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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#ifndef QQMLJSBASICBLOCKS_P_H
#define QQMLJSBASICBLOCKS_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#include <private/qqmljscompilepass_p.h>
#include <private/qflatmap_p.h>
QT_BEGIN_NAMESPACE
class Q_QMLCOMPILER_PRIVATE_EXPORT QQmlJSBasicBlocks : public QQmlJSCompilePass
{
public:
struct BasicBlock {
QList<int> jumpOrigins;
QList<int> readRegisters;
QList<QQmlJSScope::ConstPtr> readTypes;
int jumpTarget = -1;
bool jumpIsUnconditional = false;
};
QQmlJSBasicBlocks(const QV4::Compiler::JSUnitGenerator *unitGenerator,
const QQmlJSTypeResolver *typeResolver, QQmlJSLogger *logger)
: QQmlJSCompilePass(unitGenerator, typeResolver, logger)
{
}
~QQmlJSBasicBlocks() = default;
InstructionAnnotations run(
const Function *function, const InstructionAnnotations &annotations,
QQmlJS::DiagnosticMessage *error);
private:
struct RegisterAccess
{
QList<QQmlJSScope::ConstPtr> trackedTypes;
QHash<int, QQmlJSScope::ConstPtr> typeReaders;
QHash<int, QList<int>> registerReadersAndConversions;
int trackedRegister;
};
QV4::Moth::ByteCodeHandler::Verdict startInstruction(QV4::Moth::Instr::Type type) override;
void endInstruction(QV4::Moth::Instr::Type type) override;
void generate_Jump(int offset) override;
void generate_JumpTrue(int offset) override;
void generate_JumpFalse(int offset) override;
void generate_JumpNoException(int offset) override;
void generate_JumpNotUndefined(int offset) override;
void generate_Ret() override;
void generate_ThrowException() override;
void generate_DefineArray(int argc, int argv) override;
enum JumpMode { Unconditional, Conditional };
void processJump(int offset, JumpMode mode);
void populateBasicBlocks();
void populateReaderLocations();
void adjustTypes();
bool canMove(int instructionOffset, const RegisterAccess &access) const;
InstructionAnnotations m_annotations;
QFlatMap<int, BasicBlock> m_basicBlocks;
QHash<int, RegisterAccess> m_readerLocations;
QList<int> m_arrayDefinitions;
bool m_skipUntilNextLabel = false;
bool m_hadBackJumps = false;
};
QT_END_NAMESPACE
#endif // QQMLJSBASICBLOCKS_P_H
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