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Java example source code file (bytecodeInterpreter.hpp)

This example Java source code file (bytecodeInterpreter.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytecodeinterpreter, cc_interp, constantpoolcache, datalayout, for, method, share_vm_interpreter_bytecodeinterpreter_hpp, target_arch_arm, target_arch_ppc, target_arch_x86, target_arch_zero, vmjavaval32, vmjavaval64, vmslotval32

The bytecodeInterpreter.hpp Java example source code

/*
 * Copyright (c) 2002, 2012, 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.
 *
 */

#ifndef SHARE_VM_INTERPRETER_BYTECODEINTERPRETER_HPP
#define SHARE_VM_INTERPRETER_BYTECODEINTERPRETER_HPP

#include "memory/allocation.hpp"
#include "oops/methodData.hpp"
#include "oops/method.hpp"
#include "runtime/basicLock.hpp"
#include "runtime/frame.hpp"
#include "runtime/globals.hpp"
#include "utilities/globalDefinitions.hpp"
#ifdef TARGET_ARCH_x86
# include "bytes_x86.hpp"
#endif
#ifdef TARGET_ARCH_sparc
# include "bytes_sparc.hpp"
#endif
#ifdef TARGET_ARCH_zero
# include "bytes_zero.hpp"
#endif
#ifdef TARGET_ARCH_arm
# include "bytes_arm.hpp"
#endif
#ifdef TARGET_ARCH_ppc
# include "bytes_ppc.hpp"
#endif

#ifdef CC_INTERP

// JavaStack Implementation
#define MORE_STACK(count)  \
    (topOfStack -= ((count) * Interpreter::stackElementWords))

// CVM definitions find hotspot equivalents...

union VMJavaVal64 {
    jlong   l;
    jdouble d;
    uint32_t      v[2];
};


typedef class BytecodeInterpreter* interpreterState;

struct call_message {
    class Method* _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
    ConstantPoolCache*    _constants;     // constant pool cache
    Method*               _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,
                                    Method* 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 ConstantPoolCache* constants() { return _constants; }
inline Method* 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 Method* callee() { return _result._to_call._callee; }
inline void set_callee(Method* 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);
static jint stack_int(intptr_t *tos, int offset);
static jfloat stack_float(intptr_t *tos, int offset);
static oop stack_object(intptr_t *tos, int offset);
static jdouble stack_double(intptr_t *tos, int offset);
static jlong stack_long(intptr_t *tos, int offset);

// only used for value types
static void set_stack_slot(intptr_t *tos, address value, int offset);
static void set_stack_int(intptr_t *tos, int value, int offset);
static void set_stack_float(intptr_t *tos, jfloat value, int offset);
static void set_stack_object(intptr_t *tos, oop value, int offset);

// needs to be platform dep for the 32 bit platforms.
static void set_stack_double(intptr_t *tos, jdouble value, int offset);
static void set_stack_long(intptr_t *tos, jlong value, int offset);

static void set_stack_double_from_addr(intptr_t *tos, address addr, int offset);
static void set_stack_long_from_addr(intptr_t *tos, address addr, int offset);

// Locals

static address locals_slot(intptr_t* locals, int offset);
static jint locals_int(intptr_t* locals, int offset);
static jfloat locals_float(intptr_t* locals, int offset);
static oop locals_object(intptr_t* locals, int offset);
static jdouble locals_double(intptr_t* locals, int offset);
static jlong locals_long(intptr_t* locals, int offset);

static address locals_long_at(intptr_t* locals, int offset);
static address locals_double_at(intptr_t* locals, int offset);

static void set_locals_slot(intptr_t *locals, address value, int offset);
static void set_locals_int(intptr_t *locals, jint value, int offset);
static void set_locals_float(intptr_t *locals, jfloat value, int offset);
static void set_locals_object(intptr_t *locals, oop value, int offset);
static void set_locals_double(intptr_t *locals, jdouble value, int offset);
static void set_locals_long(intptr_t *locals, jlong value, int offset);
static void set_locals_double_from_addr(intptr_t *locals,
                                   address addr, int offset);
static void set_locals_long_from_addr(intptr_t *locals,
                                   address addr, int offset);

static void astore(intptr_t* topOfStack, int stack_offset,
                   intptr_t* locals,     int locals_offset);

// Support for dup and swap
static void copy_stack_slot(intptr_t *tos, int from_offset, int to_offset);

#ifndef PRODUCT
static const char* C_msg(BytecodeInterpreter::messages msg);
void print();
#endif // PRODUCT

    // Platform fields/methods
#ifdef TARGET_ARCH_x86
# include "bytecodeInterpreter_x86.hpp"
#endif
#ifdef TARGET_ARCH_sparc
# include "bytecodeInterpreter_sparc.hpp"
#endif
#ifdef TARGET_ARCH_zero
# include "bytecodeInterpreter_zero.hpp"
#endif
#ifdef TARGET_ARCH_arm
# include "bytecodeInterpreter_arm.hpp"
#endif
#ifdef TARGET_ARCH_ppc
# include "bytecodeInterpreter_ppc.hpp"
#endif


}; // BytecodeInterpreter

#endif // CC_INTERP

#endif // SHARE_VM_INTERPRETER_BYTECODEINTERPRETER_HPP

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