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hotspot/src/share/vm/ci/ciMethod.hpp

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+/*
+ * Copyright 1999-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class ciMethodBlocks;
+class MethodLiveness;
+class BitMap;
+class Arena;
+class BCEscapeAnalyzer;
+
+
+// ciMethod
+//
+// This class represents a methodOop in the HotSpot virtual
+// machine.
+class ciMethod : public ciObject {
+  friend class CompileBroker;
+  CI_PACKAGE_ACCESS
+  friend class ciEnv;
+  friend class ciExceptionHandlerStream;
+
+ private:
+  // General method information.
+  ciFlags          _flags;
+  ciSymbol*        _name;
+  ciInstanceKlass* _holder;
+  ciSignature*     _signature;
+  ciMethodData*    _method_data;
+  BCEscapeAnalyzer* _bcea;
+  ciMethodBlocks*   _method_blocks;
+
+  // Code attributes.
+  int _code_size;
+  int _max_stack;
+  int _max_locals;
+  vmIntrinsics::ID _intrinsic_id;
+  int _handler_count;
+  int _interpreter_invocation_count;
+  int _interpreter_throwout_count;
+
+  bool _uses_monitors;
+  bool _balanced_monitors;
+  bool _is_compilable;
+  bool _can_be_statically_bound;
+
+  // Lazy fields, filled in on demand
+  address              _code;
+  ciExceptionHandler** _exception_handlers;
+
+  // Optional liveness analyzer.
+  MethodLiveness* _liveness;
+#ifdef COMPILER2
+  ciTypeFlow*     _flow;
+#endif
+
+  ciMethod(methodHandle h_m);
+  ciMethod(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature);
+
+  methodOop get_methodOop() const {
+    methodOop m = (methodOop)get_oop();
+    assert(m != NULL, "illegal use of unloaded method");
+    return m;
+  }
+
+  oop loader() const                             { return _holder->loader(); }
+
+  const char* type_string()                      { return "ciMethod"; }
+
+  void print_impl(outputStream* st);
+
+  void load_code();
+
+  void check_is_loaded() const                   { assert(is_loaded(), "not loaded"); }
+
+  void build_method_data(methodHandle h_m);
+
+  void code_at_put(int bci, Bytecodes::Code code) {
+    Bytecodes::check(code);
+    assert(0 <= bci && bci < code_size(), "valid bci");
+    address bcp = _code + bci;
+    *bcp = code;
+  }
+
+ public:
+  // Basic method information.
+  ciFlags flags() const                          { check_is_loaded(); return _flags; }
+  ciSymbol* name() const                         { return _name; }
+  ciInstanceKlass* holder() const                { return _holder; }
+  ciMethodData* method_data();
+
+  // Signature information.
+  ciSignature* signature() const                 { return _signature; }
+  ciType*      return_type() const               { return _signature->return_type(); }
+  int          arg_size_no_receiver() const      { return _signature->size(); }
+  int          arg_size() const                  { return _signature->size() + (_flags.is_static() ? 0 : 1); }
+
+  // Method code and related information.
+  address code()                                 { if (_code == NULL) load_code(); return _code; }
+  int code_size() const                          { check_is_loaded(); return _code_size; }
+  int max_stack() const                          { check_is_loaded(); return _max_stack; }
+  int max_locals() const                         { check_is_loaded(); return _max_locals; }
+  vmIntrinsics::ID intrinsic_id() const          { check_is_loaded(); return _intrinsic_id; }
+  bool has_exception_handlers() const            { check_is_loaded(); return _handler_count > 0; }
+  int exception_table_length() const             { check_is_loaded(); return _handler_count; }
+  int interpreter_invocation_count() const       { check_is_loaded(); return _interpreter_invocation_count; }
+  int interpreter_throwout_count() const         { check_is_loaded(); return _interpreter_throwout_count; }
+
+  Bytecodes::Code java_code_at_bci(int bci) {
+    address bcp = code() + bci;
+    return Bytecodes::java_code_at(bcp);
+  }
+  BCEscapeAnalyzer  *get_bcea();
+  ciMethodBlocks    *get_method_blocks();
+
+  bool    has_linenumber_table() const;          // length unknown until decompression
+  u_char* compressed_linenumber_table() const;   // not preserved by gc
+
+  int line_number_from_bci(int bci) const;
+
+  // Runtime information.
+  int           vtable_index();
+  address       native_entry();
+  address       interpreter_entry();
+
+  // Analysis and profiling.
+  //
+  // Usage note: liveness_at_bci and init_vars should be wrapped in ResourceMarks.
+  bool          uses_monitors() const            { return _uses_monitors; } // this one should go away, it has a misleading name
+  bool          has_monitor_bytecodes() const    { return _uses_monitors; }
+  bool          has_balanced_monitors();
+
+  MethodLivenessResult liveness_at_bci(int bci);
+
+  // Get the interpreters viewpoint on oop liveness.  MethodLiveness is
+  // conservative in the sense that it may consider locals to be live which
+  // cannot be live, like in the case where a local could contain an oop or
+  // a primitive along different paths.  In that case the local must be
+  // dead when those paths merge. Since the interpreter's viewpoint is
+  // used when gc'ing an interpreter frame we need to use its viewpoint
+  // during OSR when loading the locals.
+
+  BitMap  live_local_oops_at_bci(int bci);
+
+#ifdef COMPILER1
+  const BitMap  bci_block_start();
+#endif
+
+  ciTypeFlow*   get_flow_analysis();
+  ciTypeFlow*   get_osr_flow_analysis(int osr_bci);  // alternate entry point
+  ciCallProfile call_profile_at_bci(int bci);
+  int           interpreter_call_site_count(int bci);
+
+  // Given a certain calling environment, find the monomorphic target
+  // for the call.  Return NULL if the call is not monomorphic in
+  // its calling environment.
+  ciMethod* find_monomorphic_target(ciInstanceKlass* caller,
+                                    ciInstanceKlass* callee_holder,
+                                    ciInstanceKlass* actual_receiver);
+
+  // Given a known receiver klass, find the target for the call.
+  // Return NULL if the call has no target or is abstract.
+  ciMethod* resolve_invoke(ciKlass* caller, ciKlass* exact_receiver);
+
+  // Find the proper vtable index to invoke this method.
+  int resolve_vtable_index(ciKlass* caller, ciKlass* receiver);
+
+  // Compilation directives
+  bool will_link(ciKlass* accessing_klass,
+                 ciKlass* declared_method_holder,
+                 Bytecodes::Code bc);
+  bool should_exclude();
+  bool should_inline();
+  bool should_not_inline();
+  bool should_print_assembly();
+  bool break_at_execute();
+  bool has_option(const char *option);
+  bool can_be_compiled();
+  bool can_be_osr_compiled(int entry_bci);
+  void set_not_compilable();
+  bool has_compiled_code();
+  int  instructions_size();
+  void log_nmethod_identity(xmlStream* log);
+  bool is_not_reached(int bci);
+  bool was_executed_more_than(int times);
+  bool has_unloaded_classes_in_signature();
+  bool is_klass_loaded(int refinfo_index, bool must_be_resolved) const;
+  bool check_call(int refinfo_index, bool is_static) const;
+  void build_method_data();  // make sure it exists in the VM also
+  int scale_count(int count, float prof_factor = 1.);  // make MDO count commensurate with IIC
+
+  // What kind of ciObject is this?
+  bool is_method()                               { return true; }
+
+  // Java access flags
+  bool is_public      () const                   { return flags().is_public(); }
+  bool is_private     () const                   { return flags().is_private(); }
+  bool is_protected   () const                   { return flags().is_protected(); }
+  bool is_static      () const                   { return flags().is_static(); }
+  bool is_final       () const                   { return flags().is_final(); }
+  bool is_synchronized() const                   { return flags().is_synchronized(); }
+  bool is_native      () const                   { return flags().is_native(); }
+  bool is_interface   () const                   { return flags().is_interface(); }
+  bool is_abstract    () const                   { return flags().is_abstract(); }
+  bool is_strict      () const                   { return flags().is_strict(); }
+
+  // Other flags
+  bool is_empty_method() const;
+  bool is_vanilla_constructor() const;
+  bool is_final_method() const                   { return is_final() || holder()->is_final(); }
+  bool has_loops      () const;
+  bool has_jsrs       () const;
+  bool is_accessor    () const;
+  bool is_initializer () const;
+  bool can_be_statically_bound() const           { return _can_be_statically_bound; }
+
+  // Print the bytecodes of this method.
+  void print_codes_on(outputStream* st);
+  void print_codes() {
+    print_codes_on(tty);
+  }
+  void print_codes_on(int from, int to, outputStream* st);
+
+  // Print the name of this method in various incarnations.
+  void print_name(outputStream* st = tty);
+  void print_short_name(outputStream* st = tty);
+};