qapi script: do not add "_" for every capitalized char in enum

Now "enum AIOContext" will generate AIO_CONTEXT instead of A_I_O_CONTEXT,
"X86CPU" will generate X86_CPU instead of X86_C_P_U.

Signed-off-by: Wenchao Xia <wenchaoqemu@gmail.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

include/qapi/qmp/qerror.h

@@ -159,7 +159,7 @@ void qerror_report_err(Error *err);
     ERROR_CLASS_GENERIC_ERROR, "Invalid JSON syntax"
 
 #define QERR_KVM_MISSING_CAP \
-    ERROR_CLASS_K_V_M_MISSING_CAP, "Using KVM without %s, %s unavailable"
+    ERROR_CLASS_KVM_MISSING_CAP, "Using KVM without %s, %s unavailable"
 
 #define QERR_MIGRATION_ACTIVE \
     ERROR_CLASS_GENERIC_ERROR, "There's a migration process in progress"

scripts/qapi.py

@@ -498,17 +498,29 @@ def guardend(name):
 ''',
                  name=guardname(name))
 
-def _generate_enum_value_string(value):
+# ENUMName -> ENUM_NAME, EnumName1 -> ENUM_NAME1
+# ENUM_NAME -> ENUM_NAME, ENUM_NAME1 -> ENUM_NAME1, ENUM_Name2 -> ENUM_NAME2
+# ENUM24_Name -> ENUM24_NAME
+def _generate_enum_string(value):
+    c_fun_str = c_fun(value, False)
     if value.isupper():
-        return c_fun(value, False)
+        return c_fun_str
+
     new_name = ''
-    for c in c_fun(value, False):
-        if c.isupper():
-            new_name += '_'
+    l = len(c_fun_str)
+    for i in range(l):
+        c = c_fun_str[i]
+        # When c is upper and no "_" appears before, do more checks
+        if c.isupper() and (i > 0) and c_fun_str[i - 1] != "_":
+            # Case 1: next string is lower
+            # Case 2: previous string is digit
+            if (i < (l - 1) and c_fun_str[i + 1].islower()) or \
+            c_fun_str[i - 1].isdigit():
+                new_name += '_'
         new_name += c
     return new_name.lstrip('_').upper()
 
 def generate_enum_full_value(enum_name, enum_value):
-    abbrev_string = de_camel_case(enum_name).upper()
-    value_string = _generate_enum_value_string(enum_value)
+    abbrev_string = _generate_enum_string(enum_name)
+    value_string = _generate_enum_string(enum_value)
     return "%s_%s" % (abbrev_string, value_string)

target-i386/cpu.c

@@ -315,7 +315,7 @@ typedef struct X86RegisterInfo32 {
 } X86RegisterInfo32;
 
 #define REGISTER(reg) \
-    [R_##reg] = { .name = #reg, .qapi_enum = X86_C_P_U_REGISTER32_##reg }
+    [R_##reg] = { .name = #reg, .qapi_enum = X86_CPU_REGISTER32_##reg }
 X86RegisterInfo32 x86_reg_info_32[CPU_NB_REGS32] = {
     REGISTER(EAX),
     REGISTER(ECX),