dfg/DFGCommonData.h

   1 /*
   2  * Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef DFGCommonData_h
  27 #define DFGCommonData_h
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include "CodeBlockJettisoningWatchpoint.h"
  32 #include "DFGJumpReplacement.h"
  33 #include "InlineCallFrameSet.h"
  34 #include "JSCell.h"
  35 #include "ProfilerCompilation.h"
  36 #include "SymbolTable.h"
  37 #include <wtf/Bag.h>
  38 #include <wtf/Noncopyable.h>
  39
  40 namespace JSC {
  41
  42 class CodeBlock;
  43 class Identifier;
  44 class TrackedReferences;
  45
  46 namespace DFG {
  47
  48 struct Node;
  49 struct Plan;
  50
  51 // CommonData holds the set of data that both DFG and FTL code blocks need to know
  52 // about themselves.
  53
  54 struct WeakReferenceTransition {
  55     WeakReferenceTransition() { }
  56
  57     WeakReferenceTransition(VM& vm, JSCell* owner, JSCell* codeOrigin, JSCell* from, JSCell* to)
  58         : m_from(vm, owner, from)
  59         , m_to(vm, owner, to)
  60     {
  61         if (!!codeOrigin)
  62             m_codeOrigin.set(vm, owner, codeOrigin);
  63     }
  64
  65     WriteBarrier<JSCell> m_codeOrigin;
  66     WriteBarrier<JSCell> m_from;
  67     WriteBarrier<JSCell> m_to;
  68 };
  69
  70 class CommonData {
  71     WTF_MAKE_NONCOPYABLE(CommonData);
  72 public:
  73     CommonData()
  74         : isStillValid(true)
  75         , frameRegisterCount(std::numeric_limits<unsigned>::max())
  76         , requiredRegisterCountForExit(std::numeric_limits<unsigned>::max())
  77     { }
  78
  79     void notifyCompilingStructureTransition(Plan&, CodeBlock*, Node*);
  80     unsigned addCodeOrigin(CodeOrigin);
  81
  82     void shrinkToFit();
  83
  84     bool invalidate(); // Returns true if we did invalidate, or false if the code block was already invalidated.
  85
  86     unsigned requiredRegisterCountForExecutionAndExit() const
  87     {
  88         return std::max(frameRegisterCount, requiredRegisterCountForExit);
  89     }
  90
  91     void validateReferences(const TrackedReferences&);
  92
  93     RefPtr<InlineCallFrameSet> inlineCallFrames;
  94     Vector<CodeOrigin, 0, UnsafeVectorOverflow> codeOrigins;
  95
  96     Vector<Identifier> dfgIdentifiers;
  97     Vector<WeakReferenceTransition> transitions;
  98     Vector<WriteBarrier<JSCell>> weakReferences;
  99     Vector<WriteBarrier<Structure>> weakStructureReferences;
 100     SegmentedVector<CodeBlockJettisoningWatchpoint, 1> watchpoints;
 101     Vector<JumpReplacement> jumpReplacements;
 102
 103     RefPtr<Profiler::Compilation> compilation;
 104     bool livenessHasBeenProved; // Initialized and used on every GC.
 105     bool allTransitionsHaveBeenMarked; // Initialized and used on every GC.
 106     bool isStillValid;
 107
 108 #if USE(JSVALUE32_64)
 109     std::unique_ptr<Bag<double>> doubleConstants;
 110 #endif
 111
 112     unsigned frameRegisterCount;
 113     unsigned requiredRegisterCountForExit;
 114 };
 115
 116 } } // namespace JSC::DFG
 117
 118 #endif // ENABLE(DFG_JIT)
 119
 120 #endif // DFGCommonData_h
 121