jdk8-mips64-public/hotspot: src/share/vm/classfile/stackMapTable.hpp@2c6ef90f030a (annotated)

src/share/vm/classfile/stackMapTable.hpp@2c6ef90f030a (annotated)

src/share/vm/classfile/stackMapTable.hpp

Mon, 07 Jul 2014 10:12:40 +0200

author: stefank
date: Mon, 07 Jul 2014 10:12:40 +0200
changeset 6992: 2c6ef90f030a
parent 6872: c77d5db18942
child 6876: 710a3c8b516e
child 8703: 02a3d0dcbedd
permissions: -rw-r--r--

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

 /*
  * Copyright (c) 2003, 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_CLASSFILE_STACKMAPTABLE_HPP
 #define SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP
 #include "classfile/stackMapFrame.hpp"
 #include "classfile/verifier.hpp"
 #include "memory/allocation.hpp"
 #include "oops/constantPool.hpp"
 #include "oops/method.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
 class StackMapReader;
 // StackMapTable class is the StackMap table used by type checker
 class StackMapTable : public StackObj {
  private:
   // Logically, the _frame_count (as well as many fields in the StackFrame)
   // should be a u2, but if we defined the variable as that type it will
   // be difficult to detect/recover from overflow or underflow conditions.
   // Widening the type and making it signed will help detect these.
   int32_t              _code_length;
   int32_t              _frame_count;     // Stackmap frame count
   StackMapFrame**       _frame_array;
  public:
   StackMapTable(StackMapReader* reader, StackMapFrame* init_frame,
                 u2 max_locals, u2 max_stack,
                 char* code_data, int code_len, TRAPS);
   inline int32_t get_frame_count() const { return _frame_count; }
   inline int get_offset(int index) const {
     return _frame_array[index]->offset();
   }
   // Match and/or update current_frame to the frame in stackmap table with
   // specified offset. Return true if the two frames match.
   bool match_stackmap(
     StackMapFrame* current_frame, int32_t offset,
     bool match, bool update, bool handler, ErrorContext* ctx, TRAPS) const;
   // Match and/or update current_frame to the frame in stackmap table with
   // specified offset and frame index. Return true if the two frames match.
   bool match_stackmap(
     StackMapFrame* current_frame, int32_t offset, int32_t frame_index,
     bool match, bool update, bool handler, ErrorContext* ctx, TRAPS) const;
   // Check jump instructions. Make sure there are no uninitialized
   // instances on backward branch.
   void check_jump_target(StackMapFrame* frame, int32_t target, TRAPS) const;
   // The following methods are only used inside this class.
   // Returns the frame array index where the frame with offset is stored.
   int get_index_from_offset(int32_t offset) const;
   void print_on(outputStream* str) const;
 };
 class StackMapStream : StackObj {
  private:
   Array<u1>* _data;
   int _index;
  public:
   StackMapStream(Array<u1>* ah)
     : _data(ah), _index(0) {
   }
   u1 get_u1(TRAPS) {
     if (_data == NULL || _index >= _data->length()) {
       stackmap_format_error("access beyond the end of attribute", CHECK_0);
     }
     return _data->at(_index++);
   }
   u2 get_u2(TRAPS) {
     if (_data == NULL || _index >= _data->length() - 1) {
       stackmap_format_error("access beyond the end of attribute", CHECK_0);
     }
     u2 res = Bytes::get_Java_u2(_data->adr_at(_index));
     _index += 2;
     return res;
   }
   bool at_end() {
     return (_data == NULL) || (_index == _data->length());
   }
   static void stackmap_format_error(const char* msg, TRAPS);
 };
 class StackMapReader : StackObj {
  private:
   // information about the class and method
   constantPoolHandle  _cp;
   ClassVerifier* _verifier;
   StackMapStream* _stream;
   char* _code_data;
   int32_t _code_length;
   // information get from the attribute
   int32_t  _frame_count;       // frame count
   int32_t chop(VerificationType* locals, int32_t length, int32_t chops);
   VerificationType parse_verification_type(u1* flags, TRAPS);
   void check_verification_type_array_size(
       int32_t size, int32_t max_size, TRAPS) {
     if (size < 0 || size > max_size) {
       // Since this error could be caused someone rewriting the method
       // but not knowing to update the stackmap data, we call the the
       // verifier's error method, which may not throw an exception and
       // failover to the old verifier instead.
       _verifier->class_format_error(
         "StackMapTable format error: bad type array size");
     }
   }
   enum {
     SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247,
     SAME_EXTENDED = 251,
     FULL = 255
   };
  public:
   // Constructor
   StackMapReader(ClassVerifier* v, StackMapStream* stream, char* code_data,
                  int32_t code_len, TRAPS) :
                  _verifier(v), _stream(stream),
                  _code_data(code_data), _code_length(code_len) {
     methodHandle m = v->method();
     if (m->has_stackmap_table()) {
       _cp = constantPoolHandle(THREAD, m->constants());
       _frame_count = _stream->get_u2(CHECK);
     } else {
       // There's no stackmap table present. Frame count and size are 0.
       _frame_count = 0;
     }
   }
   inline int32_t get_frame_count() const                { return _frame_count; }
   StackMapFrame* next(StackMapFrame* pre_frame, bool first,
                       u2 max_locals, u2 max_stack, TRAPS);
   void check_end(TRAPS) {
     if (!_stream->at_end()) {
       StackMapStream::stackmap_format_error("wrong attribute size", CHECK);
     }
   }
 };
 #endif // SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/classfile/stackMapTable.hpp@2c6ef90f030a (annotated)

src/share/vm/classfile/stackMapTable.hpp