// defineclass.cc - defining a class from .class format.
-/* Copyright (C) 1999, 2000, 2001 Free Software Foundation
+/* Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation
This file is part of libgcj.
#include <java/lang/ClassFormatError.h>
#include <java/lang/NoClassDefFoundError.h>
#include <java/lang/ClassCircularityError.h>
-#include <java/lang/ClassNotFoundException.h>
#include <java/lang/IncompatibleClassChangeError.h>
#include <java/lang/reflect/Modifier.h>
// allways on. You always want this as far as I can see, but it also
// controls weither identifiers and type descriptors/signatures are
// verified as legal. This could be somewhat more expensive since it
- // will call Characher.isJavaIdentifier{Start,Part} for each character
+ // will call Character.isJavaIdentifier{Start,Part} for each character
// in any identifier (field name or method name) it comes by. Thus,
// it might be useful to turn off this verification for classes that
// come from a trusted source. However, for GCJ, trusted classes are
unsigned int *offsets;
// the class to define (see java-interp.h)
- _Jv_InterpClass *def;
+ jclass def;
+
+ // the classes associated interpreter data.
+ _Jv_InterpClass *def_interp;
/* check that the given number of input bytes are available */
inline void check (int num)
bytes = (unsigned char*) (elements (data)+offset);
len = length;
pos = 0;
- def = (_Jv_InterpClass*) klass;
+ def = klass;
+ def_interp = (_Jv_InterpClass *) def->aux_info;
}
/** and here goes the parser members defined out-of-line */
int name_index = read2u ();
int descriptor_index = read2u ();
int attributes_count = read2u ();
-
+
check_tag (name_index, JV_CONSTANT_Utf8);
prepare_pool_entry (name_index, JV_CONSTANT_Utf8);
check_tag (descriptor_index, JV_CONSTANT_Utf8);
prepare_pool_entry (descriptor_index, JV_CONSTANT_Utf8);
-
+
handleField (i, access_flags, name_index, descriptor_index);
-
+
for (int j = 0; j < attributes_count; j++)
{
read_one_field_attribute (i);
name_index, type_index);
if (this_tag == JV_CONSTANT_Fieldref)
- _Jv_VerifyFieldSignature (pool_data[type_index].utf8);
+ verify_field_signature (pool_data[type_index].utf8);
else
- _Jv_VerifyMethodSignature (pool_data[type_index].utf8);
+ verify_method_signature (pool_data[type_index].utf8);
_Jv_Utf8Const* name = pool_data[name_index].utf8;
throw_no_class_def_found_error (msg);
}
- def->accflags = access_flags;
+ def->accflags = access_flags | java::lang::reflect::Modifier::INTERPRETED;
pool_data[this_class].clazz = def;
pool_tags[this_class] = JV_CONSTANT_ResolvedClass;
- if (super_class == 0)
+ if (super_class == 0 && ! (access_flags & Modifier::INTERFACE))
{
- // interfaces have java.lang.Object as super.
- if (access_flags & Modifier::INTERFACE)
- {
- def->superclass = (jclass)&java::lang::Object::class$;
- }
-
// FIXME: Consider this carefully!
- else if (!_Jv_equalUtf8Consts (def->name,
- java::lang::Object::class$.name))
- {
- throw_no_class_def_found_error ("loading java.lang.Object");
- }
+ if (! _Jv_equalUtf8Consts (def->name, java::lang::Object::class$.name))
+ throw_no_class_def_found_error ("loading java.lang.Object");
}
// In the pre-loading state, it can be looked up in the
if (super_class != 0)
{
- // load the super class
+ // Load the superclass.
check_tag (super_class, JV_CONSTANT_Class);
_Jv_Utf8Const* super_name = pool_data[super_class].utf8;
- // load the super class using our defining loader
+ // Load the superclass using our defining loader.
jclass the_super = _Jv_FindClass (super_name,
def->loader);
// This will establish that we are allowed to be a subclass,
- // and check for class circularity error
+ // and check for class circularity error.
checkExtends (def, the_super);
- def->superclass = the_super;
+ // Note: for an interface we will find Object as the
+ // superclass. We still check it above to ensure class file
+ // validity, but we simply assign `null' to the actual field in
+ // this case.
+ def->superclass = (((access_flags & Modifier::INTERFACE))
+ ? NULL : the_super);
pool_data[super_class].clazz = the_super;
pool_tags[super_class] = JV_CONSTANT_ResolvedClass;
}
- // now we've come past the circularity problem, we can
- // now say that we're loading...
+ // Now we've come past the circularity problem, we can
+ // now say that we're loading.
def->state = JV_STATE_LOADING;
def->notifyAll ();
def->fields = (_Jv_Field*)
_Jv_AllocBytes (count * sizeof (_Jv_Field));
def->field_count = count;
- def->field_initializers = (_Jv_ushort*)
+ def_interp->field_initializers = (_Jv_ushort*)
_Jv_AllocBytes (count * sizeof (_Jv_ushort));
for (int i = 0; i < count; i++)
- def->field_initializers[i] = (_Jv_ushort) 0;
+ def_interp->field_initializers[i] = (_Jv_ushort) 0;
}
void _Jv_ClassReader::handleField (int field_no,
field->nameIndex = name;
#endif
- if (verify)
- verify_identifier (field_name);
-
- // ignore flags we don't know about.
+ // Ignore flags we don't know about.
field->flags = flags & Modifier::ALL_FLAGS;
+ _Jv_Utf8Const* sig = pool_data[desc].utf8;
+
if (verify)
{
+ verify_identifier (field_name);
+
+ for (int i = 0; i < field_no; ++i)
+ {
+ if (_Jv_equalUtf8Consts (field_name, def->fields[i].name)
+ && _Jv_equalUtf8Consts (sig,
+ // We know the other fields are
+ // unresolved.
+ (_Jv_Utf8Const *) def->fields[i].type))
+ throw_class_format_error ("duplicate field name");
+ }
+
if (field->flags & (Modifier::SYNCHRONIZED
| Modifier::NATIVE
| Modifier::INTERFACE
throw_class_format_error ("erroneous field access flags");
}
- _Jv_Utf8Const* sig = pool_data[desc].utf8;
-
if (verify)
- _Jv_VerifyFieldSignature (sig);
+ verify_field_signature (sig);
// field->type is really a jclass, but while it is still
// unresolved we keep an _Jv_Utf8Const* instead.
throw_class_format_error ("field has multiple ConstantValue attributes");
field->flags |= _Jv_FIELD_CONSTANT_VALUE;
- def->field_initializers[field_index] = value;
+ def_interp->field_initializers[field_index] = value;
/* type check the initializer */
int low = 0;
int high = def->field_count-1;
_Jv_Field *fields = def->fields;
- _Jv_ushort *inits = def->field_initializers;
+ _Jv_ushort *inits = def_interp->field_initializers;
// this is kind of a raw version of quicksort.
while (low < high)
void
_Jv_ClassReader::handleMethodsBegin (int count)
{
- def->methods = (_Jv_Method*)
- _Jv_AllocBytes (sizeof (_Jv_Method)*count);
+ def->methods = (_Jv_Method *) _Jv_AllocBytes (sizeof (_Jv_Method) * count);
- def->interpreted_methods
+ def_interp->interpreted_methods
= (_Jv_MethodBase **) _Jv_AllocBytes (sizeof (_Jv_MethodBase *)
* count);
for (int i = 0; i < count; i++)
- def->interpreted_methods[i] = 0;
+ {
+ def_interp->interpreted_methods[i] = 0;
+ def->methods[i].index = (_Jv_ushort) -1;
+ }
def->method_count = count;
}
else
verify_identifier (method->name);
- _Jv_VerifyMethodSignature (method->signature);
+ verify_method_signature (method->signature);
+
+ for (int i = 0; i < mth_index; ++i)
+ {
+ if (_Jv_equalUtf8Consts (method->name, def->methods[i].name)
+ && _Jv_equalUtf8Consts (method->signature,
+ def->methods[i].signature))
+ throw_class_format_error ("duplicate method");
+ }
if (method->accflags & (Modifier::VOLATILE
| Modifier::TRANSIENT
_Jv_InterpMethod *method =
(_Jv_InterpMethod*) (_Jv_AllocBytes (size));
+ method->deferred = NULL;
method->max_stack = max_stack;
method->max_locals = max_locals;
method->code_length = code_length;
method->exc_count = exc_table_length;
method->defining_class = def;
method->self = &def->methods[method_index];
+ method->prepared = NULL;
// grab the byte code!
memcpy ((void*) method->bytecode (),
(void*) (bytes+code_start),
code_length);
- def->interpreted_methods[method_index] = method;
+ def_interp->interpreted_methods[method_index] = method;
+
+ if ((method->self->accflags & java::lang::reflect::Modifier::STATIC))
+ {
+ // Precompute the ncode field for a static method. This lets us
+ // call a static method of an interpreted class from precompiled
+ // code without first resolving the class (that will happen
+ // during class initialization instead).
+ method->self->ncode = method->ncode ();
+ }
}
-void _Jv_ClassReader::handleExceptionTableEntry
+void _Jv_ClassReader::handleExceptionTableEntry
(int method_index, int exc_index,
int start_pc, int end_pc, int handler_pc, int catch_type)
{
_Jv_InterpMethod *method = reinterpret_cast<_Jv_InterpMethod *>
- (def->interpreted_methods[method_index]);
+ (def_interp->interpreted_methods[method_index]);
_Jv_InterpException *exc = method->exceptions ();
- exc[exc_index].start_pc = start_pc;
- exc[exc_index].end_pc = end_pc;
- exc[exc_index].handler_pc = handler_pc;
- exc[exc_index].handler_type = catch_type;
+ exc[exc_index].start_pc.i = start_pc;
+ exc[exc_index].end_pc.i = end_pc;
+ exc[exc_index].handler_pc.i = handler_pc;
+ exc[exc_index].handler_type.i = catch_type;
}
void _Jv_ClassReader::handleMethodsEnd ()
_Jv_Method *method = &def->methods[i];
if ((method->accflags & Modifier::NATIVE) != 0)
{
- if (def->interpreted_methods[i] != 0)
+ if (def_interp->interpreted_methods[i] != 0)
throw_class_format_error ("code provided for native method");
else
{
m->defining_class = def;
m->self = method;
m->function = NULL;
- def->interpreted_methods[i] = m;
+ def_interp->interpreted_methods[i] = m;
+ m->deferred = NULL;
+
+ if ((method->accflags & Modifier::STATIC))
+ {
+ // Precompute the ncode field for a static method.
+ // This lets us call a static method of an
+ // interpreted class from precompiled code without
+ // first resolving the class (that will happen
+ // during class initialization instead).
+ method->ncode = m->ncode ();
+ }
}
}
else if ((method->accflags & Modifier::ABSTRACT) != 0)
{
- if (def->interpreted_methods[i] != 0)
+ if (def_interp->interpreted_methods[i] != 0)
throw_class_format_error ("code provided for abstract method");
}
else
{
- if (def->interpreted_methods[i] == 0)
+ if (def_interp->interpreted_methods[i] == 0)
throw_class_format_error ("method with no code");
}
}
throw new java::lang::InternalError (JvNewStringLatin1 (msg));
}
-static void throw_incompatible_class_change_error (jstring msg)
+static void
+throw_incompatible_class_change_error (jstring msg)
{
throw new java::lang::IncompatibleClassChangeError (msg);
}
-static void throw_class_circularity_error (jstring msg)
+static void
+throw_class_circularity_error (jstring msg)
{
throw new java::lang::ClassCircularityError (msg);
}
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