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 #ifdef V8_ARM_VARIANT_THUMB
32 #include "arm/assembler-thumb2-inl.h"
33 #else
34 #include "arm/assembler-arm-inl.h"
35 #endif
36
37
38 namespace v8 {
39 namespace internal {
40
41
ComputeType(State * state)42 StackFrame::Type StackFrame::ComputeType(State* state) {
43 ASSERT(state->fp != NULL);
44 if (StandardFrame::IsArgumentsAdaptorFrame(state->fp)) {
45 return ARGUMENTS_ADAPTOR;
46 }
47 // The marker and function offsets overlap. If the marker isn't a
48 // smi then the frame is a JavaScript frame -- and the marker is
49 // really the function.
50 const int offset = StandardFrameConstants::kMarkerOffset;
51 Object* marker = Memory::Object_at(state->fp + offset);
52 if (!marker->IsSmi()) return JAVA_SCRIPT;
53 return static_cast<StackFrame::Type>(Smi::cast(marker)->value());
54 }
55
56
GetStateForFramePointer(Address fp,State * state)57 StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) {
58 if (fp == 0) return NONE;
59 // Compute frame type and stack pointer.
60 Address sp = fp + ExitFrameConstants::kSPDisplacement;
61 const int offset = ExitFrameConstants::kCodeOffset;
62 Object* code = Memory::Object_at(fp + offset);
63 bool is_debug_exit = code->IsSmi();
64 if (is_debug_exit) {
65 sp -= kNumJSCallerSaved * kPointerSize;
66 }
67 // Fill in the state.
68 state->sp = sp;
69 state->fp = fp;
70 state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize);
71 return EXIT;
72 }
73
74
Iterate(ObjectVisitor * v) const75 void ExitFrame::Iterate(ObjectVisitor* v) const {
76 v->VisitPointer(&code_slot());
77 // The arguments are traversed as part of the expression stack of
78 // the calling frame.
79 }
80
81
GetProvidedParametersCount() const82 int JavaScriptFrame::GetProvidedParametersCount() const {
83 return ComputeParametersCount();
84 }
85
86
GetCallerStackPointer() const87 Address JavaScriptFrame::GetCallerStackPointer() const {
88 int arguments;
89 if (Heap::gc_state() != Heap::NOT_IN_GC || disable_heap_access_) {
90 // The arguments for cooked frames are traversed as if they were
91 // expression stack elements of the calling frame. The reason for
92 // this rather strange decision is that we cannot access the
93 // function during mark-compact GCs when the stack is cooked.
94 // In fact accessing heap objects (like function->shared() below)
95 // at all during GC is problematic.
96 arguments = 0;
97 } else {
98 // Compute the number of arguments by getting the number of formal
99 // parameters of the function. We must remember to take the
100 // receiver into account (+1).
101 JSFunction* function = JSFunction::cast(this->function());
102 arguments = function->shared()->formal_parameter_count() + 1;
103 }
104 const int offset = StandardFrameConstants::kCallerSPOffset;
105 return fp() + offset + (arguments * kPointerSize);
106 }
107
108
GetCallerStackPointer() const109 Address ArgumentsAdaptorFrame::GetCallerStackPointer() const {
110 const int arguments = Smi::cast(GetExpression(0))->value();
111 const int offset = StandardFrameConstants::kCallerSPOffset;
112 return fp() + offset + (arguments + 1) * kPointerSize;
113 }
114
115
GetCallerStackPointer() const116 Address InternalFrame::GetCallerStackPointer() const {
117 // Internal frames have no arguments. The stack pointer of the
118 // caller is at a fixed offset from the frame pointer.
119 return fp() + StandardFrameConstants::kCallerSPOffset;
120 }
121
122
123 } } // namespace v8::internal
124