projects / apple / javascriptcore.git / blame
| Commit | Line | Data |
|---|---|---|
| 81345200 A |
1 | /* |
| 2 | * Copyright (C) 2013 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 | #ifndef MaxFrameExtentForSlowPathCall_h | |
| 27 | #define MaxFrameExtentForSlowPathCall_h | |
| 28 | ||
| 29 | #include "JSStack.h" | |
| 30 | #include "Register.h" | |
| 31 | #include "StackAlignment.h" | |
| 32 | #include <wtf/Assertions.h> | |
| 33 | ||
| 34 | namespace JSC { | |
| 35 | ||
| 36 | // The maxFrameExtentForSlowPathCall is the max amount of stack space (in bytes) | |
| 37 | // that can be used for outgoing args when calling a slow path C function | |
| 38 | // from JS code. | |
| 39 | ||
| 40 | #if !ENABLE(JIT) | |
| 41 | static const size_t maxFrameExtentForSlowPathCall = 0; | |
| 42 | ||
| 43 | #elif CPU(X86_64) && OS(WINDOWS) | |
| 44 | // 4 args in registers, but stack space needs to be allocated for all args. | |
| 45 | static const size_t maxFrameExtentForSlowPathCall = 64; | |
| 46 | ||
| 47 | #elif CPU(X86_64) | |
| 48 | // All args in registers. | |
| 49 | static const size_t maxFrameExtentForSlowPathCall = 0; | |
| 50 | ||
| 51 | #elif CPU(X86) | |
| 52 | // 7 args on stack (28 bytes). | |
| 53 | static const size_t maxFrameExtentForSlowPathCall = 40; | |
| 54 | ||
| 55 | #elif CPU(ARM64) | |
| 56 | // All args in registers. | |
| 57 | static const size_t maxFrameExtentForSlowPathCall = 0; | |
| 58 | ||
| 59 | #elif CPU(ARM) | |
| 60 | // First four args in registers, remaining 4 args on stack. | |
| 61 | static const size_t maxFrameExtentForSlowPathCall = 24; | |
| 62 | ||
| 63 | #elif CPU(SH4) | |
| 64 | // First four args in registers, remaining 4 args on stack. | |
| 65 | static const size_t maxFrameExtentForSlowPathCall = 24; | |
| 66 | ||
| 67 | #elif CPU(MIPS) | |
| 68 | // Though args are in registers, there need to be space on the stack for all args. | |
| 69 | static const size_t maxFrameExtentForSlowPathCall = 40; | |
| 70 | ||
| 71 | #else | |
| 72 | #error "Unsupported CPU: need value for maxFrameExtentForSlowPathCall" | |
| 73 | ||
| 74 | #endif | |
| 75 | ||
| 76 | COMPILE_ASSERT(!(maxFrameExtentForSlowPathCall % sizeof(Register)), extent_must_be_in_multiples_of_registers); | |
| 77 | ||
| 78 | #if ENABLE(JIT) | |
| 79 | // Make sure that cfr - maxFrameExtentForSlowPathCall bytes will make the stack pointer aligned | |
| 80 | COMPILE_ASSERT((maxFrameExtentForSlowPathCall % 16) == 16 - sizeof(CallerFrameAndPC), extent_must_align_stack_from_callframe_pointer); | |
| 81 | #endif | |
| 82 | ||
| 83 | static const size_t maxFrameExtentForSlowPathCallInRegisters = maxFrameExtentForSlowPathCall / sizeof(Register); | |
| 84 | ||
| 85 | } // namespace JSC | |
| 86 | ||
| 87 | #endif // MaxFrameExtentForSlowPathCall_h | |
| 88 |