From 6882a04fb36642862b11efe514251d32070c3d65 Mon Sep 17 00:00:00 2001 From: Konstantin Tokarev Date: Thu, 25 Aug 2016 19:20:41 +0300 Subject: Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443) Change-Id: I3b1d8a2808782c9f34d50240000e20cb38d3680f Reviewed-by: Konstantin Tokarev --- .../dfg/DFGLoopPreHeaderCreationPhase.h | 59 ++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 Source/JavaScriptCore/dfg/DFGLoopPreHeaderCreationPhase.h (limited to 'Source/JavaScriptCore/dfg/DFGLoopPreHeaderCreationPhase.h') diff --git a/Source/JavaScriptCore/dfg/DFGLoopPreHeaderCreationPhase.h b/Source/JavaScriptCore/dfg/DFGLoopPreHeaderCreationPhase.h new file mode 100644 index 000000000..bdd62167d --- /dev/null +++ b/Source/JavaScriptCore/dfg/DFGLoopPreHeaderCreationPhase.h @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2013 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef DFGLoopPreHeaderCreationPhase_h +#define DFGLoopPreHeaderCreationPhase_h + +#if ENABLE(DFG_JIT) + +namespace JSC { namespace DFG { + +class BlockInsertionSet; +class Graph; +struct BasicBlock; + +// Inserts dummy basic blocks before any loop headers that don't already have +// a single non-loop predecessor. + +bool performLoopPreHeaderCreation(Graph&); + +// Creates a new basic block (a pre-header) that jumps to the given block. All +// predecessors of the given block that aren't dominated by it are rerouted to +// the pre-header. +// +// This function is used internally and it's used in a surgical fashion by +// OSREntrypointCreationPhase. +// +// Note that executing this function requires having an intact dominators +// analysis. You should run that analysis before doing damage to the CFG, even +// if said damage is done before you call this. +BasicBlock* createPreHeader(Graph&, BlockInsertionSet&, BasicBlock*); + +} } // namespace JSC::DFG + +#endif // ENABLE(DFG_JIT) + +#endif // DFGLoopPreHeaderCreationPhase_h + -- cgit v1.2.1