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https://github.com/yuzu-emu/unicorn.git
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97ad660361
This is particularly useful when we abort in error_propagate(), because there the stack backtrace doesn't lead to where the error was created. Looks like this: Unexpected error in parse_block_error_action() at .../qemu/blockdev.c:322: qemu-system-x86_64: -drive if=none,werror=foo: 'foo' invalid write error action Aborted (core dumped) Note: to get this example output, I monkey-patched drive_new() to pass &error_abort to blockdev_init(). To keep the error handling boiler plate from growing even more, all error_setFOO() become macros expanding into error_setFOO_internal() with additional __FILE__, __LINE__, __func__ arguments. Not exactly pretty, but it works. The macro trickery breaks down when you take the address of an error_setFOO(). Fortunately, we do that in just one place: qemu-ga's Windows VSS provider and requester DLL wants to call error_setg_win32() through a function pointer "to avoid linking glib to the DLL". Use error_setg_win32_internal() there. The use of the function pointer is already wrapped in a macro, so the churn isn't bad. Code size increases by some 35KiB for me (0.7%). Tolerable. Could be less if we passed relative rather than absolute source file names to the compiler, or forwent reporting __func__. Backports commit 1e9b65bb1bad51735cab6c861c29b592dccabf0e from qemu
158 lines
3.4 KiB
C
158 lines
3.4 KiB
C
/*
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* QEMU Error Objects
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2. See
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* the COPYING.LIB file in the top-level directory.
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*/
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#include "qemu-common.h"
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#include "qapi/error.h"
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struct Error
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{
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char *msg;
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ErrorClass err_class;
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const char *src, *func;
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int line;
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};
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Error *error_abort;
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static void error_do_abort(Error *err)
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{
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fprintf(stderr, "Unexpected error in %s() at %s:%d:\n",
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err->func, err->src, err->line);
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// UNICORN: Commented out
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// error_report_err(err);
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// abort();
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}
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static void error_setv(Error **errp,
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const char *src, int line, const char *func,
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ErrorClass err_class, const char *fmt, va_list ap)
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{
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Error *err;
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int saved_errno = errno;
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if (errp == NULL) {
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return;
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}
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assert(*errp == NULL);
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err = g_malloc0(sizeof(*err));
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err->msg = g_strdup_vprintf(fmt, ap);
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err->err_class = err_class;
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err->src = src;
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err->line = line;
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err->func = func;
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if (errp == &error_abort) {
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error_do_abort(err);
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}
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*errp = err;
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errno = saved_errno;
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}
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void error_set_internal(Error **errp,
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const char *src, int line, const char *func,
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ErrorClass err_class, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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error_setv(errp, src, line, func, err_class, fmt, ap);
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va_end(ap);
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}
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void error_setg_internal(Error **errp,
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const char *src, int line, const char *func,
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const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR, fmt, ap);
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va_end(ap);
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}
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void error_setg_errno_internal(Error **errp,
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const char *src, int line, const char *func,
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int os_errno, const char *fmt, ...)
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{
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va_list ap;
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char *msg;
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int saved_errno = errno;
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if (errp == NULL) {
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return;
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}
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va_start(ap, fmt);
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error_setv(errp, src, line, func, ERROR_CLASS_GENERIC_ERROR, fmt, ap);
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va_end(ap);
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if (os_errno != 0) {
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msg = (*errp)->msg;
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(*errp)->msg = g_strdup_printf("%s: %s", msg, strerror(os_errno));
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g_free(msg);
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}
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errno = saved_errno;
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}
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void error_setg_file_open_internal(Error **errp,
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const char *src, int line, const char *func,
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int os_errno, const char *filename)
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{
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error_setg_errno_internal(errp, src, line, func, os_errno,
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"Could not open '%s'", filename);
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}
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Error *error_copy(const Error *err)
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{
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Error *err_new;
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err_new = g_malloc0(sizeof(*err));
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err_new->msg = g_strdup(err->msg);
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err_new->err_class = err->err_class;
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return err_new;
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}
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ErrorClass error_get_class(const Error *err)
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{
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return err->err_class;
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}
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const char *error_get_pretty(Error *err)
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{
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return err->msg;
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}
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void error_free(Error *err)
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{
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if (err) {
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g_free(err->msg);
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g_free(err);
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}
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}
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void error_propagate(Error **dst_errp, Error *local_err)
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{
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if (local_err && dst_errp == &error_abort) {
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error_do_abort(local_err);
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} else if (dst_errp && !*dst_errp) {
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*dst_errp = local_err;
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} else if (local_err) {
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error_free(local_err);
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}
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}
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