void IRInstruction::convertToMov() {
assert(!isControlFlow());
m_op = Mov;
m_typeParam = Type::None;
assert(m_numSrcs == 1);
assert(m_numDsts == 1);
}
void IRInstruction::convertToMov() {
assert(!isControlFlow());
m_op = Mov;
m_typeParam = Type::None;
m_extra = nullptr;
assert(m_numSrcs == 1);
// Instructions in the simplifier don't have dests yet
assert((m_numDsts == 1) != isTransient());
}
void IRInstruction::convertToMov() {
assert(!isControlFlow());
m_op = Mov;
m_typeParam.clear();
m_extra = nullptr;
if (m_numDsts == 1) m_dst->setInstruction(this); // recompute type
assert(m_numSrcs == 1);
// Instructions in the simplifier don't have dests yet
assert((m_numDsts == 1) != isTransient());
}
void IRInstruction::convertToJmp() {
assert(isControlFlow());
assert(IMPLIES(block(), block()->back() == this));
m_op = Jmp_;
m_typeParam = Type::None;
m_numSrcs = 0;
m_numDsts = 0;
m_srcs = nullptr;
m_dst = nullptr;
// Instructions in the simplifier don't have blocks yet.
if (block()) block()->setNext(nullptr);
}
void IRInstruction::convertToJmp() {
assert(isControlFlow());
assert(IMPLIES(block(), &block()->back() == this));
m_op = Jmp;
m_typeParam.clear();
m_numSrcs = 0;
m_numDsts = 0;
m_srcs = nullptr;
m_dst = nullptr;
m_extra = nullptr;
// Instructions in the simplifier don't have blocks yet.
setNext(nullptr);
}
void cloneToBlock(const BlockList& rpoBlocks,
IRUnit& unit,
Block::iterator const first,
Block::iterator const last,
Block* const target) {
StateVector<SSATmp,SSATmp*> rewriteMap(unit, nullptr);
auto rewriteSources = [&] (IRInstruction* inst) {
for (int i = 0; i < inst->numSrcs(); ++i) {
if (auto newTmp = rewriteMap[inst->src(i)]) {
FTRACE(5, " rewrite: {} -> {}\n",
inst->src(i)->toString(),
newTmp->toString());
inst->setSrc(i, newTmp);
}
}
};
auto targetIt = target->skipHeader();
for (auto it = first; it != last; ++it) {
assert(!it->isControlFlow());
FTRACE(5, "cloneToBlock({}): {}\n", target->id(), it->toString());
auto const newInst = unit.cloneInstruction(&*it);
if (auto const numDests = newInst->numDsts()) {
for (int i = 0; i < numDests; ++i) {
FTRACE(5, " add rewrite: {} -> {}\n",
it->dst(i)->toString(),
newInst->dst(i)->toString());
rewriteMap[it->dst(i)] = newInst->dst(i);
}
}
target->insert(targetIt, newInst);
targetIt = ++target->iteratorTo(newInst);
}
postorderWalk(
unit,
[&](Block* block) {
FTRACE(5, "cloneToBlock: rewriting block {}\n", block->id());
for (auto& inst : *block) {
FTRACE(5, " rewriting {}\n", inst.toString());
rewriteSources(&inst);
}
},
target
);
}
void cloneToBlock(const BlockList& rpoBlocks,
IRFactory* const irFactory,
Block::iterator const first,
Block::iterator const last,
Block* const target) {
assert(isRPOSorted(rpoBlocks));
StateVector<SSATmp,SSATmp*> rewriteMap(irFactory, nullptr);
auto rewriteSources = [&] (IRInstruction* inst) {
for (int i = 0; i < inst->numSrcs(); ++i) {
if (auto newTmp = rewriteMap[inst->src(i)]) {
FTRACE(5, " rewrite: {} -> {}\n",
inst->src(i)->toString(),
newTmp->toString());
inst->setSrc(i, newTmp);
}
}
};
auto targetIt = target->skipHeader();
for (auto it = first; it != last; ++it) {
assert(!it->isControlFlow());
FTRACE(5, "cloneToBlock({}): {}\n", target->id(), it->toString());
auto const newInst = irFactory->cloneInstruction(&*it);
if (auto const numDests = newInst->numDsts()) {
for (int i = 0; i < numDests; ++i) {
FTRACE(5, " add rewrite: {} -> {}\n",
it->dst(i)->toString(),
newInst->dst(i)->toString());
rewriteMap[it->dst(i)] = newInst->dst(i);
}
}
target->insert(targetIt, newInst);
targetIt = ++target->iteratorTo(newInst);
}
auto it = rpoIteratorTo(rpoBlocks, target);
for (; it != rpoBlocks.end(); ++it) {
FTRACE(5, "cloneToBlock: rewriting block {}\n", (*it)->id());
for (auto& inst : **it) {
FTRACE(5, " rewriting {}\n", inst.toString());
rewriteSources(&inst);
}
}
}
bool IRInstruction::isEssential() const {
Opcode opc = op();
if (opc == DecRefNZ) {
// If the source of a DecRefNZ is not an IncRef, mark it as essential
// because we won't remove its source as well as itself.
// If the ref count optimization is turned off, mark all DecRefNZ as
// essential.
if (!RuntimeOption::EvalHHIREnableRefCountOpt ||
src(0)->inst()->op() != IncRef) {
return true;
}
}
return isControlFlow() ||
opcodeHasFlags(opc, Essential) ||
mayReenterHelper();
}
bool IRInstruction::mayModifyRefs() const {
Opcode opc = op();
// DecRefNZ does not have side effects other than decrementing the ref
// count. Therefore, its MayModifyRefs should be false.
if (opc == DecRef) {
auto type = src(0)->type();
if (isControlFlow()) {
// If the decref has a target label, then it exits if the destructor
// has to be called, so it does not have any side effects on the main
// trace.
return false;
}
if (!type.canRunDtor()) {
return false;
}
}
return opcodeHasFlags(opc, MayModifyRefs) || mayReenterHelper();
}
void moveToBlock(Block::iterator const first,
Block::iterator const last,
Block* const target) {
if (first == last) return;
auto const srcBlock = first->block();
auto targetIt = target->skipHeader();
for (auto it = first; it != last;) {
auto const inst = &*it;
assert(!inst->isControlFlow());
FTRACE(5, "moveToBlock({}): {}\n",
target->id(),
inst->toString());
it = srcBlock->erase(it);
target->insert(targetIt, inst);
targetIt = ++target->iteratorTo(inst);
}
}
bool IRInstruction::isEssential() const {
return isControlFlow() ||
opcodeHasFlags(op(), Essential);
}