V4: Add a baseline JIT

This patch add a JIT back in for all platforms that supported JITting
before, with the exception of MIPS.

Change-Id: I51bc5ce3a2ac40e0510bd72a563af897c5b60343
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 188 insertions, 0 deletions

diff --git a/src/qml/jit/qv4assembler_p.h b/src/qml/jit/qv4assembler_p.h
new file mode 100644
index 0000000000..eafe27c8bb
--- /dev/null
+++ b/src/qml/jit/qv4assembler_p.h
@@ -0,0 +1,188 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QV4ASSEMBLER_P_H
+#define QV4ASSEMBLER_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>
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+namespace JIT {
+
+#define JIT_STRINGIFYx(s) #s
+#define JIT_STRINGIFY(s) JIT_STRINGIFYx(s)
+
+#define IN_JIT_GENERATE_RUNTIME_CALL(function, destination) \
+    callRuntime(JIT_STRINGIFY(function), \
+                reinterpret_cast<void *>(&function), \
+                destination)
+#define JIT_GENERATE_RUNTIME_CALL(function, destination) \
+    as->IN_JIT_GENERATE_RUNTIME_CALL(function, destination)
+
+class Assembler {
+public:
+    enum CallResultDestination {
+        IgnoreResult,
+        ResultInAccumulator,
+    };
+
+    Assembler(const Value* constantTable);
+    ~Assembler();
+
+    // 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 storeReg(int reg);
+    void loadString(int stringId);
+    void loadValue(ReturnedValue value);
+
+    // 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
+    void jump(int offset);
+    void jumpTrue(int offset);
+    void jumpFalse(int offset);
+    void jumpStrictEqualStackSlotInt(int lhs, int rhs, int offset);
+    void jumpStrictNotEqualStackSlotInt(int lhs, int rhs, 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 passRegAsArg(int reg, int arg);
+    void passCppFrameAsArg(int arg);
+    void passInt32AsArg(int value, int arg);
+    void callRuntime(const char *functionName, const void *funcPtr, Assembler::CallResultDestination dest);
+    void saveAccumulatorInFrame();
+
+    // exception/context stuff
+    void checkException();
+    void gotoCatchException();
+    void getException();
+    void setException();
+    void setExceptionHandler(int offset);
+    void clearExceptionHandler();
+    void pushCatchContext(int name, int reg);
+    void popContext(int reg);
+
+    // other stuff
+    void ret();
+
+protected:
+    void *d;
+
+#ifndef QT_NO_DEBUG
+    enum { NoCall = -1 };
+    int remainingArgcForCall = NoCall;
+#endif
+    int argcOnStackForCall = 0;
+
+private:
+    typedef unsigned(*CmpFunc)(const Value&,const Value&);
+    void cmp(int cond, CmpFunc function, const char *functionName, int lhs);
+    void passAccumulatorAsArg_internal(int arg, bool push);
+};
+
+} // namespace JIT
+} // namespace QV4
+
+QT_END_NAMESPACE
+
+#endif // QV4ASSEMBLER_P_H