--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/code/compiledMethod.hpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,405 @@
+/*
+ * Copyright (c) 2015, 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_COMPILEDMETHOD_HPP
+#define SHARE_VM_CODE_COMPILEDMETHOD_HPP
+
+#include "code/codeBlob.hpp"
+#include "code/pcDesc.hpp"
+#include "oops/metadata.hpp"
+
+class Dependencies;
+class ExceptionHandlerTable;
+class ImplicitExceptionTable;
+class AbstractCompiler;
+class xmlStream;
+class CompiledStaticCall;
+class NativeCallWrapper;
+
+// This class is used internally by nmethods, to cache
+// exception/pc/handler information.
+
+class ExceptionCache : public CHeapObj<mtCode> {
+ friend class VMStructs;
+ private:
+ enum { cache_size = 16 };
+ Klass* _exception_type;
+ address _pc[cache_size];
+ address _handler[cache_size];
+ volatile int _count;
+ ExceptionCache* _next;
+
+ address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
+ void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
+ address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
+ void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
+ int count() { return OrderAccess::load_acquire(&_count); }
+ // increment_count is only called under lock, but there may be concurrent readers.
+ void increment_count() { OrderAccess::release_store(&_count, _count + 1); }
+
+ public:
+
+ ExceptionCache(Handle exception, address pc, address handler);
+
+ Klass* exception_type() { return _exception_type; }
+ ExceptionCache* next() { return _next; }
+ void set_next(ExceptionCache *ec) { _next = ec; }
+
+ address match(Handle exception, address pc);
+ bool match_exception_with_space(Handle exception) ;
+ address test_address(address addr);
+ bool add_address_and_handler(address addr, address handler) ;
+};
+
+class nmethod;
+
+// cache pc descs found in earlier inquiries
+class PcDescCache VALUE_OBJ_CLASS_SPEC {
+ friend class VMStructs;
+ private:
+ enum { cache_size = 4 };
+ // The array elements MUST be volatile! Several threads may modify
+ // and read from the cache concurrently. find_pc_desc_internal has
+ // returned wrong results. C++ compiler (namely xlC12) may duplicate
+ // C++ field accesses if the elements are not volatile.
+ typedef PcDesc* PcDescPtr;
+ volatile PcDescPtr _pc_descs[cache_size]; // last cache_size pc_descs found
+ public:
+ PcDescCache() { debug_only(_pc_descs[0] = NULL); }
+ void reset_to(PcDesc* initial_pc_desc);
+ PcDesc* find_pc_desc(int pc_offset, bool approximate);
+ void add_pc_desc(PcDesc* pc_desc);
+ PcDesc* last_pc_desc() { return _pc_descs[0]; }
+};
+
+class PcDescSearch {
+private:
+ address _code_begin;
+ PcDesc* _lower;
+ PcDesc* _upper;
+public:
+ PcDescSearch(address code, PcDesc* lower, PcDesc* upper) :
+ _code_begin(code), _lower(lower), _upper(upper)
+ {
+ }
+
+ address code_begin() const { return _code_begin; }
+ PcDesc* scopes_pcs_begin() const { return _lower; }
+ PcDesc* scopes_pcs_end() const { return _upper; }
+};
+
+class PcDescContainer VALUE_OBJ_CLASS_SPEC {
+private:
+ PcDescCache _pc_desc_cache;
+public:
+ PcDescContainer() {}
+
+ PcDesc* find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search);
+ void reset_to(PcDesc* initial_pc_desc) { _pc_desc_cache.reset_to(initial_pc_desc); }
+
+ PcDesc* find_pc_desc(address pc, bool approximate, const PcDescSearch& search) {
+ address base_address = search.code_begin();
+ PcDesc* desc = _pc_desc_cache.last_pc_desc();
+ if (desc != NULL && desc->pc_offset() == pc - base_address) {
+ return desc;
+ }
+ return find_pc_desc_internal(pc, approximate, search);
+ }
+};
+
+
+class CompiledMethod : public CodeBlob {
+ friend class VMStructs;
+ friend class NMethodSweeper;
+
+ void init_defaults();
+protected:
+ enum MarkForDeoptimizationStatus {
+ not_marked,
+ deoptimize,
+ deoptimize_noupdate
+ };
+
+ MarkForDeoptimizationStatus _mark_for_deoptimization_status; // Used for stack deoptimization
+
+ bool _is_far_code; // Code is far from CodeCache.
+ // Have to use far call instructions to call it from code in CodeCache.
+ // set during construction
+ unsigned int _has_unsafe_access:1; // May fault due to unsafe access.
+ unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes?
+ unsigned int _lazy_critical_native:1; // Lazy JNI critical native
+ unsigned int _has_wide_vectors:1; // Preserve wide vectors at safepoints
+
+ Method* _method;
+ address _scopes_data_begin;
+ // All deoptee's will resume execution at this location described by
+ // this address.
+ address _deopt_handler_begin;
+ // All deoptee's at a MethodHandle call site will resume execution
+ // at this location described by this offset.
+ address _deopt_mh_handler_begin;
+
+ PcDescContainer _pc_desc_container;
+ ExceptionCache * volatile _exception_cache;
+
+ virtual void flush() = 0;
+protected:
+ CompiledMethod(Method* method, const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments);
+ CompiledMethod(Method* method, const char* name, CompilerType type, int size, int header_size, CodeBuffer* cb, int frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments);
+
+public:
+ virtual bool is_compiled() const { return true; }
+
+ bool has_unsafe_access() const { return _has_unsafe_access; }
+ void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
+
+ bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
+ void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
+
+ bool is_lazy_critical_native() const { return _lazy_critical_native; }
+ void set_lazy_critical_native(bool z) { _lazy_critical_native = z; }
+
+ bool has_wide_vectors() const { return _has_wide_vectors; }
+ void set_has_wide_vectors(bool z) { _has_wide_vectors = z; }
+
+ enum { in_use = 0, // executable nmethod
+ not_used = 1, // not entrant, but revivable
+ not_entrant = 2, // marked for deoptimization but activations may still exist,
+ // will be transformed to zombie when all activations are gone
+ zombie = 3, // no activations exist, nmethod is ready for purge
+ unloaded = 4 // there should be no activations, should not be called,
+ // will be transformed to zombie immediately
+ };
+
+ virtual bool is_in_use() const = 0;
+ virtual int comp_level() const = 0;
+ virtual int compile_id() const = 0;
+
+ virtual address verified_entry_point() const = 0;
+ virtual void log_identity(xmlStream* log) const = 0;
+ virtual void log_state_change() const = 0;
+ virtual bool make_not_used() = 0;
+ virtual bool make_not_entrant() = 0;
+ virtual bool make_entrant() = 0;
+ virtual address entry_point() const = 0;
+ virtual bool make_zombie() = 0;
+ virtual bool is_osr_method() const = 0;
+ virtual int osr_entry_bci() const = 0;
+ Method* method() const { return _method; }
+ virtual void print_pcs() = 0;
+ bool is_native_method() const { return _method != NULL && _method->is_native(); }
+ bool is_java_method() const { return _method != NULL && !_method->is_native(); }
+
+ // ScopeDesc retrieval operation
+ PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
+ // pc_desc_near returns the first PcDesc at or after the given pc.
+ PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
+
+ // ScopeDesc for an instruction
+ ScopeDesc* scope_desc_at(address pc);
+ ScopeDesc* scope_desc_near(address pc);
+
+ bool is_at_poll_return(address pc);
+ bool is_at_poll_or_poll_return(address pc);
+
+ bool is_marked_for_deoptimization() const { return _mark_for_deoptimization_status != not_marked; }
+ void mark_for_deoptimization(bool inc_recompile_counts = true) {
+ _mark_for_deoptimization_status = (inc_recompile_counts ? deoptimize : deoptimize_noupdate);
+ }
+ bool update_recompile_counts() const {
+ // Update recompile counts when either the update is explicitly requested (deoptimize)
+ // or the nmethod is not marked for deoptimization at all (not_marked).
+ // The latter happens during uncommon traps when deoptimized nmethod is made not entrant.
+ return _mark_for_deoptimization_status != deoptimize_noupdate;
+ }
+
+ // tells whether frames described by this nmethod can be deoptimized
+ // note: native wrappers cannot be deoptimized.
+ bool can_be_deoptimized() const { return is_java_method(); }
+
+ virtual oop oop_at(int index) const = 0;
+ virtual Metadata* metadata_at(int index) const = 0;
+
+ address scopes_data_begin() const { return _scopes_data_begin; }
+ virtual address scopes_data_end() const = 0;
+ int scopes_data_size() const { return scopes_data_end() - scopes_data_begin(); }
+
+ virtual PcDesc* scopes_pcs_begin() const = 0;
+ virtual PcDesc* scopes_pcs_end() const = 0;
+ int scopes_pcs_size() const { return (intptr_t) scopes_pcs_end() - (intptr_t) scopes_pcs_begin(); }
+
+ address insts_begin() const { return code_begin(); }
+ address insts_end() const { return stub_begin(); }
+ // Returns true if a given address is in the 'insts' section. The method
+ // insts_contains_inclusive() is end-inclusive.
+ bool insts_contains(address addr) const { return insts_begin() <= addr && addr < insts_end(); }
+ bool insts_contains_inclusive(address addr) const { return insts_begin() <= addr && addr <= insts_end(); }
+
+ int insts_size() const { return insts_end() - insts_begin(); }
+
+ virtual address consts_begin() const = 0;
+ virtual address consts_end() const = 0;
+ bool consts_contains(address addr) const { return consts_begin() <= addr && addr < consts_end(); }
+ int consts_size() const { return consts_end() - consts_begin(); }
+
+ virtual address stub_begin() const = 0;
+ virtual address stub_end() const = 0;
+ bool stub_contains(address addr) const { return stub_begin() <= addr && addr < stub_end(); }
+ int stub_size() const { return stub_end() - stub_begin(); }
+
+ virtual address handler_table_begin() const = 0;
+ virtual address handler_table_end() const = 0;
+ bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
+ int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
+
+ virtual address exception_begin() const = 0;
+
+ virtual address nul_chk_table_begin() const = 0;
+ virtual address nul_chk_table_end() const = 0;
+ bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
+ int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
+
+ virtual oop* oop_addr_at(int index) const = 0;
+ virtual Metadata** metadata_addr_at(int index) const = 0;
+ virtual void set_original_pc(const frame* fr, address pc) = 0;
+
+ // Exception cache support
+ // Note: _exception_cache may be read concurrently. We rely on memory_order_consume here.
+ ExceptionCache* exception_cache() const { return _exception_cache; }
+ void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
+ void release_set_exception_cache(ExceptionCache *ec) { OrderAccess::release_store_ptr(&_exception_cache, ec); }
+ address handler_for_exception_and_pc(Handle exception, address pc);
+ void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
+ void clean_exception_cache(BoolObjectClosure* is_alive);
+
+ void add_exception_cache_entry(ExceptionCache* new_entry);
+ ExceptionCache* exception_cache_entry_for_exception(Handle exception);
+
+ // MethodHandle
+ bool is_method_handle_return(address return_pc);
+ address deopt_mh_handler_begin() const { return _deopt_mh_handler_begin; }
+
+ address deopt_handler_begin() const { return _deopt_handler_begin; }
+ virtual address get_original_pc(const frame* fr) = 0;
+ // Deopt
+ // Return true is the PC is one would expect if the frame is being deopted.
+ bool is_deopt_pc (address pc) { return is_deopt_entry(pc) || is_deopt_mh_entry(pc); }
+ bool is_deopt_mh_entry(address pc) { return pc == deopt_mh_handler_begin(); }
+ bool is_deopt_entry(address pc);
+
+ virtual bool can_convert_to_zombie() = 0;
+ virtual const char* compile_kind() const = 0;
+ virtual int get_state() const = 0;
+
+ const char* state() const;
+
+ bool is_far_code() const { return _is_far_code; }
+
+ bool inlinecache_check_contains(address addr) const {
+ return (addr >= code_begin() && addr < verified_entry_point());
+ }
+
+ void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f);
+
+ // implicit exceptions support
+ virtual address continuation_for_implicit_exception(address pc) { return NULL; }
+
+ static address get_deopt_original_pc(const frame* fr);
+
+ // Inline cache support
+ void cleanup_inline_caches(bool clean_all = false);
+ virtual void clear_inline_caches();
+ void clear_ic_stubs();
+
+ // Verify and count cached icholder relocations.
+ int verify_icholder_relocations();
+ void verify_oop_relocations();
+
+ virtual bool is_evol_dependent_on(Klass* dependee) = 0;
+ // Fast breakpoint support. Tells if this compiled method is
+ // dependent on the given method. Returns true if this nmethod
+ // corresponds to the given method as well.
+ virtual bool is_dependent_on_method(Method* dependee) = 0;
+
+ virtual NativeCallWrapper* call_wrapper_at(address call) const = 0;
+ virtual NativeCallWrapper* call_wrapper_before(address return_pc) const = 0;
+ virtual address call_instruction_address(address pc) const = 0;
+
+ virtual CompiledStaticCall* compiledStaticCall_at(Relocation* call_site) const = 0;
+ virtual CompiledStaticCall* compiledStaticCall_at(address addr) const = 0;
+ virtual CompiledStaticCall* compiledStaticCall_before(address addr) const = 0;
+
+ Method* attached_method(address call_pc);
+ Method* attached_method_before_pc(address pc);
+
+ virtual void metadata_do(void f(Metadata*)) = 0;
+
+ // GC support
+
+ void set_unloading_next(CompiledMethod* next) { _unloading_next = next; }
+ CompiledMethod* unloading_next() { return _unloading_next; }
+
+ void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive);
+
+ // Check that all metadata is still alive
+ void verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive);
+
+ virtual void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
+ // The parallel versions are used by G1.
+ virtual bool do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred);
+ virtual void do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred);
+
+ static unsigned char global_unloading_clock() { return _global_unloading_clock; }
+ static void increase_unloading_clock();
+
+ void set_unloading_clock(unsigned char unloading_clock);
+ unsigned char unloading_clock();
+
+protected:
+ virtual bool do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) = 0;
+#if INCLUDE_JVMCI
+ virtual bool do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) = 0;
+#endif
+
+private:
+ // GC support to help figure out if an nmethod has been
+ // cleaned/unloaded by the current GC.
+ static unsigned char _global_unloading_clock;
+
+ volatile unsigned char _unloading_clock; // Incremented after GC unloaded/cleaned the nmethod
+
+ PcDesc* find_pc_desc(address pc, bool approximate) {
+ return _pc_desc_container.find_pc_desc(pc, approximate, PcDescSearch(code_begin(), scopes_pcs_begin(), scopes_pcs_end()));
+ }
+
+protected:
+ union {
+ // Used by G1 to chain nmethods.
+ CompiledMethod* _unloading_next;
+ // Used by non-G1 GCs to chain nmethods.
+ nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
+ };
+};
+
+#endif //SHARE_VM_CODE_COMPILEDMETHOD_HPP