--- /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<u1>* stackmap_data() const {
+ return constMethod()->stackmap_data();
+ }
+
+ void set_stackmap_data(Array<u1>* 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 (<init> or <clinit>).
+ 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 <clinit> and the method has
+ // valid static initializer flags.
+ bool is_static_initializer() const;
+
+ // returns true if the method name is <init>
+ 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<Method*>* 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<mtClass> {
+ 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