qv4baselineassembler_p.h

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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Qt-Security score:significant
 
#ifndef QV4BASELINEASSEMBLER_P_H
#define QV4BASELINEASSEMBLER_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/qv4global_p.h>
#include <private/qv4function_p.h>
#include <QHash>
 
#if QT_CONFIG(qml_jit)
 
QT_BEGIN_NAMESPACE
 
namespace QV4 {
namespace JIT {
 
#define GENERATE_RUNTIME_CALL(function, destination)
    callRuntime(reinterpret_cast<void *>(&Runtime::function::call),
                destination)
#define GENERATE_TAIL_CALL(function)
    tailCallRuntime(reinterpret_cast<void *>(&function))
 
class BaselineAssembler {
public:
    BaselineAssembler(const Value* constantTable);
    ~BaselineAssembler();
 
    // codegen infrastructure
    void generatePrologue();
    void generateEpilogue();
    void link(Function *function);
    void addLabel(int offset);
 
    // loads/stores/moves
    void loadConst(int constIndex);
    void copyConst(int constIndex, int destReg);
    void loadReg(int reg);
    void moveReg(int sourceReg, int destReg);
    void storeReg(int reg);
    void loadLocal(int index, int level = 0);
    void storeLocal(int index, int level = 0);
    void loadString(int stringId);
    void loadValue(ReturnedValue value);
    void storeHeapObject(int reg);
    void loadImport(int index);
 
    // numeric ops
    void unot();
    void toNumber();
    void uminus();
    void ucompl();
    void inc();
    void dec();
    void add(int lhs);
    void bitAnd(int lhs);
    void bitOr(int lhs);
    void bitXor(int lhs);
    void ushr(int lhs);
    void shr(int lhs);
    void shl(int lhs);
    void bitAndConst(int rhs);
    void bitOrConst(int rhs);
    void bitXorConst(int rhs);
    void ushrConst(int rhs);
    void shrConst(int rhs);
    void shlConst(int rhs);
    void mul(int lhs);
    void div(int lhs);
    void mod(int lhs);
    void sub(int lhs);
 
    // comparissons
    void cmpeqNull();
    void cmpneNull();
    void cmpeqInt(int lhs);
    void cmpneInt(int lhs);
    void cmpeq(int lhs);
    void cmpne(int lhs);
    void cmpgt(int lhs);
    void cmpge(int lhs);
    void cmplt(int lhs);
    void cmple(int lhs);
    void cmpStrictEqual(int lhs);
    void cmpStrictNotEqual(int lhs);
 
    // jumps
    Q_REQUIRED_RESULT int jump(int offset);
    Q_REQUIRED_RESULT int jumpTrue(int offset);
    Q_REQUIRED_RESULT int jumpFalse(int offset);
    Q_REQUIRED_RESULT int jumpNoException(int offset);
    Q_REQUIRED_RESULT int jumpNotUndefined(int offset);
    Q_REQUIRED_RESULT int jumpEqNull(int offset);
 
    // stuff for runtime calls
    void prepareCallWithArgCount(int argc);
    void storeInstructionPointer(int instructionOffset);
    void passAccumulatorAsArg(int arg);
    void passFunctionAsArg(int arg);
    void passEngineAsArg(int arg);
    void passJSSlotAsArg(int reg, int arg);
    void passCppFrameAsArg(int arg);
    void passInt32AsArg(int value, int arg);
    void passPointerAsArg(void *ptr, int arg);
    void callRuntime(const void *funcPtr, CallResultDestination dest);
    void saveAccumulatorInFrame();
    void loadAccumulatorFromFrame();
    void jsTailCall(int func, int thisObject, int argc, int argv);
 
    // exception/context stuff
    void checkException();
    void gotoCatchException();
    void getException();
    void setException();
    Q_REQUIRED_RESULT int setUnwindHandler(int offset);
    void clearUnwindHandler();
    void unwindDispatch();
    Q_REQUIRED_RESULT int unwindToLabel(int level, int offset);
    void pushCatchContext(int index, int name);
    void popContext();
    void deadTemporalZoneCheck(int offsetForSavedIP, int variableName);
 
    // other stuff
    void ret();
 
protected:
    void *d;
 
private:
    typedef unsigned(*CmpFunc)(const Value&,const Value&);
    void cmp(int cond, CmpFunc function, int lhs);
};
 
} // namespace JIT
} // namespace QV4
 
QT_END_NAMESPACE
 
#endif // QT_CONFIG(qml_jit)
 
#endif // QV4BASELINEASSEMBLER_P_H