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
ComputeType(State * state)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
GetStateForFramePointer(Address fp,State * state)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
GetProvidedParametersCount() const63 int JavaScriptFrame::GetProvidedParametersCount() const {
64 return ComputeParametersCount();
65 }
66
67
Iterate(ObjectVisitor * v) const68 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
GetCallerStackPointer() const74 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
GetCallerStackPointer() const80 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
GetCallerStackPointer() const102 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