Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame^] | 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 | // Determine frame type. |
| 60 | if (Memory::Address_at(fp + ExitFrameConstants::kDebugMarkOffset) != 0) { |
| 61 | return EXIT_DEBUG; |
| 62 | } else { |
| 63 | return EXIT; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | |
| 68 | void ExitFrame::Iterate(ObjectVisitor* v) const { |
| 69 | // Exit frames on IA-32 do not contain any pointers. The arguments |
| 70 | // are traversed as part of the expression stack of the calling |
| 71 | // frame. |
| 72 | } |
| 73 | |
| 74 | |
| 75 | int JavaScriptFrame::GetProvidedParametersCount() const { |
| 76 | return ComputeParametersCount(); |
| 77 | } |
| 78 | |
| 79 | |
| 80 | Address 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 | Address 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 | Address InternalFrame::GetCallerStackPointer() const { |
| 110 | // Internal frames have no arguments. The stack pointer of the |
| 111 | // caller is at a fixed offset from the frame pointer. |
| 112 | return fp() + StandardFrameConstants::kCallerSPOffset; |
| 113 | } |
| 114 | |
| 115 | |
| 116 | } } // namespace v8::internal |