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#ifndef SHARE_INTERPRETER_LINKRESOLVER_HPP
#define SHARE_INTERPRETER_LINKRESOLVER_HPP
#include "interpreter/bootstrapInfo.hpp"
#include "oops/method.hpp"
// All the necessary definitions for run-time link resolution.
// 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 CallInfo : public StackObj {
public:
// 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:
Klass* _resolved_klass; // static receiver klass, resolved from a symbolic reference
Klass* _selected_klass; // dynamic receiver class (same as static, or subklass)
methodHandle _resolved_method; // static target method
methodHandle _selected_method; // dynamic (actual) target 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_name; // Object holding the ResolvedMethodName
void set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS);
void set_interface(Klass* resolved_klass, Klass* selected_klass,
const methodHandle& resolved_method,
const methodHandle& selected_method,
int itable_index, TRAPS);
void set_virtual(Klass* resolved_klass, Klass* selected_klass,
const methodHandle& resolved_method,
const methodHandle& selected_method,
int vtable_index, TRAPS);
void set_handle(const methodHandle& resolved_method,
Handle resolved_appendix, TRAPS);
void set_handle(Klass* resolved_klass,
const methodHandle& resolved_method,
Handle resolved_appendix, TRAPS);
void set_common(Klass* resolved_klass, Klass* selected_klass,
const methodHandle& resolved_method,
const methodHandle& selected_method,
CallKind kind,
int index, TRAPS);
friend class BootstrapInfo;
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. This also creates a ResolvedMethodName
// object for the resolved_method.
CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS);
Klass* resolved_klass() const { return _resolved_klass; }
Klass* selected_klass() const { return _selected_klass; }
Method* resolved_method() const { return _resolved_method(); }
Method* selected_method() const { return _selected_method(); }
Handle resolved_appendix() const { return _resolved_appendix; }
Handle resolved_method_name() const { return _resolved_method_name; }
// Materialize a java.lang.invoke.ResolvedMethodName for this resolved_method
void set_resolved_method_name(TRAPS);
BasicType result_type() const { return selected_method()->result_type(); }
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(), "");
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;
};
// Condensed information from constant pool to use to resolve the method or field.
// resolved_klass = specified class (i.e., static receiver class)
// current_klass = sending method holder (i.e., class containing the method
// containing the call being resolved)
// current_method = sending method (relevant for field resolution)
class LinkInfo : public StackObj {
Symbol* _name; // extracted from JVM_CONSTANT_NameAndType
Symbol* _signature;
Klass* _resolved_klass; // class that the constant pool entry points to
Klass* _current_klass; // class that owns the constant pool
methodHandle _current_method; // sending method
bool _check_access;
constantTag _tag;
public:
enum AccessCheck {
needs_access_check,
skip_access_check
};
LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS);
LinkInfo(const constantPoolHandle& pool, int index, TRAPS);
// Condensed information from other call sites within the vm.
LinkInfo(Klass* resolved_klass, Symbol* name, Symbol* signature, Klass* current_klass,
AccessCheck check_access = needs_access_check,
constantTag tag = JVM_CONSTANT_Invalid) :
_name(name),
_signature(signature), _resolved_klass(resolved_klass), _current_klass(current_klass), _current_method(methodHandle()),
_check_access(check_access == needs_access_check), _tag(tag) {}
LinkInfo(Klass* resolved_klass, Symbol* name, Symbol* signature, const methodHandle& current_method,
AccessCheck check_access = needs_access_check,
constantTag tag = JVM_CONSTANT_Invalid) :
_name(name),
_signature(signature), _resolved_klass(resolved_klass), _current_klass(current_method->method_holder()), _current_method(current_method),
_check_access(check_access == needs_access_check), _tag(tag) {}
// Case where we just find the method and don't check access against the current class
LinkInfo(Klass* resolved_klass, Symbol*name, Symbol* signature) :
_name(name),
_signature(signature), _resolved_klass(resolved_klass), _current_klass(NULL), _current_method(methodHandle()),
_check_access(false), _tag(JVM_CONSTANT_Invalid) {}
// accessors
Symbol* name() const { return _name; }
Symbol* signature() const { return _signature; }
Klass* resolved_klass() const { return _resolved_klass; }
Klass* current_klass() const { return _current_klass; }
Method* current_method() const { return _current_method(); }
constantTag tag() const { return _tag; }
bool check_access() const { return _check_access; }
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 Method* lookup_method_in_klasses(const LinkInfo& link_info,
bool checkpolymorphism,
bool in_imethod_resolve);
static Method* lookup_method_in_interfaces(const LinkInfo& link_info);
static Method* lookup_polymorphic_method(const LinkInfo& link_info,
Handle *appendix_result_or_null, TRAPS);
JVMCI_ONLY(public:) // Needed for CompilerToVM.resolveMethod()
// Not Linktime so doesn't take LinkInfo
static Method* lookup_instance_method_in_klasses (Klass* klass, Symbol* name, Symbol* signature,
Klass::PrivateLookupMode private_mode, TRAPS);
JVMCI_ONLY(private:)
// Similar loader constraint checking functions that throw
// LinkageError with descriptive message.
static void check_method_loader_constraints(const LinkInfo& link_info,
const methodHandle& resolved_method,
const char* method_type, TRAPS);
static void check_field_loader_constraints(Symbol* field, Symbol* sig,
Klass* current_klass,
Klass* sel_klass, TRAPS);
static Method* resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS);
static Method* resolve_method (const LinkInfo& link_info, Bytecodes::Code code, TRAPS);
static Method* linktime_resolve_static_method (const LinkInfo& link_info, TRAPS);
static Method* linktime_resolve_special_method (const LinkInfo& link_info, TRAPS);
static Method* linktime_resolve_virtual_method (const LinkInfo& link_info, TRAPS);
static Method* linktime_resolve_interface_method (const LinkInfo& link_info, TRAPS);
static void runtime_resolve_special_method (CallInfo& result,
const LinkInfo& link_info,
const methodHandle& resolved_method,
Handle recv, TRAPS);
static void runtime_resolve_virtual_method (CallInfo& result,
const methodHandle& resolved_method,
Klass* resolved_klass,
Handle recv,
Klass* recv_klass,
bool check_null_and_abstract, TRAPS);
static void runtime_resolve_interface_method (CallInfo& result,
const methodHandle& resolved_method,
Klass* resolved_klass,
Handle recv,
Klass* recv_klass,
bool check_null_and_abstract, TRAPS);
static void check_field_accessability(Klass* ref_klass,
Klass* resolved_klass,
Klass* sel_klass,
const fieldDescriptor& fd, TRAPS);
static void check_method_accessability(Klass* ref_klass,
Klass* resolved_klass,
Klass* sel_klass,
const methodHandle& sel_method, TRAPS);
// runtime resolving from constant pool
static void resolve_invokestatic (CallInfo& result,
const constantPoolHandle& pool, int index, TRAPS);
static void resolve_invokespecial (CallInfo& result, Handle recv,
const constantPoolHandle& pool, int index, TRAPS);
static void resolve_invokevirtual (CallInfo& result, Handle recv,
const constantPoolHandle& pool, int index, TRAPS);
static void resolve_invokeinterface(CallInfo& result, Handle recv,
const constantPoolHandle& pool, int index, TRAPS);
static void resolve_invokedynamic (CallInfo& result,
const constantPoolHandle& pool, int index, TRAPS);
static void resolve_invokehandle (CallInfo& result,
const constantPoolHandle& pool, int index, TRAPS);
public:
// constant pool resolving
static void check_klass_accessability(Klass* ref_klass, Klass* sel_klass,
bool fold_type_to_class, TRAPS);
// The optional 'fold_type_to_class' means that a derived type (array)
// is first converted to the class it is derived from (element type).
// If this element type is not a class, then the check passes quietly.
// This is usually what is needed, but a few existing uses might break
// if this flag were always turned on. FIXME: See if it can be, always.
static void check_klass_accessability(Klass* ref_klass, Klass* sel_klass, TRAPS) {
return check_klass_accessability(ref_klass, sel_klass, false, THREAD);
}
// static resolving calls (will not run any Java code);
// used only from Bytecode_invoke::static_target
static Method* resolve_method_statically(Bytecodes::Code code,
const constantPoolHandle& pool,
int index, TRAPS);
static void resolve_field_access(fieldDescriptor& result,
const constantPoolHandle& pool,
int index,
const methodHandle& method,
Bytecodes::Code byte, TRAPS);
static void resolve_field(fieldDescriptor& result, const LinkInfo& link_info,
Bytecodes::Code access_kind,
bool initialize_class, TRAPS);
static void resolve_static_call (CallInfo& result,
const LinkInfo& link_info,
bool initialize_klass, TRAPS);
static void resolve_special_call (CallInfo& result,
Handle recv,
const LinkInfo& link_info,
TRAPS);
static void resolve_virtual_call (CallInfo& result, Handle recv, Klass* recv_klass,
const LinkInfo& link_info,
bool check_null_and_abstract, TRAPS);
static void resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass,
const LinkInfo& link_info,
bool check_null_and_abstract, TRAPS);
static void resolve_handle_call (CallInfo& result,
const LinkInfo& link_info, TRAPS);
static void resolve_dynamic_call (CallInfo& result,
BootstrapInfo& bootstrap_specifier, TRAPS);
// same as above for compile-time resolution; but returns null handle instead of throwing
// an exception on error also, does not initialize klass (i.e., no side effects)
static Method* resolve_virtual_call_or_null(Klass* receiver_klass,
const LinkInfo& link_info);
static Method* resolve_interface_call_or_null(Klass* receiver_klass,
const LinkInfo& link_info);
static Method* resolve_static_call_or_null(const LinkInfo& link_info);
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