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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/builtins/constants-table-builder.h"
#include "src/heap/heap-inl.h"
namespace v8 {
namespace internal {
BuiltinsConstantsTableBuilder::BuiltinsConstantsTableBuilder(Isolate* isolate)
: isolate_(isolate), map_(isolate->heap()) {
// Ensure this is only called once per Isolate.
DCHECK_EQ(isolate_->heap()->empty_fixed_array(),
isolate_->heap()->builtins_constants_table());
// And that the initial value of the builtins constants table can be treated
// as a constant, which means that codegen will load it using the root
// register.
DCHECK(isolate_->heap()->RootCanBeTreatedAsConstant(
Heap::kEmptyFixedArrayRootIndex));
}
uint32_t BuiltinsConstantsTableBuilder::AddObject(Handle<Object> object) {
#ifdef DEBUG
// Roots must not be inserted into the constants table as they are already
// accessibly from the root list.
Heap::RootListIndex root_list_index;
DCHECK(!isolate_->heap()->IsRootHandle(object, &root_list_index));
// Not yet finalized.
DCHECK_EQ(isolate_->heap()->empty_fixed_array(),
isolate_->heap()->builtins_constants_table());
#endif
uint32_t* maybe_key = map_.Find(object);
if (maybe_key == nullptr) {
uint32_t index = map_.size();
map_.Set(object, index);
return index;
} else {
return *maybe_key;
}
}
void BuiltinsConstantsTableBuilder::Finalize() {
HandleScope handle_scope(isolate_);
DCHECK_EQ(isolate_->heap()->empty_fixed_array(),
isolate_->heap()->builtins_constants_table());
DCHECK_LT(0, map_.size());
Handle<FixedArray> table =
isolate_->factory()->NewFixedArray(map_.size(), TENURED);
Builtins* builtins = isolate_->builtins();
ConstantsMap::IteratableScope it_scope(&map_);
for (auto it = it_scope.begin(); it != it_scope.end(); ++it) {
uint32_t index = *it.entry();
Object* value = it.key();
if (value->IsCode() && Code::cast(value)->kind() == Code::BUILTIN) {
// Replace placeholder code objects with the real builtin.
// See also: SetupIsolateDelegate::PopulateWithPlaceholders.
// TODO(jgruber): Deduplicate placeholders and their corresponding
// builtin.
value = builtins->builtin(Code::cast(value)->builtin_index());
}
table->set(index, value);
}
#ifdef DEBUG
for (int i = 0; i < map_.size(); i++) {
DCHECK(table->get(i)->IsHeapObject());
DCHECK_NE(isolate_->heap()->undefined_value(), table->get(i));
}
#endif
isolate_->heap()->SetBuiltinsConstantsTable(*table);
}
} // namespace internal
} // namespace v8
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