| // Copyright 2006-2008 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #include "ast.h" |
| #include "scopes.h" |
| #include "variables.h" |
| |
| namespace v8 { namespace internal { |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation UseCount. |
| |
| UseCount::UseCount() |
| : nreads_(0), |
| nwrites_(0) { |
| } |
| |
| |
| void UseCount::RecordRead(int weight) { |
| ASSERT(weight > 0); |
| nreads_ += weight; |
| // We must have a positive nreads_ here. Handle |
| // any kind of overflow by setting nreads_ to |
| // some large-ish value. |
| if (nreads_ <= 0) nreads_ = 1000000; |
| ASSERT(is_read() & is_used()); |
| } |
| |
| |
| void UseCount::RecordWrite(int weight) { |
| ASSERT(weight > 0); |
| nwrites_ += weight; |
| // We must have a positive nwrites_ here. Handle |
| // any kind of overflow by setting nwrites_ to |
| // some large-ish value. |
| if (nwrites_ <= 0) nwrites_ = 1000000; |
| ASSERT(is_written() && is_used()); |
| } |
| |
| |
| void UseCount::RecordAccess(int weight) { |
| RecordRead(weight); |
| RecordWrite(weight); |
| } |
| |
| |
| void UseCount::RecordUses(UseCount* uses) { |
| if (uses->nreads() > 0) RecordRead(uses->nreads()); |
| if (uses->nwrites() > 0) RecordWrite(uses->nwrites()); |
| } |
| |
| |
| #ifdef DEBUG |
| void UseCount::Print() { |
| // PrintF("r = %d, w = %d", nreads_, nwrites_); |
| PrintF("%du = %dr + %dw", nuses(), nreads(), nwrites()); |
| } |
| #endif |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation SmiAnalysis. |
| |
| |
| const char* SmiAnalysis::Type2String(SmiAnalysis* type) { |
| switch (type->kind_) { |
| case UNKNOWN: |
| return "UNKNOWN"; |
| case LIKELY_SMI: |
| return "LIKELY_SMI"; |
| default: |
| UNREACHABLE(); |
| } |
| return "UNREACHABLE"; |
| } |
| |
| |
| // ---------------------------------------------------------------------------- |
| // Implementation Variable. |
| |
| |
| const char* Variable::Mode2String(Mode mode) { |
| switch (mode) { |
| case VAR: return "VAR"; |
| case CONST: return "CONST"; |
| case DYNAMIC: return "DYNAMIC"; |
| case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL"; |
| case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL"; |
| case INTERNAL: return "INTERNAL"; |
| case TEMPORARY: return "TEMPORARY"; |
| } |
| UNREACHABLE(); |
| return NULL; |
| } |
| |
| |
| Property* Variable::AsProperty() { |
| return rewrite_ == NULL ? NULL : rewrite_->AsProperty(); |
| } |
| |
| |
| Variable* Variable::AsVariable() { |
| return rewrite_ == NULL || rewrite_->AsSlot() != NULL ? this : NULL; |
| } |
| |
| |
| Slot* Variable::slot() const { |
| return rewrite_ != NULL ? rewrite_->AsSlot() : NULL; |
| } |
| |
| |
| Variable::Variable(Scope* scope, |
| Handle<String> name, |
| Mode mode, |
| bool is_valid_LHS, |
| bool is_this) |
| : scope_(scope), |
| name_(name), |
| mode_(mode), |
| is_valid_LHS_(is_valid_LHS), |
| is_this_(is_this), |
| local_if_not_shadowed_(NULL), |
| is_accessed_from_inner_scope_(false), |
| rewrite_(NULL) { |
| // names must be canonicalized for fast equality checks |
| ASSERT(name->IsSymbol()); |
| } |
| |
| |
| bool Variable::is_global() const { |
| // Temporaries are never global, they must always be allocated in the |
| // activation frame. |
| return mode_ != TEMPORARY && scope_ != NULL && scope_->is_global_scope(); |
| } |
| |
| } } // namespace v8::internal |