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/*
* Copyright (C) 2022 Leaning Technologies 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.
*/
#include "config.h"
#if ENABLE(WEBASSEMBLY)
#include "WasmBranchHintsSectionParser.h"
#include "WasmTypeDefinitionInlines.h"
namespace JSC {
namespace Wasm {
auto BranchHintsSectionParser::parse() -> PartialResult
{
uint32_t functionCount;
int64_t previousFunctionIndex = -1;
WASM_PARSER_FAIL_IF(!parseVarUInt32(functionCount), "can't get function count"_s);
for (uint32_t i = 0; i < functionCount; ++i) {
uint32_t functionIndex;
uint32_t hintCount;
WASM_PARSER_FAIL_IF(!parseVarUInt32(functionIndex), "can't get function index for function "_s, i);
WASM_PARSER_FAIL_IF(static_cast<int64_t>(functionIndex) < previousFunctionIndex, "invalid function index "_s, functionIndex, " for function "_s, i);
previousFunctionIndex = functionIndex;
WASM_PARSER_FAIL_IF(!parseVarUInt32(hintCount), "can't get number of hints for function "_s, i);
if (!hintCount)
continue;
int64_t previousBranchOffset = -1;
BranchHintMap branchHintsForFunction;
for (uint32_t j = 0; j < hintCount; ++j) {
uint32_t branchOffset;
WASM_PARSER_FAIL_IF(!parseVarUInt32(branchOffset), "can't get branch offset for hint "_s, j);
WASM_PARSER_FAIL_IF(static_cast<int64_t>(branchOffset) < previousBranchOffset
|| !m_info->branchHints.isValidKey(branchOffset), "invalid branch offset "_s, branchOffset, " for hint "_s, j);
previousBranchOffset = branchOffset;
uint32_t payloadSize;
WASM_PARSER_FAIL_IF(!parseVarUInt32(payloadSize), "can't get payload size for hint "_s, j);
WASM_PARSER_FAIL_IF(payloadSize != 0x1, "invalid payload size for hint "_s, j);
uint8_t parsedBranchHint;
WASM_PARSER_FAIL_IF(!parseVarUInt1(parsedBranchHint), "can't get or invalid branch hint value for hint "_s, j);
BranchHint branchHint = static_cast<BranchHint>(parsedBranchHint);
ASSERT(isValidBranchHint(branchHint));
branchHintsForFunction.add(branchOffset, branchHint);
}
m_info->branchHints.add(functionIndex, WTFMove(branchHintsForFunction));
}
return { };
}
}
} // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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