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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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Chromium Code Reviews
Issue 6811012:
Remove some dead code. (Closed)
Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge