zerny@google.com
798b5652a8
Needed so the SSA renaming environment does not contribute uses in the use list. R=kmillikin@google.com BUG= Review URL: https://chromiumcodereview.appspot.com//10857056 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@10894 260f80e4-7a28-3924-810f-c04153c831b5
117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_FLOW_GRAPH_H_
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#define VM_FLOW_GRAPH_H_
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#include "vm/growable_array.h"
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#include "vm/parser.h"
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namespace dart {
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class BlockEntryInstr;
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class Definition;
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class FlowGraphBuilder;
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class GraphEntryInstr;
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class PhiInstr;
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// Class to incapsulate the construction and manipulation of the flow graph.
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class FlowGraph: public ZoneAllocated {
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public:
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FlowGraph(const FlowGraphBuilder& builder, GraphEntryInstr* graph_entry);
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// Function properties.
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const ParsedFunction& parsed_function() const {
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return parsed_function_;
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}
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intptr_t parameter_count() const {
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return copied_parameter_count_ + non_copied_parameter_count_;
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}
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intptr_t variable_count() const {
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return parameter_count() + stack_local_count_;
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}
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intptr_t stack_local_count() const {
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return stack_local_count_;
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}
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intptr_t copied_parameter_count() const {
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return copied_parameter_count_;
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}
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intptr_t non_copied_parameter_count() const {
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return non_copied_parameter_count_;
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}
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// Flow graph orders.
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const GrowableArray<BlockEntryInstr*>& preorder() const {
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return preorder_;
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}
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const GrowableArray<BlockEntryInstr*>& postorder() const {
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return postorder_;
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}
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const GrowableArray<BlockEntryInstr*>& reverse_postorder() const {
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return reverse_postorder_;
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}
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intptr_t max_virtual_register_number() const {
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return current_ssa_temp_index();
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}
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// Operations on the flow graph.
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void ComputeSSA();
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// TODO(zerny): Once the SSA is feature complete this should be removed.
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void Bailout(const char* reason) const;
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private:
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void DiscoverBlocks();
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// SSA transformation methods and fields.
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void ComputeDominators(
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GrowableArray<BlockEntryInstr*>* preorder,
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GrowableArray<intptr_t>* parent,
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GrowableArray<BitVector*>* dominance_frontier);
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void CompressPath(
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intptr_t start_index,
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intptr_t current_index,
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GrowableArray<intptr_t>* parent,
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GrowableArray<intptr_t>* label);
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void Rename(GrowableArray<PhiInstr*>* live_phis);
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void RenameRecursive(
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BlockEntryInstr* block_entry,
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GrowableArray<Definition*>* env,
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GrowableArray<PhiInstr*>* live_phis);
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void InsertPhis(
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const GrowableArray<BlockEntryInstr*>& preorder,
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const GrowableArray<BitVector*>& assigned_vars,
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const GrowableArray<BitVector*>& dom_frontier);
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void MarkLivePhis(GrowableArray<PhiInstr*>* live_phis);
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intptr_t current_ssa_temp_index() const { return current_ssa_temp_index_; }
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intptr_t alloc_ssa_temp_index() { return current_ssa_temp_index_++; }
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// DiscoverBlocks computes parent_ and assigned_vars_ which are then used
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// if/when computing SSA.
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GrowableArray<intptr_t> parent_;
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GrowableArray<BitVector*> assigned_vars_;
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intptr_t current_ssa_temp_index_;
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// Flow graph fields.
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const ParsedFunction& parsed_function_;
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const intptr_t copied_parameter_count_;
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const intptr_t non_copied_parameter_count_;
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const intptr_t stack_local_count_;
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GraphEntryInstr* graph_entry_;
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GrowableArray<BlockEntryInstr*> preorder_;
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GrowableArray<BlockEntryInstr*> postorder_;
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GrowableArray<BlockEntryInstr*> reverse_postorder_;
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};
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} // namespace dart
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#endif // VM_FLOW_GRAPH_H_
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