The Tor Browser: js/src/jit/BytecodeAnalysis.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef jit_BytecodeAnalysis_h

     8 #define jit_BytecodeAnalysis_h

    10 #include "jsscript.h"

    11 #include "jit/IonAllocPolicy.h"

    12 #include "js/Vector.h"

    14 namespace js {

    15 namespace jit {

    17 // Basic information about bytecodes in the script.  Used to help baseline compilation.

    18 struct BytecodeInfo

    19 {

    20     static const uint16_t MAX_STACK_DEPTH = 0xffffU;

    21     uint16_t stackDepth;

    22     bool initialized : 1;

    23     bool jumpTarget : 1;

    24     bool jumpFallthrough : 1;

    25     bool fallthrough : 1;

    27     // If true, this is a JSOP_LOOPENTRY op inside a catch or finally block.

    28     bool loopEntryInCatchOrFinally : 1;

    30     void init(unsigned depth) {

    31         JS_ASSERT(depth <= MAX_STACK_DEPTH);

    32         JS_ASSERT_IF(initialized, stackDepth == depth);

    33         initialized = true;

    34         stackDepth = depth;

    35     }

    36 };

    38 class BytecodeAnalysis

    39 {

    40     JSScript *script_;

    41     Vector<BytecodeInfo, 0, IonAllocPolicy> infos_;

    43     bool usesScopeChain_;

    44     bool hasTryFinally_;

    45     bool hasSetArg_;

    47   public:

    48     explicit BytecodeAnalysis(TempAllocator &alloc, JSScript *script);

    50     bool init(TempAllocator &alloc, GSNCache &gsn);

    52     BytecodeInfo &info(jsbytecode *pc) {

    53         JS_ASSERT(infos_[script_->pcToOffset(pc)].initialized);

    54         return infos_[script_->pcToOffset(pc)];

    55     }

    57     BytecodeInfo *maybeInfo(jsbytecode *pc) {

    58         if (infos_[script_->pcToOffset(pc)].initialized)

    59             return &infos_[script_->pcToOffset(pc)];

    60         return nullptr;

    61     }

    63     bool usesScopeChain() const {

    64         return usesScopeChain_;

    65     }

    67     bool hasTryFinally() const {

    68         return hasTryFinally_;

    69     }

    71     bool hasSetArg() const {

    72         return hasSetArg_;

    73     }

    74 };

    77 } // namespace jit

    78 } // namespace js

    80 #endif /* jit_BytecodeAnalysis_h */

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