jdk8-mips64-public/hotspot: src/share/vm/runtime/vmStructs.hpp@710a3c8b516e (annotated)

src/share/vm/runtime/vmStructs.hpp@710a3c8b516e (annotated)

src/share/vm/runtime/vmStructs.hpp

Tue, 08 Aug 2017 15:57:29 +0800

author: aoqi
date: Tue, 08 Aug 2017 15:57:29 +0800
changeset 6876: 710a3c8b516e
parent 4492: 8b46b0196eb0
parent 0: f90c822e73f8
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 2000, 2013, 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_RUNTIME_VMSTRUCTS_HPP
 #define SHARE_VM_RUNTIME_VMSTRUCTS_HPP
 #include "utilities/debug.hpp"
 #ifdef COMPILER1
 #include "c1/c1_Runtime1.hpp"
 #endif
 // This table encapsulates the debugging information required by the
 // serviceability agent in order to run. Specifically, we need to
 // understand the layout of certain C data structures (offsets, in
 // bytes, of their fields.)
 //
 // There are alternatives for the design of this mechanism, including
 // parsing platform-specific debugging symbols from a debug build into
 // a program database. While this current mechanism can be considered
 // to be a workaround for the inability to debug arbitrary C and C++
 // programs at the present time, it does have certain advantages.
 // First, it is platform-independent, which will vastly simplify the
 // initial bringup of the system both now and on future platforms.
 // Second, it is embedded within the VM, as opposed to being in a
 // separate program database; experience has shown that whenever
 // portions of a system are decoupled, version skew is problematic.
 // Third, generating a program database, for example for a product
 // build, would probably require two builds to be done: the desired
 // product build as well as an intermediary build with the PRODUCT
 // flag turned on but also compiled with -g, leading to a doubling of
 // the time required to get a serviceability agent-debuggable product
 // build. Fourth, and very significantly, this table probably
 // preserves more information about field types than stabs do; for
 // example, it preserves the fact that a field is a "jlong" rather
 // than transforming the type according to the typedef in jni_md.h,
 // which allows the Java-side code to identify "Java-sized" fields in
 // C++ data structures. If the symbol parsing mechanism was redone
 // using stabs, it might still be necessary to have a table somewhere
 // containing this information.
 //
 // Do not change the sizes or signedness of the integer values in
 // these data structures; they are fixed over in the serviceability
 // agent's Java code (for bootstrapping).
 typedef struct {
   const char* typeName;            // The type name containing the given field (example: "Klass")
   const char* fieldName;           // The field name within the type           (example: "_name")
   const char* typeString;          // Quoted name of the type of this field (example: "Symbol*";
                                    // parsed in Java to ensure type correctness
   int32_t  isStatic;               // Indicates whether following field is an offset or an address
   uint64_t offset;                 // Offset of field within structure; only used for nonstatic fields
   void* address;                   // Address of field; only used for static fields
                                    // ("offset" can not be reused because of apparent SparcWorks compiler bug
                                    // in generation of initializer data)
 } VMStructEntry;
 typedef struct {
   const char* typeName;            // Type name (example: "Method")
   const char* superclassName;      // Superclass name, or null if none (example: "oopDesc")
   int32_t isOopType;               // Does this type represent an oop typedef? (i.e., "Method*" or
                                    // "Klass*", but NOT "Method")
   int32_t isIntegerType;           // Does this type represent an integer type (of arbitrary size)?
   int32_t isUnsigned;              // If so, is it unsigned?
   uint64_t size;                   // Size, in bytes, of the type
 } VMTypeEntry;
 typedef struct {
   const char* name;                // Name of constant (example: "_thread_in_native")
   int32_t value;                   // Value of constant
 } VMIntConstantEntry;
 typedef struct {
   const char* name;                // Name of constant (example: "_thread_in_native")
   uint64_t value;                  // Value of constant
 } VMLongConstantEntry;
 // This class is a friend of most classes, to be able to access
 // private fields
 class VMStructs {
 public:
   // The last entry is identified over in the serviceability agent by
   // the fact that it has a NULL fieldName
   static VMStructEntry localHotSpotVMStructs[];
   // The last entry is identified over in the serviceability agent by
   // the fact that it has a NULL typeName
   static VMTypeEntry   localHotSpotVMTypes[];
   // Table of integer constants required by the serviceability agent.
   // The last entry is identified over in the serviceability agent by
   // the fact that it has a NULL typeName
   static VMIntConstantEntry localHotSpotVMIntConstants[];
   // Table of long constants required by the serviceability agent.
   // The last entry is identified over in the serviceability agent by
   // the fact that it has a NULL typeName
   static VMLongConstantEntry localHotSpotVMLongConstants[];
   // This is used to run any checking code necessary for validation of
   // the data structure (debug build only)
   static void init();
 #ifndef PRODUCT
   // Execute unit tests
   static void test();
 #endif
 private:
   // Look up a type in localHotSpotVMTypes using strcmp() (debug build only).
   // Returns 1 if found, 0 if not.
   //  debug_only(static int findType(const char* typeName);)
   static int findType(const char* typeName);
 };
 #endif // SHARE_VM_RUNTIME_VMSTRUCTS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/vmStructs.hpp@710a3c8b516e (annotated)

src/share/vm/runtime/vmStructs.hpp