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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.
*/
#pragma once
#if ENABLE(WEBASSEMBLY)
#include <cstdint>
#include <limits>
#include <type_traits>
#include <wtf/HexNumber.h>
#include <wtf/text/MakeString.h>
#include <wtf/text/WTFString.h>
namespace JSC {
class JSWebAssemblyInstance;
namespace Wasm {
enum class ProtocolError : uint8_t;
class ModuleManager;
class FunctionCodeIndex;
/**
* VirtualAddress - WebAssembly virtual address encoding for LLDB debugging
*
* Encodes 64-bit virtual addresses for WebAssembly debugging with LLDB.
* Separates module code addresses from instance memory addresses.
*
* Address Format (64-bit):
* - Bits 63-62: Address Type (2 bits)
* - Bits 61-32: ID (30 bits) - ModuleID for code, InstanceID for memory
* - Bits 31-0: Offset (32 bits)
*
* Address Types:
* - 0x00 (Memory): Instance linear memory - uses InstanceID
* - 0x01 (Module): Module code/bytecode - uses ModuleID
* - 0x02 (Invalid): Invalid/unmapped regions
* - 0x03 (Invalid2): Invalid/unmapped regions
*
* Virtual Memory Layout:
* - 0x0000000000000000 - 0x3FFFFFFFFFFFFFFF: Memory regions
* - 0x4000000000000000 - 0x7FFFFFFFFFFFFFFF: Module regions
* - 0x8000000000000000 - 0xFFFFFFFFFFFFFFFF: Invalid regions
*
* Example:
*
* Module A (ID=0): Code at 0x4000000000000000
* ├── Instance 1 (ID=0): Memory at 0x0000000000000000
* ├── Instance 2 (ID=1): Memory at 0x0000000100000000
* └── Instance 3 (ID=2): Memory at 0x0000000200000000
*
* Module B (ID=1): Code at 0x4000000100000000
* └── Instance 4 (ID=3): Memory at 0x0000000300000000
*
* Memory Region Example:
*
* [0x0000000000000000-0x0000000001010000) rw- wasm_memory_0_0
* [0x0000000001010000-0x4000000000000000) ---
* [0x4000000000000000-0x40000000000013f1) r-x wasm_module_0
* [0x40000000000013f1-0xffffffffffffffff) ---
*/
class VirtualAddress {
public:
enum class Type : uint8_t {
Memory = 0x00, // Instance linear memory (uses InstanceID)
Module = 0x01, // Module code/bytecode (uses ModuleID)
Invalid = 0x02, // Invalid/unmapped regions
Invalid2 = 0x03 // Invalid/unmapped regions
};
static constexpr uint64_t MEMORY_BASE = 0x0000000000000000ULL;
static constexpr uint64_t MEMORY_END = 0x3FFFFFFFFFFFFFFFULL;
static constexpr uint64_t MODULE_BASE = 0x4000000000000000ULL;
static constexpr uint64_t MODULE_END = 0x7FFFFFFFFFFFFFFFULL;
static constexpr uint64_t INVALID_BASE = 0x8000000000000000ULL;
static constexpr uint64_t INVALID_END = 0xFFFFFFFFFFFFFFFFULL;
VirtualAddress()
: m_value(0)
{
}
explicit VirtualAddress(uint64_t addr)
: m_value(addr)
{
}
static VirtualAddress createMemory(uint32_t instanceId, uint32_t offset = 0)
{
return VirtualAddress(encode(Type::Memory, instanceId, offset));
}
static VirtualAddress createModule(uint32_t moduleId, uint32_t offset = 0)
{
return VirtualAddress(encode(Type::Module, moduleId, offset));
}
Type type() const { return static_cast<Type>((m_value & 0xC000000000000000ULL) >> 62); }
uint32_t id() const { return static_cast<uint32_t>((m_value & 0x3FFFFFFF00000000ULL) >> 32); }
uint32_t offset() const { return static_cast<uint32_t>(m_value & 0x00000000FFFFFFFFULL); }
String hex() const { return makeString(WTF::hex(m_value, WTF::Lowercase)); }
uint64_t value() const { return m_value; }
bool isInvalidType() const
{
Type addressType = type();
return addressType == Type::Invalid || addressType == Type::Invalid2;
}
JS_EXPORT_PRIVATE static VirtualAddress toVirtual(JSWebAssemblyInstance*, FunctionCodeIndex, const uint8_t* pc);
JS_EXPORT_PRIVATE uint8_t* toPhysicalPC(const ModuleManager&);
operator uint64_t() const { return m_value; }
void dump(PrintStream&) const;
private:
static uint64_t encode(Type type, uint32_t id, uint32_t offset)
{
return (((uint64_t)type << 62) | ((uint64_t)id << 32) | ((uint64_t)offset << 0));
}
uint64_t m_value;
};
} // namespace Wasm
} // namespace JSC
namespace WTF {
template<> struct DefaultHash<JSC::Wasm::VirtualAddress> {
static unsigned hash(const JSC::Wasm::VirtualAddress& address)
{
return DefaultHash<uint64_t>::hash(static_cast<uint64_t>(address));
}
static bool equal(const JSC::Wasm::VirtualAddress& a, const JSC::Wasm::VirtualAddress& b)
{
return static_cast<uint64_t>(a) == static_cast<uint64_t>(b);
}
static constexpr bool safeToCompareToEmptyOrDeleted = true;
};
template<> struct HashTraits<JSC::Wasm::VirtualAddress> : GenericHashTraits<JSC::Wasm::VirtualAddress> {
static JSC::Wasm::VirtualAddress emptyValue() { return JSC::Wasm::VirtualAddress(); }
static void constructDeletedValue(JSC::Wasm::VirtualAddress& slot) { slot = JSC::Wasm::VirtualAddress(std::numeric_limits<uint64_t>::max()); }
static bool isDeletedValue(const JSC::Wasm::VirtualAddress& value) { return static_cast<uint64_t>(value) == std::numeric_limits<uint64_t>::max(); }
};
} // namespace WTF
#endif // ENABLE(WEBASSEMBLY)
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