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3aaa812969
* Add new constructors to allow insertion of terminator instructions at the end of basic blocks. * Move a ReturnInst method out-of-line, so that the vtable and type info don't need to be emitted to every translation unit that uses the class. llvm-svn: 10107
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
//===-- iSwitch.cpp - Implement the Switch instruction --------------------===//
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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 implements the Switch instruction...
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/iTerminators.h"
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#include "llvm/BasicBlock.h"
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using namespace llvm;
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SwitchInst::SwitchInst(Value *V, BasicBlock *DefaultDest,
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Instruction *InsertBefore)
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: TerminatorInst(Instruction::Switch, InsertBefore) {
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assert(V && DefaultDest);
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Operands.push_back(Use(V, this));
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Operands.push_back(Use(DefaultDest, this));
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}
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SwitchInst::SwitchInst(Value *V, BasicBlock *DefaultDest,
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BasicBlock *InsertAtEnd)
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: TerminatorInst(Instruction::Switch, InsertAtEnd) {
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assert(V && DefaultDest);
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Operands.push_back(Use(V, this));
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Operands.push_back(Use(DefaultDest, this));
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}
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SwitchInst::SwitchInst(const SwitchInst &SI)
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: TerminatorInst(Instruction::Switch) {
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Operands.reserve(SI.Operands.size());
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for (unsigned i = 0, E = SI.Operands.size(); i != E; i+=2) {
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Operands.push_back(Use(SI.Operands[i], this));
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Operands.push_back(Use(SI.Operands[i+1], this));
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}
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}
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/// addCase - Add an entry to the switch instruction...
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///
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void SwitchInst::addCase(Constant *OnVal, BasicBlock *Dest) {
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Operands.push_back(Use((Value*)OnVal, this));
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Operands.push_back(Use((Value*)Dest, this));
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}
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/// removeCase - This method removes the specified successor from the switch
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/// instruction. Note that this cannot be used to remove the default
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/// destination (successor #0).
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///
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void SwitchInst::removeCase(unsigned idx) {
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assert(idx != 0 && "Cannot remove the default case!");
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assert(idx*2 < Operands.size() && "Successor index out of range!!!");
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Operands.erase(Operands.begin()+idx*2, Operands.begin()+(idx+1)*2);
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}
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