src/share/vm/code/codeCache.hpp
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*** old/src/share/vm/code/codeCache.hpp Tue Jun 3 09:37:20 2014
--- new/src/share/vm/code/codeCache.hpp Tue Jun 3 09:37:20 2014
*** 28,132 ****
--- 28,145 ----
#include "code/codeBlob.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:
// - 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 one or more CodeHeaps, each of which contains
+ // CodeBlobs of a specific CodeBlobType. Currently heaps for the following
+ // types are available:
+ // - Non-methods: Non-methods 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.
+ //
+ // 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 DepChange;
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 _codemem_full_count;
! static size_t bytes_allocated_in_freelist() { return _heap->allocated_in_freelist(); }
static int allocated_segments() { return _heap->allocated_segments(); }
! static size_t freelist_length() { return _heap->freelist_length(); }
+ // 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
+
+ static size_t bytes_allocated_in_freelists();
+ static int allocated_segments();
+ static size_t freelists_length();
+ 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 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
// 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 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); }
+
! 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();
*** 153,180 ****
--- 166,213 ----
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);
// 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);
+ 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::MethodNonProfiled;
+ } else if (comp_level == CompLevel_limited_profile ||
+ comp_level == CompLevel_full_profile) {
+ // Profiled methods
+ return CodeBlobType::MethodProfiled;
+ }
+ ShouldNotReachHere();
+ return 0;
+ }
+
// Deoptimization
static int mark_for_deoptimization(DepChange& changes);
#ifdef HOTSWAP
static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
#endif // HOTSWAP
*** 188,193 ****
--- 221,288 ----
static int number_of_nmethods_with_dependencies();
static int get_codemem_full_count() { return _codemem_full_count; }
};
+
+ // Iterator to iterate over nmethods in the CodeCache.
+ class NMethodIterator : public StackObj {
+ private:
+ int _code_blob_type; // Refers to current CodeHeap
+ CodeBlob* _code_blob; // Current CodeBlob
+
+ public:
+ NMethodIterator() {
+ if (SegmentedCodeCache) {
+ // Only iterate over method code heaps
+ _code_blob_type = CodeBlobType::MethodNonProfiled;
+ } else {
+ // Iterate over all CodeBlobs
+ _code_blob_type = CodeBlobType::All;
+ }
+ // Initialize to NULL, first call to next() sets _code_blob
+ _code_blob = NULL;
+ }
+
+ // Advance iterator to next nmethod
+ bool next() {
+ assert_locked_or_safepoint(CodeCache_lock);
+ assert(_code_blob_type < CodeBlobType::NumTypes, "end reached");
+
+ if (SegmentedCodeCache) {
+ // Code cache is segmented, iterate over all method heaps
+ // Get first CodeBlob
+ if (_code_blob == NULL) {
+ _code_blob = CodeCache::first_blob(_code_blob_type);
+ return _code_blob != NULL;
+ }
+ // Get next CodeBlob
+ _code_blob = CodeCache::next_blob(_code_blob, _code_blob_type);
+ while (_code_blob == NULL && _code_blob_type < CodeBlobType::MethodProfiled) {
+ // Advance to next CodeBlobType if CodeBlob is NULL
+ _code_blob_type++;
+ _code_blob = CodeCache::first_blob(_code_blob_type);
+ }
+ } else {
+ // Code cache is not segmented, search for method code blobs
+ // Get first method CodeBlob
+ if (_code_blob == NULL) {
+ _code_blob = CodeCache::first_blob(_code_blob_type);
+ if (_code_blob->is_nmethod()) {
+ return true;
+ }
+ }
+ // Search for next method CodeBlob
+ _code_blob = CodeCache::next_blob(_code_blob, _code_blob_type);
+ while (_code_blob != NULL && !_code_blob->is_nmethod()) {
+ _code_blob = CodeCache::next_blob(_code_blob, _code_blob_type);
+ }
+ }
+ // End reached?
+ return _code_blob != NULL;
+ }
+
+ bool end() const { return _code_blob == NULL; }
+ nmethod* method() const { return (nmethod*)_code_blob; }
+ };
+
#endif // SHARE_VM_CODE_CODECACHE_HPP
src/share/vm/code/codeCache.hpp
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