frames-ia32.cc revision f7060e27768c550ace7ec48ad8c093466db52dfa 
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#if defined(V8_TARGET_ARCH_IA32)
31
32#include "frames-inl.h"
33
34namespace v8 {
35namespace internal {
36
37
38StackFrame::Type StackFrame::ComputeType(State* state) {
39  ASSERT(state->fp != NULL);
40  if (StandardFrame::IsArgumentsAdaptorFrame(state->fp)) {
41    return ARGUMENTS_ADAPTOR;
42  }
43  // The marker and function offsets overlap. If the marker isn't a
44  // smi then the frame is a JavaScript frame -- and the marker is
45  // really the function.
46  const int offset = StandardFrameConstants::kMarkerOffset;
47  Object* marker = Memory::Object_at(state->fp + offset);
48  if (!marker->IsSmi()) return JAVA_SCRIPT;
49  return static_cast<StackFrame::Type>(Smi::cast(marker)->value());
50}
51
52
53StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) {
54  if (fp == 0) return NONE;
55  // Compute the stack pointer.
56  Address sp = Memory::Address_at(fp + ExitFrameConstants::kSPOffset);
57  // Fill in the state.
58  state->fp = fp;
59  state->sp = sp;
60  state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize);
61  return EXIT;
62}
63
64
65void ExitFrame::Iterate(ObjectVisitor* v) const {
66  v->VisitPointer(&code_slot());
67  // The arguments are traversed as part of the expression stack of
68  // the calling frame.
69}
70
71
72int JavaScriptFrame::GetProvidedParametersCount() const {
73  return ComputeParametersCount();
74}
75
76
77Address JavaScriptFrame::GetCallerStackPointer() const {
78  int arguments;
79  if (Heap::gc_state() != Heap::NOT_IN_GC || disable_heap_access_) {
80    // The arguments for cooked frames are traversed as if they were
81    // expression stack elements of the calling frame. The reason for
82    // this rather strange decision is that we cannot access the
83    // function during mark-compact GCs when the stack is cooked.
84    // In fact accessing heap objects (like function->shared() below)
85    // at all during GC is problematic.
86    arguments = 0;
87  } else {
88    // Compute the number of arguments by getting the number of formal
89    // parameters of the function. We must remember to take the
90    // receiver into account (+1).
91    JSFunction* function = JSFunction::cast(this->function());
92    arguments = function->shared()->formal_parameter_count() + 1;
93  }
94  const int offset = StandardFrameConstants::kCallerSPOffset;
95  return fp() + offset + (arguments * kPointerSize);
96}
97
98
99Address ArgumentsAdaptorFrame::GetCallerStackPointer() const {
100  const int arguments = Smi::cast(GetExpression(0))->value();
101  const int offset = StandardFrameConstants::kCallerSPOffset;
102  return fp() + offset + (arguments + 1) * kPointerSize;
103}
104
105
106Address InternalFrame::GetCallerStackPointer() const {
107  // Internal frames have no arguments. The stack pointer of the
108  // caller is at a fixed offset from the frame pointer.
109  return fp() + StandardFrameConstants::kCallerSPOffset;
110}
111
112
113} }  // namespace v8::internal
114
115#endif  // V8_TARGET_ARCH_IA32
116