/*

 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifdef CC_INTERP

// CVM definitions find hotspot equivalents...

union VMJavaVal64 {

    jlong   l;

    jdouble d;

    uint32_t      v[2];

};

typedef class BytecodeInterpreter* interpreterState;

struct call_message {

    class methodOopDesc* _callee;    /* method to call during call_method request */

    address   _callee_entry_point;   /* address to jump to for call_method request */

    int       _bcp_advance;          /* size of the invoke bytecode operation */

};

struct osr_message {

    address _osr_buf;                 /* the osr buffer */

    address _osr_entry;               /* the entry to the osr method */

};

struct osr_result {

  nmethod* nm;                       /* osr nmethod */

  address return_addr;               /* osr blob return address */

};

// Result returned to frame manager

union frame_manager_message {

    call_message _to_call;            /* describes callee */

    Bytecodes::Code _return_kind;     /* i_return, a_return, ... */

    osr_message _osr;                 /* describes the osr */

    osr_result _osr_result;           /* result of OSR request */

};

class BytecodeInterpreter : StackObj {

friend class SharedRuntime;

friend class AbstractInterpreterGenerator;

friend class CppInterpreterGenerator;

friend class InterpreterGenerator;

friend class InterpreterMacroAssembler;

friend class frame;

friend class VMStructs;

public:

    enum messages {

         no_request = 0,            // unused

         initialize,                // Perform one time interpreter initializations (assumes all switches set)

         // status message to C++ interpreter

         method_entry,              // initial method entry to interpreter

         method_resume,             // frame manager response to return_from_method request (assuming a frame to resume)

         deopt_resume,              // returning from a native call into a deopted frame

         deopt_resume2,             // deopt resume as a result of a PopFrame

         got_monitors,              // frame manager response to more_monitors request

         rethrow_exception,         // unwinding and throwing exception

         // requests to frame manager from C++ interpreter

         call_method,               // request for new frame from interpreter, manager responds with method_entry

         return_from_method,        // request from interpreter to unwind, manager responds with method_continue

         more_monitors,             // need a new monitor

         throwing_exception,        // unwind stack and rethrow

         popping_frame,             // unwind call and retry call

         do_osr                     // request this invocation be OSR's

    };

private:

    JavaThread*           _thread;        // the vm's java thread pointer

    address               _bcp;           // instruction pointer

    intptr_t*             _locals;        // local variable pointer

    constantPoolCacheOop  _constants;     // constant pool cache

    methodOop             _method;        // method being executed

    DataLayout*           _mdx;           // compiler profiling data for current bytecode

    intptr_t*             _stack;         // expression stack

    messages              _msg;           // frame manager <-> interpreter message

    frame_manager_message _result;        // result to frame manager

    interpreterState      _prev_link;     // previous interpreter state

    oop                   _oop_temp;      // mirror for interpreted native, null otherwise

    intptr_t*             _stack_base;    // base of expression stack

    intptr_t*             _stack_limit;   // limit of expression stack

    BasicObjectLock*      _monitor_base;  // base of monitors on the native stack

public:

  // Constructor is only used by the initialization step. All other instances are created

  // by the frame manager.

  BytecodeInterpreter(messages msg);

//

// Deoptimization support

//

static void layout_interpreterState(interpreterState to_fill,

                                    frame* caller,

                                    frame* interpreter_frame,

                                    methodOop method,

                                    intptr_t* locals,

                                    intptr_t* stack,

                                    intptr_t* stack_base,

                                    intptr_t* monitor_base,

                                    intptr_t* frame_bottom,

                                    bool top_frame);

/*

 * Generic 32-bit wide "Java slot" definition. This type occurs

 * in operand stacks, Java locals, object fields, constant pools.

 */

union VMJavaVal32 {

    jint     i;

    jfloat   f;

    class oopDesc*   r;

    uint32_t raw;

};

/*

 * Generic 64-bit Java value definition

 */

union VMJavaVal64 {

    jlong   l;

    jdouble d;

    uint32_t      v[2];

};

/*

 * Generic 32-bit wide "Java slot" definition. This type occurs

 * in Java locals, object fields, constant pools, and

 * operand stacks (as a CVMStackVal32).

 */

typedef union VMSlotVal32 {

    VMJavaVal32    j;     /* For "Java" values */

    address        a;     /* a return created by jsr or jsr_w */

} VMSlotVal32;

/*

 * Generic 32-bit wide stack slot definition.

 */

union VMStackVal32 {

    VMJavaVal32    j;     /* For "Java" values */

    VMSlotVal32    s;     /* any value from a "slot" or locals[] */

};

inline JavaThread* thread() { return _thread; }

inline address bcp() { return _bcp; }

inline void set_bcp(address new_bcp) { _bcp = new_bcp; }

inline intptr_t* locals() { return _locals; }

inline constantPoolCacheOop constants() { return _constants; }

inline methodOop method() { return _method; }

inline DataLayout* mdx() { return _mdx; }

inline void set_mdx(DataLayout *new_mdx) { _mdx = new_mdx; }

inline messages msg() { return _msg; }

inline void set_msg(messages new_msg) { _msg = new_msg; }

inline methodOop callee() { return _result._to_call._callee; }

inline void set_callee(methodOop new_callee) { _result._to_call._callee = new_callee; }

inline void set_callee_entry_point(address entry) { _result._to_call._callee_entry_point = entry; }

inline void set_osr_buf(address buf) { _result._osr._osr_buf = buf; }

inline void set_osr_entry(address entry) { _result._osr._osr_entry = entry; }

inline int bcp_advance() { return _result._to_call._bcp_advance; }

inline void set_bcp_advance(int count) { _result._to_call._bcp_advance = count; }

inline void set_return_kind(Bytecodes::Code kind) { _result._return_kind = kind; }

inline interpreterState prev() { return _prev_link; }

inline intptr_t* stack() { return _stack; }

inline void set_stack(intptr_t* new_stack) { _stack = new_stack; }

inline intptr_t* stack_base() { return _stack_base; }

inline intptr_t* stack_limit() { return _stack_limit; }

inline BasicObjectLock* monitor_base() { return _monitor_base; }

/*

 * 64-bit Arithmetic:

 *

 * The functions below follow the semantics of the

 * ladd, land, ldiv, lmul, lor, lxor, and lrem bytecodes,

 * respectively.

 */

static jlong VMlongAdd(jlong op1, jlong op2);

static jlong VMlongAnd(jlong op1, jlong op2);

static jlong VMlongDiv(jlong op1, jlong op2);

static jlong VMlongMul(jlong op1, jlong op2);

static jlong VMlongOr (jlong op1, jlong op2);

static jlong VMlongSub(jlong op1, jlong op2);

static jlong VMlongXor(jlong op1, jlong op2);

static jlong VMlongRem(jlong op1, jlong op2);

/*

 * Shift:

 *

 * The functions below follow the semantics of the

 * lushr, lshl, and lshr bytecodes, respectively.

 */

static jlong VMlongUshr(jlong op1, jint op2);

static jlong VMlongShl (jlong op1, jint op2);

static jlong VMlongShr (jlong op1, jint op2);

/*

 * Unary:

 *

 * Return the negation of "op" (-op), according to

 * the semantics of the lneg bytecode.

 */

static jlong VMlongNeg(jlong op);

/*

 * Return the complement of "op" (~op)

 */

static jlong VMlongNot(jlong op);

/*

 * Comparisons to 0:

 */

static int32_t VMlongLtz(jlong op);     /* op <= 0 */

static int32_t VMlongGez(jlong op);     /* op >= 0 */

static int32_t VMlongEqz(jlong op);     /* op == 0 */

/*

 * Between operands:

 */

static int32_t VMlongEq(jlong op1, jlong op2);    /* op1 == op2 */

static int32_t VMlongNe(jlong op1, jlong op2);    /* op1 != op2 */

static int32_t VMlongGe(jlong op1, jlong op2);    /* op1 >= op2 */

static int32_t VMlongLe(jlong op1, jlong op2);    /* op1 <= op2 */

static int32_t VMlongLt(jlong op1, jlong op2);    /* op1 <  op2 */

static int32_t VMlongGt(jlong op1, jlong op2);    /* op1 >  op2 */

/*

 * Comparisons (returning an jint value: 0, 1, or -1)

 *

 * Between operands:

 *

 * Compare "op1" and "op2" according to the semantics of the

 * "lcmp" bytecode.

 */

static int32_t VMlongCompare(jlong op1, jlong op2);

/*

 * Convert int to long, according to "i2l" bytecode semantics

 */

static jlong VMint2Long(jint val);

/*

 * Convert long to int, according to "l2i" bytecode semantics

 */

static jint VMlong2Int(jlong val);

/*

 * Convert long to float, according to "l2f" bytecode semantics

 */

static jfloat VMlong2Float(jlong val);

/*

 * Convert long to double, according to "l2d" bytecode semantics

 */

static jdouble VMlong2Double(jlong val);

/*

 * Java floating-point float value manipulation.

 *

 * The result argument is, once again, an lvalue.

 *

 * Arithmetic:

 *

 * The functions below follow the semantics of the

 * fadd, fsub, fmul, fdiv, and frem bytecodes,

 * respectively.

 */

static jfloat VMfloatAdd(jfloat op1, jfloat op2);

static jfloat VMfloatSub(jfloat op1, jfloat op2);

static jfloat VMfloatMul(jfloat op1, jfloat op2);

static jfloat VMfloatDiv(jfloat op1, jfloat op2);

static jfloat VMfloatRem(jfloat op1, jfloat op2);

/*

 * Unary:

 *

 * Return the negation of "op" (-op), according to

 * the semantics of the fneg bytecode.

 */

static jfloat VMfloatNeg(jfloat op);

/*

 * Comparisons (returning an int value: 0, 1, or -1)

 *

 * Between operands:

 *

 * Compare "op1" and "op2" according to the semantics of the

 * "fcmpl" (direction is -1) or "fcmpg" (direction is 1) bytecodes.

 */

static int32_t VMfloatCompare(jfloat op1, jfloat op2,

                              int32_t direction);

/*

 * Conversion:

 */

/*

 * Convert float to double, according to "f2d" bytecode semantics

 */

static jdouble VMfloat2Double(jfloat op);

/*

 ******************************************

 * Java double floating-point manipulation.

 ******************************************

 *

 * The result argument is, once again, an lvalue.

 *

 * Conversions:

 */

/*

 * Convert double to int, according to "d2i" bytecode semantics

 */

static jint VMdouble2Int(jdouble val);

/*

 * Convert double to float, according to "d2f" bytecode semantics

 */

static jfloat VMdouble2Float(jdouble val);

/*

 * Convert int to double, according to "i2d" bytecode semantics

 */

static jdouble VMint2Double(jint val);

/*

 * Arithmetic:

 *

 * The functions below follow the semantics of the

 * dadd, dsub, ddiv, dmul, and drem bytecodes, respectively.

 */

static jdouble VMdoubleAdd(jdouble op1, jdouble op2);

static jdouble VMdoubleSub(jdouble op1, jdouble op2);

static jdouble VMdoubleDiv(jdouble op1, jdouble op2);

static jdouble VMdoubleMul(jdouble op1, jdouble op2);

static jdouble VMdoubleRem(jdouble op1, jdouble op2);

/*

 * Unary:

 *

 * Return the negation of "op" (-op), according to

 * the semantics of the dneg bytecode.

 */

static jdouble VMdoubleNeg(jdouble op);

/*

 * Comparisons (returning an int32_t value: 0, 1, or -1)

 *

 * Between operands:

 *

 * Compare "op1" and "op2" according to the semantics of the

 * "dcmpl" (direction is -1) or "dcmpg" (direction is 1) bytecodes.

 */

static int32_t VMdoubleCompare(jdouble op1, jdouble op2, int32_t direction);

/*

 * Copy two typeless 32-bit words from one location to another.

 * This is semantically equivalent to:

 *

 * to[0] = from[0];

 * to[1] = from[1];

 *

 * but this interface is provided for those platforms that could

 * optimize this into a single 64-bit transfer.

 */

static void VMmemCopy64(uint32_t to[2], const uint32_t from[2]);

// Arithmetic operations

/*

 * Java arithmetic methods.

 * The functions below follow the semantics of the

 * iadd, isub, imul, idiv, irem, iand, ior, ixor,

 * and ineg bytecodes, respectively.

 */

static jint VMintAdd(jint op1, jint op2);

static jint VMintSub(jint op1, jint op2);

static jint VMintMul(jint op1, jint op2);

static jint VMintDiv(jint op1, jint op2);

static jint VMintRem(jint op1, jint op2);

static jint VMintAnd(jint op1, jint op2);

static jint VMintOr (jint op1, jint op2);

static jint VMintXor(jint op1, jint op2);

/*

 * Shift Operation:

 * The functions below follow the semantics of the

 * iushr, ishl, and ishr bytecodes, respectively.

 */

static juint VMintUshr(jint op, jint num);

static jint VMintShl (jint op, jint num);

static jint VMintShr (jint op, jint num);

/*

 * Unary Operation:

 *

 * Return the negation of "op" (-op), according to

 * the semantics of the ineg bytecode.

 */

static jint VMintNeg(jint op);

/*

 * Int Conversions:

 */

/*

 * Convert int to float, according to "i2f" bytecode semantics

 */

static jfloat VMint2Float(jint val);

/*

 * Convert int to byte, according to "i2b" bytecode semantics

 */

static jbyte VMint2Byte(jint val);

/*

 * Convert int to char, according to "i2c" bytecode semantics

 */

static jchar VMint2Char(jint val);

/*

 * Convert int to short, according to "i2s" bytecode semantics

 */

static jshort VMint2Short(jint val);

/*=========================================================================

 * Bytecode interpreter operations

 *=======================================================================*/

static void dup(intptr_t *tos);

static void dup2(intptr_t *tos);

static void dup_x1(intptr_t *tos);    /* insert top word two down */

static void dup_x2(intptr_t *tos);    /* insert top word three down  */

static void dup2_x1(intptr_t *tos);   /* insert top 2 slots three down */

static void dup2_x2(intptr_t *tos);   /* insert top 2 slots four down */

static void swap(intptr_t *tos);      /* swap top two elements */

// umm don't like this method modifies its object

// The Interpreter used when

static void run(interpreterState istate);

// The interpreter used if JVMTI needs interpreter events

static void runWithChecks(interpreterState istate);

static void End_Of_Interpreter(void);

// Inline static functions for Java Stack and Local manipulation

static address stack_slot(intptr_t *tos, int offset);