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Quellcode-Bibliothek© Kompilation durch diese Firma[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]Datei: Quelle.htm.bak Sprache: C |
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/*
* Copyright (c) 1997, 2022, 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. * */ #include "precompiled.hpp" #include "asm/assembler.inline.hpp" #include "code/codeCache.hpp" #include "code/compiledIC.hpp" #include "code/compiledMethod.inline.hpp" #include "code/dependencies.hpp" #include "code/nativeInst.hpp" #include "code/nmethod.hpp" #include "code/scopeDesc.hpp" #include "compiler/abstractCompiler.hpp" #include "compiler/compilationLog.hpp" #include "compiler/compileBroker.hpp" #include "compiler/compileLog.hpp" #include "compiler/compileTask.hpp" #include "compiler/compilerDirectives.hpp" #include "compiler/directivesParser.hpp" #include "compiler/disassembler.hpp" #include "compiler/oopMap.inline.hpp" #include "gc/shared/barrierSet.hpp" #include "gc/shared/barrierSetNMethod.hpp" #include "gc/shared/collectedHeap.hpp" #include "interpreter/bytecode.hpp" #include "jvm.h" #include "logging/log.hpp" #include "logging/logStream.hpp" #include "memory/allocation.inline.hpp" #include "memory/resourceArea.hpp" #include "memory/universe.hpp" #include "oops/access.inline.hpp" #include "oops/klass.inline.hpp" #include "oops/method.inline.hpp" #include "oops/methodData.hpp" #include "oops/oop.inline.hpp" #include "oops/weakHandle.inline.hpp" #include "prims/jvmtiImpl.hpp" #include "prims/jvmtiThreadState.hpp" #include "prims/methodHandles.hpp" #include "runtime/continuation.hpp" #include "runtime/atomic.hpp" #include "runtime/deoptimization.hpp" #include "runtime/flags/flagSetting.hpp" #include "runtime/frame.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/jniHandles.inline.hpp" #include "runtime/orderAccess.hpp" #include "runtime/os.hpp" #include "runtime/safepointVerifiers.hpp" #include "runtime/serviceThread.hpp" #include "runtime/sharedRuntime.hpp" #include "runtime/signature.hpp" #include "runtime/threadWXSetters.inline.hpp" #include "runtime/vmThread.hpp" #include "utilities/align.hpp" #include "utilities/copy.hpp" #include "utilities/dtrace.hpp" #include "utilities/events.hpp" #include "utilities/globalDefinitions.hpp" #include "utilities/resourceHash.hpp" #include "utilities/xmlstream.hpp" #if INCLUDE_JVMCI #include "jvmci/jvmciRuntime.hpp" #endif #ifdef DTRACE_ENABLED // Only bother with this argument setup if dtrace is available #define DTRACE_METHOD_UNLOAD_PROBE(method) \ { \ Method* m = (method); \ if (m != NULL) { \ Symbol* klass_name = m->klass_name(); \ Symbol* name = m->name(); \ Symbol* signature = m->signature(); \ HOTSPOT_COMPILED_METHOD_UNLOAD( \ (char *) klass_name->bytes(), klass_name->utf8_length(), \ (char *) name->bytes(), name->utf8_length(), \ (char *) signature->bytes(), signature->utf8_length()); \ } \ } #else // ndef DTRACE_ENABLED #define DTRACE_METHOD_UNLOAD_PROBE(method) #endif //------------------------------------------------------------------------------ // NMethod statistics // They are printed under various flags, including: // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. // (In the latter two cases, they like other stats are printed to the log only.) #ifndef PRODUCT // These variables are put into one block to reduce relocations // and make it simpler to print from the debugger. struct java_nmethod_stats_struct { int nmethod_count; int total_size; int relocation_size; int consts_size; int insts_size; int stub_size; int scopes_data_size; int scopes_pcs_size; int dependencies_size; int handler_table_size; int nul_chk_table_size; #if INCLUDE_JVMCI int speculations_size; int jvmci_data_size; #endif int oops_size; int metadata_size; void note_nmethod(nmethod* nm) { nmethod_count += 1; total_size += nm->size(); relocation_size += nm->relocation_size(); consts_size += nm->consts_size(); insts_size += nm->insts_size(); stub_size += nm->stub_size(); oops_size += nm->oops_size(); metadata_size += nm->metadata_size(); scopes_data_size += nm->scopes_data_size(); scopes_pcs_size += nm->scopes_pcs_size(); dependencies_size += nm->dependencies_size(); handler_table_size += nm->handler_table_size(); nul_chk_table_size += nm->nul_chk_table_size(); #if INCLUDE_JVMCI speculations_size += nm->speculations_size(); jvmci_data_size += nm->jvmci_data_size(); #endif } void print_nmethod_stats(const char* name) { if (nmethod_count == 0) return; tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * s if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size) if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size) #if INCLUDE_JVMCI if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size); if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size); #endif } }; struct native_nmethod_stats_struct { int native_nmethod_count; int native_total_size; int native_relocation_size; int native_insts_size; int native_oops_size; int native_metadata_size; void note_native_nmethod(nmethod* nm) { native_nmethod_count += 1; native_total_size += nm->size(); native_relocation_size += nm->relocation_size(); native_insts_size += nm->insts_size(); native_oops_size += nm->oops_size(); native_metadata_size += nm->metadata_size(); } void print_native_nmethod_stats() { if (native_nmethod_count == 0) return; tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocati if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_s } }; struct pc_nmethod_stats_struct { int pc_desc_resets; // number of resets (= number of caches) int pc_desc_queries; // queries to nmethod::find_pc_desc int pc_desc_approx; // number of those which have approximate true int pc_desc_repeats; // number of _pc_descs[0] hits int pc_desc_hits; // number of LRU cache hits int pc_desc_tests; // total number of PcDesc examinations int pc_desc_searches; // total number of quasi-binary search steps int pc_desc_adds; // number of LUR cache insertions void print_pc_stats() { tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", pc_desc_queries, (double)(pc_desc_tests + pc_desc_searches) / pc_desc_queries); tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", pc_desc_resets, pc_desc_queries, pc_desc_approx, pc_desc_repeats, pc_desc_hits, pc_desc_tests, pc_desc_searches, pc_desc_adds); } }; #ifdef COMPILER1 static java_nmethod_stats_struct c1_java_nmethod_stats; #endif #ifdef COMPILER2 static java_nmethod_stats_struct c2_java_nmethod_stats; #endif #if INCLUDE_JVMCI static java_nmethod_stats_struct jvmci_java_nmethod_stats; #endif static java_nmethod_stats_struct unknown_java_nmethod_stats; static native_nmethod_stats_struct native_nmethod_stats; static pc_nmethod_stats_struct pc_nmethod_stats; static void note_java_nmethod(nmethod* nm) { #ifdef COMPILER1 if (nm->is_compiled_by_c1()) { c1_java_nmethod_stats.note_nmethod(nm); } else #endif #ifdef COMPILER2 if (nm->is_compiled_by_c2()) { c2_java_nmethod_stats.note_nmethod(nm); } else #endif #if INCLUDE_JVMCI if (nm->is_compiled_by_jvmci()) { jvmci_java_nmethod_stats.note_nmethod(nm); } else #endif { unknown_java_nmethod_stats.note_nmethod(nm); } } #endif // !PRODUCT //------------------------------------------------------------------------------ ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { assert(pc != NULL, "Must be non null"); assert(exception.not_null(), "Must be non null"); assert(handler != NULL, "Must be non null"); _count = 0; _exception_type = exception->klass(); _next = NULL; _purge_list_next = NULL; add_address_and_handler(pc,handler); } address ExceptionCache::match(Handle exception, address pc) { assert(pc != NULL,"Must be non null"); assert(exception.not_null(),"Must be non null"); if (exception->klass() == exception_type()) { return (test_address(pc)); } return NULL; } bool ExceptionCache::match_exception_with_space(Handle exception) { assert(exception.not_null(),"Must be non null"); if (exception->klass() == exception_type() && count() < cache_size) { return true; } return false; } address ExceptionCache::test_address(address addr) { int limit = count(); for (int i = 0; i < limit; i++) { if (pc_at(i) == addr) { return handler_at(i); } } return NULL; } bool ExceptionCache::add_address_and_handler(address addr, address handler) { if (test_address(addr) == handler) return true; int index = count(); if (index < cache_size) { set_pc_at(index, addr); set_handler_at(index, handler); increment_count(); return true; } return false; } ExceptionCache* ExceptionCache::next() { return Atomic::load(&_next); } void ExceptionCache::set_next(ExceptionCache *ec) { Atomic::store(&_next, ec); } //----------------------------------------------------------------------------- // Helper used by both find_pc_desc methods. static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); if (!approximate) return pc->pc_offset() == pc_offset; else return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); } void PcDescCache::reset_to(PcDesc* initial_pc_desc) { if (initial_pc_desc == NULL) { _pc_descs[0] = NULL; // native method; no PcDescs at all return; } NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); // reset the cache by filling it with benign (non-null) values assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); for (int i = 0; i < cache_size; i++) _pc_descs[i] = initial_pc_desc; } PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); // Note: one might think that caching the most recently // read value separately would be a win, but one would be // wrong. When many threads are updating it, the cache // line it's in would bounce between caches, negating // any benefit. // In order to prevent race conditions do not load cache elements // repeatedly, but use a local copy: PcDesc* res; // Step one: Check the most recently added value. res = _pc_descs[0]; if (res == NULL) return NULL; // native method; no PcDescs at all if (match_desc(res, pc_offset, approximate)) { NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); return res; } // Step two: Check the rest of the LRU cache. for (int i = 1; i < cache_size; ++i) { res = _pc_descs[i]; if (res->pc_offset() < 0) break; // optimization: skip empty cache if (match_desc(res, pc_offset, approximate)) { NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); return res; } } // Report failure. return NULL; } void PcDescCache::add_pc_desc(PcDesc* pc_desc) { NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); // Update the LRU cache by shifting pc_desc forward. for (int i = 0; i < cache_size; i++) { PcDesc* next = _pc_descs[i]; _pc_descs[i] = pc_desc; pc_desc = next; } } // adjust pcs_size so that it is a multiple of both oopSize and // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple // of oopSize, then 2*sizeof(PcDesc) is) static int adjust_pcs_size(int pcs_size) { int nsize = align_up(pcs_size, oopSize); if ((nsize % sizeof(PcDesc)) != 0) { nsize = pcs_size + sizeof(PcDesc); } assert((nsize % oopSize) == 0, "correct alignment"); return nsize; } int nmethod::total_size() const { return consts_size() + insts_size() + stub_size() + scopes_data_size() + scopes_pcs_size() + handler_table_size() + nul_chk_table_size(); } const char* nmethod::compile_kind() const { if (is_osr_method()) return "osr"; if (method() != NULL && is_native_method()) { if (method()->is_continuation_native_intrinsic()) { return "cnt"; } return "c2n"; } return NULL; } // Fill in default values for various flag fields void nmethod::init_defaults() { _state = not_installed; _has_flushed_dependencies = 0; _load_reported = false; // jvmti state _oops_do_mark_link = NULL; _osr_link = NULL; #if INCLUDE_RTM_OPT _rtm_state = NoRTM; #endif } #ifdef ASSERT class CheckForOopsClosure : public OopClosure { bool _found_oop = false; public: virtual void do_oop(oop* o) { _found_oop = true; } virtual void do_oop(narrowOop* o) { _found_oop = true; } bool found_oop() { return _found_oop; } }; class CheckForMetadataClosure : public MetadataClosure { bool _found_metadata = false; Metadata* _ignore = nullptr; public: CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {} virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; } bool found_metadata() { return _found_metadata; } }; static void assert_no_oops_or_metadata(nmethod* nm) { if (nm == nullptr) return; assert(nm->oop_maps() == nullptr, "expectation"); CheckForOopsClosure cfo; nm->oops_do(&cfo); assert(!cfo.found_oop(), "no oops allowed"); // We allow an exception for the own Method, but require its class to be permanent. Method* own_method = nm->method(); CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method); nm->metadata_do(&cfm); assert(!cfm.found_metadata(), "no metadata allowed"); assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_ "Method's class needs to be permanent"); } #endif nmethod* nmethod::new_native_nmethod(const methodHandle& method, int compile_id, CodeBuffer *code_buffer, int vep_offset, int frame_complete, int frame_size, ByteSize basic_lock_owner_sp_offset, ByteSize basic_lock_sp_offset, OopMapSet* oop_maps, int exception_handler) { code_buffer->finalize_oop_references(method); // create nmethod nmethod* nm = NULL; int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); CodeOffsets offsets; offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); if (exception_handler != -1) { offsets.set_value(CodeOffsets::Exceptions, exception_handler); } // MH intrinsics are dispatch stubs which are compatible with NonNMethod space. // IsUnloadingBehaviour::is_unloading needs to handle them separately. bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space(); nm = new (native_nmethod_size, allow_NonNMethod_space) nmethod(method(), compiler_none, native_nmethod_size, compile_id, &offsets, code_buffer, frame_size, basic_lock_owner_sp_offset, basic_lock_sp_offset, oop_maps); DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); ) NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); } if (nm != NULL) { // verify nmethod debug_only(nm->verify();) // might block nm->log_new_nmethod(); } return nm; } nmethod* nmethod::new_nmethod(const methodHandle& method, int compile_id, int entry_bci, CodeOffsets* offsets, int orig_pc_offset, DebugInformationRecorder* debug_info, Dependencies* dependencies, CodeBuffer* code_buffer, int frame_size, OopMapSet* oop_maps, ExceptionHandlerTable* handler_table, ImplicitExceptionTable* nul_chk_table, AbstractCompiler* compiler, CompLevel comp_level #if INCLUDE_JVMCI , char* speculations, int speculations_len, int nmethod_mirror_index, const char* nmethod_mirror_name, FailedSpeculation** failed_speculations #endif ) { assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); code_buffer->finalize_oop_references(method); // create nmethod nmethod* nm = NULL; #if INCLUDE_JVMCI int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod #endif int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) + adjust_pcs_size(debug_info->pcs_size()) + align_up((int)dependencies->size_in_bytes(), oopSize) + align_up(handler_table->size_in_bytes() , oopSize) + align_up(nul_chk_table->size_in_bytes() , oopSize) #if INCLUDE_JVMCI + align_up(speculations_len , oopSize) + align_up(jvmci_data_size , oopSize) #endif + align_up(debug_info->data_size() , oopSize); { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); nm = new (nmethod_size, comp_level) nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, oop_maps, handler_table, nul_chk_table, compiler, comp_level #if INCLUDE_JVMCI , speculations, speculations_len, jvmci_data_size #endif ); if (nm != NULL) { #if INCLUDE_JVMCI if (compiler->is_jvmci()) { // Initialize the JVMCINMethodData object inlined into nm nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, fail } #endif // To make dependency checking during class loading fast, record // the nmethod dependencies in the classes it is dependent on. // This allows the dependency checking code to simply walk the // class hierarchy above the loaded class, checking only nmethods // which are dependent on those classes. The slow way is to // check every nmethod for dependencies which makes it linear in // the number of methods compiled. For applications with a lot // classes the slow way is too slow. for (Dependencies::DepStream deps(nm); deps.next(); ) { if (deps.type() == Dependencies::call_site_target_value) { // CallSite dependencies are managed on per-CallSite instance basis. oop call_site = deps.argument_oop(0); MethodHandles::add_dependent_nmethod(call_site, nm); } else { Klass* klass = deps.context_type(); if (klass == NULL) { continue; // ignore things like evol_method } // record this nmethod as dependent on this klass InstanceKlass::cast(klass)->add_dependent_nmethod(nm); } } NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); } } // Do verification and logging outside CodeCache_lock. if (nm != NULL) { // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. DEBUG_ONLY(nm->verify();) nm->log_new_nmethod(); } return nm; } // For native wrappers nmethod::nmethod( Method* method, CompilerType type, int nmethod_size, int compile_id, CodeOffsets* offsets, CodeBuffer* code_buffer, int frame_size, ByteSize basic_lock_owner_sp_offset, ByteSize basic_lock_sp_offset, OopMapSet* oop_maps ) : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_b _unlinked_next(NULL), _native_receiver_sp_offset(basic_lock_owner_sp_offset), _native_basic_lock_sp_offset(basic_lock_sp_offset), _is_unloading_state(0) { { int scopes_data_offset = 0; int deoptimize_offset = 0; int deoptimize_mh_offset = 0; debug_only(NoSafepointVerifier nsv;) assert_locked_or_safepoint(CodeCache_lock); init_defaults(); _comp_level = CompLevel_none; _entry_bci = InvocationEntryBci; // We have no exception handler or deopt handler make the // values something that will never match a pc like the nmethod vtable entry _exception_offset = 0; _orig_pc_offset = 0; _gc_epoch = CodeCache::gc_epoch(); _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts() _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); _oops_offset = data_offset(); _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), w _scopes_pcs_offset = scopes_data_offset; _dependencies_offset = _scopes_pcs_offset; _handler_table_offset = _dependencies_offset; _nul_chk_table_offset = _handler_table_offset; #if INCLUDE_JVMCI _speculations_offset = _nul_chk_table_offset; _jvmci_data_offset = _speculations_offset; _nmethod_end_offset = _jvmci_data_offset; #else _nmethod_end_offset = _nul_chk_table_offset; #endif _compile_id = compile_id; _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); _osr_entry_point = NULL; _exception_cache = NULL; _pc_desc_container.reset_to(NULL); _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); _scopes_data_begin = (address) this + scopes_data_offset; _deopt_handler_begin = (address) this + deoptimize_offset; _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; code_buffer->copy_code_and_locs_to(this); code_buffer->copy_values_to(this); clear_unloading_state(); Universe::heap()->register_nmethod(this); debug_only(Universe::heap()->verify_nmethod(this)); CodeCache::commit(this); finalize_relocations(); } if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { ttyLocker ttyl; // keep the following output all in one block // This output goes directly to the tty, not the compiler log. // To enable tools to match it up with the compilation activity, // be sure to tag this tty output with the compile ID. if (xtty != NULL) { xtty->begin_head("print_native_nmethod"); xtty->method(_method); xtty->stamp(); xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); } // Print the header part, then print the requested information. // This is both handled in decode2(), called via print_code() -> decode() if (PrintNativeNMethods) { tty->print_cr("-------------------------- Assembly (native nmethod) ------------- print_code(); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #if defined(SUPPORT_DATA_STRUCTS) if (AbstractDisassembler::show_structs()) { if (oop_maps != NULL) { tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning oop_maps->print_on(tty); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - } } #endif } else { print(); // print the header part only. } #if defined(SUPPORT_DATA_STRUCTS) if (AbstractDisassembler::show_structs()) { if (PrintRelocations) { print_relocations(); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - } } #endif if (xtty != NULL) { xtty->tail("print_native_nmethod"); } } } void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level) } void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) // Try MethodNonProfiled and MethodProfiled. void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfil if (return_value != nullptr || !allow_NonNMethod_space) return return_value; // Try NonNMethod or give up. return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod); } nmethod::nmethod( Method* method, CompilerType type, int nmethod_size, int compile_id, int entry_bci, CodeOffsets* offsets, int orig_pc_offset, DebugInformationRecorder* debug_info, Dependencies* dependencies, CodeBuffer *code_buffer, int frame_size, OopMapSet* oop_maps, ExceptionHandlerTable* handler_table, ImplicitExceptionTable* nul_chk_table, AbstractCompiler* compiler, CompLevel comp_level #if INCLUDE_JVMCI , char* speculations, int speculations_len, int jvmci_data_size #endif ) : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, o _unlinked_next(NULL), _native_receiver_sp_offset(in_ByteSize(-1)), _native_basic_lock_sp_offset(in_ByteSize(-1)), _is_unloading_state(0) { assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); { debug_only(NoSafepointVerifier nsv;) assert_locked_or_safepoint(CodeCache_lock); _deopt_handler_begin = (address) this; _deopt_mh_handler_begin = (address) this; init_defaults(); _entry_bci = entry_bci; _compile_id = compile_id; _comp_level = comp_level; _orig_pc_offset = orig_pc_offset; _gc_epoch = CodeCache::gc_epoch(); // Section offsets _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts() _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); set_ctable_begin(header_begin() + _consts_offset); #if INCLUDE_JVMCI if (compiler->is_jvmci()) { // JVMCI might not produce any stub sections if (offsets->value(CodeOffsets::Exceptions) != -1) { _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); } else { _exception_offset = -1; } if (offsets->value(CodeOffsets::Deopt) != -1) { _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deop } else { _deopt_handler_begin = NULL; } if (offsets->value(CodeOffsets::DeoptMH) != -1) { _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::D } else { _deopt_mh_handler_begin = NULL; } } else #endif { // Exception handler and deopt handler are in the stub section assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt if (offsets->value(CodeOffsets::DeoptMH) != -1) { _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::De } else { _deopt_mh_handler_begin = NULL; } } if (offsets->value(CodeOffsets::UnwindHandler) != -1) { _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); } else { _unwind_handler_offset = -1; } _oops_offset = data_offset(); _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size( _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_by _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes #if INCLUDE_JVMCI _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes( _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize); _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize); #else _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes() #endif _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); _exception_cache = NULL; _scopes_data_begin = (address) this + scopes_data_offset; _pc_desc_container.reset_to(scopes_pcs_begin()); code_buffer->copy_code_and_locs_to(this); // Copy contents of ScopeDescRecorder to nmethod code_buffer->copy_values_to(this); debug_info->copy_to(this); dependencies->copy_to(this); clear_unloading_state(); Universe::heap()->register_nmethod(this); debug_only(Universe::heap()->verify_nmethod(this)); CodeCache::commit(this); finalize_relocations(); // Copy contents of ExceptionHandlerTable to nmethod handler_table->copy_to(this); nul_chk_table->copy_to(this); #if INCLUDE_JVMCI // Copy speculations to nmethod if (speculations_size() != 0) { memcpy(speculations_begin(), speculations, speculations_len); } #endif // we use the information of entry points to find out if a method is // static or non static assert(compiler->is_c2() || compiler->is_jvmci() || _method->is_static() == (entry_point() == _verified_entry_point), " entry points must be same for static methods and vice versa"); } } // Print a short set of xml attributes to identify this nmethod. The // output should be embedded in some other element. void nmethod::log_identity(xmlStream* log) const { log->print(" compile_id='%d'", compile_id()); const char* nm_kind = compile_kind(); if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); log->print(" compiler='%s'", compiler_name()); if (TieredCompilation) { log->print(" level='%d'", comp_level()); } #if INCLUDE_JVMCI if (jvmci_nmethod_data() != NULL) { const char* jvmci_name = jvmci_nmethod_data()->name(); if (jvmci_name != NULL) { log->print(" jvmci_mirror_name='"); log->text("%s", jvmci_name); log->print("'"); } } #endif } #define LOG_OFFSET(log, name) \ if (p2i(name##_end()) - p2i(name##_begin())) \ log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ p2i(name##_begin()) - p2i(this)) void nmethod::log_new_nmethod() const { if (LogCompilation && xtty != NULL) { ttyLocker ttyl; xtty->begin_elem("nmethod"); log_identity(xtty); xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); LOG_OFFSET(xtty, relocation); LOG_OFFSET(xtty, consts); LOG_OFFSET(xtty, insts); LOG_OFFSET(xtty, stub); LOG_OFFSET(xtty, scopes_data); LOG_OFFSET(xtty, scopes_pcs); LOG_OFFSET(xtty, dependencies); LOG_OFFSET(xtty, handler_table); LOG_OFFSET(xtty, nul_chk_table); LOG_OFFSET(xtty, oops); LOG_OFFSET(xtty, metadata); xtty->method(method()); xtty->stamp(); xtty->end_elem(); } } #undef LOG_OFFSET // Print out more verbose output usually for a newly created nmethod. void nmethod::print_on(outputStream* st, const char* msg) const { if (st != NULL) { ttyLocker ttyl; if (WizardMode) { CompileTask::print(st, this, msg, /*short_form:*/ true); st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); } else { CompileTask::print(st, this, msg, /*short_form:*/ false); } } } void nmethod::maybe_print_nmethod(const DirectiveSet* directive) { bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExce print_nmethod(printnmethods); } } void nmethod::print_nmethod(bool printmethod) { ttyLocker ttyl; // keep the following output all in one block if (xtty != NULL) { xtty->begin_head("print_nmethod"); log_identity(xtty); xtty->stamp(); xtty->end_head(); } // Print the header part, then print the requested information. // This is both handled in decode2(). if (printmethod) { ResourceMark m; if (is_compiled_by_c1()) { tty->cr(); tty->print_cr("============================= C1-compiled nmethod ================ } if (is_compiled_by_jvmci()) { tty->cr(); tty->print_cr("=========================== JVMCI-compiled nmethod =============== } tty->print_cr("----------------------------------- Assembly --------------------- decode2(tty); #if defined(SUPPORT_DATA_STRUCTS) if (AbstractDisassembler::show_structs()) { // Print the oops from the underlying CodeBlob as well. tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - print_oops(tty); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - print_metadata(tty); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - print_pcs(); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - if (oop_maps() != NULL) { tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning oop_maps()->print_on(tty); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - } } #endif } else { print(); // print the header part only. } #if defined(SUPPORT_DATA_STRUCTS) if (AbstractDisassembler::show_structs()) { methodHandle mh(Thread::current(), _method); if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommand::Pr print_scopes(); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - } if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommand:: print_relocations(); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - } if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommand: print_dependencies(); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - } if (printmethod || PrintExceptionHandlers) { print_handler_table(); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - print_nul_chk_table(); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - } if (printmethod) { print_recorded_oops(); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - print_recorded_metadata(); tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - } } #endif if (xtty != NULL) { xtty->tail("print_nmethod"); } } // Promote one word from an assembly-time handle to a live embedded oop. inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { if (handle == NULL || // As a special case, IC oops are initialized to 1 or -1. handle == (jobject) Universe::non_oop_word()) { *(void**)dest = handle; } else { *dest = JNIHandles::resolve_non_null(handle); } } // Have to have the same name because it's called by a template void nmethod::copy_values(GrowableArray<jobject>* array) { int length = array->length(); assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); oop* dest = oops_begin(); for (int index = 0 ; index < length; index++) { initialize_immediate_oop(&dest[index], array->at(index)); } // Now we can fix up all the oops in the code. We need to do this // in the code because the assembler uses jobjects as placeholders. // The code and relocations have already been initialized by the // CodeBlob constructor, so it is valid even at this early point to // iterate over relocations and patch the code. fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); } void nmethod::copy_values(GrowableArray<Metadata*>* array) { int length = array->length(); assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); Metadata** dest = metadata_begin(); for (int index = 0 ; index < length; index++) { dest[index] = array->at(index); } } void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediat // re-patch all oop-bearing instructions, just in case some oops moved RelocIterator iter(this, begin, end); while (iter.next()) { if (iter.type() == relocInfo::oop_type) { oop_Relocation* reloc = iter.oop_reloc(); if (initialize_immediates && reloc->oop_is_immediate()) { oop* dest = reloc->oop_addr(); initialize_immediate_oop(dest, cast_from_oop<jobject>(*dest)); } // Refresh the oop-related bits of this instruction. reloc->fix_oop_relocation(); } else if (iter.type() == relocInfo::metadata_type) { metadata_Relocation* reloc = iter.metadata_reloc(); reloc->fix_metadata_relocation(); } } } static void install_post_call_nop_displacement(nmethod* nm, address pc) { NativePostCallNop* nop = nativePostCallNop_at((address) pc); intptr_t cbaddr = (intptr_t) nm; intptr_t offset = ((intptr_t) pc) - cbaddr; int oopmap_slot = nm->oop_maps()->find_slot_for_offset((intptr_t) pc - (intptr_t) nm->code if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", } else if (((oopmap_slot & 0xff) == oopmap_slot) && ((offset & 0xffffff) == offset)) { jint value = (oopmap_slot << 24) | (jint) offset; nop->patch(value); } else { log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset); } } void nmethod::finalize_relocations() { NoSafepointVerifier nsv; // Make sure that post call nops fill in nmethod offsets eagerly so // we don't have to race with deoptimization RelocIterator iter(this); while (iter.next()) { if (iter.type() == relocInfo::post_call_nop_type) { post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc(); address pc = reloc->addr(); install_post_call_nop_displacement(this, pc); } } } void nmethod::make_deoptimized() { if (!Continuations::enabled()) { return; } assert(method() == NULL || can_be_deoptimized(), ""); CompiledICLocker ml(this); assert(CompiledICLocker::is_safe(this), "mt unsafe call"); ResourceMark rm; RelocIterator iter(this, oops_reloc_begin()); while (iter.next()) { switch (iter.type()) { case relocInfo::virtual_call_type: case relocInfo::opt_virtual_call_type: { CompiledIC *ic = CompiledIC_at(&iter); address pc = ic->end_of_call(); NativePostCallNop* nop = nativePostCallNop_at(pc); if (nop != NULL) { nop->make_deopt(); } assert(NativeDeoptInstruction::is_deopt_at(pc), "check"); break; } case relocInfo::static_call_type: { CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); address pc = csc->end_of_call(); NativePostCallNop* nop = nativePostCallNop_at(pc); //tty->print_cr(" - static pc %p", pc); if (nop != NULL) { nop->make_deopt(); } // We can't assert here, there are some calls to stubs / runtime // that have reloc data and doesn't have a post call NOP. //assert(NativeDeoptInstruction::is_deopt_at(pc), "check"); break; } default: break; } } // Don't deopt this again. mark_deoptimized(); } void nmethod::verify_clean_inline_caches() { assert(CompiledICLocker::is_safe(this), "mt unsafe call"); ResourceMark rm; RelocIterator iter(this, oops_reloc_begin()); while(iter.next()) { switch(iter.type()) { case relocInfo::virtual_call_type: case relocInfo::opt_virtual_call_type: { CompiledIC *ic = CompiledIC_at(&iter); CodeBlob *cb = CodeCache::find_blob(ic->ic_destination()); assert(cb != NULL, "destination not in CodeBlob?"); nmethod* nm = cb->as_nmethod_or_null(); if( nm != NULL ) { // Verify that inline caches pointing to bad nmethods are clean if (!nm->is_in_use() || (nm->method()->code() != nm)) { assert(ic->is_clean(), "IC should be clean"); } } break; } case relocInfo::static_call_type: { CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); CodeBlob *cb = CodeCache::find_blob(csc->destination()); assert(cb != NULL, "destination not in CodeBlob?"); nmethod* nm = cb->as_nmethod_or_null(); if( nm != NULL ) { // Verify that inline caches pointing to bad nmethods are clean if (!nm->is_in_use() || (nm->method()->code() != nm)) { assert(csc->is_clean(), "IC should be clean"); } } break; } default: break; } } } void nmethod::mark_as_maybe_on_stack() { Atomic::store(&_gc_epoch, CodeCache::gc_epoch()); } bool nmethod::is_maybe_on_stack() { // If the condition below is true, it means that the nmethod was found to // be alive the previous completed marking cycle. return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle(); } void nmethod::inc_decompile_count() { if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; // Could be gated by ProfileTraps, but do not bother... Method* m = method(); if (m == NULL) return; MethodData* mdo = m->method_data(); if (mdo == NULL) return; // There is a benign race here. See comments in methodData.hpp. mdo->inc_decompile_count(); } bool nmethod::try_transition(int new_state_int) { signed char new_state = new_state_int; assert_lock_strong(CompiledMethod_lock); signed char old_state = _state; if (old_state >= new_state) { // Ensure monotonicity of transitions. return false; } Atomic::store(&_state, new_state); return true; } void nmethod::invalidate_osr_method() { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); // Remove from list of active nmethods if (method() != NULL) { method()->method_holder()->remove_osr_nmethod(this); } } void nmethod::log_state_change() const { if (LogCompilation) { if (xtty != NULL) { ttyLocker ttyl; // keep the following output all in one block xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'", os::current_thread_id()); log_identity(xtty); xtty->stamp(); xtty->end_elem(); } } CompileTask::print_ul(this, "made not entrant"); if (PrintCompilation) { print_on(tty, "made not entrant"); } } void nmethod::unlink_from_method() { if (method() != NULL) { method()->unlink_code(this); } } // Invalidate code bool nmethod::make_not_entrant() { // This can be called while the system is already at a safepoint which is ok NoSafepointVerifier nsv; if (is_unloading()) { // If the nmethod is unloading, then it is already not entrant through // the nmethod entry barriers. No need to do anything; GC will unload it. return false; } if (Atomic::load(&_state) == not_entrant) { // Avoid taking the lock if already in required state. // This is safe from races because the state is an end-state, // which the nmethod cannot back out of once entered. // No need for fencing either. return false; } { // Enter critical section. Does not block for safepoint. MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex if (Atomic::load(&_state) == not_entrant) { // another thread already performed this transition so nothing // to do, but return false to indicate this. return false; } if (is_osr_method()) { // This logic is equivalent to the logic below for patching the // verified entry point of regular methods. // this effectively makes the osr nmethod not entrant invalidate_osr_method(); } else { // The caller can be calling the method statically or through an inline // cache call. NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), SharedRuntime::get_handle_wrong_method_stub()); } if (update_recompile_counts()) { // Mark the method as decompiled. inc_decompile_count(); } BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) { // If nmethod entry barriers are not supported, we won't mark // nmethods as on-stack when they become on-stack. So we // degrade to a less accurate flushing strategy, for now. mark_as_maybe_on_stack(); } // Change state bool success = try_transition(not_entrant); assert(success, "Transition can't fail"); // Log the transition once log_state_change(); // Remove nmethod from method. unlink_from_method(); } // leave critical region under CompiledMethod_lock #if INCLUDE_JVMCI // Invalidate can't occur while holding the Patching lock JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); if (nmethod_data != NULL) { nmethod_data->invalidate_nmethod_mirror(this); } #endif #ifdef ASSERT if (is_osr_method() && method() != NULL) { // Make sure osr nmethod is invalidated, i.e. not on the list bool found = method()->method_holder()->remove_osr_nmethod(this); assert(!found, "osr nmethod should have been invalidated"); } #endif return true; } // For concurrent GCs, there must be a handshake between unlink and flush void nmethod::unlink() { if (_unlinked_next != NULL) { // Already unlinked. It can be invoked twice because concurrent code cache // unloading might need to restart when inline cache cleaning fails due to // running out of ICStubs, which can only be refilled at safepoints return; } flush_dependencies(); // unlink_from_method will take the CompiledMethod_lock. // In this case we don't strictly need it when unlinking nmethods from // the Method, because it is only concurrently unlinked by // the entry barrier, which acquires the per nmethod lock. unlink_from_method(); clear_ic_callsites(); if (is_osr_method()) { invalidate_osr_method(); } #if INCLUDE_JVMCI // Clear the link between this nmethod and a HotSpotNmethod mirror JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); if (nmethod_data != NULL) { nmethod_data->invalidate_nmethod_mirror(this); } #endif // Post before flushing as jmethodID is being used post_compiled_method_unload(); // Register for flushing when it is safe. For concurrent class unloading, // that would be after the unloading handshake, and for STW class unloading // that would be when getting back to the VM thread. CodeCache::register_unlinked(this); } void nmethod::flush() { MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag); // completely deallocate this method Events::log(Thread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); log_debug(codecache)("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT "/Free CodeCache:" SIZE_FORMAT "Kb", is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); // We need to deallocate any ExceptionCache data. // Note that we do not need to grab the nmethod lock for this, it // better be thread safe if we're disposing of it! ExceptionCache* ec = exception_cache(); while(ec != NULL) { ExceptionCache* next = ec->next(); delete ec; ec = next; } Universe::heap()->unregister_nmethod(this); CodeCache::unregister_old_nmethod(this); CodeBlob::flush(); CodeCache::free(this); } oop nmethod::oop_at(int index) const { if (index == 0) { return NULL; } return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index)); } oop nmethod::oop_at_phantom(int index) const { if (index == 0) { return NULL; } return NativeAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index)); } // // Notify all classes this nmethod is dependent on that it is no // longer dependent. void nmethod::flush_dependencies() { if (!has_flushed_dependencies()) { set_has_flushed_dependencies(); for (Dependencies::DepStream deps(this); deps.next(); ) { if (deps.type() == Dependencies::call_site_target_value) { // CallSite dependencies are managed on per-CallSite instance basis. oop call_site = deps.argument_oop(0); MethodHandles::clean_dependency_context(call_site); } else { Klass* klass = deps.context_type(); if (klass == NULL) { continue; // ignore things like evol_method } // During GC liveness of dependee determines class that needs to be updated. // The GC may clean dependency contexts concurrently and in parallel. InstanceKlass::cast(klass)->clean_dependency_context(); } } } } void nmethod::post_compiled_method(CompileTask* task) { task->mark_success(); task->set_nm_content_size(content_size()); task->set_nm_insts_size(insts_size()); task->set_nm_total_size(total_size()); // JVMTI -- compiled method notification (must be done outside lock) post_compiled_method_load_event(); if (CompilationLog::log() != NULL) { CompilationLog::log()->log_nmethod(JavaThread::current(), this); } const DirectiveSet* directive = task->directive(); maybe_print_nmethod(directive); } // ------------------------------------------------------------------ // post_compiled_method_load_event // new method for install_code() path // Transfer information from compilation to jvmti void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) { // This is a bad time for a safepoint. We don't want // this nmethod to get unloaded while we're queueing the event. NoSafepointVerifier nsv; Method* m = method(); HOTSPOT_COMPILED_METHOD_LOAD( (char *) m->klass_name()->bytes(), m->klass_name()->utf8_length(), (char *) m->name()->bytes(), m->name()->utf8_length(), (char *) m->signature()->bytes(), m->signature()->utf8_length(), insts_begin(), insts_size()); if (JvmtiExport::should_post_compiled_method_load()) { // Only post unload events if load events are found. set_load_reported(); // If a JavaThread hasn't been passed in, let the Service thread // (which is a real Java thread) post the event JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this); if (state == NULL) { // Execute any barrier code for this nmethod as if it's called, since // keeping it alive looks like stack walking. run_nmethod_entry_barrier(); ServiceThread::enqueue_deferred_event(&event); } else { // This enters the nmethod barrier outside in the caller. state->enqueue_event(&event); } } } void nmethod::post_compiled_method_unload() { assert(_method != NULL, "just checking"); DTRACE_METHOD_UNLOAD_PROBE(method()); // If a JVMTI agent has enabled the CompiledMethodUnload event then // post the event. The Method* will not be valid when this is freed. // Don't bother posting the unload if the load event wasn't posted. if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) { JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_unload_event( method()->jmethod_id(), insts_begin()); ServiceThread::enqueue_deferred_event(&event); } } // Iterate over metadata calling this function. Used by RedefineClasses void nmethod::metadata_do(MetadataClosure* f) { { // Visit all immediate references that are embedded in the instruction stream. RelocIterator iter(this, oops_reloc_begin()); while (iter.next()) { if (iter.type() == relocInfo::metadata_type) { metadata_Relocation* r = iter.metadata_reloc(); // In this metadata, we must only follow those metadatas directly embedded in // the code. Other metadatas (oop_index>0) are seen as part of // the metadata section below. assert(1 == (r->metadata_is_immediate()) + (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), "metadata must be found in exactly one place"); if (r->metadata_is_immediate() && r->metadata_value() != NULL) { Metadata* md = r->metadata_value(); if (md != _method) f->do_metadata(md); } } else if (iter.type() == relocInfo::virtual_call_type) { // Check compiledIC holders associated with this nmethod ResourceMark rm; CompiledIC *ic = CompiledIC_at(&iter); if (ic->is_icholder_call()) { CompiledICHolder* cichk = ic->cached_icholder(); f->do_metadata(cichk->holder_metadata()); f->do_metadata(cichk->holder_klass()); } else { Metadata* ic_oop = ic->cached_metadata(); if (ic_oop != NULL) { f->do_metadata(ic_oop); } } } } } // Visit the metadata section for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops Metadata* md = *p; f->do_metadata(md); } // Visit metadata not embedded in the other places. if (_method != NULL) f->do_metadata(_method); } // Heuristic for nuking nmethods even though their oops are live. // Main purpose is to reduce code cache pressure and get rid of // nmethods that don't seem to be all that relevant any longer. bool nmethod::is_cold() { if (!MethodFlushing || is_native_method() || is_not_installed()) { // No heuristic unloading at all return false; } if (!is_maybe_on_stack() && is_not_entrant()) { // Not entrant nmethods that are not on any stack can just // be removed return true; } BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) { // On platforms that don't support nmethod entry barriers, we can't // trust the temporal aspect of the gc epochs. So we can't detect // cold nmethods on such platforms. return false; } if (!UseCodeCacheFlushing) { // Bail out if we don't heuristically remove nmethods return false; } // Other code can be phased out more gradually after N GCs return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::col } // The _is_unloading_state encodes a tuple comprising the unloading cycle // and the result of IsUnloadingBehaviour::is_unloading() for that cycle. // This is the bit layout of the _is_unloading_state byte: 00000CCU // CC refers to the cycle, which has 2 bits, and U refers to the result of // IsUnloadingBehaviour::is_unloading() for that unloading cycle. class IsUnloadingState: public AllStatic { static const uint8_t _is_unloading_mask = 1; static const uint8_t _is_unloading_shift = 0; static const uint8_t _unloading_cycle_mask = 6; static const uint8_t _unloading_cycle_shift = 1; static uint8_t set_is_unloading(uint8_t state, bool value) { state &= ~_is_unloading_mask; if (value) { state |= 1 << _is_unloading_shift; } assert(is_unloading(state) == value, "unexpected unloading cycle overflow"); return state; } static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) { state &= ~_unloading_cycle_mask; state |= value << _unloading_cycle_shift; assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow"); return state; } public: static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unl static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mas static uint8_t create(bool is_unloading, uint8_t unloading_cycle) { uint8_t state = 0; state = set_is_unloading(state, is_unloading); state = set_unloading_cycle(state, unloading_cycle); return state; } }; bool nmethod::is_unloading() { uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state); bool state_is_unloading = IsUnloadingState::is_unloading(state); if (state_is_unloading) { return true; } uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state); uint8_t current_cycle = CodeCache::unloading_cycle(); if (state_unloading_cycle == current_cycle) { return false; } // The IsUnloadingBehaviour is responsible for calculating if the nmethod // should be unloaded. This can be either because there is a dead oop, // or because is_cold() heuristically determines it is time to unload. state_unloading_cycle = current_cycle; state_is_unloading = IsUnloadingBehaviour::is_unloading(this); uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cyc // Note that if an nmethod has dead oops, everyone will agree that the // nmethod is_unloading. However, the is_cold heuristics can yield // different outcomes, so we guard the computed result with a CAS // to ensure all threads have a shared view of whether an nmethod // is_unloading or not. uint8_t found_state = Atomic::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed); if (found_state == state) { // First to change state, we win return state_is_unloading; } else { // State already set, so use it return IsUnloadingState::is_unloading(found_state); } } void nmethod::clear_unloading_state() { uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle()); RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); } // This is called at the end of the strong tracing/marking phase of a // GC to unload an nmethod if it contains otherwise unreachable // oops or is heuristically found to be not important. void nmethod::do_unloading(bool unloading_occurred) { // Make sure the oop's ready to receive visitors if (is_unloading()) { unlink(); } else { guarantee(unload_nmethod_caches(unloading_occurred), "Should not need transition stubs"); BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); if (bs_nm != NULL) { bs_nm->disarm(this); } } } void nmethod::oops_do(OopClosure* f, bool allow_dead) { // Prevent extra code cache walk for platforms that don't have immediate oops. if (relocInfo::mustIterateImmediateOopsInCode()) { RelocIterator iter(this, oops_reloc_begin()); while (iter.next()) { if (iter.type() == relocInfo::oop_type ) { oop_Relocation* r = iter.oop_reloc(); // In this loop, we must only follow those oops directly embedded in // the code. Other oops (oop_index>0) are seen as part of scopes_oops. assert(1 == (r->oop_is_immediate()) + (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), "oop must be found in exactly one place"); if (r->oop_is_immediate() && r->oop_value() != NULL) { f->do_oop(r->oop_addr()); } } } } // Scopes // This includes oop constants not inlined in the code stream. for (oop* p = oops_begin(); p < oops_end(); p++) { if (*p == Universe::non_oop_word()) continue; // skip non-oops f->do_oop(p); } } void nmethod::follow_nmethod(OopIterateClosure* cl) { // Process oops in the nmethod oops_do(cl); // CodeCache unloading support mark_as_maybe_on_stack(); BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); bs_nm->disarm(this); // There's an assumption made that this function is not used by GCs that // relocate objects, and therefore we don't call fix_oop_relocations. } nmethod* volatile nmethod::_oops_do_mark_nmethods; void nmethod::oops_do_log_change(const char* state) { LogTarget(Trace, gc, nmethod) lt; if (lt.is_enabled()) { LogStream ls(lt); CompileTask::print(&ls, this, state, true /* short_form */); } } bool nmethod::oops_do_try_claim() { if (oops_do_try_claim_weak_request()) { nmethod* result = oops_do_try_add_to_list_as_weak_done(); assert(result == NULL, "adding to global list as weak done must always succeed."); return true; } return false; } bool nmethod::oops_do_try_claim_weak_request() { assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); --> -------------------- --> maximum size reached --> -------------------- ¤ Dauer der Verarbeitung: 0.151 Sekunden (vorverarbeitet) ¤ |
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