| 1 | // Copyright (C) 2022 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0 |
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| 3 | |
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| 4 | #ifndef QQMLJSBASICBLOCKS_P_H |
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| 5 | #define QQMLJSBASICBLOCKS_P_H |
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| 6 | |
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| 7 | // |
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| 8 | // W A R N I N G |
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| 9 | // ------------- |
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| 10 | // |
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| 11 | // This file is not part of the Qt API. It exists purely as an |
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| 12 | // implementation detail. This header file may change from version to |
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| 13 | // version without notice, or even be removed. |
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| 14 | // |
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| 15 | // We mean it. |
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| 16 | |
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| 17 | |
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| 18 | #include <private/qqmljscompilepass_p.h> |
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| 19 | #include <private/qflatmap_p.h> |
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| 20 | |
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| 21 | QT_BEGIN_NAMESPACE |
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| 22 | |
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| 23 | class Q_QMLCOMPILER_PRIVATE_EXPORT QQmlJSBasicBlocks : public QQmlJSCompilePass |
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| 24 | { |
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| 25 | public: |
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| 26 | struct BasicBlock { |
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| 27 | QList<int> jumpOrigins; |
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| 28 | QList<int> readRegisters; |
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| 29 | QList<QQmlJSScope::ConstPtr> readTypes; |
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| 30 | int jumpTarget = -1; |
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| 31 | bool jumpIsUnconditional = false; |
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| 32 | }; |
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| 33 | |
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| 34 | QQmlJSBasicBlocks(const QV4::Compiler::JSUnitGenerator *unitGenerator, |
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| 35 | const QQmlJSTypeResolver *typeResolver, QQmlJSLogger *logger) |
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| 36 | : QQmlJSCompilePass(unitGenerator, typeResolver, logger) |
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| 37 | { |
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| 38 | } |
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| 39 | |
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| 40 | ~QQmlJSBasicBlocks() = default; |
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| 41 | |
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| 42 | InstructionAnnotations run( |
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| 43 | const Function *function, const InstructionAnnotations &annotations, |
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| 44 | QQmlJS::DiagnosticMessage *error); |
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| 45 | |
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| 46 | private: |
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| 47 | struct RegisterAccess |
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| 48 | { |
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| 49 | QList<QQmlJSScope::ConstPtr> trackedTypes; |
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| 50 | QHash<int, QQmlJSScope::ConstPtr> typeReaders; |
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| 51 | QHash<int, QList<int>> registerReadersAndConversions; |
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| 52 | int trackedRegister; |
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| 53 | }; |
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| 54 | |
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| 55 | QV4::Moth::ByteCodeHandler::Verdict startInstruction(QV4::Moth::Instr::Type type) override; |
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| 56 | void endInstruction(QV4::Moth::Instr::Type type) override; |
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| 57 | |
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| 58 | void generate_Jump(int offset) override; |
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| 59 | void generate_JumpTrue(int offset) override; |
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| 60 | void generate_JumpFalse(int offset) override; |
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| 61 | void generate_JumpNoException(int offset) override; |
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| 62 | void generate_JumpNotUndefined(int offset) override; |
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| 63 | |
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| 64 | void generate_Ret() override; |
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| 65 | void generate_ThrowException() override; |
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| 66 | |
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| 67 | void generate_DefineArray(int argc, int argv) override; |
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| 68 | |
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| 69 | enum JumpMode { Unconditional, Conditional }; |
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| 70 | void processJump(int offset, JumpMode mode); |
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| 71 | void populateBasicBlocks(); |
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| 72 | void populateReaderLocations(); |
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| 73 | void adjustTypes(); |
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| 74 | bool canMove(int instructionOffset, const RegisterAccess &access) const; |
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| 75 | |
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| 76 | InstructionAnnotations m_annotations; |
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| 77 | QFlatMap<int, BasicBlock> m_basicBlocks; |
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| 78 | QHash<int, RegisterAccess> m_readerLocations; |
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| 79 | QList<int> m_arrayDefinitions; |
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| 80 | bool m_skipUntilNextLabel = false; |
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| 81 | bool m_hadBackJumps = false; |
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| 82 | }; |
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| 83 | |
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| 84 | QT_END_NAMESPACE |
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| 85 | |
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| 86 | #endif // QQMLJSBASICBLOCKS_P_H |
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| 87 | |
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