1/*
2 * Copyright (C) 2013, 2014 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 "FTLJSCall.h"
28
29#if ENABLE(FTL_JIT)
30
31#include "DFGNode.h"
32#include "LinkBuffer.h"
33
34namespace JSC { namespace FTL {
35
36JSCall::JSCall()
37    : m_stackmapID(UINT_MAX)
38    , m_node(nullptr)
39    , m_callLinkInfo(nullptr)
40    , m_instructionOffset(UINT_MAX)
41{
42}
43
44JSCall::JSCall(unsigned stackmapID, DFG::Node* node)
45    : m_stackmapID(stackmapID)
46    , m_node(node)
47    , m_callLinkInfo(nullptr)
48    , m_instructionOffset(0)
49{
50}
51
52void JSCall::emit(CCallHelpers& jit)
53{
54    m_callLinkInfo = jit.codeBlock()->addCallLinkInfo();
55
56    CCallHelpers::Jump slowPath = jit.branchPtrWithPatch(
57        CCallHelpers::NotEqual, GPRInfo::regT0, m_targetToCheck,
58        CCallHelpers::TrustedImmPtr(0));
59
60    jit.loadPtr(
61        CCallHelpers::Address(GPRInfo::regT0, JSFunction::offsetOfScopeChain()),
62        GPRInfo::regT1);
63    jit.store64(
64        GPRInfo::regT1,
65        CCallHelpers::Address(
66            CCallHelpers::stackPointerRegister,
67            sizeof(Register) * (JSStack::ScopeChain - JSStack::CallerFrameAndPCSize)));
68
69    m_fastCall = jit.nearCall();
70    CCallHelpers::Jump done = jit.jump();
71
72    slowPath.link(&jit);
73
74    jit.move(CCallHelpers::TrustedImmPtr(m_callLinkInfo), GPRInfo::regT2);
75    m_slowCall = jit.nearCall();
76
77    done.link(&jit);
78}
79
80void JSCall::link(VM& vm, LinkBuffer& linkBuffer)
81{
82    ThunkGenerator generator = linkThunkGeneratorFor(
83        m_node->op() == DFG::Construct ? CodeForConstruct : CodeForCall,
84        MustPreserveRegisters);
85
86    linkBuffer.link(
87        m_slowCall, FunctionPtr(vm.getCTIStub(generator).code().executableAddress()));
88
89    m_callLinkInfo->isFTL = true;
90    m_callLinkInfo->callType = m_node->op() == DFG::Construct ? CallLinkInfo::Construct : CallLinkInfo::Call;
91    m_callLinkInfo->codeOrigin = m_node->origin.semantic;
92    m_callLinkInfo->callReturnLocation = linkBuffer.locationOfNearCall(m_slowCall);
93    m_callLinkInfo->hotPathBegin = linkBuffer.locationOf(m_targetToCheck);
94    m_callLinkInfo->hotPathOther = linkBuffer.locationOfNearCall(m_fastCall);
95    m_callLinkInfo->calleeGPR = GPRInfo::regT0;
96}
97
98} } // namespace JSC::FTL
99
100#endif // ENABLE(FTL_JIT)
101
102