diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/code/nmethod.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/hotspot/share/code/nmethod.cpp Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,2997 @@ +/* + * 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* 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* 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 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* 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(""); + 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(""); + } + 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