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WasmSections.h
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116 lines (101 loc) · 4.09 KB
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/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(WEBASSEMBLY)
#if !ASSERT_ENABLED
IGNORE_RETURN_TYPE_WARNINGS_BEGIN
#endif
namespace JSC { namespace Wasm {
#define FOR_EACH_KNOWN_WASM_SECTION(macro) \
macro(Type, 1, "Function signature declarations") \
macro(Import, 2, "Import declarations") \
macro(Function, 3, "Function declarations") \
macro(Table, 4, "Indirect function table and other tables") \
macro(Memory, 5, "Memory attributes") \
macro(Global, 6, "Global declarations") \
macro(Export, 7, "Exports") \
macro(Start, 8, "Start function declaration") \
macro(Element, 9, "Elements section") \
macro(Code, 10, "Function bodies (code)") \
macro(Data, 11, "Data segments") \
macro(DataCount, 12, "Data count")
enum class Section : uint8_t {
// It's important that Begin is less than every other section number and that Custom is greater.
// This only works because section numbers are currently monotonically increasing.
// Also, Begin is not a real section but is used as a marker for validating the ordering
// of sections.
Begin = 0,
#define DEFINE_WASM_SECTION_ENUM(NAME, ID, DESCRIPTION) NAME = ID,
FOR_EACH_KNOWN_WASM_SECTION(DEFINE_WASM_SECTION_ENUM)
#undef DEFINE_WASM_SECTION_ENUM
Custom
};
static_assert(static_cast<uint8_t>(Section::Begin) < static_cast<uint8_t>(Section::Type), "Begin should come before the first known section.");
template<typename Int>
inline bool isKnownSection(Int section)
{
switch (section) {
#define VALIDATE_SECTION(NAME, ID, DESCRIPTION) case static_cast<Int>(Section::NAME): return true;
FOR_EACH_KNOWN_WASM_SECTION(VALIDATE_SECTION)
#undef VALIDATE_SECTION
default:
return false;
}
}
inline bool decodeSection(uint8_t sectionByte, Section& section)
{
section = Section::Custom;
if (!sectionByte)
return true;
if (!isKnownSection(sectionByte))
return false;
section = static_cast<Section>(sectionByte);
return true;
}
inline bool validateOrder(Section previousKnown, Section next)
{
ASSERT(isKnownSection(previousKnown) || previousKnown == Section::Begin);
if (previousKnown == Section::DataCount && next == Section::Code)
return true;
return static_cast<uint8_t>(previousKnown) < static_cast<uint8_t>(next);
}
inline const char* makeString(Section section)
{
switch (section) {
case Section::Begin:
return "Begin";
case Section::Custom:
return "Custom";
#define STRINGIFY_SECTION_NAME(NAME, ID, DESCRIPTION) case Section::NAME: return #NAME;
FOR_EACH_KNOWN_WASM_SECTION(STRINGIFY_SECTION_NAME)
#undef STRINGIFY_SECTION_NAME
}
ASSERT_NOT_REACHED();
}
} } // namespace JSC::Wasm
#if !ASSERT_ENABLED
IGNORE_RETURN_TYPE_WARNINGS_END
#endif
#endif // ENABLE(WEBASSEMBLY)