1 //===-- llvm/Support/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_SUPPORT_CALLSITE_H
27 #define LLVM_SUPPORT_CALLSITE_H
29 #include "llvm/Attributes.h"
30 #include "llvm/ADT/PointerIntPair.h"
31 #include "llvm/BasicBlock.h"
32 #include "llvm/CallingConv.h"
33 #include "llvm/Instructions.h"
40 template <typename FunTy = const Function,
41 typename ValTy = const Value,
42 typename UserTy = const User,
43 typename InstrTy = const Instruction,
44 typename CallTy = const CallInst,
45 typename InvokeTy = const InvokeInst,
46 typename IterTy = User::const_op_iterator>
49 PointerIntPair<InstrTy*, 1, bool> I;
51 CallSiteBase() : I(0, false) {}
52 CallSiteBase(CallTy *CI) : I(CI, true) { /*assert(CI);*/ }
53 CallSiteBase(InvokeTy *II) : I(II, false) { /*assert(II);*/ }
54 CallSiteBase(ValTy *II) { *this = get(II); }
55 CallSiteBase(InstrTy *II) {
56 assert(II && "Null instruction given?");
60 /// CallSiteBase::get - This static method is sort of like a constructor. It
61 /// will create an appropriate call site for a Call or Invoke instruction, but
62 /// it can also create a null initialized CallSiteBase object for something
63 /// which is NOT a call site.
65 static CallSiteBase get(ValTy *V) {
66 if (InstrTy *II = dyn_cast<InstrTy>(V)) {
67 if (II->getOpcode() == Instruction::Call)
68 return CallSiteBase(static_cast<CallTy*>(II));
69 else if (II->getOpcode() == Instruction::Invoke)
70 return CallSiteBase(static_cast<InvokeTy*>(II));
72 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 operator bool() const { return I.getPointer(); }
88 /// getCalledValue - Return the pointer to function that is being called...
90 ValTy *getCalledValue() const {
91 assert(getInstruction() && "Not a call or invoke instruction!");
95 /// getCalledFunction - Return the function being called if this is a direct
96 /// call, otherwise return null (if it's an indirect call).
98 FunTy *getCalledFunction() const {
99 return dyn_cast<FunTy>(getCalledValue());
102 /// setCalledFunction - Set the callee to the specified value...
104 void setCalledFunction(Value *V) {
105 assert(getInstruction() && "Not a call or invoke instruction!");
109 /// isCallee - Determine whether the passed iterator points to the
110 /// callee operand's Use.
112 bool isCallee(value_use_iterator<UserTy> UI) const {
113 return getCallee() == &UI.getUse();
116 ValTy *getArgument(unsigned ArgNo) const {
117 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
118 return *(arg_begin()+ArgNo);
121 void setArgument(unsigned ArgNo, Value* newVal) {
122 assert(getInstruction() && "Not a call or invoke instruction!");
123 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
124 getInstruction()->setOperand(getArgumentOffset() + ArgNo, newVal);
127 /// Given a value use iterator, returns the argument that corresponds to it.
128 /// Iterator must actually correspond to an argument.
129 unsigned getArgumentNo(value_use_iterator<UserTy> I) const {
130 assert(getInstruction() && "Not a call or invoke instruction!");
131 assert(arg_begin() <= &I.getUse() && &I.getUse() < arg_end()
132 && "Argument # out of range!");
133 return &I.getUse() - arg_begin();
136 /// arg_iterator - The type of iterator to use when looping over actual
137 /// arguments at this call site...
138 typedef IterTy arg_iterator;
140 /// arg_begin/arg_end - Return iterators corresponding to the actual argument
141 /// list for a call site.
142 IterTy arg_begin() const {
143 assert(getInstruction() && "Not a call or invoke instruction!");
144 // Skip non-arguments
145 return (*this)->op_begin() + getArgumentOffset();
148 IterTy arg_end() const { return (*this)->op_end() - getArgumentEndOffset(); }
149 bool arg_empty() const { return arg_end() == arg_begin(); }
150 unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); }
152 /// getType - Return the type of the instruction that generated this call site
154 const Type *getType() const { return (*this)->getType(); }
156 /// getCaller - Return the caller function for this call site
158 FunTy *getCaller() const { return (*this)->getParent()->getParent(); }
160 #define CALLSITE_DELEGATE_GETTER(METHOD) \
161 InstrTy *II = getInstruction(); \
163 ? cast<CallInst>(II)->METHOD \
164 : cast<InvokeInst>(II)->METHOD
166 #define CALLSITE_DELEGATE_SETTER(METHOD) \
167 InstrTy *II = getInstruction(); \
169 cast<CallInst>(II)->METHOD; \
171 cast<InvokeInst>(II)->METHOD
173 /// getCallingConv/setCallingConv - get or set the calling convention of the
175 CallingConv::ID getCallingConv() const {
176 CALLSITE_DELEGATE_GETTER(getCallingConv());
178 void setCallingConv(CallingConv::ID CC) {
179 CALLSITE_DELEGATE_SETTER(setCallingConv(CC));
182 /// getAttributes/setAttributes - get or set the parameter attributes of
184 const AttrListPtr &getAttributes() const {
185 CALLSITE_DELEGATE_GETTER(getAttributes());
187 void setAttributes(const AttrListPtr &PAL) {
188 CALLSITE_DELEGATE_SETTER(setAttributes(PAL));
191 /// paramHasAttr - whether the call or the callee has the given attribute.
192 bool paramHasAttr(uint16_t i, Attributes attr) const {
193 CALLSITE_DELEGATE_GETTER(paramHasAttr(i, attr));
196 /// @brief Extract the alignment for a call or parameter (0=unknown).
197 uint16_t getParamAlignment(uint16_t i) const {
198 CALLSITE_DELEGATE_GETTER(getParamAlignment(i));
201 /// @brief Return true if the call should not be inlined.
202 bool isNoInline() const {
203 CALLSITE_DELEGATE_GETTER(isNoInline());
205 void setIsNoInline(bool Value = true) {
206 CALLSITE_DELEGATE_SETTER(setIsNoInline(Value));
209 /// @brief Determine if the call does not access memory.
210 bool doesNotAccessMemory() const {
211 CALLSITE_DELEGATE_GETTER(doesNotAccessMemory());
213 void setDoesNotAccessMemory(bool doesNotAccessMemory = true) {
214 CALLSITE_DELEGATE_SETTER(setDoesNotAccessMemory(doesNotAccessMemory));
217 /// @brief Determine if the call does not access or only reads memory.
218 bool onlyReadsMemory() const {
219 CALLSITE_DELEGATE_GETTER(onlyReadsMemory());
221 void setOnlyReadsMemory(bool onlyReadsMemory = true) {
222 CALLSITE_DELEGATE_SETTER(setOnlyReadsMemory(onlyReadsMemory));
225 /// @brief Determine if the call cannot return.
226 bool doesNotReturn() const {
227 CALLSITE_DELEGATE_GETTER(doesNotReturn());
229 void setDoesNotReturn(bool doesNotReturn = true) {
230 CALLSITE_DELEGATE_SETTER(setDoesNotReturn(doesNotReturn));
233 /// @brief Determine if the call cannot unwind.
234 bool doesNotThrow() const {
235 CALLSITE_DELEGATE_GETTER(doesNotThrow());
237 void setDoesNotThrow(bool doesNotThrow = true) {
238 CALLSITE_DELEGATE_SETTER(setDoesNotThrow(doesNotThrow));
241 #undef CALLSITE_DELEGATE_GETTER
242 #undef CALLSITE_DELEGATE_SETTER
244 /// hasArgument - Returns true if this CallSite passes the given Value* as an
245 /// argument to the called function.
246 bool hasArgument(const Value *Arg) const {
247 for (arg_iterator AI = this->arg_begin(), E = this->arg_end(); AI != E;
249 if (AI->get() == Arg)
255 /// Returns the operand number of the first argument
256 /// FIXME: remove this func!
257 unsigned getArgumentOffset() const {
258 return 0; // Args are at the front
261 unsigned getArgumentEndOffset() const {
263 return 1; // Skip Callee
265 return 3; // Skip BB, BB, Callee
268 IterTy getCallee() const {
269 // FIXME: this is slow, since we do not have the fast versions
270 // of the op_*() functions here. See CallSite::getCallee.
273 return getInstruction()->op_end() - 1; // Skip Callee
275 return getInstruction()->op_end() - 3; // Skip BB, BB, Callee
279 /// ImmutableCallSite - establish a view to a call site for examination
280 class ImmutableCallSite : public CallSiteBase<> {
281 typedef CallSiteBase<> Base;
283 ImmutableCallSite(const Value* V) : Base(V) {}
284 ImmutableCallSite(const CallInst *CI) : Base(CI) {}
285 ImmutableCallSite(const InvokeInst *II) : Base(II) {}
286 ImmutableCallSite(const Instruction *II) : Base(II) {}
289 class CallSite : public CallSiteBase<Function, Value, User, Instruction,
290 CallInst, InvokeInst, User::op_iterator> {
291 typedef CallSiteBase<Function, Value, User, Instruction,
292 CallInst, InvokeInst, User::op_iterator> Base;
295 CallSite(Base B) : Base(B) {}
296 CallSite(CallInst *CI) : Base(CI) {}
297 CallSite(InvokeInst *II) : Base(II) {}
298 CallSite(Instruction *II) : Base(II) {}
300 bool operator==(const CallSite &CS) const { return I == CS.I; }
301 bool operator!=(const CallSite &CS) const { return I != CS.I; }
303 /// CallSite::get - This static method is sort of like a constructor. It will
304 /// create an appropriate call site for a Call or Invoke instruction, but it
305 /// can also create a null initialized CallSite object for something which is
308 static CallSite get(Value *V) {
312 bool operator<(const CallSite &CS) const {
313 return getInstruction() < CS.getInstruction();
317 User::op_iterator getCallee() const;
320 } // End llvm namespace