| /* |
| * 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 |