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 /// @brief Determine if the call does not access memory.
71 bool doesNotAccessMemory() const;
73 /// @brief Determine if the call does not access or only reads memory.
74 bool onlyReadsMemory() const;
76 /// @brief Determine if the call cannot unwind.
77 bool isNoUnwind() const;
79 /// getType - Return the type of the instruction that generated this call site
81 const Type *getType() const { return I->getType(); }
83 /// getInstruction - Return the instruction this call site corresponds to
85 Instruction *getInstruction() const { return I; }
87 /// getCaller - Return the caller function for this call site
89 Function *getCaller() const { return I->getParent()->getParent(); }
91 /// getCalledValue - Return the pointer to function that is being called...
93 Value *getCalledValue() const {
94 assert(I && "Not a call or invoke instruction!");
95 return I->getOperand(0);
98 /// getCalledFunction - Return the function being called if this is a direct
99 /// call, otherwise return null (if it's an indirect call).
101 Function *getCalledFunction() const {
102 return dyn_cast<Function>(getCalledValue());
105 /// setCalledFunction - Set the callee to the specified value...
107 void setCalledFunction(Value *V) {
108 assert(I && "Not a call or invoke instruction!");
112 Value *getArgument(unsigned ArgNo) const {
113 assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
114 return *(arg_begin()+ArgNo);
117 /// arg_iterator - The type of iterator to use when looping over actual
118 /// arguments at this call site...
119 typedef User::op_iterator arg_iterator;
121 /// arg_begin/arg_end - Return iterators corresponding to the actual argument
122 /// list for a call site.
124 arg_iterator arg_begin() const {
125 assert(I && "Not a call or invoke instruction!");
126 if (I->getOpcode() == Instruction::Call)
127 return I->op_begin()+1; // Skip Function
129 return I->op_begin()+3; // Skip Function, BB, BB
131 arg_iterator arg_end() const { return I->op_end(); }
132 bool arg_empty() const { return arg_end() == arg_begin(); }
133 unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); }
135 bool operator<(const CallSite &CS) const {
136 return getInstruction() < CS.getInstruction();
140 } // End llvm namespace