diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/oops/method.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/hotspot/share/oops/method.hpp Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,1183 @@ +/* + * Copyright (c) 1997, 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_OOPS_METHODOOP_HPP +#define SHARE_VM_OOPS_METHODOOP_HPP + +#include "classfile/vmSymbols.hpp" +#include "code/compressedStream.hpp" +#include "compiler/compilerDefinitions.hpp" +#include "compiler/oopMap.hpp" +#include "interpreter/invocationCounter.hpp" +#include "oops/annotations.hpp" +#include "oops/constantPool.hpp" +#include "oops/methodCounters.hpp" +#include "oops/instanceKlass.hpp" +#include "oops/oop.hpp" +#include "oops/typeArrayOop.hpp" +#include "utilities/accessFlags.hpp" +#include "utilities/align.hpp" +#include "utilities/growableArray.hpp" + +// A Method represents a Java method. +// +// Note that most applications load thousands of methods, so keeping the size of this +// class small has a big impact on footprint. +// +// Note that native_function and signature_handler have to be at fixed offsets +// (required by the interpreter) +// +// Method embedded field layout (after declared fields): +// [EMBEDDED native_function (present only if native) ] +// [EMBEDDED signature_handler (present only if native) ] + +class CheckedExceptionElement; +class LocalVariableTableElement; +class AdapterHandlerEntry; +class MethodData; +class MethodCounters; +class ConstMethod; +class InlineTableSizes; +class KlassSizeStats; +class CompiledMethod; + +class Method : public Metadata { + friend class VMStructs; + friend class JVMCIVMStructs; + private: + // If you add a new field that points to any metaspace object, you + // must add this field to Method::metaspace_pointers_do(). + ConstMethod* _constMethod; // Method read-only data. + MethodData* _method_data; + MethodCounters* _method_counters; + AccessFlags _access_flags; // Access flags + int _vtable_index; // vtable index of this method (see VtableIndexFlag) + // note: can have vtables with >2**16 elements (because of inheritance) + u2 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) + + // Flags + enum Flags { + _caller_sensitive = 1 << 0, + _force_inline = 1 << 1, + _dont_inline = 1 << 2, + _hidden = 1 << 3, + _has_injected_profile = 1 << 4, + _running_emcp = 1 << 5, + _intrinsic_candidate = 1 << 6, + _reserved_stack_access = 1 << 7 + }; + mutable u2 _flags; + + TRACE_DEFINE_FLAG; + +#ifndef PRODUCT + int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) +#endif + // Entry point for calling both from and to the interpreter. + address _i2i_entry; // All-args-on-stack calling convention + // Entry point for calling from compiled code, to compiled code if it exists + // or else the interpreter. + volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() + // The entry point for calling both from and to compiled code is + // "_code->entry_point()". Because of tiered compilation and de-opt, this + // field can come and go. It can transition from NULL to not-null at any + // time (whenever a compile completes). It can transition from not-null to + // NULL only at safepoints (because of a de-opt). + CompiledMethod* volatile _code; // Points to the corresponding piece of native code + volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry + +#if INCLUDE_AOT && defined(TIERED) + CompiledMethod* _aot_code; +#endif + + // Constructor + Method(ConstMethod* xconst, AccessFlags access_flags); + public: + + static Method* allocate(ClassLoaderData* loader_data, + int byte_code_size, + AccessFlags access_flags, + InlineTableSizes* sizes, + ConstMethod::MethodType method_type, + TRAPS); + + // CDS and vtbl checking can create an empty Method to get vtbl pointer. + Method(){} + + bool is_method() const volatile { return true; } + + void restore_unshareable_info(TRAPS); + + // accessors for instance variables + + ConstMethod* constMethod() const { return _constMethod; } + void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; } + + + static address make_adapters(const methodHandle& mh, TRAPS); + volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } + volatile address from_compiled_entry_no_trampoline() const; + volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } + + // access flag + AccessFlags access_flags() const { return _access_flags; } + void set_access_flags(AccessFlags flags) { _access_flags = flags; } + + // name + Symbol* name() const { return constants()->symbol_at(name_index()); } + int name_index() const { return constMethod()->name_index(); } + void set_name_index(int index) { constMethod()->set_name_index(index); } + + // signature + Symbol* signature() const { return constants()->symbol_at(signature_index()); } + int signature_index() const { return constMethod()->signature_index(); } + void set_signature_index(int index) { constMethod()->set_signature_index(index); } + + // generics support + Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); } + int generic_signature_index() const { return constMethod()->generic_signature_index(); } + void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } + + // annotations support + AnnotationArray* annotations() const { + return constMethod()->method_annotations(); + } + AnnotationArray* parameter_annotations() const { + return constMethod()->parameter_annotations(); + } + AnnotationArray* annotation_default() const { + return constMethod()->default_annotations(); + } + AnnotationArray* type_annotations() const { + return constMethod()->type_annotations(); + } + + // Helper routine: get klass name + "." + method name + signature as + // C string, for the purpose of providing more useful NoSuchMethodErrors + // and fatal error handling. The string is allocated in resource + // area if a buffer is not provided by the caller. + char* name_and_sig_as_C_string() const; + char* name_and_sig_as_C_string(char* buf, int size) const; + + // Static routine in the situations we don't have a Method* + static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature); + static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size); + + Bytecodes::Code java_code_at(int bci) const { + return Bytecodes::java_code_at(this, bcp_from(bci)); + } + Bytecodes::Code code_at(int bci) const { + return Bytecodes::code_at(this, bcp_from(bci)); + } + + // JVMTI breakpoints +#if !INCLUDE_JVMTI + Bytecodes::Code orig_bytecode_at(int bci) const { + ShouldNotReachHere(); + return Bytecodes::_shouldnotreachhere; + } + void set_orig_bytecode_at(int bci, Bytecodes::Code code) { + ShouldNotReachHere(); + }; + u2 number_of_breakpoints() const {return 0;} +#else // !INCLUDE_JVMTI + Bytecodes::Code orig_bytecode_at(int bci) const; + void set_orig_bytecode_at(int bci, Bytecodes::Code code); + void set_breakpoint(int bci); + void clear_breakpoint(int bci); + void clear_all_breakpoints(); + // Tracking number of breakpoints, for fullspeed debugging. + // Only mutated by VM thread. + u2 number_of_breakpoints() const { + MethodCounters* mcs = method_counters(); + if (mcs == NULL) { + return 0; + } else { + return mcs->number_of_breakpoints(); + } + } + void incr_number_of_breakpoints(TRAPS) { + MethodCounters* mcs = get_method_counters(CHECK); + if (mcs != NULL) { + mcs->incr_number_of_breakpoints(); + } + } + void decr_number_of_breakpoints(TRAPS) { + MethodCounters* mcs = get_method_counters(CHECK); + if (mcs != NULL) { + mcs->decr_number_of_breakpoints(); + } + } + // Initialization only + void clear_number_of_breakpoints() { + MethodCounters* mcs = method_counters(); + if (mcs != NULL) { + mcs->clear_number_of_breakpoints(); + } + } +#endif // !INCLUDE_JVMTI + + // index into InstanceKlass methods() array + // note: also used by jfr + u2 method_idnum() const { return constMethod()->method_idnum(); } + void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } + + u2 orig_method_idnum() const { return constMethod()->orig_method_idnum(); } + void set_orig_method_idnum(u2 idnum) { constMethod()->set_orig_method_idnum(idnum); } + + // code size + int code_size() const { return constMethod()->code_size(); } + + // method size in words + int method_size() const { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); } + + // constant pool for Klass* holding this method + ConstantPool* constants() const { return constMethod()->constants(); } + void set_constants(ConstantPool* c) { constMethod()->set_constants(c); } + + // max stack + // return original max stack size for method verification + int verifier_max_stack() const { return constMethod()->max_stack(); } + int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); } + void set_max_stack(int size) { constMethod()->set_max_stack(size); } + + // max locals + int max_locals() const { return constMethod()->max_locals(); } + void set_max_locals(int size) { constMethod()->set_max_locals(size); } + + int highest_comp_level() const; + void set_highest_comp_level(int level); + int highest_osr_comp_level() const; + void set_highest_osr_comp_level(int level); + +#if defined(COMPILER2) || INCLUDE_JVMCI + // Count of times method was exited via exception while interpreting + void interpreter_throwout_increment(TRAPS) { + MethodCounters* mcs = get_method_counters(CHECK); + if (mcs != NULL) { + mcs->interpreter_throwout_increment(); + } + } +#endif + + int interpreter_throwout_count() const { + MethodCounters* mcs = method_counters(); + if (mcs == NULL) { + return 0; + } else { + return mcs->interpreter_throwout_count(); + } + } + + // size of parameters + int size_of_parameters() const { return constMethod()->size_of_parameters(); } + void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); } + + bool has_stackmap_table() const { + return constMethod()->has_stackmap_table(); + } + + Array* stackmap_data() const { + return constMethod()->stackmap_data(); + } + + void set_stackmap_data(Array* sd) { + constMethod()->set_stackmap_data(sd); + } + + // exception handler table + bool has_exception_handler() const + { return constMethod()->has_exception_handler(); } + int exception_table_length() const + { return constMethod()->exception_table_length(); } + ExceptionTableElement* exception_table_start() const + { return constMethod()->exception_table_start(); } + + // Finds the first entry point bci of an exception handler for an + // exception of klass ex_klass thrown at throw_bci. A value of NULL + // for ex_klass indicates that the exception klass is not known; in + // this case it matches any constraint class. Returns -1 if the + // exception cannot be handled in this method. The handler + // constraint classes are loaded if necessary. Note that this may + // throw an exception if loading of the constraint classes causes + // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. + // If an exception is thrown, returns the bci of the + // exception handler which caused the exception to be thrown, which + // is needed for proper retries. See, for example, + // InterpreterRuntime::exception_handler_for_exception. + static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS); + + // method data access + MethodData* method_data() const { + return _method_data; + } + + void set_method_data(MethodData* data) { + // The store into method must be released. On platforms without + // total store order (TSO) the reference may become visible before + // the initialization of data otherwise. + OrderAccess::release_store_ptr((volatile void *)&_method_data, data); + } + + MethodCounters* method_counters() const { + return _method_counters; + } + + void clear_method_counters() { + _method_counters = NULL; + } + + bool init_method_counters(MethodCounters* counters) { + // Try to install a pointer to MethodCounters, return true on success. + return Atomic::cmpxchg_ptr(counters, (volatile void*)&_method_counters, NULL) == NULL; + } + +#ifdef TIERED + // We are reusing interpreter_invocation_count as a holder for the previous event count! + // We can do that since interpreter_invocation_count is not used in tiered. + int prev_event_count() const { + if (method_counters() == NULL) { + return 0; + } else { + return method_counters()->interpreter_invocation_count(); + } + } + void set_prev_event_count(int count) { + MethodCounters* mcs = method_counters(); + if (mcs != NULL) { + mcs->set_interpreter_invocation_count(count); + } + } + jlong prev_time() const { + MethodCounters* mcs = method_counters(); + return mcs == NULL ? 0 : mcs->prev_time(); + } + void set_prev_time(jlong time) { + MethodCounters* mcs = method_counters(); + if (mcs != NULL) { + mcs->set_prev_time(time); + } + } + float rate() const { + MethodCounters* mcs = method_counters(); + return mcs == NULL ? 0 : mcs->rate(); + } + void set_rate(float rate) { + MethodCounters* mcs = method_counters(); + if (mcs != NULL) { + mcs->set_rate(rate); + } + } + +#if INCLUDE_AOT + void set_aot_code(CompiledMethod* aot_code) { + _aot_code = aot_code; + } + + CompiledMethod* aot_code() const { + return _aot_code; + } +#else + CompiledMethod* aot_code() const { return NULL; } +#endif // INCLUDE_AOT +#endif // TIERED + + int nmethod_age() const { + if (method_counters() == NULL) { + return INT_MAX; + } else { + return method_counters()->nmethod_age(); + } + } + + int invocation_count(); + int backedge_count(); + + bool was_executed_more_than(int n); + bool was_never_executed() { return !was_executed_more_than(0); } + + static void build_interpreter_method_data(const methodHandle& method, TRAPS); + + static MethodCounters* build_method_counters(Method* m, TRAPS); + + int interpreter_invocation_count() { + if (TieredCompilation) { + return invocation_count(); + } else { + MethodCounters* mcs = method_counters(); + return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count(); + } + } +#if defined(COMPILER2) || INCLUDE_JVMCI + int increment_interpreter_invocation_count(TRAPS) { + if (TieredCompilation) ShouldNotReachHere(); + MethodCounters* mcs = get_method_counters(CHECK_0); + return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count(); + } +#endif + +#ifndef PRODUCT + int compiled_invocation_count() const { return _compiled_invocation_count; } + void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } +#else + // for PrintMethodData in a product build + int compiled_invocation_count() const { return 0; } +#endif // not PRODUCT + + // Clear (non-shared space) pointers which could not be relevant + // if this (shared) method were mapped into another JVM. + void remove_unshareable_info(); + + // nmethod/verified compiler entry + address verified_code_entry(); + bool check_code() const; // Not inline to avoid circular ref + CompiledMethod* volatile code() const { assert( check_code(), "" ); return (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code); } + void clear_code(bool acquire_lock = true); // Clear out any compiled code + static void set_code(const methodHandle& mh, CompiledMethod* code); + void set_adapter_entry(AdapterHandlerEntry* adapter) { + constMethod()->set_adapter_entry(adapter); + } + void update_adapter_trampoline(AdapterHandlerEntry* adapter) { + constMethod()->update_adapter_trampoline(adapter); + } + + address get_i2c_entry(); + address get_c2i_entry(); + address get_c2i_unverified_entry(); + AdapterHandlerEntry* adapter() const { + return constMethod()->adapter(); + } + // setup entry points + void link_method(const methodHandle& method, TRAPS); + // clear entry points. Used by sharing code during dump time + void unlink_method() NOT_CDS_RETURN; + + virtual void metaspace_pointers_do(MetaspaceClosure* iter); + virtual MetaspaceObj::Type type() const { return MethodType; } + + // vtable index + enum VtableIndexFlag { + // Valid vtable indexes are non-negative (>= 0). + // These few negative values are used as sentinels. + itable_index_max = -10, // first itable index, growing downward + pending_itable_index = -9, // itable index will be assigned + invalid_vtable_index = -4, // distinct from any valid vtable index + garbage_vtable_index = -3, // not yet linked; no vtable layout yet + nonvirtual_vtable_index = -2 // there is no need for vtable dispatch + // 6330203 Note: Do not use -1, which was overloaded with many meanings. + }; + DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) + bool has_vtable_index() const { return _vtable_index >= 0; } + int vtable_index() const { return _vtable_index; } + void set_vtable_index(int index); + DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; }) + bool has_itable_index() const { return _vtable_index <= itable_index_max; } + int itable_index() const { assert(valid_itable_index(), ""); + return itable_index_max - _vtable_index; } + void set_itable_index(int index); + + // interpreter entry + address interpreter_entry() const { return _i2i_entry; } + // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry + void set_interpreter_entry(address entry) { + assert(!is_shared(), "shared method's interpreter entry should not be changed at run time"); + if (_i2i_entry != entry) { + _i2i_entry = entry; + } + if (_from_interpreted_entry != entry) { + _from_interpreted_entry = entry; + } + } + + // native function (used for native methods only) + enum { + native_bind_event_is_interesting = true + }; + address native_function() const { return *(native_function_addr()); } + address critical_native_function(); + + // Must specify a real function (not NULL). + // Use clear_native_function() to unregister. + void set_native_function(address function, bool post_event_flag); + bool has_native_function() const; + void clear_native_function(); + + // signature handler (used for native methods only) + address signature_handler() const { return *(signature_handler_addr()); } + void set_signature_handler(address handler); + + // Interpreter oopmap support + void mask_for(int bci, InterpreterOopMap* mask); + + // operations on invocation counter + void print_invocation_count(); + + // byte codes + void set_code(address code) { return constMethod()->set_code(code); } + address code_base() const { return constMethod()->code_base(); } + bool contains(address bcp) const { return constMethod()->contains(bcp); } + + // prints byte codes + void print_codes() const { print_codes_on(tty); } + void print_codes_on(outputStream* st) const; + void print_codes_on(int from, int to, outputStream* st) const; + + // method parameters + bool has_method_parameters() const + { return constMethod()->has_method_parameters(); } + int method_parameters_length() const + { return constMethod()->method_parameters_length(); } + MethodParametersElement* method_parameters_start() const + { return constMethod()->method_parameters_start(); } + + // checked exceptions + int checked_exceptions_length() const + { return constMethod()->checked_exceptions_length(); } + CheckedExceptionElement* checked_exceptions_start() const + { return constMethod()->checked_exceptions_start(); } + + // localvariable table + bool has_localvariable_table() const + { return constMethod()->has_localvariable_table(); } + int localvariable_table_length() const + { return constMethod()->localvariable_table_length(); } + LocalVariableTableElement* localvariable_table_start() const + { return constMethod()->localvariable_table_start(); } + + bool has_linenumber_table() const + { return constMethod()->has_linenumber_table(); } + u_char* compressed_linenumber_table() const + { return constMethod()->compressed_linenumber_table(); } + + // method holder (the Klass* holding this method) + InstanceKlass* method_holder() const { return constants()->pool_holder(); } + + void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) + Symbol* klass_name() const; // returns the name of the method holder + BasicType result_type() const; // type of the method result + bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } + bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } + + // Checked exceptions thrown by this method (resolved to mirrors) + objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } + + // Access flags + bool is_public() const { return access_flags().is_public(); } + bool is_private() const { return access_flags().is_private(); } + bool is_protected() const { return access_flags().is_protected(); } + bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } + bool is_static() const { return access_flags().is_static(); } + bool is_final() const { return access_flags().is_final(); } + bool is_synchronized() const { return access_flags().is_synchronized();} + bool is_native() const { return access_flags().is_native(); } + bool is_abstract() const { return access_flags().is_abstract(); } + bool is_strict() const { return access_flags().is_strict(); } + bool is_synthetic() const { return access_flags().is_synthetic(); } + + // returns true if contains only return operation + bool is_empty_method() const; + + // returns true if this is a vanilla constructor + bool is_vanilla_constructor() const; + + // checks method and its method holder + bool is_final_method() const; + bool is_final_method(AccessFlags class_access_flags) const; + // interface method declared with 'default' - excludes private interface methods + bool is_default_method() const; + + // true if method needs no dynamic dispatch (final and/or no vtable entry) + bool can_be_statically_bound() const; + bool can_be_statically_bound(AccessFlags class_access_flags) const; + + // returns true if the method has any backward branches. + bool has_loops() { + return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); + }; + + bool compute_has_loops_flag(); + + bool has_jsrs() { + return access_flags().has_jsrs(); + }; + void set_has_jsrs() { + _access_flags.set_has_jsrs(); + } + + // returns true if the method has any monitors. + bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } + bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } + + void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } + + // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes + // propererly nest in the method. It might return false, even though they actually nest properly, since the info. + // has not been computed yet. + bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } + void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } + + // returns true if the method is an accessor function (setter/getter). + bool is_accessor() const; + + // returns true if the method is a getter + bool is_getter() const; + + // returns true if the method is a setter + bool is_setter() const; + + // returns true if the method does nothing but return a constant of primitive type + bool is_constant_getter() const; + + // returns true if the method is an initializer ( or ). + bool is_initializer() const; + + // returns true if the method is static OR if the classfile version < 51 + bool has_valid_initializer_flags() const; + + // returns true if the method name is and the method has + // valid static initializer flags. + bool is_static_initializer() const; + + // returns true if the method name is + bool is_object_initializer() const; + + // compiled code support + // NOTE: code() is inherently racy as deopt can be clearing code + // simultaneously. Use with caution. + bool has_compiled_code() const { return code() != NULL; } + +#ifdef TIERED + bool has_aot_code() const { return aot_code() != NULL; } +#endif + + // sizing + static int header_size() { + return align_up((int)sizeof(Method), wordSize) / wordSize; + } + static int size(bool is_native); + int size() const { return method_size(); } +#if INCLUDE_SERVICES + void collect_statistics(KlassSizeStats *sz) const; +#endif + void log_touched(TRAPS); + static void print_touched_methods(outputStream* out); + + // interpreter support + static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); } + static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); } + static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); } + static ByteSize code_offset() { return byte_offset_of(Method, _code); } + static ByteSize method_data_offset() { + return byte_offset_of(Method, _method_data); + } + static ByteSize method_counters_offset() { + return byte_offset_of(Method, _method_counters); + } +#ifndef PRODUCT + static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); } +#endif // not PRODUCT + static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); } + static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); } + static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); } + static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); } + + // for code generation + static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); } + static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); } + static int intrinsic_id_size_in_bytes() { return sizeof(u2); } + + // Static methods that are used to implement member methods where an exposed this pointer + // is needed due to possible GCs + static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS); + + // Returns the byte code index from the byte code pointer + int bci_from(address bcp) const; + address bcp_from(int bci) const; + address bcp_from(address bcp) const; + int validate_bci_from_bcp(address bcp) const; + int validate_bci(int bci) const; + + // Returns the line number for a bci if debugging information for the method is prowided, + // -1 is returned otherwise. + int line_number_from_bci(int bci) const; + + // Reflection support + bool is_overridden_in(Klass* k) const; + + // Stack walking support + bool is_ignored_by_security_stack_walk() const; + + // JSR 292 support + bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id) + bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm + bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc. + static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual + Symbol* signature, //anything at all + TRAPS); + static Klass* check_non_bcp_klass(Klass* klass); + + enum { + // How many extra stack entries for invokedynamic + extra_stack_entries_for_jsr292 = 1 + }; + + // this operates only on invoke methods: + // presize interpreter frames for extra interpreter stack entries, if needed + // Account for the extra appendix argument for invokehandle/invokedynamic + static int extra_stack_entries() { return extra_stack_entries_for_jsr292; } + static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize + + // RedefineClasses() support: + bool is_old() const { return access_flags().is_old(); } + void set_is_old() { _access_flags.set_is_old(); } + bool is_obsolete() const { return access_flags().is_obsolete(); } + void set_is_obsolete() { _access_flags.set_is_obsolete(); } + bool is_deleted() const { return access_flags().is_deleted(); } + void set_is_deleted() { _access_flags.set_is_deleted(); } + + bool is_running_emcp() const { + // EMCP methods are old but not obsolete or deleted. Equivalent + // Modulo Constant Pool means the method is equivalent except + // the constant pool and instructions that access the constant + // pool might be different. + // If a breakpoint is set in a redefined method, its EMCP methods that are + // still running must have a breakpoint also. + return (_flags & _running_emcp) != 0; + } + + void set_running_emcp(bool x) { + _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp); + } + + bool on_stack() const { return access_flags().on_stack(); } + void set_on_stack(const bool value); + + // see the definition in Method*.cpp for the gory details + bool should_not_be_cached() const; + + // JVMTI Native method prefixing support: + bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } + void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } + + // Rewriting support + static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length, + u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); + + // jmethodID handling + // Because the useful life-span of a jmethodID cannot be determined, + // once created they are never reclaimed. The methods to which they refer, + // however, can be GC'ed away if the class is unloaded or if the method is + // made obsolete or deleted -- in these cases, the jmethodID + // refers to NULL (as is the case for any weak reference). + static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh); + static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid); + + // Ensure there is enough capacity in the internal tracking data + // structures to hold the number of jmethodIDs you plan to generate. + // This saves substantial time doing allocations. + static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity); + + // Use resolve_jmethod_id() in situations where the caller is expected + // to provide a valid jmethodID; the only sanity checks are in asserts; + // result guaranteed not to be NULL. + inline static Method* resolve_jmethod_id(jmethodID mid) { + assert(mid != NULL, "JNI method id should not be null"); + return *((Method**)mid); + } + + // Use checked_resolve_jmethod_id() in situations where the caller + // should provide a valid jmethodID, but might not. NULL is returned + // when the jmethodID does not refer to a valid method. + static Method* checked_resolve_jmethod_id(jmethodID mid); + + static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method); + static bool is_method_id(jmethodID mid); + + // Clear methods + static void clear_jmethod_ids(ClassLoaderData* loader_data); + static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN; + + // Get this method's jmethodID -- allocate if it doesn't exist + jmethodID jmethod_id() { return method_holder()->get_jmethod_id(this); } + + // Lookup the jmethodID for this method. Return NULL if not found. + // NOTE that this function can be called from a signal handler + // (see AsyncGetCallTrace support for Forte Analyzer) and this + // needs to be async-safe. No allocation should be done and + // so handles are not used to avoid deadlock. + jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); } + + // Support for inlining of intrinsic methods + vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } + void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u2) id; } + + // Helper routines for intrinsic_id() and vmIntrinsics::method(). + void init_intrinsic_id(); // updates from _none if a match + static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder); + + bool caller_sensitive() { + return (_flags & _caller_sensitive) != 0; + } + void set_caller_sensitive(bool x) { + _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive); + } + + bool force_inline() { + return (_flags & _force_inline) != 0; + } + void set_force_inline(bool x) { + _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline); + } + + bool dont_inline() { + return (_flags & _dont_inline) != 0; + } + void set_dont_inline(bool x) { + _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline); + } + + bool is_hidden() { + return (_flags & _hidden) != 0; + } + void set_hidden(bool x) { + _flags = x ? (_flags | _hidden) : (_flags & ~_hidden); + } + + bool intrinsic_candidate() { + return (_flags & _intrinsic_candidate) != 0; + } + void set_intrinsic_candidate(bool x) { + _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate); + } + + bool has_injected_profile() { + return (_flags & _has_injected_profile) != 0; + } + void set_has_injected_profile(bool x) { + _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile); + } + + bool has_reserved_stack_access() { + return (_flags & _reserved_stack_access) != 0; + } + + void set_has_reserved_stack_access(bool x) { + _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access); + } + + TRACE_DEFINE_FLAG_ACCESSOR; + + ConstMethod::MethodType method_type() const { + return _constMethod->method_type(); + } + bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; } + + // On-stack replacement support + bool has_osr_nmethod(int level, bool match_level) { + return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; + } + + int mark_osr_nmethods() { + return method_holder()->mark_osr_nmethods(this); + } + + nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { + return method_holder()->lookup_osr_nmethod(this, bci, level, match_level); + } + + // Inline cache support + void cleanup_inline_caches(); + + // Find if klass for method is loaded + bool is_klass_loaded_by_klass_index(int klass_index) const; + bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; + + // Indicates whether compilation failed earlier for this method, or + // whether it is not compilable for another reason like having a + // breakpoint set in it. + bool is_not_compilable(int comp_level = CompLevel_any) const; + void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL); + void set_not_compilable_quietly(int comp_level = CompLevel_all) { + set_not_compilable(comp_level, false); + } + bool is_not_osr_compilable(int comp_level = CompLevel_any) const; + void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL); + void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) { + set_not_osr_compilable(comp_level, false); + } + bool is_always_compilable() const; + + private: + void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason); + + public: + MethodCounters* get_method_counters(TRAPS) { + if (_method_counters == NULL) { + build_method_counters(this, CHECK_AND_CLEAR_NULL); + } + return _method_counters; + } + + bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } + void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } + void clear_not_c1_compilable() { _access_flags.clear_not_c1_compilable(); } + bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } + void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } + void clear_not_c2_compilable() { _access_flags.clear_not_c2_compilable(); } + + bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit + void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit + void clear_not_c1_osr_compilable() { clear_not_c1_compilable(); } // don't waste an accessFlags bit + bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); } + void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); } + void clear_not_c2_osr_compilable() { _access_flags.clear_not_c2_osr_compilable(); } + + // Background compilation support + bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } + void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } + void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } + + // Resolve all classes in signature, return 'true' if successful + static bool load_signature_classes(const methodHandle& m, TRAPS); + + // Return if true if not all classes references in signature, including return type, has been loaded + static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS); + + // Printing + void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM +#if INCLUDE_JVMTI + void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses +#else + void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)" +#endif + + // Helper routine used for method sorting + static void sort_methods(Array* methods, bool idempotent = false, bool set_idnums = true); + + // Deallocation function for redefine classes or if an error occurs + void deallocate_contents(ClassLoaderData* loader_data); + + // Printing +#ifndef PRODUCT + void print_on(outputStream* st) const; +#endif + void print_value_on(outputStream* st) const; + void print_linkage_flags(outputStream* st) PRODUCT_RETURN; + + const char* internal_name() const { return "{method}"; } + + // Check for valid method pointer + static bool has_method_vptr(const void* ptr); + bool is_valid_method() const; + + // Verify + void verify() { verify_on(tty); } + void verify_on(outputStream* st); + + private: + + // Inlined elements + address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } + address* signature_handler_addr() const { return native_function_addr() + 1; } +}; + + +// Utility class for compressing line number tables + +class CompressedLineNumberWriteStream: public CompressedWriteStream { + private: + int _bci; + int _line; + public: + // Constructor + CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} + CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} + + // Write (bci, line number) pair to stream + void write_pair_regular(int bci_delta, int line_delta); + + inline void write_pair_inline(int bci, int line) { + int bci_delta = bci - _bci; + int line_delta = line - _line; + _bci = bci; + _line = line; + // Skip (0,0) deltas - they do not add information and conflict with terminator. + if (bci_delta == 0 && line_delta == 0) return; + // Check if bci is 5-bit and line number 3-bit unsigned. + if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { + // Compress into single byte. + jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; + // Check that value doesn't match escape character. + if (value != 0xFF) { + write_byte(value); + return; + } + } + write_pair_regular(bci_delta, line_delta); + } + +// Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. +// Disabling optimization doesn't work for methods in header files +// so we force it to call through the non-optimized version in the .cpp. +// It's gross, but it's the only way we can ensure that all callers are +// fixed. _MSC_VER is defined by the windows compiler +#if defined(_M_AMD64) && _MSC_VER >= 1400 + void write_pair(int bci, int line); +#else + void write_pair(int bci, int line) { write_pair_inline(bci, line); } +#endif + + // Write end-of-stream marker + void write_terminator() { write_byte(0); } +}; + + +// Utility class for decompressing line number tables + +class CompressedLineNumberReadStream: public CompressedReadStream { + private: + int _bci; + int _line; + public: + // Constructor + CompressedLineNumberReadStream(u_char* buffer); + // Read (bci, line number) pair from stream. Returns false at end-of-stream. + bool read_pair(); + // Accessing bci and line number (after calling read_pair) + int bci() const { return _bci; } + int line() const { return _line; } +}; + + +#if INCLUDE_JVMTI + +/// Fast Breakpoints. + +// If this structure gets more complicated (because bpts get numerous), +// move it into its own header. + +// There is presently no provision for concurrent access +// to breakpoint lists, which is only OK for JVMTI because +// breakpoints are written only at safepoints, and are read +// concurrently only outside of safepoints. + +class BreakpointInfo : public CHeapObj { + friend class VMStructs; + private: + Bytecodes::Code _orig_bytecode; + int _bci; + u2 _name_index; // of method + u2 _signature_index; // of method + BreakpointInfo* _next; // simple storage allocation + + public: + BreakpointInfo(Method* m, int bci); + + // accessors + Bytecodes::Code orig_bytecode() { return _orig_bytecode; } + void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } + int bci() { return _bci; } + + BreakpointInfo* next() const { return _next; } + void set_next(BreakpointInfo* n) { _next = n; } + + // helps for searchers + bool match(const Method* m, int bci) { + return bci == _bci && match(m); + } + + bool match(const Method* m) { + return _name_index == m->name_index() && + _signature_index == m->signature_index(); + } + + void set(Method* method); + void clear(Method* method); +}; + +#endif // INCLUDE_JVMTI + +// Utility class for access exception handlers +class ExceptionTable : public StackObj { + private: + ExceptionTableElement* _table; + u2 _length; + + public: + ExceptionTable(const Method* m) { + if (m->has_exception_handler()) { + _table = m->exception_table_start(); + _length = m->exception_table_length(); + } else { + _table = NULL; + _length = 0; + } + } + + int length() const { + return _length; + } + + u2 start_pc(int idx) const { + assert(idx < _length, "out of bounds"); + return _table[idx].start_pc; + } + + void set_start_pc(int idx, u2 value) { + assert(idx < _length, "out of bounds"); + _table[idx].start_pc = value; + } + + u2 end_pc(int idx) const { + assert(idx < _length, "out of bounds"); + return _table[idx].end_pc; + } + + void set_end_pc(int idx, u2 value) { + assert(idx < _length, "out of bounds"); + _table[idx].end_pc = value; + } + + u2 handler_pc(int idx) const { + assert(idx < _length, "out of bounds"); + return _table[idx].handler_pc; + } + + void set_handler_pc(int idx, u2 value) { + assert(idx < _length, "out of bounds"); + _table[idx].handler_pc = value; + } + + u2 catch_type_index(int idx) const { + assert(idx < _length, "out of bounds"); + return _table[idx].catch_type_index; + } + + void set_catch_type_index(int idx, u2 value) { + assert(idx < _length, "out of bounds"); + _table[idx].catch_type_index = value; + } +}; + +#endif // SHARE_VM_OOPS_METHODOOP_HPP