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/IR/Attributes.h"
31 #include "llvm/IR/CallingConv.h"
32 #include "llvm/IR/Instructions.h"
39 template <typename FunTy = const Function,
40 typename ValTy = const Value,
41 typename UserTy = const User,
42 typename InstrTy = const Instruction,
43 typename CallTy = const CallInst,
44 typename InvokeTy = const InvokeInst,
45 typename IterTy = User::const_op_iterator>
48 PointerIntPair<InstrTy*, 1, bool> I;
50 CallSiteBase() : I(0, false) {}
51 CallSiteBase(CallTy *CI) : I(CI, true) { assert(CI); }
52 CallSiteBase(InvokeTy *II) : I(II, false) { assert(II); }
53 CallSiteBase(ValTy *II) { *this = get(II); }
55 /// CallSiteBase::get - This static method is sort of like a constructor. It
56 /// will create an appropriate call site for a Call or Invoke instruction, but
57 /// it can also create a null initialized CallSiteBase object for something
58 /// which is NOT a call site.
60 static CallSiteBase get(ValTy *V) {
61 if (InstrTy *II = dyn_cast<InstrTy>(V)) {
62 if (II->getOpcode() == Instruction::Call)
63 return CallSiteBase(static_cast<CallTy*>(II));
64 else if (II->getOpcode() == Instruction::Invoke)
65 return CallSiteBase(static_cast<InvokeTy*>(II));
67 return CallSiteBase();
70 /// isCall - true if a CallInst is enclosed.
71 /// Note that !isCall() does not mean it is an InvokeInst enclosed,
72 /// it also could signify a NULL Instruction pointer.
73 bool isCall() const { return I.getInt(); }
75 /// isInvoke - true if a InvokeInst is enclosed.
77 bool isInvoke() const { return getInstruction() && !I.getInt(); }
79 InstrTy *getInstruction() const { return I.getPointer(); }
80 InstrTy *operator->() const { return I.getPointer(); }
81 LLVM_EXPLICIT operator bool() const { return I.getPointer(); }
83 /// getCalledValue - Return the pointer to function that is being called.
85 ValTy *getCalledValue() const {
86 assert(getInstruction() && "Not a call or invoke instruction!");
90 /// getCalledFunction - Return the function being called if this is a direct
91 /// call, otherwise return null (if it's an indirect call).
93 FunTy *getCalledFunction() const {
94 return dyn_cast<FunTy>(getCalledValue());
97 /// setCalledFunction - Set the callee to the specified value.
99 void setCalledFunction(Value *V) {
100 assert(getInstruction() && "Not a call or invoke instruction!");
104 /// isCallee - Determine whether the passed iterator points to the
105 /// callee operand's Use.
106 bool isCallee(Value::const_user_iterator UI) const {
107 return isCallee(&UI.getUse());
110 /// Determine whether this Use is the callee operand's Use.
111 bool isCallee(const Use *U) const { return getCallee() == U; }
113 ValTy *getArgument(unsigned ArgNo) const {
114 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
115 return *(arg_begin() + ArgNo);
118 void setArgument(unsigned ArgNo, Value* newVal) {
119 assert(getInstruction() && "Not a call or invoke instruction!");
120 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
121 getInstruction()->setOperand(ArgNo, newVal);
124 /// Given a value use iterator, returns the argument that corresponds to it.
125 /// Iterator must actually correspond to an argument.
126 unsigned getArgumentNo(Value::const_user_iterator I) const {
127 return getArgumentNo(&I.getUse());
130 /// Given a use for an argument, get the argument number that corresponds to
132 unsigned getArgumentNo(const Use *U) const {
133 assert(getInstruction() && "Not a call or invoke instruction!");
134 assert(arg_begin() <= U && U < arg_end()
135 && "Argument # out of range!");
136 return U - arg_begin();
139 /// arg_iterator - The type of iterator to use when looping over actual
140 /// arguments at this call site.
141 typedef IterTy arg_iterator;
143 /// arg_begin/arg_end - Return iterators corresponding to the actual argument
144 /// list for a call site.
145 IterTy arg_begin() const {
146 assert(getInstruction() && "Not a call or invoke instruction!");
147 // Skip non-arguments
148 return (*this)->op_begin();
151 IterTy arg_end() const { return (*this)->op_end() - getArgumentEndOffset(); }
152 bool arg_empty() const { return arg_end() == arg_begin(); }
153 unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); }
155 /// getType - Return the type of the instruction that generated this call site
157 Type *getType() const { return (*this)->getType(); }
159 /// getCaller - Return the caller function for this call site
161 FunTy *getCaller() const { return (*this)->getParent()->getParent(); }
163 #define CALLSITE_DELEGATE_GETTER(METHOD) \
164 InstrTy *II = getInstruction(); \
166 ? cast<CallInst>(II)->METHOD \
167 : cast<InvokeInst>(II)->METHOD
169 #define CALLSITE_DELEGATE_SETTER(METHOD) \
170 InstrTy *II = getInstruction(); \
172 cast<CallInst>(II)->METHOD; \
174 cast<InvokeInst>(II)->METHOD
176 /// getCallingConv/setCallingConv - get or set the calling convention of the
178 CallingConv::ID getCallingConv() const {
179 CALLSITE_DELEGATE_GETTER(getCallingConv());
181 void setCallingConv(CallingConv::ID CC) {
182 CALLSITE_DELEGATE_SETTER(setCallingConv(CC));
185 /// getAttributes/setAttributes - get or set the parameter attributes of
187 const AttributeSet &getAttributes() const {
188 CALLSITE_DELEGATE_GETTER(getAttributes());
190 void setAttributes(const AttributeSet &PAL) {
191 CALLSITE_DELEGATE_SETTER(setAttributes(PAL));
194 /// \brief Return true if this function has the given attribute.
195 bool hasFnAttr(Attribute::AttrKind A) const {
196 CALLSITE_DELEGATE_GETTER(hasFnAttr(A));
199 /// \brief Return true if the call or the callee has the given attribute.
200 bool paramHasAttr(unsigned i, Attribute::AttrKind A) const {
201 CALLSITE_DELEGATE_GETTER(paramHasAttr(i, A));
204 /// @brief Extract the alignment for a call or parameter (0=unknown).
205 uint16_t getParamAlignment(uint16_t i) const {
206 CALLSITE_DELEGATE_GETTER(getParamAlignment(i));
209 /// \brief Return true if the call should not be treated as a call to a
211 bool isNoBuiltin() const {
212 CALLSITE_DELEGATE_GETTER(isNoBuiltin());
215 /// @brief Return true if the call should not be inlined.
216 bool isNoInline() const {
217 CALLSITE_DELEGATE_GETTER(isNoInline());
219 void setIsNoInline(bool Value = true) {
220 CALLSITE_DELEGATE_SETTER(setIsNoInline(Value));
223 /// @brief Determine if the call does not access memory.
224 bool doesNotAccessMemory() const {
225 CALLSITE_DELEGATE_GETTER(doesNotAccessMemory());
227 void setDoesNotAccessMemory() {
228 CALLSITE_DELEGATE_SETTER(setDoesNotAccessMemory());
231 /// @brief Determine if the call does not access or only reads memory.
232 bool onlyReadsMemory() const {
233 CALLSITE_DELEGATE_GETTER(onlyReadsMemory());
235 void setOnlyReadsMemory() {
236 CALLSITE_DELEGATE_SETTER(setOnlyReadsMemory());
239 /// @brief Determine if the call cannot return.
240 bool doesNotReturn() const {
241 CALLSITE_DELEGATE_GETTER(doesNotReturn());
243 void setDoesNotReturn() {
244 CALLSITE_DELEGATE_SETTER(setDoesNotReturn());
247 /// @brief Determine if the call cannot unwind.
248 bool doesNotThrow() const {
249 CALLSITE_DELEGATE_GETTER(doesNotThrow());
251 void setDoesNotThrow() {
252 CALLSITE_DELEGATE_SETTER(setDoesNotThrow());
255 #undef CALLSITE_DELEGATE_GETTER
256 #undef CALLSITE_DELEGATE_SETTER
258 /// @brief Determine whether this argument is not captured.
259 bool doesNotCapture(unsigned ArgNo) const {
260 return paramHasAttr(ArgNo + 1, Attribute::NoCapture);
263 /// @brief Determine whether this argument is passed by value.
264 bool isByValArgument(unsigned ArgNo) const {
265 return paramHasAttr(ArgNo + 1, Attribute::ByVal);
268 /// @brief Determine whether this argument is passed in an alloca.
269 bool isInAllocaArgument(unsigned ArgNo) const {
270 return paramHasAttr(ArgNo + 1, Attribute::InAlloca);
273 /// @brief Determine whether this argument is passed by value or in an alloca.
274 bool isByValOrInAllocaArgument(unsigned ArgNo) const {
275 return paramHasAttr(ArgNo + 1, Attribute::ByVal) ||
276 paramHasAttr(ArgNo + 1, Attribute::InAlloca);
279 /// @brief Determine if there are is an inalloca argument. Only the last
280 /// argument can have the inalloca attribute.
281 bool hasInAllocaArgument() const {
282 return paramHasAttr(arg_size(), Attribute::InAlloca);
285 bool doesNotAccessMemory(unsigned ArgNo) const {
286 return paramHasAttr(ArgNo + 1, Attribute::ReadNone);
289 bool onlyReadsMemory(unsigned ArgNo) const {
290 return paramHasAttr(ArgNo + 1, Attribute::ReadOnly) ||
291 paramHasAttr(ArgNo + 1, Attribute::ReadNone);
294 /// hasArgument - Returns true if this CallSite passes the given Value* as an
295 /// argument to the called function.
296 bool hasArgument(const Value *Arg) const {
297 for (arg_iterator AI = this->arg_begin(), E = this->arg_end(); AI != E;
299 if (AI->get() == Arg)
305 unsigned getArgumentEndOffset() const {
307 return 1; // Skip Callee
309 return 3; // Skip BB, BB, Callee
312 IterTy getCallee() const {
313 if (isCall()) // Skip Callee
314 return cast<CallInst>(getInstruction())->op_end() - 1;
315 else // Skip BB, BB, Callee
316 return cast<InvokeInst>(getInstruction())->op_end() - 3;
320 class CallSite : public CallSiteBase<Function, Value, User, Instruction,
321 CallInst, InvokeInst, User::op_iterator> {
322 typedef CallSiteBase<Function, Value, User, Instruction,
323 CallInst, InvokeInst, User::op_iterator> Base;
326 CallSite(Base B) : Base(B) {}
327 CallSite(Value* V) : Base(V) {}
328 CallSite(CallInst *CI) : Base(CI) {}
329 CallSite(InvokeInst *II) : Base(II) {}
330 CallSite(Instruction *II) : Base(II) {}
332 bool operator==(const CallSite &CS) const { return I == CS.I; }
333 bool operator!=(const CallSite &CS) const { return I != CS.I; }
334 bool operator<(const CallSite &CS) const {
335 return getInstruction() < CS.getInstruction();
339 User::op_iterator getCallee() const;
342 /// ImmutableCallSite - establish a view to a call site for examination
343 class ImmutableCallSite : public CallSiteBase<> {
344 typedef CallSiteBase<> Base;
346 ImmutableCallSite(const Value* V) : Base(V) {}
347 ImmutableCallSite(const CallInst *CI) : Base(CI) {}
348 ImmutableCallSite(const InvokeInst *II) : Base(II) {}
349 ImmutableCallSite(const Instruction *II) : Base(II) {}
350 ImmutableCallSite(CallSite CS) : Base(CS.getInstruction()) {}
353 } // End llvm namespace