llvm-6502/include/llvm/iTerminators.h

398 lines
14 KiB
C
Raw Normal View History

//===-- 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));
}
}
void init(Value *RetVal) {
if (RetVal) {
Operands.reserve(1);
Operands.push_back(Use(RetVal, this));
}
}
public:
// ReturnInst constructors:
// ReturnInst() - 'ret void' instruction
// ReturnInst(Value* X) - 'ret X' instruction
// ReturnInst( null, Inst *) - 'ret void' instruction, insert before I
// ReturnInst(Value* X, Inst *I) - 'ret X' instruction, insert before I
// ReturnInst( null, BB *B) - 'ret void' instruction, insert @ end of BB
// ReturnInst(Value* X, BB *B) - 'ret X' instruction, insert @ end of BB
ReturnInst(Value *RetVal = 0, Instruction *InsertBefore = 0)
: TerminatorInst(Instruction::Ret, InsertBefore) {
init(RetVal);
}
ReturnInst(Value *RetVal, BasicBlock *InsertAtEnd)
: TerminatorInst(Instruction::Ret, InsertAtEnd) {
init(RetVal);
}
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);
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);
void init(BasicBlock *IfTrue);
void init(BasicBlock *True, BasicBlock *False, Value *Cond);
public:
// BranchInst constructors (where {B, T, F} are blocks, and C is a condition):
// BranchInst(BB *B) - 'br B'
// BranchInst(BB* T, BB *F, Value *C) - 'br C, T, F'
// BranchInst(BB* B, Inst *I) - 'br B' insert before I
// BranchInst(BB* T, BB *F, Value *C, Inst *I) - 'br C, T, F', insert before I
// BranchInst(BB* B, BB *I) - 'br B' insert at end
// BranchInst(BB* T, BB *F, Value *C, BB *I) - 'br C, T, F', insert at end
BranchInst(BasicBlock *IfTrue, Instruction *InsertBefore = 0)
: TerminatorInst(Instruction::Br, InsertBefore) {
init(IfTrue);
}
BranchInst(BasicBlock *IfTrue, BasicBlock *IfFalse, Value *Cond,
Instruction *InsertBefore = 0)
: TerminatorInst(Instruction::Br, InsertBefore) {
init(IfTrue, IfFalse, Cond);
}
BranchInst(BasicBlock *IfTrue, BasicBlock *InsertAtEnd)
: TerminatorInst(Instruction::Br, InsertAtEnd) {
init(IfTrue);
}
BranchInst(BasicBlock *IfTrue, BasicBlock *IfFalse, Value *Cond,
BasicBlock *InsertAtEnd)
: TerminatorInst(Instruction::Br, InsertAtEnd) {
init(IfTrue, IfFalse, Cond);
}
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);
void init(Value *Value, BasicBlock *Default);
public:
SwitchInst(Value *Value, BasicBlock *Default, Instruction *InsertBefore = 0)
: TerminatorInst(Instruction::Switch, InsertBefore) {
init(Value, Default);
}
SwitchInst(Value *Value, BasicBlock *Default, BasicBlock *InsertAtEnd)
: TerminatorInst(Instruction::Switch, InsertAtEnd) {
init(Value, Default);
}
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());
}
/// getNumCases - return the number of 'cases' in this switch instruction.
/// Note that case #0 is always the default case.
unsigned getNumCases() const {
return Operands.size()/2;
}
/// getCaseValue - Return the specified case value. Note that case #0, the
/// default destination, does not have a case value.
Constant *getCaseValue(unsigned i) {
assert(i && i < getNumCases() && "Illegal case value to get!");
return getSuccessorValue(i);
}
/// getCaseValue - Return the specified case value. Note that case #0, the
/// default destination, does not have a case value.
const Constant *getCaseValue(unsigned i) const {
assert(i && i < getNumCases() && "Illegal case value to get!");
return getSuccessorValue(i);
}
/// findCaseValue - Search all of the case values for the specified constant.
/// If it is explicitly handled, return the case number of it, otherwise
/// return 0 to indicate that it is handled by the default handler.
unsigned findCaseValue(const Constant *C) const {
for (unsigned i = 1, e = getNumCases(); i != e; ++i)
if (getCaseValue(i) == C)
return i;
return 0;
}
/// 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);
void init(Value *Fn, BasicBlock *IfNormal, BasicBlock *IfException,
const std::vector<Value*> &Params);
public:
InvokeInst(Value *Fn, BasicBlock *IfNormal, BasicBlock *IfException,
const std::vector<Value*> &Params, const std::string &Name = "",
Instruction *InsertBefore = 0);
InvokeInst(Value *Fn, BasicBlock *IfNormal, BasicBlock *IfException,
const std::vector<Value*> &Params, const std::string &Name,
BasicBlock *InsertAtEnd);
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 *getUnwindDest() const {
return cast<BasicBlock>(Operands[2].get());
}
inline BasicBlock *getUnwindDest() {
return cast<BasicBlock>(Operands[2].get());
}
inline void setNormalDest(BasicBlock *B){
Operands[1] = reinterpret_cast<Value*>(B);
}
inline void setUnwindDest(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() : getUnwindDest();
}
inline BasicBlock *getSuccessor(unsigned i) {
assert(i < 2 && "Successor # out of range for invoke!");
return i == 0 ? getNormalDest() : getUnwindDest();
}
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) {
}
UnwindInst(BasicBlock *InsertAtEnd)
: TerminatorInst(Instruction::Unwind, InsertAtEnd) {
}
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);
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