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.
13 // NOTE: This class is supposed to have "value semantics". So it should be
14 // passed by value, not by reference; it should not be "new"ed or "delete"d. It
15 // is efficiently copyable, assignable and constructable, with cost equivalent
16 // to copying a pointer (notice that it has only a single data member).
18 //===----------------------------------------------------------------------===//
20 #ifndef LLVM_SUPPORT_CALLSITE_H
21 #define LLVM_SUPPORT_CALLSITE_H
23 #include "llvm/Instruction.h"
24 #include "llvm/BasicBlock.h"
25 #include "llvm/ParameterAttributes.h"
37 CallSite(CallInst *CI) : I(reinterpret_cast<Instruction*>(CI)) {}
38 CallSite(InvokeInst *II) : I(reinterpret_cast<Instruction*>(II)) {}
39 CallSite(Instruction *C);
40 CallSite(const CallSite &CS) : I(CS.I) {}
41 CallSite &operator=(const CallSite &CS) { I = CS.I; return *this; }
43 /// CallSite::get - This static method is sort of like a constructor. It will
44 /// create an appropriate call site for a Call or Invoke instruction, but it
45 /// can also create a null initialized CallSite object for something which is
48 static CallSite get(Value *V) {
49 if (Instruction *I = dyn_cast<Instruction>(V)) {
50 if (I->getOpcode() == Instruction::Call)
51 return CallSite(reinterpret_cast<CallInst*>(I));
52 else if (I->getOpcode() == Instruction::Invoke)
53 return CallSite(reinterpret_cast<InvokeInst*>(I));
58 /// getCallingConv/setCallingConv - get or set the calling convention of the
60 unsigned getCallingConv() const;
61 void setCallingConv(unsigned CC);
63 /// getParamAttrs/setParamAttrs - get or set the parameter attributes of
65 const ParamAttrsList *getParamAttrs() const;
66 void setParamAttrs(const ParamAttrsList *PAL);
68 /// paramHasAttr - whether the call or the callee has the given attribute.
69 bool paramHasAttr(uint16_t i, ParameterAttributes attr) const;
71 /// @brief Determine if the call does not access memory.
72 bool doesNotAccessMemory() const;
74 /// @brief Determine if the call does not access or only reads memory.
75 bool onlyReadsMemory() const;
77 /// @brief Determine if the call cannot unwind.
78 bool doesNotThrow() const;
79 void setDoesNotThrow(bool doesNotThrow = true);
81 /// getType - Return the type of the instruction that generated this call site
83 const Type *getType() const { return I->getType(); }
85 /// getInstruction - Return the instruction this call site corresponds to
87 Instruction *getInstruction() const { return I; }
89 /// getCaller - Return the caller function for this call site
91 Function *getCaller() const { return I->getParent()->getParent(); }
93 /// getCalledValue - Return the pointer to function that is being called...
95 Value *getCalledValue() const {
96 assert(I && "Not a call or invoke instruction!");
97 return I->getOperand(0);
100 /// getCalledFunction - Return the function being called if this is a direct
101 /// call, otherwise return null (if it's an indirect call).
103 Function *getCalledFunction() const {
104 return dyn_cast<Function>(getCalledValue());
107 /// setCalledFunction - Set the callee to the specified value...
109 void setCalledFunction(Value *V) {
110 assert(I && "Not a call or invoke instruction!");
114 Value *getArgument(unsigned ArgNo) const {
115 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
116 return *(arg_begin()+ArgNo);
119 void setArgument(unsigned ArgNo, Value* newVal) {
120 assert(I && "Not a call or invoke instruction!");
121 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
122 if (I->getOpcode() == Instruction::Call)
123 I->setOperand(ArgNo+1, newVal); // Skip Function
125 I->setOperand(ArgNo+3, newVal); // Skip Function, BB, BB
128 /// arg_iterator - The type of iterator to use when looping over actual
129 /// arguments at this call site...
130 typedef User::op_iterator arg_iterator;
132 /// arg_begin/arg_end - Return iterators corresponding to the actual argument
133 /// list for a call site.
135 arg_iterator arg_begin() const {
136 assert(I && "Not a call or invoke instruction!");
137 if (I->getOpcode() == Instruction::Call)
138 return I->op_begin()+1; // Skip Function
140 return I->op_begin()+3; // Skip Function, BB, BB
142 arg_iterator arg_end() const { return I->op_end(); }
143 bool arg_empty() const { return arg_end() == arg_begin(); }
144 unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); }
146 bool operator<(const CallSite &CS) const {
147 return getInstruction() < CS.getInstruction();
151 } // End llvm namespace