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