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