Source/JavaScriptCore/wasm/WasmCallee.cpp

/*
 * Copyright (C) 2016-2017 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
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#include "config.h"
#include "WasmCallee.h"

#if ENABLE(WEBASSEMBLY)

#include "LLIntExceptions.h"
#include "WasmCalleeRegistry.h"
#include "WasmCallingConvention.h"

namespace JSC { namespace Wasm {

Callee::Callee(Wasm::CompilationMode compilationMode)
    : m_compilationMode(compilationMode)
{
    CalleeRegistry::singleton().registerCallee(this);
}

Callee::Callee(Wasm::CompilationMode compilationMode, size_t index, std::pair<const Name*, RefPtr<NameSection>>&& name)
    : m_compilationMode(compilationMode)
    , m_indexOrName(index, WTFMove(name))
{
    CalleeRegistry::singleton().registerCallee(this);
}

Callee::~Callee()
{
    CalleeRegistry::singleton().unregisterCallee(this);
}

void Callee::dump(PrintStream& out) const
{
    out.print(makeString(m_indexOrName));
}

const HandlerInfo* Callee::handlerForIndex(Instance& instance, unsigned index, const Tag* tag)
{
    ASSERT(hasExceptionHandlers());
    return HandlerInfo::handlerForIndex(instance, m_exceptionHandlers, index, tag);
}

JITCallee::JITCallee(Wasm::CompilationMode compilationMode, Entrypoint&& entrypoint)
    : Callee(compilationMode)
    , m_entrypoint(WTFMove(entrypoint))
{
}

JITCallee::JITCallee(Wasm::CompilationMode compilationMode, Entrypoint&& entrypoint, size_t index, std::pair<const Name*, RefPtr<NameSection>>&& name, Vector<UnlinkedWasmToWasmCall>&& unlinkedCalls)
    : Callee(compilationMode, index, WTFMove(name))
    , m_wasmToWasmCallsites(WTFMove(unlinkedCalls))
    , m_entrypoint(WTFMove(entrypoint))
{
}

LLIntCallee::LLIntCallee(std::unique_ptr<FunctionCodeBlock> codeBlock, size_t index, std::pair<const Name*, RefPtr<NameSection>>&& name)
    : Callee(Wasm::CompilationMode::LLIntMode, index, WTFMove(name))
    , m_codeBlock(WTFMove(codeBlock))
{
    linkExceptionHandlers();
}

void LLIntCallee::linkExceptionHandlers()
{
    if (size_t count = m_codeBlock->numberOfExceptionHandlers()) {
        m_exceptionHandlers.resizeToFit(count);
        for (size_t i = 0; i < count; i++) {
            const UnlinkedHandlerInfo& unlinkedHandler = m_codeBlock->exceptionHandler(i);
            HandlerInfo& handler = m_exceptionHandlers[i];
            auto& instruction = *m_codeBlock->instructions().at(unlinkedHandler.m_target).ptr();
            CodeLocationLabel<ExceptionHandlerPtrTag> target;
            if (unlinkedHandler.m_type == HandlerType::Catch)
                target = CodeLocationLabel<ExceptionHandlerPtrTag>(LLInt::handleWasmCatch(instruction.width<WasmOpcodeTraits>()).code());
            else
                target = CodeLocationLabel<ExceptionHandlerPtrTag>(LLInt::handleWasmCatchAll(instruction.width<WasmOpcodeTraits>()).code());

            handler.initialize(unlinkedHandler, target);
        }
    }
}

void LLIntCallee::setEntrypoint(MacroAssemblerCodePtr<WasmEntryPtrTag> entrypoint)
{
    m_entrypoint = entrypoint;
}

MacroAssemblerCodePtr<WasmEntryPtrTag> LLIntCallee::entrypoint() const
{
    return m_entrypoint;
}

RegisterAtOffsetList* LLIntCallee::calleeSaveRegisters()
{
    static LazyNeverDestroyed<RegisterAtOffsetList> calleeSaveRegisters;
    static std::once_flag initializeFlag;
    std::call_once(initializeFlag, [] {
        RegisterSet registers;
        registers.set(GPRInfo::regCS0); // Wasm::Instance
#if CPU(X86_64)
        registers.set(GPRInfo::regCS2); // PB
#elif CPU(ARM64)
        registers.set(GPRInfo::regCS7); // PB
#else
#error Unsupported architecture.
#endif
        ASSERT(registers.numberOfSetRegisters() == numberOfLLIntCalleeSaveRegisters);
        calleeSaveRegisters.construct(WTFMove(registers));
    });
    return &calleeSaveRegisters.get();
}

std::tuple<void*, void*> LLIntCallee::range() const
{
    return { nullptr, nullptr };
}

void OptimizingJITCallee::linkExceptionHandlers()
{
    size_t count = m_unlinkedExceptionHandlers.size();
    m_exceptionHandlers.resizeToFit(count);
    for (size_t i = 0; i < count; i++) {
        HandlerInfo& handler = m_exceptionHandlers[i];
        const UnlinkedHandlerInfo& unlinkedHandler = m_unlinkedExceptionHandlers[i];
        CodeLocationLabel<ExceptionHandlerPtrTag> location = m_exceptionHandlerLocations[i];
        handler.initialize(unlinkedHandler, location);
    }
    m_unlinkedExceptionHandlers.clear();
    m_exceptionHandlerLocations.clear();
}

const Vector<OSREntryValue>& OptimizingJITCallee::stackmap(CallSiteIndex callSiteIndex) const
{
    auto iter = m_stackmaps.find(callSiteIndex);
    if (iter == m_stackmaps.end()) {
        for (auto pair : m_stackmaps) {
            dataLog(pair.key.bits(), ": ");
            for (auto value : pair.value)
                dataLog(value, ", ");
            dataLogLn("");
        }
    }
    RELEASE_ASSERT(iter != m_stackmaps.end());
    return iter->value;
}


} } // namespace JSC::Wasm

#endif // ENABLE(WEBASSEMBLY)