diff -r caf5eb7dd4a7 -r 882756847a04 hotspot/src/share/vm/oops/method.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hotspot/src/share/vm/oops/method.hpp Sat Sep 01 13:25:18 2012 -0400 @@ -0,0 +1,976 @@ +/* + * Copyright (c) 1997, 2012, 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/oopMap.hpp" +#include "interpreter/invocationCounter.hpp" +#include "oops/annotations.hpp" +#include "oops/constMethod.hpp" +#include "oops/constantPool.hpp" +#include "oops/instanceKlass.hpp" +#include "oops/oop.hpp" +#include "oops/typeArrayOop.hpp" +#include "utilities/accessFlags.hpp" +#include "utilities/growableArray.hpp" + +// A Method* represents a Java method. +// +// Memory layout (each line represents a word). Note that most applications load thousands of methods, +// so keeping the size of this structure small has a big impact on footprint. +// +// We put all oops and method_size first for better gc cache locality. +// +// The actual bytecodes are inlined after the end of the Method struct. +// +// There are bits in the access_flags telling whether inlined tables are present. +// Note that accessing the line number and local variable tables is not performance critical at all. +// Accessing the checked exceptions table is used by reflection, so we put that last to make access +// to it fast. +// +// The line number table is compressed and inlined following the byte codes. It is found as the first +// byte following the byte codes. The checked exceptions table and the local variable table are inlined +// after the line number table, and indexed from the end of the method. We do not compress the checked +// exceptions table since the average length is less than 2, and do not bother to compress the local +// variable table either since it is mostly absent. +// +// Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter) +// +// |------------------------------------------------------| +// | header | +// | klass | +// |------------------------------------------------------| +// | ConstMethod* (oop) | +// |------------------------------------------------------| +// | methodData (oop) | +// | interp_invocation_count | +// |------------------------------------------------------| +// | access_flags | +// | vtable_index | +// |------------------------------------------------------| +// | result_index (C++ interpreter only) | +// |------------------------------------------------------| +// | method_size | max_stack | +// | max_locals | size_of_parameters | +// |------------------------------------------------------| +// |intrinsic_id| flags | throwout_count | +// |------------------------------------------------------| +// | num_breakpoints | (unused) | +// |------------------------------------------------------| +// | invocation_counter | +// | backedge_counter | +// |------------------------------------------------------| +// | prev_time (tiered only, 64 bit wide) | +// | | +// |------------------------------------------------------| +// | rate (tiered) | +// |------------------------------------------------------| +// | code (pointer) | +// | i2i (pointer) | +// | adapter (pointer) | +// | from_compiled_entry (pointer) | +// | from_interpreted_entry (pointer) | +// |------------------------------------------------------| +// | native_function (present only if native) | +// | signature_handler (present only if native) | +// |------------------------------------------------------| + + +class CheckedExceptionElement; +class LocalVariableTableElement; +class AdapterHandlerEntry; +class MethodData; + +class Method : public Metadata { + friend class VMStructs; + private: + ConstMethod* _constMethod; // Method read-only data. + MethodData* _method_data; + int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) + 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) +#ifdef CC_INTERP + int _result_index; // C++ interpreter needs for converting results to/from stack +#endif + u2 _method_size; // size of this object + u2 _max_stack; // Maximum number of entries on the expression stack + u2 _max_locals; // Number of local variables used by this method + u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words + u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) + u1 _jfr_towrite : 1, // Flags + _force_inline : 1, + _hidden : 1, + _dont_inline : 1, + : 4; + u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting + u2 _number_of_breakpoints; // fullspeed debugging support + InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations + InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations + +#ifdef TIERED + jlong _prev_time; // Previous time the rate was acquired + float _rate; // Events (invocation and backedge counter increments) per millisecond +#endif + +#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 + // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked. + AdapterHandlerEntry* _adapter; + // 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). + nmethod* volatile _code; // Points to the corresponding piece of native code + volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry + + // Constructor + Method(ConstMethod* xconst, AccessFlags access_flags, int size); + public: + static Method* allocate(ClassLoaderData* loader_data, + int byte_code_size, + AccessFlags access_flags, + int compressed_line_number_size, + int localvariable_table_length, + int exception_table_length, + int checked_exceptions_length, + TRAPS); + + Method() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } + bool is_method() const volatile { return true; } + + // accessors for instance variables + ConstMethod* constMethod() const { return _constMethod; } + void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; } + + + static address make_adapters(methodHandle mh, TRAPS); + volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } + 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 { + InstanceKlass* ik = InstanceKlass::cast(method_holder()); + if (ik->annotations() == NULL) { + return NULL; + } + return ik->annotations()->get_method_annotations_of(method_idnum()); + } + AnnotationArray* parameter_annotations() const { + InstanceKlass* ik = InstanceKlass::cast(method_holder()); + if (ik->annotations() == NULL) { + return NULL; + } + return ik->annotations()->get_method_parameter_annotations_of(method_idnum()); + } + AnnotationArray* annotation_default() const { + InstanceKlass* ik = InstanceKlass::cast(method_holder()); + if (ik->annotations() == NULL) { + return NULL; + } + return ik->annotations()->get_method_default_annotations_of(method_idnum()); + } + +#ifdef CC_INTERP + void set_result_index(BasicType type); + int result_index() { return _result_index; } +#endif + + // 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 + 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 { return _number_of_breakpoints; } + void incr_number_of_breakpoints() { ++_number_of_breakpoints; } + void decr_number_of_breakpoints() { --_number_of_breakpoints; } + // Initialization only + void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } + + // 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); } + + // code size + int code_size() const { return constMethod()->code_size(); } + + // method size + int method_size() const { return _method_size; } + void set_method_size(int size) { + assert(0 <= size && size < (1 << 16), "invalid method size"); + _method_size = size; + } + + // 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 _max_stack; } + int max_stack() const { return _max_stack + extra_stack_entries(); } + void set_max_stack(int size) { _max_stack = size; } + + // max locals + int max_locals() const { return _max_locals; } + void set_max_locals(int size) { _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); + + // Count of times method was exited via exception while interpreting + void interpreter_throwout_increment() { + if (_interpreter_throwout_count < 65534) { + _interpreter_throwout_count++; + } + } + + int interpreter_throwout_count() const { return _interpreter_throwout_count; } + void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; } + + // size of parameters + int size_of_parameters() const { return _size_of_parameters; } + + 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. + int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS); + + // method data access + MethodData* method_data() const { + return _method_data; + } + void set_method_data(MethodData* data) { + _method_data = data; + } + + // invocation counter + InvocationCounter* invocation_counter() { return &_invocation_counter; } + InvocationCounter* backedge_counter() { return &_backedge_counter; } + +#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 { return _interpreter_invocation_count; } + void set_prev_event_count(int count) { _interpreter_invocation_count = count; } + jlong prev_time() const { return _prev_time; } + void set_prev_time(jlong time) { _prev_time = time; } + float rate() const { return _rate; } + void set_rate(float rate) { _rate = rate; } +#endif + + 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(methodHandle method, TRAPS); + + int interpreter_invocation_count() { + if (TieredCompilation) return invocation_count(); + else return _interpreter_invocation_count; + } + void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; } + int increment_interpreter_invocation_count() { + if (TieredCompilation) ShouldNotReachHere(); + return ++_interpreter_invocation_count; + } + +#ifndef PRODUCT + int compiled_invocation_count() const { return _compiled_invocation_count; } + void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } +#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 + nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } + void clear_code(); // Clear out any compiled code + static void set_code(methodHandle mh, nmethod* code); + void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } + address get_i2c_entry(); + address get_c2i_entry(); + address get_c2i_unverified_entry(); + AdapterHandlerEntry* adapter() { return _adapter; } + // setup entry points + void link_method(methodHandle method, TRAPS); + // clear entry points. Used by sharing code + void unlink_method(); + + // vtable index + enum VtableIndexFlag { + // Valid vtable indexes are non-negative (>= 0). + // These few negative values are used as sentinels. + highest_unused_vtable_index_value = -5, + 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; }) + int vtable_index() const { assert(valid_vtable_index(), ""); + return _vtable_index; } + void set_vtable_index(int index) { _vtable_index = 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) { _i2i_entry = entry; _from_interpreted_entry = entry; } + int interpreter_kind(void) { + return constMethod()->interpreter_kind(); + } + void set_interpreter_kind(); + void set_interpreter_kind(int kind) { + constMethod()->set_interpreter_kind(kind); + } + + // 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); + +#ifndef PRODUCT + // operations on invocation counter + void print_invocation_count(); +#endif + + // 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 PRODUCT_RETURN; + void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; + + // 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) + Klass* 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 + int result_type_index() const; // type index 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_strict_method() const; + + // true if method needs no dynamic dispatch (final and/or no vtable entry) + bool can_be_statically_bound() 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 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; + + // 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; } + + // sizing + static int header_size() { return sizeof(Method)/HeapWordSize; } + static int size(bool is_native); + int size() const { return method_size(); } + + // interpreter support + static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); } + static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); } +#ifdef CC_INTERP + static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); } +#endif /* CC_INTERP */ + static ByteSize size_of_locals_offset() { return byte_offset_of(Method, _max_locals ); } + static ByteSize size_of_parameters_offset() { return byte_offset_of(Method, _size_of_parameters); } + 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 invocation_counter_offset() { return byte_offset_of(Method, _invocation_counter); } + static ByteSize backedge_counter_offset() { return byte_offset_of(Method, _backedge_counter); } + static ByteSize method_data_offset() { + return byte_offset_of(Method, _method_data); + } + static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(Method, _interpreter_invocation_count); } +#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); } + static ByteSize max_stack_offset() { return byte_offset_of(Method, _max_stack ); } + + // for code generation + static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); } + static int interpreter_invocation_counter_offset_in_bytes() + { return offset_of(Method, _interpreter_invocation_count); } + static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); } + static int intrinsic_id_size_in_bytes() { return sizeof(u1); } + + // 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* this_oop, TRAPS); + + // Returns the byte code index from the byte code pointer + int bci_from(address bcp) const; + address bcp_from(int bci) const; + int validate_bci_from_bcx(intptr_t bcx) 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; + + // 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); + // these operate only on invoke methods: + // presize interpreter frames for extra interpreter stack entries, if needed + // method handles want to be able to push a few extra values (e.g., a bound receiver), and + // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist, + // all without checking for a stack overflow + static int extra_stack_entries() { return EnableInvokeDynamic ? 2 : 0; } + 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 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(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); + + // 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() { methodHandle this_h(this); + return InstanceKlass::get_jmethod_id(InstanceKlass::cast(method_holder()), this_h); } + + // 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 InstanceKlass::cast(method_holder())->jmethod_id_or_null(this); } + + // JNI static invoke cached itable index accessors + int cached_itable_index() { return InstanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); } + void set_cached_itable_index(int index) { InstanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); } + + // 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 = (u1) 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(Klass* holder); + + bool jfr_towrite() { return _jfr_towrite; } + void set_jfr_towrite(bool towrite) { _jfr_towrite = towrite; } + + bool force_inline() { return _force_inline; } + void set_force_inline(bool x) { _force_inline = x; } + bool dont_inline() { return _dont_inline; } + void set_dont_inline(bool x) { _dont_inline = x; } + bool is_hidden() { return _hidden; } + void set_hidden(bool x) { _hidden = x; } + + // On-stack replacement support + bool has_osr_nmethod(int level, bool match_level) { + return InstanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; + } + + nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { + return InstanceKlass::cast(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); + 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 { + return is_not_compilable(comp_level) || access_flags().is_not_osr_compilable(); + } + void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); } + bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } + void set_not_c1_compilable() { _access_flags.set_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(); } + + // 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(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(methodHandle m, TRAPS); + + // Printing + void print_short_name(outputStream* st = tty) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM + void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)" + + // Helper routine used for method sorting + static void sort_methods(Array* methods, + Array* methods_annotations, + Array* methods_parameter_annotations, + Array* methods_default_annotations, + bool idempotent = false); + + // size of parameters + void set_size_of_parameters(int size) { _size_of_parameters = size; } + + // 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; + + const char* internal_name() const { return "{method}"; } + + // 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; } +}; + + +/// 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); +}; + +// Utility class for access exception handlers +class ExceptionTable : public StackObj { + private: + ExceptionTableElement* _table; + u2 _length; + + public: + ExceptionTable(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