1 // Copyright 2006-2008 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 return EXIT; 60 } 61 62 63 void ExitFrame::Iterate(ObjectVisitor* v) const { 64 v->VisitPointer(&code_slot()); 65 // The arguments are traversed as part of the expression stack of 66 // the calling frame. 67 } 68 69 70 int JavaScriptFrame::GetProvidedParametersCount() const { 71 return ComputeParametersCount(); 72 } 73 74 75 Address JavaScriptFrame::GetCallerStackPointer() const { 76 int arguments; 77 if (Heap::gc_state() != Heap::NOT_IN_GC || disable_heap_access_) { 78 // The arguments for cooked frames are traversed as if they were 79 // expression stack elements of the calling frame. The reason for 80 // this rather strange decision is that we cannot access the 81 // function during mark-compact GCs when the stack is cooked. 82 // In fact accessing heap objects (like function->shared() below) 83 // at all during GC is problematic. 84 arguments = 0; 85 } else { 86 // Compute the number of arguments by getting the number of formal 87 // parameters of the function. We must remember to take the 88 // receiver into account (+1). 89 JSFunction* function = JSFunction::cast(this->function()); 90 arguments = function->shared()->formal_parameter_count() + 1; 91 } 92 const int offset = StandardFrameConstants::kCallerSPOffset; 93 return fp() + offset + (arguments * kPointerSize); 94 } 95 96 97 Address ArgumentsAdaptorFrame::GetCallerStackPointer() const { 98 const int arguments = Smi::cast(GetExpression(0))->value(); 99 const int offset = StandardFrameConstants::kCallerSPOffset; 100 return fp() + offset + (arguments + 1) * kPointerSize; 101 } 102 103 104 Address InternalFrame::GetCallerStackPointer() const { 105 // Internal frames have no arguments. The stack pointer of the 106 // caller is at a fixed offset from the frame pointer. 107 return fp() + StandardFrameConstants::kCallerSPOffset; 108 } 109 110 111 } } // namespace v8::internal 112
