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llvm-mirror/include/llvm/iTerminators.h
Chris Lattner 9995768f47 Fixes for PR114: Thanks to Reid Spencer!
llvm-svn: 10029
2003-11-16 20:21:15 +00:00

315 lines
11 KiB
C++

//===-- llvm/iTerminators.h - Termintator instruction nodes -----*- 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 contains the declarations for all the subclasses of the Instruction
// class which represent "terminator" instructions. Terminator instructions are
// the only instructions allowed and required to terminate a BasicBlock.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ITERMINATORS_H
#define LLVM_ITERMINATORS_H
#include "llvm/InstrTypes.h"
namespace llvm {
//===---------------------------------------------------------------------------
// ReturnInst - Return a value (possibly void), from a function. Execution does
// not continue in this function any longer.
//
class ReturnInst : public TerminatorInst {
ReturnInst(const ReturnInst &RI) : TerminatorInst(Instruction::Ret) {
if (RI.Operands.size()) {
assert(RI.Operands.size() == 1 && "Return insn can only have 1 operand!");
Operands.reserve(1);
Operands.push_back(Use(RI.Operands[0], this));
}
}
public:
ReturnInst(Value *RetVal = 0, Instruction *InsertBefore = 0)
: TerminatorInst(Instruction::Ret, InsertBefore) {
if (RetVal) {
Operands.reserve(1);
Operands.push_back(Use(RetVal, this));
}
}
virtual Instruction *clone() const { return new ReturnInst(*this); }
inline const Value *getReturnValue() const {
return Operands.size() ? Operands[0].get() : 0;
}
inline Value *getReturnValue() {
return Operands.size() ? Operands[0].get() : 0;
}
virtual const BasicBlock *getSuccessor(unsigned idx) const {
assert(0 && "ReturnInst has no successors!");
abort();
return 0;
}
virtual void setSuccessor(unsigned idx, BasicBlock *NewSucc) {
assert(0 && "ReturnInst has no successors!");
}
virtual unsigned getNumSuccessors() const { return 0; }
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ReturnInst *) { return true; }
static inline bool classof(const Instruction *I) {
return (I->getOpcode() == Instruction::Ret);
}
static inline bool classof(const Value *V) {
return isa<Instruction>(V) && classof(cast<Instruction>(V));
}
};
//===---------------------------------------------------------------------------
// BranchInst - Conditional or Unconditional Branch instruction.
//
class BranchInst : public TerminatorInst {
BranchInst(const BranchInst &BI);
public:
// If cond = null, then is an unconditional br...
BranchInst(BasicBlock *IfTrue, BasicBlock *IfFalse, Value *cond = 0,
Instruction *InsertBefore = 0);
BranchInst(BasicBlock *IfTrue, Instruction *InsertBefore = 0);
virtual Instruction *clone() const { return new BranchInst(*this); }
inline bool isUnconditional() const { return Operands.size() == 1; }
inline bool isConditional() const { return Operands.size() == 3; }
inline Value *getCondition() const {
return isUnconditional() ? 0 : reinterpret_cast<Value*>(Operands[2].get());
}
void setCondition(Value *V) {
assert(isConditional() && "Cannot set condition of unconditional branch!");
setOperand(2, V);
}
// setUnconditionalDest - Change the current branch to an unconditional branch
// targeting the specified block.
//
void setUnconditionalDest(BasicBlock *Dest) {
if (isConditional()) Operands.erase(Operands.begin()+1, Operands.end());
Operands[0] = reinterpret_cast<Value*>(Dest);
}
virtual const BasicBlock *getSuccessor(unsigned i) const {
assert(i < getNumSuccessors() && "Successor # out of range for Branch!");
return (i == 0) ? cast<BasicBlock>(Operands[0].get()) :
cast<BasicBlock>(Operands[1].get());
}
inline BasicBlock *getSuccessor(unsigned idx) {
const BranchInst *BI = this;
return const_cast<BasicBlock*>(BI->getSuccessor(idx));
}
virtual void setSuccessor(unsigned idx, BasicBlock *NewSucc) {
assert(idx < getNumSuccessors() && "Successor # out of range for Branch!");
Operands[idx] = reinterpret_cast<Value*>(NewSucc);
}
virtual unsigned getNumSuccessors() const { return 1+isConditional(); }
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const BranchInst *) { return true; }
static inline bool classof(const Instruction *I) {
return (I->getOpcode() == Instruction::Br);
}
static inline bool classof(const Value *V) {
return isa<Instruction>(V) && classof(cast<Instruction>(V));
}
};
//===---------------------------------------------------------------------------
// SwitchInst - Multiway switch
//
class SwitchInst : public TerminatorInst {
// Operand[0] = Value to switch on
// Operand[1] = Default basic block destination
// Operand[2n ] = Value to match
// Operand[2n+1] = BasicBlock to go to on match
SwitchInst(const SwitchInst &RI);
public:
SwitchInst(Value *Value, BasicBlock *Default, Instruction *InsertBefore = 0);
virtual Instruction *clone() const { return new SwitchInst(*this); }
// Accessor Methods for Switch stmt
//
inline const Value *getCondition() const { return Operands[0]; }
inline Value *getCondition() { return Operands[0]; }
inline const BasicBlock *getDefaultDest() const {
return cast<BasicBlock>(Operands[1].get());
}
inline BasicBlock *getDefaultDest() {
return cast<BasicBlock>(Operands[1].get());
}
/// addCase - Add an entry to the switch instruction...
///
void addCase(Constant *OnVal, BasicBlock *Dest);
/// removeCase - This method removes the specified successor from the switch
/// instruction. Note that this cannot be used to remove the default
/// destination (successor #0).
///
void removeCase(unsigned idx);
virtual const BasicBlock *getSuccessor(unsigned idx) const {
assert(idx < getNumSuccessors() &&"Successor idx out of range for switch!");
return cast<BasicBlock>(Operands[idx*2+1].get());
}
inline BasicBlock *getSuccessor(unsigned idx) {
assert(idx < getNumSuccessors() &&"Successor idx out of range for switch!");
return cast<BasicBlock>(Operands[idx*2+1].get());
}
virtual void setSuccessor(unsigned idx, BasicBlock *NewSucc) {
assert(idx < getNumSuccessors() && "Successor # out of range for switch!");
Operands[idx*2+1] = reinterpret_cast<Value*>(NewSucc);
}
// getSuccessorValue - Return the value associated with the specified
// successor.
inline const Constant *getSuccessorValue(unsigned idx) const {
assert(idx < getNumSuccessors() && "Successor # out of range!");
return cast<Constant>(Operands[idx*2].get());
}
inline Constant *getSuccessorValue(unsigned idx) {
assert(idx < getNumSuccessors() && "Successor # out of range!");
return cast<Constant>(Operands[idx*2].get());
}
virtual unsigned getNumSuccessors() const { return Operands.size()/2; }
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SwitchInst *) { return true; }
static inline bool classof(const Instruction *I) {
return (I->getOpcode() == Instruction::Switch);
}
static inline bool classof(const Value *V) {
return isa<Instruction>(V) && classof(cast<Instruction>(V));
}
};
//===---------------------------------------------------------------------------
// InvokeInst - Invoke instruction
//
class InvokeInst : public TerminatorInst {
InvokeInst(const InvokeInst &BI);
public:
InvokeInst(Value *Fn, BasicBlock *IfNormal, BasicBlock *IfException,
const std::vector<Value*> &Params, const std::string &Name = "",
Instruction *InsertBefore = 0);
virtual Instruction *clone() const { return new InvokeInst(*this); }
bool mayWriteToMemory() const { return true; }
/// getCalledFunction - Return the function called, or null if this is an
/// indirect function invocation...
///
/// FIXME: These should be inlined once we get rid of ConstantPointerRefs!
///
const Function *getCalledFunction() const;
Function *getCalledFunction();
// getCalledValue - Get a pointer to a function that is invoked by this inst.
inline const Value *getCalledValue() const { return Operands[0]; }
inline Value *getCalledValue() { return Operands[0]; }
// get*Dest - Return the destination basic blocks...
inline const BasicBlock *getNormalDest() const {
return cast<BasicBlock>(Operands[1].get());
}
inline BasicBlock *getNormalDest() {
return cast<BasicBlock>(Operands[1].get());
}
inline const BasicBlock *getExceptionalDest() const {
return cast<BasicBlock>(Operands[2].get());
}
inline BasicBlock *getExceptionalDest() {
return cast<BasicBlock>(Operands[2].get());
}
inline void setNormalDest(BasicBlock *B){
Operands[1] = reinterpret_cast<Value*>(B);
}
inline void setExceptionalDest(BasicBlock *B){
Operands[2] = reinterpret_cast<Value*>(B);
}
virtual const BasicBlock *getSuccessor(unsigned i) const {
assert(i < 2 && "Successor # out of range for invoke!");
return i == 0 ? getNormalDest() : getExceptionalDest();
}
inline BasicBlock *getSuccessor(unsigned i) {
assert(i < 2 && "Successor # out of range for invoke!");
return i == 0 ? getNormalDest() : getExceptionalDest();
}
virtual void setSuccessor(unsigned idx, BasicBlock *NewSucc) {
assert(idx < 2 && "Successor # out of range for invoke!");
Operands[idx+1] = reinterpret_cast<Value*>(NewSucc);
}
virtual unsigned getNumSuccessors() const { return 2; }
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const InvokeInst *) { return true; }
static inline bool classof(const Instruction *I) {
return (I->getOpcode() == Instruction::Invoke);
}
static inline bool classof(const Value *V) {
return isa<Instruction>(V) && classof(cast<Instruction>(V));
}
};
//===---------------------------------------------------------------------------
/// UnwindInst - Immediately exit the current function, unwinding the stack
/// until an invoke instruction is found.
///
struct UnwindInst : public TerminatorInst {
UnwindInst(Instruction *InsertBefore = 0)
: TerminatorInst(Instruction::Unwind, InsertBefore) {
}
virtual Instruction *clone() const { return new UnwindInst(); }
virtual const BasicBlock *getSuccessor(unsigned idx) const {
assert(0 && "UnwindInst has no successors!");
abort();
return 0;
}
virtual void setSuccessor(unsigned idx, BasicBlock *NewSucc) {
assert(0 && "UnwindInst has no successors!");
}
virtual unsigned getNumSuccessors() const { return 0; }
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const UnwindInst *) { return true; }
static inline bool classof(const Instruction *I) {
return I->getOpcode() == Instruction::Unwind;
}
static inline bool classof(const Value *V) {
return isa<Instruction>(V) && classof(cast<Instruction>(V));
}
};
} // End llvm namespace
#endif