69 lines
2 KiB
C++
69 lines
2 KiB
C++
#include <magic/support/VariableRefs.h>
|
|
|
|
using namespace llvm;
|
|
|
|
namespace llvm {
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Constructors, destructor, and operators
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
VariableRefs::VariableRefs() {
|
|
clear();
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Getters
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
bool VariableRefs::isUnnecessaryInstruction(Instruction* inst) const {
|
|
//have already instruction in the entry block, skip
|
|
if(instructionInEntryBlock) {
|
|
return true;
|
|
}
|
|
//have already instruction in the same block, skip
|
|
if(instruction && inst->getParent() == instruction->getParent()) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
Instruction* VariableRefs::getInstruction() const {
|
|
return instruction;
|
|
}
|
|
|
|
bool VariableRefs::isInstructionInEntryBlock() const {
|
|
return instructionInEntryBlock;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Other public methods
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void VariableRefs::addInstruction(Instruction* inst) {
|
|
//no instruction yet, update instruction
|
|
if(!instruction) {
|
|
instruction = inst;
|
|
return;
|
|
}
|
|
//have already instruction in another block, give up and resort to a single instruction in the entry block
|
|
setFunctionEntryInstruction(inst->getParent()->getParent());
|
|
}
|
|
|
|
void VariableRefs::clear() {
|
|
instruction = NULL;
|
|
instructionInEntryBlock = false;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Private methods
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void VariableRefs::setFunctionEntryInstruction(Function* function) {
|
|
this->instruction = function->front().getFirstNonPHI();
|
|
this->instructionInEntryBlock = true;
|
|
}
|
|
|
|
}
|