vegorov@google.com
30288c500e
R=fschneider@google.com BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//10657044 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@9106 260f80e4-7a28-3924-810f-c04153c831b5
71 lines
2.3 KiB
C++
71 lines
2.3 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_ALLOCATOR_H_
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#define VM_FLOW_GRAPH_ALLOCATOR_H_
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#include "vm/growable_array.h"
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#include "vm/intermediate_language.h"
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namespace dart {
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class FlowGraphAllocator : public ValueObject {
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public:
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FlowGraphAllocator(const GrowableArray<BlockEntryInstr*>& postorder,
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intptr_t max_ssa_temp_index);
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void ResolveConstraints();
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// Build live-in and live-out sets for each block.
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void AnalyzeLiveness();
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private:
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// Compute initial values for live-out, kill and live-in sets.
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void ComputeInitialSets();
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// Update live-out set for the given block: live-out should contain
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// all values that are live-in for block's successors.
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// Returns true if live-out set was changed.
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bool UpdateLiveOut(BlockEntryInstr* instr);
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// Update live-in set for the given block: live-in should contain
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// all values taht are live-out from the block and are not defined
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// by this block.
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// Returns true if live-in set was changed.
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bool UpdateLiveIn(BlockEntryInstr* instr);
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// Perform fix-point iteration updating live-out and live-in sets
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// for blocks until they stop changing.
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void ComputeLiveInAndLiveOutSets();
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// Print results of liveness analysis.
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void DumpLiveness();
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// Live-out sets for each block. They contain indices of SSA values
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// that are live out from this block: that is values that were either
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// defined in this block or live into it and that are used in some
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// successor block.
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GrowableArray<BitVector*> live_out_;
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// Kill sets for each block. They contain indices of SSA values that
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// are defined by this block.
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GrowableArray<BitVector*> kill_;
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// Live-in sets for each block. They contain indices of SSA values
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// that are used by this block or its successors.
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GrowableArray<BitVector*> live_in_;
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const GrowableArray<BlockEntryInstr*>& postorder_;
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// Number of virtual registers. Currently equal to the number of
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// SSA values.
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const intptr_t vreg_count_;
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DISALLOW_COPY_AND_ASSIGN(FlowGraphAllocator);
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};
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} // namespace dart
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#endif // VM_FLOW_GRAPH_ALLOCATOR_H_
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