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// Copyright 2017 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.
#ifndef V8_INTERPRETER_BLOCK_COVERAGE_BUILDER_H_
#define V8_INTERPRETER_BLOCK_COVERAGE_BUILDER_H_
#include "src/ast/ast-source-ranges.h"
#include "src/interpreter/bytecode-array-builder.h"
#include "src/zone/zone-containers.h"
namespace v8 {
namespace internal {
namespace interpreter {
// Used to generate IncBlockCounter bytecodes and the {source range, slot}
// mapping for block coverage.
class BlockCoverageBuilder final : public ZoneObject {
public:
BlockCoverageBuilder(Zone* zone, BytecodeArrayBuilder* builder,
SourceRangeMap* source_range_map)
: slots_(0, zone),
builder_(builder),
source_range_map_(source_range_map) {
DCHECK_NOT_NULL(builder);
DCHECK_NOT_NULL(source_range_map);
}
static constexpr int kNoCoverageArraySlot = -1;
int AllocateBlockCoverageSlot(ZoneObject* node, SourceRangeKind kind) {
AstNodeSourceRanges* ranges = source_range_map_->Find(node);
if (ranges == nullptr) return kNoCoverageArraySlot;
SourceRange range = ranges->GetRange(kind);
if (range.IsEmpty()) return kNoCoverageArraySlot;
const int slot = static_cast<int>(slots_.size());
slots_.emplace_back(range);
return slot;
}
int AllocateNaryBlockCoverageSlot(NaryOperation* node, size_t index) {
NaryOperationSourceRanges* ranges =
static_cast<NaryOperationSourceRanges*>(source_range_map_->Find(node));
if (ranges == nullptr) return kNoCoverageArraySlot;
SourceRange range = ranges->GetRangeAtIndex(index);
if (range.IsEmpty()) return kNoCoverageArraySlot;
const int slot = static_cast<int>(slots_.size());
slots_.emplace_back(range);
return slot;
}
void IncrementBlockCounter(int coverage_array_slot) {
if (coverage_array_slot == kNoCoverageArraySlot) return;
builder_->IncBlockCounter(coverage_array_slot);
}
void IncrementBlockCounter(ZoneObject* node, SourceRangeKind kind) {
int slot = AllocateBlockCoverageSlot(node, kind);
IncrementBlockCounter(slot);
}
const ZoneVector<SourceRange>& slots() const { return slots_; }
private:
// Contains source range information for allocated block coverage counter
// slots. Slot i covers range slots_[i].
ZoneVector<SourceRange> slots_;
BytecodeArrayBuilder* builder_;
SourceRangeMap* source_range_map_;
};
} // namespace interpreter
} // namespace internal
} // namespace v8
#endif // V8_INTERPRETER_BLOCK_COVERAGE_BUILDER_H_
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