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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 11/28] libxl: ocaml: propagate the libxl return error code in exceptions
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Signed-off-by: Rob Hoes <rob.hoes@xxxxxxxxxx>
---
New in v3:
* Now using the auto-generated error type.
---
tools/ocaml/libs/xl/genwrap.py | 10 +++----
tools/ocaml/libs/xl/xenlight.ml.in | 10 +++++--
tools/ocaml/libs/xl/xenlight.mli.in | 9 ++++--
tools/ocaml/libs/xl/xenlight_stubs.c | 50 ++++++++++++++++++++++++----------
4 files changed, 55 insertions(+), 24 deletions(-)
diff --git a/tools/ocaml/libs/xl/genwrap.py b/tools/ocaml/libs/xl/genwrap.py
index d8d675c..611d892 100644
--- a/tools/ocaml/libs/xl/genwrap.py
+++ b/tools/ocaml/libs/xl/genwrap.py
@@ -235,7 +235,7 @@ def c_val(ty, c, o, indent="", parent = None):
for e in ty.values:
s += " case %d: *%s = %s; break;\n" % (n, c, e.name)
n += 1
- s += " default: failwith_xl(\"cannot convert value to %s\");
break;\n" % ty.typename
+ s += " default: failwith_xl(ERROR_FAIL, \"cannot convert value to
%s\"); break;\n" % ty.typename
s += "}"
elif isinstance(ty, idl.KeyedUnion):
s += "{\n"
@@ -248,7 +248,7 @@ def c_val(ty, c, o, indent="", parent = None):
parent + ty.keyvar.name,
f.enumname)
n += 1
- s += "\t\t default: failwith_xl(\"variant handling bug %s%s
(long)\"); break;\n" % (parent, ty.keyvar.name)
+ s += "\t\t default: failwith_xl(ERROR_FAIL, \"variant handling bug
%s%s (long)\"); break;\n" % (parent, ty.keyvar.name)
s += "\t\t}\n"
s += "\t} else {\n"
s += "\t\t/* Is block... */\n"
@@ -264,7 +264,7 @@ def c_val(ty, c, o, indent="", parent = None):
s += "%s" % c_val(f.type, fexpr, "Field(%s, 0)" % o,
indent=indent+"\t\t ")
s += "break;\n"
n += 1
- s += "\t\t default: failwith_xl(\"variant handling bug %s%s
(block)\"); break;\n" % (parent, ty.keyvar.name)
+ s += "\t\t default: failwith_xl(ERROR_FAIL, \"variant handling bug
%s%s (block)\"); break;\n" % (parent, ty.keyvar.name)
s += "\t\t}\n"
s += "\t}\n"
s += "}"
@@ -333,7 +333,7 @@ def ocaml_Val(ty, o, c, indent="", parent = None):
for e in ty.values:
s += " case %s: %s = Int_val(%d); break;\n" % (e.name, o, n)
n += 1
- s += " default: failwith_xl(\"cannot convert value from %s\");
break;\n" % ty.typename
+ s += " default: failwith_xl(ERROR_FAIL, \"cannot convert value from
%s\"); break;\n" % ty.typename
s += "}"
elif isinstance(ty, idl.KeyedUnion):
n = 0
@@ -362,7 +362,7 @@ def ocaml_Val(ty, o, c, indent="", parent = None):
m += 1
#s += "\t %s = caml_alloc(%d,%d);\n" %
(o,len(f.type.fields),n)
s += "\t break;\n"
- s += "\t default: failwith_xl(\"cannot convert value from %s\");
break;\n" % ty.typename
+ s += "\t default: failwith_xl(ERROR_FAIL, \"cannot convert value
from %s\"); break;\n" % ty.typename
s += "\t}"
elif isinstance(ty,idl.Aggregate) and (parent is None or ty.rawname is
None):
s += "{\n"
diff --git a/tools/ocaml/libs/xl/xenlight.ml.in
b/tools/ocaml/libs/xl/xenlight.ml.in
index dffba72..a281425 100644
--- a/tools/ocaml/libs/xl/xenlight.ml.in
+++ b/tools/ocaml/libs/xl/xenlight.ml.in
@@ -13,18 +13,22 @@
* GNU Lesser General Public License for more details.
*)
-exception Error of string
-
type ctx
type domid = int
type devid = int
(* @@LIBXL_TYPES@@ *)
+exception Error of (error * string)
+
external ctx_alloc: Xentoollog.handle -> ctx = "stub_libxl_ctx_alloc"
+external test_raise_exception: unit -> unit = "stub_raise_exception"
+
external send_trigger : ctx -> domid -> trigger -> int -> unit =
"stub_xl_send_trigger"
external send_sysrq : ctx -> domid -> char -> unit = "stub_xl_send_sysrq"
external send_debug_keys : ctx -> string -> unit = "stub_xl_send_debug_keys"
-let _ = Callback.register_exception "Xenlight.Error" (Error(""))
+let register_exceptions () =
+ Callback.register_exception "Xenlight.Error" (Error(ERROR_FAIL, ""))
+
diff --git a/tools/ocaml/libs/xl/xenlight.mli.in
b/tools/ocaml/libs/xl/xenlight.mli.in
index e2686bb..d663196 100644
--- a/tools/ocaml/libs/xl/xenlight.mli.in
+++ b/tools/ocaml/libs/xl/xenlight.mli.in
@@ -13,16 +13,21 @@
* GNU Lesser General Public License for more details.
*)
-exception Error of string
-
type ctx
type domid = int
type devid = int
(* @@LIBXL_TYPES@@ *)
+exception Error of (error * string)
+
+val register_exceptions: unit -> unit
+
external ctx_alloc: Xentoollog.handle -> ctx = "stub_libxl_ctx_alloc"
+external test_raise_exception: unit -> unit = "stub_raise_exception"
+
external send_trigger : ctx -> domid -> trigger -> int -> unit =
"stub_xl_send_trigger"
external send_sysrq : ctx -> domid -> char -> unit = "stub_xl_send_sysrq"
external send_debug_keys : ctx -> string -> unit = "stub_xl_send_debug_keys"
+
diff --git a/tools/ocaml/libs/xl/xenlight_stubs.c
b/tools/ocaml/libs/xl/xenlight_stubs.c
index dd6c781..a6f6e6f 100644
--- a/tools/ocaml/libs/xl/xenlight_stubs.c
+++ b/tools/ocaml/libs/xl/xenlight_stubs.c
@@ -47,12 +47,34 @@ static char * dup_String_val(value s)
return c;
}
-static void failwith_xl(char *fname)
+/* Forward reference: this is defined in the auto-generated include file
below. */
+static value Val_error (error error_c);
+
+static void failwith_xl(int error, char *fname)
{
- value *exc = caml_named_value("Xenlight.Error");
+ CAMLlocal1(arg);
+ static value *exc = NULL;
+
+ /* First time around, lookup by name */
+ if (!exc)
+ exc = caml_named_value("Xenlight.Error");
+
if (!exc)
- caml_invalid_argument("Exception Xenlight.Error not
initialized, please link xl.cma");
- caml_raise_with_string(*exc, fname);
+ caml_invalid_argument("Exception Xenlight.Error not
initialized, please link xenlight.cma");
+
+ arg = caml_alloc(2, 0);
+
+ Store_field(arg, 0, Val_error(error));
+ Store_field(arg, 1, caml_copy_string(fname));
+
+ caml_raise_with_arg(*exc, arg);
+}
+
+CAMLprim value stub_raise_exception(value unit)
+{
+ CAMLparam1(unit);
+ failwith_xl(ERROR_FAIL, "test exception");
+ CAMLreturn(Val_unit);
}
void ctx_finalize(value ctx)
@@ -78,7 +100,7 @@ CAMLprim value stub_libxl_ctx_alloc(value logger)
ret = libxl_ctx_alloc(&ctx, LIBXL_VERSION, 0, (xentoollog_logger *)
Xtl_val(logger));
if (ret != 0) \
- failwith_xl("cannot init context");
+ failwith_xl(ERROR_FAIL, "cannot init context");
handle = caml_alloc_custom(&libxl_ctx_custom_operations, sizeof(ctx),
0, 1);
Ctx_val(handle) = ctx;
@@ -246,7 +268,7 @@ static int Bitmap_val(libxl_ctx *ctx, libxl_bitmap *c_val,
value v)
c_val->size = 0;
if (len > 0 && libxl_bitmap_alloc(ctx, c_val, len))
- failwith_xl("cannot allocate bitmap");
+ failwith_xl(ERROR_NOMEM, "cannot allocate bitmap");
for (i=0; i<len; i++) {
if (Int_val(Field(v, i)))
libxl_bitmap_set(c_val, i);
@@ -342,7 +364,7 @@ value stub_xl_device_##type##_##op(value ctx, value info,
value domid) \
libxl_device_##type##_dispose(&c_info); \
\
if (ret != 0) \
- failwith_xl(STRINGIFY(type) "_" STRINGIFY(op)); \
+ failwith_xl(ret, STRINGIFY(type) "_" STRINGIFY(op)); \
\
CAMLreturn(Val_unit); \
}
@@ -368,7 +390,7 @@ value stub_xl_physinfo_get(value ctx)
ret = libxl_get_physinfo(CTX, &c_physinfo);
if (ret != 0)
- failwith_xl("get_physinfo");
+ failwith_xl(ret, "get_physinfo");
physinfo = Val_physinfo(&c_physinfo);
@@ -387,7 +409,7 @@ value stub_xl_cputopology_get(value ctx)
c_topology = libxl_get_cpu_topology(CTX, &nr);
if (!c_topology)
- failwith_xl("topologyinfo");
+ failwith_xl(ERROR_FAIL, "get_cpu_topologyinfo");
topology = caml_alloc_tuple(nr);
for (i = 0; i < nr; i++) {
@@ -414,7 +436,7 @@ value stub_xl_domain_sched_params_get(value ctx, value
domid)
ret = libxl_domain_sched_params_get(CTX, Int_val(domid), &c_scinfo);
if (ret != 0)
- failwith_xl("domain_sched_params_get");
+ failwith_xl(ret, "domain_sched_params_get");
scinfo = Val_domain_sched_params(&c_scinfo);
@@ -436,7 +458,7 @@ value stub_xl_domain_sched_params_set(value ctx, value
domid, value scinfo)
libxl_domain_sched_params_dispose(&c_scinfo);
if (ret != 0)
- failwith_xl("domain_sched_params_set");
+ failwith_xl(ret, "domain_sched_params_set");
CAMLreturn(Val_unit);
}
@@ -453,7 +475,7 @@ value stub_xl_send_trigger(value ctx, value domid, value
trigger, value vcpuid)
c_trigger, Int_val(vcpuid));
if (ret != 0)
- failwith_xl("send_trigger");
+ failwith_xl(ret, "send_trigger");
CAMLreturn(Val_unit);
}
@@ -466,7 +488,7 @@ value stub_xl_send_sysrq(value ctx, value domid, value
sysrq)
ret = libxl_send_sysrq(CTX, Int_val(domid), Int_val(sysrq));
if (ret != 0)
- failwith_xl("send_sysrq");
+ failwith_xl(ret, "send_sysrq");
CAMLreturn(Val_unit);
}
@@ -481,7 +503,7 @@ value stub_xl_send_debug_keys(value ctx, value keys)
ret = libxl_send_debug_keys(CTX, c_keys);
if (ret != 0)
- failwith_xl("send_debug_keys");
+ failwith_xl(ret, "send_debug_keys");
free(c_keys);
--
1.7.10.4
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