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8241071: Generation of classes.jsa with -Xshare:dump is not deterministic

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Reviewed-by: dholmes, stuefe
This commit is contained in:
Ioi Lam 2020-05-05 11:10:02 -07:00
parent 957eb270f0
commit eadcb08c3c
20 changed files with 369 additions and 92 deletions
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23
src/hotspot/share/prims/jvm.cpp
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@ -3733,6 +3733,29 @@ JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
HeapShared::initialize_from_archived_subgraph(k);
JVM_END
JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump())
JVMWrapper("JVM_GetRandomSeedForCDSDump");
if (DumpSharedSpaces) {
const char* release = Abstract_VM_Version::vm_release();
const char* dbg_level = Abstract_VM_Version::jdk_debug_level();
const char* version = VM_Version::internal_vm_info_string();
jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
seed += (jlong)Abstract_VM_Version::vm_major_version();
seed += (jlong)Abstract_VM_Version::vm_minor_version();
seed += (jlong)Abstract_VM_Version::vm_security_version();
seed += (jlong)Abstract_VM_Version::vm_patch_version();
if (seed == 0) { // don't let this ever be zero.
seed = 0x87654321;
}
log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed);
return seed;
} else {
return 0;
}
JVM_END
// Returns an array of all live Thread objects (VM internal JavaThreads,
// jvmti agent threads, and JNI attaching threads are skipped)
// See CR 6404306 regarding JNI attaching threads