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1 // Copyright 2010 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 #ifndef V8_VIRTUAL_FRAME_LIGHT_INL_H_ | |
29 #define V8_VIRTUAL_FRAME_LIGHT_INL_H_ | |
30 | |
31 #include "codegen.h" | |
32 #include "register-allocator.h" | |
33 #include "scopes.h" | |
34 #include "type-info.h" | |
35 | |
36 #include "codegen-inl.h" | |
37 #include "jump-target-light-inl.h" | |
38 | |
39 namespace v8 { | |
40 namespace internal { | |
41 | |
42 VirtualFrame::VirtualFrame(InvalidVirtualFrameInitializer* dummy) | |
43 : element_count_(0), | |
44 top_of_stack_state_(NO_TOS_REGISTERS), | |
45 register_allocation_map_(0), | |
46 tos_known_smi_map_(0) { } | |
47 | |
48 | |
49 // On entry to a function, the virtual frame already contains the receiver, | |
50 // the parameters, and a return address. All frame elements are in memory. | |
51 VirtualFrame::VirtualFrame() | |
52 : element_count_(parameter_count() + 2), | |
53 top_of_stack_state_(NO_TOS_REGISTERS), | |
54 register_allocation_map_(0), | |
55 tos_known_smi_map_(0) { } | |
56 | |
57 | |
58 // When cloned, a frame is a deep copy of the original. | |
59 VirtualFrame::VirtualFrame(VirtualFrame* original) | |
60 : element_count_(original->element_count()), | |
61 top_of_stack_state_(original->top_of_stack_state_), | |
62 register_allocation_map_(original->register_allocation_map_), | |
63 tos_known_smi_map_(0) { } | |
64 | |
65 | |
66 bool VirtualFrame::Equals(const VirtualFrame* other) { | |
67 ASSERT(element_count() == other->element_count()); | |
68 if (top_of_stack_state_ != other->top_of_stack_state_) return false; | |
69 if (register_allocation_map_ != other->register_allocation_map_) return false; | |
70 if (tos_known_smi_map_ != other->tos_known_smi_map_) return false; | |
71 | |
72 return true; | |
73 } | |
74 | |
75 | |
76 void VirtualFrame::PrepareForReturn() { | |
77 // Don't bother flushing tos registers as returning does not require more | |
78 // access to the expression stack. | |
79 top_of_stack_state_ = NO_TOS_REGISTERS; | |
80 } | |
81 | |
82 | |
83 VirtualFrame::RegisterAllocationScope::RegisterAllocationScope( | |
84 CodeGenerator* cgen) | |
85 : cgen_(cgen), | |
86 old_is_spilled_( | |
87 Isolate::Current()->is_virtual_frame_in_spilled_scope()) { | |
88 Isolate::Current()->set_is_virtual_frame_in_spilled_scope(false); | |
89 if (old_is_spilled_) { | |
90 VirtualFrame* frame = cgen->frame(); | |
91 if (frame != NULL) { | |
92 frame->AssertIsSpilled(); | |
93 } | |
94 } | |
95 } | |
96 | |
97 | |
98 VirtualFrame::RegisterAllocationScope::~RegisterAllocationScope() { | |
99 Isolate::Current()->set_is_virtual_frame_in_spilled_scope(old_is_spilled_); | |
100 if (old_is_spilled_) { | |
101 VirtualFrame* frame = cgen_->frame(); | |
102 if (frame != NULL) { | |
103 frame->SpillAll(); | |
104 } | |
105 } | |
106 } | |
107 | |
108 | |
109 CodeGenerator* VirtualFrame::cgen() const { | |
110 return CodeGeneratorScope::Current(Isolate::Current()); | |
111 } | |
112 | |
113 | |
114 MacroAssembler* VirtualFrame::masm() { return cgen()->masm(); } | |
115 | |
116 | |
117 void VirtualFrame::CallStub(CodeStub* stub, int arg_count) { | |
118 if (arg_count != 0) Forget(arg_count); | |
119 ASSERT(cgen()->HasValidEntryRegisters()); | |
120 masm()->CallStub(stub); | |
121 } | |
122 | |
123 | |
124 int VirtualFrame::parameter_count() const { | |
125 return cgen()->scope()->num_parameters(); | |
126 } | |
127 | |
128 | |
129 int VirtualFrame::local_count() const { | |
130 return cgen()->scope()->num_stack_slots(); | |
131 } | |
132 | |
133 | |
134 int VirtualFrame::frame_pointer() const { return parameter_count() + 3; } | |
135 | |
136 | |
137 int VirtualFrame::context_index() { return frame_pointer() - 1; } | |
138 | |
139 | |
140 int VirtualFrame::function_index() { return frame_pointer() - 2; } | |
141 | |
142 | |
143 int VirtualFrame::local0_index() const { return frame_pointer() + 2; } | |
144 | |
145 | |
146 int VirtualFrame::fp_relative(int index) { | |
147 ASSERT(index < element_count()); | |
148 ASSERT(frame_pointer() < element_count()); // FP is on the frame. | |
149 return (frame_pointer() - index) * kPointerSize; | |
150 } | |
151 | |
152 | |
153 int VirtualFrame::expression_base_index() const { | |
154 return local0_index() + local_count(); | |
155 } | |
156 | |
157 | |
158 int VirtualFrame::height() const { | |
159 return element_count() - expression_base_index(); | |
160 } | |
161 | |
162 | |
163 MemOperand VirtualFrame::LocalAt(int index) { | |
164 ASSERT(0 <= index); | |
165 ASSERT(index < local_count()); | |
166 return MemOperand(fp, kLocal0Offset - index * kPointerSize); | |
167 } | |
168 | |
169 } } // namespace v8::internal | |
170 | |
171 #endif // V8_VIRTUAL_FRAME_LIGHT_INL_H_ | |
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