1 // Copyright 2009 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #include "v8.h" 29 30 #include "frames-inl.h" 31 32 namespace v8 { 33 namespace internal { 34 35 36 StackFrame::Type StackFrame::ComputeType(State* state) { 37 ASSERT(state->fp != NULL); 38 if (StandardFrame::IsArgumentsAdaptorFrame(state->fp)) { 39 return ARGUMENTS_ADAPTOR; 40 } 41 // The marker and function offsets overlap. If the marker isn't a 42 // smi then the frame is a JavaScript frame -- and the marker is 43 // really the function. 44 const int offset = StandardFrameConstants::kMarkerOffset; 45 Object* marker = Memory::Object_at(state->fp + offset); 46 if (!marker->IsSmi()) return JAVA_SCRIPT; 47 return static_cast<StackFrame::Type>(Smi::cast(marker)->value()); 48 } 49 50 51 StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) { 52 if (fp == 0) return NONE; 53 // Compute the stack pointer. 54 Address sp = Memory::Address_at(fp + ExitFrameConstants::kSPOffset); 55 // Fill in the state. 56 state->fp = fp; 57 state->sp = sp; 58 state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize); 59 // Determine frame type. 60 return EXIT; 61 } 62 63 int JavaScriptFrame::GetProvidedParametersCount() const { 64 return ComputeParametersCount(); 65 } 66 67 68 void ExitFrame::Iterate(ObjectVisitor* v) const { 69 v->VisitPointer(&code_slot()); 70 // The arguments are traversed as part of the expression stack of 71 // the calling frame. 72 } 73 74 byte* InternalFrame::GetCallerStackPointer() const { 75 // Internal frames have no arguments. The stack pointer of the 76 // caller is at a fixed offset from the frame pointer. 77 return fp() + StandardFrameConstants::kCallerSPOffset; 78 } 79 80 byte* JavaScriptFrame::GetCallerStackPointer() const { 81 int arguments; 82 if (Heap::gc_state() != Heap::NOT_IN_GC || disable_heap_access_) { 83 // The arguments for cooked frames are traversed as if they were 84 // expression stack elements of the calling frame. The reason for 85 // this rather strange decision is that we cannot access the 86 // function during mark-compact GCs when the stack is cooked. 87 // In fact accessing heap objects (like function->shared() below) 88 // at all during GC is problematic. 89 arguments = 0; 90 } else { 91 // Compute the number of arguments by getting the number of formal 92 // parameters of the function. We must remember to take the 93 // receiver into account (+1). 94 JSFunction* function = JSFunction::cast(this->function()); 95 arguments = function->shared()->formal_parameter_count() + 1; 96 } 97 const int offset = StandardFrameConstants::kCallerSPOffset; 98 return fp() + offset + (arguments * kPointerSize); 99 } 100 101 102 byte* ArgumentsAdaptorFrame::GetCallerStackPointer() const { 103 const int arguments = Smi::cast(GetExpression(0))->value(); 104 const int offset = StandardFrameConstants::kCallerSPOffset; 105 return fp() + offset + (arguments + 1) * kPointerSize; 106 } 107 108 109 } } // namespace v8::internal 110
