--- a/hotspot/src/share/vm/interpreter/linkResolver.hpp Tue Sep 17 23:12:27 2013 +0200
+++ b/hotspot/src/share/vm/interpreter/linkResolver.hpp Fri Sep 13 22:38:02 2013 -0400
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2013, 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
@@ -30,63 +30,54 @@
// All the necessary definitions for run-time link resolution.
-// LinkInfo & its subclasses provide all the information gathered
-// for a particular link after resolving it. A link is any reference
+// CallInfo provides all the information gathered for a particular
+// linked call site after resolving it. A link is any reference
// made from within the bytecodes of a method to an object outside of
// that method. If the info is invalid, the link has not been resolved
// successfully.
-class LinkInfo VALUE_OBJ_CLASS_SPEC {
-};
-
-
-// Link information for getfield/putfield & getstatic/putstatic bytecodes.
-
-class FieldAccessInfo: public LinkInfo {
- protected:
- KlassHandle _klass;
- Symbol* _name;
- AccessFlags _access_flags;
- int _field_index; // original index in the klass
- int _field_offset;
- BasicType _field_type;
-
+class CallInfo VALUE_OBJ_CLASS_SPEC {
public:
- void set(KlassHandle klass, Symbol* name, int field_index, int field_offset,
- BasicType field_type, AccessFlags access_flags);
- KlassHandle klass() const { return _klass; }
- Symbol* name() const { return _name; }
- int field_index() const { return _field_index; }
- int field_offset() const { return _field_offset; }
- BasicType field_type() const { return _field_type; }
- AccessFlags access_flags() const { return _access_flags; }
-
- // debugging
- void print() PRODUCT_RETURN;
-};
-
-
-// Link information for all calls.
-
-class CallInfo: public LinkInfo {
+ // Ways that a method call might be selected (or not) based on receiver type.
+ // Note that an invokevirtual instruction might be linked with no_dispatch,
+ // and an invokeinterface instruction might be linked with any of the three options
+ enum CallKind {
+ direct_call, // jump into resolved_method (must be concrete)
+ vtable_call, // select recv.klass.method_at_vtable(index)
+ itable_call, // select recv.klass.method_at_itable(resolved_method.holder, index)
+ unknown_kind = -1
+ };
private:
- KlassHandle _resolved_klass; // static receiver klass
+ KlassHandle _resolved_klass; // static receiver klass, resolved from a symbolic reference
KlassHandle _selected_klass; // dynamic receiver class (same as static, or subklass)
methodHandle _resolved_method; // static target method
methodHandle _selected_method; // dynamic (actual) target method
- int _vtable_index; // vtable index of selected method
+ CallKind _call_kind; // kind of call (static(=bytecode static/special +
+ // others inferred), vtable, itable)
+ int _call_index; // vtable or itable index of selected class method (if any)
Handle _resolved_appendix; // extra argument in constant pool (if CPCE::has_appendix)
Handle _resolved_method_type; // MethodType (for invokedynamic and invokehandle call sites)
void set_static( KlassHandle resolved_klass, methodHandle resolved_method , TRAPS);
- void set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method , TRAPS);
+ void set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int itable_index , TRAPS);
void set_virtual( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index , TRAPS);
void set_handle( methodHandle resolved_method, Handle resolved_appendix, Handle resolved_method_type, TRAPS);
- void set_common( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index , TRAPS);
+ void set_common( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, CallKind kind, int index, TRAPS);
friend class LinkResolver;
public:
+ CallInfo() {
+#ifndef PRODUCT
+ _call_kind = CallInfo::unknown_kind;
+ _call_index = Method::garbage_vtable_index;
+#endif //PRODUCT
+ }
+
+ // utility to extract an effective CallInfo from a method and an optional receiver limit
+ // does not queue the method for compilation
+ CallInfo(Method* resolved_method, Klass* resolved_klass = NULL);
+
KlassHandle resolved_klass() const { return _resolved_klass; }
KlassHandle selected_klass() const { return _selected_klass; }
methodHandle resolved_method() const { return _resolved_method; }
@@ -95,21 +86,43 @@
Handle resolved_method_type() const { return _resolved_method_type; }
BasicType result_type() const { return selected_method()->result_type(); }
- bool has_vtable_index() const { return _vtable_index >= 0; }
- bool is_statically_bound() const { return _vtable_index == Method::nonvirtual_vtable_index; }
+ CallKind call_kind() const { return _call_kind; }
+ int call_index() const { return _call_index; }
int vtable_index() const {
// Even for interface calls the vtable index could be non-negative.
// See CallInfo::set_interface.
assert(has_vtable_index() || is_statically_bound(), "");
- return _vtable_index;
+ assert(call_kind() == vtable_call || call_kind() == direct_call, "");
+ // The returned value is < 0 if the call is statically bound.
+ // But, the returned value may be >= 0 even if the kind is direct_call.
+ // It is up to the caller to decide which way to go.
+ return _call_index;
}
+ int itable_index() const {
+ assert(call_kind() == itable_call, "");
+ // The returned value is always >= 0, a valid itable index.
+ return _call_index;
+ }
+
+ // debugging
+#ifdef ASSERT
+ bool has_vtable_index() const { return _call_index >= 0 && _call_kind != CallInfo::itable_call; }
+ bool is_statically_bound() const { return _call_index == Method::nonvirtual_vtable_index; }
+#endif //ASSERT
+ void verify() PRODUCT_RETURN;
+ void print() PRODUCT_RETURN;
};
+// Link information for getfield/putfield & getstatic/putstatic bytecodes
+// is represented using a fieldDescriptor.
// The LinkResolver is used to resolve constant-pool references at run-time.
// It does all necessary link-time checks & throws exceptions if necessary.
class LinkResolver: AllStatic {
+ friend class klassVtable;
+ friend class klassItable;
+
private:
static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
@@ -120,7 +133,6 @@
static int vtable_index_of_miranda_method(KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
static void resolve_klass (KlassHandle& result, constantPoolHandle pool, int index, TRAPS);
- static void resolve_klass_no_update (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); // no update of constantPool entry
static void resolve_pool (KlassHandle& resolved_klass, Symbol*& method_name, Symbol*& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS);
@@ -148,9 +160,16 @@
Bytecodes::Code code, constantPoolHandle pool, int index, TRAPS);
// runtime/static resolving for fields
- static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, TRAPS);
- // takes an extra bool argument "update_pool" to decide whether to update the constantPool during klass resolution.
- static void resolve_field(FieldAccessInfo& result, constantPoolHandle pool, int index, Bytecodes::Code byte, bool check_only, bool update_pool, TRAPS);
+ static void resolve_field_access(fieldDescriptor& result, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS);
+ static void resolve_field(fieldDescriptor& result, KlassHandle resolved_klass, Symbol* field_name, Symbol* field_signature,
+ KlassHandle current_klass, Bytecodes::Code access_kind, bool check_access, bool initialize_class, TRAPS);
+
+ // source of access_kind codes:
+ static Bytecodes::Code field_access_kind(bool is_static, bool is_put) {
+ return (is_static
+ ? (is_put ? Bytecodes::_putstatic : Bytecodes::_getstatic)
+ : (is_put ? Bytecodes::_putfield : Bytecodes::_getfield ));
+ }
// runtime resolving:
// resolved_klass = specified class (i.e., static receiver class)