1/*
2 * Copyright (C) 2016-2019 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "WebAssemblyFunction.h"
28
29#if ENABLE(WEBASSEMBLY)
30
31#include "B3Compilation.h"
32#include "FrameTracers.h"
33#include "JSCInlines.h"
34#include "JSFunctionInlines.h"
35#include "JSObject.h"
36#include "JSToWasm.h"
37#include "JSWebAssemblyHelpers.h"
38#include "JSWebAssemblyInstance.h"
39#include "JSWebAssemblyMemory.h"
40#include "JSWebAssemblyRuntimeError.h"
41#include "LLIntThunks.h"
42#include "LinkBuffer.h"
43#include "ProtoCallFrameInlines.h"
44#include "VM.h"
45#include "WasmCallee.h"
46#include "WasmCallingConvention.h"
47#include "WasmContextInlines.h"
48#include "WasmFormat.h"
49#include "WasmMemory.h"
50#include "WasmMemoryInformation.h"
51#include "WasmModuleInformation.h"
52#include "WasmSignatureInlines.h"
53#include <wtf/FastTLS.h>
54#include <wtf/StackPointer.h>
55#include <wtf/SystemTracing.h>
56
57namespace JSC {
58
59const ClassInfo WebAssemblyFunction::s_info = { "WebAssemblyFunction", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(WebAssemblyFunction) };
60
61static EncodedJSValue JSC_HOST_CALL callWebAssemblyFunction(JSGlobalObject* globalObject, CallFrame* callFrame)
62{
63 VM& vm = globalObject->vm();
64 auto scope = DECLARE_THROW_SCOPE(vm);
65 WebAssemblyFunction* wasmFunction = jsCast<WebAssemblyFunction*>(callFrame->jsCallee());
66 Wasm::SignatureIndex signatureIndex = wasmFunction->signatureIndex();
67 const Wasm::Signature& signature = Wasm::SignatureInformation::get(signatureIndex);
68
69 // Make sure that the memory we think we are going to run with matches the one we expect.
70 ASSERT(wasmFunction->instance()->instance().codeBlock()->isSafeToRun(wasmFunction->instance()->memory()->memory().mode()));
71
72 Optional<TraceScope> traceScope;
73 if (Options::useTracePoints())
74 traceScope.emplace(WebAssemblyExecuteStart, WebAssemblyExecuteEnd);
75
76 Vector<JSValue, MarkedArgumentBuffer::inlineCapacity> boxedArgs;
77 JSWebAssemblyInstance* instance = wasmFunction->instance();
78 Wasm::Instance* wasmInstance = &instance->instance();
79
80 for (unsigned argIndex = 0; argIndex < signature.argumentCount(); ++argIndex) {
81 JSValue arg = callFrame->argument(argIndex);
82 switch (signature.argument(argIndex)) {
83 case Wasm::I32:
84 arg = JSValue::decode(arg.toInt32(globalObject));
85 break;
86 case Wasm::Funcref: {
87 if (!isWebAssemblyHostFunction(vm, arg) && !arg.isNull())
88 return JSValue::encode(throwException(globalObject, scope, createJSWebAssemblyRuntimeError(globalObject, vm, "Funcref must be an exported wasm function")));
89 break;
90 }
91 case Wasm::Anyref:
92 break;
93 case Wasm::I64:
94 arg = JSValue();
95 break;
96 case Wasm::F32:
97 arg = JSValue::decode(bitwise_cast<uint32_t>(arg.toFloat(globalObject)));
98 break;
99 case Wasm::F64:
100 arg = JSValue::decode(bitwise_cast<uint64_t>(arg.toNumber(globalObject)));
101 break;
102 case Wasm::Void:
103 case Wasm::Func:
104 RELEASE_ASSERT_NOT_REACHED();
105 }
106 RETURN_IF_EXCEPTION(scope, encodedJSValue());
107 boxedArgs.append(arg);
108 }
109
110 // When we don't use fast TLS to store the context, the JS
111 // entry wrapper expects a JSWebAssemblyInstance as the |this| value argument.
112 JSValue context = Wasm::Context::useFastTLS() ? JSValue() : instance;
113 JSValue* args = boxedArgs.data();
114 int argCount = boxedArgs.size() + 1;
115
116 // Note: we specifically use the WebAssemblyFunction as the callee to begin with in the ProtoCallFrame.
117 // The reason for this is that calling into the llint may stack overflow, and the stack overflow
118 // handler might read the global object from the callee.
119 ProtoCallFrame protoCallFrame;
120 protoCallFrame.init(nullptr, globalObject, wasmFunction, context, argCount, args);
121
122 // FIXME Do away with this entire function, and only use the entrypoint generated by B3. https://bugs.webkit.org/show_bug.cgi?id=166486
123 Wasm::Instance* prevWasmInstance = vm.wasmContext.load();
124 {
125 // We do the stack check here for the wrapper function because we don't
126 // want to emit a stack check inside every wrapper function.
127 const intptr_t sp = bitwise_cast<intptr_t>(currentStackPointer());
128 const intptr_t frameSize = (boxedArgs.size() + CallFrame::headerSizeInRegisters) * sizeof(Register);
129 const intptr_t stackSpaceUsed = 2 * frameSize; // We're making two calls. One to the wrapper, and one to the actual wasm code.
130 if (UNLIKELY((sp < stackSpaceUsed) || ((sp - stackSpaceUsed) < bitwise_cast<intptr_t>(vm.softStackLimit()))))
131 return JSValue::encode(throwException(globalObject, scope, createStackOverflowError(globalObject)));
132 }
133 vm.wasmContext.store(wasmInstance, vm.softStackLimit());
134 ASSERT(wasmFunction->instance());
135 ASSERT(&wasmFunction->instance()->instance() == vm.wasmContext.load());
136 EncodedJSValue rawResult = vmEntryToWasm(wasmFunction->jsEntrypoint(MustCheckArity).executableAddress(), &vm, &protoCallFrame);
137 // We need to make sure this is in a register or on the stack since it's stored in Vector<JSValue>.
138 // This probably isn't strictly necessary, since the WebAssemblyFunction* should keep the instance
139 // alive. But it's good hygiene.
140 instance->use();
141 if (prevWasmInstance != wasmInstance) {
142 // This is just for some extra safety instead of leaving a cached
143 // value in there. If we ever forget to set the value to be a real
144 // bounds, this will force every stack overflow check to immediately
145 // fire. The stack limit never changes while executing except when
146 // WebAssembly is used through the JSC API: API users can ask the code
147 // to migrate threads.
148 wasmInstance->setCachedStackLimit(bitwise_cast<void*>(std::numeric_limits<uintptr_t>::max()));
149 }
150 vm.wasmContext.store(prevWasmInstance, vm.softStackLimit());
151 RETURN_IF_EXCEPTION(scope, { });
152
153 return rawResult;
154}
155
156bool WebAssemblyFunction::useTagRegisters() const
157{
158 const auto& signature = Wasm::SignatureInformation::get(signatureIndex());
159 return signature.argumentCount() || !signature.returnsVoid();
160}
161
162RegisterSet WebAssemblyFunction::calleeSaves() const
163{
164 return Wasm::PinnedRegisterInfo::get().toSave(instance()->memoryMode());
165}
166
167RegisterAtOffsetList WebAssemblyFunction::usedCalleeSaveRegisters() const
168{
169 return RegisterAtOffsetList { calleeSaves(), RegisterAtOffsetList::OffsetBaseType::FramePointerBased };
170}
171
172ptrdiff_t WebAssemblyFunction::previousInstanceOffset() const
173{
174 ptrdiff_t result = calleeSaves().numberOfSetRegisters() * sizeof(CPURegister);
175 result = -result - sizeof(CPURegister);
176#if !ASSERT_DISABLED
177 ptrdiff_t minOffset = 1;
178 for (const RegisterAtOffset& regAtOffset : usedCalleeSaveRegisters()) {
179 ptrdiff_t offset = regAtOffset.offset();
180 ASSERT(offset < 0);
181 minOffset = std::min(offset, minOffset);
182 }
183 ASSERT(minOffset - static_cast<ptrdiff_t>(sizeof(CPURegister)) == result);
184#endif
185 return result;
186}
187
188Wasm::Instance* WebAssemblyFunction::previousInstance(CallFrame* callFrame)
189{
190 ASSERT(callFrame->callee().rawPtr() == m_jsToWasmICCallee.get());
191 auto* result = *bitwise_cast<Wasm::Instance**>(bitwise_cast<char*>(callFrame) + previousInstanceOffset());
192 return result;
193}
194
195MacroAssemblerCodePtr<JSEntryPtrTag> WebAssemblyFunction::jsCallEntrypointSlow()
196{
197 VM& vm = this->vm();
198 CCallHelpers jit;
199
200 const auto& signature = Wasm::SignatureInformation::get(signatureIndex());
201 const auto& pinnedRegs = Wasm::PinnedRegisterInfo::get();
202 RegisterAtOffsetList registersToSpill = usedCalleeSaveRegisters();
203
204 auto& moduleInformation = instance()->instance().module().moduleInformation();
205
206 const Wasm::WasmCallingConvention& wasmCC = Wasm::wasmCallingConvention();
207 Wasm::CallInformation wasmCallInfo = wasmCC.callInformationFor(signature);
208 Wasm::CallInformation jsCallInfo = Wasm::jsCallingConvention().callInformationFor(signature, Wasm::CallRole::Callee);
209 RegisterAtOffsetList savedResultRegisters = wasmCallInfo.computeResultsOffsetList();
210
211 unsigned totalFrameSize = registersToSpill.size() * sizeof(CPURegister);
212 totalFrameSize += sizeof(CPURegister); // Slot for the VM's previous wasm instance.
213 totalFrameSize += wasmCallInfo.headerAndArgumentStackSizeInBytes;
214 totalFrameSize += savedResultRegisters.size() * sizeof(CPURegister);
215
216 if (wasmCallInfo.argumentsIncludeI64 || wasmCallInfo.resultsIncludeI64)
217 return nullptr;
218
219 totalFrameSize = WTF::roundUpToMultipleOf(stackAlignmentBytes(), totalFrameSize);
220
221 jit.emitFunctionPrologue();
222 jit.subPtr(MacroAssembler::TrustedImm32(totalFrameSize), MacroAssembler::stackPointerRegister);
223 jit.store64(CCallHelpers::TrustedImm64(0), CCallHelpers::addressFor(CallFrameSlot::codeBlock));
224
225 for (const RegisterAtOffset& regAtOffset : registersToSpill) {
226 GPRReg reg = regAtOffset.reg().gpr();
227 ptrdiff_t offset = regAtOffset.offset();
228 jit.storePtr(reg, CCallHelpers::Address(GPRInfo::callFrameRegister, offset));
229 }
230
231 GPRReg scratchGPR = Wasm::wasmCallingConvention().prologueScratchGPRs[1];
232 bool stackLimitGPRIsClobbered = false;
233 GPRReg stackLimitGPR = Wasm::wasmCallingConvention().prologueScratchGPRs[0];
234 jit.loadPtr(vm.addressOfSoftStackLimit(), stackLimitGPR);
235
236 CCallHelpers::JumpList slowPath;
237 slowPath.append(jit.branchPtr(CCallHelpers::Above, MacroAssembler::stackPointerRegister, GPRInfo::callFrameRegister));
238 slowPath.append(jit.branchPtr(CCallHelpers::Below, MacroAssembler::stackPointerRegister, stackLimitGPR));
239
240 // Ensure:
241 // argCountPlusThis - 1 >= signature.argumentCount()
242 // argCountPlusThis >= signature.argumentCount() + 1
243 // FIXME: We should handle mismatched arity
244 // https://bugs.webkit.org/show_bug.cgi?id=196564
245 slowPath.append(jit.branch32(CCallHelpers::Below,
246 CCallHelpers::payloadFor(CallFrameSlot::argumentCount), CCallHelpers::TrustedImm32(signature.argumentCount() + 1)));
247
248 if (useTagRegisters())
249 jit.emitMaterializeTagCheckRegisters();
250
251 // Loop backwards so we can use the first floating point argument as a scratch.
252 FPRReg scratchFPR = Wasm::wasmCallingConvention().fprArgs[0].fpr();
253 for (unsigned i = signature.argumentCount(); i--;) {
254 CCallHelpers::Address calleeFrame = CCallHelpers::Address(MacroAssembler::stackPointerRegister, 0);
255 CCallHelpers::Address jsParam(GPRInfo::callFrameRegister, jsCallInfo.params[i].offsetFromFP());
256 bool isStack = wasmCallInfo.params[i].isStackArgument();
257
258 auto type = signature.argument(i);
259 switch (type) {
260 case Wasm::I32: {
261 jit.load64(jsParam, scratchGPR);
262 slowPath.append(jit.branchIfNotInt32(scratchGPR));
263 if (isStack)
264 jit.store32(scratchGPR, calleeFrame.withOffset(wasmCallInfo.params[i].offsetFromSP()));
265 else
266 jit.zeroExtend32ToPtr(scratchGPR, wasmCallInfo.params[i].gpr());
267 break;
268 }
269 case Wasm::Funcref: {
270 // Ensure we have a WASM exported function.
271 jit.load64(jsParam, scratchGPR);
272 auto isNull = jit.branchIfNull(scratchGPR);
273 slowPath.append(jit.branchIfNotCell(scratchGPR));
274
275 stackLimitGPRIsClobbered = true;
276 jit.emitLoadStructure(vm, scratchGPR, scratchGPR, stackLimitGPR);
277 jit.loadPtr(CCallHelpers::Address(scratchGPR, Structure::classInfoOffset()), scratchGPR);
278
279 static_assert(std::is_final<WebAssemblyFunction>::value, "We do not check for subtypes below");
280 static_assert(std::is_final<WebAssemblyWrapperFunction>::value, "We do not check for subtypes below");
281
282 auto isWasmFunction = jit.branchPtr(CCallHelpers::Equal, scratchGPR, CCallHelpers::TrustedImmPtr(WebAssemblyFunction::info()));
283 slowPath.append(jit.branchPtr(CCallHelpers::NotEqual, scratchGPR, CCallHelpers::TrustedImmPtr(WebAssemblyWrapperFunction::info())));
284
285 isWasmFunction.link(&jit);
286 isNull.link(&jit);
287 FALLTHROUGH;
288 }
289 case Wasm::Anyref: {
290 if (isStack) {
291 jit.load64(jsParam, scratchGPR);
292 jit.store64(scratchGPR, calleeFrame.withOffset(wasmCallInfo.params[i].offsetFromSP()));
293 } else
294 jit.load64(jsParam, wasmCallInfo.params[i].gpr());
295 break;
296 }
297 case Wasm::F32:
298 case Wasm::F64: {
299 if (!isStack)
300 scratchFPR = wasmCallInfo.params[i].fpr();
301 auto moveToDestination = [&] () {
302 if (isStack) {
303 if (signature.argument(i) == Wasm::F32)
304 jit.storeFloat(scratchFPR, calleeFrame.withOffset(wasmCallInfo.params[i].offsetFromSP()));
305 else
306 jit.storeDouble(scratchFPR, calleeFrame.withOffset(wasmCallInfo.params[i].offsetFromSP()));
307 }
308 };
309
310 jit.load64(jsParam, scratchGPR);
311 slowPath.append(jit.branchIfNotNumber(scratchGPR));
312 auto isInt32 = jit.branchIfInt32(scratchGPR);
313
314 jit.unboxDouble(scratchGPR, scratchGPR, scratchFPR);
315 if (signature.argument(i) == Wasm::F32)
316 jit.convertDoubleToFloat(scratchFPR, scratchFPR);
317 moveToDestination();
318 auto done = jit.jump();
319
320 isInt32.link(&jit);
321 if (signature.argument(i) == Wasm::F32) {
322 jit.convertInt32ToFloat(scratchGPR, scratchFPR);
323 moveToDestination();
324 } else {
325 jit.convertInt32ToDouble(scratchGPR, scratchFPR);
326 moveToDestination();
327 }
328 done.link(&jit);
329
330 break;
331 }
332 default:
333 RELEASE_ASSERT_NOT_REACHED();
334 }
335 }
336
337 // At this point, we're committed to doing a fast call.
338
339 if (Wasm::Context::useFastTLS())
340 jit.loadWasmContextInstance(scratchGPR);
341 else
342 jit.loadPtr(vm.wasmContext.pointerToInstance(), scratchGPR);
343 ptrdiff_t previousInstanceOffset = this->previousInstanceOffset();
344 jit.storePtr(scratchGPR, CCallHelpers::Address(GPRInfo::callFrameRegister, previousInstanceOffset));
345
346 jit.move(CCallHelpers::TrustedImmPtr(&instance()->instance()), scratchGPR);
347 if (Wasm::Context::useFastTLS())
348 jit.storeWasmContextInstance(scratchGPR);
349 else {
350 jit.move(scratchGPR, pinnedRegs.wasmContextInstancePointer);
351 jit.storePtr(scratchGPR, vm.wasmContext.pointerToInstance());
352 }
353 if (stackLimitGPRIsClobbered)
354 jit.loadPtr(vm.addressOfSoftStackLimit(), stackLimitGPR);
355 jit.storePtr(stackLimitGPR, CCallHelpers::Address(scratchGPR, Wasm::Instance::offsetOfCachedStackLimit()));
356
357 if (!!moduleInformation.memory) {
358 GPRReg baseMemory = pinnedRegs.baseMemoryPointer;
359 GPRReg scratchOrSize = stackLimitGPR;
360 auto mode = instance()->memoryMode();
361
362 if (isARM64E()) {
363 if (mode != Wasm::MemoryMode::Signaling)
364 scratchOrSize = pinnedRegs.sizeRegister;
365 jit.loadPtr(CCallHelpers::Address(scratchGPR, Wasm::Instance::offsetOfCachedMemorySize()), scratchOrSize);
366 } else {
367 if (mode != Wasm::MemoryMode::Signaling)
368 jit.loadPtr(CCallHelpers::Address(scratchGPR, Wasm::Instance::offsetOfCachedMemorySize()), pinnedRegs.sizeRegister);
369 }
370
371 jit.loadPtr(CCallHelpers::Address(scratchGPR, Wasm::Instance::offsetOfCachedMemory()), baseMemory);
372 jit.cageConditionally(Gigacage::Primitive, baseMemory, scratchOrSize, scratchOrSize);
373 }
374
375 // We use this callee to indicate how to unwind past these types of frames:
376 // 1. We need to know where to get callee saves.
377 // 2. We need to know to restore the previous wasm context.
378 if (!m_jsToWasmICCallee)
379 m_jsToWasmICCallee.set(vm, this, JSToWasmICCallee::create(vm, globalObject(), this));
380 jit.storePtr(CCallHelpers::TrustedImmPtr(m_jsToWasmICCallee.get()), CCallHelpers::addressFor(CallFrameSlot::callee));
381
382 {
383 // FIXME: Currently we just do an indirect jump. But we should teach the Module
384 // how to repatch us:
385 // https://bugs.webkit.org/show_bug.cgi?id=196570
386 jit.loadPtr(entrypointLoadLocation(), scratchGPR);
387 jit.call(scratchGPR, WasmEntryPtrTag);
388 }
389
390 marshallJSResult(jit, signature, wasmCallInfo, savedResultRegisters);
391
392 ASSERT(!RegisterSet::runtimeTagRegisters().contains(GPRInfo::nonPreservedNonReturnGPR));
393 jit.loadPtr(CCallHelpers::Address(GPRInfo::callFrameRegister, previousInstanceOffset), GPRInfo::nonPreservedNonReturnGPR);
394 if (Wasm::Context::useFastTLS())
395 jit.storeWasmContextInstance(GPRInfo::nonPreservedNonReturnGPR);
396 else
397 jit.storePtr(GPRInfo::nonPreservedNonReturnGPR, vm.wasmContext.pointerToInstance());
398
399 auto emitRestoreCalleeSaves = [&] {
400 for (const RegisterAtOffset& regAtOffset : registersToSpill) {
401 GPRReg reg = regAtOffset.reg().gpr();
402 ASSERT(reg != GPRInfo::returnValueGPR);
403 ptrdiff_t offset = regAtOffset.offset();
404 jit.loadPtr(CCallHelpers::Address(GPRInfo::callFrameRegister, offset), reg);
405 }
406 };
407
408 emitRestoreCalleeSaves();
409
410 jit.emitFunctionEpilogue();
411 jit.ret();
412
413 slowPath.link(&jit);
414 emitRestoreCalleeSaves();
415 jit.move(CCallHelpers::TrustedImmPtr(this), GPRInfo::regT0);
416 jit.emitFunctionEpilogue();
417#if CPU(ARM64E)
418 jit.untagReturnAddress();
419#endif
420 auto jumpToHostCallThunk = jit.jump();
421
422 LinkBuffer linkBuffer(jit, nullptr, JITCompilationCanFail);
423 if (UNLIKELY(linkBuffer.didFailToAllocate()))
424 return nullptr;
425
426 linkBuffer.link(jumpToHostCallThunk, CodeLocationLabel<JSEntryPtrTag>(executable()->entrypointFor(CodeForCall, MustCheckArity).executableAddress()));
427 m_jsCallEntrypoint = FINALIZE_WASM_CODE(linkBuffer, WasmEntryPtrTag, "JS->Wasm IC");
428 return m_jsCallEntrypoint.code();
429}
430
431WebAssemblyFunction* WebAssemblyFunction::create(VM& vm, JSGlobalObject* globalObject, Structure* structure, unsigned length, const String& name, JSWebAssemblyInstance* instance, Wasm::Callee& jsEntrypoint, Wasm::WasmToWasmImportableFunction::LoadLocation wasmToWasmEntrypointLoadLocation, Wasm::SignatureIndex signatureIndex)
432{
433 NativeExecutable* executable = vm.getHostFunction(callWebAssemblyFunction, NoIntrinsic, callHostFunctionAsConstructor, nullptr, name);
434 WebAssemblyFunction* function = new (NotNull, allocateCell<WebAssemblyFunction>(vm.heap)) WebAssemblyFunction(vm, globalObject, structure, jsEntrypoint, wasmToWasmEntrypointLoadLocation, signatureIndex);
435 function->finishCreation(vm, executable, length, name, instance);
436 return function;
437}
438
439Structure* WebAssemblyFunction::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
440{
441 ASSERT(globalObject);
442 return Structure::create(vm, globalObject, prototype, TypeInfo(JSFunctionType, StructureFlags), info());
443}
444
445WebAssemblyFunction::WebAssemblyFunction(VM& vm, JSGlobalObject* globalObject, Structure* structure, Wasm::Callee& jsEntrypoint, Wasm::WasmToWasmImportableFunction::LoadLocation wasmToWasmEntrypointLoadLocation, Wasm::SignatureIndex signatureIndex)
446 : Base { vm, globalObject, structure }
447 , m_jsEntrypoint { jsEntrypoint.entrypoint() }
448 , m_importableFunction { signatureIndex, wasmToWasmEntrypointLoadLocation }
449{ }
450
451void WebAssemblyFunction::visitChildren(JSCell* cell, SlotVisitor& visitor)
452{
453 WebAssemblyFunction* thisObject = jsCast<WebAssemblyFunction*>(cell);
454 ASSERT_GC_OBJECT_INHERITS(thisObject, info());
455
456 Base::visitChildren(thisObject, visitor);
457 visitor.append(thisObject->m_jsToWasmICCallee);
458}
459
460void WebAssemblyFunction::destroy(JSCell* cell)
461{
462 static_cast<WebAssemblyFunction*>(cell)->WebAssemblyFunction::~WebAssemblyFunction();
463}
464
465} // namespace JSC
466
467#endif // ENABLE(WEBASSEMBLY)
468