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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)
#include "B3Compilation.h"
#include "B3Procedure.h"
#include "WasmFormat.h"
#include "WasmOps.h"
#include "WasmSections.h"
#include <type_traits>
#include <wtf/Expected.h>
#include <wtf/LEBDecoder.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/WTFString.h>
namespace JSC { namespace Wasm {
namespace FailureHelper {
// FIXME We should move this to makeString. It's in its own namespace to enable C++ Argument Dependent Lookup à la std::swap: user code can deblare its own "boxFailure" and the fail() helper will find it.
static inline auto makeString(const char *failure) { return ASCIILiteral(failure); }
template <typename Int, typename = typename std::enable_if<std::is_integral<Int>::value>::type>
static inline auto makeString(Int failure) { return String::number(failure); }
}
template<typename SuccessType>
class Parser {
public:
typedef String ErrorType;
typedef UnexpectedType<ErrorType> UnexpectedResult;
typedef Expected<void, ErrorType> PartialResult;
typedef Expected<SuccessType, ErrorType> Result;
protected:
Parser(VM*, const uint8_t*, size_t);
bool WARN_UNUSED_RETURN consumeCharacter(char);
bool WARN_UNUSED_RETURN consumeString(const char*);
bool WARN_UNUSED_RETURN consumeUTF8String(String&, size_t);
bool WARN_UNUSED_RETURN parseVarUInt1(uint8_t&);
bool WARN_UNUSED_RETURN parseInt7(int8_t&);
bool WARN_UNUSED_RETURN parseUInt7(uint8_t&);
bool WARN_UNUSED_RETURN parseUInt8(uint8_t&);
bool WARN_UNUSED_RETURN parseUInt32(uint32_t&);
bool WARN_UNUSED_RETURN parseUInt64(uint64_t&);
bool WARN_UNUSED_RETURN parseVarUInt32(uint32_t&);
bool WARN_UNUSED_RETURN parseVarUInt64(uint64_t&);
bool WARN_UNUSED_RETURN parseVarInt32(int32_t&);
bool WARN_UNUSED_RETURN parseVarInt64(int64_t&);
bool WARN_UNUSED_RETURN parseResultType(Type&);
bool WARN_UNUSED_RETURN parseValueType(Type&);
bool WARN_UNUSED_RETURN parseExternalKind(ExternalKind&);
const uint8_t* source() const { return m_source; }
size_t length() const { return m_sourceLength; }
VM* m_vm;
size_t m_offset = 0;
template <typename ...Args>
NEVER_INLINE UnexpectedResult WARN_UNUSED_RETURN fail(Args... args) const
{
using namespace FailureHelper; // See ADL comment in namespace above.
return UnexpectedResult(makeString(ASCIILiteral("WebAssembly.Module doesn't parse at byte "), String::number(m_offset), ASCIILiteral(" / "), String::number(m_sourceLength), ASCIILiteral(": "), makeString(args)...));
}
#define WASM_PARSER_FAIL_IF(condition, ...) do { \
if (UNLIKELY(condition)) \
return fail(__VA_ARGS__); \
} while (0)
#define WASM_FAIL_IF_HELPER_FAILS(helper) do { \
auto helperResult = helper; \
if (UNLIKELY(!helperResult)) \
return helperResult.getUnexpected(); \
} while (0)
private:
const uint8_t* m_source;
size_t m_sourceLength;
};
template<typename SuccessType>
ALWAYS_INLINE Parser<SuccessType>::Parser(VM* vm, const uint8_t* sourceBuffer, size_t sourceLength)
: m_vm(vm)
, m_source(sourceBuffer)
, m_sourceLength(sourceLength)
{
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::consumeCharacter(char c)
{
if (m_offset >= length())
return false;
if (c == source()[m_offset]) {
m_offset++;
return true;
}
return false;
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::consumeString(const char* str)
{
unsigned start = m_offset;
if (m_offset >= length())
return false;
for (size_t i = 0; str[i]; i++) {
if (!consumeCharacter(str[i])) {
m_offset = start;
return false;
}
}
return true;
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::consumeUTF8String(String& result, size_t stringLength)
{
if (stringLength == 0) {
result = emptyString();
return true;
}
if (length() < stringLength || m_offset > length() - stringLength)
return false;
result = String::fromUTF8(static_cast<const LChar*>(&source()[m_offset]), stringLength);
m_offset += stringLength;
if (result.isEmpty())
return false;
return true;
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseVarUInt32(uint32_t& result)
{
return WTF::LEBDecoder::decodeUInt32(m_source, m_sourceLength, m_offset, result);
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseVarUInt64(uint64_t& result)
{
return WTF::LEBDecoder::decodeUInt64(m_source, m_sourceLength, m_offset, result);
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseVarInt32(int32_t& result)
{
return WTF::LEBDecoder::decodeInt32(m_source, m_sourceLength, m_offset, result);
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseVarInt64(int64_t& result)
{
return WTF::LEBDecoder::decodeInt64(m_source, m_sourceLength, m_offset, result);
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseUInt32(uint32_t& result)
{
if (length() < 4 || m_offset > length() - 4)
return false;
result = *reinterpret_cast<const uint32_t*>(source() + m_offset);
m_offset += 4;
return true;
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseUInt64(uint64_t& result)
{
if (length() < 8 || m_offset > length() - 8)
return false;
result = *reinterpret_cast<const uint64_t*>(source() + m_offset);
m_offset += 8;
return true;
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseUInt8(uint8_t& result)
{
if (m_offset >= length())
return false;
result = source()[m_offset++];
return true;
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseInt7(int8_t& result)
{
if (m_offset >= length())
return false;
uint8_t v = source()[m_offset++];
result = (v & 0x40) ? WTF::bitwise_cast<int8_t>(uint8_t(v | 0x80)) : v;
return (v & 0x80) == 0;
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseUInt7(uint8_t& result)
{
if (m_offset >= length())
return false;
result = source()[m_offset++];
return result < 0x80;
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseVarUInt1(uint8_t& result)
{
uint32_t temp;
if (!parseVarUInt32(temp))
return false;
if (temp > 1)
return false;
result = static_cast<uint8_t>(temp);
return true;
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseResultType(Type& result)
{
int8_t value;
if (!parseInt7(value))
return false;
if (!isValidType(value))
return false;
result = static_cast<Type>(value);
return true;
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseValueType(Type& result)
{
return parseResultType(result) && isValueType(result);
}
template<typename SuccessType>
ALWAYS_INLINE bool Parser<SuccessType>::parseExternalKind(ExternalKind& result)
{
uint8_t value;
if (!parseUInt7(value))
return false;
if (!isValidExternalKind(value))
return false;
result = static_cast<ExternalKind>(value);
return true;
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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