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MCInstOrData.cpp
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MCInstOrData.cpp
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//===-- MCInstOrData.cpp - Binary raiser utility llvm-mctoll --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the implementation of MCInstrOrData class for use by
// llvm-mctoll.
//
//===----------------------------------------------------------------------===//
#include "MCInstOrData.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
MCInstOrData::MCInstOrData(const MCInstOrData &v) {
type = v.type;
switch (v.type) {
case Tag::DATA:
d = v.d;
break;
case Tag::INSTRUCTION:
new (&i) MCInst(v.i);
}
}
MCInstOrData::MCInstOrData(const MCInst &v) {
type = Tag::INSTRUCTION;
new (&i) MCInst(v); // placement new: explicitly construct MCInst
}
MCInstOrData::MCInstOrData(const uint32_t v) {
type = Tag::DATA;
d = v;
}
uint32_t MCInstOrData::get_data() const {
assert(type == Tag::DATA);
return d;
}
MCInst MCInstOrData::get_mcInst() const {
assert(type == Tag::INSTRUCTION);
return i;
}
// This is needed because of user-defined variant MCInst being part of MCInst
MCInstOrData &MCInstOrData::operator=(const MCInstOrData &e) {
if (type == Tag::INSTRUCTION && e.type == Tag::INSTRUCTION) {
i = e.i; // Usual MCInst assignment
return *this;
}
if (type == Tag::INSTRUCTION)
i.~MCInst(); // Explicit destroy
switch (e.type) {
case Tag::DATA:
d = e.d;
break;
case Tag::INSTRUCTION:
new (&i) MCInst(e.i);
type = e.type;
}
return *this;
}
void MCInstOrData::dump() const {
switch (type) {
case Tag::DATA:
outs() << "0x" << format("%04" PRIx16, d) << "\n";
break;
case Tag::INSTRUCTION:
i.dump();
break;
}
}
MCInstOrData::~MCInstOrData() {
if (type == Tag::INSTRUCTION)
i.~MCInst(); // explicit destroy
}