--- /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<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.
+ 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 (<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;
+
+ // 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<Method*>* methods,
+ Array<AnnotationArray*>* methods_annotations,
+ Array<AnnotationArray*>* methods_parameter_annotations,
+ Array<AnnotationArray*>* 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<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);
+};
+
+// 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