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/*
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "code/compiledIC.hpp"
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#include "code/scopeDesc.hpp"
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#include "code/codeCache.hpp"
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#include "prims/methodHandles.hpp"
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#include "interpreter/bytecode.hpp"
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#include "memory/resourceArea.hpp"
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#include "runtime/mutexLocker.hpp"
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CompiledMethod::CompiledMethod(Method* method, const char* name, const CodeBlobLayout& layout, int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps, bool caller_must_gc_arguments)
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: CodeBlob(name, layout, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments),
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_method(method), _mark_for_deoptimization_status(not_marked) {
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init_defaults();
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}
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CompiledMethod::CompiledMethod(Method* method, const char* name, int size, int header_size, CodeBuffer* cb, int frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments)
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: CodeBlob(name, CodeBlobLayout((address) this, size, header_size, cb), cb, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments),
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_method(method), _mark_for_deoptimization_status(not_marked) {
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init_defaults();
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}
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void CompiledMethod::init_defaults() {
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_has_unsafe_access = 0;
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_has_method_handle_invokes = 0;
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_lazy_critical_native = 0;
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_has_wide_vectors = 0;
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_unloading_clock = 0;
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}
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bool CompiledMethod::is_method_handle_return(address return_pc) {
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if (!has_method_handle_invokes()) return false;
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PcDesc* pd = pc_desc_at(return_pc);
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if (pd == NULL)
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return false;
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return pd->is_method_handle_invoke();
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}
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// When using JVMCI the address might be off by the size of a call instruction.
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bool CompiledMethod::is_deopt_entry(address pc) {
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return pc == deopt_handler_begin()
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#if INCLUDE_JVMCI
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|| pc == (deopt_handler_begin() + NativeCall::instruction_size)
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#endif
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;
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}
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// Returns a string version of the method state.
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const char* CompiledMethod::state() const {
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int state = get_state();
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switch (state) {
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case in_use:
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return "in use";
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case not_used:
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return "not_used";
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case not_entrant:
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return "not_entrant";
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case zombie:
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return "zombie";
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case unloaded:
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return "unloaded";
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default:
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fatal("unexpected method state: %d", state);
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return NULL;
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}
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}
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//-----------------------------------------------------------------------------
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void CompiledMethod::add_exception_cache_entry(ExceptionCache* new_entry) {
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assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
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assert(new_entry != NULL,"Must be non null");
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assert(new_entry->next() == NULL, "Must be null");
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ExceptionCache *ec = exception_cache();
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if (ec != NULL) {
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new_entry->set_next(ec);
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}
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release_set_exception_cache(new_entry);
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}
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void CompiledMethod::clean_exception_cache(BoolObjectClosure* is_alive) {
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ExceptionCache* prev = NULL;
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ExceptionCache* curr = exception_cache();
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while (curr != NULL) {
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ExceptionCache* next = curr->next();
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Klass* ex_klass = curr->exception_type();
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if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
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if (prev == NULL) {
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set_exception_cache(next);
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} else {
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prev->set_next(next);
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}
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delete curr;
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// prev stays the same.
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} else {
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prev = curr;
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}
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curr = next;
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}
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}
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// public method for accessing the exception cache
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// These are the public access methods.
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address CompiledMethod::handler_for_exception_and_pc(Handle exception, address pc) {
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// We never grab a lock to read the exception cache, so we may
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// have false negatives. This is okay, as it can only happen during
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// the first few exception lookups for a given nmethod.
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ExceptionCache* ec = exception_cache();
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while (ec != NULL) {
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address ret_val;
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if ((ret_val = ec->match(exception,pc)) != NULL) {
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return ret_val;
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}
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ec = ec->next();
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}
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return NULL;
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}
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void CompiledMethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
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// There are potential race conditions during exception cache updates, so we
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// must own the ExceptionCache_lock before doing ANY modifications. Because
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// we don't lock during reads, it is possible to have several threads attempt
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// to update the cache with the same data. We need to check for already inserted
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// copies of the current data before adding it.
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MutexLocker ml(ExceptionCache_lock);
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ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
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if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
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target_entry = new ExceptionCache(exception,pc,handler);
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add_exception_cache_entry(target_entry);
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}
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}
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//-------------end of code for ExceptionCache--------------
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// private method for handling exception cache
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// These methods are private, and used to manipulate the exception cache
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// directly.
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ExceptionCache* CompiledMethod::exception_cache_entry_for_exception(Handle exception) {
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ExceptionCache* ec = exception_cache();
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while (ec != NULL) {
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if (ec->match_exception_with_space(exception)) {
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return ec;
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}
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ec = ec->next();
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}
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return NULL;
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}
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bool CompiledMethod::is_at_poll_return(address pc) {
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RelocIterator iter(this, pc, pc+1);
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while (iter.next()) {
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if (iter.type() == relocInfo::poll_return_type)
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return true;
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}
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return false;
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}
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bool CompiledMethod::is_at_poll_or_poll_return(address pc) {
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RelocIterator iter(this, pc, pc+1);
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while (iter.next()) {
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relocInfo::relocType t = iter.type();
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if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
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return true;
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}
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return false;
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}
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void CompiledMethod::verify_oop_relocations() {
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// Ensure sure that the code matches the current oop values
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RelocIterator iter(this, NULL, NULL);
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while (iter.next()) {
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if (iter.type() == relocInfo::oop_type) {
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oop_Relocation* reloc = iter.oop_reloc();
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if (!reloc->oop_is_immediate()) {
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reloc->verify_oop_relocation();
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}
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}
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}
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}
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ScopeDesc* CompiledMethod::scope_desc_at(address pc) {
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PcDesc* pd = pc_desc_at(pc);
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guarantee(pd != NULL, "scope must be present");
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return new ScopeDesc(this, pd->scope_decode_offset(),
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pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
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pd->return_oop());
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}
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void CompiledMethod::cleanup_inline_caches(bool clean_all/*=false*/) {
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assert_locked_or_safepoint(CompiledIC_lock);
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// If the method is not entrant or zombie then a JMP is plastered over the
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// first few bytes. If an oop in the old code was there, that oop
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// should not get GC'd. Skip the first few bytes of oops on
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// not-entrant methods.
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address low_boundary = verified_entry_point();
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if (!is_in_use() && is_nmethod()) {
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low_boundary += NativeJump::instruction_size;
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// %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
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// This means that the low_boundary is going to be a little too high.
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// This shouldn't matter, since oops of non-entrant methods are never used.
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// In fact, why are we bothering to look at oops in a non-entrant method??
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}
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// Find all calls in an nmethod and clear the ones that point to non-entrant,
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// zombie and unloaded nmethods.
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ResourceMark rm;
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RelocIterator iter(this, low_boundary);
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while(iter.next()) {
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switch(iter.type()) {
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case relocInfo::virtual_call_type:
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case relocInfo::opt_virtual_call_type: {
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CompiledIC *ic = CompiledIC_at(&iter);
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// Ok, to lookup references to zombies here
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CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
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if( cb != NULL && cb->is_compiled() ) {
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CompiledMethod* nm = cb->as_compiled_method();
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// Clean inline caches pointing to zombie, non-entrant and unloaded methods
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if (clean_all || !nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive());
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}
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break;
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}
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case relocInfo::static_call_type: {
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CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
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CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
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if( cb != NULL && cb->is_compiled() ) {
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CompiledMethod* cm = cb->as_compiled_method();
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// Clean inline caches pointing to zombie, non-entrant and unloaded methods
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if (clean_all || !cm->is_in_use() || (cm->method()->code() != cm)) {
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csc->set_to_clean();
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}
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}
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break;
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}
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}
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}
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}
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int CompiledMethod::verify_icholder_relocations() {
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ResourceMark rm;
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int count = 0;
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RelocIterator iter(this);
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while(iter.next()) {
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if (iter.type() == relocInfo::virtual_call_type) {
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if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
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CompiledIC *ic = CompiledIC_at(&iter);
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if (TraceCompiledIC) {
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tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder()));
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ic->print();
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}
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assert(ic->cached_icholder() != NULL, "must be non-NULL");
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count++;
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}
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}
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}
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return count;
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}
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// Method that knows how to preserve outgoing arguments at call. This method must be
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// called with a frame corresponding to a Java invoke
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void CompiledMethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
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#ifndef SHARK
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if (method() != NULL && !method()->is_native()) {
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address pc = fr.pc();
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SimpleScopeDesc ssd(this, pc);
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Bytecode_invoke call(ssd.method(), ssd.bci());
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bool has_receiver = call.has_receiver();
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bool has_appendix = call.has_appendix();
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Symbol* signature = call.signature();
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// The method attached by JIT-compilers should be used, if present.
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// Bytecode can be inaccurate in such case.
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Method* callee = attached_method_before_pc(pc);
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if (callee != NULL) {
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has_receiver = !(callee->access_flags().is_static());
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has_appendix = false;
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signature = callee->signature();
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}
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fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
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}
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#endif // !SHARK
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}
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// -----------------------------------------------------------------------------
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// CompiledMethod::get_deopt_original_pc
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//
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// Return the original PC for the given PC if:
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// (a) the given PC belongs to a nmethod and
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// (b) it is a deopt PC
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address CompiledMethod::get_deopt_original_pc(const frame* fr) {
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if (fr->cb() == NULL) return NULL;
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CompiledMethod* cm = fr->cb()->as_compiled_method_or_null();
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if (cm != NULL && cm->is_deopt_pc(fr->pc()))
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return cm->get_original_pc(fr);
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return NULL;
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}
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Method* CompiledMethod::attached_method(address call_instr) {
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assert(code_contains(call_instr), "not part of the nmethod");
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RelocIterator iter(this, call_instr, call_instr + 1);
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while (iter.next()) {
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if (iter.addr() == call_instr) {
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switch(iter.type()) {
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case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
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case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
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case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
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}
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}
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}
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return NULL; // not found
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}
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Method* CompiledMethod::attached_method_before_pc(address pc) {
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if (NativeCall::is_call_before(pc)) {
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NativeCall* ncall = nativeCall_before(pc);
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return attached_method(ncall->instruction_address());
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}
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return NULL; // not a call
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}
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void CompiledMethod::clear_inline_caches() {
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assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
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if (is_zombie()) {
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return;
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}
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RelocIterator iter(this);
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while (iter.next()) {
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iter.reloc()->clear_inline_cache();
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}
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}
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// Clear ICStubs of all compiled ICs
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void CompiledMethod::clear_ic_stubs() {
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assert_locked_or_safepoint(CompiledIC_lock);
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RelocIterator iter(this);
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while(iter.next()) {
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if (iter.type() == relocInfo::virtual_call_type) {
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CompiledIC* ic = CompiledIC_at(&iter);
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ic->clear_ic_stub();
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}
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}
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}
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#ifdef ASSERT
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class CheckClass : AllStatic {
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static BoolObjectClosure* _is_alive;
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// Check class_loader is alive for this bit of metadata.
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static void check_class(Metadata* md) {
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Klass* klass = NULL;
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if (md->is_klass()) {
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klass = ((Klass*)md);
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} else if (md->is_method()) {
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klass = ((Method*)md)->method_holder();
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} else if (md->is_methodData()) {
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|
394 |
klass = ((MethodData*)md)->method()->method_holder();
|
|
395 |
} else {
|
|
396 |
md->print();
|
|
397 |
ShouldNotReachHere();
|
|
398 |
}
|
|
399 |
assert(klass->is_loader_alive(_is_alive), "must be alive");
|
|
400 |
}
|
|
401 |
public:
|
|
402 |
static void do_check_class(BoolObjectClosure* is_alive, CompiledMethod* nm) {
|
|
403 |
assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
|
|
404 |
_is_alive = is_alive;
|
|
405 |
nm->metadata_do(check_class);
|
|
406 |
}
|
|
407 |
};
|
|
408 |
|
|
409 |
// This is called during a safepoint so can use static data
|
|
410 |
BoolObjectClosure* CheckClass::_is_alive = NULL;
|
|
411 |
#endif // ASSERT
|
|
412 |
|
|
413 |
void CompiledMethod::clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) {
|
|
414 |
if (ic->is_icholder_call()) {
|
|
415 |
// The only exception is compiledICHolder oops which may
|
|
416 |
// yet be marked below. (We check this further below).
|
|
417 |
CompiledICHolder* cichk_oop = ic->cached_icholder();
|
|
418 |
|
|
419 |
if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
|
|
420 |
cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
|
|
421 |
return;
|
|
422 |
}
|
|
423 |
} else {
|
|
424 |
Metadata* ic_oop = ic->cached_metadata();
|
|
425 |
if (ic_oop != NULL) {
|
|
426 |
if (ic_oop->is_klass()) {
|
|
427 |
if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
|
|
428 |
return;
|
|
429 |
}
|
|
430 |
} else if (ic_oop->is_method()) {
|
|
431 |
if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
|
|
432 |
return;
|
|
433 |
}
|
|
434 |
} else {
|
|
435 |
ShouldNotReachHere();
|
|
436 |
}
|
|
437 |
}
|
|
438 |
}
|
|
439 |
|
|
440 |
ic->set_to_clean();
|
|
441 |
}
|
|
442 |
|
|
443 |
unsigned char CompiledMethod::_global_unloading_clock = 0;
|
|
444 |
|
|
445 |
void CompiledMethod::increase_unloading_clock() {
|
|
446 |
_global_unloading_clock++;
|
|
447 |
if (_global_unloading_clock == 0) {
|
|
448 |
// _nmethods are allocated with _unloading_clock == 0,
|
|
449 |
// so 0 is never used as a clock value.
|
|
450 |
_global_unloading_clock = 1;
|
|
451 |
}
|
|
452 |
}
|
|
453 |
|
|
454 |
void CompiledMethod::set_unloading_clock(unsigned char unloading_clock) {
|
|
455 |
OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock);
|
|
456 |
}
|
|
457 |
|
|
458 |
unsigned char CompiledMethod::unloading_clock() {
|
|
459 |
return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock);
|
|
460 |
}
|
|
461 |
|
|
462 |
// Processing of oop references should have been sufficient to keep
|
|
463 |
// all strong references alive. Any weak references should have been
|
|
464 |
// cleared as well. Visit all the metadata and ensure that it's
|
|
465 |
// really alive.
|
|
466 |
void CompiledMethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
|
|
467 |
#ifdef ASSERT
|
|
468 |
RelocIterator iter(this, low_boundary);
|
|
469 |
while (iter.next()) {
|
|
470 |
// static_stub_Relocations may have dangling references to
|
|
471 |
// Method*s so trim them out here. Otherwise it looks like
|
|
472 |
// compiled code is maintaining a link to dead metadata.
|
|
473 |
address static_call_addr = NULL;
|
|
474 |
if (iter.type() == relocInfo::opt_virtual_call_type) {
|
|
475 |
CompiledIC* cic = CompiledIC_at(&iter);
|
|
476 |
if (!cic->is_call_to_interpreted()) {
|
|
477 |
static_call_addr = iter.addr();
|
|
478 |
}
|
|
479 |
} else if (iter.type() == relocInfo::static_call_type) {
|
|
480 |
CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
|
|
481 |
if (!csc->is_call_to_interpreted()) {
|
|
482 |
static_call_addr = iter.addr();
|
|
483 |
}
|
|
484 |
}
|
|
485 |
if (static_call_addr != NULL) {
|
|
486 |
RelocIterator sciter(this, low_boundary);
|
|
487 |
while (sciter.next()) {
|
|
488 |
if (sciter.type() == relocInfo::static_stub_type &&
|
|
489 |
sciter.static_stub_reloc()->static_call() == static_call_addr) {
|
|
490 |
sciter.static_stub_reloc()->clear_inline_cache();
|
|
491 |
}
|
|
492 |
}
|
|
493 |
}
|
|
494 |
}
|
|
495 |
// Check that the metadata embedded in the nmethod is alive
|
|
496 |
CheckClass::do_check_class(is_alive, this);
|
|
497 |
#endif
|
|
498 |
}
|
|
499 |
|
|
500 |
// This is called at the end of the strong tracing/marking phase of a
|
|
501 |
// GC to unload an nmethod if it contains otherwise unreachable
|
|
502 |
// oops.
|
|
503 |
|
|
504 |
void CompiledMethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
|
|
505 |
// Make sure the oop's ready to receive visitors
|
|
506 |
assert(!is_zombie() && !is_unloaded(),
|
|
507 |
"should not call follow on zombie or unloaded nmethod");
|
|
508 |
|
|
509 |
// If the method is not entrant then a JMP is plastered over the
|
|
510 |
// first few bytes. If an oop in the old code was there, that oop
|
|
511 |
// should not get GC'd. Skip the first few bytes of oops on
|
|
512 |
// not-entrant methods.
|
|
513 |
address low_boundary = verified_entry_point();
|
|
514 |
if (is_not_entrant()) {
|
|
515 |
low_boundary += NativeJump::instruction_size;
|
|
516 |
// %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
|
|
517 |
// (See comment above.)
|
|
518 |
}
|
|
519 |
|
|
520 |
// The RedefineClasses() API can cause the class unloading invariant
|
|
521 |
// to no longer be true. See jvmtiExport.hpp for details.
|
|
522 |
// Also, leave a debugging breadcrumb in local flag.
|
|
523 |
if (JvmtiExport::has_redefined_a_class()) {
|
|
524 |
// This set of the unloading_occurred flag is done before the
|
|
525 |
// call to post_compiled_method_unload() so that the unloading
|
|
526 |
// of this nmethod is reported.
|
|
527 |
unloading_occurred = true;
|
|
528 |
}
|
|
529 |
|
|
530 |
// Exception cache
|
|
531 |
clean_exception_cache(is_alive);
|
|
532 |
|
|
533 |
// If class unloading occurred we first iterate over all inline caches and
|
|
534 |
// clear ICs where the cached oop is referring to an unloaded klass or method.
|
|
535 |
// The remaining live cached oops will be traversed in the relocInfo::oop_type
|
|
536 |
// iteration below.
|
|
537 |
if (unloading_occurred) {
|
|
538 |
RelocIterator iter(this, low_boundary);
|
|
539 |
while(iter.next()) {
|
|
540 |
if (iter.type() == relocInfo::virtual_call_type) {
|
|
541 |
CompiledIC *ic = CompiledIC_at(&iter);
|
|
542 |
clean_ic_if_metadata_is_dead(ic, is_alive);
|
|
543 |
}
|
|
544 |
}
|
|
545 |
}
|
|
546 |
|
|
547 |
if (do_unloading_oops(low_boundary, is_alive, unloading_occurred)) {
|
|
548 |
return;
|
|
549 |
}
|
|
550 |
|
|
551 |
#if INCLUDE_JVMCI
|
|
552 |
if (do_unloading_jvmci(is_alive, unloading_occurred)) {
|
|
553 |
return;
|
|
554 |
}
|
|
555 |
#endif
|
|
556 |
|
|
557 |
// Ensure that all metadata is still alive
|
|
558 |
verify_metadata_loaders(low_boundary, is_alive);
|
|
559 |
}
|
|
560 |
|
|
561 |
template <class CompiledICorStaticCall>
|
|
562 |
static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, CompiledMethod* from) {
|
|
563 |
// Ok, to lookup references to zombies here
|
|
564 |
CodeBlob *cb = CodeCache::find_blob_unsafe(addr);
|
|
565 |
CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
|
|
566 |
if (nm != NULL) {
|
|
567 |
if (nm->unloading_clock() != CompiledMethod::global_unloading_clock()) {
|
|
568 |
// The nmethod has not been processed yet.
|
|
569 |
return true;
|
|
570 |
}
|
|
571 |
|
|
572 |
// Clean inline caches pointing to both zombie and not_entrant methods
|
|
573 |
if (!nm->is_in_use() || (nm->method()->code() != nm)) {
|
|
574 |
ic->set_to_clean();
|
|
575 |
assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string());
|
|
576 |
}
|
|
577 |
}
|
|
578 |
|
|
579 |
return false;
|
|
580 |
}
|
|
581 |
|
|
582 |
static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, CompiledMethod* from) {
|
|
583 |
return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from);
|
|
584 |
}
|
|
585 |
|
|
586 |
static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, CompiledMethod* from) {
|
|
587 |
return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from);
|
|
588 |
}
|
|
589 |
|
|
590 |
bool CompiledMethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) {
|
|
591 |
ResourceMark rm;
|
|
592 |
|
|
593 |
// Make sure the oop's ready to receive visitors
|
|
594 |
assert(!is_zombie() && !is_unloaded(),
|
|
595 |
"should not call follow on zombie or unloaded nmethod");
|
|
596 |
|
|
597 |
// If the method is not entrant then a JMP is plastered over the
|
|
598 |
// first few bytes. If an oop in the old code was there, that oop
|
|
599 |
// should not get GC'd. Skip the first few bytes of oops on
|
|
600 |
// not-entrant methods.
|
|
601 |
address low_boundary = verified_entry_point();
|
|
602 |
if (is_not_entrant()) {
|
|
603 |
low_boundary += NativeJump::instruction_size;
|
|
604 |
// %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
|
|
605 |
// (See comment above.)
|
|
606 |
}
|
|
607 |
|
|
608 |
// The RedefineClasses() API can cause the class unloading invariant
|
|
609 |
// to no longer be true. See jvmtiExport.hpp for details.
|
|
610 |
// Also, leave a debugging breadcrumb in local flag.
|
|
611 |
if (JvmtiExport::has_redefined_a_class()) {
|
|
612 |
// This set of the unloading_occurred flag is done before the
|
|
613 |
// call to post_compiled_method_unload() so that the unloading
|
|
614 |
// of this nmethod is reported.
|
|
615 |
unloading_occurred = true;
|
|
616 |
}
|
|
617 |
|
|
618 |
// Exception cache
|
|
619 |
clean_exception_cache(is_alive);
|
|
620 |
|
|
621 |
bool postponed = false;
|
|
622 |
|
|
623 |
RelocIterator iter(this, low_boundary);
|
|
624 |
while(iter.next()) {
|
|
625 |
|
|
626 |
switch (iter.type()) {
|
|
627 |
|
|
628 |
case relocInfo::virtual_call_type:
|
|
629 |
if (unloading_occurred) {
|
|
630 |
// If class unloading occurred we first iterate over all inline caches and
|
|
631 |
// clear ICs where the cached oop is referring to an unloaded klass or method.
|
|
632 |
clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive);
|
|
633 |
}
|
|
634 |
|
|
635 |
postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
|
|
636 |
break;
|
|
637 |
|
|
638 |
case relocInfo::opt_virtual_call_type:
|
|
639 |
postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
|
|
640 |
break;
|
|
641 |
|
|
642 |
case relocInfo::static_call_type:
|
|
643 |
postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
|
|
644 |
break;
|
|
645 |
|
|
646 |
case relocInfo::oop_type:
|
|
647 |
// handled by do_unloading_oops below
|
|
648 |
break;
|
|
649 |
|
|
650 |
case relocInfo::metadata_type:
|
|
651 |
break; // nothing to do.
|
|
652 |
}
|
|
653 |
}
|
|
654 |
|
|
655 |
if (do_unloading_oops(low_boundary, is_alive, unloading_occurred)) {
|
|
656 |
return postponed;
|
|
657 |
}
|
|
658 |
|
|
659 |
#if INCLUDE_JVMCI
|
|
660 |
if (do_unloading_jvmci(is_alive, unloading_occurred)) {
|
|
661 |
return postponed;
|
|
662 |
}
|
|
663 |
#endif
|
|
664 |
|
|
665 |
// Ensure that all metadata is still alive
|
|
666 |
verify_metadata_loaders(low_boundary, is_alive);
|
|
667 |
|
|
668 |
return postponed;
|
|
669 |
}
|
|
670 |
|
|
671 |
void CompiledMethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) {
|
|
672 |
ResourceMark rm;
|
|
673 |
|
|
674 |
// Make sure the oop's ready to receive visitors
|
|
675 |
assert(!is_zombie(),
|
|
676 |
"should not call follow on zombie nmethod");
|
|
677 |
|
|
678 |
// If the method is not entrant then a JMP is plastered over the
|
|
679 |
// first few bytes. If an oop in the old code was there, that oop
|
|
680 |
// should not get GC'd. Skip the first few bytes of oops on
|
|
681 |
// not-entrant methods.
|
|
682 |
address low_boundary = verified_entry_point();
|
|
683 |
if (is_not_entrant()) {
|
|
684 |
low_boundary += NativeJump::instruction_size;
|
|
685 |
// %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
|
|
686 |
// (See comment above.)
|
|
687 |
}
|
|
688 |
|
|
689 |
RelocIterator iter(this, low_boundary);
|
|
690 |
while(iter.next()) {
|
|
691 |
|
|
692 |
switch (iter.type()) {
|
|
693 |
|
|
694 |
case relocInfo::virtual_call_type:
|
|
695 |
clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
|
|
696 |
break;
|
|
697 |
|
|
698 |
case relocInfo::opt_virtual_call_type:
|
|
699 |
clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this);
|
|
700 |
break;
|
|
701 |
|
|
702 |
case relocInfo::static_call_type:
|
|
703 |
clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this);
|
|
704 |
break;
|
|
705 |
}
|
|
706 |
}
|
|
707 |
}
|