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// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/compiler/scheduled-machine-lowering.h"
#include "src/compiler/compiler-source-position-table.h"
#include "src/compiler/js-graph.h"
#include "src/compiler/node-origin-table.h"
#include "src/compiler/node-properties.h"
#include "src/compiler/schedule.h"
namespace v8 {
namespace internal {
namespace compiler {
ScheduledMachineLowering::ScheduledMachineLowering(
JSGraph* js_graph, Schedule* schedule, Zone* temp_zone,
SourcePositionTable* source_positions, NodeOriginTable* node_origins,
PoisoningMitigationLevel poison_level)
: schedule_(schedule),
graph_assembler_(js_graph, temp_zone, schedule),
select_lowering_(&graph_assembler_, js_graph->graph()),
memory_lowering_(js_graph, temp_zone, &graph_assembler_, poison_level),
reducers_({&select_lowering_, &memory_lowering_}, temp_zone),
source_positions_(source_positions),
node_origins_(node_origins) {}
void ScheduledMachineLowering::Run() {
// TODO(rmcilroy) We should not depend on having rpo_order on schedule, and
// instead just do our own RPO walk here.
for (BasicBlock* block : *(schedule()->rpo_order())) {
BasicBlock::iterator instr = block->begin();
BasicBlock::iterator end_instr = block->end();
gasm()->Reset(block);
for (; instr != end_instr; instr++) {
Node* node = *instr;
Reduction reduction;
for (auto reducer : reducers_) {
reduction = reducer->Reduce(node);
if (reduction.Changed()) break;
}
if (reduction.Changed()) {
Node* replacement = reduction.replacement();
if (replacement != node) {
// Replace all uses of node and kill the node to make sure we don't
// leave dangling dead uses.
NodeProperties::ReplaceUses(node, replacement, gasm()->effect(),
gasm()->control());
node->Kill();
} else {
gasm()->AddNode(replacement);
}
} else {
gasm()->AddNode(node);
}
}
gasm()->FinalizeCurrentBlock(block);
}
schedule_->rpo_order()->clear();
}
} // namespace compiler
} // namespace internal
} // namespace v8
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