hotspot/src/share/vm/ci/ciStreams.hpp
author twisti
Tue, 24 Jul 2012 10:51:00 -0700
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7023639: JSR 292 method handle invocation needs a fast path for compiled code 6984705: JSR 292 method handle creation should not go through JNI Summary: remove assembly code for JDK 7 chained method handles Reviewed-by: jrose, twisti, kvn, mhaupt Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>
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/*
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 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_CI_CISTREAMS_HPP
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#define SHARE_VM_CI_CISTREAMS_HPP
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#include "ci/ciClassList.hpp"
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#include "ci/ciExceptionHandler.hpp"
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#include "ci/ciInstanceKlass.hpp"
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#include "ci/ciMethod.hpp"
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#include "interpreter/bytecode.hpp"
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// ciBytecodeStream
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//
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// The class is used to iterate over the bytecodes of a method.
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// It hides the details of constant pool structure/access by
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// providing accessors for constant pool items.  It returns only pure
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// Java bytecodes; VM-internal _fast bytecodes are translated back to
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// their original form during iteration.
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class ciBytecodeStream : StackObj {
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private:
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  // Handling for the weird bytecodes
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  Bytecodes::Code next_wide_or_table(Bytecodes::Code); // Handle _wide & complicated inline table
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  static Bytecodes::Code check_java(Bytecodes::Code c) {
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    assert(Bytecodes::is_java_code(c), "should not return _fast bytecodes");
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    return c;
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  }
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  static Bytecodes::Code check_defined(Bytecodes::Code c) {
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    assert(Bytecodes::is_defined(c), "");
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    return c;
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  }
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  ciMethod* _method;           // the method
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  ciInstanceKlass* _holder;
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  ciCPCache* _cpcache;
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  address _bc_start;            // Start of current bytecode for table
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  address _was_wide;            // Address past last wide bytecode
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  jint* _table_base;            // Aligned start of last table or switch
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  address _start;                  // Start of bytecodes
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  address _end;                    // Past end of bytecodes
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  address _pc;                     // Current PC
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  Bytecodes::Code _bc;             // Current bytecode
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  Bytecodes::Code _raw_bc;         // Current bytecode, raw form
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  void reset( address base, unsigned int size ) {
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    _bc_start =_was_wide = 0;
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    _start = _pc = base; _end = base + size;
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    _cpcache = NULL;
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  }
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  void assert_wide(bool require_wide) const {
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    if (require_wide)
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         { assert(is_wide(),  "must be a wide instruction"); }
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    else { assert(!is_wide(), "must not be a wide instruction"); }
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  }
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  Bytecode bytecode() const { return Bytecode(this, _bc_start); }
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  Bytecode next_bytecode() const { return Bytecode(this, _pc); }
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public:
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  // End-Of-Bytecodes
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  static Bytecodes::Code EOBC() {
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    return Bytecodes::_illegal;
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  }
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  ciBytecodeStream(ciMethod* m) {
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    reset_to_method(m);
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  }
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  ciBytecodeStream() {
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    reset_to_method(NULL);
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  }
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  ciMethod* method() const { return _method; }
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  void reset_to_method(ciMethod* m) {
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    _method = m;
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    if (m == NULL) {
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      _holder = NULL;
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      reset(NULL, 0);
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    } else {
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      _holder = m->holder();
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      reset(m->code(), m->code_size());
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    }
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  }
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  void reset_to_bci( int bci );
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  // Force the iterator to report a certain bci.
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  void force_bci(int bci);
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  void set_max_bci( int max ) {
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    _end = _start + max;
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  }
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  address cur_bcp() const       { return _bc_start; }  // Returns bcp to current instruction
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  int next_bci() const          { return _pc - _start; }
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  int cur_bci() const           { return _bc_start - _start; }
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  int instruction_size() const  { return _pc - _bc_start; }
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  Bytecodes::Code cur_bc() const{ return check_java(_bc); }
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  Bytecodes::Code cur_bc_raw() const { return check_defined(_raw_bc); }
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  Bytecodes::Code next_bc()     { return Bytecodes::java_code((Bytecodes::Code)* _pc); }
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  // Return current ByteCode and increment PC to next bytecode, skipping all
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  // intermediate constants.  Returns EOBC at end.
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  // Expected usage:
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  //     ciBytecodeStream iter(m);
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  //     while (iter.next() != ciBytecodeStream::EOBC()) { ... }
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  Bytecodes::Code next() {
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    _bc_start = _pc;                        // Capture start of bc
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    if( _pc >= _end ) return EOBC();        // End-Of-Bytecodes
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    // Fetch Java bytecode
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    // All rewritten bytecodes maintain the size of original bytecode.
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    _bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)*_pc);
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    int csize = Bytecodes::length_for(_bc); // Expected size
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    _pc += csize;                           // Bump PC past bytecode
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    if (csize == 0) {
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      _bc = next_wide_or_table(_bc);
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    }
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    return check_java(_bc);
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  }
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  bool is_wide() const { return ( _pc == _was_wide ); }
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  // Does this instruction contain an index which refes into the CP cache?
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  bool has_cache_index() const { return Bytecodes::uses_cp_cache(cur_bc_raw()); }
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  int get_index_u1() const {
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    return bytecode().get_index_u1(cur_bc_raw());
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  }
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  int get_index_u1_cpcache() const {
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    return bytecode().get_index_u1_cpcache(cur_bc_raw());
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  }
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  // Get a byte index following this bytecode.
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  // If prefixed with a wide bytecode, get a wide index.
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  int get_index() const {
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    assert(!has_cache_index(), "else use cpcache variant");
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    return (_pc == _was_wide)   // was widened?
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      ? get_index_u2(true)      // yes, return wide index
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      : get_index_u1();         // no, return narrow index
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  }
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  // Get 2-byte index (byte swapping depending on which bytecode)
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  int get_index_u2(bool is_wide = false) const {
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    return bytecode().get_index_u2(cur_bc_raw(), is_wide);
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  }
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  // Get 2-byte index in native byte order.  (Rewriter::rewrite makes these.)
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  int get_index_u2_cpcache() const {
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    return bytecode().get_index_u2_cpcache(cur_bc_raw());
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  }
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  // Get 4-byte index, for invokedynamic.
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  int get_index_u4() const {
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    return bytecode().get_index_u4(cur_bc_raw());
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  }
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  bool has_index_u4() const {
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    return bytecode().has_index_u4(cur_bc_raw());
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  }
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  // Get dimensions byte (multinewarray)
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  int get_dimensions() const { return *(unsigned char*)(_pc-1); }
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  // Sign-extended index byte/short, no widening
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  int get_constant_u1()                     const { return bytecode().get_constant_u1(instruction_size()-1, cur_bc_raw()); }
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  int get_constant_u2(bool is_wide = false) const { return bytecode().get_constant_u2(instruction_size()-2, cur_bc_raw(), is_wide); }
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  // Get a byte signed constant for "iinc".  Invalid for other bytecodes.
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  // If prefixed with a wide bytecode, get a wide constant
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  int get_iinc_con() const {return (_pc==_was_wide) ? (jshort) get_constant_u2(true) : (jbyte) get_constant_u1();}
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  // 2-byte branch offset from current pc
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  int get_dest() const {
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    return cur_bci() + bytecode().get_offset_s2(cur_bc_raw());
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  }
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  // 2-byte branch offset from next pc
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  int next_get_dest() const {
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    assert(_pc < _end, "");
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    return next_bci() + next_bytecode().get_offset_s2(Bytecodes::_ifeq);
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  }
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  // 4-byte branch offset from current pc
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  int get_far_dest() const {
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    return cur_bci() + bytecode().get_offset_s4(cur_bc_raw());
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  }
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  // For a lookup or switch table, return target destination
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  int get_int_table( int index ) const {
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    return Bytes::get_Java_u4((address)&_table_base[index]); }
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  // For tableswitch - get length of offset part
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  int get_tableswitch_length()  { return get_int_table(2)-get_int_table(1)+1; }
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  int get_dest_table( int index ) const {
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    return cur_bci() + get_int_table(index); }
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  // --- Constant pool access ---
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  int get_constant_raw_index() const;
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  int get_constant_pool_index() const;
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  int get_constant_cache_index() const;
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  int get_field_index();
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  int get_method_index();
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  // If this bytecode is a new, newarray, multianewarray, instanceof,
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  // or checkcast, get the referenced klass.
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  ciKlass* get_klass(bool& will_link);
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  int get_klass_index() const;
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  // If this bytecode is one of the ldc variants, get the referenced
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  // constant.  Do not attempt to resolve it, since that would require
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  // execution of Java code.  If it is not resolved, return an unloaded
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  // object (ciConstant.as_object()->is_loaded() == false).
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  ciConstant get_constant();
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  constantTag get_constant_pool_tag(int index) const;
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  // True if the klass-using bytecode points to an unresolved klass
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  bool is_unresolved_klass() const {
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    constantTag tag = get_constant_pool_tag(get_klass_index());
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    return tag.is_unresolved_klass();
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  }
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  // If this bytecode is one of get_field, get_static, put_field,
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  // or put_static, get the referenced field.
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  ciField* get_field(bool& will_link);
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  ciInstanceKlass* get_declared_field_holder();
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  int      get_field_holder_index();
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  int      get_field_signature_index();
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  // If this is a method invocation bytecode, get the invoked method.
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  ciMethod* get_method(bool& will_link);
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  bool      has_appendix();
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  ciObject* get_appendix();
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  ciKlass*  get_declared_method_holder();
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  int       get_method_holder_index();
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  ciSignature* get_declared_method_signature();
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  int       get_method_signature_index();
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  ciCPCache*  get_cpcache() const;
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  ciCallSite* get_call_site();
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};
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// ciSignatureStream
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//
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// The class is used to iterate over the elements of a method signature.
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class ciSignatureStream : public StackObj {
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private:
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  ciSignature* _sig;
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  int    _pos;
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public:
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  ciSignatureStream(ciSignature* signature) {
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    _sig = signature;
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    _pos = 0;
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  }
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  bool at_return_type() { return _pos == _sig->count(); }
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  bool is_done() { return _pos > _sig->count(); }
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  void next() {
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    if (_pos <= _sig->count()) {
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      _pos++;
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    }
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  }
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  ciType* type() {
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    if (at_return_type()) {
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      return _sig->return_type();
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    } else {
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      return _sig->type_at(_pos);
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    }
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  }
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};
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// ciExceptionHandlerStream
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//
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// The class is used to iterate over the exception handlers of
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// a method.
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class ciExceptionHandlerStream : public StackObj {
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private:
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  // The method whose handlers we are traversing
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  ciMethod* _method;
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  // Our current position in the list of handlers
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  int        _pos;
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  int        _end;
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  ciInstanceKlass*  _exception_klass;
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  int        _bci;
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  bool       _is_exact;
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public:
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  ciExceptionHandlerStream(ciMethod* method) {
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    _method = method;
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    // Force loading of method code and handlers.
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    _method->code();
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    _pos = 0;
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    _end = _method->_handler_count;
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    _exception_klass = NULL;
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    _bci    = -1;
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    _is_exact = false;
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  }
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  ciExceptionHandlerStream(ciMethod* method, int bci,
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                           ciInstanceKlass* exception_klass = NULL,
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                           bool is_exact = false) {
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    _method = method;
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    // Force loading of method code and handlers.
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    _method->code();
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    _pos = -1;
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    _end = _method->_handler_count + 1; // include the rethrow handler
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    _exception_klass = (exception_klass != NULL && exception_klass->is_loaded()
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                          ? exception_klass
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                          : NULL);
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    _bci = bci;
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    assert(_bci >= 0, "bci out of range");
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    _is_exact = is_exact;
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    next();
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  }
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  // These methods are currently implemented in an odd way.
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  // Count the number of handlers the iterator has ever produced
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  // or will ever produce.  Do not include the final rethrow handler.
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  // That is, a trivial exception handler stream will have a count
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  // of zero and produce just the rethrow handler.
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  int count();
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  // Count the number of handlers this stream will produce from now on.
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  // Include the current handler, and the final rethrow handler.
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  // The remaining count will be zero iff is_done() is true,
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  int count_remaining();
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   368
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  bool is_done() {
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    return (_pos >= _end);
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  }
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  void next() {
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    _pos++;
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    if (_bci != -1) {
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      // We are not iterating over all handlers...
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      while (!is_done()) {
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        ciExceptionHandler* handler = _method->_exception_handlers[_pos];
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        if (handler->is_in_range(_bci)) {
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          if (handler->is_catch_all()) {
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            // Found final active catch block.
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            _end = _pos+1;
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            return;
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   384
          } else if (_exception_klass == NULL || !handler->catch_klass()->is_loaded()) {
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            // We cannot do any type analysis here.  Must conservatively assume
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            // catch block is reachable.
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            return;
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   388
          } else if (_exception_klass->is_subtype_of(handler->catch_klass())) {
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            // This catch clause will definitely catch the exception.
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            // Final candidate.
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            _end = _pos+1;
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   392
            return;
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   393
          } else if (!_is_exact &&
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   394
                     handler->catch_klass()->is_subtype_of(_exception_klass)) {
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   395
            // This catch block may be reachable.
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            return;
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   397
          }
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   398
        }
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   399
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   400
        // The catch block was not pertinent.  Go on.
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        _pos++;
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   402
      }
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   403
    } else {
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   404
      // This is an iteration over all handlers.
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   405
      return;
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   406
    }
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   407
  }
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   408
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   409
  ciExceptionHandler* handler() {
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   410
    return _method->_exception_handlers[_pos];
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  }
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};
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5882
diff changeset
   413
7913
dd096a83bdbb 4926272: methodOopDesc::method_from_bcp is unsafe
never
parents: 7397
diff changeset
   414
dd096a83bdbb 4926272: methodOopDesc::method_from_bcp is unsafe
never
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diff changeset
   415
dd096a83bdbb 4926272: methodOopDesc::method_from_bcp is unsafe
never
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   416
// Implementation for declarations in bytecode.hpp
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never
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   417
Bytecode::Bytecode(const ciBytecodeStream* stream, address bcp): _bcp(bcp != NULL ? bcp : stream->cur_bcp()), _code(Bytecodes::code_at(NULL, addr_at(0))) {}
dd096a83bdbb 4926272: methodOopDesc::method_from_bcp is unsafe
never
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   418
Bytecode_lookupswitch::Bytecode_lookupswitch(const ciBytecodeStream* stream): Bytecode(stream) { verify(); }
dd096a83bdbb 4926272: methodOopDesc::method_from_bcp is unsafe
never
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   419
Bytecode_tableswitch::Bytecode_tableswitch(const ciBytecodeStream* stream): Bytecode(stream) { verify(); }
dd096a83bdbb 4926272: methodOopDesc::method_from_bcp is unsafe
never
parents: 7397
diff changeset
   420
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5882
diff changeset
   421
#endif // SHARE_VM_CI_CISTREAMS_HPP