--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/jvmci/jvmciEnv.cpp Thu Oct 08 12:49:30 2015 -1000
@@ -0,0 +1,595 @@
+/*
+ * Copyright (c) 1999, 2011, 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 "jvmci/jvmciEnv.hpp"
+#include "classfile/javaAssertions.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "classfile/vmSymbols.hpp"
+#include "code/codeCache.hpp"
+#include "code/scopeDesc.hpp"
+#include "runtime/sweeper.hpp"
+#include "compiler/compileBroker.hpp"
+#include "compiler/compileLog.hpp"
+#include "compiler/compilerOracle.hpp"
+#include "interpreter/linkResolver.hpp"
+#include "memory/allocation.inline.hpp"
+#include "memory/oopFactory.hpp"
+#include "memory/universe.inline.hpp"
+#include "oops/methodData.hpp"
+#include "oops/objArrayKlass.hpp"
+#include "oops/oop.inline.hpp"
+#include "prims/jvmtiExport.hpp"
+#include "runtime/init.hpp"
+#include "runtime/reflection.hpp"
+#include "runtime/sharedRuntime.hpp"
+#include "utilities/dtrace.hpp"
+#include "jvmci/jvmciRuntime.hpp"
+#include "jvmci/jvmciJavaClasses.hpp"
+
+JVMCIEnv::JVMCIEnv(CompileTask* task, int system_dictionary_modification_counter) {
+ _task = task;
+ _system_dictionary_modification_counter = system_dictionary_modification_counter;
+ {
+ // Get Jvmti capabilities under lock to get consistent values.
+ MutexLocker mu(JvmtiThreadState_lock);
+ _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
+ _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables();
+ _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions();
+ }
+}
+
+// ------------------------------------------------------------------
+// Note: the logic of this method should mirror the logic of
+// constantPoolOopDesc::verify_constant_pool_resolve.
+bool JVMCIEnv::check_klass_accessibility(KlassHandle accessing_klass, KlassHandle resolved_klass) {
+ if (accessing_klass->oop_is_objArray()) {
+ accessing_klass = ObjArrayKlass::cast(accessing_klass())->bottom_klass();
+ }
+ if (!accessing_klass->oop_is_instance()) {
+ return true;
+ }
+
+ if (resolved_klass->oop_is_objArray()) {
+ // Find the element klass, if this is an array.
+ resolved_klass = ObjArrayKlass::cast(resolved_klass())->bottom_klass();
+ }
+ if (resolved_klass->oop_is_instance()) {
+ return Reflection::verify_class_access(accessing_klass(), resolved_klass(), true);
+ }
+ return true;
+}
+
+// ------------------------------------------------------------------
+KlassHandle JVMCIEnv::get_klass_by_name_impl(KlassHandle& accessing_klass,
+ constantPoolHandle& cpool,
+ Symbol* sym,
+ bool require_local) {
+ JVMCI_EXCEPTION_CONTEXT;
+
+ // Now we need to check the SystemDictionary
+ if (sym->byte_at(0) == 'L' &&
+ sym->byte_at(sym->utf8_length()-1) == ';') {
+ // This is a name from a signature. Strip off the trimmings.
+ // Call recursive to keep scope of strippedsym.
+ TempNewSymbol strippedsym = SymbolTable::new_symbol(sym->as_utf8()+1,
+ sym->utf8_length()-2,
+ CHECK_(KlassHandle()));
+ return get_klass_by_name_impl(accessing_klass, cpool, strippedsym, require_local);
+ }
+
+ Handle loader(THREAD, (oop)NULL);
+ Handle domain(THREAD, (oop)NULL);
+ if (!accessing_klass.is_null()) {
+ loader = Handle(THREAD, accessing_klass->class_loader());
+ domain = Handle(THREAD, accessing_klass->protection_domain());
+ }
+
+ KlassHandle found_klass;
+ {
+ ttyUnlocker ttyul; // release tty lock to avoid ordering problems
+ MutexLocker ml(Compile_lock);
+ Klass* kls;
+ if (!require_local) {
+ kls = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, CHECK_(KlassHandle()));
+ } else {
+ kls = SystemDictionary::find_instance_or_array_klass(sym, loader, domain, CHECK_(KlassHandle()));
+ }
+ found_klass = KlassHandle(THREAD, kls);
+ }
+
+ // If we fail to find an array klass, look again for its element type.
+ // The element type may be available either locally or via constraints.
+ // In either case, if we can find the element type in the system dictionary,
+ // we must build an array type around it. The CI requires array klasses
+ // to be loaded if their element klasses are loaded, except when memory
+ // is exhausted.
+ if (sym->byte_at(0) == '[' &&
+ (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
+ // We have an unloaded array.
+ // Build it on the fly if the element class exists.
+ TempNewSymbol elem_sym = SymbolTable::new_symbol(sym->as_utf8()+1,
+ sym->utf8_length()-1,
+ CHECK_(KlassHandle()));
+
+ // Get element Klass recursively.
+ KlassHandle elem_klass =
+ get_klass_by_name_impl(accessing_klass,
+ cpool,
+ elem_sym,
+ require_local);
+ if (!elem_klass.is_null()) {
+ // Now make an array for it
+ return elem_klass->array_klass(CHECK_(KlassHandle()));
+ }
+ }
+
+ if (found_klass.is_null() && !cpool.is_null() && cpool->has_preresolution()) {
+ // Look inside the constant pool for pre-resolved class entries.
+ for (int i = cpool->length() - 1; i >= 1; i--) {
+ if (cpool->tag_at(i).is_klass()) {
+ Klass* kls = cpool->resolved_klass_at(i);
+ if (kls->name() == sym) {
+ return kls;
+ }
+ }
+ }
+ }
+
+ return found_klass();
+}
+
+// ------------------------------------------------------------------
+KlassHandle JVMCIEnv::get_klass_by_name(KlassHandle& accessing_klass,
+ Symbol* klass_name,
+ bool require_local) {
+ ResourceMark rm;
+ constantPoolHandle cpool;
+ return get_klass_by_name_impl(accessing_klass,
+ cpool,
+ klass_name,
+ require_local);
+}
+
+// ------------------------------------------------------------------
+// Implementation of get_klass_by_index.
+KlassHandle JVMCIEnv::get_klass_by_index_impl(constantPoolHandle& cpool,
+ int index,
+ bool& is_accessible,
+ KlassHandle& accessor) {
+ JVMCI_EXCEPTION_CONTEXT;
+ KlassHandle klass (THREAD, ConstantPool::klass_at_if_loaded(cpool, index));
+ Symbol* klass_name = NULL;
+ if (klass.is_null()) {
+ klass_name = cpool->klass_name_at(index);
+ }
+
+ if (klass.is_null()) {
+ // Not found in constant pool. Use the name to do the lookup.
+ KlassHandle k = get_klass_by_name_impl(accessor,
+ cpool,
+ klass_name,
+ false);
+ // Calculate accessibility the hard way.
+ if (k.is_null()) {
+ is_accessible = false;
+ } else if (k->class_loader() != accessor->class_loader() &&
+ get_klass_by_name_impl(accessor, cpool, k->name(), true).is_null()) {
+ // Loaded only remotely. Not linked yet.
+ is_accessible = false;
+ } else {
+ // Linked locally, and we must also check public/private, etc.
+ is_accessible = check_klass_accessibility(accessor, k);
+ }
+ if (!is_accessible) {
+ return KlassHandle();
+ }
+ return k;
+ }
+
+ // It is known to be accessible, since it was found in the constant pool.
+ is_accessible = true;
+ return klass;
+}
+
+// ------------------------------------------------------------------
+// Get a klass from the constant pool.
+KlassHandle JVMCIEnv::get_klass_by_index(constantPoolHandle& cpool,
+ int index,
+ bool& is_accessible,
+ KlassHandle& accessor) {
+ ResourceMark rm;
+ KlassHandle result = get_klass_by_index_impl(cpool, index, is_accessible, accessor);
+ return result;
+}
+
+// ------------------------------------------------------------------
+// Implementation of get_field_by_index.
+//
+// Implementation note: the results of field lookups are cached
+// in the accessor klass.
+void JVMCIEnv::get_field_by_index_impl(instanceKlassHandle& klass, fieldDescriptor& field_desc,
+ int index) {
+ JVMCI_EXCEPTION_CONTEXT;
+
+ assert(klass->is_linked(), "must be linked before using its constant-pool");
+
+ constantPoolHandle cpool(thread, klass->constants());
+
+ // Get the field's name, signature, and type.
+ Symbol* name = cpool->name_ref_at(index);
+
+ int nt_index = cpool->name_and_type_ref_index_at(index);
+ int sig_index = cpool->signature_ref_index_at(nt_index);
+ Symbol* signature = cpool->symbol_at(sig_index);
+
+ // Get the field's declared holder.
+ int holder_index = cpool->klass_ref_index_at(index);
+ bool holder_is_accessible;
+ KlassHandle declared_holder = get_klass_by_index(cpool, holder_index,
+ holder_is_accessible,
+ klass);
+
+ // The declared holder of this field may not have been loaded.
+ // Bail out with partial field information.
+ if (!holder_is_accessible) {
+ return;
+ }
+
+
+ // Perform the field lookup.
+ Klass* canonical_holder =
+ InstanceKlass::cast(declared_holder())->find_field(name, signature, &field_desc);
+ if (canonical_holder == NULL) {
+ return;
+ }
+
+ assert(canonical_holder == field_desc.field_holder(), "just checking");
+}
+
+// ------------------------------------------------------------------
+// Get a field by index from a klass's constant pool.
+void JVMCIEnv::get_field_by_index(instanceKlassHandle& accessor, fieldDescriptor& fd, int index) {
+ ResourceMark rm;
+ return get_field_by_index_impl(accessor, fd, index);
+}
+
+// ------------------------------------------------------------------
+// Perform an appropriate method lookup based on accessor, holder,
+// name, signature, and bytecode.
+methodHandle JVMCIEnv::lookup_method(instanceKlassHandle& h_accessor,
+ instanceKlassHandle& h_holder,
+ Symbol* name,
+ Symbol* sig,
+ Bytecodes::Code bc) {
+ JVMCI_EXCEPTION_CONTEXT;
+ LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
+ methodHandle dest_method;
+ LinkInfo link_info(h_holder, name, sig, h_accessor, /*check_access*/true);
+ switch (bc) {
+ case Bytecodes::_invokestatic:
+ dest_method =
+ LinkResolver::resolve_static_call_or_null(link_info);
+ break;
+ case Bytecodes::_invokespecial:
+ dest_method =
+ LinkResolver::resolve_special_call_or_null(link_info);
+ break;
+ case Bytecodes::_invokeinterface:
+ dest_method =
+ LinkResolver::linktime_resolve_interface_method_or_null(link_info);
+ break;
+ case Bytecodes::_invokevirtual:
+ dest_method =
+ LinkResolver::linktime_resolve_virtual_method_or_null(link_info);
+ break;
+ default: ShouldNotReachHere();
+ }
+
+ return dest_method;
+}
+
+
+// ------------------------------------------------------------------
+methodHandle JVMCIEnv::get_method_by_index_impl(constantPoolHandle& cpool,
+ int index, Bytecodes::Code bc,
+ instanceKlassHandle& accessor) {
+ if (bc == Bytecodes::_invokedynamic) {
+ ConstantPoolCacheEntry* cpce = cpool->invokedynamic_cp_cache_entry_at(index);
+ bool is_resolved = !cpce->is_f1_null();
+ if (is_resolved) {
+ // Get the invoker Method* from the constant pool.
+ // (The appendix argument, if any, will be noted in the method's signature.)
+ Method* adapter = cpce->f1_as_method();
+ return methodHandle(adapter);
+ }
+
+ return NULL;
+ }
+
+ int holder_index = cpool->klass_ref_index_at(index);
+ bool holder_is_accessible;
+ KlassHandle holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
+
+ // Get the method's name and signature.
+ Symbol* name_sym = cpool->name_ref_at(index);
+ Symbol* sig_sym = cpool->signature_ref_at(index);
+
+ if (cpool->has_preresolution()
+ || (holder() == SystemDictionary::MethodHandle_klass() &&
+ MethodHandles::is_signature_polymorphic_name(holder(), name_sym))) {
+ // Short-circuit lookups for JSR 292-related call sites.
+ // That is, do not rely only on name-based lookups, because they may fail
+ // if the names are not resolvable in the boot class loader (7056328).
+ switch (bc) {
+ case Bytecodes::_invokevirtual:
+ case Bytecodes::_invokeinterface:
+ case Bytecodes::_invokespecial:
+ case Bytecodes::_invokestatic:
+ {
+ Method* m = ConstantPool::method_at_if_loaded(cpool, index);
+ if (m != NULL) {
+ return m;
+ }
+ }
+ break;
+ }
+ }
+
+ if (holder_is_accessible) { // Our declared holder is loaded.
+ instanceKlassHandle lookup = get_instance_klass_for_declared_method_holder(holder);
+ methodHandle m = lookup_method(accessor, lookup, name_sym, sig_sym, bc);
+ if (!m.is_null() &&
+ (bc == Bytecodes::_invokestatic
+ ? InstanceKlass::cast(m->method_holder())->is_not_initialized()
+ : !InstanceKlass::cast(m->method_holder())->is_loaded())) {
+ m = NULL;
+ }
+ if (!m.is_null()) {
+ // We found the method.
+ return m;
+ }
+ }
+
+ // Either the declared holder was not loaded, or the method could
+ // not be found.
+
+ return NULL;
+}
+
+// ------------------------------------------------------------------
+instanceKlassHandle JVMCIEnv::get_instance_klass_for_declared_method_holder(KlassHandle& method_holder) {
+ // For the case of <array>.clone(), the method holder can be an ArrayKlass*
+ // instead of an InstanceKlass*. For that case simply pretend that the
+ // declared holder is Object.clone since that's where the call will bottom out.
+ if (method_holder->oop_is_instance()) {
+ return instanceKlassHandle(method_holder());
+ } else if (method_holder->oop_is_array()) {
+ return instanceKlassHandle(SystemDictionary::Object_klass());
+ } else {
+ ShouldNotReachHere();
+ }
+ return NULL;
+}
+
+
+// ------------------------------------------------------------------
+methodHandle JVMCIEnv::get_method_by_index(constantPoolHandle& cpool,
+ int index, Bytecodes::Code bc,
+ instanceKlassHandle& accessor) {
+ ResourceMark rm;
+ return get_method_by_index_impl(cpool, index, bc, accessor);
+}
+
+// ------------------------------------------------------------------
+// Check for changes to the system dictionary during compilation
+// class loads, evolution, breakpoints
+JVMCIEnv::CodeInstallResult JVMCIEnv::check_for_system_dictionary_modification(Dependencies* dependencies, Handle compiled_code,
+ JVMCIEnv* env, char** failure_detail) {
+ // If JVMTI capabilities were enabled during compile, the compilation is invalidated.
+ if (env != NULL) {
+ if (!env->_jvmti_can_hotswap_or_post_breakpoint && JvmtiExport::can_hotswap_or_post_breakpoint()) {
+ *failure_detail = (char*) "Hotswapping or breakpointing was enabled during compilation";
+ return JVMCIEnv::dependencies_failed;
+ }
+ }
+
+ // Dependencies must be checked when the system dictionary changes
+ // or if we don't know whether it has changed (i.e., env == NULL).
+ // In debug mode, always check dependencies.
+ bool counter_changed = env != NULL && env->_system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
+ bool verify_deps = env == NULL || trueInDebug || JavaAssertions::enabled(SystemDictionary::HotSpotInstalledCode_klass()->name()->as_C_string(), true);
+ if (!counter_changed && !verify_deps) {
+ return JVMCIEnv::ok;
+ }
+
+ for (Dependencies::DepStream deps(dependencies); deps.next(); ) {
+ Klass* witness = deps.check_dependency();
+ if (witness != NULL) {
+ // Use a fixed size buffer to prevent the string stream from
+ // resizing in the context of an inner resource mark.
+ char* buffer = NEW_RESOURCE_ARRAY(char, O_BUFLEN);
+ stringStream st(buffer, O_BUFLEN);
+ deps.print_dependency(witness, true, &st);
+ *failure_detail = st.as_string();
+ if (env == NULL || counter_changed) {
+ return JVMCIEnv::dependencies_failed;
+ } else {
+ // The dependencies were invalid at the time of installation
+ // without any intervening modification of the system
+ // dictionary. That means they were invalidly constructed.
+ return JVMCIEnv::dependencies_invalid;
+ }
+ }
+ if (LogCompilation) {
+ deps.log_dependency();
+ }
+ }
+
+ return JVMCIEnv::ok;
+}
+
+// ------------------------------------------------------------------
+JVMCIEnv::CodeInstallResult JVMCIEnv::register_method(
+ methodHandle& method,
+ nmethod*& nm,
+ int entry_bci,
+ CodeOffsets* offsets,
+ int orig_pc_offset,
+ CodeBuffer* code_buffer,
+ int frame_words,
+ OopMapSet* oop_map_set,
+ ExceptionHandlerTable* handler_table,
+ AbstractCompiler* compiler,
+ DebugInformationRecorder* debug_info,
+ Dependencies* dependencies,
+ JVMCIEnv* env,
+ int compile_id,
+ bool has_unsafe_access,
+ bool has_wide_vector,
+ Handle installed_code,
+ Handle compiled_code,
+ Handle speculation_log) {
+ JVMCI_EXCEPTION_CONTEXT;
+ nm = NULL;
+ int comp_level = CompLevel_full_optimization;
+ char* failure_detail = NULL;
+ JVMCIEnv::CodeInstallResult result;
+ {
+ // To prevent compile queue updates.
+ MutexLocker locker(MethodCompileQueue_lock, THREAD);
+
+ // Prevent SystemDictionary::add_to_hierarchy from running
+ // and invalidating our dependencies until we install this method.
+ MutexLocker ml(Compile_lock);
+
+ // Encode the dependencies now, so we can check them right away.
+ dependencies->encode_content_bytes();
+
+ // Check for {class loads, evolution, breakpoints} during compilation
+ result = check_for_system_dictionary_modification(dependencies, compiled_code, env, &failure_detail);
+ if (result != JVMCIEnv::ok) {
+ // While not a true deoptimization, it is a preemptive decompile.
+ MethodData* mdp = method()->method_data();
+ if (mdp != NULL) {
+ mdp->inc_decompile_count();
+ if (mdp->decompile_count() > (uint)PerMethodRecompilationCutoff) {
+ // TODO (chaeubl) enable this in the fastdebug build only once we are more stable
+ ResourceMark m;
+ tty->print_cr("WARN: endless recompilation of %s. Method was set to not compilable.", method()->name_and_sig_as_C_string());
+ //ShouldNotReachHere();
+ }
+ }
+
+ // All buffers in the CodeBuffer are allocated in the CodeCache.
+ // If the code buffer is created on each compile attempt
+ // as in C2, then it must be freed.
+ //code_buffer->free_blob();
+ } else {
+ ImplicitExceptionTable implicit_tbl;
+ nm = nmethod::new_nmethod(method,
+ compile_id,
+ entry_bci,
+ offsets,
+ orig_pc_offset,
+ debug_info, dependencies, code_buffer,
+ frame_words, oop_map_set,
+ handler_table, &implicit_tbl,
+ compiler, comp_level, installed_code, speculation_log);
+
+ // Free codeBlobs
+ //code_buffer->free_blob();
+ if (nm == NULL) {
+ // The CodeCache is full. Print out warning and disable compilation.
+ {
+ MutexUnlocker ml(Compile_lock);
+ MutexUnlocker locker(MethodCompileQueue_lock);
+ CompileBroker::handle_full_code_cache(CodeCache::get_code_blob_type(comp_level));
+ }
+ } else {
+ nm->set_has_unsafe_access(has_unsafe_access);
+ nm->set_has_wide_vectors(has_wide_vector);
+
+ // Record successful registration.
+ // (Put nm into the task handle *before* publishing to the Java heap.)
+ CompileTask* task = env == NULL ? NULL : env->task();
+ if (task != NULL) task->set_code(nm);
+
+ if (installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(installed_code())) {
+ if (entry_bci == InvocationEntryBci) {
+ if (TieredCompilation) {
+ // If there is an old version we're done with it
+ nmethod* old = method->code();
+ if (TraceMethodReplacement && old != NULL) {
+ ResourceMark rm;
+ char *method_name = method->name_and_sig_as_C_string();
+ tty->print_cr("Replacing method %s", method_name);
+ }
+ if (old != NULL ) {
+ old->make_not_entrant();
+ }
+ }
+ if (TraceNMethodInstalls) {
+ ResourceMark rm;
+ char *method_name = method->name_and_sig_as_C_string();
+ ttyLocker ttyl;
+ tty->print_cr("Installing method (%d) %s [entry point: %p]",
+ comp_level,
+ method_name, nm->entry_point());
+ }
+ // Allow the code to be executed
+ method->set_code(method, nm);
+ } else {
+ if (TraceNMethodInstalls ) {
+ ResourceMark rm;
+ char *method_name = method->name_and_sig_as_C_string();
+ ttyLocker ttyl;
+ tty->print_cr("Installing osr method (%d) %s @ %d",
+ comp_level,
+ method_name,
+ entry_bci);
+ }
+ InstanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
+ }
+ }
+ }
+ result = nm != NULL ? JVMCIEnv::ok :JVMCIEnv::cache_full;
+ }
+ }
+
+ // String creation must be done outside lock
+ if (failure_detail != NULL) {
+ // A failure to allocate the string is silently ignored.
+ Handle message = java_lang_String::create_from_str(failure_detail, THREAD);
+ HotSpotCompiledNmethod::set_installationFailureMessage(compiled_code, message());
+ }
+
+ // JVMTI -- compiled method notification (must be done outside lock)
+ if (nm != NULL) {
+ nm->post_compiled_method_load_event();
+ }
+
+ return result;
+}
+