Mercurial > hg > truffle
annotate src/share/vm/runtime/vmStructs.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
| author | johnc |
|---|---|
| date | Wed, 18 Aug 2010 10:59:06 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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| 13 * accompanied this code). | |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 // This table encapsulates the debugging information required by the | |
| 26 // serviceability agent in order to run. Specifically, we need to | |
| 27 // understand the layout of certain C data structures (offsets, in | |
| 28 // bytes, of their fields.) | |
| 29 // | |
| 30 // There are alternatives for the design of this mechanism, including | |
| 31 // parsing platform-specific debugging symbols from a debug build into | |
| 32 // a program database. While this current mechanism can be considered | |
| 33 // to be a workaround for the inability to debug arbitrary C and C++ | |
| 34 // programs at the present time, it does have certain advantages. | |
| 35 // First, it is platform-independent, which will vastly simplify the | |
| 36 // initial bringup of the system both now and on future platforms. | |
| 37 // Second, it is embedded within the VM, as opposed to being in a | |
| 38 // separate program database; experience has shown that whenever | |
| 39 // portions of a system are decoupled, version skew is problematic. | |
| 40 // Third, generating a program database, for example for a product | |
| 41 // build, would probably require two builds to be done: the desired | |
| 42 // product build as well as an intermediary build with the PRODUCT | |
| 43 // flag turned on but also compiled with -g, leading to a doubling of | |
| 44 // the time required to get a serviceability agent-debuggable product | |
| 45 // build. Fourth, and very significantly, this table probably | |
| 46 // preserves more information about field types than stabs do; for | |
| 47 // example, it preserves the fact that a field is a "jlong" rather | |
| 48 // than transforming the type according to the typedef in jni_md.h, | |
| 49 // which allows the Java-side code to identify "Java-sized" fields in | |
| 50 // C++ data structures. If the symbol parsing mechanism was redone | |
| 51 // using stabs, it might still be necessary to have a table somewhere | |
| 52 // containing this information. | |
| 53 // | |
| 54 // Do not change the sizes or signedness of the integer values in | |
| 55 // these data structures; they are fixed over in the serviceability | |
| 56 // agent's Java code (for bootstrapping). | |
| 57 | |
| 58 typedef struct { | |
| 59 const char* typeName; // The type name containing the given field (example: "Klass") | |
| 60 const char* fieldName; // The field name within the type (example: "_name") | |
| 61 const char* typeString; // Quoted name of the type of this field (example: "symbolOopDesc*"; | |
| 62 // parsed in Java to ensure type correctness | |
| 63 int32_t isStatic; // Indicates whether following field is an offset or an address | |
| 64 uint64_t offset; // Offset of field within structure; only used for nonstatic fields | |
| 65 void* address; // Address of field; only used for static fields | |
| 66 // ("offset" can not be reused because of apparent SparcWorks compiler bug | |
| 67 // in generation of initializer data) | |
| 68 } VMStructEntry; | |
| 69 | |
| 70 typedef struct { | |
| 71 const char* typeName; // Type name (example: "methodOopDesc") | |
| 72 const char* superclassName; // Superclass name, or null if none (example: "oopDesc") | |
| 73 int32_t isOopType; // Does this type represent an oop typedef? (i.e., "methodOop" or | |
| 74 // "klassOop", but NOT "methodOopDesc") | |
| 75 int32_t isIntegerType; // Does this type represent an integer type (of arbitrary size)? | |
| 76 int32_t isUnsigned; // If so, is it unsigned? | |
| 77 uint64_t size; // Size, in bytes, of the type | |
| 78 } VMTypeEntry; | |
| 79 | |
| 80 typedef struct { | |
| 81 const char* name; // Name of constant (example: "_thread_in_native") | |
| 82 int32_t value; // Value of constant | |
| 83 } VMIntConstantEntry; | |
| 84 | |
| 85 typedef struct { | |
| 86 const char* name; // Name of constant (example: "_thread_in_native") | |
| 87 uint64_t value; // Value of constant | |
| 88 } VMLongConstantEntry; | |
| 89 | |
| 90 // This class is a friend of most classes, to be able to access | |
| 91 // private fields | |
| 92 class VMStructs { | |
| 93 public: | |
| 94 // The last entry is identified over in the serviceability agent by | |
| 95 // the fact that it has a NULL fieldName | |
| 96 static VMStructEntry localHotSpotVMStructs[]; | |
| 97 | |
| 98 // The last entry is identified over in the serviceability agent by | |
| 99 // the fact that it has a NULL typeName | |
| 100 static VMTypeEntry localHotSpotVMTypes[]; | |
| 101 | |
| 102 // Table of integer constants required by the serviceability agent. | |
| 103 // The last entry is identified over in the serviceability agent by | |
| 104 // the fact that it has a NULL typeName | |
| 105 static VMIntConstantEntry localHotSpotVMIntConstants[]; | |
| 106 | |
| 107 // Table of long constants required by the serviceability agent. | |
| 108 // The last entry is identified over in the serviceability agent by | |
| 109 // the fact that it has a NULL typeName | |
| 110 static VMLongConstantEntry localHotSpotVMLongConstants[]; | |
| 111 | |
| 112 // This is used to run any checking code necessary for validation of | |
| 113 // the data structure (debug build only) | |
| 114 static void init(); | |
| 115 | |
| 116 private: | |
| 117 // Look up a type in localHotSpotVMTypes using strcmp() (debug build only). | |
| 118 // Returns 1 if found, 0 if not. | |
| 119 // debug_only(static int findType(const char* typeName);) | |
| 120 static int findType(const char* typeName); | |
| 121 }; |