JavaMemberDescriptor *
jsj_GetJavaMemberDescriptor(JSContext *cx,
JNIEnv *jEnv,
JavaClassDescriptor *class_descriptor,
jstring member_name_jstr)
{
JavaMemberDescriptor *member_descriptor;
jsid id;
if (!JavaStringToId(cx, jEnv, member_name_jstr, &id))
return NULL;
member_descriptor = jsj_LookupJavaMemberDescriptorById(cx, jEnv, class_descriptor, id);
if (member_descriptor)
return member_descriptor;
member_descriptor = JS_malloc(cx, sizeof(JavaMemberDescriptor));
if (!member_descriptor)
return NULL;
memset(member_descriptor, 0, sizeof(JavaMemberDescriptor));
member_descriptor->name = jsj_DupJavaStringUTF(cx, jEnv, member_name_jstr);
if (!member_descriptor->name) {
JS_free(cx, member_descriptor);
return NULL;
}
member_descriptor->id = id;
member_descriptor->next = class_descriptor->instance_members;
class_descriptor->instance_members = member_descriptor;
return member_descriptor;
}
/*
* Given a JVM handle to a java.lang.Class object, malloc a C-string
* containing the UTF8 encoding of the fully qualified name of the class.
* It's the caller's responsibility to free the returned string.
*
* If an error occurs, NULL is returned and the error reporter called.
*/
const char *
jsj_GetJavaClassName(JSContext *cx, JNIEnv *jEnv, jclass java_class)
{
jstring java_class_name_jstr;
const char *java_class_name;
/* Get java.lang.String object containing class name */
java_class_name_jstr =
(*jEnv)->CallObjectMethod(jEnv, java_class, jlClass_getName);
if (!java_class_name_jstr)
goto error;
/* Fix bugzilla #183092
* It is necessary to check Exception from JPI
* even though java_class_name_jstr != null */
#ifdef XP_UNIX
if ((*jEnv)->ExceptionOccurred(jEnv))
goto error;
#endif
/* Convert to UTF8 encoding and copy */
java_class_name = jsj_DupJavaStringUTF(cx, jEnv, java_class_name_jstr);
(*jEnv)->DeleteLocalRef(jEnv, java_class_name_jstr);
return java_class_name;
error:
jsj_UnexpectedJavaError(cx, jEnv, "Can't get Java class name using"
"java.lang.Class.getName()");
return NULL;
}
/*
* Return, as a C string, the JVM stack trace associated with a Java
* exception, as would be printed by java.lang.Throwable.printStackTrace().
* The caller is responsible for free'ing the returned string.
*
* Returns NULL if an error occurs.
*/
static const char *
get_java_stack_trace(JSContext *cx, JNIEnv *jEnv, jthrowable java_exception)
{
const char *backtrace;
jstring backtrace_jstr;
backtrace = NULL;
if (java_exception && njJSUtil_getStackTrace) {
backtrace_jstr = (*jEnv)->CallStaticObjectMethod(jEnv, njJSUtil,
njJSUtil_getStackTrace,
java_exception);
if (!backtrace_jstr) {
jsj_UnexpectedJavaError(cx, jEnv, "Unable to get exception stack trace");
return NULL;
}
backtrace = jsj_DupJavaStringUTF(cx, jEnv, backtrace_jstr);
(*jEnv)->DeleteLocalRef(jEnv, backtrace_jstr);
}
return backtrace;
}
/*
* Add a single field, described by java_field, to the JavaMemberDescriptor
* named by field_name within the given JavaClassDescriptor.
*
* Returns JS_TRUE on success. Otherwise, returns JS_FALSE and reports an error.
*/
static JSBool
add_java_field_to_class_descriptor(JSContext *cx,
JNIEnv *jEnv,
JavaClassDescriptor *class_descriptor,
jstring field_name_jstr,
jobject java_field, /* a java.lang.reflect.Field */
jint modifiers)
{
jclass fieldType;
jfieldID fieldID;
jclass java_class;
JSBool is_static_field;
JavaMemberDescriptor *member_descriptor = NULL;
const char *sig_cstr = NULL;
const char *field_name = NULL;
JavaSignature *signature = NULL;
JavaFieldSpec *field_spec = NULL;
is_static_field = modifiers & ACC_STATIC;
if (is_static_field) {
member_descriptor = jsj_GetJavaStaticMemberDescriptor(cx, jEnv, class_descriptor, field_name_jstr);
} else {
member_descriptor = jsj_GetJavaMemberDescriptor(cx, jEnv, class_descriptor, field_name_jstr);
}
if (!member_descriptor)
goto error;
field_spec = (JavaFieldSpec*)JS_malloc(cx, sizeof(JavaFieldSpec));
if (!field_spec)
goto error;
field_spec->modifiers = modifiers;
/* Get the Java class corresponding to the type of the field */
fieldType = (*jEnv)->CallObjectMethod(jEnv, java_field, jlrField_getType);
if (!fieldType) {
jsj_UnexpectedJavaError(cx, jEnv,
"Unable to determine type of field using"
" java.lang.reflect.Field.getType()");
goto error;
}
signature = jsj_GetJavaClassDescriptor(cx, jEnv, fieldType);
(*jEnv)->DeleteLocalRef(jEnv, fieldType);
if (!signature)
goto error;
field_spec->signature = signature;
field_name = jsj_DupJavaStringUTF(cx, jEnv, field_name_jstr);
if (!field_name)
goto error;
field_spec->name = field_name;
/* Compute the JNI-style (string-based) signature of the field type */
sig_cstr = jsj_ConvertJavaSignatureToString(cx, signature);
if (!sig_cstr)
goto error;
/* Compute the JNI fieldID and cache it for quick field access */
java_class = class_descriptor->java_class;
if (is_static_field)
fieldID = (*jEnv)->GetStaticFieldID(jEnv, java_class, field_name, sig_cstr);
else
fieldID = (*jEnv)->GetFieldID(jEnv, java_class, field_name, sig_cstr);
if (!fieldID) {
jsj_UnexpectedJavaError(cx, jEnv,
"Can't get Java field ID for class %s, field %s (sig=%s)",
class_descriptor->name, field_name, sig_cstr);
goto error;
}
field_spec->fieldID = fieldID;
JS_free(cx, (char*)sig_cstr);
member_descriptor->field = field_spec;
/* Success */
return JS_TRUE;
error:
if (field_spec) {
JS_FREE_IF(cx, (char*)field_spec->name);
JS_free(cx, field_spec);
}
JS_FREE_IF(cx, (char*)sig_cstr);
if (signature)
jsj_ReleaseJavaClassDescriptor(cx, jEnv, signature);
return JS_FALSE;
}
