jdk8-mips64-public/hotspot: src/share/vm/interpreter/bytecodeStream.hpp@b92c45f2bc75

7016023: Enable building ARM and PPC from src/closed repository
Reviewed-by: dholmes, bdelsart

     1 /*

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

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

    18  *

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    25 #ifndef SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP

    26 #define SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP

    28 #include "interpreter/bytecode.hpp"

    29 #include "memory/allocation.hpp"

    30 #include "oops/methodOop.hpp"

    31 #ifdef TARGET_ARCH_x86

    32 # include "bytes_x86.hpp"

    33 #endif

    34 #ifdef TARGET_ARCH_sparc

    35 # include "bytes_sparc.hpp"

    36 #endif

    37 #ifdef TARGET_ARCH_zero

    38 # include "bytes_zero.hpp"

    39 #endif

    40 #ifdef TARGET_ARCH_arm

    41 # include "bytes_arm.hpp"

    42 #endif

    43 #ifdef TARGET_ARCH_ppc

    44 # include "bytes_ppc.hpp"

    45 #endif

    47 // A BytecodeStream is used for fast iteration over the bytecodes

    48 // of a methodOop.

    49 //

    50 // Usage:

    51 //

    52 // BytecodeStream s(method);

    53 // Bytecodes::Code c;

    54 // while ((c = s.next()) >= 0) {

    55 //   ...

    56 // }

    58 // A RawBytecodeStream is a simple version of BytecodeStream.

    59 // It is used ONLY when we know the bytecodes haven't been rewritten

    60 // yet, such as in the rewriter or the verifier.

    62 // Here is the common base class for both RawBytecodeStream and BytecodeStream:

    63 class BaseBytecodeStream: StackObj {

    64  protected:

    65   // stream buffer

    66   methodHandle    _method;                       // read from method directly

    68   // reading position

    69   int             _bci;                          // bci if current bytecode

    70   int             _next_bci;                     // bci of next bytecode

    71   int             _end_bci;                      // bci after the current iteration interval

    73   // last bytecode read

    74   Bytecodes::Code _raw_code;

    75   bool            _is_wide;

    76   bool            _is_raw;                       // false in 'cooked' BytecodeStream

    78   // Construction

    79   BaseBytecodeStream(methodHandle method) : _method(method) {

    80     set_interval(0, _method->code_size());

    81     _is_raw = false;

    82   }

    84  public:

    85   // Iteration control

    86   void set_interval(int beg_bci, int end_bci) {

    87     // iterate over the interval [beg_bci, end_bci)

    88     assert(0 <= beg_bci && beg_bci <= method()->code_size(), "illegal beg_bci");

    89     assert(0 <= end_bci && end_bci <= method()->code_size(), "illegal end_bci");

    90     // setup of iteration pointers

    91     _bci      = beg_bci;

    92     _next_bci = beg_bci;

    93     _end_bci  = end_bci;

    94   }

    95   void set_start   (int beg_bci) {

    96     set_interval(beg_bci, _method->code_size());

    97   }

    99   bool is_raw() const { return _is_raw; }

   101   // Stream attributes

   102   methodHandle    method() const                 { return _method; }

   104   int             bci() const                    { return _bci; }

   105   int             next_bci() const               { return _next_bci; }

   106   int             end_bci() const                { return _end_bci; }

   108   Bytecodes::Code raw_code() const               { return _raw_code; }

   109   bool            is_wide() const                { return _is_wide; }

   110   int             instruction_size() const       { return (_next_bci - _bci); }

   111   bool            is_last_bytecode() const       { return _next_bci >= _end_bci; }

   113   address         bcp() const                    { return method()->code_base() + _bci; }

   114   Bytecode        bytecode() const               { return Bytecode(_method(), bcp()); }

   116   // State changes

   117   void            set_next_bci(int bci)          { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; }

   119   // Bytecode-specific attributes

   120   int             dest() const                   { return bci() + bytecode().get_offset_s2(raw_code()); }

   121   int             dest_w() const                 { return bci() + bytecode().get_offset_s4(raw_code()); }

   123   // One-byte indices.

   124   int             get_index_u1() const           { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); }

   126  protected:

   127   void assert_raw_index_size(int size) const NOT_DEBUG_RETURN;

   128   void assert_raw_stream(bool want_raw) const NOT_DEBUG_RETURN;

   129 };

   131 class RawBytecodeStream: public BaseBytecodeStream {

   132  public:

   133   // Construction

   134   RawBytecodeStream(methodHandle method) : BaseBytecodeStream(method) {

   135     _is_raw = true;

   136   }

   138  public:

   139   // Iteration

   140   // Use raw_next() rather than next() for faster method reference

   141   Bytecodes::Code raw_next() {

   142     Bytecodes::Code code;

   143     // set reading position

   144     _bci = _next_bci;

   145     assert(!is_last_bytecode(), "caller should check is_last_bytecode()");

   147     address bcp = this->bcp();

   148     code        = Bytecodes::code_or_bp_at(bcp);

   150     // set next bytecode position

   151     int l = Bytecodes::length_for(code);

   152     if (l > 0 && (_bci + l) <= _end_bci) {

   153       assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch

   154              && code != Bytecodes::_lookupswitch, "can't be special bytecode");

   155       _is_wide = false;

   156       _next_bci += l;

   157       _raw_code = code;

   158       return code;

   159     } else {

   160       return raw_next_special(code);

   161     }

   162   }

   163   Bytecodes::Code raw_next_special(Bytecodes::Code code);

   165   // Unsigned indices, widening, with no swapping of bytes

   166   int             get_index() const          { return (is_wide()) ? get_index_u2_raw(bcp() + 2) : get_index_u1(); }

   167   // Get an unsigned 2-byte index, with no swapping of bytes.

   168   int             get_index_u2() const       { assert(!is_wide(), ""); return get_index_u2_raw(bcp() + 1);  }

   170  private:

   171   int get_index_u2_raw(address p) const {

   172     assert_raw_index_size(2); assert_raw_stream(true);

   173     return Bytes::get_Java_u2(p);

   174   }

   175 };

   177 // In BytecodeStream, non-java bytecodes will be translated into the

   178 // corresponding java bytecodes.

   180 class BytecodeStream: public BaseBytecodeStream {

   181   Bytecodes::Code _code;

   183  public:

   184   // Construction

   185   BytecodeStream(methodHandle method) : BaseBytecodeStream(method) { }

   187   // Iteration

   188   Bytecodes::Code next() {

   189     Bytecodes::Code raw_code, code;

   190     // set reading position

   191     _bci = _next_bci;

   192     if (is_last_bytecode()) {

   193       // indicate end of bytecode stream

   194       raw_code = code = Bytecodes::_illegal;

   195     } else {

   196       // get bytecode

   197       address bcp = this->bcp();

   198       raw_code = Bytecodes::code_at(_method(), bcp);

   199       code = Bytecodes::java_code(raw_code);

   200       // set next bytecode position

   201       //

   202       // note that we cannot advance before having the

   203       // tty bytecode otherwise the stepping is wrong!

   204       // (carefull: length_for(...) must be used first!)

   205       int l = Bytecodes::length_for(code);

   206       if (l == 0) l = Bytecodes::length_at(_method(), bcp);

   207       _next_bci  += l;

   208       assert(_bci < _next_bci, "length must be > 0");

   209       // set attributes

   210       _is_wide      = false;

   211       // check for special (uncommon) cases

   212       if (code == Bytecodes::_wide) {

   213         raw_code = (Bytecodes::Code)bcp[1];

   214         code = raw_code;  // wide BCs are always Java-normal

   215         _is_wide = true;

   216       }

   217       assert(Bytecodes::is_java_code(code), "sanity check");

   218     }

   219     _raw_code = raw_code;

   220     _code = code;

   221     return _code;

   222   }

   224   bool            is_active_breakpoint() const   { return Bytecodes::is_active_breakpoint_at(bcp()); }

   225   Bytecodes::Code code() const                   { return _code; }

   227   // Unsigned indices, widening

   228   int             get_index() const              { return is_wide() ? bytecode().get_index_u2(raw_code(), true) : get_index_u1(); }

   229   // Get an unsigned 2-byte index, swapping the bytes if necessary.

   230   int             get_index_u2() const           { assert_raw_stream(false);

   231                                                    return bytecode().get_index_u2(raw_code(), false); }

   232   // Get an unsigned 2-byte index in native order.

   233   int             get_index_u2_cpcache() const   { assert_raw_stream(false);

   234                                                    return bytecode().get_index_u2_cpcache(raw_code()); }

   235   int             get_index_u4() const           { assert_raw_stream(false);

   236                                                    return bytecode().get_index_u4(raw_code()); }

   237   bool            has_index_u4() const           { return bytecode().has_index_u4(raw_code()); }

   238 };

   240 #endif // SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/interpreter/bytecodeStream.hpp@b92c45f2bc75

src/share/vm/interpreter/bytecodeStream.hpp