1/*
2 * Copyright (C) 2016 Yusuke Suzuki <utatane.tea@gmail.com>
3 * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include "CallFrameClosure.h"
30#include "Exception.h"
31#include "Instruction.h"
32#include "Interpreter.h"
33#include "JSCPtrTag.h"
34#include "LLIntData.h"
35#include "UnlinkedCodeBlock.h"
36#include <wtf/UnalignedAccess.h>
37
38namespace JSC {
39
40inline Opcode Interpreter::getOpcode(OpcodeID id)
41{
42 return LLInt::getOpcode(id);
43}
44
45inline OpcodeID Interpreter::getOpcodeID(Opcode opcode)
46{
47#if ENABLE(COMPUTED_GOTO_OPCODES)
48 ASSERT(isOpcode(opcode));
49#if USE(LLINT_EMBEDDED_OPCODE_ID)
50 // The OpcodeID is embedded in the int32_t word preceding the location of
51 // the LLInt code for the opcode (see the EMBED_OPCODE_ID_IF_NEEDED macro
52 // in LowLevelInterpreter.cpp).
53 auto codePtr = MacroAssemblerCodePtr<BytecodePtrTag>::createFromExecutableAddress(opcode);
54 int32_t* opcodeIDAddress = codePtr.dataLocation<int32_t*>() - 1;
55 OpcodeID opcodeID = static_cast<OpcodeID>(WTF::unalignedLoad<int32_t>(opcodeIDAddress));
56 ASSERT(opcodeID < NUMBER_OF_BYTECODE_IDS);
57 return opcodeID;
58#else
59 return opcodeIDTable().get(opcode);
60#endif // USE(LLINT_EMBEDDED_OPCODE_ID)
61
62#else // not ENABLE(COMPUTED_GOTO_OPCODES)
63 return opcode;
64#endif
65}
66
67ALWAYS_INLINE JSValue Interpreter::execute(CallFrameClosure& closure)
68{
69 VM& vm = *closure.vm;
70 auto throwScope = DECLARE_THROW_SCOPE(vm);
71
72 ASSERT(!vm.isCollectorBusyOnCurrentThread());
73 ASSERT(vm.currentThreadIsHoldingAPILock());
74
75 StackStats::CheckPoint stackCheckPoint;
76
77 VMTraps::Mask mask(VMTraps::NeedTermination, VMTraps::NeedWatchdogCheck);
78 if (UNLIKELY(vm.needTrapHandling(mask))) {
79 vm.handleTraps(closure.oldCallFrame, mask);
80 RETURN_IF_EXCEPTION(throwScope, throwScope.exception());
81 }
82
83 // Execute the code:
84 throwScope.release();
85 JSValue result = closure.functionExecutable->generatedJITCodeForCall()->execute(&vm, closure.protoCallFrame);
86
87 return checkedReturn(result);
88}
89
90} // namespace JSC
91