE_DELEGATE_SETTER(setDoesNotThrow());
408 unsigned getNumOperandBundles() const {
409 CALLSITE_DELEGATE_GETTER(getNumOperandBundles());
412 bool hasOperandBundles() const {
413 CALLSITE_DELEGATE_GETTER(hasOperandBundles());
416 unsigned getBundleOperandsStartIndex() const {
417 CALLSITE_DELEGATE_GETTER(getBundleOperandsStartIndex());
420 unsigned getBundleOperandsEndIndex() const {
421 CALLSITE_DELEGATE_GETTER(getBundleOperandsEndIndex());
424 unsigned getNumTotalBundleOperands() const {
425 CALLSITE_DELEGATE_GETTER(getNumTotalBundleOperands());
428 OperandBundleUse getOperandBundleAt(unsigned Index) const {
429 CALLSITE_DELEGATE_GETTER(getOperandBundleAt(Index));
432 Optional<OperandBundleUse> getOperandBundle(StringRef Name) const {
433 CALLSITE_DELEGATE_GETTER(getOperandBundle(Name));
436 Optional<OperandBundleUse> getOperandBundle(uint32_t ID) const {
437 CALLSITE_DELEGATE_GETTER(getOperandBundle(ID));
440 IterTy arg_begin() const {
441 CALLSITE_DELEGATE_GETTER(arg_begin());
444 IterTy arg_end() const {
445 CALLSITE_DELEGATE_GETTER(arg_end());
448 #undef CALLSITE_DELEGATE_GETTER
449 #undef CALLSITE_DELEGATE_SETTER
451 void getOperandBundlesAsDefs(SmallVectorImpl<OperandBundleDef> &Defs) const {
452 const Instruction *II = getInstruction();
453 // Since this is actually a getter that "looks like" a setter, don't use the
454 // above macros to avoid confusion.
456 cast<CallInst>(II)->getOperandBundlesAsDefs(Defs);
458 cast<InvokeInst>(II)->getOperandBundlesAsDefs(Defs);
461 /// @brief Determine whether this data operand is not captured.
462 bool doesNotCapture(unsigned OpNo) const {
463 return dataOperandHasImpliedAttr(OpNo + 1, Attribute::NoCapture);
466 /// @brief Determine whether this argument is passed by value.
467 bool isByValArgument(unsigned ArgNo) const {
468 return paramHasAttr(ArgNo + 1, Attribute::ByVal);
471 /// @brief Determine whether this argument is passed in an alloca.
472 bool isInAllocaArgument(unsigned ArgNo) const {
473 return paramHasAttr(ArgNo + 1, Attribute::InAlloca);
476 /// @brief Determine whether this argument is passed by value or in an alloca.
477 bool isByValOrInAllocaArgument(unsigned ArgNo) const {
478 return paramHasAttr(ArgNo + 1, Attribute::ByVal) ||
479 paramHasAttr(ArgNo + 1, Attribute::InAlloca);
482 /// @brief Determine if there are is an inalloca argument. Only the last
483 /// argument can have the inalloca attribute.
484 bool hasInAllocaArgument() const {
485 return paramHasAttr(arg_size(), Attribute::InAlloca);
488 bool doesNotAccessMemory(unsigned OpNo) const {
489 return dataOperandHasImpliedAttr(OpNo + 1, Attribute::ReadNone);
492 bool onlyReadsMemory(unsigned OpNo) const {
493 return dataOperandHasImpliedAttr(OpNo + 1, Attribute::ReadOnly) ||
494 dataOperandHasImpliedAttr(OpNo + 1, Attribute::ReadNone);
497 /// @brief Return true if the return value is known to be not null.
498 /// This may be because it has the nonnull attribute, or because at least
499 /// one byte is dereferenceable and the pointer is in addrspace(0).
500 bool isReturnNonNull() const {
501 if (paramHasAttr(0, Attribute::NonNull))
503 else if (getDereferenceableBytes(0) > 0 &&
504 getType()->getPointerAddressSpace() == 0)
510 /// hasArgument - Returns true if this CallSite passes the given Value* as an
511 /// argument to the called function.
512 bool hasArgument(const Value *Arg) const {
513 for (arg_iterator AI = this->arg_begin(), E = this->arg_end(); AI != E;
515 if (AI->get() == Arg)
521 IterTy getCallee() const {
522 if (isCall()) // Skip Callee
523 return cast<CallInst>(getInstruction())->op_end() - 1;
524 else // Skip BB, BB, Callee
525 return cast<InvokeInst>(getInstruction())->op_end() - 3;
529 class CallSite : public CallSiteBase<Function, BasicBlock, Value, User, Use,
530 Instruction, CallInst, InvokeInst,
534 CallSite(CallSiteBase B) : CallSiteBase(B) {}
535 CallSite(CallInst *CI) : CallSiteBase(CI) {}
536 CallSite(InvokeInst *II) : CallSiteBase(II) {}
537 explicit CallSite(Instruction *II) : CallSiteBase(II) {}
538 explicit CallSite(Value *V) : CallSiteBase(V) {}
540 bool operator==(const CallSite &CS) const { return I == CS.I; }
541 bool operator!=(const CallSite &CS) const { return I != CS.I; }
542 bool operator<(const CallSite &CS) const {
543 return getInstruction() < CS.getInstruction();
547 User::op_iterator getCallee() const;
550 /// ImmutableCallSite - establish a view to a call site for examination
551 class ImmutableCallSite : public CallSiteBase<> {
553 ImmutableCallSite() {}
554 ImmutableCallSite(const CallInst *CI) : CallSiteBase(CI) {}
555 ImmutableCallSite(const InvokeInst *II) : CallSiteBase(II) {}
556 explicit ImmutableCallSite(const Instruction *II) : CallSiteBase(II) {}
557 explicit ImmutableCallSite(const Value *V) : CallSiteBase(V) {}
558 ImmutableCallSite(CallSite CS) : CallSiteBase(CS.getInstruction()) {}
561 } // End llvm namespace