1 //===-- llvm/Support/CallSite.h - Abstract Call & Invoke instrs -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source 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(const CallSite &CS) : I(CS.I) {}
40 CallSite &operator=(const CallSite &CS) { I = CS.I; return *this; }
42 /// CallSite::get - This static method is sort of like a constructor. It will
43 /// create an appropriate call site for a Call or Invoke instruction, but it
44 /// can also create a null initialized CallSite object for something which is
47 static CallSite get(Value *V) {
48 if (Instruction *I = dyn_cast<Instruction>(V)) {
49 if (I->getOpcode() == Instruction::Call)
50 return CallSite(reinterpret_cast<CallInst*>(I));
51 else if (I->getOpcode() == Instruction::Invoke)
52 return CallSite(reinterpret_cast<InvokeInst*>(I));
57 /// getCallingConv/setCallingConv - get or set the calling convention of the
59 unsigned getCallingConv() const;
60 void setCallingConv(unsigned CC);
62 /// getParamAttrs/setParamAttrs - get or set the parameter attributes of
64 const ParamAttrsList *getParamAttrs() const;
65 void setParamAttrs(const ParamAttrsList *PAL);
67 /// paramHasAttr - whether the call or the callee has the given attribute.
68 bool paramHasAttr(uint16_t i, ParameterAttributes attr) const;
70 /// getType - Return the type of the instruction that generated this call site
72 const Type *getType() const { return I->getType(); }
74 /// getInstruction - Return the instruction this call site corresponds to
76 Instruction *getInstruction() const { return I; }
78 /// getCaller - Return the caller function for this call site
80 Function *getCaller() const { return I->getParent()->getParent(); }
82 /// getCalledValue - Return the pointer to function that is being called...
84 Value *getCalledValue() const {
85 assert(I && "Not a call or invoke instruction!");
86 return I->getOperand(0);
89 /// getCalledFunction - Return the function being called if this is a direct
90 /// call, otherwise return null (if it's an indirect call).
92 Function *getCalledFunction() const {
93 return dyn_cast<Function>(getCalledValue());
96 /// setCalledFunction - Set the callee to the specified value...
98 void setCalledFunction(Value *V) {
99 assert(I && "Not a call or invoke instruction!");
103 Value *getArgument(unsigned ArgNo) const {
104 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
105 return *(arg_begin()+ArgNo);
108 /// arg_iterator - The type of iterator to use when looping over actual
109 /// arguments at this call site...
110 typedef User::op_iterator arg_iterator;
112 /// arg_begin/arg_end - Return iterators corresponding to the actual argument
113 /// list for a call site.
115 arg_iterator arg_begin() const {
116 assert(I && "Not a call or invoke instruction!");
117 if (I->getOpcode() == Instruction::Call)
118 return I->op_begin()+1; // Skip Function
120 return I->op_begin()+3; // Skip Function, BB, BB
122 arg_iterator arg_end() const { return I->op_end(); }
123 bool arg_empty() const { return arg_end() == arg_begin(); }
124 unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); }
126 bool operator<(const CallSite &CS) const {
127 return getInstruction() < CS.getInstruction();
131 } // End llvm namespace