dvander@85: /*
dvander@85:  * Copyright (C) 2012 David Anderson
dvander@85:  *
dvander@195:  * This file is part of SourcePawn.
dvander@85:  *
dvander@195:  * SourcePawn is free software: you can redistribute it and/or modify it under
dvander@85:  * the terms of the GNU General Public License as published by the Free
dvander@85:  * Software Foundation, either version 3 of the License, or (at your option)
dvander@85:  * any later version.
dvander@85:  * 
dvander@195:  * SourcePawn is distributed in the hope that it will be useful, but WITHOUT ANY
dvander@85:  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
dvander@85:  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
dvander@85:  *
dvander@85:  * You should have received a copy of the GNU General Public License along with
dvander@195:  * SourcePawn. If not, see http://www.gnu.org/licenses/.
dvander@85:  */
danderson@92: #include <string.h>
dvander@85: #include "Utility.h"
dvander@85: #include "Environments.h"
dvander@85: #include "Structures.h"
dvander@85: #include "FixedArray.h"
dvander@85: #include "Zone.h"
dvander@195: #include "compiler/NameBinding.h"
danderson@92: #include "Spaces-inl.h"
danderson@92: #include "Heap-inl.h"
dvander@85: 
dvander@85: using namespace ke;
dvander@85: 
dvander@85: EnvironmentSlotDescriptorArray *
dvander@85: EnvironmentSlotDescriptorArray::New(Zone *zone, unsigned nslots)
dvander@85: {
dvander@85:     size_t bytesNeeded = sizeof(EnvironmentSlotDescriptorArray) +
dvander@85:                          sizeof(EnvironmentSlotDescriptor) * nslots;
dvander@85: 
dvander@85:     Local<EnvironmentSlotDescriptorArray> array(zone);
dvander@85:     Local<Map> map(zone, zone->getMap(MapKind_EnvironmentSlotDescriptorArray));
dvander@85: 
dvander@85:     array = EnvironmentSlotDescriptorArray::cast(zone->allocate(map, bytesNeeded, Heap::Tenure_Old));
dvander@85:     if (!array)
dvander@85:         return NULL;
dvander@85: 
dvander@85:     // We zero the array for safety, since we could GC or fail before initialization.
dvander@85:     array->length_ = nslots;
dvander@85:     memset(array->slots(), 0, sizeof(EnvironmentSlotDescriptor) * nslots);
dvander@85:     return array;
dvander@85: }
dvander@85: 
dvander@85: Environment *
dvander@85: Environment::New(Zone *zone, Handle<EnvironmentMap> map, Heap::Tenure tenure)
dvander@85: {
dvander@85:     size_t bytesNeeded = sizeof(Environment) + map->structureSize();
dvander@85:     Local<Environment> env(zone, Environment::cast(zone->allocate(map, bytesNeeded, tenure)));
dvander@85:     if (!env)
dvander@85:         return NULL;
dvander@85: 
dvander@85:     // Initialize when called from C++, to make sure object slots are NULL.
dvander@85:     memset((Object *)env + 1, 0, map->structureSize());
dvander@85:     return env;
dvander@85: }
dvander@85: 
dvander@195: #if 0
dvander@85: EnvironmentMap *
dvander@85: EnvironmentMap::New(Zone *zone, unsigned nvars, Variable **vars)
dvander@85: {
dvander@85:     StructureBufferBuilder structure;
dvander@85: 
dvander@85:     Local<EnvironmentSlotDescriptorArray> slots(zone);
dvander@85:     slots = EnvironmentSlotDescriptorArray::New(zone, nvars);
dvander@85:     if (!slots)
dvander@85:         return NULL;
dvander@85: 
dvander@85:     // Build the descriptor table, mapping each slot to an offset and type.
dvander@85:     Local<Type> type(zone);
dvander@85:     for (unsigned i = 0; i < nvars; i++) {
dvander@85:         assert(vars[i]->slot() == i);
dvander@85:         type = vars[i]->type();
dvander@85: 
dvander@85:         EnvironmentSlotDescriptor &desc = slots->slots()[i];
dvander@85:         if (!structure.add(type, &desc.offset))
dvander@85:             return NULL;
dvander@85: 
dvander@85:         desc.type = type;
dvander@85:     }
dvander@85: 
dvander@85:     // Allocate the actual map now.
dvander@85:     size_t bytesNeeded = sizeof(EnvironmentMap) + structure.traceableOffsetCount() * sizeof(unsigned);
dvander@147: 
dvander@85:     Local<EnvironmentMap> map(zone);
dvander@85:     map = EnvironmentMap::cast(zone->allocateMap(MapKind_Environment, bytesNeeded, MapKind_MetaEnvironment));
dvander@85:     if (!map)
dvander@85:         return NULL;
dvander@85:     
dvander@85:     // Fill in the map fields, and copy the traceable offsets structure.
dvander@85:     map->structureSize_ = structure.structureSize();
dvander@85:     map->traceOffsetCount_ = structure.traceableOffsetCount();
dvander@85:     map->slots_ = slots;
dvander@85:     memcpy(const_cast<unsigned *>(map->traceOffsets()), structure.offsets(), sizeof(unsigned) * structure.traceableOffsetCount());
dvander@85: 
dvander@85:     return map;
dvander@85: }
dvander@195: #endif