--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/code/codeCache.hpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,391 @@
+/*
+ * Copyright (c) 1997, 2017, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_CODE_CODECACHE_HPP
+#define SHARE_VM_CODE_CODECACHE_HPP
+
+#include "code/codeBlob.hpp"
+#include "code/nmethod.hpp"
+#include "memory/allocation.hpp"
+#include "memory/heap.hpp"
+#include "oops/instanceKlass.hpp"
+#include "oops/oopsHierarchy.hpp"
+#include "runtime/mutexLocker.hpp"
+
+// The CodeCache implements the code cache for various pieces of generated
+// code, e.g., compiled java methods, runtime stubs, transition frames, etc.
+// The entries in the CodeCache are all CodeBlob's.
+
+// -- Implementation --
+// The CodeCache consists of one or more CodeHeaps, each of which contains
+// CodeBlobs of a specific CodeBlobType. Currently heaps for the following
+// types are available:
+// - Non-nmethods: Non-nmethods like Buffers, Adapters and Runtime Stubs
+// - Profiled nmethods: nmethods that are profiled, i.e., those
+// executed at level 2 or 3
+// - Non-Profiled nmethods: nmethods that are not profiled, i.e., those
+// executed at level 1 or 4 and native methods
+// - All: Used for code of all types if code cache segmentation is disabled.
+//
+// In the rare case of the non-nmethod code heap getting full, non-nmethod code
+// will be stored in the non-profiled code heap as a fallback solution.
+//
+// Depending on the availability of compilers and TieredCompilation there
+// may be fewer heaps. The size of the code heaps depends on the values of
+// ReservedCodeCacheSize, NonProfiledCodeHeapSize and ProfiledCodeHeapSize
+// (see CodeCache::heap_available(..) and CodeCache::initialize_heaps(..)
+// for details).
+//
+// Code cache segmentation is controlled by the flag SegmentedCodeCache.
+// If turned off, all code types are stored in a single code heap. By default
+// code cache segmentation is turned on if TieredCompilation is enabled and
+// ReservedCodeCacheSize >= 240 MB.
+//
+// All methods of the CodeCache accepting a CodeBlobType only apply to
+// CodeBlobs of the given type. For example, iteration over the
+// CodeBlobs of a specific type can be done by using CodeCache::first_blob(..)
+// and CodeCache::next_blob(..) and providing the corresponding CodeBlobType.
+//
+// IMPORTANT: If you add new CodeHeaps to the code cache or change the
+// existing ones, make sure to adapt the dtrace scripts (jhelper.d) for
+// Solaris and BSD.
+
+class OopClosure;
+class KlassDepChange;
+
+class CodeCache : AllStatic {
+ friend class VMStructs;
+ friend class JVMCIVMStructs;
+ template <class T, class Filter> friend class CodeBlobIterator;
+ friend class WhiteBox;
+ friend class CodeCacheLoader;
+ private:
+ // CodeHeaps of the cache
+ static GrowableArray<CodeHeap*>* _heaps;
+ static GrowableArray<CodeHeap*>* _compiled_heaps;
+ static GrowableArray<CodeHeap*>* _nmethod_heaps;
+ static GrowableArray<CodeHeap*>* _allocable_heaps;
+
+ static address _low_bound; // Lower bound of CodeHeap addresses
+ static address _high_bound; // Upper bound of CodeHeap addresses
+ static int _number_of_nmethods_with_dependencies; // Total number of nmethods with dependencies
+ static bool _needs_cache_clean; // True if inline caches of the nmethods needs to be flushed
+ static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link()
+
+ static void mark_scavenge_root_nmethods() PRODUCT_RETURN;
+ static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN;
+
+ // CodeHeap management
+ static void initialize_heaps(); // Initializes the CodeHeaps
+ // Check the code heap sizes set by the user via command line
+ static void check_heap_sizes(size_t non_nmethod_size, size_t profiled_size, size_t non_profiled_size, size_t cache_size, bool all_set);
+ // Creates a new heap with the given name and size, containing CodeBlobs of the given type
+ static void add_heap(ReservedSpace rs, const char* name, int code_blob_type);
+ static CodeHeap* get_code_heap_containing(void* p); // Returns the CodeHeap containing the given pointer, or NULL
+ static CodeHeap* get_code_heap(const CodeBlob* cb); // Returns the CodeHeap for the given CodeBlob
+ static CodeHeap* get_code_heap(int code_blob_type); // Returns the CodeHeap for the given CodeBlobType
+ // Returns the name of the VM option to set the size of the corresponding CodeHeap
+ static const char* get_code_heap_flag_name(int code_blob_type);
+ static size_t heap_alignment(); // Returns the alignment of the CodeHeaps in bytes
+ static ReservedCodeSpace reserve_heap_memory(size_t size); // Reserves one continuous chunk of memory for the CodeHeaps
+
+ // Iteration
+ static CodeBlob* first_blob(CodeHeap* heap); // Returns the first CodeBlob on the given CodeHeap
+ static CodeBlob* first_blob(int code_blob_type); // Returns the first CodeBlob of the given type
+ static CodeBlob* next_blob(CodeHeap* heap, CodeBlob* cb); // Returns the next CodeBlob on the given CodeHeap
+
+ static size_t bytes_allocated_in_freelists();
+ static int allocated_segments();
+ static size_t freelists_length();
+
+ static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; }
+ static void prune_scavenge_root_nmethods();
+ static void unlink_scavenge_root_nmethod(nmethod* nm, nmethod* prev);
+
+ // Make private to prevent unsafe calls. Not all CodeBlob*'s are embedded in a CodeHeap.
+ static bool contains(CodeBlob *p) { fatal("don't call me!"); return false; }
+
+ public:
+ // Initialization
+ static void initialize();
+
+ static int code_heap_compare(CodeHeap* const &lhs, CodeHeap* const &rhs);
+
+ static void add_heap(CodeHeap* heap);
+ static const GrowableArray<CodeHeap*>* heaps() { return _heaps; }
+ static const GrowableArray<CodeHeap*>* compiled_heaps() { return _compiled_heaps; }
+ static const GrowableArray<CodeHeap*>* nmethod_heaps() { return _nmethod_heaps; }
+
+ // Allocation/administration
+ static CodeBlob* allocate(int size, int code_blob_type, int orig_code_blob_type = CodeBlobType::All); // allocates a new CodeBlob
+ static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
+ static int alignment_unit(); // guaranteed alignment of all CodeBlobs
+ static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
+ static void free(CodeBlob* cb); // frees a CodeBlob
+ static bool contains(void *p); // returns whether p is included
+ static bool contains(nmethod* nm); // returns whether nm is included
+ static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs
+ static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs
+ static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods
+ static void metadata_do(void f(Metadata* m)); // iterates over metadata in alive nmethods
+
+ // Lookup
+ static CodeBlob* find_blob(void* start); // Returns the CodeBlob containing the given address
+ static CodeBlob* find_blob_unsafe(void* start); // Same as find_blob but does not fail if looking up a zombie method
+ static nmethod* find_nmethod(void* start); // Returns the nmethod containing the given address
+ static CompiledMethod* find_compiled(void* start);
+
+ static int blob_count(); // Returns the total number of CodeBlobs in the cache
+ static int blob_count(int code_blob_type);
+ static int adapter_count(); // Returns the total number of Adapters in the cache
+ static int adapter_count(int code_blob_type);
+ static int nmethod_count(); // Returns the total number of nmethods in the cache
+ static int nmethod_count(int code_blob_type);
+
+ // GC support
+ static void gc_epilogue();
+ static void gc_prologue();
+ static void verify_oops();
+ // If "unloading_occurred" is true, then unloads (i.e., breaks root links
+ // to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
+ // to "true" iff some code got unloaded.
+ static void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
+ static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN;
+
+ // Apply f to every live code blob in scavengable nmethods. Prune nmethods
+ // from the list of scavengable nmethods if f->fix_relocations() and a nmethod
+ // no longer has scavengable oops. If f->fix_relocations(), then f must copy
+ // objects to their new location immediately to avoid fixing nmethods on the
+ // basis of the old object locations.
+ static void scavenge_root_nmethods_do(CodeBlobToOopClosure* f);
+
+ static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; }
+ static void add_scavenge_root_nmethod(nmethod* nm);
+ static void drop_scavenge_root_nmethod(nmethod* nm);
+
+ // Printing/debugging
+ static void print(); // prints summary
+ static void print_internals();
+ static void print_memory_overhead();
+ static void verify(); // verifies the code cache
+ static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN;
+ static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage
+ static void log_state(outputStream* st);
+ static const char* get_code_heap_name(int code_blob_type) { return (heap_available(code_blob_type) ? get_code_heap(code_blob_type)->name() : "Unused"); }
+ static void report_codemem_full(int code_blob_type, bool print);
+
+ // Dcmd (Diagnostic commands)
+ static void print_codelist(outputStream* st);
+ static void print_layout(outputStream* st);
+
+ // The full limits of the codeCache
+ static address low_bound() { return _low_bound; }
+ static address low_bound(int code_blob_type);
+ static address high_bound() { return _high_bound; }
+ static address high_bound(int code_blob_type);
+
+ // Have to use far call instructions to call this pc.
+ static bool is_far_target(address pc);
+
+ // Profiling
+ static size_t capacity();
+ static size_t unallocated_capacity(int code_blob_type);
+ static size_t unallocated_capacity();
+ static size_t max_capacity();
+
+ static double reverse_free_ratio(int code_blob_type);
+
+ static bool needs_cache_clean() { return _needs_cache_clean; }
+ static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; }
+ static void clear_inline_caches(); // clear all inline caches
+ static void cleanup_inline_caches();
+
+ // Returns true if an own CodeHeap for the given CodeBlobType is available
+ static bool heap_available(int code_blob_type);
+
+ // Returns the CodeBlobType for the given CompiledMethod
+ static int get_code_blob_type(CompiledMethod* cm) {
+ return get_code_heap(cm)->code_blob_type();
+ }
+
+ static bool code_blob_type_accepts_compiled(int type) {
+ bool result = type == CodeBlobType::All || type <= CodeBlobType::MethodProfiled;
+ AOT_ONLY( result = result || type == CodeBlobType::AOT; )
+ return result;
+ }
+
+ static bool code_blob_type_accepts_nmethod(int type) {
+ return type == CodeBlobType::All || type <= CodeBlobType::MethodProfiled;
+ }
+
+ static bool code_blob_type_accepts_allocable(int type) {
+ return type <= CodeBlobType::All;
+ }
+
+
+ // Returns the CodeBlobType for the given compilation level
+ static int get_code_blob_type(int comp_level) {
+ if (comp_level == CompLevel_none ||
+ comp_level == CompLevel_simple ||
+ comp_level == CompLevel_full_optimization) {
+ // Non profiled methods
+ return CodeBlobType::MethodNonProfiled;
+ } else if (comp_level == CompLevel_limited_profile ||
+ comp_level == CompLevel_full_profile) {
+ // Profiled methods
+ return CodeBlobType::MethodProfiled;
+ }
+ ShouldNotReachHere();
+ return 0;
+ }
+
+ static void verify_clean_inline_caches();
+ static void verify_icholder_relocations();
+
+ // Deoptimization
+ private:
+ static int mark_for_deoptimization(KlassDepChange& changes);
+#ifdef HOTSWAP
+ static int mark_for_evol_deoptimization(InstanceKlass* dependee);
+#endif // HOTSWAP
+
+ public:
+ static void mark_all_nmethods_for_deoptimization();
+ static int mark_for_deoptimization(Method* dependee);
+ static void make_marked_nmethods_not_entrant();
+
+ // Flushing and deoptimization
+ static void flush_dependents_on(InstanceKlass* dependee);
+#ifdef HOTSWAP
+ // Flushing and deoptimization in case of evolution
+ static void flush_evol_dependents_on(InstanceKlass* dependee);
+#endif // HOTSWAP
+ // Support for fullspeed debugging
+ static void flush_dependents_on_method(const methodHandle& dependee);
+
+ // tells how many nmethods have dependencies
+ static int number_of_nmethods_with_dependencies();
+
+ static int get_codemem_full_count(int code_blob_type) {
+ CodeHeap* heap = get_code_heap(code_blob_type);
+ return (heap != NULL) ? heap->full_count() : 0;
+ }
+};
+
+
+// Iterator to iterate over nmethods in the CodeCache.
+template <class T, class Filter> class CodeBlobIterator : public StackObj {
+ private:
+ CodeBlob* _code_blob; // Current CodeBlob
+ GrowableArrayIterator<CodeHeap*> _heap;
+ GrowableArrayIterator<CodeHeap*> _end;
+
+ public:
+ CodeBlobIterator(T* nm = NULL) {
+ if (Filter::heaps() == NULL) {
+ return;
+ }
+ _heap = Filter::heaps()->begin();
+ _end = Filter::heaps()->end();
+ // If set to NULL, initialized by first call to next()
+ _code_blob = (CodeBlob*)nm;
+ if (nm != NULL) {
+ while(!(*_heap)->contains_blob(_code_blob)) {
+ ++_heap;
+ }
+ assert((*_heap)->contains_blob(_code_blob), "match not found");
+ }
+ }
+
+ // Advance iterator to next blob
+ bool next() {
+ assert_locked_or_safepoint(CodeCache_lock);
+
+ bool result = next_blob();
+ while (!result && _heap != _end) {
+ // Advance to next code heap of segmented code cache
+ if (++_heap == _end) {
+ break;
+ }
+ result = next_blob();
+ }
+
+ return result;
+ }
+
+ // Advance iterator to next alive blob
+ bool next_alive() {
+ bool result = next();
+ while(result && !_code_blob->is_alive()) {
+ result = next();
+ }
+ return result;
+ }
+
+ bool end() const { return _code_blob == NULL; }
+ T* method() const { return (T*)_code_blob; }
+
+private:
+
+ // Advance iterator to the next blob in the current code heap
+ bool next_blob() {
+ if (_heap == _end) {
+ return false;
+ }
+ CodeHeap *heap = *_heap;
+ // Get first method CodeBlob
+ if (_code_blob == NULL) {
+ _code_blob = CodeCache::first_blob(heap);
+ if (_code_blob == NULL) {
+ return false;
+ } else if (Filter::apply(_code_blob)) {
+ return true;
+ }
+ }
+ // Search for next method CodeBlob
+ _code_blob = CodeCache::next_blob(heap, _code_blob);
+ while (_code_blob != NULL && !Filter::apply(_code_blob)) {
+ _code_blob = CodeCache::next_blob(heap, _code_blob);
+ }
+ return _code_blob != NULL;
+ }
+};
+
+
+struct CompiledMethodFilter {
+ static bool apply(CodeBlob* cb) { return cb->is_compiled(); }
+ static const GrowableArray<CodeHeap*>* heaps() { return CodeCache::compiled_heaps(); }
+};
+
+
+struct NMethodFilter {
+ static bool apply(CodeBlob* cb) { return cb->is_nmethod(); }
+ static const GrowableArray<CodeHeap*>* heaps() { return CodeCache::nmethod_heaps(); }
+};
+
+
+typedef CodeBlobIterator<CompiledMethod, CompiledMethodFilter> CompiledMethodIterator;
+typedef CodeBlobIterator<nmethod, NMethodFilter> NMethodIterator;
+
+#endif // SHARE_VM_CODE_CODECACHE_HPP