asherkin@263: /*
asherkin@263:  * Copyright (C) 2012 David Anderson
asherkin@263:  *
asherkin@263:  * This file is part of SourcePawn.
asherkin@263:  *
asherkin@263:  * SourcePawn is free software: you can redistribute it and/or modify it under
asherkin@263:  * the terms of the GNU General Public License as published by the Free
asherkin@263:  * Software Foundation, either version 3 of the License, or (at your option)
asherkin@263:  * any later version.
asherkin@263:  * 
asherkin@263:  * SourcePawn is distributed in the hope that it will be useful, but WITHOUT ANY
asherkin@263:  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
asherkin@263:  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
asherkin@263:  *
asherkin@263:  * You should have received a copy of the GNU General Public License along with
asherkin@263:  * SourcePawn. If not, see http://www.gnu.org/licenses/.
asherkin@263:  */
asherkin@263: #include <string.h>
asherkin@263: #include "Utility.h"
asherkin@263: #include "Environments.h"
asherkin@263: #include "Structures.h"
asherkin@263: #include "FixedArray.h"
asherkin@263: #include "Zone.h"
asherkin@263: #include "compiler/NameBinding.h"
asherkin@263: #include "Spaces-inl.h"
asherkin@263: #include "Heap-inl.h"
asherkin@263: 
asherkin@263: using namespace ke;
asherkin@263: 
asherkin@263: EnvironmentSlotDescriptorArray *
asherkin@263: EnvironmentSlotDescriptorArray::New(Zone *zone, unsigned nslots)
asherkin@263: {
asherkin@263:     size_t bytesNeeded = sizeof(EnvironmentSlotDescriptorArray) +
asherkin@263:                          sizeof(EnvironmentSlotDescriptor) * nslots;
asherkin@263: 
asherkin@263:     Local<EnvironmentSlotDescriptorArray> array(zone);
asherkin@263:     Local<Map> map(zone, zone->getMap(MapKind_EnvironmentSlotDescriptorArray));
asherkin@263: 
asherkin@263:     array = EnvironmentSlotDescriptorArray::cast(zone->allocate(map, bytesNeeded, Heap::Tenure_Old));
asherkin@263:     if (!array)
asherkin@263:         return NULL;
asherkin@263: 
asherkin@263:     // We zero the array for safety, since we could GC or fail before initialization.
asherkin@263:     array->length_ = nslots;
asherkin@263:     memset(array->slots(), 0, sizeof(EnvironmentSlotDescriptor) * nslots);
asherkin@263:     return array;
asherkin@263: }
asherkin@263: 
asherkin@263: Environment *
asherkin@263: Environment::New(Zone *zone, Handle<EnvironmentMap> map, Heap::Tenure tenure)
asherkin@263: {
asherkin@263:     size_t bytesNeeded = sizeof(Environment) + map->structureSize();
asherkin@263:     Local<Environment> env(zone, Environment::cast(zone->allocate(map, bytesNeeded, tenure)));
asherkin@263:     if (!env)
asherkin@263:         return NULL;
asherkin@263: 
asherkin@263:     // Initialize when called from C++, to make sure object slots are NULL.
asherkin@263:     memset((Object *)env + 1, 0, map->structureSize());
asherkin@263:     return env;
asherkin@263: }
asherkin@263: 
asherkin@263: #if 0
asherkin@263: EnvironmentMap *
asherkin@263: EnvironmentMap::New(Zone *zone, unsigned nvars, Variable **vars)
asherkin@263: {
asherkin@263:     StructureBufferBuilder structure;
asherkin@263: 
asherkin@263:     Local<EnvironmentSlotDescriptorArray> slots(zone);
asherkin@263:     slots = EnvironmentSlotDescriptorArray::New(zone, nvars);
asherkin@263:     if (!slots)
asherkin@263:         return NULL;
asherkin@263: 
asherkin@263:     // Build the descriptor table, mapping each slot to an offset and type.
asherkin@263:     Local<Type> type(zone);
asherkin@263:     for (unsigned i = 0; i < nvars; i++) {
asherkin@263:         assert(vars[i]->slot() == i);
asherkin@263:         type = vars[i]->type();
asherkin@263: 
asherkin@263:         EnvironmentSlotDescriptor &desc = slots->slots()[i];
asherkin@263:         if (!structure.add(type, &desc.offset))
asherkin@263:             return NULL;
asherkin@263: 
asherkin@263:         desc.type = type;
asherkin@263:     }
asherkin@263: 
asherkin@263:     // Allocate the actual map now.
asherkin@263:     size_t bytesNeeded = sizeof(EnvironmentMap) + structure.traceableOffsetCount() * sizeof(unsigned);
asherkin@263: 
asherkin@263:     Local<EnvironmentMap> map(zone);
asherkin@263:     map = EnvironmentMap::cast(zone->allocateMap(MapKind_Environment, bytesNeeded, MapKind_MetaEnvironment));
asherkin@263:     if (!map)
asherkin@263:         return NULL;
asherkin@263:     
asherkin@263:     // Fill in the map fields, and copy the traceable offsets structure.
asherkin@263:     map->structureSize_ = structure.structureSize();
asherkin@263:     map->traceOffsetCount_ = structure.traceableOffsetCount();
asherkin@263:     map->slots_ = slots;
asherkin@263:     memcpy(const_cast<unsigned *>(map->traceOffsets()), structure.offsets(), sizeof(unsigned) * structure.traceableOffsetCount());
asherkin@263: 
asherkin@263:     return map;
asherkin@263: }
dvander@195: #endif