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//===-- llvm/Support/CallSite.h - Abstract Call & Invoke instrs -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the CallSite class, which is a handy wrapper for code that
// wants to treat Call and Invoke instructions in a generic way.
//
// NOTE: This class is supposed to have "value semantics". So it should be
// passed by value, not by reference; it should not be "new"ed or "delete"d. It
// is efficiently copyable, assignable and constructable, with cost equivalent
// to copying a pointer. (You will notice that it has only a single data
// member.)
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_CALLSITE_H
#define LLVM_SUPPORT_CALLSITE_H
#include "llvm/Instruction.h"
class CallInst;
class InvokeInst;
class CallSite {
Instruction *I;
public:
CallSite() : I(0) {}
CallSite(CallInst *CI) : I((Instruction*)CI) {}
CallSite(InvokeInst *II) : I((Instruction*)II) {}
CallSite(const CallSite &CS) : I(CS.I) {}
CallSite &operator=(const CallSite &CS) { I = CS.I; return *this; }
/// CallSite::get - This static method is sort of like a constructor. It will
/// create an appropriate call site for a Call or Invoke instruction, but it
/// can also create a null initialized CallSite object for something which is
/// NOT a call site.
///
static CallSite get(Value *V) {
if (Instruction *I = dyn_cast<Instruction>(V)) {
if (I->getOpcode() == Instruction::Call)
return CallSite((CallInst*)I);
else if (I->getOpcode() == Instruction::Invoke)
return CallSite((InvokeInst*)I);
}
return CallSite();
}
/// getType - Return the type of the instruction that generated this call site
///
const Type *getType () const { return I->getType (); }
/// getInstruction - Return the instruction this call site corresponds to
///
Instruction *getInstruction() const { return I; }
/// getCalledValue - Return the pointer to function that is being called...
///
Value *getCalledValue() const {
assert(I && "Not a call or invoke instruction!");
return I->getOperand(0);
}
/// getCalledFunction - Return the function being called if this is a direct
/// call, otherwise return null (if it's an indirect call).
///
/// FIXME: This should be inlined once ConstantPointerRefs are gone. :(
Function *getCalledFunction() const;
/// setCalledFunction - Set the callee to the specified value...
///
void setCalledFunction(Value *V) {
assert(I && "Not a call or invoke instruction!");
I->setOperand(0, V);
}
/// arg_iterator - The type of iterator to use when looping over actual
/// arguments at this call site...
typedef User::op_iterator arg_iterator;
/// arg_begin/arg_end - Return iterators corresponding to the actual argument
/// list for a call site.
///
arg_iterator arg_begin() const {
assert(I && "Not a call or invoke instruction!");
if (I->getOpcode() == Instruction::Call)
return I->op_begin()+1; // Skip Function
else
return I->op_begin()+3; // Skip Function, BB, BB
}
arg_iterator arg_end() const { return I->op_end(); }
unsigned arg_size() const { return arg_end() - arg_begin(); }
bool operator<(const CallSite &CS) const {
return getInstruction() < CS.getInstruction();
}
};
#endif
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