sgjesse@chromium.org | df7a284 | 2010-03-25 14:34:15 +0000 | [diff] [blame] | 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 | |
sgjesse@chromium.org | df7a284 | 2010-03-25 14:34:15 +0000 | [diff] [blame] | 37 | DeferredCode::DeferredCode() |
| 38 | : masm_(CodeGeneratorScope::Current()->masm()), |
whesse@chromium.org | f0ac72d | 2010-11-08 12:47:26 +0000 | [diff] [blame] | 39 | statement_position_(masm_->positions_recorder()-> |
| 40 | current_statement_position()), |
| 41 | position_(masm_->positions_recorder()->current_position()), |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 42 | frame_state_(*CodeGeneratorScope::Current()->frame()) { |
sgjesse@chromium.org | df7a284 | 2010-03-25 14:34:15 +0000 | [diff] [blame] | 43 | ASSERT(statement_position_ != RelocInfo::kNoPosition); |
| 44 | ASSERT(position_ != RelocInfo::kNoPosition); |
| 45 | |
| 46 | CodeGeneratorScope::Current()->AddDeferred(this); |
sgjesse@chromium.org | df7a284 | 2010-03-25 14:34:15 +0000 | [diff] [blame] | 47 | |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 48 | #ifdef DEBUG |
ricow@chromium.org | 30ce411 | 2010-05-31 10:38:25 +0000 | [diff] [blame] | 49 | comment_ = ""; |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 50 | #endif |
sgjesse@chromium.org | df7a284 | 2010-03-25 14:34:15 +0000 | [diff] [blame] | 51 | } |
| 52 | |
vegorov@chromium.org | dff694e | 2010-05-17 09:10:26 +0000 | [diff] [blame] | 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 | |
sgjesse@chromium.org | df7a284 | 2010-03-25 14:34:15 +0000 | [diff] [blame] | 111 | } } // namespace v8::internal |