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//===-- llvm/Support/CallSite.h - Abstract Call & Invoke instrs -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file 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 (notice that it has only a single data member).
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_CALLSITE_H
#define LLVM_SUPPORT_CALLSITE_H
#include "llvm/Instruction.h"
#include "llvm/BasicBlock.h"
#include "llvm/ParameterAttributes.h"
namespace llvm {
class CallInst;
class InvokeInst;
class CallSite {
Instruction *I;
public:
CallSite() : I(0) {}
CallSite(CallInst *CI) : I(reinterpret_cast<Instruction*>(CI)) {}
CallSite(InvokeInst *II) : I(reinterpret_cast<Instruction*>(II)) {}
CallSite(Instruction *C);
CallSite(const CallSite &CS) : I(CS.I) {}
CallSite &operator=(const CallSite &CS) { I = CS.I; return *this; }
bool operator==(const CallSite &CS) const { return I == CS.I; }
bool operator!=(const CallSite &CS) const { return I != CS.I; }
/// 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(reinterpret_cast<CallInst*>(I));
else if (I->getOpcode() == Instruction::Invoke)
return CallSite(reinterpret_cast<InvokeInst*>(I));
}
return CallSite();
}
/// getCallingConv/setCallingConv - get or set the calling convention of the
/// call.
unsigned getCallingConv() const;
void setCallingConv(unsigned CC);
/// getParamAttrs/setParamAttrs - get or set the parameter attributes of
/// the call.
const PAListPtr &getParamAttrs() const;
void setParamAttrs(const PAListPtr &PAL);
/// paramHasAttr - whether the call or the callee has the given attribute.
bool paramHasAttr(uint16_t i, ParameterAttributes attr) const;
/// @brief Extract the alignment for a call or parameter (0=unknown).
uint16_t getParamAlignment(uint16_t i) const;
/// @brief Determine if the call does not access memory.
bool doesNotAccessMemory() const;
void setDoesNotAccessMemory(bool doesNotAccessMemory = true);
/// @brief Determine if the call does not access or only reads memory.
bool onlyReadsMemory() const;
void setOnlyReadsMemory(bool onlyReadsMemory = true);
/// @brief Determine if the call cannot return.
bool doesNotReturn() const;
void setDoesNotReturn(bool doesNotReturn = true);
/// @brief Determine if the call cannot unwind.
bool doesNotThrow() const;
void setDoesNotThrow(bool doesNotThrow = true);
/// 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; }
/// getCaller - Return the caller function for this call site
///
Function *getCaller() const { return I->getParent()->getParent(); }
/// 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).
///
Function *getCalledFunction() const {
return dyn_cast<Function>(getCalledValue());
}
/// setCalledFunction - Set the callee to the specified value...
///
void setCalledFunction(Value *V) {
assert(I && "Not a call or invoke instruction!");
I->setOperand(0, V);
}
Value *getArgument(unsigned ArgNo) const {
assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
return *(arg_begin()+ArgNo);
}
void setArgument(unsigned ArgNo, Value* newVal) {
assert(I && "Not a call or invoke instruction!");
assert(arg_begin() + ArgNo < arg_end() && "Argument # out of range!");
I->setOperand(getArgumentOffset() + ArgNo, newVal);
}
/// Given an operand number, returns the argument that corresponds to it.
/// OperandNo must be a valid operand number that actually corresponds to an
/// argument.
unsigned getArgumentNo(unsigned OperandNo) const {
assert(OperandNo >= getArgumentOffset() && "Operand number passed was not "
"a valid argument");
return OperandNo - getArgumentOffset();
}
/// hasArgument - Returns true if this CallSite passes the given Value* as an
/// argument to the called function.
bool hasArgument(const Value *Arg) const;
/// 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!");
return I->op_begin() + getArgumentOffset(); // Skip non-arguments
}
arg_iterator arg_end() const { return I->op_end(); }
bool arg_empty() const { return arg_end() == arg_begin(); }
unsigned arg_size() const { return unsigned(arg_end() - arg_begin()); }
bool operator<(const CallSite &CS) const {
return getInstruction() < CS.getInstruction();
}
private:
/// Returns the operand number of the first argument
unsigned getArgumentOffset() const {
if (I->getOpcode() == Instruction::Call)
return 1; // Skip Function
else
return 3; // Skip Function, BB, BB
}
};
} // End llvm namespace
#endif
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