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  
33  namespace JSC::Wasm {
34  
35  const 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  
49  const 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)