The Tor Browser: js/src/jit/MIRGenerator.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_MIRGenerator_h

     8 #define jit_MIRGenerator_h

    10 // This file declares the data structures used to build a control-flow graph

    11 // containing MIR.

    13 #include "mozilla/Atomics.h"

    15 #include <stdarg.h>

    17 #include "jscntxt.h"

    18 #include "jscompartment.h"

    20 #include "jit/CompileInfo.h"

    21 #include "jit/IonAllocPolicy.h"

    22 #include "jit/JitCompartment.h"

    23 #ifdef JS_ION_PERF

    24 # include "jit/PerfSpewer.h"

    25 #endif

    26 #include "jit/RegisterSets.h"

    28 namespace js {

    29 namespace jit {

    31 class MBasicBlock;

    32 class MIRGraph;

    33 class MStart;

    34 class OptimizationInfo;

    36 class MIRGenerator

    37 {

    38   public:

    39     MIRGenerator(CompileCompartment *compartment, const JitCompileOptions &options,

    40                  TempAllocator *alloc, MIRGraph *graph,

    41                  CompileInfo *info, const OptimizationInfo *optimizationInfo);

    43     TempAllocator &alloc() {

    44         return *alloc_;

    45     }

    46     MIRGraph &graph() {

    47         return *graph_;

    48     }

    49     bool ensureBallast() {

    50         return alloc().ensureBallast();

    51     }

    52     const JitRuntime *jitRuntime() const {

    53         return GetIonContext()->runtime->jitRuntime();

    54     }

    55     CompileInfo &info() {

    56         return *info_;

    57     }

    58     const OptimizationInfo &optimizationInfo() const {

    59         return *optimizationInfo_;

    60     }

    62     template <typename T>

    63     T * allocate(size_t count = 1) {

    64         if (count & mozilla::tl::MulOverflowMask<sizeof(T)>::value)

    65             return nullptr;

    66         return reinterpret_cast<T *>(alloc().allocate(sizeof(T) * count));

    67     }

    69     // Set an error state and prints a message. Returns false so errors can be

    70     // propagated up.

    71     bool abort(const char *message, ...);

    72     bool abortFmt(const char *message, va_list ap);

    74     bool errored() const {

    75         return error_;

    76     }

    78     bool instrumentedProfiling() {

    79         return GetIonContext()->runtime->spsProfiler().enabled();

    80     }

    82     // Whether the main thread is trying to cancel this build.

    83     bool shouldCancel(const char *why) {

    84         return cancelBuild_;

    85     }

    86     void cancel() {

    87         cancelBuild_ = true;

    88     }

    90     bool compilingAsmJS() const {

    91         return info_->script() == nullptr;

    92     }

    94     uint32_t maxAsmJSStackArgBytes() const {

    95         JS_ASSERT(compilingAsmJS());

    96         return maxAsmJSStackArgBytes_;

    97     }

    98     uint32_t resetAsmJSMaxStackArgBytes() {

    99         JS_ASSERT(compilingAsmJS());

   100         uint32_t old = maxAsmJSStackArgBytes_;

   101         maxAsmJSStackArgBytes_ = 0;

   102         return old;

   103     }

   104     void setAsmJSMaxStackArgBytes(uint32_t n) {

   105         JS_ASSERT(compilingAsmJS());

   106         maxAsmJSStackArgBytes_ = n;

   107     }

   108     void setPerformsCall() {

   109         performsCall_ = true;

   110     }

   111     bool performsCall() const {

   112         return performsCall_;

   113     }

   114     void setPerformsAsmJSCall() {

   115         JS_ASSERT(compilingAsmJS());

   116         setPerformsCall();

   117         performsAsmJSCall_ = true;

   118     }

   119     bool performsAsmJSCall() const {

   120         JS_ASSERT(compilingAsmJS());

   121         return performsAsmJSCall_;

   122     }

   123     void noteMinAsmJSHeapLength(uint32_t len) {

   124         minAsmJSHeapLength_ = len;

   125     }

   126     uint32_t minAsmJSHeapLength() const {

   127         return minAsmJSHeapLength_;

   128     }

   130     bool modifiesFrameArguments() const {

   131         return modifiesFrameArguments_;

   132     }

   134   public:

   135     CompileCompartment *compartment;

   137   protected:

   138     CompileInfo *info_;

   139     const OptimizationInfo *optimizationInfo_;

   140     TempAllocator *alloc_;

   141     JSFunction *fun_;

   142     uint32_t nslots_;

   143     MIRGraph *graph_;

   144     bool error_;

   145     mozilla::Atomic<bool, mozilla::Relaxed> cancelBuild_;

   147     uint32_t maxAsmJSStackArgBytes_;

   148     bool performsCall_;

   149     bool performsAsmJSCall_;

   150     uint32_t minAsmJSHeapLength_;

   152     // Keep track of whether frame arguments are modified during execution.

   153     // RegAlloc needs to know this as spilling values back to their register

   154     // slots is not compatible with that.

   155     bool modifiesFrameArguments_;

   157 #if defined(JS_ION_PERF)

   158     AsmJSPerfSpewer asmJSPerfSpewer_;

   160   public:

   161     AsmJSPerfSpewer &perfSpewer() { return asmJSPerfSpewer_; }

   162 #endif

   164   public:

   165     const JitCompileOptions options;

   166 };

   168 } // namespace jit

   169 } // namespace js

   171 #endif /* jit_MIRGenerator_h */

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