1/*
2 * Copyright (C) 2016 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 "WasmCallingConvention.h"
28
29#if ENABLE(WEBASSEMBLY)
30
31#include <wtf/NeverDestroyed.h>
32
33namespace JSC::Wasm {
34
35const JSCallingConvention& jsCallingConvention()
36{
37 static LazyNeverDestroyed<JSCallingConvention> staticJSCallingConvention;
38 static std::once_flag staticJSCCallingConventionFlag;
39 std::call_once(staticJSCCallingConventionFlag, [] () {
40 RegisterSet callerSaveRegisters = RegisterSet::allRegisters();
41 callerSaveRegisters.exclude(RegisterSet::calleeSaveRegisters());
42
43 staticJSCallingConvention.construct(Vector<Reg>(), Vector<Reg>(), RegisterSet::calleeSaveRegisters(), WTFMove(callerSaveRegisters));
44 });
45
46 return staticJSCallingConvention;
47}
48
49const WasmCallingConvention& wasmCallingConvention()
50{
51 static LazyNeverDestroyed<WasmCallingConvention> staticWasmCallingConvention;
52 static std::once_flag staticWasmCallingConventionFlag;
53 std::call_once(staticWasmCallingConventionFlag, [] () {
54 Vector<Reg> gprArgumentRegisters(GPRInfo::numberOfArgumentRegisters);
55 for (unsigned i = 0; i < GPRInfo::numberOfArgumentRegisters; ++i)
56 gprArgumentRegisters[i] = GPRInfo::toArgumentRegister(i);
57
58 Vector<Reg> fprArgumentRegisters(FPRInfo::numberOfArgumentRegisters);
59 for (unsigned i = 0; i < FPRInfo::numberOfArgumentRegisters; ++i)
60 fprArgumentRegisters[i] = FPRInfo::toArgumentRegister(i);
61
62 RegisterSet scratch = RegisterSet::allGPRs();
63 scratch.exclude(RegisterSet::calleeSaveRegisters());
64 scratch.exclude(RegisterSet::macroScratchRegisters());
65 scratch.exclude(RegisterSet::reservedHardwareRegisters());
66 scratch.exclude(RegisterSet::stackRegisters());
67 for (Reg reg : gprArgumentRegisters)
68 scratch.clear(reg);
69
70 Vector<GPRReg> scratchGPRs;
71 for (Reg reg : scratch)
72 scratchGPRs.append(reg.gpr());
73 RELEASE_ASSERT(scratchGPRs.size() >= 2);
74
75 RegisterSet callerSaveRegisters = RegisterSet::allRegisters();
76 callerSaveRegisters.exclude(RegisterSet::calleeSaveRegisters());
77
78 staticWasmCallingConvention.construct(WTFMove(gprArgumentRegisters), WTFMove(fprArgumentRegisters), WTFMove(scratchGPRs), RegisterSet::calleeSaveRegisters(), WTFMove(callerSaveRegisters));
79 });
80
81 return staticWasmCallingConvention;
82}
83
84} // namespace JSC::Wasm
85
86#endif // ENABLE(B3_JIT)
87