1 /* 2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. 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). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_VMSTRUCTS_HPP 26 #define SHARE_VM_RUNTIME_VMSTRUCTS_HPP 27 28 #include "utilities/debug.hpp" 29 #ifdef COMPILER1 30 #include "c1/c1_Runtime1.hpp" 31 #endif 32 33 // This table encapsulates the debugging information required by the 34 // serviceability agent in order to run. Specifically, we need to 35 // understand the layout of certain C data structures (offsets, in 36 // bytes, of their fields.) 37 // 38 // There are alternatives for the design of this mechanism, including 39 // parsing platform-specific debugging symbols from a debug build into 40 // a program database. While this current mechanism can be considered 41 // to be a workaround for the inability to debug arbitrary C and C++ 42 // programs at the present time, it does have certain advantages. 43 // First, it is platform-independent, which will vastly simplify the 44 // initial bringup of the system both now and on future platforms. 45 // Second, it is embedded within the VM, as opposed to being in a 46 // separate program database; experience has shown that whenever 47 // portions of a system are decoupled, version skew is problematic. 48 // Third, generating a program database, for example for a product 49 // build, would probably require two builds to be done: the desired 50 // product build as well as an intermediary build with the PRODUCT 51 // flag turned on but also compiled with -g, leading to a doubling of 52 // the time required to get a serviceability agent-debuggable product 53 // build. Fourth, and very significantly, this table probably 54 // preserves more information about field types than stabs do; for 55 // example, it preserves the fact that a field is a "jlong" rather 56 // than transforming the type according to the typedef in jni_md.h, 57 // which allows the Java-side code to identify "Java-sized" fields in 58 // C++ data structures. If the symbol parsing mechanism was redone 59 // using stabs, it might still be necessary to have a table somewhere 60 // containing this information. 61 // 62 // Do not change the sizes or signedness of the integer values in 63 // these data structures; they are fixed over in the serviceability 64 // agent's Java code (for bootstrapping). 65 66 typedef struct { 67 const char* typeName; // The type name containing the given field (example: "Klass") 68 const char* fieldName; // The field name within the type (example: "_name") 69 const char* typeString; // Quoted name of the type of this field (example: "Symbol*"; 70 // parsed in Java to ensure type correctness 71 int32_t isStatic; // Indicates whether following field is an offset or an address 72 uint64_t offset; // Offset of field within structure; only used for nonstatic fields 73 void* address; // Address of field; only used for static fields 74 // ("offset" can not be reused because of apparent SparcWorks compiler bug 75 // in generation of initializer data) 76 } VMStructEntry; 77 78 typedef struct { 79 const char* typeName; // Type name (example: "Method") 80 const char* superclassName; // Superclass name, or null if none (example: "oopDesc") 81 int32_t isOopType; // Does this type represent an oop typedef? (i.e., "Method*" or 82 // "Klass*", but NOT "Method") 83 int32_t isIntegerType; // Does this type represent an integer type (of arbitrary size)? 84 int32_t isUnsigned; // If so, is it unsigned? 85 uint64_t size; // Size, in bytes, of the type 86 } VMTypeEntry; 87 88 typedef struct { 89 const char* name; // Name of constant (example: "_thread_in_native") 90 int32_t value; // Value of constant 91 } VMIntConstantEntry; 92 93 typedef struct { 94 const char* name; // Name of constant (example: "_thread_in_native") 95 uint64_t value; // Value of constant 96 } VMLongConstantEntry; 97 98 typedef struct { 99 const char* name; // Name of address (example: "SharedRuntime::register_finalizer") 100 void* value; // Value of address 101 } VMAddressEntry; 102 103 // This class is a friend of most classes, to be able to access 104 // private fields 105 class VMStructs { 106 public: 107 // The last entry is identified over in the serviceability agent by 108 // the fact that it has a NULL fieldName 109 static VMStructEntry localHotSpotVMStructs[]; 110 111 // The last entry is identified over in the serviceability agent by 112 // the fact that it has a NULL typeName 113 static VMTypeEntry localHotSpotVMTypes[]; 114 115 // Table of integer constants required by the serviceability agent. 116 // The last entry is identified over in the serviceability agent by 117 // the fact that it has a NULL typeName 118 static VMIntConstantEntry localHotSpotVMIntConstants[]; 119 120 // Table of long constants required by the serviceability agent. 121 // The last entry is identified over in the serviceability agent by 122 // the fact that it has a NULL typeName 123 static VMLongConstantEntry localHotSpotVMLongConstants[]; 124 125 /** 126 * Table of addresses. 127 */ 128 static VMAddressEntry localHotSpotVMAddresses[]; 129 130 // This is used to run any checking code necessary for validation of 131 // the data structure (debug build only) 132 static void init(); 133 134 #ifndef PRODUCT 135 // Execute unit tests 136 static void test(); 137 #endif 138 139 private: 140 // Look up a type in localHotSpotVMTypes using strcmp() (debug build only). 141 // Returns 1 if found, 0 if not. 142 // debug_only(static int findType(const char* typeName);) 143 static int findType(const char* typeName); 144 }; 145 146 // This utility macro quotes the passed string 147 #define QUOTE(x) #x 148 149 //-------------------------------------------------------------------------------- 150 // VMStructEntry macros 151 // 152 153 // This macro generates a VMStructEntry line for a nonstatic field 154 #define GENERATE_NONSTATIC_VM_STRUCT_ENTRY(typeName, fieldName, type) \ 155 { QUOTE(typeName), QUOTE(fieldName), QUOTE(type), 0, offset_of(typeName, fieldName), NULL }, 156 157 // This macro generates a VMStructEntry line for a static field 158 #define GENERATE_STATIC_VM_STRUCT_ENTRY(typeName, fieldName, type) \ 159 { QUOTE(typeName), QUOTE(fieldName), QUOTE(type), 1, 0, &typeName::fieldName }, 160 161 // This macro generates a VMStructEntry line for a static pointer volatile field, 162 // e.g.: "static ObjectMonitor * volatile gBlockList;" 163 #define GENERATE_STATIC_PTR_VOLATILE_VM_STRUCT_ENTRY(typeName, fieldName, type) \ 164 { QUOTE(typeName), QUOTE(fieldName), QUOTE(type), 1, 0, (void *)&typeName::fieldName }, 165 166 // This macro generates a VMStructEntry line for an unchecked 167 // nonstatic field, in which the size of the type is also specified. 168 // The type string is given as NULL, indicating an "opaque" type. 169 #define GENERATE_UNCHECKED_NONSTATIC_VM_STRUCT_ENTRY(typeName, fieldName, size) \ 170 { QUOTE(typeName), QUOTE(fieldName), NULL, 0, offset_of(typeName, fieldName), NULL }, 171 172 // This macro generates a VMStructEntry line for an unchecked 173 // static field, in which the size of the type is also specified. 174 // The type string is given as NULL, indicating an "opaque" type. 175 #define GENERATE_UNCHECKED_STATIC_VM_STRUCT_ENTRY(typeName, fieldName, size) \ 176 { QUOTE(typeName), QUOTE(fieldName), NULL, 1, 0, (void*) &typeName::fieldName }, 177 178 // This macro generates the sentinel value indicating the end of the list 179 #define GENERATE_VM_STRUCT_LAST_ENTRY() \ 180 { NULL, NULL, NULL, 0, 0, NULL } 181 182 // This macro checks the type of a VMStructEntry by comparing pointer types 183 #define CHECK_NONSTATIC_VM_STRUCT_ENTRY(typeName, fieldName, type) \ 184 {typeName *dummyObj = NULL; type* dummy = &dummyObj->fieldName; \ 185 assert(offset_of(typeName, fieldName) < sizeof(typeName), "Illegal nonstatic struct entry, field offset too large"); } 186 187 // This macro checks the type of a volatile VMStructEntry by comparing pointer types 188 #define CHECK_VOLATILE_NONSTATIC_VM_STRUCT_ENTRY(typeName, fieldName, type) \ 189 {typedef type dummyvtype; typeName *dummyObj = NULL; volatile dummyvtype* dummy = &dummyObj->fieldName; } 190 191 // This macro checks the type of a static VMStructEntry by comparing pointer types 192 #define CHECK_STATIC_VM_STRUCT_ENTRY(typeName, fieldName, type) \ 193 {type* dummy = &typeName::fieldName; } 194 195 // This macro checks the type of a static pointer volatile VMStructEntry by comparing pointer types, 196 // e.g.: "static ObjectMonitor * volatile gBlockList;" 197 #define CHECK_STATIC_PTR_VOLATILE_VM_STRUCT_ENTRY(typeName, fieldName, type) \ 198 {type volatile * dummy = &typeName::fieldName; } 199 200 // This macro ensures the type of a field and its containing type are 201 // present in the type table. The assertion string is shorter than 202 // preferable because (incredibly) of a bug in Solstice NFS client 203 // which seems to prevent very long lines from compiling. This assertion 204 // means that an entry in VMStructs::localHotSpotVMStructs[] was not 205 // found in VMStructs::localHotSpotVMTypes[]. 206 #define ENSURE_FIELD_TYPE_PRESENT(typeName, fieldName, type) \ 207 { assert(findType(QUOTE(typeName)) != 0, "type \"" QUOTE(typeName) "\" not found in type table"); \ 208 assert(findType(QUOTE(type)) != 0, "type \"" QUOTE(type) "\" not found in type table"); } 209 210 // This is a no-op macro for unchecked fields 211 #define CHECK_NO_OP(a, b, c) 212 213 214 //-------------------------------------------------------------------------------- 215 // VMTypeEntry macros 216 // 217 218 #define GENERATE_VM_TYPE_ENTRY(type, superclass) \ 219 { QUOTE(type), QUOTE(superclass), 0, 0, 0, sizeof(type) }, 220 221 #define GENERATE_TOPLEVEL_VM_TYPE_ENTRY(type) \ 222 { QUOTE(type), NULL, 0, 0, 0, sizeof(type) }, 223 224 #define GENERATE_OOP_VM_TYPE_ENTRY(type) \ 225 { QUOTE(type), NULL, 1, 0, 0, sizeof(type) }, 226 227 #define GENERATE_INTEGER_VM_TYPE_ENTRY(type) \ 228 { QUOTE(type), NULL, 0, 1, 0, sizeof(type) }, 229 230 #define GENERATE_UNSIGNED_INTEGER_VM_TYPE_ENTRY(type) \ 231 { QUOTE(type), NULL, 0, 1, 1, sizeof(type) }, 232 233 #define GENERATE_VM_TYPE_LAST_ENTRY() \ 234 { NULL, NULL, 0, 0, 0, 0 } 235 236 #define CHECK_VM_TYPE_ENTRY(type, superclass) \ 237 { type* dummyObj = NULL; superclass* dummySuperObj = dummyObj; } 238 239 #define CHECK_VM_TYPE_NO_OP(a) 240 #define CHECK_SINGLE_ARG_VM_TYPE_NO_OP(a) 241 242 243 //-------------------------------------------------------------------------------- 244 // VMIntConstantEntry macros 245 // 246 247 #define GENERATE_VM_INT_CONSTANT_ENTRY(name) \ 248 { QUOTE(name), (int32_t) name }, 249 250 #define GENERATE_VM_INT_CONSTANT_WITH_VALUE_ENTRY(name, value) \ 251 { (name), (int32_t)(value) }, 252 253 #define GENERATE_PREPROCESSOR_VM_INT_CONSTANT_ENTRY(name, value) \ 254 { name, (int32_t) value }, 255 256 // This macro generates the sentinel value indicating the end of the list 257 #define GENERATE_VM_INT_CONSTANT_LAST_ENTRY() \ 258 { NULL, 0 } 259 260 261 //-------------------------------------------------------------------------------- 262 // VMLongConstantEntry macros 263 // 264 265 #define GENERATE_VM_LONG_CONSTANT_ENTRY(name) \ 266 { QUOTE(name), name }, 267 268 #define GENERATE_PREPROCESSOR_VM_LONG_CONSTANT_ENTRY(name, value) \ 269 { name, value }, 270 271 // This macro generates the sentinel value indicating the end of the list 272 #define GENERATE_VM_LONG_CONSTANT_LAST_ENTRY() \ 273 { NULL, 0 } 274 275 276 //-------------------------------------------------------------------------------- 277 // VMAddressEntry macros 278 // 279 280 #define GENERATE_VM_ADDRESS_ENTRY(name) \ 281 { QUOTE(name), (void*) (name) }, 282 283 #define GENERATE_PREPROCESSOR_VM_ADDRESS_ENTRY(name, value) \ 284 { name, (void*) (value) }, 285 286 #define GENERATE_VM_FUNCTION_ENTRY(name) \ 287 { QUOTE(name), CAST_FROM_FN_PTR(void*, &(name)) }, 288 289 // This macro generates the sentinel value indicating the end of the list 290 #define GENERATE_VM_ADDRESS_LAST_ENTRY() \ 291 { NULL, NULL } 292 293 #endif // SHARE_VM_RUNTIME_VMSTRUCTS_HPP