dvander@37: /* vim: set ts=4 sw=4 tw=99 et:
dvander@37:  *
dvander@0:  * Copyright (C) 2012 David Anderson
dvander@0:  *
dvander@0:  * This file is part of JITCraft.
dvander@0:  *
dvander@0:  * JITCraft is free software: you can redistribute it and/or modify it under
dvander@0:  * the terms of the GNU General Public License as published by the Free
dvander@0:  * Software Foundation, either version 3 of the License, or (at your option)
dvander@0:  * any later version.
dvander@0:  * 
dvander@0:  * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY
dvander@0:  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
dvander@0:  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
dvander@0:  *
dvander@0:  * You should have received a copy of the GNU General Public License along with
dvander@0:  * JITCraft. If not, see http://www.gnu.org/licenses/.
dvander@0:  */
dvander@195: #include "../Zone.h"
dvander@195: #include "../Types.h"
dvander@195: #include "../TypeManager.h"
dvander@195: #include "../Strings.h"
dvander@195: #include "../Environments.h"
dvander@195: #include "../Structures.h"
dvander@195: #include "CompileContext.h"
dvander@0: #include "Scopes.h"
dvander@195: #include "../Spaces-inl.h"
dvander@195: #include "../Heap-inl.h"
dvander@0: 
dvander@59: using namespace ke;
dvander@0: 
dvander@0: Scope::Scope(PoolAllocator &pool, Kind kind, Scope *enclosing)
dvander@0:   : pool_(pool),
dvander@28:     kind_(kind),
dvander@28:     enclosing_(enclosing)
dvander@0: {
dvander@0: }
dvander@0: 
dvander@0: bool
dvander@0: Scope::initialize()
dvander@0: {
dvander@58:     if (enclosing_ && !enclosing_->children_.append(this))
dvander@58:         return false;
dvander@0:     return true;
dvander@0: }
dvander@0: 
dvander@0: void
dvander@0: Scope::unlink()
dvander@0: {
dvander@0:     assert(empty());
dvander@0: 
dvander@58:     assert(enclosing_->children_[enclosing_->children_.length() - 1] == this);
dvander@58:     enclosing_->children_.pop();
dvander@0: 
dvander@58:     // OOM here is swallowed and checked after compilation.
dvander@58:     // :TODO: make the above true.
dvander@58:     for (size_t i = 0; i < children_.length(); i++)
dvander@58:         enclosing_->children_.append(children_[i]);
dvander@0: }
dvander@0: 
dvander@0: Scope *
dvander@0: Scope::unlinkIfEmpty()
dvander@0: {
dvander@0:     if (empty()) {
dvander@0:         unlink();
dvander@0:         return NULL;
dvander@0:     }
dvander@0:     return this;
dvander@0: }
dvander@0: 
dvander@195: Symbol *
dvander@54: Scope::localLookup(Handle<String> name)
dvander@0: {
dvander@58:     for (size_t i = 0; i < names_.length(); i++) {
dvander@0:         if (names_[i]->name() == name)
dvander@0:             return names_[i];
dvander@0:     }
dvander@0:     return NULL;
dvander@0: }
dvander@0: 
dvander@195: Symbol  *
dvander@54: Scope::lookup(Handle<String> name)
dvander@0: {
dvander@0:     for (Scope *scope = this; scope; scope = scope->enclosing()) {
dvander@195:         if (Symbol *bound = scope->localLookup(name))
dvander@0:             return bound;
dvander@0:     }
dvander@0:     return NULL;
dvander@0: }
dvander@0: 
dvander@195: #if 0
dvander@12: void
dvander@12: Scope::setUsesLifoHeap()
dvander@1: {
dvander@12:     // Only one lifo slot is needed per scope.
dvander@195: #if 0
dvander@12:     if (lifoSlot_)
dvander@12:         return;
dvander@195: #endif
dvander@12: 
dvander@12:     // If the parent of this scope is the function scope, then this is the
dvander@12:     // function's block scope, and the lifo slot is part of the Frame instead.
dvander@16:     // Note we can get a function scope here if we're making a temporary in a
dvander@16:     // function with no local variables.
dvander@16:     if (kind() == FUNCTION || enclosing()->kind() == FUNCTION)
dvander@12:         return;
dvander@12: 
dvander@37:     Local<Type> type(ZONE(), ZONE()->types()->getPrimitive(PrimitiveType_Native));
dvander@37:     if (!type)
dvander@37:         return;
dvander@37: 
dvander@54:     Local<String> name(ZONE());
dvander@195: #if 0
dvander@54:     lifoSlot_ = new (pool_) Variable(this, name, SourcePosition());
dvander@37:     lifoSlot_->setType(type);
dvander@195: #endif
dvander@195: }
dvander@195: #endif
dvander@195: 
dvander@195: bool
dvander@195: Scope::addSymbol(Symbol *sym)
dvander@195: {
dvander@195:     return names_.append(sym);
dvander@195: }
dvander@195: 
dvander@195: LocalScope::LocalScope(PoolAllocator &pool)
dvander@195:   : Scope(pool, Scope::BLOCK, NULL)
dvander@195: {
dvander@195: }
dvander@195: 
dvander@195: LocalScope *
dvander@195: LocalScope::New(PoolAllocator &pool)
dvander@195: {
dvander@195:     LocalScope *scope = new (pool) LocalScope(pool);
dvander@195:     if (!scope->initialize())
dvander@195:         return NULL;
dvander@195: 
dvander@195:     return scope;
dvander@195: }
dvander@195: 
dvander@195: ArgumentScope::ArgumentScope(PoolAllocator &pool)
dvander@195:   : Scope(pool, Scope::FUNCTION, NULL)
dvander@195: {
dvander@195: }
dvander@195: 
dvander@195: ArgumentScope *
dvander@195: ArgumentScope::New(PoolAllocator &pool)
dvander@195: {
dvander@195:     ArgumentScope *scope = new (pool) ArgumentScope(pool);
dvander@195:     if (!scope->initialize())
dvander@195:         return NULL;
dvander@195: 
dvander@195:     return scope;
dvander@195: }
dvander@195: 
dvander@195: GlobalScope::GlobalScope(PoolAllocator &pool, ImportScope *parent)
dvander@195:   : Scope(pool, Scope::GLOBAL, parent)
dvander@195: {
dvander@1: }
dvander@85: 
dvander@195: GlobalScope *
dvander@195: GlobalScope::New(PoolAllocator &pool, ImportScope *parent)
dvander@195: {
dvander@195:     GlobalScope *scope = new (pool) GlobalScope(pool, parent);
dvander@195:     if (!scope->initialize())
dvander@195:         return NULL;
dvander@195: 
dvander@195:     return scope;
dvander@195: }
dvander@195: 
dvander@259: Symbol *
dvander@259: GlobalScope::findExported(Handle<String> name)
dvander@259: {
dvander@259:     for (size_t i = 0; i < exported_.length(); i++) {
dvander@259:         if (exported_[i]->name() == name)
dvander@259:             return exported_[i];
dvander@259:     }
dvander@259:     return NULL;
dvander@259: }
dvander@259: 
dvander@195: ImportScope::ImportScope(PoolAllocator &pool)
dvander@195:   : Scope(pool, Scope::IMPORT, NULL)
dvander@195: {
dvander@195: }
dvander@195: 
dvander@195: ImportScope *
dvander@195: ImportScope::New(PoolAllocator &pool)
dvander@195: {
dvander@195:     ImportScope *scope = new (pool) ImportScope(pool);
dvander@195:     if (!scope->initialize())
dvander@195:         return NULL;
dvander@195: 
dvander@195:     return scope;
dvander@195: }