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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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14
hotspot/src/share/vm/memory/filemap.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2003, 2012, 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
@ -25,8 +25,7 @@
#ifndef SHARE_VM_MEMORY_FILEMAP_HPP
#define SHARE_VM_MEMORY_FILEMAP_HPP
#include "memory/compactingPermGenGen.hpp"
#include "memory/space.hpp"
#include "memory/metaspaceShared.hpp"
// Layout of the file:
// header: dump of archive instance plus versioning info, datestamp, etc.
@ -43,6 +42,7 @@ static const int JVM_IDENT_MAX = 256;
static const int JVM_ARCH_MAX = 12;
class Metaspace;
class FileMapInfo : public CHeapObj<mtInternal> {
private:
@ -71,7 +71,7 @@ private:
size_t _used; // for setting space top on read
bool _read_only; // read only space?
bool _allow_exec; // executable code in space?
} _space[CompactingPermGenGen::n_regions];
} _space[MetaspaceShared::n_regions];
// The following fields are all sanity checks for whether this archive
// will function correctly with this JVM and the bootclasspath it's
@ -120,17 +120,17 @@ public:
bool open_for_read();
void open_for_write();
void write_header();
void write_space(int i, CompactibleSpace* space, bool read_only);
void write_space(int i, Metaspace* space, bool read_only);
void write_region(int region, char* base, size_t size,
size_t capacity, bool read_only, bool allow_exec);
void write_bytes(const void* buffer, int count);
void write_bytes_aligned(const void* buffer, int count);
bool map_space(int i, ReservedSpace rs, ContiguousSpace *space);
char* map_region(int i, ReservedSpace rs);
char* map_region(int i, bool address_must_match);
char* map_region(int i);
void unmap_region(int i);
void close();
bool is_open() { return _file_open; }
ReservedSpace reserve_shared_memory();
// JVM/TI RedefineClasses() support:
// Remap the shared readonly space to shared readwrite, private.