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/*
* Copyright (C) 2016-2021 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 "WasmBinding.h"
#if ENABLE(WEBASSEMBLY)
#include "CCallHelpers.h"
#include "LinkBuffer.h"
#include "WasmCallingConvention.h"
#include "WasmInstance.h"
namespace JSC { namespace Wasm {
using JIT = CCallHelpers;
Expected<MacroAssemblerCodeRef<WasmEntryPtrTag>, BindingFailure> wasmToWasm(unsigned importIndex)
{
// FIXME: Consider uniquify the stubs based on signature + index to see if this saves memory.
// https://bugs.webkit.org/show_bug.cgi?id=184157
const PinnedRegisterInfo& pinnedRegs = PinnedRegisterInfo::get();
JIT jit;
GPRReg scratch = wasmCallingConvention().prologueScratchGPRs[0];
GPRReg baseMemory = pinnedRegs.baseMemoryPointer;
ASSERT(baseMemory != GPRReg::InvalidGPRReg);
ASSERT(baseMemory != scratch);
ASSERT(pinnedRegs.boundsCheckingSizeRegister != baseMemory);
ASSERT(pinnedRegs.boundsCheckingSizeRegister != scratch);
GPRReg sizeRegAsScratch = pinnedRegs.boundsCheckingSizeRegister;
ASSERT(sizeRegAsScratch != GPRReg::InvalidGPRReg);
// B3's call codegen ensures that the JSCell is a WebAssemblyFunction.
jit.loadWasmContextInstance(sizeRegAsScratch); // Old Instance*
// Get the callee's Wasm::Instance and set it as WasmContext's instance. The caller will take care of restoring its own Instance.
jit.loadPtr(JIT::Address(sizeRegAsScratch, Instance::offsetOfTargetInstance(importIndex)), baseMemory); // Instance*.
// While we're accessing that cacheline, also get the wasm entrypoint so we can tail call to it below.
jit.loadPtr(JIT::Address(sizeRegAsScratch, Instance::offsetOfWasmEntrypointLoadLocation(importIndex)), scratch);
jit.storeWasmContextInstance(baseMemory);
jit.loadPtr(JIT::Address(sizeRegAsScratch, Instance::offsetOfCachedStackLimit()), sizeRegAsScratch);
jit.storePtr(sizeRegAsScratch, JIT::Address(baseMemory, Instance::offsetOfCachedStackLimit()));
// FIXME the following code assumes that all Wasm::Instance have the same pinned registers. https://bugs.webkit.org/show_bug.cgi?id=162952
// Set up the callee's baseMemory register as well as the memory size registers.
{
jit.loadPtr(JIT::Address(baseMemory, Wasm::Instance::offsetOfCachedBoundsCheckingSize()), pinnedRegs.boundsCheckingSizeRegister); // Bound checking size.
jit.loadPtr(JIT::Address(baseMemory, Wasm::Instance::offsetOfCachedMemory()), baseMemory); // Wasm::Memory::TaggedArrayStoragePtr<void> (void*).
jit.cageConditionallyAndUntag(Gigacage::Primitive, baseMemory, pinnedRegs.boundsCheckingSizeRegister, wasmCallingConvention().prologueScratchGPRs[1]);
}
// Tail call into the callee WebAssembly function.
jit.loadPtr(scratch, scratch);
jit.farJump(scratch, WasmEntryPtrTag);
LinkBuffer patchBuffer(jit, GLOBAL_THUNK_ID, LinkBuffer::Profile::WasmThunk, JITCompilationCanFail);
if (UNLIKELY(patchBuffer.didFailToAllocate()))
return makeUnexpected(BindingFailure::OutOfMemory);
return FINALIZE_WASM_CODE(patchBuffer, WasmEntryPtrTag, "WebAssembly->WebAssembly import[%i]", importIndex);
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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