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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef js_WasmFeatures_h
#define js_WasmFeatures_h
// [SMDOC] WebAssembly feature gating
//
// Declarative listing of WebAssembly optional features. This macro is used to
// generate most of the feature gating code in a centralized manner. See
// 'Adding a feature' below for the exact steps needed to add a new feature.
//
// # Adding a feature
//
// 1. Add a configure switch for the feature in js/moz.configure
// 2. Add a WASM_FEATURE_ENABLED #define below
// 3. Add the feature to JS_FOR_WASM_FEATURES
// a. capitalized name: Used for naming of feature functions, including
// wasmFeatureEnabled shell function.
// b. lower case name: Used for naming of feature flag variables, including
// in wasm::FeatureArgs.
// c. compile predicate: Set to WASM_FEATURE_ENABLED
// d. compiler predicate: Expression of compilers that this feature depends
// on.
// e. flag predicate: Expression used to predicate enablement of feature
// flag. Useful for disabling a feature when dependent feature is not
// enabled or if we are fuzzing.
// f. preference name: The stem of the browser preference. Will be expanded
// to `javascript.options.wasm-FEATURE`.
// 4. Add the preference to module/libpref/init/StaticPrefList.yaml
// a. Set `set_spidermonkey_pref: startup`
// b. Set value to 'true' for default features, @IS_NIGHTLY_BUILD@ for
// tentative features, and 'false' for experimental features.
// 5. [fuzzing] Add the feature to gluesmith/src/lib.rs, if wasm-smith has
// support for it.
#ifdef ENABLE_WASM_RELAXED_SIMD
# define WASM_RELAXED_SIMD_ENABLED 1
#else
# define WASM_RELAXED_SIMD_ENABLED 0
#endif
#ifdef ENABLE_WASM_MEMORY_CONTROL
# define WASM_MEMORY_CONTROL_ENABLED 1
#else
# define WASM_MEMORY_CONTROL_ENABLED 0
#endif
#ifdef ENABLE_WASM_JSPI
# define WASM_JSPI_ENABLED 1
#else
# define WASM_JSPI_ENABLED 0
#endif
#ifdef ENABLE_WASM_MOZ_INTGEMM
# define WASM_MOZ_INTGEMM_ENABLED 1
#else
# define WASM_MOZ_INTGEMM_ENABLED 0
#endif
#ifdef ENABLE_WASM_BRANCH_HINTING
# define WASM_BRANCH_HINTING_ENABLED 1
#else
# define WASM_BRANCH_HINTING_ENABLED 0
#endif
// clang-format off
#define JS_FOR_WASM_FEATURES(FEATURE) \
FEATURE( \
/* capitalized name */ RelaxedSimd, \
/* lower case name */ v128Relaxed, \
/* compile predicate */ WASM_RELAXED_SIMD_ENABLED, \
/* compiler predicate */ AnyCompilerAvailable(cx), \
/* flag predicate */ js::jit::JitSupportsWasmSimd(), \
/* flag force enable */ false, \
/* flag fuzz enable */ true, \
/* preference name */ relaxed_simd) \
FEATURE( \
/* capitalized name */ MemoryControl, \
/* lower case name */ memoryControl, \
/* compile predicate */ WASM_MEMORY_CONTROL_ENABLED, \
/* compiler predicate */ AnyCompilerAvailable(cx), \
/* flag predicate */ true, \
/* flag force enable */ false, \
/* flag fuzz enable */ false, \
/* preference name */ memory_control) \
FEATURE( \
/* capitalized name */ JSPromiseIntegration, \
/* lower case name */ jsPromiseIntegration, \
/* compile predicate */ WASM_JSPI_ENABLED, \
/* compiler predicate */ IonPlatformSupport(), \
/* flag predicate */ true, \
/* flag force enable */ false, \
/* flag fuzz enable */ true, \
/* preference name */ js_promise_integration) \
FEATURE( \
/* capitalized name */ MozIntGemm, \
/* lower case name */ mozIntGemm, \
/* compile predicate */ WASM_MOZ_INTGEMM_ENABLED, \
/* compiler predicate */ AnyCompilerAvailable(cx), \
/* flag predicate */ IsPrivilegedContext(cx), \
/* flag force enable */ false, \
/* flag fuzz enable */ false, \
/* preference name */ moz_intgemm) \
FEATURE( \
/* capitalized name */ TestSerialization, \
/* lower case name */ testSerialization, \
/* compile predicate */ 1, \
/* compiler predicate */ IonAvailable(cx), \
/* flag predicate */ true, \
/* flag force enable */ false, \
/* flag fuzz enable */ false, \
/* preference name */ test_serialization) \
FEATURE( \
/* capitalized name */ BranchHinting, \
/* lower case name */ branchHinting, \
/* compile predicate */ WASM_BRANCH_HINTING_ENABLED, \
/* compiler predicate */ IonAvailable(cx), \
/* flag predicate */ true, \
/* flag force enable */ false, \
/* flag fuzz enable */ true, \
/* preference name */ branch_hinting)
// clang-format on
#endif // js_WasmFeatures_h
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