src/share/vm/code/codeCache.hpp
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*** old/src/share/vm/code/codeCache.hpp	Wed Oct  9 15:17:14 2013
--- new/src/share/vm/code/codeCache.hpp	Wed Oct  9 15:17:14 2013

*** 33,132 **** --- 33,151 ---- // 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: // - Each CodeBlob occupies one chunk of memory. // - Like the offset table in oldspace the zone has at table for // locating a method given a addess of an instruction. + // -- Implementation -- + // The CodeCache consists of multiple CodeHeaps, each of which contains + // CodeBlobs of a specific CodeBlobType. Currently heaps for the following + // types are available: + // - Non-Profiled methods: nmethods that are not profiled, i.e., those + // compiled at tier 1 or 4 and native methods + // - Profiled methods: nmethods that are profiled, i.e., those + // compiled at tier 2 or 3 + // - Non-methods: Non-methods like Buffers, Adapters and Runtime Stubs + // + // Depending on the availability of compilers and TieredCompilation being + // deactivated there may be fewer heaps. The size of the heaps depends on + // the values of ReservedCodeCacheSize, NonProfiledCodeHeapSize and + // ProfiledCodeHeapSize (see CodeCache::initialize_heaps for details). + // + // 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 DepChange; + class HeapConfiguration; class CodeCache : AllStatic { friend class VMStructs; private: // CodeHeap is malloc()'ed at startup and never deleted during shutdown, // so that the generated assembly code is always there when it's needed. // This may cause memory leak, but is necessary, for now. See 4423824, // 4422213 or 4436291 for details. static CodeHeap * _heap; ! static int _number_of_blobs; static int _number_of_adapters; ! static int _number_of_nmethods; static int _number_of_nmethods_with_dependencies; static bool _needs_cache_clean; + // Predicate returning true for all method heaps + class IsMethodPredicate { + public: + bool operator()(const CodeHeap* heap) { + return heap->accepts(CodeBlobType::MethodProfile) ! || heap->accepts(CodeBlobType::MethodNoProfile); + } ! }; + + // CodeHeaps of the cache + static GrowableArray<CodeHeap*>* _heaps; + + static address _low_bound; // Lower bound of CodeHeap addresses + static address _high_bound; // Upper bound of CodeHeap addresses + static int _number_of_blobs; // Total number of CodeBlobs in the cache + static int _number_of_adapters; // Total number of Adapters in the cache + static int _number_of_nmethods; // Total number of nmethods in the cache + 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 nmethod* _saved_nmethods; // Linked list of speculatively disconnected nmethods. + static int _codemem_full_count; // Number of times a CodeHeap in the cache was full + // CodeHeap verification static void verify_if_often() PRODUCT_RETURN; static void mark_scavenge_root_nmethods() PRODUCT_RETURN; static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN; static int _codemem_full_count; + // CodeHeap management + static void initialize_heaps(); // Initializes the CodeHeaps + // 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, size_t size_initial, int code_blob_type); + static CodeHeap* get_code_heap(int code_blob_type); // Returns the CodeHeap for the given CodeBlobType + static bool heap_available(int code_blob_type); // Returns true if a CodeHeap for the given CodeBlobType is available + static ReservedCodeSpace reserve_heap_memory(size_t size); // Reserves one continuous chunk of memory for the CodeHeaps public: + // Iteration + static CodeBlob* first_blob(CodeHeap* heap); // Returns the first CodeBlob on the given CodeHeap + static CodeBlob* next_blob(CodeHeap* heap, CodeBlob* cb); // Returns the first alive CodeBlob on the given CodeHeap + static CodeBlob* first_alive_blob(CodeHeap* heap); // Returns the next CodeBlob on the given CodeHeap succeeding the given CodeBlob + static CodeBlob* next_alive_blob(CodeHeap* heap, CodeBlob* cb); // Returns the next alive CodeBlob on the given CodeHeap succeeding the given CodeBlob + public: // Initialization static void initialize(); static void report_codemem_full(); // Allocation/administration ! static CodeBlob* allocate(int size, int code_blob_type, bool is_critical = false); // 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 void flush(); // flushes all CodeBlobs ! static void free(CodeBlob* cb, int code_blob_type); // frees a CodeBlob static bool contains(void *p); // returns whether p 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 alive_nmethods_do(void f(nmethod* nm)); // iterates over all alive nmethods // Lookup ! static CodeBlob* find_blob(void* start); // Returns the CodeBlob containing the given address ! static nmethod* find_nmethod(void* start); // Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know // what you are doing) static CodeBlob* find_blob_unsafe(void* start) { // NMT can walk the stack before code cache is created if (_heap == NULL) return NULL; CodeBlob* result = (CodeBlob*)_heap->find_start(start); // this assert is too strong because the heap code will return the // heapblock containing start. That block can often be larger than // the codeBlob itself. If you look up an address that is within // the heapblock but not in the codeBlob you will assert. // // Most things will not lookup such bad addresses. However // AsyncGetCallTrace can see intermediate frames and get that kind // of invalid address and so can a developer using hsfind. // // The more correct answer is to return NULL if blob_contains() returns // false. // assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob"); if (result != NULL && !result->blob_contains((address)start)) { result = NULL; } return result; } ! 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 bool contains_nmethod(nmethod* nm); // Returns true if the CodeCache contains the given nmethod // Iteration static CodeBlob* first(); ! static CodeBlob* next (CodeBlob* cb); static CodeBlob* alive(CodeBlob *cb); ! static nmethod* alive_nmethod(CodeBlob *cb); static nmethod* first_nmethod(); ! static nmethod* next_nmethod (CodeBlob* cb); static int nof_blobs() { return _number_of_blobs; } ! static int nof_adapters() { return _number_of_adapters; } static int nof_nmethods() { return _number_of_nmethods; } + // Returns the first CodeBlob of the given type ! static CodeBlob* first_blob(int code_blob_type) { return first_blob(get_code_heap(code_blob_type)); } + // Returns the first alive CodeBlob of the given type ! static CodeBlob* first_alive_blob(int code_blob_type) { return first_alive_blob(get_code_heap(code_blob_type)); } + // Returns the next CodeBlob of the given type succeeding the given CodeBlob ! static CodeBlob* next_blob(CodeBlob* cb, int code_blob_type) { return next_blob(get_code_heap(code_blob_type), cb); } + // Returns the next alive CodeBlob of the given type succeeding the given CodeBlob ! static CodeBlob* next_alive_blob(CodeBlob* cb, int code_blob_type) { return next_alive_blob(get_code_heap(code_blob_type), cb); } + + static int nof_blobs() { return _number_of_blobs; } // Returns the total number of CodeBlobs in the cache + static int nof_adapters() { return _number_of_adapters; } // Returns the total number of Adapters in the cache + static int nof_nmethods() { return _number_of_nmethods; } // Returns the total number of nmethods in the cache // GC support static void gc_epilogue(); static void gc_prologue(); static void verify_oops();
*** 152,178 **** --- 171,216 ---- static void print_internals(); 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_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); // The full limits of the codeCache ! static address low_bound() { return (address) _heap->low_boundary(); } ! static address high_bound() { return (address) _heap->high_boundary(); } static address high() { return (address) _heap->high(); } ! static address low_bound() { return _low_bound; } ! static address high_bound() { return _high_bound; } // Profiling ! static address first_address(); // first address used for CodeBlobs ! static address last_address(); // last address used for CodeBlobs ! static size_t capacity() { return _heap->capacity(); } ! static size_t max_capacity() { return _heap->max_capacity(); } ! static size_t unallocated_capacity() { return _heap->unallocated_capacity(); } ! static double reverse_free_ratio(); ! static size_t capacity(int code_blob_type) { return heap_available(code_blob_type) ? get_code_heap(code_blob_type)->capacity() : 0; } ! static size_t capacity(); ! static size_t unallocated_capacity(int code_blob_type) { return heap_available(code_blob_type) ? get_code_heap(code_blob_type)->unallocated_capacity() : 0; } ! static size_t unallocated_capacity(); ! static size_t max_capacity(int code_blob_type) { return heap_available(code_blob_type) ? get_code_heap(code_blob_type)->max_capacity() : 0; } ! static size_t max_capacity(); + + static bool is_full(int code_blob_type) { return heap_available(code_blob_type) && (unallocated_capacity(code_blob_type) < CodeCacheMinimumFreeSpace); } + 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 + + // Returns the CodeBlobType for nmethods of 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::MethodNoProfile; + } else if (comp_level == CompLevel_limited_profile || + comp_level == CompLevel_full_profile) { + // Profiled methods + return CodeBlobType::MethodProfile; + } + ShouldNotReachHere(); + return 0; + } // Deoptimization static int mark_for_deoptimization(DepChange& changes); #ifdef HOTSWAP static int mark_for_evol_deoptimization(instanceKlassHandle dependee);

src/share/vm/code/codeCache.hpp
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