--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/code/nmethod.cpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,2216 @@
+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+# include "incls/_precompiled.incl"
+# include "incls/_nmethod.cpp.incl"
+
+#ifdef DTRACE_ENABLED
+
+
+// Only bother with this argument setup if dtrace is available
+
+HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
+ const char*, int, const char*, int, const char*, int, void*, size_t);
+
+HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
+ char*, int, char*, int, char*, int);
+
+#define DTRACE_METHOD_UNLOAD_PROBE(method) \
+ { \
+ methodOop m = (method); \
+ if (m != NULL) { \
+ symbolOop klass_name = m->klass_name(); \
+ symbolOop name = m->name(); \
+ symbolOop signature = m->signature(); \
+ HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \
+ klass_name->bytes(), klass_name->utf8_length(), \
+ name->bytes(), name->utf8_length(), \
+ signature->bytes(), signature->utf8_length()); \
+ } \
+ }
+
+#else // ndef DTRACE_ENABLED
+
+#define DTRACE_METHOD_UNLOAD_PROBE(method)
+
+#endif
+
+bool nmethod::is_compiled_by_c1() const {
+ if (is_native_method()) return false;
+ assert(compiler() != NULL, "must be");
+ return compiler()->is_c1();
+}
+bool nmethod::is_compiled_by_c2() const {
+ if (is_native_method()) return false;
+ assert(compiler() != NULL, "must be");
+ return compiler()->is_c2();
+}
+
+
+
+//---------------------------------------------------------------------------------
+// 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.
+static
+struct nmethod_stats_struct {
+ int nmethod_count;
+ int total_size;
+ int relocation_size;
+ int code_size;
+ int stub_size;
+ int consts_size;
+ int scopes_data_size;
+ int scopes_pcs_size;
+ int dependencies_size;
+ int handler_table_size;
+ int nul_chk_table_size;
+ int oops_size;
+
+ void note_nmethod(nmethod* nm) {
+ nmethod_count += 1;
+ total_size += nm->size();
+ relocation_size += nm->relocation_size();
+ code_size += nm->code_size();
+ stub_size += nm->stub_size();
+ consts_size += nm->consts_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();
+ oops_size += nm->oops_size();
+ }
+ void print_nmethod_stats() {
+ if (nmethod_count == 0) return;
+ tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
+ if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
+ if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
+ if (code_size != 0) tty->print_cr(" main code = %d", code_size);
+ if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
+ if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
+ if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
+ if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
+ if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
+ if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
+ if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
+ if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
+ }
+
+ int native_nmethod_count;
+ int native_total_size;
+ int native_relocation_size;
+ int native_code_size;
+ int native_oops_size;
+ void note_native_nmethod(nmethod* nm) {
+ native_nmethod_count += 1;
+ native_total_size += nm->size();
+ native_relocation_size += nm->relocation_size();
+ native_code_size += nm->code_size();
+ native_oops_size += nm->oops_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_code_size != 0) tty->print_cr(" N. main code = %d", native_code_size);
+ if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
+ }
+
+ 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 _last_pc_desc 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);
+ }
+} nmethod_stats;
+#endif //PRODUCT
+
+//---------------------------------------------------------------------------------
+
+
+// The _unwind_handler is a special marker address, which says that
+// for given exception oop and address, the frame should be removed
+// as the tuple cannot be caught in the nmethod
+address ExceptionCache::_unwind_handler = (address) -1;
+
+
+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) {
+ for (int i=0; i<count(); 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;
+ if (count() < cache_size) {
+ set_pc_at(count(),addr);
+ set_handler_at(count(), handler);
+ increment_count();
+ return true;
+ }
+ return false;
+}
+
+
+// private method for handling exception cache
+// These methods are private, and used to manipulate the exception cache
+// directly.
+ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
+ ExceptionCache* ec = exception_cache();
+ while (ec != NULL) {
+ if (ec->match_exception_with_space(exception)) {
+ return ec;
+ }
+ ec = ec->next();
+ }
+ return NULL;
+}
+
+
+//-----------------------------------------------------------------------------
+
+
+// Helper used by both find_pc_desc methods.
+static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
+ NOT_PRODUCT(++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) {
+ _last_pc_desc = NULL; // native method
+ return;
+ }
+ NOT_PRODUCT(++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");
+ _last_pc_desc = initial_pc_desc + 1; // first valid one is after 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(++nmethod_stats.pc_desc_queries);
+ NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);
+
+ // 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 returned value.
+ res = _last_pc_desc;
+ if (res == NULL) return NULL; // native method; no PcDescs at all
+ if (match_desc(res, pc_offset, approximate)) {
+ NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
+ return res;
+ }
+
+ // Step two: Check the LRU cache.
+ for (int i = 0; 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(++nmethod_stats.pc_desc_hits);
+ _last_pc_desc = res; // record this cache hit in case of repeat
+ return res;
+ }
+ }
+
+ // Report failure.
+ return NULL;
+}
+
+void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
+ NOT_PRODUCT(++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;
+ }
+ // Note: Do not update _last_pc_desc. It fronts for the LRU cache.
+}
+
+// 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 = round_to(pcs_size, oopSize);
+ if ((nsize % sizeof(PcDesc)) != 0) {
+ nsize = pcs_size + sizeof(PcDesc);
+ }
+ assert((nsize % oopSize) == 0, "correct alignment");
+ return nsize;
+}
+
+//-----------------------------------------------------------------------------
+
+
+void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
+ assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
+ assert(new_entry != NULL,"Must be non null");
+ assert(new_entry->next() == NULL, "Must be null");
+
+ if (exception_cache() != NULL) {
+ new_entry->set_next(exception_cache());
+ }
+ set_exception_cache(new_entry);
+}
+
+void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
+ ExceptionCache* prev = NULL;
+ ExceptionCache* curr = exception_cache();
+ assert(curr != NULL, "nothing to remove");
+ // find the previous and next entry of ec
+ while (curr != ec) {
+ prev = curr;
+ curr = curr->next();
+ assert(curr != NULL, "ExceptionCache not found");
+ }
+ // now: curr == ec
+ ExceptionCache* next = curr->next();
+ if (prev == NULL) {
+ set_exception_cache(next);
+ } else {
+ prev->set_next(next);
+ }
+ delete curr;
+}
+
+
+// public method for accessing the exception cache
+// These are the public access methods.
+address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
+ // We never grab a lock to read the exception cache, so we may
+ // have false negatives. This is okay, as it can only happen during
+ // the first few exception lookups for a given nmethod.
+ ExceptionCache* ec = exception_cache();
+ while (ec != NULL) {
+ address ret_val;
+ if ((ret_val = ec->match(exception,pc)) != NULL) {
+ return ret_val;
+ }
+ ec = ec->next();
+ }
+ return NULL;
+}
+
+
+void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
+ // There are potential race conditions during exception cache updates, so we
+ // must own the ExceptionCache_lock before doing ANY modifications. Because
+ // we dont lock during reads, it is possible to have several threads attempt
+ // to update the cache with the same data. We need to check for already inserted
+ // copies of the current data before adding it.
+
+ MutexLocker ml(ExceptionCache_lock);
+ ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
+
+ if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
+ target_entry = new ExceptionCache(exception,pc,handler);
+ add_exception_cache_entry(target_entry);
+ }
+}
+
+
+//-------------end of code for ExceptionCache--------------
+
+
+void nmFlags::clear() {
+ assert(sizeof(nmFlags) == sizeof(int), "using more than one word for nmFlags");
+ *(jint*)this = 0;
+}
+
+int nmethod::total_size() const {
+ return
+ code_size() +
+ stub_size() +
+ consts_size() +
+ scopes_data_size() +
+ scopes_pcs_size() +
+ handler_table_size() +
+ nul_chk_table_size();
+}
+
+const char* nmethod::compile_kind() const {
+ if (method() == NULL) return "unloaded";
+ if (is_native_method()) return "c2n";
+ if (is_osr_method()) return "osr";
+ return NULL;
+}
+
+// %%% This variable is no longer used?
+int nmethod::_zombie_instruction_size = NativeJump::instruction_size;
+
+
+nmethod* nmethod::new_native_nmethod(methodHandle method,
+ 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) {
+ // create nmethod
+ nmethod* nm = NULL;
+ {
+ MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
+ int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
+ const int dummy = -1; // Flag to force proper "operator new"
+ CodeOffsets offsets;
+ offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
+ offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
+ nm = new (native_nmethod_size)
+ nmethod(method(), native_nmethod_size, &offsets,
+ code_buffer, frame_size,
+ basic_lock_owner_sp_offset, basic_lock_sp_offset,
+ oop_maps);
+ NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm));
+ if (PrintAssembly && nm != NULL)
+ Disassembler::decode(nm);
+ }
+ // verify nmethod
+ debug_only(if (nm) nm->verify();) // might block
+
+ if (nm != NULL) {
+ nm->log_new_nmethod();
+ }
+
+ return nm;
+}
+
+nmethod* nmethod::new_nmethod(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
+)
+{
+ assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
+ // create nmethod
+ nmethod* nm = NULL;
+ { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
+ int nmethod_size =
+ allocation_size(code_buffer, sizeof(nmethod))
+ + adjust_pcs_size(debug_info->pcs_size())
+ + round_to(dependencies->size_in_bytes() , oopSize)
+ + round_to(handler_table->size_in_bytes(), oopSize)
+ + round_to(nul_chk_table->size_in_bytes(), oopSize)
+ + round_to(debug_info->data_size() , oopSize);
+ nm = new (nmethod_size)
+ nmethod(method(), 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 (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(); ) {
+ klassOop 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) nmethod_stats.note_nmethod(nm));
+ if (PrintAssembly && nm != NULL)
+ Disassembler::decode(nm);
+ }
+
+ // verify nmethod
+ debug_only(if (nm) nm->verify();) // might block
+
+ if (nm != NULL) {
+ nm->log_new_nmethod();
+ }
+
+ // done
+ return nm;
+}
+
+
+// For native wrappers
+nmethod::nmethod(
+ methodOop method,
+ int nmethod_size,
+ CodeOffsets* offsets,
+ CodeBuffer* code_buffer,
+ int frame_size,
+ ByteSize basic_lock_owner_sp_offset,
+ ByteSize basic_lock_sp_offset,
+ OopMapSet* oop_maps )
+ : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
+ nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
+ _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset),
+ _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset)
+{
+ {
+ debug_only(No_Safepoint_Verifier nsv;)
+ assert_locked_or_safepoint(CodeCache_lock);
+
+ NOT_PRODUCT(_has_debug_info = false; )
+ _method = method;
+ _entry_bci = InvocationEntryBci;
+ _link = NULL;
+ _compiler = NULL;
+ // 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;
+ _deoptimize_offset = 0;
+ _orig_pc_offset = 0;
+ _stub_offset = data_offset();
+ _consts_offset = data_offset();
+ _scopes_data_offset = data_offset();
+ _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 = 0; // default
+ _comp_level = CompLevel_none;
+ _entry_point = instructions_begin();
+ _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
+ _osr_entry_point = NULL;
+ _exception_cache = NULL;
+ _pc_desc_cache.reset_to(NULL);
+
+ flags.clear();
+ flags.state = alive;
+ _markedForDeoptimization = 0;
+
+ _lock_count = 0;
+ _stack_traversal_mark = 0;
+
+ code_buffer->copy_oops_to(this);
+ debug_only(check_store();)
+ CodeCache::commit(this);
+ VTune::create_nmethod(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();
+ oop_maps->print();
+ }
+ if (PrintRelocations) {
+ print_relocations();
+ }
+ if (xtty != NULL) {
+ xtty->tail("print_native_nmethod");
+ }
+ }
+ Events::log("Create nmethod " INTPTR_FORMAT, this);
+}
+
+
+void* nmethod::operator new(size_t size, int nmethod_size) {
+ // Always leave some room in the CodeCache for I2C/C2I adapters
+ if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL;
+ return CodeCache::allocate(nmethod_size);
+}
+
+
+nmethod::nmethod(
+ methodOop method,
+ 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
+ )
+ : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
+ nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
+ _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
+ _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1))
+{
+ assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
+ {
+ debug_only(No_Safepoint_Verifier nsv;)
+ assert_locked_or_safepoint(CodeCache_lock);
+
+ NOT_PRODUCT(_has_debug_info = false; )
+ _method = method;
+ _compile_id = compile_id;
+ _comp_level = comp_level;
+ _entry_bci = entry_bci;
+ _link = NULL;
+ _compiler = compiler;
+ _orig_pc_offset = orig_pc_offset;
+ _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start());
+
+ // Exception handler and deopt handler are in the stub section
+ _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
+ _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
+ _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start());
+ _scopes_data_offset = data_offset();
+ _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize);
+ _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
+ _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize);
+ _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
+ _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);
+
+ _entry_point = instructions_begin();
+ _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
+ _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry);
+ _exception_cache = NULL;
+ _pc_desc_cache.reset_to(scopes_pcs_begin());
+
+ flags.clear();
+ flags.state = alive;
+ _markedForDeoptimization = 0;
+
+ _unload_reported = false; // jvmti state
+
+ _lock_count = 0;
+ _stack_traversal_mark = 0;
+
+ // Copy contents of ScopeDescRecorder to nmethod
+ code_buffer->copy_oops_to(this);
+ debug_info->copy_to(this);
+ dependencies->copy_to(this);
+ debug_only(check_store();)
+
+ CodeCache::commit(this);
+
+ VTune::create_nmethod(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() ||
+ _method->is_static() == (entry_point() == _verified_entry_point),
+ " entry points must be same for static methods and vice versa");
+ }
+
+ bool printnmethods = PrintNMethods || CompilerOracle::has_option_string(_method, "PrintNMethods");
+ if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
+ print_nmethod(printnmethods);
+ }
+
+ // Note: Do not verify in here as the CodeCache_lock is
+ // taken which would conflict with the CompiledIC_lock
+ // which taken during the verification of call sites.
+ // (was bug - gri 10/25/99)
+
+ Events::log("Create nmethod " INTPTR_FORMAT, this);
+}
+
+
+// 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);
+ if (compiler() != NULL) {
+ log->print(" compiler='%s'", compiler()->name());
+ }
+#ifdef TIERED
+ log->print(" level='%d'", comp_level());
+#endif // TIERED
+}
+
+
+#define LOG_OFFSET(log, name) \
+ if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
+ log->print(" " XSTR(name) "_offset='%d'" , \
+ (intptr_t)name##_begin() - (intptr_t)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'",
+ instructions_begin(), size());
+ xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
+
+ LOG_OFFSET(xtty, relocation);
+ LOG_OFFSET(xtty, code);
+ LOG_OFFSET(xtty, stub);
+ LOG_OFFSET(xtty, consts);
+ 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);
+
+ 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* title) const {
+ if (st != NULL) {
+ ttyLocker ttyl;
+ // Print a little tag line that looks like +PrintCompilation output:
+ st->print("%3d%c %s",
+ compile_id(),
+ is_osr_method() ? '%' :
+ method() != NULL &&
+ is_native_method() ? 'n' : ' ',
+ title);
+#ifdef TIERED
+ st->print(" (%d) ", comp_level());
+#endif // TIERED
+ if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
+ if (method() != NULL) {
+ method()->print_short_name(st);
+ if (is_osr_method())
+ st->print(" @ %d", osr_entry_bci());
+ if (method()->code_size() > 0)
+ st->print(" (%d bytes)", method()->code_size());
+ }
+ }
+}
+
+
+#ifndef PRODUCT
+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();
+ oop_maps()->print();
+ }
+ if (PrintDebugInfo) {
+ print_scopes();
+ }
+ if (PrintRelocations) {
+ print_relocations();
+ }
+ if (PrintDependencies) {
+ print_dependencies();
+ }
+ if (PrintExceptionHandlers) {
+ print_handler_table();
+ print_nul_chk_table();
+ }
+ if (xtty != NULL) {
+ xtty->tail("print_nmethod");
+ }
+}
+#endif
+
+
+void nmethod::set_version(int v) {
+ flags.version = v;
+}
+
+
+ScopeDesc* nmethod::scope_desc_at(address pc) {
+ PcDesc* pd = pc_desc_at(pc);
+ guarantee(pd != NULL, "scope must be present");
+ return new ScopeDesc(this, pd->scope_decode_offset(),
+ pd->obj_decode_offset());
+}
+
+
+void nmethod::clear_inline_caches() {
+ assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
+ if (is_zombie()) {
+ return;
+ }
+
+ RelocIterator iter(this);
+ while (iter.next()) {
+ iter.reloc()->clear_inline_cache();
+ }
+}
+
+
+void nmethod::cleanup_inline_caches() {
+
+ assert(SafepointSynchronize::is_at_safepoint() &&
+ !CompiledIC_lock->is_locked() &&
+ !Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs");
+
+ // 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??
+ }
+
+ // Find all calls in an nmethod, and clear the ones that points to zombie methods
+ 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.reloc());
+ // Ok, to lookup references to zombies here
+ CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
+ if( cb != NULL && cb->is_nmethod() ) {
+ nmethod* nm = (nmethod*)cb;
+ // Clean inline caches pointing to both zombie and not_entrant methods
+ if (!nm->is_in_use()) ic->set_to_clean();
+ }
+ break;
+ }
+ case relocInfo::static_call_type: {
+ CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
+ CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
+ if( cb != NULL && cb->is_nmethod() ) {
+ nmethod* nm = (nmethod*)cb;
+ // Clean inline caches pointing to both zombie and not_entrant methods
+ if (!nm->is_in_use()) csc->set_to_clean();
+ }
+ break;
+ }
+ }
+ }
+}
+
+void nmethod::mark_as_seen_on_stack() {
+ assert(is_not_entrant(), "must be a non-entrant method");
+ set_stack_traversal_mark(NMethodSweeper::traversal_count());
+}
+
+// Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
+bool nmethod::can_not_entrant_be_converted() {
+ assert(is_not_entrant(), "must be a non-entrant method");
+ assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint");
+
+ // 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();
+}
+
+void nmethod::inc_decompile_count() {
+ // Could be gated by ProfileTraps, but do not bother...
+ methodOop m = method();
+ if (m == NULL) return;
+ methodDataOop mdo = m->method_data();
+ if (mdo == NULL) return;
+ // There is a benign race here. See comments in methodDataOop.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
+ if (TraceClassUnloading && WizardMode) {
+ tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
+ " unloadable], methodOop(" INTPTR_FORMAT
+ "), cause(" INTPTR_FORMAT ")",
+ this, (address)_method, (address)cause);
+ cause->klass()->print();
+ }
+ // If _method is already NULL the methodOop is about to be unloaded,
+ // so we don't have to break the cycle. Note that it is possible to
+ // have the methodOop live here, in case we unload the nmethod because
+ // it is pointing to some oop (other than the methodOop) being unloaded.
+ if (_method != NULL) {
+ // OSR methods point to the methodOop, but the methodOop does not
+ // point back!
+ if (_method->code() == this) {
+ _method->clear_code(); // Break a cycle
+ }
+ inc_decompile_count(); // Last chance to make a mark on the MDO
+ _method = NULL; // Clear the method of this dead nmethod
+ }
+ // Make the class unloaded - i.e., change state and notify sweeper
+ check_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);
+ }
+ flags.state = unloaded;
+
+ // The methodOop is gone at this point
+ assert(_method == NULL, "Tautology");
+
+ set_link(NULL);
+ NMethodSweeper::notify(this);
+}
+
+void nmethod::invalidate_osr_method() {
+ assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
+ if (_entry_bci != InvalidOSREntryBci)
+ inc_decompile_count();
+ // Remove from list of active nmethods
+ if (method() != NULL)
+ instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this);
+ // Set entry as invalid
+ _entry_bci = InvalidOSREntryBci;
+}
+
+void nmethod::log_state_change(int state) const {
+ if (LogCompilation) {
+ if (xtty != NULL) {
+ ttyLocker ttyl; // keep the following output all in one block
+ xtty->begin_elem("make_not_entrant %sthread='" UINTX_FORMAT "'",
+ (state == zombie ? "zombie='1' " : ""),
+ os::current_thread_id());
+ log_identity(xtty);
+ xtty->stamp();
+ xtty->end_elem();
+ }
+ }
+ if (PrintCompilation) {
+ print_on(tty, state == zombie ? "made zombie " : "made not entrant ");
+ tty->cr();
+ }
+}
+
+// Common functionality for both make_not_entrant and make_zombie
+void nmethod::make_not_entrant_or_zombie(int state) {
+ assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
+
+ // Code for an on-stack-replacement nmethod is removed when a class gets unloaded.
+ // They never become zombie/non-entrant, so the nmethod sweeper will never remove
+ // them. Instead the entry_bci is set to InvalidOSREntryBci, so the osr nmethod
+ // will never be used anymore. That the nmethods only gets removed when class unloading
+ // happens, make life much simpler, since the nmethods are not just going to disappear
+ // out of the blue.
+ if (is_osr_only_method()) {
+ if (osr_entry_bci() != InvalidOSREntryBci) {
+ // only log this once
+ log_state_change(state);
+ }
+ invalidate_osr_method();
+ return;
+ }
+
+ // If the method is already zombie or set to the state we want, nothing to do
+ if (is_zombie() || (state == not_entrant && is_not_entrant())) {
+ return;
+ }
+
+ log_state_change(state);
+
+ // Make sure the nmethod is not flushed in case of a safepoint in code below.
+ nmethodLocker nml(this);
+
+ {
+ // Enter critical section. Does not block for safepoint.
+ MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
+ // The caller can be calling the method statically or through an inline
+ // cache call.
+ if (!is_not_entrant()) {
+ NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
+ SharedRuntime::get_handle_wrong_method_stub());
+ assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, "");
+ }
+
+ // 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) {
+ assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
+ flush_dependencies(NULL);
+ } else {
+ assert(state == not_entrant, "other cases may need to be handled differently");
+ }
+
+ // Change state
+ flags.state = state;
+ } // leave critical region under Patching_lock
+
+ if (state == not_entrant) {
+ Events::log("Make nmethod not entrant " INTPTR_FORMAT, this);
+ } else {
+ Events::log("Make nmethod zombie " INTPTR_FORMAT, this);
+ }
+
+ if (TraceCreateZombies) {
+ tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
+ }
+
+ // Make sweeper aware that there is a zombie method that needs to be removed
+ NMethodSweeper::notify(this);
+
+ // not_entrant only stuff
+ if (state == not_entrant) {
+ mark_as_seen_on_stack();
+ }
+
+ // It's a true state change, so mark the method as decompiled.
+ inc_decompile_count();
+
+
+ // 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 earilier if the GC marked it for unloading).
+ if (state == zombie) {
+
+ DTRACE_METHOD_UNLOAD_PROBE(method());
+
+ if (JvmtiExport::should_post_compiled_method_unload() &&
+ !unload_reported()) {
+ assert(method() != NULL, "checking");
+ {
+ HandleMark hm;
+ JvmtiExport::post_compiled_method_unload_at_safepoint(
+ method()->jmethod_id(), code_begin());
+ }
+ set_unload_reported();
+ }
+ }
+
+
+ // Zombie only stuff
+ if (state == zombie) {
+ VTune::delete_nmethod(this);
+ }
+
+ // Check whether method got unloaded at a safepoint before this,
+ // if so we can skip the flushing steps below
+ if (method() == NULL) return;
+
+ // 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 methodOop 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()->code() == this ||
+ method()->from_compiled_entry() == verified_entry_point()) {
+ HandleMark hm;
+ method()->clear_code();
+ }
+}
+
+
+#ifndef PRODUCT
+void nmethod::check_safepoint() {
+ assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
+}
+#endif
+
+
+void nmethod::flush() {
+ // Note that there are no valid oops in the nmethod anymore.
+ assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
+ assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");
+
+ assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
+ check_safepoint();
+
+ // completely deallocate this method
+ EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
+ if (PrintMethodFlushing) {
+ tty->print_cr("*flushing nmethod " INTPTR_FORMAT ". Live blobs: %d", this, CodeCache::nof_blobs());
+ }
+
+ // 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;
+ }
+
+ ((CodeBlob*)(this))->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(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
+ 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(); ) {
+ klassOop 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 || is_alive->do_object_b(klass)) {
+ instanceKlass::cast(klass)->remove_dependent_nmethod(this);
+ }
+ }
+ }
+}
+
+
+// If this oop is not live, the nmethod can be unloaded.
+bool nmethod::can_unload(BoolObjectClosure* is_alive,
+ OopClosure* keep_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 (obj->is_compiledICHolder()) {
+ compiledICHolderOop cichk_oop = compiledICHolderOop(obj);
+ if (is_alive->do_object_b(
+ cichk_oop->holder_method()->method_holder()) &&
+ is_alive->do_object_b(cichk_oop->holder_klass())) {
+ // The oop should be kept alive
+ keep_alive->do_oop(root);
+ return false;
+ }
+ }
+ if (!UseParallelOldGC || !VerifyParallelOldWithMarkSweep) {
+ // Cannot do this test if verification of the UseParallelOldGC
+ // code using the PSMarkSweep code is being done.
+ assert(unloading_occurred, "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() {
+
+ methodOop moop = method();
+ HS_DTRACE_PROBE8(hotspot, compiled__method__load,
+ moop->klass_name()->bytes(),
+ moop->klass_name()->utf8_length(),
+ moop->name()->bytes(),
+ moop->name()->utf8_length(),
+ moop->signature()->bytes(),
+ moop->signature()->utf8_length(),
+ code_begin(), code_size());
+
+ if (JvmtiExport::should_post_compiled_method_load()) {
+ JvmtiExport::post_compiled_method_load(this);
+ }
+}
+
+void nmethod::post_compiled_method_unload() {
+ 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 methodOop will not be valid at that point.
+ if (JvmtiExport::should_post_compiled_method_unload()) {
+ assert(!unload_reported(), "already unloaded");
+ HandleMark hm;
+ JvmtiExport::post_compiled_method_unload_at_safepoint(
+ method()->jmethod_id(), code_begin());
+ }
+
+ // 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();
+}
+
+// This is called at the end of the strong tracing/marking phase of a
+// GC to unload an nmethod if it contains otherwise unreachable
+// oops.
+
+void nmethod::do_unloading(BoolObjectClosure* is_alive,
+ OopClosure* keep_alive, bool unloading_occurred) {
+ // Make sure the oop's ready to receive visitors
+ assert(!is_zombie() && !is_unloaded(),
+ "should not call follow on zombie or unloaded nmethod");
+
+ // If the method is not entrant 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.)
+ }
+
+ // The RedefineClasses() API can cause the class unloading invariant
+ // to no longer be true. See jvmtiExport.hpp for details.
+ // Also, leave a debugging breadcrumb in local flag.
+ bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
+ if (a_class_was_redefined) {
+ // This set of the unloading_occurred flag is done before the
+ // call to post_compiled_method_unload() so that the unloading
+ // of this nmethod is reported.
+ unloading_occurred = true;
+ }
+
+ // Follow methodOop
+ if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) {
+ return;
+ }
+
+ // Exception cache
+ ExceptionCache* ec = exception_cache();
+ while (ec != NULL) {
+ oop* ex_addr = (oop*)ec->exception_type_addr();
+ oop ex = *ex_addr;
+ ExceptionCache* next_ec = ec->next();
+ if (ex != NULL && !is_alive->do_object_b(ex)) {
+ assert(!ex->is_compiledICHolder(), "Possible error here");
+ remove_from_exception_cache(ec);
+ }
+ ec = next_ec;
+ }
+
+ // If class unloading occurred we first iterate over all inline caches and
+ // clear ICs where the cached oop is referring to an unloaded klass or method.
+ // The remaining live cached oops will be traversed in the relocInfo::oop_type
+ // iteration below.
+ if (unloading_occurred) {
+ RelocIterator iter(this, low_boundary);
+ while(iter.next()) {
+ if (iter.type() == relocInfo::virtual_call_type) {
+ CompiledIC *ic = CompiledIC_at(iter.reloc());
+ oop ic_oop = ic->cached_oop();
+ if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) {
+ // The only exception is compiledICHolder oops which may
+ // yet be marked below. (We check this further below).
+ if (ic_oop->is_compiledICHolder()) {
+ compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop);
+ if (is_alive->do_object_b(
+ cichk_oop->holder_method()->method_holder()) &&
+ is_alive->do_object_b(cichk_oop->holder_klass())) {
+ continue;
+ }
+ }
+ ic->set_to_clean();
+ assert(ic->cached_oop() == NULL, "cached oop in IC should be cleared")
+ }
+ }
+ }
+ }
+
+ // Compiled code
+ 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 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) {
+ if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) {
+ return;
+ }
+ }
+ }
+ }
+
+
+ // 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, keep_alive, p, unloading_occurred)) {
+ return;
+ }
+ }
+
+#ifndef PRODUCT
+ // This nmethod was not unloaded; check below that all CompiledICs
+ // refer to marked oops.
+ {
+ RelocIterator iter(this, low_boundary);
+ while (iter.next()) {
+ if (iter.type() == relocInfo::virtual_call_type) {
+ CompiledIC *ic = CompiledIC_at(iter.reloc());
+ oop ic_oop = ic->cached_oop();
+ assert(ic_oop == NULL || is_alive->do_object_b(ic_oop),
+ "Found unmarked ic_oop in reachable nmethod");
+ }
+ }
+ }
+#endif // !PRODUCT
+}
+
+void nmethod::oops_do(OopClosure* f) {
+ // make sure the oops ready to receive visitors
+ assert(!is_zombie() && !is_unloaded(),
+ "should not call follow on zombie or 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.)
+ }
+
+ // Compiled code
+ f->do_oop((oop*) &_method);
+ ExceptionCache* ec = exception_cache();
+ while(ec != NULL) {
+ f->do_oop((oop*)ec->exception_type_addr());
+ ec = ec->next();
+ }
+
+ 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
+ for (oop* p = oops_begin(); p < oops_end(); p++) {
+ if (*p == Universe::non_oop_word()) continue; // skip non-oops
+ f->do_oop(p);
+ }
+}
+
+// Method that knows how to preserve outgoing arguments at call. This method must be
+// called with a frame corresponding to a Java invoke
+void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
+ if (!method()->is_native()) {
+ SimpleScopeDesc ssd(this, fr.pc());
+ Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci());
+ bool is_static = call->is_invokestatic();
+ symbolOop signature = call->signature();
+ fr.oops_compiled_arguments_do(signature, is_static, reg_map, f);
+ }
+}
+
+
+oop nmethod::embeddedOop_at(u_char* p) {
+ RelocIterator iter(this, p, p + oopSize);
+ while (iter.next())
+ if (iter.type() == relocInfo::oop_type) {
+ return iter.oop_reloc()->oop_value();
+ }
+ return NULL;
+}
+
+
+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
+
+ 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(instructions_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(nmethod* nm, int pc_offset, bool approximate) {
+ PcDesc* lower = nm->scopes_pcs_begin();
+ PcDesc* upper = nm->scopes_pcs_end();
+ lower += 1; // exclude initial sentinel
+ PcDesc* res = NULL;
+ for (PcDesc* p = lower; p < upper; p++) {
+ NOT_PRODUCT(--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* nmethod::find_pc_desc_internal(address pc, bool approximate) {
+ address base_address = instructions_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(this, 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 = scopes_pcs_begin();
+ PcDesc* upper = 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(++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(++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(++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(this, pc_offset, approximate), "search ok");
+ _pc_desc_cache.add_pc_desc(upper);
+ return upper;
+ } else {
+ assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
+ return NULL;
+ }
+}
+
+
+bool nmethod::check_all_dependencies() {
+ bool found_check = false;
+ // wholesale check of all dependencies
+ for (Dependencies::DepStream deps(this); deps.next(); ) {
+ if (deps.check_dependency() != NULL) {
+ found_check = true;
+ NOT_DEBUG(break);
+ }
+ }
+ return found_check; // tell caller if we found anything
+}
+
+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(klassOop dependee) {
+ instanceKlass *dependee_ik = instanceKlass::cast(dependee);
+ objArrayOop dependee_methods = dependee_ik->methods();
+ for (Dependencies::DepStream deps(this); deps.next(); ) {
+ if (deps.type() == Dependencies::evol_method) {
+ methodOop method = deps.method_argument(0);
+ for (int j = 0; j < dependee_methods->length(); j++) {
+ if ((methodOop) dependee_methods->obj_at(j) == method) {
+ // RC_TRACE macro has an embedded ResourceMark
+ RC_TRACE(0x01000000,
+ ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
+ _method->method_holder()->klass_part()->external_name(),
+ _method->name()->as_C_string(),
+ _method->signature()->as_C_string(), compile_id(),
+ method->method_holder()->klass_part()->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(methodOop dependee) {
+ for (Dependencies::DepStream deps(this); deps.next(); ) {
+ if (deps.type() != Dependencies::evol_method)
+ continue;
+ methodOop method = deps.method_argument(0);
+ if (method == dependee) return true;
+ }
+ return false;
+}
+
+
+bool nmethod::is_patchable_at(address instr_addr) {
+ assert (code_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 - instructions_begin();
+ int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
+#ifdef ASSERT
+ if (cont_offset == 0) {
+ Thread* thread = ThreadLocalStorage::get_thread_slow();
+ 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, "");
+ tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
+ print();
+ method()->print_codes();
+ print_code();
+ print_pcs();
+ }
+#endif
+ guarantee(cont_offset != 0, "unhandled implicit exception in compiled code");
+ return instructions_begin() + cont_offset;
+}
+
+
+
+void nmethod_init() {
+ // make sure you didn't forget to adjust the filler fields
+ assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word");
+ 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_nmethod(), "bad pc for a nmethod found");
+ _nm = (nmethod*)cb;
+ lock_nmethod(_nm);
+}
+
+void nmethodLocker::lock_nmethod(nmethod* nm) {
+ if (nm == NULL) return;
+ Atomic::inc(&nm->_lock_count);
+ guarantee(!nm->is_zombie(), "cannot lock a zombie method");
+}
+
+void nmethodLocker::unlock_nmethod(nmethod* nm) {
+ if (nm == NULL) return;
+ Atomic::dec(&nm->_lock_count);
+ guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
+}
+
+bool nmethod::is_deopt_pc(address pc) {
+ bool ret = pc == deopt_handler_begin();
+ return ret;
+}
+
+
+// -----------------------------------------------------------------------------
+// Verification
+
+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() )
+ return;
+
+ // Make sure all the entry points are correctly aligned for patching.
+ NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
+
+ assert(method()->is_oop(), "must be valid");
+
+ ResourceMark rm;
+
+ if (!CodeCache::contains(this)) {
+ fatal1("nmethod at " INTPTR_FORMAT " not in zone", this);
+ }
+
+ if(is_native_method() )
+ return;
+
+ nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
+ if (nm != this) {
+ fatal1("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 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)", this);
+ }
+ }
+
+ verify_scopes();
+}
+
+
+void nmethod::verify_interrupt_point(address call_site) {
+ // This code does not work in release mode since
+ // owns_lock only is available in debug mode.
+ CompiledIC* ic = NULL;
+ Thread *cur = Thread::current();
+ if (CompiledIC_lock->owner() == cur ||
+ ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
+ SafepointSynchronize::is_at_safepoint())) {
+ ic = CompiledIC_at(call_site);
+ CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
+ } else {
+ MutexLocker ml_verify (CompiledIC_lock);
+ ic = CompiledIC_at(call_site);
+ }
+ PcDesc* pd = pc_desc_at(ic->end_of_call());
+ assert(pd != NULL, "PcDesc must exist");
+ for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
+ pd->obj_decode_offset());
+ !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();
+ verify_interrupt_point(iter.addr());
+ break;
+ case relocInfo::static_call_type:
+ stub = iter.static_call_reloc()->static_stub();
+ //verify_interrupt_point(iter.addr());
+ break;
+ case relocInfo::runtime_call_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;
+ }
+ assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
+ }
+}
+
+
+// -----------------------------------------------------------------------------
+// Non-product code
+#ifndef PRODUCT
+
+void nmethod::check_store() {
+ // Make sure all oops in the compiled code are tenured
+
+ RelocIterator iter(this);
+ while (iter.next()) {
+ if (iter.type() == relocInfo::oop_type) {
+ oop_Relocation* reloc = iter.oop_reloc();
+ oop obj = reloc->oop_value();
+ if (obj != NULL && !obj->is_perm()) {
+ fatal("must be permanent oop in compiled code");
+ }
+ }
+ }
+}
+
+
+// Printing operations
+
+void nmethod::print() const {
+ ResourceMark rm;
+ ttyLocker ttyl; // keep the following output all in one block
+
+ tty->print("Compiled ");
+
+ if (is_compiled_by_c1()) {
+ tty->print("(c1) ");
+ } else if (is_compiled_by_c2()) {
+ tty->print("(c2) ");
+ } else {
+ assert(is_native_method(), "Who else?");
+ tty->print("(nm) ");
+ }
+
+ print_on(tty, "nmethod");
+ tty->cr();
+ if (WizardMode) {
+ tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
+ tty->print(" for method " INTPTR_FORMAT , (address)method());
+ tty->print(" { ");
+ if (version()) tty->print("v%d ", version());
+ if (level()) tty->print("l%d ", level());
+ if (is_in_use()) tty->print("in_use ");
+ if (is_not_entrant()) tty->print("not_entrant ");
+ if (is_zombie()) tty->print("zombie ");
+ if (is_unloaded()) tty->print("unloaded ");
+ tty->print_cr("}:");
+ }
+ if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ (address)this,
+ (address)this + size(),
+ size());
+ if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ relocation_begin(),
+ relocation_end(),
+ relocation_size());
+ if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ code_begin(),
+ code_end(),
+ code_size());
+ if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ stub_begin(),
+ stub_end(),
+ stub_size());
+ if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ consts_begin(),
+ consts_end(),
+ consts_size());
+ if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ scopes_data_begin(),
+ scopes_data_end(),
+ scopes_data_size());
+ if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ scopes_pcs_begin(),
+ scopes_pcs_end(),
+ scopes_pcs_size());
+ if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ dependencies_begin(),
+ dependencies_end(),
+ dependencies_size());
+ if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ handler_table_begin(),
+ handler_table_end(),
+ handler_table_size());
+ if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ nul_chk_table_begin(),
+ nul_chk_table_end(),
+ nul_chk_table_size());
+ if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+ oops_begin(),
+ oops_end(),
+ oops_size());
+}
+
+
+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));
+ sd->print_on(tty, p);
+ }
+}
+
+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();
+ klassOop ctxk = deps.context_type();
+ if (ctxk != NULL) {
+ Klass* k = Klass::cast(ctxk);
+ if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) {
+ tty->print(" [nmethod<=klass]%s", k->external_name());
+ }
+ }
+ deps.log_dependency(); // put it into the xml log also
+ }
+}
+
+
+void nmethod::print_code() {
+ HandleMark hm;
+ ResourceMark m;
+ Disassembler().decode(this);
+}
+
+
+void nmethod::print_relocations() {
+ ResourceMark m; // in case methods get printed via the debugger
+ tty->print_cr("relocations:");
+ RelocIterator iter(this);
+ iter.print();
+ if (UseRelocIndex) {
+ jint* index_end = (jint*)relocation_end() - 1;
+ jint index_size = *index_end;
+ jint* index_start = (jint*)( (address)index_end - index_size );
+ tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
+ if (index_size > 0) {
+ jint* ip;
+ for (ip = index_start; ip+2 <= index_end; ip += 2)
+ tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
+ ip[0],
+ ip[1],
+ header_end()+ip[0],
+ relocation_begin()-1+ip[1]);
+ for (; ip < index_end; ip++)
+ tty->print_cr(" (%d ?)", ip[0]);
+ tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++);
+ tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
+ }
+ }
+}
+
+
+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);
+ }
+}
+
+
+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::virtual_call_type: return "virtual_call";
+ case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
+ case relocInfo::static_call_type: return "static_call";
+ case relocInfo::static_stub_type: return "static_stub";
+ case relocInfo::runtime_call_type: return "runtime_call";
+ 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";
+ }
+ }
+ 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());
+ }
+ return NULL;
+}
+
+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 = instructions_begin();
+ OopMapSet* oms = oop_maps();
+ if (oms != NULL) {
+ for (int i = 0, imax = oms->size(); i < imax; i++) {
+ OopMap* om = oms->at(i);
+ address pc = base + om->offset();
+ if (pc > begin) {
+ if (pc <= end) {
+ st->fill_to(column);
+ if (st == tty) {
+ st->print("; OopMap ");
+ om->print();
+ tty->cr();
+ } else {
+ st->print_cr("; OopMap #%d offset:%d", i, om->offset());
+ }
+ }
+ break;
+ }
+ }
+ }
+ ScopeDesc* sd = scope_desc_in(begin, end);
+ if (sd != NULL) {
+ st->fill_to(column);
+ if (sd->bci() == SynchronizationEntryBCI) {
+ st->print(";*synchronization entry");
+ } else {
+ if (sd->method().is_null()) {
+ tty->print("method is NULL");
+ } else if (sd->method()->is_native()) {
+ tty->print("method is native");
+ } else {
+ address bcp = sd->method()->bcp_from(sd->bci());
+ Bytecodes::Code bc = Bytecodes::java_code_at(bcp);
+ st->print(";*%s", Bytecodes::name(bc));
+ switch (bc) {
+ case Bytecodes::_invokevirtual:
+ case Bytecodes::_invokespecial:
+ case Bytecodes::_invokestatic:
+ case Bytecodes::_invokeinterface:
+ {
+ Bytecode_invoke* invoke = Bytecode_invoke_at(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:
+ {
+ methodHandle sdm = sd->method();
+ Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci()));
+ constantPoolOop sdmc = sdm->constants();
+ symbolOop name = sdmc->name_ref_at(field->index());
+ st->print(" ");
+ if (name != NULL)
+ name->print_symbol_on(st);
+ else
+ st->print("<UNKNOWN>");
+ }
+ }
+ }
+ }
+ st->cr();
+ // Print all scopes
+ for (;sd != NULL; sd = sd->sender()) {
+ st->fill_to(column);
+ st->print("; -");
+ if (sd->method().is_null()) {
+ tty->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->fill_to(column);
+ st->print("; {%s}", str);
+ }
+ int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin());
+ if (cont_offset != 0) {
+ st->fill_to(column);
+ st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset);
+ }
+
+}
+
+void nmethod::print_value_on(outputStream* st) const {
+ print_on(st, "nmethod");
+}
+
+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.reloc())->print();
+ break;
+ }
+ case relocInfo::static_call_type:
+ st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
+ compiledStaticCall_at(iter.reloc())->print();
+ break;
+ }
+ }
+}
+
+void nmethod::print_handler_table() {
+ ExceptionHandlerTable(this).print();
+}
+
+void nmethod::print_nul_chk_table() {
+ ImplicitExceptionTable(this).print(instructions_begin());
+}
+
+void nmethod::print_statistics() {
+ ttyLocker ttyl;
+ if (xtty != NULL) xtty->head("statistics type='nmethod'");
+ nmethod_stats.print_native_nmethod_stats();
+ nmethod_stats.print_nmethod_stats();
+ DebugInformationRecorder::print_statistics();
+ nmethod_stats.print_pc_stats();
+ Dependencies::print_statistics();
+ if (xtty != NULL) xtty->tail("statistics");
+}
+
+#endif // PRODUCT