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src/hotspot/share/ci/ciMethod.hpp
367 строк
14 KB
Vladimir Ivanov
8188133: C2: Static field accesses in clinit can trigger deoptimizations
05 фев 2019, 04:35
05 фев 2019, 04:35
4846f5c
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/* * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_CI_CIMETHOD_HPP #define SHARE_VM_CI_CIMETHOD_HPP #include "ci/ciFlags.hpp" #include "ci/ciInstanceKlass.hpp" #include "ci/ciObject.hpp" #include "ci/ciSignature.hpp" #include "compiler/methodLiveness.hpp" #include "prims/methodHandles.hpp" #include "utilities/bitMap.hpp" class ciMethodBlocks; class MethodLiveness; class Arena; class BCEscapeAnalyzer; class InlineTree; // Whether profiling found an oop to be always, never or sometimes // null enum ProfilePtrKind { ProfileAlwaysNull, ProfileNeverNull, ProfileMaybeNull }; // ciMethod // // This class represents a Method* in the HotSpot virtual // machine. class ciMethod : public ciMetadata { friend class CompileBroker; CI_PACKAGE_ACCESS friend class ciEnv; friend class ciExceptionHandlerStream; friend class ciBytecodeStream; friend class ciMethodHandle; friend class ciReplay; friend class InlineTree; private: // General method information. ciFlags _flags; ciSymbol* _name; ciInstanceKlass* _holder; ciSignature* _signature; ciMethodData* _method_data; ciMethodBlocks* _method_blocks; // Code attributes. int _code_size; int _max_stack; int _max_locals; vmIntrinsics::ID _intrinsic_id; int _handler_count; int _nmethod_age; int _interpreter_invocation_count; int _interpreter_throwout_count; int _instructions_size; int _size_of_parameters; bool _uses_monitors; bool _balanced_monitors; bool _is_c1_compilable; bool _is_c2_compilable; bool _can_be_parsed; bool _can_be_statically_bound; bool _has_reserved_stack_access; // Lazy fields, filled in on demand address _code; ciExceptionHandler** _exception_handlers; // Optional liveness analyzer. MethodLiveness* _liveness; #if defined(COMPILER2) ciTypeFlow* _flow; BCEscapeAnalyzer* _bcea; #endif ciMethod(const methodHandle& h_m, ciInstanceKlass* holder); ciMethod(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature, ciInstanceKlass* accessor); oop loader() const { return _holder->loader(); } const char* type_string() { return "ciMethod"; } void print_impl(outputStream* st); void load_code(); bool ensure_method_data(const methodHandle& h_m); void code_at_put(int bci, Bytecodes::Code code) { Bytecodes::check(code); assert(0 <= bci && bci < code_size(), "valid bci"); address bcp = _code + bci; *bcp = code; } // Check bytecode and profile data collected are compatible void assert_virtual_call_type_ok(int bci); void assert_call_type_ok(int bci); public: void check_is_loaded() const { assert(is_loaded(), "not loaded"); } // Basic method information. ciFlags flags() const { check_is_loaded(); return _flags; } ciSymbol* name() const { return _name; } ciInstanceKlass* holder() const { return _holder; } ciMethodData* method_data(); ciMethodData* method_data_or_null(); // Signature information. ciSignature* signature() const { return _signature; } ciType* return_type() const { return _signature->return_type(); } int arg_size_no_receiver() const { return _signature->size(); } // Can only be used on loaded ciMethods int arg_size() const { check_is_loaded(); return _signature->size() + (_flags.is_static() ? 0 : 1); } // Report the number of elements on stack when invoking the current method. // If the method is loaded, arg_size() gives precise information about the // number of stack elements (using the method's signature and its flags). // However, if the method is not loaded, the number of stack elements must // be determined differently, as the method's flags are not yet available. // The invoke_arg_size() method assumes in that case that all bytecodes except // invokestatic and invokedynamic have a receiver that is also pushed onto the // stack by the caller of the current method. int invoke_arg_size(Bytecodes::Code code) const { if (is_loaded()) { return arg_size(); } else { int arg_size = _signature->size(); if (code != Bytecodes::_invokestatic && code != Bytecodes::_invokedynamic) { arg_size++; } return arg_size; } } Method* get_Method() const { Method* m = (Method*)_metadata; assert(m != NULL, "illegal use of unloaded method"); return m; } // Method code and related information. address code() { if (_code == NULL) load_code(); return _code; } int code_size() const { check_is_loaded(); return _code_size; } int max_stack() const { check_is_loaded(); return _max_stack; } int max_locals() const { check_is_loaded(); return _max_locals; } vmIntrinsics::ID intrinsic_id() const { check_is_loaded(); return _intrinsic_id; } bool has_exception_handlers() const { check_is_loaded(); return _handler_count > 0; } int exception_table_length() const { check_is_loaded(); return _handler_count; } int interpreter_invocation_count() const { check_is_loaded(); return _interpreter_invocation_count; } int interpreter_throwout_count() const { check_is_loaded(); return _interpreter_throwout_count; } int size_of_parameters() const { check_is_loaded(); return _size_of_parameters; } int nmethod_age() const { check_is_loaded(); return _nmethod_age; } // Should the method be compiled with an age counter? bool profile_aging() const; // Code size for inlining decisions. int code_size_for_inlining(); bool caller_sensitive() const { return get_Method()->caller_sensitive(); } bool force_inline() const { return get_Method()->force_inline(); } bool dont_inline() const { return get_Method()->dont_inline(); } bool intrinsic_candidate() const { return get_Method()->intrinsic_candidate(); } bool is_static_initializer() const { return get_Method()->is_static_initializer(); } int comp_level(); int highest_osr_comp_level(); Bytecodes::Code java_code_at_bci(int bci) { address bcp = code() + bci; return Bytecodes::java_code_at(NULL, bcp); } Bytecodes::Code raw_code_at_bci(int bci) { address bcp = code() + bci; return Bytecodes::code_at(NULL, bcp); } BCEscapeAnalyzer *get_bcea(); ciMethodBlocks *get_method_blocks(); bool has_linenumber_table() const; // length unknown until decompression u_char* compressed_linenumber_table() const; // not preserved by gc int line_number_from_bci(int bci) const; // Runtime information. int vtable_index(); address native_entry(); address interpreter_entry(); // Analysis and profiling. // // Usage note: liveness_at_bci and init_vars should be wrapped in ResourceMarks. bool has_monitor_bytecodes() const { return _uses_monitors; } bool has_balanced_monitors(); // Returns a bitmap indicating which locals are required to be // maintained as live for deopt. raw_liveness_at_bci is always the // direct output of the liveness computation while liveness_at_bci // may mark all locals as live to improve support for debugging Java // code by maintaining the state of as many locals as possible. MethodLivenessResult raw_liveness_at_bci(int bci); MethodLivenessResult liveness_at_bci(int bci); // Get the interpreters viewpoint on oop liveness. MethodLiveness is // conservative in the sense that it may consider locals to be live which // cannot be live, like in the case where a local could contain an oop or // a primitive along different paths. In that case the local must be // dead when those paths merge. Since the interpreter's viewpoint is // used when gc'ing an interpreter frame we need to use its viewpoint // during OSR when loading the locals. ResourceBitMap live_local_oops_at_bci(int bci); #ifdef COMPILER1 const BitMap& bci_block_start(); #endif ciTypeFlow* get_flow_analysis(); ciTypeFlow* get_osr_flow_analysis(int osr_bci); // alternate entry point ciCallProfile call_profile_at_bci(int bci); int interpreter_call_site_count(int bci); // Does type profiling provide any useful information at this point? bool argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind); bool parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind); bool return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind); ciField* get_field_at_bci( int bci, bool &will_link); ciMethod* get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature); ciMethod* get_method_at_bci(int bci) { bool ignored_will_link; ciSignature* ignored_declared_signature; return get_method_at_bci(bci, ignored_will_link, &ignored_declared_signature); } ciSignature* get_declared_signature_at_bci(int bci) { bool ignored_will_link; ciSignature* declared_signature; get_method_at_bci(bci, ignored_will_link, &declared_signature); assert(declared_signature != NULL, "cannot be null"); return declared_signature; } // Given a certain calling environment, find the monomorphic target // for the call. Return NULL if the call is not monomorphic in // its calling environment. ciMethod* find_monomorphic_target(ciInstanceKlass* caller, ciInstanceKlass* callee_holder, ciInstanceKlass* actual_receiver, bool check_access = true); // Given a known receiver klass, find the target for the call. // Return NULL if the call has no target or is abstract. ciMethod* resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access = true); // Find the proper vtable index to invoke this method. int resolve_vtable_index(ciKlass* caller, ciKlass* receiver); bool has_option(const char *option); bool has_option_value(const char* option, double& value); bool can_be_compiled(); bool can_be_parsed() const { return _can_be_parsed; } bool can_be_osr_compiled(int entry_bci); void set_not_compilable(const char* reason = NULL); bool has_compiled_code(); void log_nmethod_identity(xmlStream* log); bool is_not_reached(int bci); bool was_executed_more_than(int times); bool has_unloaded_classes_in_signature(); bool is_klass_loaded(int refinfo_index, bool must_be_resolved) const; bool check_call(int refinfo_index, bool is_static) const; bool ensure_method_data(); // make sure it exists in the VM also MethodCounters* ensure_method_counters(); int instructions_size(); int scale_count(int count, float prof_factor = 1.); // make MDO count commensurate with IIC // Stack walking support bool is_ignored_by_security_stack_walk() const; // JSR 292 support bool is_method_handle_intrinsic() const; bool is_compiled_lambda_form() const; bool has_member_arg() const; // What kind of ciObject is this? bool is_method() const { return true; } // Java access flags bool is_public () const { return flags().is_public(); } bool is_private () const { return flags().is_private(); } bool is_protected () const { return flags().is_protected(); } bool is_static () const { return flags().is_static(); } bool is_final () const { return flags().is_final(); } bool is_synchronized() const { return flags().is_synchronized(); } bool is_native () const { return flags().is_native(); } bool is_interface () const { return flags().is_interface(); } bool is_abstract () const { return flags().is_abstract(); } bool is_strict () const { return flags().is_strict(); } // Other flags bool is_empty_method() const; bool is_vanilla_constructor() const; bool is_final_method() const { return is_final() || holder()->is_final(); } bool has_loops () const; bool has_jsrs () const; bool is_getter () const; bool is_setter () const; bool is_accessor () const; bool is_initializer () const; bool can_be_statically_bound() const { return _can_be_statically_bound; } bool has_reserved_stack_access() const { return _has_reserved_stack_access; } bool is_boxing_method() const; bool is_unboxing_method() const; bool is_object_initializer() const; // Replay data methods void dump_name_as_ascii(outputStream* st); void dump_replay_data(outputStream* st); // Print the bytecodes of this method. void print_codes_on(outputStream* st); void print_codes() { print_codes_on(tty); } void print_codes_on(int from, int to, outputStream* st); // Print the name of this method in various incarnations. void print_name(outputStream* st = tty); void print_short_name(outputStream* st = tty); static bool is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method); }; #endif // SHARE_VM_CI_CIMETHOD_HPP