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. (You will notice that it has only a single data
19 //===----------------------------------------------------------------------===//
21 #ifndef LLVM_SUPPORT_CALLSITE_H
22 #define LLVM_SUPPORT_CALLSITE_H
24 #include "llvm/Instruction.h"
33 CallSite(CallInst *CI) : I((Instruction*)CI) {}
34 CallSite(InvokeInst *II) : I((Instruction*)II) {}
35 CallSite(const CallSite &CS) : I(CS.I) {}
36 CallSite &operator=(const CallSite &CS) { I = CS.I; return *this; }
38 /// CallSite::get - This static method is sort of like a constructor. It will
39 /// create an appropriate call site for a Call or Invoke instruction, but it
40 /// can also create a null initialized CallSite object for something which is
43 static CallSite get(Value *V) {
44 if (Instruction *I = dyn_cast<Instruction>(V)) {
45 if (I->getOpcode() == Instruction::Call)
46 return CallSite((CallInst*)I);
47 else if (I->getOpcode() == Instruction::Invoke)
48 return CallSite((InvokeInst*)I);
53 /// getType - Return the type of the instruction that generated this call site
55 const Type *getType () const { return I->getType (); }
57 /// getInstruction - Return the instruction this call site corresponds to
59 Instruction *getInstruction() const { return I; }
61 /// getCalledValue - Return the pointer to function that is being called...
63 Value *getCalledValue() const {
64 assert(I && "Not a call or invoke instruction!");
65 return I->getOperand(0);
68 /// getCalledFunction - Return the function being called if this is a direct
69 /// call, otherwise return null (if it's an indirect call).
71 /// FIXME: This should be inlined once ConstantPointerRefs are gone. :(
72 Function *getCalledFunction() const;
74 /// setCalledFunction - Set the callee to the specified value...
76 void setCalledFunction(Value *V) {
77 assert(I && "Not a call or invoke instruction!");
81 /// arg_iterator - The type of iterator to use when looping over actual
82 /// arguments at this call site...
83 typedef User::op_iterator arg_iterator;
85 /// arg_begin/arg_end - Return iterators corresponding to the actual argument
86 /// list for a call site.
88 arg_iterator arg_begin() const {
89 assert(I && "Not a call or invoke instruction!");
90 if (I->getOpcode() == Instruction::Call)
91 return I->op_begin()+1; // Skip Function
93 return I->op_begin()+3; // Skip Function, BB, BB
95 arg_iterator arg_end() const { return I->op_end(); }
96 unsigned arg_size() const { return arg_end() - arg_begin(); }
98 bool operator<(const CallSite &CS) const {
99 return getInstruction() < CS.getInstruction();