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gcc/libjava/resolve.cc
Jesse Rosenstock 8848a766bc re PR libgcj/7709 (NullPointerException in _Jv_ResolvePoolEntry) 
2002-09-25  Jesse Rosenstock  <jmr@ugcs.caltech.edu>

	* resolve.cc (_Jv_ResolvePoolEntry) [end_of_method_search]: Check
	to see if `the_method == 0' before looking up vtable index.
	Fixes PR libgcj/7709.

From-SVN: r57517
2002-09-25 21:02:32 +00:00

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// resolve.cc - Code for linking and resolving classes and pool entries.
/* Copyright (C) 1999, 2000, 2001 , 2002 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
/* Author: Kresten Krab Thorup <krab@gnu.org> */
#include <config.h>
#include <java-interp.h>
#include <jvm.h>
#include <gcj/cni.h>
#include <string.h>
#include <java-cpool.h>
#include <java/lang/Class.h>
#include <java/lang/String.h>
#include <java/lang/StringBuffer.h>
#include <java/lang/Thread.h>
#include <java/lang/InternalError.h>
#include <java/lang/VirtualMachineError.h>
#include <java/lang/NoSuchFieldError.h>
#include <java/lang/NoSuchMethodError.h>
#include <java/lang/ClassFormatError.h>
#include <java/lang/IllegalAccessError.h>
#include <java/lang/AbstractMethodError.h>
#include <java/lang/NoClassDefFoundError.h>
#include <java/lang/IncompatibleClassChangeError.h>
#include <java/lang/reflect/Modifier.h>
using namespace gcj;
void
_Jv_ResolveField (_Jv_Field *field, java::lang::ClassLoader *loader)
{
if (! field->isResolved ())
{
_Jv_Utf8Const *sig = (_Jv_Utf8Const*)field->type;
field->type = _Jv_FindClassFromSignature (sig->data, loader);
field->flags &= ~_Jv_FIELD_UNRESOLVED_FLAG;
}
}
#ifdef INTERPRETER
static void throw_internal_error (char *msg)
__attribute__ ((__noreturn__));
static void throw_class_format_error (jstring msg)
__attribute__ ((__noreturn__));
static void throw_class_format_error (char *msg)
__attribute__ ((__noreturn__));
// Exceptional return values for _Jv_DetermineVTableIndex
#define METHOD_NOT_THERE (-2)
#define METHOD_INACCESSIBLE (-1)
static int get_alignment_from_class (jclass);
static _Jv_ResolvedMethod*
_Jv_BuildResolvedMethod (_Jv_Method*,
jclass,
jboolean,
jint);
static void throw_incompatible_class_change_error (jstring msg)
{
throw new java::lang::IncompatibleClassChangeError (msg);
}
_Jv_word
_Jv_ResolvePoolEntry (jclass klass, int index)
{
using namespace java::lang::reflect;
_Jv_Constants *pool = &klass->constants;
if ((pool->tags[index] & JV_CONSTANT_ResolvedFlag) != 0)
return pool->data[index];
switch (pool->tags[index]) {
case JV_CONSTANT_Class:
{
_Jv_Utf8Const *name = pool->data[index].utf8;
jclass found;
if (name->data[0] == '[')
found = _Jv_FindClassFromSignature (&name->data[0],
klass->loader);
else
found = _Jv_FindClass (name, klass->loader);
if (! found)
{
jstring str = _Jv_NewStringUTF (name->data);
// This exception is specified in JLS 2nd Ed, section 5.1.
throw new java::lang::NoClassDefFoundError (str);
}
if ((found->accflags & Modifier::PUBLIC) == Modifier::PUBLIC
|| (_Jv_ClassNameSamePackage (found->name,
klass->name)))
{
pool->data[index].clazz = found;
pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
}
else
{
throw new java::lang::IllegalAccessError (found->getName());
}
}
break;
case JV_CONSTANT_String:
{
jstring str;
str = _Jv_NewStringUtf8Const (pool->data[index].utf8);
pool->data[index].o = str;
pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
}
break;
case JV_CONSTANT_Fieldref:
{
_Jv_ushort class_index, name_and_type_index;
_Jv_loadIndexes (&pool->data[index],
class_index,
name_and_type_index);
jclass owner = (_Jv_ResolvePoolEntry (klass, class_index)).clazz;
if (owner != klass)
_Jv_InitClass (owner);
_Jv_ushort name_index, type_index;
_Jv_loadIndexes (&pool->data[name_and_type_index],
name_index,
type_index);
_Jv_Utf8Const *field_name = pool->data[name_index].utf8;
_Jv_Utf8Const *field_type_name = pool->data[type_index].utf8;
// FIXME: The implementation of this function
// (_Jv_FindClassFromSignature) will generate an instance of
// _Jv_Utf8Const for each call if the field type is a class name
// (Lxx.yy.Z;). This may be too expensive to do for each and
// every fieldref being resolved. For now, we fix the problem by
// only doing it when we have a loader different from the class
// declaring the field.
jclass field_type = 0;
if (owner->loader != klass->loader)
field_type = _Jv_FindClassFromSignature (field_type_name->data,
klass->loader);
_Jv_Field* the_field = 0;
for (jclass cls = owner; cls != 0; cls = cls->getSuperclass ())
{
for (int i = 0; i < cls->field_count; i++)
{
_Jv_Field *field = &cls->fields[i];
if (! _Jv_equalUtf8Consts (field->name, field_name))
continue;
// now, check field access.
if ( (cls == klass)
|| ((field->flags & Modifier::PUBLIC) != 0)
|| (((field->flags & Modifier::PROTECTED) != 0)
&& cls->isAssignableFrom (klass))
|| (((field->flags & Modifier::PRIVATE) == 0)
&& _Jv_ClassNameSamePackage (cls->name,
klass->name)))
{
/* resove the field using the class' own loader
if necessary */
if (!field->isResolved ())
_Jv_ResolveField (field, cls->loader);
if (field_type != 0 && field->type != field_type)
throw new java::lang::LinkageError
(JvNewStringLatin1
("field type mismatch with different loaders"));
the_field = field;
goto end_of_field_search;
}
else
{
throw new java::lang::IllegalAccessError;
}
}
}
end_of_field_search:
if (the_field == 0)
{
java::lang::StringBuffer *sb = new java::lang::StringBuffer();
sb->append(JvNewStringLatin1("field "));
sb->append(owner->getName());
sb->append(JvNewStringLatin1("."));
sb->append(_Jv_NewStringUTF(field_name->data));
sb->append(JvNewStringLatin1(" was not found."));
throw_incompatible_class_change_error(sb->toString());
}
pool->data[index].field = the_field;
pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
}
break;
case JV_CONSTANT_Methodref:
case JV_CONSTANT_InterfaceMethodref:
{
_Jv_ushort class_index, name_and_type_index;
_Jv_loadIndexes (&pool->data[index],
class_index,
name_and_type_index);
jclass owner = (_Jv_ResolvePoolEntry (klass, class_index)).clazz;
if (owner != klass)
_Jv_InitClass (owner);
_Jv_ushort name_index, type_index;
_Jv_loadIndexes (&pool->data[name_and_type_index],
name_index,
type_index);
_Jv_Utf8Const *method_name = pool->data[name_index].utf8;
_Jv_Utf8Const *method_signature = pool->data[type_index].utf8;
int vtable_index = -1;
_Jv_Method *the_method = 0;
jclass found_class = 0;
// First search the class itself.
the_method = _Jv_SearchMethodInClass (owner, klass,
method_name, method_signature);
if (the_method != 0)
{
found_class = owner;
goto end_of_method_search;
}
// If we are resolving an interface method, search the interface's
// superinterfaces (A superinterface is not an interface's superclass -
// a superinterface is implemented by the interface).
if (pool->tags[index] == JV_CONSTANT_InterfaceMethodref)
{
_Jv_ifaces ifaces;
ifaces.count = 0;
ifaces.len = 4;
ifaces.list = (jclass *) _Jv_Malloc (ifaces.len * sizeof (jclass *));
_Jv_GetInterfaces (owner, &ifaces);
for (int i=0; i < ifaces.count; i++)
{
jclass cls = ifaces.list[i];
the_method = _Jv_SearchMethodInClass (cls, klass, method_name,
method_signature);
if (the_method != 0)
{
found_class = cls;
break;
}
}
_Jv_Free (ifaces.list);
if (the_method != 0)
goto end_of_method_search;
}
// Finally, search superclasses.
for (jclass cls = owner->getSuperclass (); cls != 0;
cls = cls->getSuperclass ())
{
the_method = _Jv_SearchMethodInClass (cls, klass,
method_name, method_signature);
if (the_method != 0)
{
found_class = cls;
break;
}
}
end_of_method_search:
// FIXME: if (cls->loader != klass->loader), then we
// must actually check that the types of arguments
// correspond. That is, for each argument type, and
// the return type, doing _Jv_FindClassFromSignature
// with either loader should produce the same result,
// i.e., exactly the same jclass object. JVMS 5.4.3.3
if (the_method == 0)
{
java::lang::StringBuffer *sb = new java::lang::StringBuffer();
sb->append(JvNewStringLatin1("method "));
sb->append(owner->getName());
sb->append(JvNewStringLatin1("."));
sb->append(_Jv_NewStringUTF(method_name->data));
sb->append(JvNewStringLatin1(" was not found."));
throw new java::lang::NoSuchMethodError (sb->toString());
}
if (pool->tags[index] == JV_CONSTANT_InterfaceMethodref)
vtable_index = -1;
else
vtable_index = _Jv_DetermineVTableIndex (found_class, method_name,
method_signature);
if (vtable_index == METHOD_NOT_THERE)
throw_incompatible_class_change_error
(JvNewStringLatin1 ("method not found"));
pool->data[index].rmethod =
_Jv_BuildResolvedMethod(the_method,
found_class,
(the_method->accflags & Modifier::STATIC) != 0,
vtable_index);
pool->tags[index] |= JV_CONSTANT_ResolvedFlag;
}
break;
}
return pool->data[index];
}
// Find a method declared in the cls that is referenced from klass and
// perform access checks.
_Jv_Method *
_Jv_SearchMethodInClass (jclass cls, jclass klass,
_Jv_Utf8Const *method_name,
_Jv_Utf8Const *method_signature)
{
using namespace java::lang::reflect;
for (int i = 0; i < cls->method_count; i++)
{
_Jv_Method *method = &cls->methods[i];
if ( (!_Jv_equalUtf8Consts (method->name,
method_name))
|| (!_Jv_equalUtf8Consts (method->signature,
method_signature)))
continue;
if (cls == klass
|| ((method->accflags & Modifier::PUBLIC) != 0)
|| (((method->accflags & Modifier::PROTECTED) != 0)
&& cls->isAssignableFrom (klass))
|| (((method->accflags & Modifier::PRIVATE) == 0)
&& _Jv_ClassNameSamePackage (cls->name,
klass->name)))
{
return method;
}
else
{
throw new java::lang::IllegalAccessError;
}
}
return 0;
}
/** FIXME: this is a terribly inefficient algorithm! It would improve
things if compiled classes to know vtable offset, and _Jv_Method had
a field for this.
Returns METHOD_NOT_THERE if this class does not declare the given method.
Returns METHOD_INACCESSIBLE if the given method does not appear in the
vtable, i.e., it is static, private, final or a constructor.
Otherwise, returns the vtable index. */
int
_Jv_DetermineVTableIndex (jclass klass,
_Jv_Utf8Const *name,
_Jv_Utf8Const *signature)
{
using namespace java::lang::reflect;
jclass super_class = klass->getSuperclass ();
if (super_class != NULL)
{
int prev = _Jv_DetermineVTableIndex (super_class,
name,
signature);
if (prev != METHOD_NOT_THERE)
return prev;
}
/* at this point, we know that the super-class does not declare
* the method. Otherwise, the above call would have found it, and
* determined the result of this function (-1 or some positive
* number).
*/
_Jv_Method *meth = _Jv_GetMethodLocal (klass, name, signature);
/* now, if we do not declare this method, return zero */
if (meth == NULL)
return METHOD_NOT_THERE;
/* so now, we know not only that the super class does not declare the
* method, but we do! So, this is a first declaration of the method. */
/* now, the checks for things that are declared in this class, but do
* not go into the vtable. There are three cases.
* 1) the method is static, private or final
* 2) the class itself is final, or
* 3) it is the method <init>
*/
if ((meth->accflags & (Modifier::STATIC
| Modifier::PRIVATE
| Modifier::FINAL)) != 0
|| (klass->accflags & Modifier::FINAL) != 0
|| _Jv_equalUtf8Consts (name, init_name))
return METHOD_INACCESSIBLE;
/* reaching this point, we know for sure, that the method in question
* will be in the vtable. The question is where. */
/* the base offset, is where we will start assigning vtable
* indexes for this class. It is 0 for base classes
* and for non-base classes it is the
* number of entries in the super class' vtable. */
int base_offset;
if (super_class == 0)
base_offset = 0;
else
base_offset = super_class->vtable_method_count;
/* we will consider methods 0..this_method_index-1. And for each one,
* determine if it is new (i.e., if it appears in the super class),
* and if it should go in the vtable. If so, increment base_offset */
int this_method_index = meth - (&klass->methods[0]);
for (int i = 0; i < this_method_index; i++)
{
_Jv_Method *m = &klass->methods[i];
/* fist some checks for things that surely do not go in the
* vtable */
if ((m->accflags & (Modifier::STATIC | Modifier::PRIVATE)) != 0)
continue;
if (_Jv_equalUtf8Consts (m->name, init_name))
continue;
/* Then, we need to know if this method appears in the
superclass. (This is where this function gets expensive) */
_Jv_Method *sm = _Jv_LookupDeclaredMethod (super_class,
m->name,
m->signature);
/* if it was somehow declared in the superclass, skip this */
if (sm != NULL)
continue;
/* but if it is final, and not declared in the super class,
* then we also skip it */
if ((m->accflags & Modifier::FINAL) != 0)
continue;
/* finally, we can assign the index of this method */
/* m->vtable_index = base_offset */
base_offset += 1;
}
return base_offset;
}
/* this is installed in place of abstract methods */
static void
_Jv_abstractMethodError ()
{
throw new java::lang::AbstractMethodError;
}
void
_Jv_PrepareClass(jclass klass)
{
using namespace java::lang::reflect;
/*
* The job of this function is to: 1) assign storage to fields, and 2)
* build the vtable. static fields are assigned real memory, instance
* fields are assigned offsets.
*
* NOTE: we have a contract with the garbage collector here. Static
* reference fields must not be resolved, until after they have storage
* assigned which is the check used by the collector to see if it
* should indirect the static field reference and mark the object
* pointed to.
*
* Most fields are resolved lazily (i.e. have their class-type
* assigned) when they are accessed the first time by calling as part
* of _Jv_ResolveField, which is allways called after _Jv_PrepareClass.
* Static fields with initializers are resolved as part of this
* function, as are fields with primitive types.
*/
if (! _Jv_IsInterpretedClass (klass))
return;
if (klass->state >= JV_STATE_PREPARED)
return;
// Make sure super-class is linked. This involves taking a lock on
// the super class, so we use the Java method resolveClass, which
// will unlock it properly, should an exception happen. If there's
// no superclass, do nothing -- Object will already have been
// resolved.
if (klass->superclass)
java::lang::ClassLoader::resolveClass0 (klass->superclass);
_Jv_InterpClass *clz = (_Jv_InterpClass*)klass;
/************ PART ONE: OBJECT LAYOUT ***************/
int instance_size;
int static_size;
// Although java.lang.Object is never interpreted, an interface can
// have a null superclass.
if (clz->superclass)
instance_size = clz->superclass->size();
else
instance_size = java::lang::Object::class$.size();
static_size = 0;
for (int i = 0; i < clz->field_count; i++)
{
int field_size;
int field_align;
_Jv_Field *field = &clz->fields[i];
if (! field->isRef ())
{
// it's safe to resolve the field here, since it's
// a primitive class, which does not cause loading to happen.
_Jv_ResolveField (field, clz->loader);
field_size = field->type->size ();
field_align = get_alignment_from_class (field->type);
}
else
{
field_size = sizeof (jobject);
field_align = __alignof__ (jobject);
}
#ifndef COMPACT_FIELDS
field->bsize = field_size;
#endif
if (field->flags & Modifier::STATIC)
{
/* this computes an offset into a region we'll allocate
shortly, and then add this offset to the start address */
static_size = ROUND (static_size, field_align);
field->u.boffset = static_size;
static_size += field_size;
}
else
{
instance_size = ROUND (instance_size, field_align);
field->u.boffset = instance_size;
instance_size += field_size;
}
}
// set the instance size for the class
clz->size_in_bytes = instance_size;
// allocate static memory
if (static_size != 0)
{
char *static_data = (char*)_Jv_AllocBytes (static_size);
memset (static_data, 0, static_size);
for (int i = 0; i < clz->field_count; i++)
{
_Jv_Field *field = &clz->fields[i];
if ((field->flags & Modifier::STATIC) != 0)
{
field->u.addr = static_data + field->u.boffset;
if (clz->field_initializers[i] != 0)
{
_Jv_ResolveField (field, clz->loader);
_Jv_InitField (0, clz, i);
}
}
}
// now we don't need the field_initializers anymore, so let the
// collector get rid of it!
clz->field_initializers = 0;
}
/************ PART TWO: VTABLE LAYOUT ***************/
/* preparation: build the vtable stubs (even interfaces can)
have code -- for static constructors. */
for (int i = 0; i < clz->method_count; i++)
{
_Jv_MethodBase *imeth = clz->interpreted_methods[i];
if ((clz->methods[i].accflags & Modifier::NATIVE) != 0)
{
// You might think we could use a virtual `ncode' method in
// the _Jv_MethodBase and unify the native and non-native
// cases. Well, we can't, because we don't allocate these
// objects using `new', and thus they don't get a vtable.
_Jv_JNIMethod *jnim = reinterpret_cast<_Jv_JNIMethod *> (imeth);
clz->methods[i].ncode = jnim->ncode ();
}
else if (imeth != 0) // it could be abstract
{
_Jv_InterpMethod *im = reinterpret_cast<_Jv_InterpMethod *> (imeth);
_Jv_VerifyMethod (im);
clz->methods[i].ncode = im->ncode ();
}
}
if (clz->accflags & Modifier::INTERFACE)
{
clz->state = JV_STATE_PREPARED;
clz->notifyAll ();
return;
}
/* Now onto the actual job: vtable layout. First, count how many new
methods we have */
int new_method_count = 0;
jclass super_class = clz->getSuperclass ();
for (int i = 0; i < clz->method_count; i++)
{
_Jv_Method *this_meth = &clz->methods[i];
if ((this_meth->accflags & (Modifier::STATIC | Modifier::PRIVATE)) != 0
|| _Jv_equalUtf8Consts (this_meth->name, init_name))
{
/* skip this, it doesn't go in the vtable */
continue;
}
_Jv_Method *orig_meth = _Jv_LookupDeclaredMethod (super_class,
this_meth->name,
this_meth->signature);
if (orig_meth == 0)
{
// new methods that are final, also don't go in the vtable
if ((this_meth->accflags & Modifier::FINAL) != 0)
continue;
new_method_count += 1;
continue;
}
if ((orig_meth->accflags & (Modifier::STATIC
| Modifier::PRIVATE
| Modifier::FINAL)) != 0
|| ((orig_meth->accflags & Modifier::ABSTRACT) == 0
&& (this_meth->accflags & Modifier::ABSTRACT) != 0
&& (klass->accflags & Modifier::ABSTRACT) == 0))
{
clz->state = JV_STATE_ERROR;
clz->notifyAll ();
throw new java::lang::IncompatibleClassChangeError (clz->getName ());
}
/* FIXME: At this point, if (loader != super_class->loader), we
* need to "impose class loader constraints" for the types
* involved in the signature of this method */
}
/* determine size */
int vtable_count = (super_class->vtable_method_count) + new_method_count;
clz->vtable_method_count = vtable_count;
/* allocate vtable structure */
_Jv_VTable *vtable = _Jv_VTable::new_vtable (vtable_count);
vtable->clas = clz;
vtable->gc_descr = _Jv_BuildGCDescr(clz);
{
jclass effective_superclass = super_class;
/* If super_class is abstract or an interface it has no vtable.
We need to find a real one... */
while (effective_superclass && effective_superclass->vtable == NULL)
effective_superclass = effective_superclass->superclass;
/* If we ended up without a superclass, use Object. */
if (! effective_superclass)
effective_superclass = &java::lang::Object::class$;
/* copy super class' vtable entries. */
if (effective_superclass && effective_superclass->vtable)
for (int i = 0; i < effective_superclass->vtable_method_count; ++i)
vtable->set_method (i, effective_superclass->vtable->get_method (i));
}
/* now, install our own vtable entries, reprise... */
for (int i = 0; i < clz->method_count; i++)
{
_Jv_Method *this_meth = &clz->methods[i];
int index = _Jv_DetermineVTableIndex (clz,
this_meth->name,
this_meth->signature);
if (index == METHOD_NOT_THERE)
throw_internal_error ("method now found in own class");
if (index != METHOD_INACCESSIBLE)
{
if (index > clz->vtable_method_count)
throw_internal_error ("vtable problem...");
if (clz->interpreted_methods[i] == 0)
vtable->set_method(index, (void*)&_Jv_abstractMethodError);
else
vtable->set_method(index, this_meth->ncode);
}
}
/* finally, assign the vtable! */
clz->vtable = vtable;
/* wooha! we're done. */
clz->state = JV_STATE_PREPARED;
clz->notifyAll ();
}
/** Do static initialization for fields with a constant initializer */
void
_Jv_InitField (jobject obj, jclass klass, int index)
{
using namespace java::lang::reflect;
if (obj != 0 && klass == 0)
klass = obj->getClass ();
if (!_Jv_IsInterpretedClass (klass))
return;
_Jv_InterpClass *clz = (_Jv_InterpClass*)klass;
_Jv_Field * field = (&clz->fields[0]) + index;
if (index > clz->field_count)
throw_internal_error ("field out of range");
int init = clz->field_initializers[index];
if (init == 0)
return;
_Jv_Constants *pool = &clz->constants;
int tag = pool->tags[init];
if (! field->isResolved ())
throw_internal_error ("initializing unresolved field");
if (obj==0 && ((field->flags & Modifier::STATIC) == 0))
throw_internal_error ("initializing non-static field with no object");
void *addr = 0;
if ((field->flags & Modifier::STATIC) != 0)
addr = (void*) field->u.addr;
else
addr = (void*) (((char*)obj) + field->u.boffset);
switch (tag)
{
case JV_CONSTANT_String:
{
_Jv_MonitorEnter (clz);
jstring str;
str = _Jv_NewStringUtf8Const (pool->data[init].utf8);
pool->data[init].string = str;
pool->tags[init] = JV_CONSTANT_ResolvedString;
_Jv_MonitorExit (clz);
}
/* fall through */
case JV_CONSTANT_ResolvedString:
if (! (field->type == &StringClass
|| field->type == &java::lang::Class::class$))
throw_class_format_error ("string initialiser to non-string field");
*(jstring*)addr = pool->data[init].string;
break;
case JV_CONSTANT_Integer:
{
int value = pool->data[init].i;
if (field->type == JvPrimClass (boolean))
*(jboolean*)addr = (jboolean)value;
else if (field->type == JvPrimClass (byte))
*(jbyte*)addr = (jbyte)value;
else if (field->type == JvPrimClass (char))
*(jchar*)addr = (jchar)value;
else if (field->type == JvPrimClass (short))
*(jshort*)addr = (jshort)value;
else if (field->type == JvPrimClass (int))
*(jint*)addr = (jint)value;
else
throw_class_format_error ("erroneous field initializer");
}
break;
case JV_CONSTANT_Long:
if (field->type != JvPrimClass (long))
throw_class_format_error ("erroneous field initializer");
*(jlong*)addr = _Jv_loadLong (&pool->data[init]);
break;
case JV_CONSTANT_Float:
if (field->type != JvPrimClass (float))
throw_class_format_error ("erroneous field initializer");
*(jfloat*)addr = pool->data[init].f;
break;
case JV_CONSTANT_Double:
if (field->type != JvPrimClass (double))
throw_class_format_error ("erroneous field initializer");
*(jdouble*)addr = _Jv_loadDouble (&pool->data[init]);
break;
default:
throw_class_format_error ("erroneous field initializer");
}
}
static int
get_alignment_from_class (jclass klass)
{
if (klass == JvPrimClass (byte))
return __alignof__ (jbyte);
else if (klass == JvPrimClass (short))
return __alignof__ (jshort);
else if (klass == JvPrimClass (int))
return __alignof__ (jint);
else if (klass == JvPrimClass (long))
return __alignof__ (jlong);
else if (klass == JvPrimClass (boolean))
return __alignof__ (jboolean);
else if (klass == JvPrimClass (char))
return __alignof__ (jchar);
else if (klass == JvPrimClass (float))
return __alignof__ (jfloat);
else if (klass == JvPrimClass (double))
return __alignof__ (jdouble);
else
return __alignof__ (jobject);
}
inline static unsigned char*
skip_one_type (unsigned char* ptr)
{
int ch = *ptr++;
while (ch == '[')
{
ch = *ptr++;
}
if (ch == 'L')
{
do { ch = *ptr++; } while (ch != ';');
}
return ptr;
}
static ffi_type*
get_ffi_type_from_signature (unsigned char* ptr)
{
switch (*ptr)
{
case 'L':
case '[':
return &ffi_type_pointer;
break;
case 'Z':
// On some platforms a bool is a byte, on others an int.
if (sizeof (jboolean) == sizeof (jbyte))
return &ffi_type_sint8;
else
{
JvAssert (sizeof (jbyte) == sizeof (jint));
return &ffi_type_sint32;
}
break;
case 'B':
return &ffi_type_sint8;
break;
case 'C':
return &ffi_type_uint16;
break;
case 'S':
return &ffi_type_sint16;
break;
case 'I':
return &ffi_type_sint32;
break;
case 'J':
return &ffi_type_sint64;
break;
case 'F':
return &ffi_type_float;
break;
case 'D':
return &ffi_type_double;
break;
case 'V':
return &ffi_type_void;
break;
}
throw_internal_error ("unknown type in signature");
}
/* this function yields the number of actual arguments, that is, if the
* function is non-static, then one is added to the number of elements
* found in the signature */
int
_Jv_count_arguments (_Jv_Utf8Const *signature,
jboolean staticp)
{
unsigned char *ptr = (unsigned char*) signature->data;
int arg_count = staticp ? 0 : 1;
/* first, count number of arguments */
// skip '('
ptr++;
// count args
while (*ptr != ')')
{
ptr = skip_one_type (ptr);
arg_count += 1;
}
return arg_count;
}
/* This beast will build a cif, given the signature. Memory for
* the cif itself and for the argument types must be allocated by the
* caller.
*/
static int
init_cif (_Jv_Utf8Const* signature,
int arg_count,
jboolean staticp,
ffi_cif *cif,
ffi_type **arg_types,
ffi_type **rtype_p)
{
unsigned char *ptr = (unsigned char*) signature->data;
int arg_index = 0; // arg number
int item_count = 0; // stack-item count
// setup receiver
if (!staticp)
{
arg_types[arg_index++] = &ffi_type_pointer;
item_count += 1;
}
// skip '('
ptr++;
// assign arg types
while (*ptr != ')')
{
arg_types[arg_index++] = get_ffi_type_from_signature (ptr);
if (*ptr == 'J' || *ptr == 'D')
item_count += 2;
else
item_count += 1;
ptr = skip_one_type (ptr);
}
// skip ')'
ptr++;
ffi_type *rtype = get_ffi_type_from_signature (ptr);
ptr = skip_one_type (ptr);
if (ptr != (unsigned char*)signature->data + signature->length)
throw_internal_error ("did not find end of signature");
if (ffi_prep_cif (cif, FFI_DEFAULT_ABI,
arg_count, rtype, arg_types) != FFI_OK)
throw_internal_error ("ffi_prep_cif failed");
if (rtype_p != NULL)
*rtype_p = rtype;
return item_count;
}
#if FFI_NATIVE_RAW_API
# define FFI_PREP_RAW_CLOSURE ffi_prep_raw_closure
# define FFI_RAW_SIZE ffi_raw_size
#else
# define FFI_PREP_RAW_CLOSURE ffi_prep_java_raw_closure
# define FFI_RAW_SIZE ffi_java_raw_size
#endif
/* we put this one here, and not in interpret.cc because it
* calls the utility routines _Jv_count_arguments
* which are static to this module. The following struct defines the
* layout we use for the stubs, it's only used in the ncode method. */
typedef struct {
ffi_raw_closure closure;
ffi_cif cif;
ffi_type *arg_types[0];
} ncode_closure;
typedef void (*ffi_closure_fun) (ffi_cif*,void*,ffi_raw*,void*);
void *
_Jv_InterpMethod::ncode ()
{
using namespace java::lang::reflect;
if (self->ncode != 0)
return self->ncode;
jboolean staticp = (self->accflags & Modifier::STATIC) != 0;
int arg_count = _Jv_count_arguments (self->signature, staticp);
ncode_closure *closure =
(ncode_closure*)_Jv_AllocBytes (sizeof (ncode_closure)
+ arg_count * sizeof (ffi_type*));
init_cif (self->signature,
arg_count,
staticp,
&closure->cif,
&closure->arg_types[0],
NULL);
ffi_closure_fun fun;
args_raw_size = FFI_RAW_SIZE (&closure->cif);
JvAssert ((self->accflags & Modifier::NATIVE) == 0);
if ((self->accflags & Modifier::SYNCHRONIZED) != 0)
{
if (staticp)
fun = (ffi_closure_fun)&_Jv_InterpMethod::run_synch_class;
else
fun = (ffi_closure_fun)&_Jv_InterpMethod::run_synch_object;
}
else
{
fun = (ffi_closure_fun)&_Jv_InterpMethod::run_normal;
}
FFI_PREP_RAW_CLOSURE (&closure->closure,
&closure->cif,
fun,
(void*)this);
self->ncode = (void*)closure;
return self->ncode;
}
void *
_Jv_JNIMethod::ncode ()
{
using namespace java::lang::reflect;
if (self->ncode != 0)
return self->ncode;
jboolean staticp = (self->accflags & Modifier::STATIC) != 0;
int arg_count = _Jv_count_arguments (self->signature, staticp);
ncode_closure *closure =
(ncode_closure*)_Jv_AllocBytes (sizeof (ncode_closure)
+ arg_count * sizeof (ffi_type*));
ffi_type *rtype;
init_cif (self->signature,
arg_count,
staticp,
&closure->cif,
&closure->arg_types[0],
&rtype);
ffi_closure_fun fun;
args_raw_size = FFI_RAW_SIZE (&closure->cif);
// Initialize the argument types and CIF that represent the actual
// underlying JNI function.
int extra_args = 1;
if ((self->accflags & Modifier::STATIC))
++extra_args;
jni_arg_types = (ffi_type **) _Jv_Malloc ((extra_args + arg_count)
* sizeof (ffi_type *));
int offset = 0;
jni_arg_types[offset++] = &ffi_type_pointer;
if ((self->accflags & Modifier::STATIC))
jni_arg_types[offset++] = &ffi_type_pointer;
memcpy (&jni_arg_types[offset], &closure->arg_types[0],
arg_count * sizeof (ffi_type *));
if (ffi_prep_cif (&jni_cif, FFI_DEFAULT_ABI,
extra_args + arg_count, rtype,
jni_arg_types) != FFI_OK)
throw_internal_error ("ffi_prep_cif failed for JNI function");
JvAssert ((self->accflags & Modifier::NATIVE) != 0);
// FIXME: for now we assume that all native methods for
// interpreted code use JNI.
fun = (ffi_closure_fun) &_Jv_JNIMethod::call;
FFI_PREP_RAW_CLOSURE (&closure->closure,
&closure->cif,
fun,
(void*) this);
self->ncode = (void *) closure;
return self->ncode;
}
/* A _Jv_ResolvedMethod is what is put in the constant pool for a
* MethodRef or InterfacemethodRef. */
static _Jv_ResolvedMethod*
_Jv_BuildResolvedMethod (_Jv_Method* method,
jclass klass,
jboolean staticp,
jint vtable_index)
{
int arg_count = _Jv_count_arguments (method->signature, staticp);
_Jv_ResolvedMethod* result = (_Jv_ResolvedMethod*)
_Jv_AllocBytes (sizeof (_Jv_ResolvedMethod)
+ arg_count*sizeof (ffi_type*));
result->stack_item_count
= init_cif (method->signature,
arg_count,
staticp,
&result->cif,
&result->arg_types[0],
NULL);
result->vtable_index = vtable_index;
result->method = method;
result->klass = klass;
return result;
}
static void
throw_class_format_error (jstring msg)
{
throw (msg
? new java::lang::ClassFormatError (msg)
: new java::lang::ClassFormatError);
}
static void
throw_class_format_error (char *msg)
{
throw_class_format_error (JvNewStringLatin1 (msg));
}
static void
throw_internal_error (char *msg)
{
throw new java::lang::InternalError (JvNewStringLatin1 (msg));
}
#endif /* INTERPRETER */
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