The Tor Browser / file comparison
comparison: js/src/jit/BytecodeAnalysis.h
js/src/jit/BytecodeAnalysis.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:73ae4d33aeb7 |
|---|---|
| 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/. */ | |
| 6 | |
| 7 #ifndef jit_BytecodeAnalysis_h | |
| 8 #define jit_BytecodeAnalysis_h | |
| 9 | |
| 10 #include "jsscript.h" | |
| 11 #include "jit/IonAllocPolicy.h" | |
| 12 #include "js/Vector.h" | |
| 13 | |
| 14 namespace js { | |
| 15 namespace jit { | |
| 16 | |
| 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; | |
| 26 | |
| 27 // If true, this is a JSOP_LOOPENTRY op inside a catch or finally block. | |
| 28 bool loopEntryInCatchOrFinally : 1; | |
| 29 | |
| 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 }; | |
| 37 | |
| 38 class BytecodeAnalysis | |
| 39 { | |
| 40 JSScript *script_; | |
| 41 Vector<BytecodeInfo, 0, IonAllocPolicy> infos_; | |
| 42 | |
| 43 bool usesScopeChain_; | |
| 44 bool hasTryFinally_; | |
| 45 bool hasSetArg_; | |
| 46 | |
| 47 public: | |
| 48 explicit BytecodeAnalysis(TempAllocator &alloc, JSScript *script); | |
| 49 | |
| 50 bool init(TempAllocator &alloc, GSNCache &gsn); | |
| 51 | |
| 52 BytecodeInfo &info(jsbytecode *pc) { | |
| 53 JS_ASSERT(infos_[script_->pcToOffset(pc)].initialized); | |
| 54 return infos_[script_->pcToOffset(pc)]; | |
| 55 } | |
| 56 | |
| 57 BytecodeInfo *maybeInfo(jsbytecode *pc) { | |
| 58 if (infos_[script_->pcToOffset(pc)].initialized) | |
| 59 return &infos_[script_->pcToOffset(pc)]; | |
| 60 return nullptr; | |
| 61 } | |
| 62 | |
| 63 bool usesScopeChain() const { | |
| 64 return usesScopeChain_; | |
| 65 } | |
| 66 | |
| 67 bool hasTryFinally() const { | |
| 68 return hasTryFinally_; | |
| 69 } | |
| 70 | |
| 71 bool hasSetArg() const { | |
| 72 return hasSetArg_; | |
| 73 } | |
| 74 }; | |
| 75 | |
| 76 | |
| 77 } // namespace jit | |
| 78 } // namespace js | |
| 79 | |
| 80 #endif /* jit_BytecodeAnalysis_h */ |
