| /* |
| * Copyright (c) 2015, 2018, 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/compiledIC.hpp" |
| #include "code/compiledMethod.inline.hpp" |
| #include "code/scopeDesc.hpp" |
| #include "code/codeCache.hpp" |
| #include "interpreter/bytecode.inline.hpp" |
| #include "logging/log.hpp" |
| #include "logging/logTag.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/methodData.hpp" |
| #include "oops/method.inline.hpp" |
| #include "prims/methodHandles.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "runtime/mutexLocker.hpp" |
| |
| CompiledMethod::CompiledMethod(Method* method, const char* name, CompilerType type, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments) |
| : CodeBlob(name, type, layout, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments), |
| _method(method), _mark_for_deoptimization_status(not_marked) { |
| init_defaults(); |
| } |
| |
| CompiledMethod::CompiledMethod(Method* method, const char* name, CompilerType type, int size, int header_size, CodeBuffer* cb, int frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments) |
| : CodeBlob(name, type, CodeBlobLayout((address) this, size, header_size, cb), cb, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments), |
| _method(method), _mark_for_deoptimization_status(not_marked) { |
| init_defaults(); |
| } |
| |
| void CompiledMethod::init_defaults() { |
| { // avoid uninitialized fields, even for short time periods |
| _is_far_code = false; |
| _scopes_data_begin = NULL; |
| _deopt_handler_begin = NULL; |
| _deopt_mh_handler_begin = NULL; |
| _exception_cache = NULL; |
| } |
| _has_unsafe_access = 0; |
| _has_method_handle_invokes = 0; |
| _lazy_critical_native = 0; |
| _has_wide_vectors = 0; |
| _unloading_clock = 0; |
| } |
| |
| bool CompiledMethod::is_method_handle_return(address return_pc) { |
| if (!has_method_handle_invokes()) return false; |
| PcDesc* pd = pc_desc_at(return_pc); |
| if (pd == NULL) |
| return false; |
| return pd->is_method_handle_invoke(); |
| } |
| |
| // Returns a string version of the method state. |
| const char* CompiledMethod::state() const { |
| int state = get_state(); |
| switch (state) { |
| case not_installed: |
| return "not installed"; |
| case in_use: |
| return "in use"; |
| case not_used: |
| return "not_used"; |
| case not_entrant: |
| return "not_entrant"; |
| case zombie: |
| return "zombie"; |
| case unloaded: |
| return "unloaded"; |
| default: |
| fatal("unexpected method state: %d", state); |
| return NULL; |
| } |
| } |
| |
| //----------------------------------------------------------------------------- |
| |
| void CompiledMethod::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"); |
| |
| ExceptionCache *ec = exception_cache(); |
| if (ec != NULL) { |
| new_entry->set_next(ec); |
| } |
| release_set_exception_cache(new_entry); |
| } |
| |
| void CompiledMethod::clean_exception_cache() { |
| ExceptionCache* prev = NULL; |
| ExceptionCache* curr = exception_cache(); |
| |
| while (curr != NULL) { |
| ExceptionCache* next = curr->next(); |
| |
| Klass* ex_klass = curr->exception_type(); |
| if (ex_klass != NULL && !ex_klass->is_loader_alive()) { |
| if (prev == NULL) { |
| set_exception_cache(next); |
| } else { |
| prev->set_next(next); |
| } |
| delete curr; |
| // prev stays the same. |
| } else { |
| prev = curr; |
| } |
| |
| curr = next; |
| } |
| } |
| |
| // public method for accessing the exception cache |
| // These are the public access methods. |
| address CompiledMethod::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 CompiledMethod::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 don't 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-------------- |
| |
| // private method for handling exception cache |
| // These methods are private, and used to manipulate the exception cache |
| // directly. |
| ExceptionCache* CompiledMethod::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; |
| } |
| |
| bool CompiledMethod::is_at_poll_return(address pc) { |
| RelocIterator iter(this, pc, pc+1); |
| while (iter.next()) { |
| if (iter.type() == relocInfo::poll_return_type) |
| return true; |
| } |
| return false; |
| } |
| |
| |
| bool CompiledMethod::is_at_poll_or_poll_return(address pc) { |
| RelocIterator iter(this, pc, pc+1); |
| while (iter.next()) { |
| relocInfo::relocType t = iter.type(); |
| if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) |
| return true; |
| } |
| return false; |
| } |
| |
| void CompiledMethod::verify_oop_relocations() { |
| // Ensure sure that the code matches the current oop values |
| RelocIterator iter(this, NULL, NULL); |
| while (iter.next()) { |
| if (iter.type() == relocInfo::oop_type) { |
| oop_Relocation* reloc = iter.oop_reloc(); |
| if (!reloc->oop_is_immediate()) { |
| reloc->verify_oop_relocation(); |
| } |
| } |
| } |
| } |
| |
| |
| ScopeDesc* CompiledMethod::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(), pd->should_reexecute(), pd->rethrow_exception(), |
| pd->return_oop()); |
| } |
| |
| ScopeDesc* CompiledMethod::scope_desc_near(address pc) { |
| PcDesc* pd = pc_desc_near(pc); |
| guarantee(pd != NULL, "scope must be present"); |
| return new ScopeDesc(this, pd->scope_decode_offset(), |
| pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), |
| pd->return_oop()); |
| } |
| |
| address CompiledMethod::oops_reloc_begin() const { |
| // 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() && is_nmethod()) { |
| 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?? |
| } |
| return low_boundary; |
| } |
| |
| int CompiledMethod::verify_icholder_relocations() { |
| ResourceMark rm; |
| int count = 0; |
| |
| RelocIterator iter(this); |
| while(iter.next()) { |
| if (iter.type() == relocInfo::virtual_call_type) { |
| if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc(), this)) { |
| CompiledIC *ic = CompiledIC_at(&iter); |
| if (TraceCompiledIC) { |
| tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); |
| ic->print(); |
| } |
| assert(ic->cached_icholder() != NULL, "must be non-NULL"); |
| count++; |
| } |
| } |
| } |
| |
| return count; |
| } |
| |
| // Method that knows how to preserve outgoing arguments at call. This method must be |
| // called with a frame corresponding to a Java invoke |
| void CompiledMethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { |
| if (method() != NULL && !method()->is_native()) { |
| address pc = fr.pc(); |
| SimpleScopeDesc ssd(this, pc); |
| Bytecode_invoke call(ssd.method(), ssd.bci()); |
| bool has_receiver = call.has_receiver(); |
| bool has_appendix = call.has_appendix(); |
| Symbol* signature = call.signature(); |
| |
| // The method attached by JIT-compilers should be used, if present. |
| // Bytecode can be inaccurate in such case. |
| Method* callee = attached_method_before_pc(pc); |
| if (callee != NULL) { |
| has_receiver = !(callee->access_flags().is_static()); |
| has_appendix = false; |
| signature = callee->signature(); |
| } |
| |
| fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); |
| } |
| } |
| |
| Method* CompiledMethod::attached_method(address call_instr) { |
| assert(code_contains(call_instr), "not part of the nmethod"); |
| RelocIterator iter(this, call_instr, call_instr + 1); |
| while (iter.next()) { |
| if (iter.addr() == call_instr) { |
| switch(iter.type()) { |
| case relocInfo::static_call_type: return iter.static_call_reloc()->method_value(); |
| case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value(); |
| case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value(); |
| default: break; |
| } |
| } |
| } |
| return NULL; // not found |
| } |
| |
| Method* CompiledMethod::attached_method_before_pc(address pc) { |
| if (NativeCall::is_call_before(pc)) { |
| NativeCall* ncall = nativeCall_before(pc); |
| return attached_method(ncall->instruction_address()); |
| } |
| return NULL; // not a call |
| } |
| |
| void CompiledMethod::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(); |
| } |
| } |
| |
| // Clear IC callsites, releasing ICStubs of all compiled ICs |
| // as well as any associated CompiledICHolders. |
| void CompiledMethod::clear_ic_callsites() { |
| assert_locked_or_safepoint(CompiledIC_lock); |
| ResourceMark rm; |
| RelocIterator iter(this); |
| while(iter.next()) { |
| if (iter.type() == relocInfo::virtual_call_type) { |
| CompiledIC* ic = CompiledIC_at(&iter); |
| ic->set_to_clean(false); |
| } |
| } |
| } |
| |
| #ifdef ASSERT |
| // Check class_loader is alive for this bit of metadata. |
| static void check_class(Metadata* md) { |
| Klass* klass = NULL; |
| if (md->is_klass()) { |
| klass = ((Klass*)md); |
| } else if (md->is_method()) { |
| klass = ((Method*)md)->method_holder(); |
| } else if (md->is_methodData()) { |
| klass = ((MethodData*)md)->method()->method_holder(); |
| } else { |
| md->print(); |
| ShouldNotReachHere(); |
| } |
| assert(klass->is_loader_alive(), "must be alive"); |
| } |
| #endif // ASSERT |
| |
| |
| void CompiledMethod::clean_ic_if_metadata_is_dead(CompiledIC *ic) { |
| if (ic->is_icholder_call()) { |
| // The only exception is compiledICHolder metdata which may |
| // yet be marked below. (We check this further below). |
| CompiledICHolder* cichk_metdata = ic->cached_icholder(); |
| |
| if (cichk_metdata->is_loader_alive()) { |
| return; |
| } |
| } else { |
| Metadata* ic_metdata = ic->cached_metadata(); |
| if (ic_metdata != NULL) { |
| if (ic_metdata->is_klass()) { |
| if (((Klass*)ic_metdata)->is_loader_alive()) { |
| return; |
| } |
| } else if (ic_metdata->is_method()) { |
| Method* method = (Method*)ic_metdata; |
| assert(!method->is_old(), "old method should have been cleaned"); |
| if (method->method_holder()->is_loader_alive()) { |
| return; |
| } |
| } else { |
| ShouldNotReachHere(); |
| } |
| } |
| } |
| |
| ic->set_to_clean(); |
| } |
| |
| unsigned char CompiledMethod::_global_unloading_clock = 0; |
| |
| void CompiledMethod::increase_unloading_clock() { |
| _global_unloading_clock++; |
| if (_global_unloading_clock == 0) { |
| // _nmethods are allocated with _unloading_clock == 0, |
| // so 0 is never used as a clock value. |
| _global_unloading_clock = 1; |
| } |
| } |
| |
| void CompiledMethod::set_unloading_clock(unsigned char unloading_clock) { |
| OrderAccess::release_store(&_unloading_clock, unloading_clock); |
| } |
| |
| unsigned char CompiledMethod::unloading_clock() { |
| return OrderAccess::load_acquire(&_unloading_clock); |
| } |
| |
| |
| // static_stub_Relocations may have dangling references to |
| // nmethods so trim them out here. Otherwise it looks like |
| // compiled code is maintaining a link to dead metadata. |
| void CompiledMethod::clean_ic_stubs() { |
| #ifdef ASSERT |
| address low_boundary = oops_reloc_begin(); |
| RelocIterator iter(this, low_boundary); |
| while (iter.next()) { |
| address static_call_addr = NULL; |
| if (iter.type() == relocInfo::opt_virtual_call_type) { |
| CompiledIC* cic = CompiledIC_at(&iter); |
| if (!cic->is_call_to_interpreted()) { |
| static_call_addr = iter.addr(); |
| } |
| } else if (iter.type() == relocInfo::static_call_type) { |
| CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); |
| if (!csc->is_call_to_interpreted()) { |
| static_call_addr = iter.addr(); |
| } |
| } |
| if (static_call_addr != NULL) { |
| RelocIterator sciter(this, low_boundary); |
| while (sciter.next()) { |
| if (sciter.type() == relocInfo::static_stub_type && |
| sciter.static_stub_reloc()->static_call() == static_call_addr) { |
| sciter.static_stub_reloc()->clear_inline_cache(); |
| } |
| } |
| } |
| } |
| #endif |
| } |
| |
| // 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 CompiledMethod::do_unloading(BoolObjectClosure* is_alive) { |
| // Make sure the oop's ready to receive visitors |
| assert(!is_zombie() && !is_unloaded(), |
| "should not call follow on zombie or unloaded nmethod"); |
| |
| address low_boundary = oops_reloc_begin(); |
| |
| if (do_unloading_oops(low_boundary, is_alive)) { |
| return; |
| } |
| |
| #if INCLUDE_JVMCI |
| if (do_unloading_jvmci()) { |
| return; |
| } |
| #endif |
| |
| // Cleanup exception cache and inline caches happens |
| // after all the unloaded methods are found. |
| } |
| |
| // Clean references to unloaded nmethods at addr from this one, which is not unloaded. |
| template <class CompiledICorStaticCall> |
| static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, CompiledMethod* from, |
| bool parallel, bool clean_all) { |
| // Ok, to lookup references to zombies here |
| CodeBlob *cb = CodeCache::find_blob_unsafe(addr); |
| CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; |
| if (nm != NULL) { |
| if (parallel && nm->unloading_clock() != CompiledMethod::global_unloading_clock()) { |
| // The nmethod has not been processed yet. |
| return true; |
| } |
| |
| // Clean inline caches pointing to both zombie and not_entrant methods |
| if (clean_all || !nm->is_in_use() || (nm->method()->code() != nm)) { |
| ic->set_to_clean(from->is_alive()); |
| assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string()); |
| } |
| } |
| |
| return false; |
| } |
| |
| static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, CompiledMethod* from, |
| bool parallel, bool clean_all = false) { |
| return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), from, parallel, clean_all); |
| } |
| |
| static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, CompiledMethod* from, |
| bool parallel, bool clean_all = false) { |
| return clean_if_nmethod_is_unloaded(csc, csc->destination(), from, parallel, clean_all); |
| } |
| |
| bool CompiledMethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { |
| ResourceMark rm; |
| |
| // Make sure the oop's ready to receive visitors |
| assert(!is_zombie() && !is_unloaded(), |
| "should not call follow on zombie or unloaded nmethod"); |
| |
| address low_boundary = oops_reloc_begin(); |
| |
| if (do_unloading_oops(low_boundary, is_alive)) { |
| return false; |
| } |
| |
| #if INCLUDE_JVMCI |
| if (do_unloading_jvmci()) { |
| return false; |
| } |
| #endif |
| |
| return unload_nmethod_caches(/*parallel*/true, unloading_occurred); |
| } |
| |
| // Cleans caches in nmethods that point to either classes that are unloaded |
| // or nmethods that are unloaded. |
| // |
| // Can be called either in parallel by G1 currently or after all |
| // nmethods are unloaded. Return postponed=true in the parallel case for |
| // inline caches found that point to nmethods that are not yet visited during |
| // the do_unloading walk. |
| bool CompiledMethod::unload_nmethod_caches(bool parallel, bool unloading_occurred) { |
| |
| // Exception cache only needs to be called if unloading occurred |
| if (unloading_occurred) { |
| clean_exception_cache(); |
| } |
| |
| bool postponed = cleanup_inline_caches_impl(parallel, unloading_occurred, /*clean_all*/false); |
| |
| // All static stubs need to be cleaned. |
| clean_ic_stubs(); |
| |
| // Check that the metadata embedded in the nmethod is alive |
| DEBUG_ONLY(metadata_do(check_class)); |
| |
| return postponed; |
| } |
| |
| // Called to clean up after class unloading for live nmethods and from the sweeper |
| // for all methods. |
| bool CompiledMethod::cleanup_inline_caches_impl(bool parallel, bool unloading_occurred, bool clean_all) { |
| assert_locked_or_safepoint(CompiledIC_lock); |
| bool postponed = false; |
| ResourceMark rm; |
| |
| // Find all calls in an nmethod and clear the ones that point to non-entrant, |
| // zombie and unloaded nmethods. |
| RelocIterator iter(this, oops_reloc_begin()); |
| while(iter.next()) { |
| |
| switch (iter.type()) { |
| |
| case relocInfo::virtual_call_type: |
| if (unloading_occurred) { |
| // If class unloading occurred we first clear ICs where the cached metadata |
| // is referring to an unloaded klass or method. |
| clean_ic_if_metadata_is_dead(CompiledIC_at(&iter)); |
| } |
| |
| postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), this, parallel, clean_all); |
| break; |
| |
| case relocInfo::opt_virtual_call_type: |
| postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), this, parallel, clean_all); |
| break; |
| |
| case relocInfo::static_call_type: |
| postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), this, parallel, clean_all); |
| break; |
| |
| case relocInfo::oop_type: |
| // handled by do_unloading_oops already |
| break; |
| |
| case relocInfo::metadata_type: |
| break; // nothing to do. |
| |
| default: |
| break; |
| } |
| } |
| |
| return postponed; |
| } |
| |
| void CompiledMethod::do_unloading_parallel_postponed() { |
| ResourceMark rm; |
| |
| // Make sure the oop's ready to receive visitors |
| assert(!is_zombie(), |
| "should not call follow on zombie nmethod"); |
| |
| RelocIterator iter(this, oops_reloc_begin()); |
| while(iter.next()) { |
| |
| switch (iter.type()) { |
| |
| case relocInfo::virtual_call_type: |
| clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), this, true); |
| break; |
| |
| case relocInfo::opt_virtual_call_type: |
| clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), this, true); |
| break; |
| |
| case relocInfo::static_call_type: |
| clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), this, true); |
| break; |
| |
| default: |
| break; |
| } |
| } |
| } |
| |