llint/LLIntThunks.cpp

   1 /*
   2  * Copyright (C) 2012, 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 #include "config.h"
  27 #include "LLIntThunks.h"
  28
  29 #include "CallData.h"
  30 #include "ExceptionHelpers.h"
  31 #include "Interpreter.h"
  32 #include "JSCJSValueInlines.h"
  33 #include "JSInterfaceJIT.h"
  34 #include "JSObject.h"
  35 #include "JSStackInlines.h"
  36 #include "LLIntCLoop.h"
  37 #include "LinkBuffer.h"
  38 #include "LowLevelInterpreter.h"
  39 #include "ProtoCallFrame.h"
  40 #include "StackAlignment.h"
  41 #include "VM.h"
  42
  43 namespace JSC {
  44
  45 #if ENABLE(JIT)
  46
  47 namespace LLInt {
  48
  49 static MacroAssemblerCodeRef generateThunkWithJumpTo(VM* vm, void (*target)(), const char *thunkKind)
  50 {
  51     JSInterfaceJIT jit(vm);
  52
  53     // FIXME: there's probably a better way to do it on X86, but I'm not sure I care.
  54     jit.move(JSInterfaceJIT::TrustedImmPtr(bitwise_cast<void*>(target)), JSInterfaceJIT::regT0);
  55     jit.jump(JSInterfaceJIT::regT0);
  56
  57     LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
  58     return FINALIZE_CODE(patchBuffer, ("LLInt %s prologue thunk", thunkKind));
  59 }
  60
  61 MacroAssemblerCodeRef functionForCallEntryThunkGenerator(VM* vm)
  62 {
  63     return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_function_for_call_prologue), "function for call");
  64 }
  65
  66 MacroAssemblerCodeRef functionForConstructEntryThunkGenerator(VM* vm)
  67 {
  68     return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_function_for_construct_prologue), "function for construct");
  69 }
  70
  71 MacroAssemblerCodeRef functionForCallArityCheckThunkGenerator(VM* vm)
  72 {
  73     return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_function_for_call_arity_check), "function for call with arity check");
  74 }
  75
  76 MacroAssemblerCodeRef functionForConstructArityCheckThunkGenerator(VM* vm)
  77 {
  78     return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_function_for_construct_arity_check), "function for construct with arity check");
  79 }
  80
  81 MacroAssemblerCodeRef evalEntryThunkGenerator(VM* vm)
  82 {
  83     return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_eval_prologue), "eval");
  84 }
  85
  86 MacroAssemblerCodeRef programEntryThunkGenerator(VM* vm)
  87 {
  88     return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_program_prologue), "program");
  89 }
  90
  91 } // namespace LLInt
  92
  93 #else // ENABLE(JIT)
  94
  95 // Non-JIT (i.e. C Loop LLINT) case:
  96
  97 EncodedJSValue vmEntryToJavaScript(void* executableAddress, VM* vm, ProtoCallFrame* protoCallFrame)
  98 {
  99     JSValue result = CLoop::execute(llint_vm_entry_to_javascript, executableAddress, vm, protoCallFrame);
 100     return JSValue::encode(result);
 101 }
 102
 103 EncodedJSValue vmEntryToNative(void* executableAddress, VM* vm, ProtoCallFrame* protoCallFrame)
 104 {
 105     JSValue result = CLoop::execute(llint_vm_entry_to_native, executableAddress, vm, protoCallFrame);
 106     return JSValue::encode(result);
 107 }
 108
 109 extern "C" VMEntryRecord* vmEntryRecord(VMEntryFrame* entryFrame)
 110 {
 111     // The C Loop doesn't have any callee save registers, so the VMEntryRecord is allocated at the base of the frame.
 112     intptr_t stackAlignment = stackAlignmentBytes();
 113     intptr_t VMEntryTotalFrameSize = (sizeof(VMEntryRecord) + (stackAlignment - 1)) & ~(stackAlignment - 1);
 114     return reinterpret_cast<VMEntryRecord*>(static_cast<char*>(entryFrame) - VMEntryTotalFrameSize);
 115 }
 116
 117
 118 #endif // ENABLE(JIT)
 119
 120 } // namespace JSC