mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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114 lines
3.9 KiB
C++
114 lines
3.9 KiB
C++
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(WEBASSEMBLY)
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#if ASSERT_DISABLED
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IGNORE_RETURN_TYPE_WARNINGS_BEGIN
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#endif
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namespace JSC { namespace Wasm {
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#define FOR_EACH_KNOWN_WASM_SECTION(macro) \
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macro(Type, 1, "Function signature declarations") \
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macro(Import, 2, "Import declarations") \
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macro(Function, 3, "Function declarations") \
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macro(Table, 4, "Indirect function table and other tables") \
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macro(Memory, 5, "Memory attributes") \
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macro(Global, 6, "Global declarations") \
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macro(Export, 7, "Exports") \
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macro(Start, 8, "Start function declaration") \
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macro(Element, 9, "Elements section") \
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macro(Code, 10, "Function bodies (code)") \
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macro(Data, 11, "Data segments")
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enum class Section : uint8_t {
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// It's important that Begin is less than every other section number and that Custom is greater.
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// This only works because section numbers are currently monotonically increasing.
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// Also, Begin is not a real section but is used as a marker for validating the ordering
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// of sections.
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Begin = 0,
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#define DEFINE_WASM_SECTION_ENUM(NAME, ID, DESCRIPTION) NAME = ID,
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FOR_EACH_KNOWN_WASM_SECTION(DEFINE_WASM_SECTION_ENUM)
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#undef DEFINE_WASM_SECTION_ENUM
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Custom
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};
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static_assert(static_cast<uint8_t>(Section::Begin) < static_cast<uint8_t>(Section::Type), "Begin should come before the first known section.");
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template<typename Int>
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inline bool isKnownSection(Int section)
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{
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switch (section) {
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#define VALIDATE_SECTION(NAME, ID, DESCRIPTION) case static_cast<Int>(Section::NAME): return true;
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FOR_EACH_KNOWN_WASM_SECTION(VALIDATE_SECTION)
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#undef VALIDATE_SECTION
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default:
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return false;
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}
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}
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inline bool decodeSection(uint8_t sectionByte, Section& section)
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{
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section = Section::Custom;
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if (!sectionByte)
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return true;
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if (!isKnownSection(sectionByte))
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return false;
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section = static_cast<Section>(sectionByte);
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return true;
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}
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inline bool validateOrder(Section previousKnown, Section next)
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{
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ASSERT(isKnownSection(previousKnown) || previousKnown == Section::Begin);
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return static_cast<uint8_t>(previousKnown) < static_cast<uint8_t>(next);
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}
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inline const char* makeString(Section section)
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{
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switch (section) {
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case Section::Begin:
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return "Begin";
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case Section::Custom:
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return "Custom";
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#define STRINGIFY_SECTION_NAME(NAME, ID, DESCRIPTION) case Section::NAME: return #NAME;
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FOR_EACH_KNOWN_WASM_SECTION(STRINGIFY_SECTION_NAME)
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#undef STRINGIFY_SECTION_NAME
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}
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ASSERT_NOT_REACHED();
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}
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} } // namespace JSC::Wasm
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#if ASSERT_DISABLED
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IGNORE_RETURN_TYPE_WARNINGS_END
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#endif
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#endif // ENABLE(WEBASSEMBLY)
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