mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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92 lines
4.5 KiB
C++
92 lines
4.5 KiB
C++
/*
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* Copyright (C) 2016-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "WasmBinding.h"
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#if ENABLE(WEBASSEMBLY)
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#include "CCallHelpers.h"
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#include "LinkBuffer.h"
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#include "WasmCallingConvention.h"
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#include "WasmInstance.h"
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namespace JSC { namespace Wasm {
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using JIT = CCallHelpers;
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Expected<MacroAssemblerCodeRef<WasmEntryPtrTag>, BindingFailure> wasmToWasm(unsigned importIndex)
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{
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// FIXME: Consider uniquify the stubs based on signature + index to see if this saves memory.
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// https://bugs.webkit.org/show_bug.cgi?id=184157
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const PinnedRegisterInfo& pinnedRegs = PinnedRegisterInfo::get();
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JIT jit;
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GPRReg scratch = wasmCallingConvention().prologueScratchGPRs[0];
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GPRReg baseMemory = pinnedRegs.baseMemoryPointer;
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ASSERT(baseMemory != GPRReg::InvalidGPRReg);
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ASSERT(baseMemory != scratch);
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ASSERT(pinnedRegs.boundsCheckingSizeRegister != baseMemory);
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ASSERT(pinnedRegs.boundsCheckingSizeRegister != scratch);
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GPRReg sizeRegAsScratch = pinnedRegs.boundsCheckingSizeRegister;
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ASSERT(sizeRegAsScratch != GPRReg::InvalidGPRReg);
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// B3's call codegen ensures that the JSCell is a WebAssemblyFunction.
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jit.loadWasmContextInstance(sizeRegAsScratch); // Old Instance*
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// Get the callee's Wasm::Instance and set it as WasmContext's instance. The caller will take care of restoring its own Instance.
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jit.loadPtr(JIT::Address(sizeRegAsScratch, Instance::offsetOfTargetInstance(importIndex)), baseMemory); // Instance*.
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// While we're accessing that cacheline, also get the wasm entrypoint so we can tail call to it below.
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jit.loadPtr(JIT::Address(sizeRegAsScratch, Instance::offsetOfWasmEntrypointLoadLocation(importIndex)), scratch);
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jit.storeWasmContextInstance(baseMemory);
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jit.loadPtr(JIT::Address(sizeRegAsScratch, Instance::offsetOfCachedStackLimit()), sizeRegAsScratch);
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jit.storePtr(sizeRegAsScratch, JIT::Address(baseMemory, Instance::offsetOfCachedStackLimit()));
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// FIXME the following code assumes that all Wasm::Instance have the same pinned registers. https://bugs.webkit.org/show_bug.cgi?id=162952
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// Set up the callee's baseMemory register as well as the memory size registers.
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{
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GPRReg scratchOrBoundsCheckingSize = !Gigacage::isEnabled(Gigacage::Primitive) ? pinnedRegs.boundsCheckingSizeRegister : wasmCallingConvention().prologueScratchGPRs[1];
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jit.loadPtr(JIT::Address(baseMemory, Wasm::Instance::offsetOfCachedBoundsCheckingSize()), pinnedRegs.boundsCheckingSizeRegister); // Bound checking size.
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jit.loadPtr(JIT::Address(baseMemory, Wasm::Instance::offsetOfCachedMemory()), baseMemory); // Wasm::Memory::TaggedArrayStoragePtr<void> (void*).
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jit.cageConditionally(Gigacage::Primitive, baseMemory, pinnedRegs.boundsCheckingSizeRegister, scratchOrBoundsCheckingSize);
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}
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// Tail call into the callee WebAssembly function.
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jit.loadPtr(scratch, scratch);
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jit.farJump(scratch, WasmEntryPtrTag);
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LinkBuffer patchBuffer(jit, GLOBAL_THUNK_ID, JITCompilationCanFail);
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if (UNLIKELY(patchBuffer.didFailToAllocate()))
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return makeUnexpected(BindingFailure::OutOfMemory);
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return FINALIZE_WASM_CODE(patchBuffer, WasmEntryPtrTag, "WebAssembly->WebAssembly import[%i]", importIndex);
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}
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} } // namespace JSC::Wasm
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#endif // ENABLE(WEBASSEMBLY)
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