| /* |
| * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "code/codeCache.hpp" |
| #include "code/compiledIC.hpp" |
| #include "code/dependencies.hpp" |
| #include "code/nativeInst.hpp" |
| #include "code/nmethod.hpp" |
| #include "code/scopeDesc.hpp" |
| #include "compiler/abstractCompiler.hpp" |
| #include "compiler/compileBroker.hpp" |
| #include "compiler/compileLog.hpp" |
| #include "compiler/compilerDirectives.hpp" |
| #include "compiler/directivesParser.hpp" |
| #include "compiler/disassembler.hpp" |
| #include "interpreter/bytecode.hpp" |
| #include "logging/log.hpp" |
| #include "logging/logStream.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/methodData.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "prims/jvm.h" |
| #include "prims/jvmtiImpl.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/orderAccess.inline.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "runtime/sweeper.hpp" |
| #include "utilities/align.hpp" |
| #include "utilities/dtrace.hpp" |
| #include "utilities/events.hpp" |
| #include "utilities/resourceHash.hpp" |
| #include "utilities/xmlstream.hpp" |
| #ifdef SHARK |
| #include "shark/sharkCompiler.hpp" |
| #endif |
| #if INCLUDE_JVMCI |
| #include "jvmci/jvmciJavaClasses.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; |
| 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(); |
| } |
| 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 * sizeof(nmethod)); |
| 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); |
| } |
| }; |
| |
| 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_relocation_size); |
| 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_size); |
| } |
| }; |
| |
| 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 |
| #ifdef SHARK |
| static java_nmethod_stats_struct shark_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 |
| #ifdef SHARK |
| if (nm->is_compiled_by_shark()) { |
| shark_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; |
| |
| 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; |
| } |
| |
| //----------------------------------------------------------------------------- |
| |
| |
| // 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()) return "c2n"; |
| return NULL; |
| } |
| |
| // Fill in default values for various flag fields |
| void nmethod::init_defaults() { |
| _state = in_use; |
| _has_flushed_dependencies = 0; |
| _lock_count = 0; |
| _stack_traversal_mark = 0; |
| _unload_reported = false; // jvmti state |
| _is_far_code = false; // nmethods are located in CodeCache |
| |
| #ifdef ASSERT |
| _oops_are_stale = false; |
| #endif |
| |
| _oops_do_mark_link = NULL; |
| _jmethod_id = NULL; |
| _osr_link = NULL; |
| if (UseG1GC) { |
| _unloading_next = NULL; |
| } else { |
| _scavenge_root_link = NULL; |
| } |
| _scavenge_root_state = 0; |
| #if INCLUDE_RTM_OPT |
| _rtm_state = NoRTM; |
| #endif |
| #if INCLUDE_JVMCI |
| _jvmci_installed_code = NULL; |
| _speculation_log = NULL; |
| #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) { |
| code_buffer->finalize_oop_references(method); |
| // create nmethod |
| nmethod* nm = NULL; |
| { |
| MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
| int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); |
| CodeOffsets offsets; |
| offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); |
| offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); |
| nm = new (native_nmethod_size, CompLevel_none) 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); |
| NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); |
| } |
| // verify nmethod |
| debug_only(if (nm) nm->verify();) // might block |
| |
| if (nm != NULL) { |
| 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, |
| int comp_level |
| #if INCLUDE_JVMCI |
| , Handle installed_code, |
| Handle speculationLog |
| #endif |
| ) |
| { |
| assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); |
| code_buffer->finalize_oop_references(method); |
| // create nmethod |
| nmethod* nm = NULL; |
| { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
| 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) |
| + align_up(debug_info->data_size() , oopSize); |
| |
| 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 |
| , installed_code, |
| speculationLog |
| #endif |
| ); |
| |
| if (nm != NULL) { |
| // 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_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), |
| _native_receiver_sp_offset(basic_lock_owner_sp_offset), |
| _native_basic_lock_sp_offset(basic_lock_sp_offset) |
| { |
| { |
| 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(); |
| _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; |
| |
| _consts_offset = data_offset(); |
| _stub_offset = data_offset(); |
| _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(), wordSize); |
| _scopes_pcs_offset = scopes_data_offset; |
| _dependencies_offset = _scopes_pcs_offset; |
| _handler_table_offset = _dependencies_offset; |
| _nul_chk_table_offset = _handler_table_offset; |
| _nmethod_end_offset = _nul_chk_table_offset; |
| _compile_id = compile_id; |
| _comp_level = CompLevel_none; |
| _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); |
| _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); |
| |
| _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); |
| if (ScavengeRootsInCode) { |
| if (detect_scavenge_root_oops()) { |
| CodeCache::add_scavenge_root_nmethod(this); |
| } |
| Universe::heap()->register_nmethod(this); |
| } |
| debug_only(verify_scavenge_root_oops()); |
| CodeCache::commit(this); |
| } |
| |
| 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 first |
| print(); |
| // then print the requested information |
| if (PrintNativeNMethods) { |
| print_code(); |
| if (oop_maps != NULL) { |
| oop_maps->print(); |
| } |
| } |
| if (PrintRelocations) { |
| print_relocations(); |
| } |
| 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)); |
| } |
| |
| 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, |
| int comp_level |
| #if INCLUDE_JVMCI |
| , Handle installed_code, |
| Handle speculation_log |
| #endif |
| ) |
| : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), |
| _native_receiver_sp_offset(in_ByteSize(-1)), |
| _native_basic_lock_sp_offset(in_ByteSize(-1)) |
| { |
| 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; |
| _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); |
| |
| // 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 |
| _jvmci_installed_code = installed_code(); |
| _speculation_log = (instanceOop)speculation_log(); |
| |
| 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::Deopt); |
| } else { |
| _deopt_handler_begin = NULL; |
| } |
| if (offsets->value(CodeOffsets::DeoptMH) != -1) { |
| _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); |
| } 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::DeoptMH); |
| } else { |
| _deopt_mh_handler_begin = NULL; |
| #if INCLUDE_JVMCI |
| } |
| #endif |
| } |
| 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(), wordSize); |
| |
| _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_bytes (), oopSize); |
| _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); |
| _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); |
| _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); |
| if (ScavengeRootsInCode) { |
| if (detect_scavenge_root_oops()) { |
| CodeCache::add_scavenge_root_nmethod(this); |
| } |
| Universe::heap()->register_nmethod(this); |
| } |
| debug_only(verify_scavenge_root_oops()); |
| |
| CodeCache::commit(this); |
| |
| // Copy contents of ExceptionHandlerTable to nmethod |
| handler_table->copy_to(this); |
| nul_chk_table->copy_to(this); |
| |
| // 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()); |
| } |
| } |
| |
| |
| #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; |
| HandleMark hm; |
| 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(DirectiveSet* directive) { |
| bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; |
| if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { |
| 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"); |
| xtty->stamp(); |
| xtty->end_head(); |
| } |
| // print the header part first |
| print(); |
| // then print the requested information |
| if (printmethod) { |
| print_code(); |
| print_pcs(); |
| if (oop_maps()) { |
| oop_maps()->print(); |
| } |
| } |
| if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { |
| print_scopes(); |
| } |
| if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { |
| print_relocations(); |
| } |
| if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { |
| print_dependencies(); |
| } |
| if (printmethod || PrintExceptionHandlers) { |
| print_handler_table(); |
| print_nul_chk_table(); |
| } |
| if (printmethod) { |
| print_recorded_oops(); |
| print_recorded_metadata(); |
| } |
| 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()) { |
| (*dest) = (oop) 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_immediates) { |
| // 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, (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(); |
| } |
| } |
| } |
| |
| |
| void nmethod::verify_clean_inline_caches() { |
| assert_locked_or_safepoint(CompiledIC_lock); |
| |
| // If the method is not entrant or zombie then a JMP is plastered over the |
| // first few bytes. If an oop in the old code was there, that oop |
| // should not get GC'd. Skip the first few bytes of oops on |
| // not-entrant methods. |
| address low_boundary = verified_entry_point(); |
| if (!is_in_use()) { |
| low_boundary += NativeJump::instruction_size; |
| // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. |
| // This means that the low_boundary is going to be a little too high. |
| // This shouldn't matter, since oops of non-entrant methods are never used. |
| // In fact, why are we bothering to look at oops in a non-entrant method?? |
| } |
| |
| ResourceMark rm; |
| RelocIterator iter(this, low_boundary); |
| while(iter.next()) { |
| switch(iter.type()) { |
| case relocInfo::virtual_call_type: |
| case relocInfo::opt_virtual_call_type: { |
| CompiledIC *ic = CompiledIC_at(&iter); |
| // Ok, to lookup references to zombies here |
| CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); |
| nmethod* nm = cb->as_nmethod_or_null(); |
| if( nm != NULL ) { |
| // Verify that inline caches pointing to both zombie and not_entrant methods 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_unsafe(csc->destination()); |
| nmethod* nm = cb->as_nmethod_or_null(); |
| if( nm != NULL ) { |
| // Verify that inline caches pointing to both zombie and not_entrant methods are clean |
| if (!nm->is_in_use() || (nm->method()->code() != nm)) { |
| assert(csc->is_clean(), "IC should be clean"); |
| } |
| } |
| break; |
| } |
| default: |
| break; |
| } |
| } |
| } |
| |
| // This is a private interface with the sweeper. |
| void nmethod::mark_as_seen_on_stack() { |
| assert(is_alive(), "Must be an alive method"); |
| // Set the traversal mark to ensure that the sweeper does 2 |
| // cleaning passes before moving to zombie. |
| set_stack_traversal_mark(NMethodSweeper::traversal_count()); |
| } |
| |
| // Tell if a non-entrant method can be converted to a zombie (i.e., |
| // there are no activations on the stack, not in use by the VM, |
| // and not in use by the ServiceThread) |
| bool nmethod::can_convert_to_zombie() { |
| assert(is_not_entrant(), "must be a non-entrant method"); |
| |
| // Since the nmethod sweeper only does partial sweep the sweeper's traversal |
| // count can be greater than the stack traversal count before it hits the |
| // nmethod for the second time. |
| return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && |
| !is_locked_by_vm(); |
| } |
| |
| 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(); |
| } |
| |
| void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { |
| |
| post_compiled_method_unload(); |
| |
| // Since this nmethod is being unloaded, make sure that dependencies |
| // recorded in instanceKlasses get flushed and pass non-NULL closure to |
| // indicate that this work is being done during a GC. |
| assert(Universe::heap()->is_gc_active(), "should only be called during gc"); |
| assert(is_alive != NULL, "Should be non-NULL"); |
| // A non-NULL is_alive closure indicates that this is being called during GC. |
| flush_dependencies(is_alive); |
| |
| // Break cycle between nmethod & method |
| LogTarget(Trace, class, unload) lt; |
| if (lt.is_enabled()) { |
| LogStream ls(lt); |
| ls.print_cr("making nmethod " INTPTR_FORMAT |
| " unloadable, Method*(" INTPTR_FORMAT |
| "), cause(" INTPTR_FORMAT ")", |
| p2i(this), p2i(_method), p2i(cause)); |
| if (!Universe::heap()->is_gc_active()) |
| cause->klass()->print_on(&ls); |
| } |
| // Unlink the osr method, so we do not look this up again |
| if (is_osr_method()) { |
| // Invalidate the osr nmethod only once |
| if (is_in_use()) { |
| invalidate_osr_method(); |
| } |
| #ifdef ASSERT |
| if (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 |
| } |
| |
| // If _method is already NULL the Method* is about to be unloaded, |
| // so we don't have to break the cycle. Note that it is possible to |
| // have the Method* live here, in case we unload the nmethod because |
| // it is pointing to some oop (other than the Method*) being unloaded. |
| if (_method != NULL) { |
| // OSR methods point to the Method*, but the Method* does not |
| // point back! |
| if (_method->code() == this) { |
| _method->clear_code(); // Break a cycle |
| } |
| _method = NULL; // Clear the method of this dead nmethod |
| } |
| |
| // Make the class unloaded - i.e., change state and notify sweeper |
| assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
| if (is_in_use()) { |
| // Transitioning directly from live to unloaded -- so |
| // we need to force a cache clean-up; remember this |
| // for later on. |
| CodeCache::set_needs_cache_clean(true); |
| } |
| |
| // Unregister must be done before the state change |
| Universe::heap()->unregister_nmethod(this); |
| |
| _state = unloaded; |
| |
| // Log the unloading. |
| log_state_change(); |
| |
| #if INCLUDE_JVMCI |
| // The method can only be unloaded after the pointer to the installed code |
| // Java wrapper is no longer alive. Here we need to clear out this weak |
| // reference to the dead object. Nulling out the reference has to happen |
| // after the method is unregistered since the original value may be still |
| // tracked by the rset. |
| maybe_invalidate_installed_code(); |
| // Clear these out after the nmethod has been unregistered and any |
| // updates to the InstalledCode instance have been performed. |
| _jvmci_installed_code = NULL; |
| _speculation_log = NULL; |
| #endif |
| |
| // The Method* is gone at this point |
| assert(_method == NULL, "Tautology"); |
| |
| set_osr_link(NULL); |
| NMethodSweeper::report_state_change(this); |
| } |
| |
| 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 |
| if (_state == unloaded) { |
| xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", |
| os::current_thread_id()); |
| } else { |
| xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", |
| os::current_thread_id(), |
| (_state == zombie ? " zombie='1'" : "")); |
| } |
| log_identity(xtty); |
| xtty->stamp(); |
| xtty->end_elem(); |
| } |
| } |
| |
| const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; |
| CompileTask::print_ul(this, state_msg); |
| if (PrintCompilation && _state != unloaded) { |
| print_on(tty, state_msg); |
| } |
| } |
| |
| /** |
| * Common functionality for both make_not_entrant and make_zombie |
| */ |
| bool nmethod::make_not_entrant_or_zombie(unsigned int state) { |
| assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); |
| assert(!is_zombie(), "should not already be a zombie"); |
| |
| if (_state == state) { |
| // 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; |
| } |
| |
| // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. |
| nmethodLocker nml(this); |
| methodHandle the_method(method()); |
| NoSafepointVerifier nsv; |
| |
| // during patching, depending on the nmethod state we must notify the GC that |
| // code has been unloaded, unregistering it. We cannot do this right while |
| // holding the Patching_lock because we need to use the CodeCache_lock. This |
| // would be prone to deadlocks. |
| // This flag is used to remember whether we need to later lock and unregister. |
| bool nmethod_needs_unregister = false; |
| |
| { |
| // invalidate osr nmethod before acquiring the patching lock since |
| // they both acquire leaf locks and we don't want a deadlock. |
| // This logic is equivalent to the logic below for patching the |
| // verified entry point of regular methods. We check that the |
| // nmethod is in use to ensure that it is invalidated only once. |
| if (is_osr_method() && is_in_use()) { |
| // this effectively makes the osr nmethod not entrant |
| invalidate_osr_method(); |
| } |
| |
| // Enter critical section. Does not block for safepoint. |
| MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
| |
| if (_state == state) { |
| // another thread already performed this transition so nothing |
| // to do, but return false to indicate this. |
| return false; |
| } |
| |
| // The caller can be calling the method statically or through an inline |
| // cache call. |
| if (!is_osr_method() && !is_not_entrant()) { |
| NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), |
| SharedRuntime::get_handle_wrong_method_stub()); |
| } |
| |
| if (is_in_use() && update_recompile_counts()) { |
| // It's a true state change, so mark the method as decompiled. |
| // Do it only for transition from alive. |
| inc_decompile_count(); |
| } |
| |
| // If the state is becoming a zombie, signal to unregister the nmethod with |
| // the heap. |
| // This nmethod may have already been unloaded during a full GC. |
| if ((state == zombie) && !is_unloaded()) { |
| nmethod_needs_unregister = true; |
| } |
| |
| // Must happen before state change. Otherwise we have a race condition in |
| // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately |
| // transition its state from 'not_entrant' to 'zombie' without having to wait |
| // for stack scanning. |
| if (state == not_entrant) { |
| mark_as_seen_on_stack(); |
| OrderAccess::storestore(); // _stack_traversal_mark and _state |
| } |
| |
| // Change state |
| _state = state; |
| |
| // Log the transition once |
| log_state_change(); |
| |
| // Invalidate while holding the patching lock |
| JVMCI_ONLY(maybe_invalidate_installed_code()); |
| |
| // Remove nmethod from method. |
| // We need to check if both the _code and _from_compiled_code_entry_point |
| // refer to this nmethod because there is a race in setting these two fields |
| // in Method* as seen in bugid 4947125. |
| // If the vep() points to the zombie nmethod, the memory for the nmethod |
| // could be flushed and the compiler and vtable stubs could still call |
| // through it. |
| if (method() != NULL && (method()->code() == this || |
| method()->from_compiled_entry() == verified_entry_point())) { |
| HandleMark hm; |
| method()->clear_code(false /* already owns Patching_lock */); |
| } |
| } // leave critical region under Patching_lock |
| |
| #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 |
| |
| // When the nmethod becomes zombie it is no longer alive so the |
| // dependencies must be flushed. nmethods in the not_entrant |
| // state will be flushed later when the transition to zombie |
| // happens or they get unloaded. |
| if (state == zombie) { |
| { |
| // Flushing dependencies must be done before any possible |
| // safepoint can sneak in, otherwise the oops used by the |
| // dependency logic could have become stale. |
| MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
| if (nmethod_needs_unregister) { |
| Universe::heap()->unregister_nmethod(this); |
| #ifdef JVMCI |
| _jvmci_installed_code = NULL; |
| _speculation_log = NULL; |
| #endif |
| } |
| flush_dependencies(NULL); |
| } |
| |
| // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload |
| // event and it hasn't already been reported for this nmethod then |
| // report it now. The event may have been reported earlier if the GC |
| // marked it for unloading). JvmtiDeferredEventQueue support means |
| // we no longer go to a safepoint here. |
| post_compiled_method_unload(); |
| |
| #ifdef ASSERT |
| // It's no longer safe to access the oops section since zombie |
| // nmethods aren't scanned for GC. |
| _oops_are_stale = true; |
| #endif |
| // the Method may be reclaimed by class unloading now that the |
| // nmethod is in zombie state |
| set_method(NULL); |
| } else { |
| assert(state == not_entrant, "other cases may need to be handled differently"); |
| } |
| |
| if (TraceCreateZombies) { |
| ResourceMark m; |
| tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie"); |
| } |
| |
| NMethodSweeper::report_state_change(this); |
| return true; |
| } |
| |
| void nmethod::flush() { |
| // Note that there are no valid oops in the nmethod anymore. |
| assert(!is_osr_method() || is_unloaded() || is_zombie(), |
| "osr nmethod must be unloaded or zombie before flushing"); |
| assert(is_zombie() || is_osr_method(), "must be a zombie method"); |
| assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); |
| assert_locked_or_safepoint(CodeCache_lock); |
| |
| // completely deallocate this method |
| Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); |
| if (PrintMethodFlushing) { |
| tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT |
| "/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(); |
| set_exception_cache(NULL); |
| while(ec != NULL) { |
| ExceptionCache* next = ec->next(); |
| delete ec; |
| ec = next; |
| } |
| |
| if (on_scavenge_root_list()) { |
| CodeCache::drop_scavenge_root_nmethod(this); |
| } |
| |
| #ifdef SHARK |
| ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); |
| #endif // SHARK |
| |
| CodeBlob::flush(); |
| CodeCache::free(this); |
| } |
| |
| // |
| // Notify all classes this nmethod is dependent on that it is no |
| // longer dependent. This should only be called in two situations. |
| // First, when a nmethod transitions to a zombie all dependents need |
| // to be clear. Since zombification happens at a safepoint there's no |
| // synchronization issues. The second place is a little more tricky. |
| // During phase 1 of mark sweep class unloading may happen and as a |
| // result some nmethods may get unloaded. In this case the flushing |
| // of dependencies must happen during phase 1 since after GC any |
| // dependencies in the unloaded nmethod won't be updated, so |
| // traversing the dependency information in unsafe. In that case this |
| // function is called with a non-NULL argument and this function only |
| // notifies instanceKlasses that are reachable |
| |
| void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { |
| assert_locked_or_safepoint(CodeCache_lock); |
| assert(Universe::heap()->is_gc_active() == (is_alive != NULL), |
| "is_alive is non-NULL if and only if we are called during GC"); |
| 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::remove_dependent_nmethod(call_site, this); |
| } else { |
| Klass* klass = deps.context_type(); |
| if (klass == NULL) { |
| continue; // ignore things like evol_method |
| } |
| // During GC the is_alive closure is non-NULL, and is used to |
| // determine liveness of dependees that need to be updated. |
| if (is_alive == NULL || klass->is_loader_alive(is_alive)) { |
| // The GC defers deletion of this entry, since there might be multiple threads |
| // iterating over the _dependencies graph. Other call paths are single-threaded |
| // and may delete it immediately. |
| bool delete_immediately = is_alive == NULL; |
| InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); |
| } |
| } |
| } |
| } |
| } |
| |
| |
| // If this oop is not live, the nmethod can be unloaded. |
| bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { |
| assert(root != NULL, "just checking"); |
| oop obj = *root; |
| if (obj == NULL || is_alive->do_object_b(obj)) { |
| return false; |
| } |
| |
| // If ScavengeRootsInCode is true, an nmethod might be unloaded |
| // simply because one of its constant oops has gone dead. |
| // No actual classes need to be unloaded in order for this to occur. |
| assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); |
| make_unloaded(is_alive, obj); |
| return true; |
| } |
| |
| // ------------------------------------------------------------------ |
| // post_compiled_method_load_event |
| // new method for install_code() path |
| // Transfer information from compilation to jvmti |
| void nmethod::post_compiled_method_load_event() { |
| |
| Method* moop = method(); |
| HOTSPOT_COMPILED_METHOD_LOAD( |
| (char *) moop->klass_name()->bytes(), |
| moop->klass_name()->utf8_length(), |
| (char *) moop->name()->bytes(), |
| moop->name()->utf8_length(), |
| (char *) moop->signature()->bytes(), |
| moop->signature()->utf8_length(), |
| insts_begin(), insts_size()); |
| |
| if (JvmtiExport::should_post_compiled_method_load() || |
| JvmtiExport::should_post_compiled_method_unload()) { |
| get_and_cache_jmethod_id(); |
| } |
| |
| if (JvmtiExport::should_post_compiled_method_load()) { |
| // Let the Service thread (which is a real Java thread) post the event |
| MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
| JvmtiDeferredEventQueue::enqueue( |
| JvmtiDeferredEvent::compiled_method_load_event(this)); |
| } |
| } |
| |
| jmethodID nmethod::get_and_cache_jmethod_id() { |
| if (_jmethod_id == NULL) { |
| // Cache the jmethod_id since it can no longer be looked up once the |
| // method itself has been marked for unloading. |
| _jmethod_id = method()->jmethod_id(); |
| } |
| return _jmethod_id; |
| } |
| |
| void nmethod::post_compiled_method_unload() { |
| if (unload_reported()) { |
| // During unloading we transition to unloaded and then to zombie |
| // and the unloading is reported during the first transition. |
| return; |
| } |
| |
| assert(_method != NULL && !is_unloaded(), "just checking"); |
| DTRACE_METHOD_UNLOAD_PROBE(method()); |
| |
| // If a JVMTI agent has enabled the CompiledMethodUnload event then |
| // post the event. Sometime later this nmethod will be made a zombie |
| // by the sweeper but the Method* will not be valid at that point. |
| // If the _jmethod_id is null then no load event was ever requested |
| // so don't bother posting the unload. The main reason for this is |
| // that the jmethodID is a weak reference to the Method* so if |
| // it's being unloaded there's no way to look it up since the weak |
| // ref will have been cleared. |
| if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { |
| assert(!unload_reported(), "already unloaded"); |
| JvmtiDeferredEvent event = |
| JvmtiDeferredEvent::compiled_method_unload_event(this, |
| _jmethod_id, insts_begin()); |
| MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); |
| JvmtiDeferredEventQueue::enqueue(event); |
| } |
| |
| // The JVMTI CompiledMethodUnload event can be enabled or disabled at |
| // any time. As the nmethod is being unloaded now we mark it has |
| // having the unload event reported - this will ensure that we don't |
| // attempt to report the event in the unlikely scenario where the |
| // event is enabled at the time the nmethod is made a zombie. |
| set_unload_reported(); |
| } |
| |
| bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { |
| assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); |
| |
| oop_Relocation* r = iter_at_oop->oop_reloc(); |
| // Traverse 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) { |
| // Unload this nmethod if the oop is dead. |
| if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { |
| return true;; |
| } |
| } |
| |
| return false; |
| } |
| |
| bool nmethod::do_unloading_scopes(BoolObjectClosure* is_alive, bool unloading_occurred) { |
| // Scopes |
| for (oop* p = oops_begin(); p < oops_end(); p++) { |
| if (*p == Universe::non_oop_word()) continue; // skip non-oops |
| if (can_unload(is_alive, p, unloading_occurred)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool nmethod::do_unloading_oops(address low_boundary, BoolObjectClosure* is_alive, bool unloading_occurred) { |
| // Compiled code |
| { |
| RelocIterator iter(this, low_boundary); |
| while (iter.next()) { |
| if (iter.type() == relocInfo::oop_type) { |
| if (unload_if_dead_at(&iter, is_alive, unloading_occurred)) { |
| return true; |
| } |
| } |
| } |
| } |
| |
| return do_unloading_scopes(is_alive, unloading_occurred); |
| } |
| |
| #if INCLUDE_JVMCI |
| bool nmethod::do_unloading_jvmci(BoolObjectClosure* is_alive, bool unloading_occurred) { |
| bool is_unloaded = false; |
| // Follow JVMCI method |
| BarrierSet* bs = Universe::heap()->barrier_set(); |
| if (_jvmci_installed_code != NULL) { |
| if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { |
| if (!is_alive->do_object_b(_jvmci_installed_code)) { |
| clear_jvmci_installed_code(); |
| } |
| } else { |
| if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { |
| return true; |
| } |
| } |
| } |
| |
| if (_speculation_log != NULL) { |
| if (!is_alive->do_object_b(_speculation_log)) { |
| bs->write_ref_nmethod_pre(&_speculation_log, this); |
| _speculation_log = NULL; |
| bs->write_ref_nmethod_post(&_speculation_log, this); |
| } |
| } |
| return is_unloaded; |
| } |
| #endif |
| |
| // Iterate over metadata calling this function. Used by RedefineClasses |
| void nmethod::metadata_do(void f(Metadata*)) { |
| address low_boundary = verified_entry_point(); |
| if (is_not_entrant()) { |
| low_boundary += NativeJump::instruction_size; |
| // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. |
| // (See comment above.) |
| } |
| { |
| // Visit all immediate references that are embedded in the instruction stream. |
| RelocIterator iter(this, low_boundary); |
| 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(md); |
| } |
| } else if (iter.type() == relocInfo::virtual_call_type) { |
| // Check compiledIC holders associated with this nmethod |
| CompiledIC *ic = CompiledIC_at(&iter); |
| if (ic->is_icholder_call()) { |
| CompiledICHolder* cichk = ic->cached_icholder(); |
| f(cichk->holder_method()); |
| f(cichk->holder_klass()); |
| } else { |
| Metadata* ic_oop = ic->cached_metadata(); |
| if (ic_oop != NULL) { |
| f(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(md); |
| } |
| |
| // Visit metadata not embedded in the other places. |
| if (_method != NULL) f(_method); |
| } |
| |
| void nmethod::oops_do(OopClosure* f, bool allow_zombie) { |
| // make sure the oops ready to receive visitors |
| assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); |
| assert(!is_unloaded(), "should not call follow on unloaded nmethod"); |
| |
| // If the method is not entrant or zombie then a JMP is plastered over the |
| // first few bytes. If an oop in the old code was there, that oop |
| // should not get GC'd. Skip the first few bytes of oops on |
| // not-entrant methods. |
| address low_boundary = verified_entry_point(); |
| if (is_not_entrant()) { |
| low_boundary += NativeJump::instruction_size; |
| // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. |
| // (See comment above.) |
| } |
| |
| #if INCLUDE_JVMCI |
| if (_jvmci_installed_code != NULL) { |
| f->do_oop((oop*) &_jvmci_installed_code); |
| } |
| if (_speculation_log != NULL) { |
| f->do_oop((oop*) &_speculation_log); |
| } |
| #endif |
| |
| RelocIterator iter(this, low_boundary); |
| |
| 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); |
| } |
| } |
| |
| #define NMETHOD_SENTINEL ((nmethod*)badAddress) |
| |
| nmethod* volatile nmethod::_oops_do_mark_nmethods; |
| |
| // An nmethod is "marked" if its _mark_link is set non-null. |
| // Even if it is the end of the linked list, it will have a non-null link value, |
| // as long as it is on the list. |
| // This code must be MP safe, because it is used from parallel GC passes. |
| bool nmethod::test_set_oops_do_mark() { |
| assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); |
| nmethod* observed_mark_link = _oops_do_mark_link; |
| if (observed_mark_link == NULL) { |
| // Claim this nmethod for this thread to mark. |
| observed_mark_link = (nmethod*) |
| Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); |
| if (observed_mark_link == NULL) { |
| |
| // Atomically append this nmethod (now claimed) to the head of the list: |
| nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; |
| for (;;) { |
| nmethod* required_mark_nmethods = observed_mark_nmethods; |
| _oops_do_mark_link = required_mark_nmethods; |
| observed_mark_nmethods = (nmethod*) |
| Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); |
| if (observed_mark_nmethods == required_mark_nmethods) |
| break; |
| } |
| // Mark was clear when we first saw this guy. |
| if (TraceScavenge) { print_on(tty, "oops_do, mark"); } |
| return false; |
| } |
| } |
| // On fall through, another racing thread marked this nmethod before we did. |
| return true; |
| } |
| |
| void nmethod::oops_do_marking_prologue() { |
| if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); } |
| assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); |
| // We use cmpxchg_ptr instead of regular assignment here because the user |
| // may fork a bunch of threads, and we need them all to see the same state. |
| void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); |
| guarantee(observed == NULL, "no races in this sequential code"); |
| } |
| |
| void nmethod::oops_do_marking_epilogue() { |
| assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); |
| nmethod* cur = _oops_do_mark_nmethods; |
| while (cur != NMETHOD_SENTINEL) { |
| assert(cur != NULL, "not NULL-terminated"); |
| nmethod* next = cur->_oops_do_mark_link; |
| cur->_oops_do_mark_link = NULL; |
| DEBUG_ONLY(cur->verify_oop_relocations()); |
| NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); |
| cur = next; |
| } |
| void* required = _oops_do_mark_nmethods; |
| void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); |
| guarantee(observed == required, "no races in this sequential code"); |
| if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); } |
| } |
| |
| class DetectScavengeRoot: public OopClosure { |
| bool _detected_scavenge_root; |
| public: |
| DetectScavengeRoot() : _detected_scavenge_root(false) |
| { NOT_PRODUCT(_print_nm = NULL); } |
| bool detected_scavenge_root() { return _detected_scavenge_root; } |
| virtual void do_oop(oop* p) { |
| if ((*p) != NULL && (*p)->is_scavengable()) { |
| NOT_PRODUCT(maybe_print(p)); |
| _detected_scavenge_root = true; |
| } |
| } |
| virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
| |
| #ifndef PRODUCT |
| nmethod* _print_nm; |
| void maybe_print(oop* p) { |
| if (_print_nm == NULL) return; |
| if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); |
| tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", |
| p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), |
| p2i(*p), p2i(p)); |
| (*p)->print(); |
| } |
| #endif //PRODUCT |
| }; |
| |
| bool nmethod::detect_scavenge_root_oops() { |
| DetectScavengeRoot detect_scavenge_root; |
| NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); |
| oops_do(&detect_scavenge_root); |
| return detect_scavenge_root.detected_scavenge_root(); |
| } |
| |
| inline bool includes(void* p, void* from, void* to) { |
| return from <= p && p < to; |
| } |
| |
| |
| void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { |
| assert(count >= 2, "must be sentinel values, at least"); |
| |
| #ifdef ASSERT |
| // must be sorted and unique; we do a binary search in find_pc_desc() |
| int prev_offset = pcs[0].pc_offset(); |
| assert(prev_offset == PcDesc::lower_offset_limit, |
| "must start with a sentinel"); |
| for (int i = 1; i < count; i++) { |
| int this_offset = pcs[i].pc_offset(); |
| assert(this_offset > prev_offset, "offsets must be sorted"); |
| prev_offset = this_offset; |
| } |
| assert(prev_offset == PcDesc::upper_offset_limit, |
| "must end with a sentinel"); |
| #endif //ASSERT |
| |
| // Search for MethodHandle invokes and tag the nmethod. |
| for (int i = 0; i < count; i++) { |
| if (pcs[i].is_method_handle_invoke()) { |
| set_has_method_handle_invokes(true); |
| break; |
| } |
| } |
| assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); |
| |
| int size = count * sizeof(PcDesc); |
| assert(scopes_pcs_size() >= size, "oob"); |
| memcpy(scopes_pcs_begin(), pcs, size); |
| |
| // Adjust the final sentinel downward. |
| PcDesc* last_pc = &scopes_pcs_begin()[count-1]; |
| assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); |
| last_pc->set_pc_offset(content_size() + 1); |
| for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { |
| // Fill any rounding gaps with copies of the last record. |
| last_pc[1] = last_pc[0]; |
| } |
| // The following assert could fail if sizeof(PcDesc) is not |
| // an integral multiple of oopSize (the rounding term). |
| // If it fails, change the logic to always allocate a multiple |
| // of sizeof(PcDesc), and fill unused words with copies of *last_pc. |
| assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); |
| } |
| |
| void nmethod::copy_scopes_data(u_char* buffer, int size) { |
| assert(scopes_data_size() >= size, "oob"); |
| memcpy(scopes_data_begin(), buffer, size); |
| } |
| |
| #ifdef ASSERT |
| static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { |
| PcDesc* lower = search.scopes_pcs_begin(); |
| PcDesc* upper = search.scopes_pcs_end(); |
| lower += 1; // exclude initial sentinel |
| PcDesc* res = NULL; |
| for (PcDesc* p = lower; p < upper; p++) { |
| NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc |
| if (match_desc(p, pc_offset, approximate)) { |
| if (res == NULL) |
| res = p; |
| else |
| res = (PcDesc*) badAddress; |
| } |
| } |
| return res; |
| } |
| #endif |
| |
| |
| // Finds a PcDesc with real-pc equal to "pc" |
| PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { |
| address base_address = search.code_begin(); |
| if ((pc < base_address) || |
| (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { |
| return NULL; // PC is wildly out of range |
| } |
| int pc_offset = (int) (pc - base_address); |
| |
| // Check the PcDesc cache if it contains the desired PcDesc |
| // (This as an almost 100% hit rate.) |
| PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); |
| if (res != NULL) { |
| assert(res == linear_search(search, pc_offset, approximate), "cache ok"); |
| return res; |
| } |
| |
| // Fallback algorithm: quasi-linear search for the PcDesc |
| // Find the last pc_offset less than the given offset. |
| // The successor must be the required match, if there is a match at all. |
| // (Use a fixed radix to avoid expensive affine pointer arithmetic.) |
| PcDesc* lower = search.scopes_pcs_begin(); |
| PcDesc* upper = search.scopes_pcs_end(); |
| upper -= 1; // exclude final sentinel |
| if (lower >= upper) return NULL; // native method; no PcDescs at all |
| |
| #define assert_LU_OK \ |
| /* invariant on lower..upper during the following search: */ \ |
| assert(lower->pc_offset() < pc_offset, "sanity"); \ |
| assert(upper->pc_offset() >= pc_offset, "sanity") |
| assert_LU_OK; |
| |
| // Use the last successful return as a split point. |
| PcDesc* mid = _pc_desc_cache.last_pc_desc(); |
| NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); |
| if (mid->pc_offset() < pc_offset) { |
| lower = mid; |
| } else { |
| upper = mid; |
| } |
| |
| // Take giant steps at first (4096, then 256, then 16, then 1) |
| const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); |
| const int RADIX = (1 << LOG2_RADIX); |
| for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { |
| while ((mid = lower + step) < upper) { |
| assert_LU_OK; |
| NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); |
| if (mid->pc_offset() < pc_offset) { |
| lower = mid; |
| } else { |
| upper = mid; |
| break; |
| } |
| } |
| assert_LU_OK; |
| } |
| |
| // Sneak up on the value with a linear search of length ~16. |
| while (true) { |
| assert_LU_OK; |
| mid = lower + 1; |
| NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); |
| if (mid->pc_offset() < pc_offset) { |
| lower = mid; |
| } else { |
| upper = mid; |
| break; |
| } |
| } |
| #undef assert_LU_OK |
| |
| if (match_desc(upper, pc_offset, approximate)) { |
| assert(upper == linear_search(search, pc_offset, approximate), "search ok"); |
| _pc_desc_cache.add_pc_desc(upper); |
| return upper; |
| } else { |
| assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); |
| return NULL; |
| } |
| } |
| |
| |
| void nmethod::check_all_dependencies(DepChange& changes) { |
| // Checked dependencies are allocated into this ResourceMark |
| ResourceMark rm; |
| |
| // Turn off dependency tracing while actually testing dependencies. |
| NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); |
| |
| typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, |
| &DependencySignature::equals, 11027> DepTable; |
| |
| DepTable* table = new DepTable(); |
| |
| // Iterate over live nmethods and check dependencies of all nmethods that are not |
| // marked for deoptimization. A particular dependency is only checked once. |
| NMethodIterator iter; |
| while(iter.next()) { |
| nmethod* nm = iter.method(); |
| // Only notify for live nmethods |
| if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { |
| for (Dependencies::DepStream deps(nm); deps.next(); ) { |
| // Construct abstraction of a dependency. |
| DependencySignature* current_sig = new DependencySignature(deps); |
| |
| // Determine if dependency is already checked. table->put(...) returns |
| // 'true' if the dependency is added (i.e., was not in the hashtable). |
| if (table->put(*current_sig, 1)) { |
| if (deps.check_dependency() != NULL) { |
| // Dependency checking failed. Print out information about the failed |
| // dependency and finally fail with an assert. We can fail here, since |
| // dependency checking is never done in a product build. |
| tty->print_cr("Failed dependency:"); |
| changes.print(); |
| nm->print(); |
| nm->print_dependencies(); |
| assert(false, "Should have been marked for deoptimization"); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| bool nmethod::check_dependency_on(DepChange& changes) { |
| // What has happened: |
| // 1) a new class dependee has been added |
| // 2) dependee and all its super classes have been marked |
| bool found_check = false; // set true if we are upset |
| for (Dependencies::DepStream deps(this); deps.next(); ) { |
| // Evaluate only relevant dependencies. |
| if (deps.spot_check_dependency_at(changes) != NULL) { |
| found_check = true; |
| NOT_DEBUG(break); |
| } |
| } |
| return found_check; |
| } |
| |
| bool nmethod::is_evol_dependent_on(Klass* dependee) { |
| InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); |
| Array<Method*>* dependee_methods = dependee_ik->methods(); |
| for (Dependencies::DepStream deps(this); deps.next(); ) { |
| if (deps.type() == Dependencies::evol_method) { |
| Method* method = deps.method_argument(0); |
| for (int j = 0; j < dependee_methods->length(); j++) { |
| if (dependee_methods->at(j) == method) { |
| if (log_is_enabled(Debug, redefine, class, nmethod)) { |
| ResourceMark rm; |
| log_debug(redefine, class, nmethod) |
| ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", |
| _method->method_holder()->external_name(), |
| _method->name()->as_C_string(), |
| _method->signature()->as_C_string(), |
| compile_id(), |
| method->method_holder()->external_name(), |
| method->name()->as_C_string(), |
| method->signature()->as_C_string()); |
| } |
| if (TraceDependencies || LogCompilation) |
| deps.log_dependency(dependee); |
| return true; |
| } |
| } |
| } |
| } |
| return false; |
| } |
| |
| // Called from mark_for_deoptimization, when dependee is invalidated. |
| bool nmethod::is_dependent_on_method(Method* dependee) { |
| for (Dependencies::DepStream deps(this); deps.next(); ) { |
| if (deps.type() != Dependencies::evol_method) |
| continue; |
| Method* method = deps.method_argument(0); |
| if (method == dependee) return true; |
| } |
| return false; |
| } |
| |
| |
| bool nmethod::is_patchable_at(address instr_addr) { |
| assert(insts_contains(instr_addr), "wrong nmethod used"); |
| if (is_zombie()) { |
| // a zombie may never be patched |
| return false; |
| } |
| return true; |
| } |
| |
| |
| address nmethod::continuation_for_implicit_exception(address pc) { |
| // Exception happened outside inline-cache check code => we are inside |
| // an active nmethod => use cpc to determine a return address |
| int exception_offset = pc - code_begin(); |
| int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); |
| #ifdef ASSERT |
| if (cont_offset == 0) { |
| Thread* thread = Thread::current(); |
| ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY |
| HandleMark hm(thread); |
| ResourceMark rm(thread); |
| CodeBlob* cb = CodeCache::find_blob(pc); |
| assert(cb != NULL && cb == this, ""); |
| ttyLocker ttyl; |
| tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); |
| print(); |
| method()->print_codes(); |
| print_code(); |
| print_pcs(); |
| } |
| #endif |
| if (cont_offset == 0) { |
| // Let the normal error handling report the exception |
| return NULL; |
| } |
| return code_begin() + cont_offset; |
| } |
| |
| |
| |
| void nmethod_init() { |
| // make sure you didn't forget to adjust the filler fields |
| assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); |
| } |
| |
| |
| //------------------------------------------------------------------------------------------- |
| |
| |
| // QQQ might we make this work from a frame?? |
| nmethodLocker::nmethodLocker(address pc) { |
| CodeBlob* cb = CodeCache::find_blob(pc); |
| guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); |
| _nm = cb->as_compiled_method(); |
| lock_nmethod(_nm); |
| } |
| |
| // Only JvmtiDeferredEvent::compiled_method_unload_event() |
| // should pass zombie_ok == true. |
| void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { |
| if (cm == NULL) return; |
| if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method |
| nmethod* nm = cm->as_nmethod(); |
| Atomic::inc(&nm->_lock_count); |
| assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); |
| } |
| |
| void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { |
| if (cm == NULL) return; |
| if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method |
| nmethod* nm = cm->as_nmethod(); |
| Atomic::dec(&nm->_lock_count); |
| assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); |
| } |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Verification |
| |
| class VerifyOopsClosure: public OopClosure { |
| nmethod* _nm; |
| bool _ok; |
| public: |
| VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } |
| bool ok() { return _ok; } |
| virtual void do_oop(oop* p) { |
| if (oopDesc::is_oop_or_null(*p)) return; |
| if (_ok) { |
| _nm->print_nmethod(true); |
| _ok = false; |
| } |
| tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", |
| p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); |
| } |
| virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
| }; |
| |
| void nmethod::verify() { |
| |
| // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant |
| // seems odd. |
| |
| if (is_zombie() || is_not_entrant() || is_unloaded()) |
| return; |
| |
| // Make sure all the entry points are correctly aligned for patching. |
| NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); |
| |
| // assert(oopDesc::is_oop(method()), "must be valid"); |
| |
| ResourceMark rm; |
| |
| if (!CodeCache::contains(this)) { |
| fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); |
| } |
| |
| if(is_native_method() ) |
| return; |
| |
| nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); |
| if (nm != this) { |
| fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); |
| } |
| |
| for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { |
| if (! p->verify(this)) { |
| tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); |
| } |
| } |
| |
| VerifyOopsClosure voc(this); |
| oops_do(&voc); |
| assert(voc.ok(), "embedded oops must be OK"); |
| verify_scavenge_root_oops(); |
| |
| verify_scopes(); |
| } |
| |
| |
| void nmethod::verify_interrupt_point(address call_site) { |
| // Verify IC only when nmethod installation is finished. |
| bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed |
| || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state |
| if (is_installed) { |
| Thread *cur = Thread::current(); |
| if (CompiledIC_lock->owner() == cur || |
| ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && |
| SafepointSynchronize::is_at_safepoint())) { |
| CompiledIC_at(this, call_site); |
| CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); |
| } else { |
| MutexLocker ml_verify (CompiledIC_lock); |
| CompiledIC_at(this, call_site); |
| } |
| } |
| |
| PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); |
| assert(pd != NULL, "PcDesc must exist"); |
| for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), |
| pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), |
| pd->return_oop()); |
| !sd->is_top(); sd = sd->sender()) { |
| sd->verify(); |
| } |
| } |
| |
| void nmethod::verify_scopes() { |
| if( !method() ) return; // Runtime stubs have no scope |
| if (method()->is_native()) return; // Ignore stub methods. |
| // iterate through all interrupt point |
| // and verify the debug information is valid. |
| RelocIterator iter((nmethod*)this); |
| while (iter.next()) { |
| address stub = NULL; |
| switch (iter.type()) { |
| case relocInfo::virtual_call_type: |
| verify_interrupt_point(iter.addr()); |
| break; |
| case relocInfo::opt_virtual_call_type: |
| stub = iter.opt_virtual_call_reloc()->static_stub(false); |
| verify_interrupt_point(iter.addr()); |
| break; |
| case relocInfo::static_call_type: |
| stub = iter.static_call_reloc()->static_stub(false); |
| //verify_interrupt_point(iter.addr()); |
| break; |
| case relocInfo::runtime_call_type: |
| case relocInfo::runtime_call_w_cp_type: { |
| address destination = iter.reloc()->value(); |
| // Right now there is no way to find out which entries support |
| // an interrupt point. It would be nice if we had this |
| // information in a table. |
| break; |
| } |
| default: |
| break; |
| } |
| assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); |
| } |
| } |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Non-product code |
| #ifndef PRODUCT |
| |
| class DebugScavengeRoot: public OopClosure { |
| nmethod* _nm; |
| bool _ok; |
| public: |
| DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } |
| bool ok() { return _ok; } |
| virtual void do_oop(oop* p) { |
| if ((*p) == NULL || !(*p)->is_scavengable()) return; |
| if (_ok) { |
| _nm->print_nmethod(true); |
| _ok = false; |
| } |
| tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", |
| p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); |
| (*p)->print(); |
| } |
| virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
| }; |
| |
| void nmethod::verify_scavenge_root_oops() { |
| if (UseG1GC) { |
| return; |
| } |
| |
| if (!on_scavenge_root_list()) { |
| // Actually look inside, to verify the claim that it's clean. |
| DebugScavengeRoot debug_scavenge_root(this); |
| oops_do(&debug_scavenge_root); |
| if (!debug_scavenge_root.ok()) |
| fatal("found an unadvertised bad scavengable oop in the code cache"); |
| } |
| assert(scavenge_root_not_marked(), ""); |
| } |
| |
| #endif // PRODUCT |
| |
| // Printing operations |
| |
| void nmethod::print() const { |
| ResourceMark rm; |
| ttyLocker ttyl; // keep the following output all in one block |
| |
| tty->print("Compiled method "); |
| |
| if (is_compiled_by_c1()) { |
| tty->print("(c1) "); |
| } else if (is_compiled_by_c2()) { |
| tty->print("(c2) "); |
| } else if (is_compiled_by_shark()) { |
| tty->print("(shark) "); |
| } else if (is_compiled_by_jvmci()) { |
| tty->print("(JVMCI) "); |
| } else { |
| tty->print("(nm) "); |
| } |
| |
| print_on(tty, NULL); |
| |
| if (WizardMode) { |
| tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); |
| tty->print(" for method " INTPTR_FORMAT , p2i(method())); |
| tty->print(" { "); |
| tty->print_cr("%s ", state()); |
| if (on_scavenge_root_list()) tty->print("scavenge_root "); |
| tty->print_cr("}:"); |
| } |
| if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(this), |
| p2i(this) + size(), |
| size()); |
| if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(relocation_begin()), |
| p2i(relocation_end()), |
| relocation_size()); |
| if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(consts_begin()), |
| p2i(consts_end()), |
| consts_size()); |
| if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(insts_begin()), |
| p2i(insts_end()), |
| insts_size()); |
| if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(stub_begin()), |
| p2i(stub_end()), |
| stub_size()); |
| if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(oops_begin()), |
| p2i(oops_end()), |
| oops_size()); |
| if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(metadata_begin()), |
| p2i(metadata_end()), |
| metadata_size()); |
| if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(scopes_data_begin()), |
| p2i(scopes_data_end()), |
| scopes_data_size()); |
| if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(scopes_pcs_begin()), |
| p2i(scopes_pcs_end()), |
| scopes_pcs_size()); |
| if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(dependencies_begin()), |
| p2i(dependencies_end()), |
| dependencies_size()); |
| if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(handler_table_begin()), |
| p2i(handler_table_end()), |
| handler_table_size()); |
| if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", |
| p2i(nul_chk_table_begin()), |
| p2i(nul_chk_table_end()), |
| nul_chk_table_size()); |
| } |
| |
| #ifndef PRODUCT |
| |
| void nmethod::print_scopes() { |
| // Find the first pc desc for all scopes in the code and print it. |
| ResourceMark rm; |
| for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { |
| if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) |
| continue; |
| |
| ScopeDesc* sd = scope_desc_at(p->real_pc(this)); |
| while (sd != NULL) { |
| sd->print_on(tty, p); |
| sd = sd->sender(); |
| } |
| } |
| } |
| |
| void nmethod::print_dependencies() { |
| ResourceMark rm; |
| ttyLocker ttyl; // keep the following output all in one block |
| tty->print_cr("Dependencies:"); |
| for (Dependencies::DepStream deps(this); deps.next(); ) { |
| deps.print_dependency(); |
| Klass* ctxk = deps.context_type(); |
| if (ctxk != NULL) { |
| if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { |
| tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); |
| } |
| } |
| deps.log_dependency(); // put it into the xml log also |
| } |
| } |
| |
| |
| void nmethod::print_relocations() { |
| ResourceMark m; // in case methods get printed via the debugger |
| tty->print_cr("relocations:"); |
| RelocIterator iter(this); |
| iter.print(); |
| } |
| |
| |
| void nmethod::print_pcs() { |
| ResourceMark m; // in case methods get printed via debugger |
| tty->print_cr("pc-bytecode offsets:"); |
| for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { |
| p->print(this); |
| } |
| } |
| |
| void nmethod::print_recorded_oops() { |
| tty->print_cr("Recorded oops:"); |
| for (int i = 0; i < oops_count(); i++) { |
| oop o = oop_at(i); |
| tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); |
| if (o == (oop)Universe::non_oop_word()) { |
| tty->print("non-oop word"); |
| } else { |
| o->print_value(); |
| } |
| tty->cr(); |
| } |
| } |
| |
| void nmethod::print_recorded_metadata() { |
| tty->print_cr("Recorded metadata:"); |
| for (int i = 0; i < metadata_count(); i++) { |
| Metadata* m = metadata_at(i); |
| tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); |
| if (m == (Metadata*)Universe::non_oop_word()) { |
| tty->print("non-metadata word"); |
| } else { |
| m->print_value_on_maybe_null(tty); |
| } |
| tty->cr(); |
| } |
| } |
| |
| #endif // PRODUCT |
| |
| const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { |
| RelocIterator iter(this, begin, end); |
| bool have_one = false; |
| while (iter.next()) { |
| have_one = true; |
| switch (iter.type()) { |
| case relocInfo::none: return "no_reloc"; |
| case relocInfo::oop_type: { |
| stringStream st; |
| oop_Relocation* r = iter.oop_reloc(); |
| oop obj = r->oop_value(); |
| st.print("oop("); |
| if (obj == NULL) st.print("NULL"); |
| else obj->print_value_on(&st); |
| st.print(")"); |
| return st.as_string(); |
| } |
| case relocInfo::metadata_type: { |
| stringStream st; |
| metadata_Relocation* r = iter.metadata_reloc(); |
| Metadata* obj = r->metadata_value(); |
| st.print("metadata("); |
| if (obj == NULL) st.print("NULL"); |
| else obj->print_value_on(&st); |
| st.print(")"); |
| return st.as_string(); |
| } |
| case relocInfo::runtime_call_type: |
| case relocInfo::runtime_call_w_cp_type: { |
| stringStream st; |
| st.print("runtime_call"); |
| CallRelocation* r = (CallRelocation*)iter.reloc(); |
| address dest = r->destination(); |
| CodeBlob* cb = CodeCache::find_blob(dest); |
| if (cb != NULL) { |
| st.print(" %s", cb->name()); |
| } else { |
| ResourceMark rm; |
| const int buflen = 1024; |
| char* buf = NEW_RESOURCE_ARRAY(char, buflen); |
| int offset; |
| if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { |
| st.print(" %s", buf); |
| if (offset != 0) { |
| st.print("+%d", offset); |
| } |
| } |
| } |
| return st.as_string(); |
| } |
| case relocInfo::virtual_call_type: { |
| stringStream st; |
| st.print_raw("virtual_call"); |
| virtual_call_Relocation* r = iter.virtual_call_reloc(); |
| Method* m = r->method_value(); |
| if (m != NULL) { |
| assert(m->is_method(), ""); |
| m->print_short_name(&st); |
| } |
| return st.as_string(); |
| } |
| case relocInfo::opt_virtual_call_type: { |
| stringStream st; |
| st.print_raw("optimized virtual_call"); |
| opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); |
| Method* m = r->method_value(); |
| if (m != NULL) { |
| assert(m->is_method(), ""); |
| m->print_short_name(&st); |
| } |
| return st.as_string(); |
| } |
| case relocInfo::static_call_type: { |
| stringStream st; |
| st.print_raw("static_call"); |
| static_call_Relocation* r = iter.static_call_reloc(); |
| Method* m = r->method_value(); |
| if (m != NULL) { |
| assert(m->is_method(), ""); |
| m->print_short_name(&st); |
| } |
| return st.as_string(); |
| } |
| case relocInfo::static_stub_type: return "static_stub"; |
| case relocInfo::external_word_type: return "external_word"; |
| case relocInfo::internal_word_type: return "internal_word"; |
| case relocInfo::section_word_type: return "section_word"; |
| case relocInfo::poll_type: return "poll"; |
| case relocInfo::poll_return_type: return "poll_return"; |
| case relocInfo::type_mask: return "type_bit_mask"; |
| |
| default: |
| break; |
| } |
| } |
| return have_one ? "other" : NULL; |
| } |
| |
| // Return a the last scope in (begin..end] |
| ScopeDesc* nmethod::scope_desc_in(address begin, address end) { |
| PcDesc* p = pc_desc_near(begin+1); |
| if (p != NULL && p->real_pc(this) <= end) { |
| return new ScopeDesc(this, p->scope_decode_offset(), |
| p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), |
| p->return_oop()); |
| } |
| return NULL; |
| } |
| |
| void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { |
| if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); |
| if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); |
| if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); |
| if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); |
| if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); |
| |
| if (has_method_handle_invokes()) |
| if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); |
| |
| if (block_begin == consts_begin()) stream->print_cr("[Constants]"); |
| |
| if (block_begin == entry_point()) { |
| methodHandle m = method(); |
| if (m.not_null()) { |
| stream->print(" # "); |
| m->print_value_on(stream); |
| stream->cr(); |
| } |
| if (m.not_null() && !is_osr_method()) { |
| ResourceMark rm; |
| int sizeargs = m->size_of_parameters(); |
| BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); |
| VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); |
| { |
| int sig_index = 0; |
| if (!m->is_static()) |
| sig_bt[sig_index++] = T_OBJECT; // 'this' |
| for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { |
| BasicType t = ss.type(); |
| sig_bt[sig_index++] = t; |
| if (type2size[t] == 2) { |
| sig_bt[sig_index++] = T_VOID; |
| } else { |
| assert(type2size[t] == 1, "size is 1 or 2"); |
| } |
| } |
| assert(sig_index == sizeargs, ""); |
| } |
| const char* spname = "sp"; // make arch-specific? |
| intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); |
| int stack_slot_offset = this->frame_size() * wordSize; |
| int tab1 = 14, tab2 = 24; |
| int sig_index = 0; |
| int arg_index = (m->is_static() ? 0 : -1); |
| bool did_old_sp = false; |
| for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { |
| bool at_this = (arg_index == -1); |
| bool at_old_sp = false; |
| BasicType t = (at_this ? T_OBJECT : ss.type()); |
| assert(t == sig_bt[sig_index], "sigs in sync"); |
| if (at_this) |
| stream->print(" # this: "); |
| else |
| stream->print(" # parm%d: ", arg_index); |
| stream->move_to(tab1); |
| VMReg fst = regs[sig_index].first(); |
| VMReg snd = regs[sig_index].second(); |
| if (fst->is_reg()) { |
| stream->print("%s", fst->name()); |
| if (snd->is_valid()) { |
| stream->print(":%s", snd->name()); |
| } |
| } else if (fst->is_stack()) { |
| int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; |
| if (offset == stack_slot_offset) at_old_sp = true; |
| stream->print("[%s+0x%x]", spname, offset); |
| } else { |
| stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); |
| } |
| stream->print(" "); |
| stream->move_to(tab2); |
| stream->print("= "); |
| if (at_this) { |
| m->method_holder()->print_value_on(stream); |
| } else { |
| bool did_name = false; |
| if (!at_this && ss.is_object()) { |
| Symbol* name = ss.as_symbol_or_null(); |
| if (name != NULL) { |
| name->print_value_on(stream); |
| did_name = true; |
| } |
| } |
| if (!did_name) |
| stream->print("%s", type2name(t)); |
| } |
| if (at_old_sp) { |
| stream->print(" (%s of caller)", spname); |
| did_old_sp = true; |
| } |
| stream->cr(); |
| sig_index += type2size[t]; |
| arg_index += 1; |
| if (!at_this) ss.next(); |
| } |
| if (!did_old_sp) { |
| stream->print(" # "); |
| stream->move_to(tab1); |
| stream->print("[%s+0x%x]", spname, stack_slot_offset); |
| stream->print(" (%s of caller)", spname); |
| stream->cr(); |
| } |
| } |
| } |
| } |
| |
| void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { |
| // First, find an oopmap in (begin, end]. |
| // We use the odd half-closed interval so that oop maps and scope descs |
| // which are tied to the byte after a call are printed with the call itself. |
| address base = code_begin(); |
| ImmutableOopMapSet* oms = oop_maps(); |
| if (oms != NULL) { |
| for (int i = 0, imax = oms->count(); i < imax; i++) { |
| const ImmutableOopMapPair* pair = oms->pair_at(i); |
| const ImmutableOopMap* om = pair->get_from(oms); |
| address pc = base + pair->pc_offset(); |
| if (pc > begin) { |
| if (pc <= end) { |
| st->move_to(column); |
| st->print("; "); |
| om->print_on(st); |
| } |
| break; |
| } |
| } |
| } |
| |
| // Print any debug info present at this pc. |
| ScopeDesc* sd = scope_desc_in(begin, end); |
| if (sd != NULL) { |
| st->move_to(column); |
| if (sd->bci() == SynchronizationEntryBCI) { |
| st->print(";*synchronization entry"); |
| } else { |
| if (sd->method() == NULL) { |
| st->print("method is NULL"); |
| } else if (sd->method()->is_native()) { |
| st->print("method is native"); |
| } else { |
| Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); |
| st->print(";*%s", Bytecodes::name(bc)); |
| switch (bc) { |
| case Bytecodes::_invokevirtual: |
| case Bytecodes::_invokespecial: |
| case Bytecodes::_invokestatic: |
| case Bytecodes::_invokeinterface: |
| { |
| Bytecode_invoke invoke(sd->method(), sd->bci()); |
| st->print(" "); |
| if (invoke.name() != NULL) |
| invoke.name()->print_symbol_on(st); |
| else |
| st->print("<UNKNOWN>"); |
| break; |
| } |
| case Bytecodes::_getfield: |
| case Bytecodes::_putfield: |
| case Bytecodes::_getstatic: |
| case Bytecodes::_putstatic: |
| { |
| Bytecode_field field(sd->method(), sd->bci()); |
| st->print(" "); |
| if (field.name() != NULL) |
| field.name()->print_symbol_on(st); |
| else |
| st->print("<UNKNOWN>"); |
| } |
| default: |
| break; |
| } |
| } |
| st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); |
| } |
| |
| // Print all scopes |
| for (;sd != NULL; sd = sd->sender()) { |
| st->move_to(column); |
| st->print("; -"); |
| if (sd->method() == NULL) { |
| st->print("method is NULL"); |
| } else { |
| sd->method()->print_short_name(st); |
| } |
| int lineno = sd->method()->line_number_from_bci(sd->bci()); |
| if (lineno != -1) { |
| st->print("@%d (line %d)", sd->bci(), lineno); |
| } else { |
| st->print("@%d", sd->bci()); |
| } |
| st->cr(); |
| } |
| } |
| |
| // Print relocation information |
| const char* str = reloc_string_for(begin, end); |
| if (str != NULL) { |
| if (sd != NULL) st->cr(); |
| st->move_to(column); |
| st->print("; {%s}", str); |
| } |
| int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); |
| if (cont_offset != 0) { |
| st->move_to(column); |
| st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); |
| } |
| |
| } |
| |
| class DirectNativeCallWrapper: public NativeCallWrapper { |
| private: |
| NativeCall* _call; |
| |
| public: |
| DirectNativeCallWrapper(NativeCall* call) : _call(call) {} |
| |
| virtual address destination() const { return _call->destination(); } |
| virtual address instruction_address() const { return _call->instruction_address(); } |
| virtual address next_instruction_address() const { return _call->next_instruction_address(); } |
| virtual address return_address() const { return _call->return_address(); } |
| |
| virtual address get_resolve_call_stub(bool is_optimized) const { |
| if (is_optimized) { |
| return SharedRuntime::get_resolve_opt_virtual_call_stub(); |
| } |
| return SharedRuntime::get_resolve_virtual_call_stub(); |
| } |
| |
| virtual void set_destination_mt_safe(address dest) { |
| #if INCLUDE_AOT |
| if (UseAOT) { |
| CodeBlob* callee = CodeCache::find_blob(dest); |
| CompiledMethod* cm = callee->as_compiled_method_or_null(); |
| if (cm != NULL && cm->is_far_code()) { |
| // Temporary fix, see JDK-8143106 |
| CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); |
| csc->set_to_far(methodHandle(cm->method()), dest); |
| return; |
| } |
| } |
| #endif |
| _call->set_destination_mt_safe(dest); |
| } |
| |
| virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { |
| CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); |
| #if INCLUDE_AOT |
| if (info.to_aot()) { |
| csc->set_to_far(method, info.entry()); |
| } else |
| #endif |
| { |
| csc->set_to_interpreted(method, info.entry()); |
| } |
| } |
| |
| virtual void verify() const { |
| // make sure code pattern is actually a call imm32 instruction |
| _call->verify(); |
| if (os::is_MP()) { |
| _call->verify_alignment(); |
| } |
| } |
| |
| virtual void verify_resolve_call(address dest) const { |
| CodeBlob* db = CodeCache::find_blob_unsafe(dest); |
| assert(!db->is_adapter_blob(), "must use stub!"); |
| } |
| |
| virtual bool is_call_to_interpreted(address dest) const { |
| CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); |
| return cb->contains(dest); |
| } |
| |
| virtual bool is_safe_for_patching() const { return false; } |
| |
| virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { |
| return nativeMovConstReg_at(r->cached_value()); |
| } |
| |
| virtual void *get_data(NativeInstruction* instruction) const { |
| return (void*)((NativeMovConstReg*) instruction)->data(); |
| } |
| |
| virtual void set_data(NativeInstruction* instruction, intptr_t data) { |
| ((NativeMovConstReg*) instruction)->set_data(data); |
| } |
| }; |
| |
| NativeCallWrapper* nmethod::call_wrapper_at(address call) const { |
| return new DirectNativeCallWrapper((NativeCall*) call); |
| } |
| |
| NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { |
| return new DirectNativeCallWrapper(nativeCall_before(return_pc)); |
| } |
| |
| address nmethod::call_instruction_address(address pc) const { |
| if (NativeCall::is_call_before(pc)) { |
| NativeCall *ncall = nativeCall_before(pc); |
| return ncall->instruction_address(); |
| } |
| return NULL; |
| } |
| |
| CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { |
| return CompiledDirectStaticCall::at(call_site); |
| } |
| |
| CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { |
| return CompiledDirectStaticCall::at(call_site); |
| } |
| |
| CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { |
| return CompiledDirectStaticCall::before(return_addr); |
| } |
| |
| #ifndef PRODUCT |
| |
| void nmethod::print_value_on(outputStream* st) const { |
| st->print("nmethod"); |
| print_on(st, NULL); |
| } |
| |
| void nmethod::print_calls(outputStream* st) { |
| RelocIterator iter(this); |
| while (iter.next()) { |
| switch (iter.type()) { |
| case relocInfo::virtual_call_type: |
| case relocInfo::opt_virtual_call_type: { |
| VerifyMutexLocker mc(CompiledIC_lock); |
| CompiledIC_at(&iter)->print(); |
| break; |
| } |
| case relocInfo::static_call_type: |
| st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); |
| CompiledDirectStaticCall::at(iter.reloc())->print(); |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| |
| void nmethod::print_handler_table() { |
| ExceptionHandlerTable(this).print(); |
| } |
| |
| void nmethod::print_nul_chk_table() { |
| ImplicitExceptionTable(this).print(code_begin()); |
| } |
| |
| void nmethod::print_statistics() { |
| ttyLocker ttyl; |
| if (xtty != NULL) xtty->head("statistics type='nmethod'"); |
| native_nmethod_stats.print_native_nmethod_stats(); |
| #ifdef COMPILER1 |
| c1_java_nmethod_stats.print_nmethod_stats("C1"); |
| #endif |
| #ifdef COMPILER2 |
| c2_java_nmethod_stats.print_nmethod_stats("C2"); |
| #endif |
| #if INCLUDE_JVMCI |
| jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); |
| #endif |
| #ifdef SHARK |
| shark_java_nmethod_stats.print_nmethod_stats("Shark"); |
| #endif |
| unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); |
| DebugInformationRecorder::print_statistics(); |
| #ifndef PRODUCT |
| pc_nmethod_stats.print_pc_stats(); |
| #endif |
| Dependencies::print_statistics(); |
| if (xtty != NULL) xtty->tail("statistics"); |
| } |
| |
| #endif // !PRODUCT |
| |
| #if INCLUDE_JVMCI |
| void nmethod::clear_jvmci_installed_code() { |
| // write_ref_method_pre/post can only be safely called at a |
| // safepoint or while holding the CodeCache_lock |
| assert(CodeCache_lock->is_locked() || |
| SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); |
| if (_jvmci_installed_code != NULL) { |
| // This must be done carefully to maintain nmethod remembered sets properly |
| BarrierSet* bs = Universe::heap()->barrier_set(); |
| bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); |
| _jvmci_installed_code = NULL; |
| bs->write_ref_nmethod_post(&_jvmci_installed_code, this); |
| } |
| } |
| |
| void nmethod::maybe_invalidate_installed_code() { |
| assert(Patching_lock->is_locked() || |
| SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); |
| oop installed_code = jvmci_installed_code(); |
| if (installed_code != NULL) { |
| nmethod* nm = (nmethod*)InstalledCode::address(installed_code); |
| if (nm == NULL || nm != this) { |
| // The link has been broken or the InstalledCode instance is |
| // associated with another nmethod so do nothing. |
| return; |
| } |
| if (!is_alive()) { |
| // Break the link between nmethod and InstalledCode such that the nmethod |
| // can subsequently be flushed safely. The link must be maintained while |
| // the method could have live activations since invalidateInstalledCode |
| // might want to invalidate all existing activations. |
| InstalledCode::set_address(installed_code, 0); |
| InstalledCode::set_entryPoint(installed_code, 0); |
| } else if (is_not_entrant()) { |
| // Remove the entry point so any invocation will fail but keep |
| // the address link around that so that existing activations can |
| // be invalidated. |
| InstalledCode::set_entryPoint(installed_code, 0); |
| } |
| } |
| } |
| |
| void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { |
| if (installedCode() == NULL) { |
| THROW(vmSymbols::java_lang_NullPointerException()); |
| } |
| jlong nativeMethod = InstalledCode::address(installedCode); |
| nmethod* nm = (nmethod*)nativeMethod; |
| if (nm == NULL) { |
| // Nothing to do |
| return; |
| } |
| |
| nmethodLocker nml(nm); |
| #ifdef ASSERT |
| { |
| MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
| // This relationship can only be checked safely under a lock |
| assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); |
| } |
| #endif |
| |
| if (nm->is_alive()) { |
| // The nmethod state machinery maintains the link between the |
| // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be |
| // alive assume there is work to do and deoptimize the nmethod. |
| nm->mark_for_deoptimization(); |
| VM_Deoptimize op; |
| VMThread::execute(&op); |
| } |
| |
| MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
| // Check that it's still associated with the same nmethod and break |
| // the link if it is. |
| if (InstalledCode::address(installedCode) == nativeMethod) { |
| InstalledCode::set_address(installedCode, 0); |
| } |
| } |
| |
| char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { |
| if (!this->is_compiled_by_jvmci()) { |
| return NULL; |
| } |
| oop installedCode = this->jvmci_installed_code(); |
| if (installedCode != NULL) { |
| oop installedCodeName = NULL; |
| if (installedCode->is_a(InstalledCode::klass())) { |
| installedCodeName = InstalledCode::name(installedCode); |
| } |
| if (installedCodeName != NULL) { |
| return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); |
| } else { |
| jio_snprintf(buf, buflen, "null"); |
| return buf; |
| } |
| } |
| jio_snprintf(buf, buflen, "noInstalledCode"); |
| return buf; |
| } |
| #endif |