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