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|
/*
* mono-error.c: Error handling code
*
* Authors:
* Rodrigo Kumpera (rkumpera@novell.com)
* Copyright 2009 Novell, Inc (http://www.novell.com)
*/
#include <glib.h>
#include "mono-error.h"
#include "mono-error-internals.h"
#include <mono/metadata/exception.h>
#include <mono/metadata/class-internals.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/object.h>
#include <mono/metadata/object-internals.h>
#define set_error_message() do { \
va_list args; \
va_start (args, msg_format); \
if (!(error->full_message = g_strdup_vprintf (msg_format, args))) \
error->flags |= MONO_ERROR_INCOMPLETE; \
va_end (args); \
} while (0)
static gboolean
is_managed_exception (MonoErrorInternal *error)
{
return (error->error_code == MONO_ERROR_EXCEPTION_INSTANCE);
}
static void
mono_error_prepare (MonoErrorInternal *error)
{
if (error->error_code != MONO_ERROR_NONE)
return;
error->type_name = error->assembly_name = error->member_name = error->full_message = error->exception_name_space = error->exception_name = error->full_message_with_fields = error->first_argument = NULL;
error->exn.klass = NULL;
}
static MonoClass*
get_class (MonoErrorInternal *error)
{
MonoClass *klass = NULL;
if (is_managed_exception (error))
klass = mono_object_class (mono_gchandle_get_target (error->exn.instance_handle));
else
klass = error->exn.klass;
return klass;
}
static const char*
get_type_name (MonoErrorInternal *error)
{
if (error->type_name)
return error->type_name;
MonoClass *klass = get_class (error);
if (klass)
return klass->name;
return "<unknown type>";
}
static const char*
get_assembly_name (MonoErrorInternal *error)
{
if (error->assembly_name)
return error->assembly_name;
MonoClass *klass = get_class (error);
if (klass && klass->image)
return klass->image->name;
return "<unknown assembly>";
}
void
mono_error_init_flags (MonoError *oerror, unsigned short flags)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
g_assert (sizeof (MonoError) == sizeof (MonoErrorInternal));
error->error_code = MONO_ERROR_NONE;
error->flags = flags;
}
void
mono_error_init (MonoError *error)
{
mono_error_init_flags (error, 0);
}
void
mono_error_cleanup (MonoError *oerror)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
if (error->error_code == MONO_ERROR_NONE)
return;
if (is_managed_exception (error))
mono_gchandle_free (error->exn.instance_handle);
g_free ((char*)error->full_message);
g_free ((char*)error->full_message_with_fields);
if (!(error->flags & MONO_ERROR_FREE_STRINGS)) //no memory was allocated
return;
g_free ((char*)error->type_name);
g_free ((char*)error->assembly_name);
g_free ((char*)error->member_name);
g_free ((char*)error->exception_name_space);
g_free ((char*)error->exception_name);
g_free ((char*)error->first_argument);
}
gboolean
mono_error_ok (MonoError *error)
{
return error->error_code == MONO_ERROR_NONE;
}
void
mono_error_assert_ok (MonoError *error)
{
if (mono_error_ok (error))
return;
g_error ("%s\n", mono_error_get_message (error));
}
unsigned short
mono_error_get_error_code (MonoError *error)
{
return error->error_code;
}
/*Return a pointer to the internal error message, might be NULL.
Caller should not release it.*/
const char*
mono_error_get_message (MonoError *oerror)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
if (error->error_code == MONO_ERROR_NONE)
return NULL;
if (error->full_message_with_fields)
return error->full_message_with_fields;
error->full_message_with_fields = g_strdup_printf ("%s assembly:%s type:%s member:%s",
error->full_message,
get_assembly_name (error),
get_type_name (error),
error->member_name ? error->member_name : "<none>");
return error->full_message_with_fields ? error->full_message_with_fields : error->full_message;
}
/*
* Inform that this error has heap allocated strings.
* The strings will be duplicated if @dup_strings is TRUE
* otherwise they will just be free'd in mono_error_cleanup.
*/
void
mono_error_dup_strings (MonoError *oerror, gboolean dup_strings)
{
#define DUP_STR(field) do { if (error->field) {\
if (!(error->field = g_strdup (error->field))) \
error->flags |= MONO_ERROR_INCOMPLETE; \
}} while (0);
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
error->flags |= MONO_ERROR_FREE_STRINGS;
if (dup_strings) {
DUP_STR (type_name);
DUP_STR (assembly_name);
DUP_STR (member_name);
DUP_STR (exception_name_space);
DUP_STR (exception_name);
DUP_STR (first_argument);
}
#undef DUP_STR
}
void
mono_error_set_error (MonoError *oerror, int error_code, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = error_code;
set_error_message ();
}
static void
mono_error_set_assembly_name (MonoError *oerror, const char *assembly_name)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
g_assert (error->error_code != MONO_ERROR_NONE);
error->assembly_name = assembly_name;
}
static void
mono_error_set_member_name (MonoError *oerror, const char *member_name)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
error->member_name = member_name;
}
static void
mono_error_set_type_name (MonoError *oerror, const char *type_name)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
error->type_name = type_name;
}
static void
mono_error_set_class (MonoError *oerror, MonoClass *klass)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
if (is_managed_exception (error))
return;
error->exn.klass = klass;
}
static void
mono_error_set_corlib_exception (MonoError *oerror, const char *name_space, const char *name)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
error->exception_name_space = name_space;
error->exception_name = name;
}
void
mono_error_set_assembly_load (MonoError *oerror, const char *assembly_name, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_FILE_NOT_FOUND;
mono_error_set_assembly_name (oerror, assembly_name);
set_error_message ();
}
void
mono_error_set_assembly_load_simple (MonoError *oerror, const char *assembly_name, gboolean refection_only)
{
if (refection_only)
mono_error_set_assembly_load (oerror, assembly_name, "Cannot resolve dependency to assembly because it has not been preloaded. When using the ReflectionOnly APIs, dependent assemblies must be pre-loaded or loaded on demand through the ReflectionOnlyAssemblyResolve event.");
else
mono_error_set_assembly_load (oerror, assembly_name, "Could not load file or assembly or one of its dependencies.");
}
void
mono_error_set_type_load_class (MonoError *oerror, MonoClass *klass, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_TYPE_LOAD;
mono_error_set_class (oerror, klass);
set_error_message ();
}
/*
* Different than other functions, this one here assumes that type_name and assembly_name to have been allocated just for us.
* Which means mono_error_cleanup will free them.
*/
void
mono_error_set_type_load_name (MonoError *oerror, const char *type_name, const char *assembly_name, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_TYPE_LOAD;
mono_error_set_type_name (oerror, type_name);
mono_error_set_assembly_name (oerror, assembly_name);
mono_error_dup_strings (oerror, FALSE);
set_error_message ();
}
void
mono_error_set_method_load (MonoError *oerror, MonoClass *klass, const char *method_name, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_MISSING_METHOD;
mono_error_set_class (oerror, klass);
mono_error_set_member_name (oerror, method_name);
set_error_message ();
}
void
mono_error_set_field_load (MonoError *oerror, MonoClass *klass, const char *field_name, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_MISSING_FIELD;
mono_error_set_class (oerror, klass);
mono_error_set_member_name (oerror, field_name);
set_error_message ();
}
void
mono_error_set_bad_image_name (MonoError *oerror, const char *assembly_name, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_BAD_IMAGE;
mono_error_set_assembly_name (oerror, assembly_name);
set_error_message ();
}
void
mono_error_set_bad_image (MonoError *oerror, MonoImage *image, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_BAD_IMAGE;
error->assembly_name = image ? mono_image_get_name (image) : "<no_image>";
set_error_message ();
}
void
mono_error_set_generic_error (MonoError *oerror, const char * name_space, const char *name, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_GENERIC;
mono_error_set_corlib_exception (oerror, name_space, name);
set_error_message ();
}
void
mono_error_set_exception_instance (MonoError *oerror, MonoException *exc)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_EXCEPTION_INSTANCE;
error->exn.instance_handle = mono_gchandle_new (exc ? &exc->object : NULL, FALSE);
}
void
mono_error_set_from_loader_error (MonoError *oerror)
{
MonoLoaderError *loader_error = mono_loader_get_last_error ();
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
gboolean dup_strings = TRUE;
mono_error_prepare (error);
if (!loader_error) {
mono_error_set_generic_error (oerror, "System", "ExecutionEngineException", "Runtime tried to produce a mono-error from an empty loader-error");
return;
}
switch (loader_error->exception_type) {
case MONO_EXCEPTION_NONE:
mono_error_set_generic_error (oerror, "System", "ExecutionEngineException", "Runtime tried to produce a mono-error from a non-error loader-error");
break;
case MONO_EXCEPTION_INVALID_PROGRAM:
mono_error_set_generic_error (oerror, "System", "InvalidProgramException", "Failed for unknown reasons.");
break;
case MONO_EXCEPTION_UNVERIFIABLE_IL:
mono_error_set_generic_error (oerror, "System.Security", "VerificationException", "Failed for unknown reasons.");
break;
case MONO_EXCEPTION_MISSING_METHOD:
error->error_code = MONO_ERROR_MISSING_METHOD;
mono_error_set_type_name (oerror, loader_error->class_name);
mono_error_set_member_name (oerror, loader_error->member_name);
error->full_message = g_strdup ("Failed for unknown reasons.");
break;
case MONO_EXCEPTION_MISSING_FIELD:
mono_error_set_field_load (oerror, loader_error->klass, loader_error->member_name, "Failed for unknown reasons.");
break;
case MONO_EXCEPTION_TYPE_LOAD:
mono_error_set_type_load_name (oerror, g_strdup (loader_error->class_name), g_strdup (loader_error->assembly_name), "Failed for unknown reasons.");
dup_strings = FALSE;
break;
case MONO_EXCEPTION_FILE_NOT_FOUND:
mono_error_set_assembly_load_simple (oerror, loader_error->assembly_name, loader_error->ref_only);
break;
case MONO_EXCEPTION_METHOD_ACCESS:
mono_error_set_generic_error (oerror, "System", "MethodAccessException", "Failed for unknown reasons.");
break;
case MONO_EXCEPTION_FIELD_ACCESS:
mono_error_set_generic_error (oerror, "System", "FieldAccessException", "Failed for unknown reasons.");
break;
case MONO_EXCEPTION_OBJECT_SUPPLIED:
case MONO_EXCEPTION_GENERIC_SHARING_FAILED:
mono_error_set_generic_error (oerror, "System", "ExecutionEngineException", "Runtime tried to produce a mono-error from JIT internal error %d", loader_error->exception_type);
break;
case MONO_EXCEPTION_BAD_IMAGE:
mono_error_set_bad_image_name (oerror, "<unknown>", "%s", loader_error->msg);
break;
case MONO_EXCEPTION_OUT_OF_MEMORY:
mono_error_set_out_of_memory (oerror, "Failed for unknown reasons.");
break;
default:
mono_error_set_generic_error (oerror, "System", "ExecutionEngineException", "Runtime tried to produce an unknown loader-error %d", loader_error->exception_type);
break;
}
mono_error_dup_strings (oerror, dup_strings);
mono_loader_clear_error ();
}
void
mono_loader_set_error_from_mono_error (MonoError *oerror)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
switch (error->error_code) {
case MONO_ERROR_MISSING_METHOD:
mono_loader_set_error_method_load (get_type_name (error), error->member_name);
break;
case MONO_ERROR_MISSING_FIELD:
mono_loader_set_error_field_load (error->exn.klass, error->member_name);
break;
case MONO_ERROR_TYPE_LOAD:
mono_loader_set_error_type_load (get_type_name (error), get_assembly_name (error));
break;
case MONO_ERROR_FILE_NOT_FOUND:
/* XXX can't recover if it's ref only or not */
mono_loader_set_error_assembly_load (get_assembly_name (error), FALSE);
break;
case MONO_ERROR_BAD_IMAGE:
mono_loader_set_error_bad_image (g_strdup (error->full_message));
break;
case MONO_ERROR_EXCEPTION_INSTANCE:
mono_loader_set_error_bad_image (g_strdup_printf ("Non translatable error"));
default:
mono_loader_set_error_bad_image (g_strdup_printf ("Non translatable error: %s", error->full_message));
}
}
void
mono_error_set_out_of_memory (MonoError *oerror, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_OUT_OF_MEMORY;
set_error_message ();
}
void
mono_error_set_argument (MonoError *oerror, const char *argument, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_ARGUMENT;
error->first_argument = argument;
set_error_message ();
}
void
mono_error_set_not_verifiable (MonoError *oerror, MonoMethod *method, const char *msg_format, ...)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
mono_error_prepare (error);
error->error_code = MONO_ERROR_NOT_VERIFIABLE;
if (method) {
mono_error_set_class (oerror, method->klass);
mono_error_set_member_name (oerror, mono_method_full_name (method, 1));
}
set_error_message ();
}
static MonoString*
get_type_name_as_mono_string (MonoErrorInternal *error, MonoDomain *domain, MonoError *error_out)
{
MonoString* res = NULL;
if (error->type_name) {
res = mono_string_new (domain, error->type_name);
} else {
MonoClass *klass = get_class (error);
if (klass) {
char *name = mono_type_full_name (&klass->byval_arg);
if (name) {
res = mono_string_new (domain, name);
g_free (name);
}
}
}
if (!res)
mono_error_set_out_of_memory (error_out, "Could not allocate type name");
return res;
}
static void
set_message_on_exception (MonoException *exception, MonoErrorInternal *error, MonoError *error_out)
{
MonoString *msg = mono_string_new (mono_domain_get (), error->full_message);
if (msg)
MONO_OBJECT_SETREF (exception, message, msg);
else
mono_error_set_out_of_memory (error_out, "Could not allocate exception object");
}
/*Can fail with out-of-memory*/
MonoException*
mono_error_prepare_exception (MonoError *oerror, MonoError *error_out)
{
MonoErrorInternal *error = (MonoErrorInternal*)oerror;
MonoException* exception = NULL;
MonoString *assembly_name = NULL, *type_name = NULL, *method_name = NULL, *field_name = NULL, *msg = NULL;
MonoDomain *domain = mono_domain_get ();
mono_error_init (error_out);
switch (error->error_code) {
case MONO_ERROR_NONE:
return NULL;
case MONO_ERROR_MISSING_METHOD:
if ((error->type_name || error->exn.klass) && error->member_name) {
type_name = get_type_name_as_mono_string (error, domain, error_out);
if (!mono_error_ok (error_out))
break;
method_name = mono_string_new (domain, error->member_name);
if (!method_name) {
mono_error_set_out_of_memory (error_out, "Could not allocate method name");
break;
}
exception = mono_exception_from_name_two_strings (mono_defaults.corlib, "System", "MissingMethodException", type_name, method_name);
if (exception)
set_message_on_exception (exception, error, error_out);
} else {
exception = mono_exception_from_name_msg (mono_defaults.corlib, "System", "MissingMethodException", error->full_message);
}
break;
case MONO_ERROR_MISSING_FIELD:
if ((error->type_name || error->exn.klass) && error->member_name) {
type_name = get_type_name_as_mono_string (error, domain, error_out);
if (!mono_error_ok (error_out))
break;
field_name = mono_string_new (domain, error->member_name);
if (!field_name) {
mono_error_set_out_of_memory (error_out, "Could not allocate field name");
break;
}
exception = mono_exception_from_name_two_strings (mono_defaults.corlib, "System", "MissingFieldException", type_name, field_name);
if (exception)
set_message_on_exception (exception, error, error_out);
} else {
exception = mono_exception_from_name_msg (mono_defaults.corlib, "System", "MissingFieldException", error->full_message);
}
break;
case MONO_ERROR_TYPE_LOAD:
if (error->type_name || error->assembly_name) {
type_name = get_type_name_as_mono_string (error, domain, error_out);
if (!mono_error_ok (error_out))
break;
if (error->assembly_name) {
assembly_name = mono_string_new (domain, error->assembly_name);
if (!assembly_name) {
mono_error_set_out_of_memory (error_out, "Could not allocate assembly name");
break;
}
}
exception = mono_exception_from_name_two_strings (mono_get_corlib (), "System", "TypeLoadException", type_name, assembly_name);
if (exception)
set_message_on_exception (exception, error, error_out);
} else {
exception = mono_exception_from_name_msg (mono_defaults.corlib, "System", "TypeLoadException", error->full_message);
}
break;
case MONO_ERROR_FILE_NOT_FOUND:
case MONO_ERROR_BAD_IMAGE:
if (error->assembly_name) {
msg = mono_string_new (domain, error->full_message);
if (!msg) {
mono_error_set_out_of_memory (error_out, "Could not allocate message");
break;
}
if (error->assembly_name) {
assembly_name = mono_string_new (domain, error->assembly_name);
if (!assembly_name) {
mono_error_set_out_of_memory (error_out, "Could not allocate assembly name");
break;
}
}
if (error->error_code == MONO_ERROR_FILE_NOT_FOUND)
exception = mono_exception_from_name_two_strings (mono_get_corlib (), "System.IO", "FileNotFoundException", msg, assembly_name);
else
exception = mono_exception_from_name_two_strings (mono_defaults.corlib, "System", "BadImageFormatException", msg, assembly_name);
} else {
if (error->error_code == MONO_ERROR_FILE_NOT_FOUND)
exception = mono_exception_from_name_msg (mono_get_corlib (), "System.IO", "FileNotFoundException", error->full_message);
else
exception = mono_exception_from_name_msg (mono_defaults.corlib, "System", "BadImageFormatException", error->full_message);
}
break;
case MONO_ERROR_OUT_OF_MEMORY:
exception = mono_get_exception_out_of_memory ();
break;
case MONO_ERROR_ARGUMENT:
exception = mono_get_exception_argument (error->first_argument, error->full_message);
break;
case MONO_ERROR_NOT_VERIFIABLE: {
char *type_name = NULL, *message;
if (error->exn.klass) {
type_name = mono_type_get_full_name (error->exn.klass);
if (!type_name) {
mono_error_set_out_of_memory (error_out, "Could not allocate message");
break;
}
}
message = g_strdup_printf ("Error in %s:%s %s", type_name, error->member_name, error->full_message);
if (!message) {
g_free (type_name);
mono_error_set_out_of_memory (error_out, "Could not allocate message");
break;
}
exception = mono_exception_from_name_msg (mono_defaults.corlib, "System.Security", "VerificationException", message);
g_free (message);
g_free (type_name);
break;
}
case MONO_ERROR_GENERIC:
if (!error->exception_name_space || !error->exception_name)
mono_error_set_generic_error (error_out, "System", "ExecutionEngineException", "MonoError with generic error but no exception name was supplied");
else
exception = mono_exception_from_name_msg (mono_defaults.corlib, error->exception_name_space, error->exception_name, error->full_message);
break;
case MONO_ERROR_EXCEPTION_INSTANCE:
exception = (MonoException*) mono_gchandle_get_target (error->exn.instance_handle);
break;
default:
mono_error_set_generic_error (error_out, "System", "ExecutionEngineException", "Invalid error-code %d", error->error_code);
}
if (!mono_error_ok (error_out))
return NULL;
if (!exception)
mono_error_set_out_of_memory (error_out, "Could not allocate exception object");
return exception;
}
/*
Convert this MonoError to an exception if it's faulty or return NULL.
The error object is cleant after.
*/
MonoException*
mono_error_convert_to_exception (MonoError *target_error)
{
MonoError error;
MonoException *ex;
if (mono_error_ok (target_error))
return NULL;
ex = mono_error_prepare_exception (target_error, &error);
if (!mono_error_ok (&error)) {
MonoError second_chance;
/*Try to produce the exception for the second error. FIXME maybe we should log about the original one*/
ex = mono_error_prepare_exception (&error, &second_chance);
g_assert (mono_error_ok (&second_chance)); /*We can't reasonable handle double faults, maybe later.*/
mono_error_cleanup (&error);
}
mono_error_cleanup (target_error);
return ex;
}
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