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/*
* 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
* 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 "WebAssemblyFunction.h"
#if ENABLE(WEBASSEMBLY)
#include "B3Compilation.h"
#include "JSCInlines.h"
#include "JSFunctionInlines.h"
#include "JSObject.h"
#include "JSWebAssemblyInstance.h"
#include "JSWebAssemblyMemory.h"
#include "JSWebAssemblyRuntimeError.h"
#include "LLIntThunks.h"
#include "ProtoCallFrame.h"
#include "VM.h"
#include "WasmCallee.h"
#include "WasmContext.h"
#include "WasmFormat.h"
#include "WasmMemory.h"
#include <wtf/FastTLS.h>
#include <wtf/SystemTracing.h>
namespace JSC {
const ClassInfo WebAssemblyFunction::s_info = { "WebAssemblyFunction", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(WebAssemblyFunction) };
static EncodedJSValue JSC_HOST_CALL callWebAssemblyFunction(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
WebAssemblyFunction* wasmFunction = jsDynamicCast<WebAssemblyFunction*>(vm, exec->jsCallee());
if (!wasmFunction)
return JSValue::encode(throwException(exec, scope, createTypeError(exec, "expected a WebAssembly function", defaultSourceAppender, runtimeTypeForValue(exec->jsCallee()))));
Wasm::SignatureIndex signatureIndex = wasmFunction->signatureIndex();
const Wasm::Signature& signature = Wasm::SignatureInformation::get(signatureIndex);
// Make sure that the memory we think we are going to run with matches the one we expect.
ASSERT(wasmFunction->instance()->codeBlock()->isSafeToRun(wasmFunction->instance()->memory()));
{
// Check if we have a disallowed I64 use.
for (unsigned argIndex = 0; argIndex < signature.argumentCount(); ++argIndex) {
if (signature.argument(argIndex) == Wasm::I64) {
JSWebAssemblyRuntimeError* error = JSWebAssemblyRuntimeError::create(exec, vm, exec->lexicalGlobalObject()->WebAssemblyRuntimeErrorStructure(),
"WebAssembly function with an i64 argument can't be called from JavaScript");
return JSValue::encode(throwException(exec, scope, error));
}
}
if (signature.returnType() == Wasm::I64) {
JSWebAssemblyRuntimeError* error = JSWebAssemblyRuntimeError::create(exec, vm, exec->lexicalGlobalObject()->WebAssemblyRuntimeErrorStructure(),
"WebAssembly function that returns i64 can't be called from JavaScript");
return JSValue::encode(throwException(exec, scope, error));
}
}
TraceScope traceScope(WebAssemblyExecuteStart, WebAssemblyExecuteEnd);
Vector<JSValue> boxedArgs;
Wasm::Context* wasmContext = wasmFunction->instance();
// When we don't use fast TLS to store the context, the js
// entry wrapper expects the WasmContext* as the first argument.
if (!Wasm::useFastTLSForContext())
boxedArgs.append(wasmContext);
for (unsigned argIndex = 0; argIndex < signature.argumentCount(); ++argIndex) {
JSValue arg = exec->argument(argIndex);
switch (signature.argument(argIndex)) {
case Wasm::I32:
arg = JSValue::decode(arg.toInt32(exec));
break;
case Wasm::F32:
arg = JSValue::decode(bitwise_cast<uint32_t>(arg.toFloat(exec)));
break;
case Wasm::F64:
arg = JSValue::decode(bitwise_cast<uint64_t>(arg.toNumber(exec)));
break;
case Wasm::Void:
case Wasm::I64:
case Wasm::Func:
case Wasm::Anyfunc:
RELEASE_ASSERT_NOT_REACHED();
}
RETURN_IF_EXCEPTION(scope, encodedJSValue());
boxedArgs.append(arg);
}
JSValue firstArgument = JSValue();
int argCount = 1;
JSValue* remainingArgs = nullptr;
if (boxedArgs.size()) {
remainingArgs = boxedArgs.data();
firstArgument = *remainingArgs;
remainingArgs++;
argCount = boxedArgs.size();
}
// Note: we specifically use the WebAssemblyFunction as the callee to begin with in the ProtoCallFrame.
// The reason for this is that calling into the llint may stack overflow, and the stack overflow
// handler might read the global object from the callee.
ProtoCallFrame protoCallFrame;
protoCallFrame.init(nullptr, wasmFunction, firstArgument, argCount, remainingArgs);
// FIXME Do away with this entire function, and only use the entrypoint generated by B3. https://bugs.webkit.org/show_bug.cgi?id=166486
Wasm::Context* prevWasmContext = Wasm::loadContext(vm);
{
// We do the stack check here for the wrapper function because we don't
// want to emit a stack check inside every wrapper function.
const intptr_t sp = bitwise_cast<intptr_t>(&sp); // A proxy for the current stack pointer.
const intptr_t frameSize = (boxedArgs.size() + CallFrame::headerSizeInRegisters) * sizeof(Register);
const intptr_t stackSpaceUsed = 2 * frameSize; // We're making two calls. One to the wrapper, and one to the actual wasm code.
if (UNLIKELY((sp < stackSpaceUsed) || ((sp - stackSpaceUsed) < bitwise_cast<intptr_t>(vm.softStackLimit()))))
return JSValue::encode(throwException(exec, scope, createStackOverflowError(exec)));
}
Wasm::storeContext(vm, wasmContext);
ASSERT(wasmFunction->instance());
ASSERT(wasmFunction->instance() == Wasm::loadContext(vm));
EncodedJSValue rawResult = vmEntryToWasm(wasmFunction->jsEntrypoint(), &vm, &protoCallFrame);
// We need to make sure this is in a register or on the stack since it's stored in Vector<JSValue>.
// This probably isn't strictly necessary, since the WebAssemblyFunction* should keep the instance
// alive. But it's good hygiene.
wasmContext->use();
if (prevWasmContext != wasmContext) {
// This is just for some extra safety instead of leaving a cached
// value in there. If we ever forget to set the value to be a real
// bounds, this will force every stack overflow check to immediately
// fire.
wasmContext->setCachedStackLimit(bitwise_cast<void*>(std::numeric_limits<uintptr_t>::max()));
}
Wasm::storeContext(vm, prevWasmContext);
RETURN_IF_EXCEPTION(scope, { });
switch (signature.returnType()) {
case Wasm::Void:
return JSValue::encode(jsUndefined());
case Wasm::I32:
return JSValue::encode(jsNumber(static_cast<int32_t>(rawResult)));
case Wasm::F32:
return JSValue::encode(jsNumber(purifyNaN(static_cast<double>(bitwise_cast<float>(static_cast<int32_t>(rawResult))))));
case Wasm::F64:
return JSValue::encode(jsNumber(purifyNaN(bitwise_cast<double>(rawResult))));
case Wasm::I64:
case Wasm::Func:
case Wasm::Anyfunc:
RELEASE_ASSERT_NOT_REACHED();
}
return EncodedJSValue();
}
WebAssemblyFunction* WebAssemblyFunction::create(VM& vm, JSGlobalObject* globalObject, unsigned length, const String& name, JSWebAssemblyInstance* instance, Wasm::Callee& jsEntrypoint, Wasm::WasmEntrypointLoadLocation wasmEntrypoint, Wasm::SignatureIndex signatureIndex)
{
NativeExecutable* executable = vm.getHostFunction(callWebAssemblyFunction, NoIntrinsic, callHostFunctionAsConstructor, nullptr, name);
Structure* structure = globalObject->webAssemblyFunctionStructure();
WebAssemblyFunction* function = new (NotNull, allocateCell<WebAssemblyFunction>(vm.heap)) WebAssemblyFunction(vm, globalObject, structure, jsEntrypoint, wasmEntrypoint, signatureIndex);
function->finishCreation(vm, executable, length, name, instance);
ASSERT_WITH_MESSAGE(!function->isLargeAllocation(), "WebAssemblyFunction should be allocated not in large allocation since it is JSCallee.");
return function;
}
Structure* WebAssemblyFunction::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
ASSERT(globalObject);
return Structure::create(vm, globalObject, prototype, TypeInfo(WebAssemblyFunctionType, StructureFlags), info());
}
WebAssemblyFunction::WebAssemblyFunction(VM& vm, JSGlobalObject* globalObject, Structure* structure, Wasm::Callee& jsEntrypoint, Wasm::WasmEntrypointLoadLocation wasmEntrypoint, Wasm::SignatureIndex signatureIndex)
: Base(vm, globalObject, structure)
, m_jsEntrypoint(jsEntrypoint.entrypoint())
, m_wasmFunction(Wasm::CallableFunction(signatureIndex, wasmEntrypoint))
{ }
} // namespace JSC
#endif // ENABLE(WEBASSEMBLY)
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