Line data    Source code

       1             : // Copyright 2018 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_WASM_WASM_FEATURES_H_
       6             : #define V8_WASM_WASM_FEATURES_H_
       7             : 
       8             : // The feature flags are declared in their own header.
       9             : #include "src/base/macros.h"
      10             : #include "src/wasm/wasm-feature-flags.h"
      11             : 
      12             : // All features, including features that do not have flags.
      13             : #define FOREACH_WASM_FEATURE FOREACH_WASM_FEATURE_FLAG
      14             : 
      15             : namespace v8 {
      16             : namespace internal {
      17             : class Isolate;
      18             : namespace wasm {
      19             : 
      20             : #define COMMA ,
      21             : #define SPACE
      22             : #define DECL_FIELD(feat, desc, val) bool feat = false;
      23             : #define JUST_TRUE(feat, desc, val) true
      24             : #define JUST_FALSE(feat, desc, val) false
      25             : #define DECL_PARAM(feat, desc, val) bool p##feat
      26             : #define DO_INIT(feat, desc, val) feat(p##feat)
      27             : 
      28             : // Enabled or detected features.
      29             : struct WasmFeatures {
      30             :   FOREACH_WASM_FEATURE(DECL_FIELD, SPACE)
      31             : 
      32         393 :   constexpr WasmFeatures() = default;
      33             : 
      34             :   explicit constexpr WasmFeatures(FOREACH_WASM_FEATURE(DECL_PARAM, COMMA))
      35     1630350 :       : FOREACH_WASM_FEATURE(DO_INIT, COMMA) {}
      36             : };
      37             : 
      38             : static constexpr WasmFeatures kAllWasmFeatures{
      39             :     FOREACH_WASM_FEATURE(JUST_TRUE, COMMA)};
      40             : 
      41             : static constexpr WasmFeatures kNoWasmFeatures{
      42             :     FOREACH_WASM_FEATURE(JUST_FALSE, COMMA)};
      43             : 
      44             : #undef JUST_TRUE
      45             : #undef JUST_FALSE
      46             : #undef DECL_FIELD
      47             : #undef DECL_PARAM
      48             : #undef DO_INIT
      49             : #undef COMMA
      50             : #undef SPACE
      51             : 
      52             : static constexpr WasmFeatures kAsmjsWasmFeatures = kNoWasmFeatures;
      53             : 
      54             : V8_EXPORT_PRIVATE WasmFeatures WasmFeaturesFromFlags();
      55             : 
      56             : // Enables features based on both commandline flags and the isolate.
      57             : // Precondition: A valid context must be set in {isolate->context()}.
      58             : V8_EXPORT_PRIVATE WasmFeatures WasmFeaturesFromIsolate(Isolate* isolate);
      59             : 
      60             : V8_EXPORT_PRIVATE void UnionFeaturesInto(WasmFeatures* dst,
      61             :                                          const WasmFeatures& src);
      62             : 
      63             : }  // namespace wasm
      64             : }  // namespace internal
      65             : }  // namespace v8
      66             : 
      67             : #endif  // V8_WASM_WASM_FEATURES_H_