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Copy pathWasmVirtualAddress.cpp
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116 lines (96 loc) · 4.55 KB
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/*
* Copyright (C) 2025 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.
*/
#include "config.h"
#include "WasmVirtualAddress.h"
#if ENABLE(WEBASSEMBLY_DEBUGGER)
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
#include "JSWebAssemblyInstance.h"
#include "Options.h"
#include "WasmCallee.h"
#include "WasmDebugServerUtilities.h"
#include "WasmFormat.h"
#include "WasmModuleInformation.h"
#include <wtf/DataLog.h>
namespace JSC {
namespace Wasm {
void VirtualAddress::dump(PrintStream& out) const
{
Type addressType = this->type();
uint32_t addressInstanceId = this->instanceId();
uint32_t addressOffset = this->offset();
out.print("VirtualAddress(0x", WTF::hex(m_value, WTF::Lowercase), " -> ");
switch (addressType) {
case Type::Memory:
out.print("Memory[instance:", addressInstanceId, ", offset:0x", WTF::hex(addressOffset, WTF::Lowercase), "])");
break;
case Type::Module:
out.print("Module[instance:", addressInstanceId, ", offset:0x", WTF::hex(addressOffset, WTF::Lowercase), "])");
break;
default:
out.print("Unknown[type:", (int)addressType, ", id:", addressInstanceId, ", offset:0x", WTF::hex(addressOffset, WTF::Lowercase), "])");
break;
}
}
VirtualAddress VirtualAddress::toVirtual(JSWebAssemblyInstance* jsInstance, FunctionCodeIndex index, const uint8_t* pc)
{
RELEASE_ASSERT(jsInstance->debugId() != INVALID_ID, "Wasm debugger encoding an unregistered instance");
const Wasm::FunctionData& functionData = jsInstance->moduleInformation().functions[index];
uint32_t offset = static_cast<uint32_t>(pc - &functionData.data[0] + functionData.start);
return VirtualAddress::createModule(jsInstance->debugId(), offset);
}
uint8_t* VirtualAddress::toPhysicalPC(JSWebAssemblyInstance& jsInstance)
{
RELEASE_ASSERT(type() == VirtualAddress::Type::Module);
uint32_t offset = this->offset();
// All instances of a module share one bytecode buffer, so this resolves to the same physical
// PC for every instance of the same module.
const ModuleInformation& moduleInfo = jsInstance.moduleInformation();
if (offset >= moduleInfo.debugInfo->source.size())
return nullptr;
const auto& functions = moduleInfo.functions;
#if ASSERT_ENABLED
for (size_t i = 1; i < functions.size(); ++i)
ASSERT(functions[i - 1].start <= functions[i].start);
#endif
auto it = std::upper_bound(functions.begin(), functions.end(), offset, [](uint32_t offset, const FunctionData& func) {
return offset < func.start;
});
if (it != functions.begin()) {
--it;
const FunctionData& functionData = *it;
if (offset >= functionData.start && offset < functionData.end) {
uint32_t offsetInFunction = offset - functionData.start;
uint8_t* pc = const_cast<uint8_t*>(&functionData.data[0]) + offsetInFunction;
dataLogLnIf(Options::verboseWasmDebugger(), "Resolved virtual address: ", *this, " to physical PC: ", RawPointer(pc), " (function index: ", static_cast<size_t>(it - functions.begin()), ")");
return pc;
}
}
dataLogLnIf(Options::verboseWasmDebugger(), "Failed to resolve virtual address: ", *this, " - offset not found in any function");
return nullptr;
}
} // namespace Wasm
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(WEBASSEMBLY_DEBUGGER)