063fc25122
R=jochen@chromium.org Review URL: https://codereview.chromium.org/1088993003 Cr-Commit-Position: refs/heads/master@{#27937}
65 lines
1.7 KiB
C++
65 lines
1.7 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_ARM_LITHIUM_GAP_RESOLVER_ARM_H_
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#define V8_ARM_LITHIUM_GAP_RESOLVER_ARM_H_
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#include "src/v8.h"
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#include "src/lithium.h"
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namespace v8 {
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namespace internal {
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class LCodeGen;
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class LGapResolver;
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class LGapResolver final BASE_EMBEDDED {
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public:
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explicit LGapResolver(LCodeGen* owner);
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// Resolve a set of parallel moves, emitting assembler instructions.
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void Resolve(LParallelMove* parallel_move);
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private:
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// Build the initial list of moves.
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void BuildInitialMoveList(LParallelMove* parallel_move);
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// Perform the move at the moves_ index in question (possibly requiring
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// other moves to satisfy dependencies).
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void PerformMove(int index);
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// If a cycle is found in the series of moves, save the blocking value to
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// a scratch register. The cycle must be found by hitting the root of the
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// depth-first search.
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void BreakCycle(int index);
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// After a cycle has been resolved, restore the value from the scratch
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// register to its proper destination.
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void RestoreValue();
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// Emit a move and remove it from the move graph.
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void EmitMove(int index);
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// Verify the move list before performing moves.
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void Verify();
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LCodeGen* cgen_;
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// List of moves not yet resolved.
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ZoneList<LMoveOperands> moves_;
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int root_index_;
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bool in_cycle_;
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LOperand* saved_destination_;
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// We use the root register as a scratch in a few places. When that happens,
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// this flag is set to indicate that it needs to be restored.
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bool need_to_restore_root_;
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};
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} } // namespace v8::internal
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#endif // V8_ARM_LITHIUM_GAP_RESOLVER_ARM_H_
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