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Issue 6811012: Remove some dead code. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 9 years, 8 months ago
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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 #include "v8.h"
29
30 #include "codegen-inl.h"
31 #include "jump-target-inl.h"
32
33 namespace v8 {
34 namespace internal {
35
36
37 DeferredCode::DeferredCode()
38 : masm_(CodeGeneratorScope::Current(Isolate::Current())->masm()),
39 statement_position_(masm_->positions_recorder()->
40 current_statement_position()),
41 position_(masm_->positions_recorder()->current_position()),
42 frame_state_(*CodeGeneratorScope::Current(Isolate::Current())->frame()) {
43 ASSERT(statement_position_ != RelocInfo::kNoPosition);
44 ASSERT(position_ != RelocInfo::kNoPosition);
45
46 CodeGeneratorScope::Current(Isolate::Current())->AddDeferred(this);
47
48 #ifdef DEBUG
49 comment_ = "";
50 #endif
51 }
52
53
54 // -------------------------------------------------------------------------
55 // BreakTarget implementation.
56
57
58 void BreakTarget::SetExpectedHeight() {
59 expected_height_ = cgen()->frame()->height();
60 }
61
62
63 void BreakTarget::Jump() {
64 ASSERT(cgen()->has_valid_frame());
65
66 int count = cgen()->frame()->height() - expected_height_;
67 if (count > 0) {
68 cgen()->frame()->Drop(count);
69 }
70 DoJump();
71 }
72
73
74 void BreakTarget::Branch(Condition cc, Hint hint) {
75 if (cc == al) {
76 Jump();
77 return;
78 }
79
80 ASSERT(cgen()->has_valid_frame());
81
82 int count = cgen()->frame()->height() - expected_height_;
83 if (count > 0) {
84 // We negate and branch here rather than using DoBranch's negate
85 // and branch. This gives us a hook to remove statement state
86 // from the frame.
87 JumpTarget fall_through;
88 // Branch to fall through will not negate, because it is a
89 // forward-only target.
90 fall_through.Branch(NegateCondition(cc), NegateHint(hint));
91 // Emit merge code.
92 cgen()->frame()->Drop(count);
93 DoJump();
94 fall_through.Bind();
95 } else {
96 DoBranch(cc, hint);
97 }
98 }
99
100
101 void BreakTarget::Bind() {
102 if (cgen()->has_valid_frame()) {
103 int count = cgen()->frame()->height() - expected_height_;
104 if (count > 0) {
105 cgen()->frame()->Drop(count);
106 }
107 }
108 DoBind();
109 }
110
111 } } // namespace v8::internal
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