author | coleenp |
Sat, 01 Sep 2012 13:25:18 -0400 | |
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parent 13195 | be27e1b6a4b9 |
child 13878 | 6e6a462a6cff |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_CODE_CODECACHE_HPP |
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#define SHARE_VM_CODE_CODECACHE_HPP |
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#include "code/codeBlob.hpp" |
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#include "memory/allocation.hpp" |
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#include "memory/heap.hpp" |
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#include "oops/instanceKlass.hpp" |
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#include "oops/oopsHierarchy.hpp" |
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// The CodeCache implements the code cache for various pieces of generated |
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// code, e.g., compiled java methods, runtime stubs, transition frames, etc. |
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// The entries in the CodeCache are all CodeBlob's. |
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// Implementation: |
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// - Each CodeBlob occupies one chunk of memory. |
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// - Like the offset table in oldspace the zone has at table for |
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// locating a method given a addess of an instruction. |
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class OopClosure; |
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class DepChange; |
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class CodeCache : AllStatic { |
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friend class VMStructs; |
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private: |
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// CodeHeap is malloc()'ed at startup and never deleted during shutdown, |
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// so that the generated assembly code is always there when it's needed. |
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// This may cause memory leak, but is necessary, for now. See 4423824, |
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// 4422213 or 4436291 for details. |
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static CodeHeap * _heap; |
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static int _number_of_blobs; |
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static int _number_of_adapters; |
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static int _number_of_nmethods; |
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static int _number_of_nmethods_with_dependencies; |
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static bool _needs_cache_clean; |
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static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link() |
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static nmethod* _saved_nmethods; // linked via nm->saved_nmethod_look() |
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static void verify_if_often() PRODUCT_RETURN; |
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static void mark_scavenge_root_nmethods() PRODUCT_RETURN; |
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static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN; |
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public: |
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// Initialization |
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static void initialize(); |
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// Allocation/administration |
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static CodeBlob* allocate(int size); // allocates a new CodeBlob |
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static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled |
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static int alignment_unit(); // guaranteed alignment of all CodeBlobs |
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static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header) |
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static void free(CodeBlob* cb); // frees a CodeBlob |
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static void flush(); // flushes all CodeBlobs |
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static bool contains(void *p); // returns whether p is included |
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static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs |
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static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs |
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static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods |
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static void alive_nmethods_do(void f(nmethod* nm)); // iterates over all alive nmethods |
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// Lookup |
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static CodeBlob* find_blob(void* start); |
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static nmethod* find_nmethod(void* start); |
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// Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know |
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// what you are doing) |
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static CodeBlob* find_blob_unsafe(void* start) { |
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// NMT can walk the stack before code cache is created |
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if (_heap == NULL) return NULL; |
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CodeBlob* result = (CodeBlob*)_heap->find_start(start); |
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// this assert is too strong because the heap code will return the |
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// heapblock containing start. That block can often be larger than |
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// the codeBlob itself. If you look up an address that is within |
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// the heapblock but not in the codeBlob you will assert. |
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// |
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// Most things will not lookup such bad addresses. However |
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// AsyncGetCallTrace can see intermediate frames and get that kind |
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// of invalid address and so can a developer using hsfind. |
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// |
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// The more correct answer is to return NULL if blob_contains() returns |
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// false. |
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// assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob"); |
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if (result != NULL && !result->blob_contains((address)start)) { |
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result = NULL; |
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} |
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return result; |
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} |
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// Iteration |
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static CodeBlob* first(); |
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static CodeBlob* next (CodeBlob* cb); |
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static CodeBlob* alive(CodeBlob *cb); |
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static nmethod* alive_nmethod(CodeBlob *cb); |
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static nmethod* first_nmethod(); |
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static nmethod* next_nmethod (CodeBlob* cb); |
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static int nof_blobs() { return _number_of_blobs; } |
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static int nof_adapters() { return _number_of_adapters; } |
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static int nof_nmethods() { return _number_of_nmethods; } |
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// GC support |
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static void gc_epilogue(); |
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static void gc_prologue(); |
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static void verify_oops(); |
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// If "unloading_occurred" is true, then unloads (i.e., breaks root links |
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// to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading" |
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// to "true" iff some code got unloaded. |
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static void do_unloading(BoolObjectClosure* is_alive, |
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OopClosure* keep_alive, |
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bool unloading_occurred); |
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static void oops_do(OopClosure* f) { |
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CodeBlobToOopClosure oopc(f, /*do_marking=*/ false); |
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blobs_do(&oopc); |
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} |
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static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN; |
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static void scavenge_root_nmethods_do(CodeBlobClosure* f); |
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static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; } |
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static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; } |
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static void add_scavenge_root_nmethod(nmethod* nm); |
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static void drop_scavenge_root_nmethod(nmethod* nm); |
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static void prune_scavenge_root_nmethods(); |
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// Printing/debugging |
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static void print() PRODUCT_RETURN; // prints summary |
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static void print_internals(); |
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static void verify(); // verifies the code cache |
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static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN; |
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static void print_bounds(outputStream* st); // Prints a summary of the bounds of the code cache |
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static void log_state(outputStream* st); |
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// The full limits of the codeCache |
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static address low_bound() { return (address) _heap->low_boundary(); } |
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static address high_bound() { return (address) _heap->high_boundary(); } |
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// Profiling |
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static address first_address(); // first address used for CodeBlobs |
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static address last_address(); // last address used for CodeBlobs |
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static size_t capacity() { return _heap->capacity(); } |
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static size_t max_capacity() { return _heap->max_capacity(); } |
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static size_t unallocated_capacity() { return _heap->unallocated_capacity(); } |
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static size_t largest_free_block(); |
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static bool needs_flushing() { return largest_free_block() < CodeCacheFlushingMinimumFreeSpace; } |
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static bool needs_cache_clean() { return _needs_cache_clean; } |
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static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; } |
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static void clear_inline_caches(); // clear all inline caches |
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static nmethod* find_and_remove_saved_code(Method* m); |
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static void remove_saved_code(nmethod* nm); |
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static void speculatively_disconnect(nmethod* nm); |
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// Deoptimization |
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static int mark_for_deoptimization(DepChange& changes); |
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#ifdef HOTSWAP |
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static int mark_for_evol_deoptimization(instanceKlassHandle dependee); |
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#endif // HOTSWAP |
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static void mark_all_nmethods_for_deoptimization(); |
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static int mark_for_deoptimization(Method* dependee); |
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static void make_marked_nmethods_zombies(); |
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static void make_marked_nmethods_not_entrant(); |
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// tells how many nmethods have dependencies |
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static int number_of_nmethods_with_dependencies(); |
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}; |
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#endif // SHARE_VM_CODE_CODECACHE_HPP |