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6964458: Reimplement class meta-data storage to use native memory

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Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes

Co-authored-by: Stefan Karlsson <stefan.karlsson@oracle.com>
Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com>
Co-authored-by: Tom Rodriguez <tom.rodriguez@oracle.com>
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
This commit is contained in:
Jon Masamitsu 2012-09-01 13:25:18 -04:00 • committed by Coleen Phillimore
parent 36eee7c8c8
commit 5c58d27aac
853 changed files with 26124 additions and 82956 deletions
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29
hotspot/src/share/vm/oops/symbol.cpp
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@ -24,10 +24,12 @@
#include "precompiled.hpp"
#include "oops/oop.inline.hpp"
#include "classfile/altHashing.hpp"
#include "classfile/classLoaderData.hpp"
#include "oops/symbol.hpp"
#include "runtime/os.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/resourceArea.hpp"
Symbol::Symbol(const u1* name, int length, int refcount) : _refcount(refcount), _length(length) {
_identity_hash = os::random();
@ -37,19 +39,30 @@ Symbol::Symbol(const u1* name, int length, int refcount) : _refcount(refcount),
}
void* Symbol::operator new(size_t sz, int len, TRAPS) {
int alloc_size = object_size(len)*HeapWordSize;
int alloc_size = size(len)*HeapWordSize;
address res = (address) AllocateHeap(alloc_size, mtSymbol);
DEBUG_ONLY(set_allocation_type(res, ResourceObj::C_HEAP);)
return res;
}
void* Symbol::operator new(size_t sz, int len, Arena* arena, TRAPS) {
int alloc_size = object_size(len)*HeapWordSize;
int alloc_size = size(len)*HeapWordSize;
address res = (address)arena->Amalloc(alloc_size);
DEBUG_ONLY(set_allocation_type(res, ResourceObj::ARENA);)
return res;
}
void* Symbol::operator new(size_t sz, int len, ClassLoaderData* loader_data, TRAPS) {
address res;
int alloc_size = size(len)*HeapWordSize;
res = (address) Metaspace::allocate(loader_data, size(len), true,
Metaspace::NonClassType, CHECK_NULL);
return res;
}
void Symbol::operator delete(void *p) {
assert(((Symbol*)p)->refcount() == 0, "should not call this");
FreeHeap(p);
}
// ------------------------------------------------------------------
// Symbol::equals
//
@ -191,6 +204,12 @@ const char* Symbol::as_klass_external_name() const {
return str;
}
// Alternate hashing for unbalanced symbol tables.
unsigned int Symbol::new_hash(jint seed) {
ResourceMark rm;
// Use alternate hashing algorithm on this symbol.
return AltHashing::murmur3_32(seed, (const jbyte*)as_C_string(), utf8_length());
}
void Symbol::print_on(outputStream* st) const {
if (this == NULL) {