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[Qemu-devel] [PATCH PULL v2 01/11] qapi: allow override of default enum
From: |
Daniel P. Berrange |
Subject: |
[Qemu-devel] [PATCH PULL v2 01/11] qapi: allow override of default enum prefix naming |
Date: |
Tue, 15 Sep 2015 11:16:57 +0100 |
The camel_to_upper() method applies some heuristics to turn
a mixed case type name into an all-uppercase name. This is
used for example, to generate enum constant name prefixes.
The heuristics don't also generate a satisfactory name
though. eg
{ 'enum': 'QCryptoTLSCredsEndpoint',
'data': ['client', 'server']}
Results in Q_CRYPTOTLS_CREDS_ENDPOINT_CLIENT. This has
an undesirable _ after the initial Q and is missing an
_ between the CRYPTO & TLS strings.
Rather than try to add more and more heuristics to try
to cope with this, simply allow the QAPI schema to
specify the desired enum constant prefix explicitly.
eg
{ 'enum': 'QCryptoTLSCredsEndpoint',
'prefix': 'QCRYPTO_TLS_CREDS_ENDPOINT',
'data': ['client', 'server']}
Now gives the QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT name.
Signed-off-by: Daniel P. Berrange <address@hidden>
---
docs/qapi-code-gen.txt | 8 ++++++++
scripts/qapi-types.py | 16 +++++++++-------
scripts/qapi.py | 10 ++++++++--
tests/Makefile | 3 ++-
tests/qapi-schema/enum-bad-prefix.err | 1 +
tests/qapi-schema/enum-bad-prefix.exit | 1 +
tests/qapi-schema/enum-bad-prefix.json | 2 ++
tests/qapi-schema/enum-bad-prefix.out | 0
tests/qapi-schema/qapi-schema-test.json | 5 +++++
tests/qapi-schema/qapi-schema-test.out | 2 ++
10 files changed, 38 insertions(+), 10 deletions(-)
create mode 100644 tests/qapi-schema/enum-bad-prefix.err
create mode 100644 tests/qapi-schema/enum-bad-prefix.exit
create mode 100644 tests/qapi-schema/enum-bad-prefix.json
create mode 100644 tests/qapi-schema/enum-bad-prefix.out
diff --git a/docs/qapi-code-gen.txt b/docs/qapi-code-gen.txt
index ff16df2..d960dc0 100644
--- a/docs/qapi-code-gen.txt
+++ b/docs/qapi-code-gen.txt
@@ -236,6 +236,7 @@ both fields like this:
=== Enumeration types ===
Usage: { 'enum': STRING, 'data': ARRAY-OF-STRING }
+ { 'enum': STRING, '*prefix': STRING, 'data': ARRAY-OF-STRING }
An enumeration type is a dictionary containing a single 'data' key
whose value is a list of strings. An example enumeration is:
@@ -247,6 +248,13 @@ useful. The list of strings should be lower case; if an
enum name
represents multiple words, use '-' between words. The string 'max' is
not allowed as an enum value, and values should not be repeated.
+The enum constants will be named by using a heuristic to turn the
+type name into a set of underscore separated words. For the example
+above, 'MyEnum' will turn into 'MY_ENUM' giving a constant name
+of 'MY_ENUM_VALUE1' for the first value. If the default heuristic
+does not result in a desirable name, the optional 'prefix' field
+can be used when defining the enum.
+
The enumeration values are passed as strings over the Client JSON
Protocol, but are encoded as C enum integral values in generated code.
While the C code starts numbering at 0, it is better to use explicit
diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py
index f2428f3..a8453d1 100644
--- a/scripts/qapi-types.py
+++ b/scripts/qapi-types.py
@@ -101,20 +101,20 @@ struct %(name)s {
return ret
-def generate_enum_lookup(name, values):
+def generate_enum_lookup(name, values, prefix=None):
ret = mcgen('''
const char *const %(name)s_lookup[] = {
''',
name=c_name(name))
for value in values:
- index = c_enum_const(name, value)
+ index = c_enum_const(name, value, prefix)
ret += mcgen('''
[%(index)s] = "%(value)s",
''',
index = index, value = value)
- max_index = c_enum_const(name, 'MAX')
+ max_index = c_enum_const(name, 'MAX', prefix)
ret += mcgen('''
[%(max_index)s] = NULL,
};
@@ -122,7 +122,7 @@ const char *const %(name)s_lookup[] = {
max_index=max_index)
return ret
-def generate_enum(name, values):
+def generate_enum(name, values, prefix=None):
name = c_name(name)
lookup_decl = mcgen('''
@@ -141,7 +141,7 @@ typedef enum %(name)s {
i = 0
for value in enum_values:
- enum_full_value = c_enum_const(name, value)
+ enum_full_value = c_enum_const(name, value, prefix)
enum_decl += mcgen('''
%(enum_full_value)s = %(i)d,
''',
@@ -348,9 +348,11 @@ for expr in exprs:
if expr.has_key('struct'):
ret += generate_fwd_struct(expr['struct'])
elif expr.has_key('enum'):
- ret += generate_enum(expr['enum'], expr['data'])
+ ret += generate_enum(expr['enum'], expr['data'],
+ expr.get('prefix'))
ret += generate_fwd_enum_struct(expr['enum'])
- fdef.write(generate_enum_lookup(expr['enum'], expr['data']))
+ fdef.write(generate_enum_lookup(expr['enum'], expr['data'],
+ expr.get('prefix')))
elif expr.has_key('union'):
ret += generate_fwd_struct(expr['union'])
enum_define = discriminator_find_enum_define(expr)
diff --git a/scripts/qapi.py b/scripts/qapi.py
index 88fa073..c4423b7 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -634,11 +634,15 @@ def check_alternate(expr, expr_info):
def check_enum(expr, expr_info):
name = expr['enum']
members = expr.get('data')
+ prefix = expr.get('prefix')
values = { 'MAX': '(automatic)' }
if not isinstance(members, list):
raise QAPIExprError(expr_info,
"Enum '%s' requires an array for 'data'" % name)
+ if prefix is not None and not isinstance(prefix, str):
+ raise QAPIExprError(expr_info,
+ "Enum '%s' requires a string for 'prefix'" % name)
for member in members:
check_name(expr_info, "Member of enum '%s'" %name, member,
enum_member=True)
@@ -693,7 +697,7 @@ def check_exprs(exprs):
expr = expr_elem['expr']
info = expr_elem['info']
if expr.has_key('enum'):
- check_keys(expr_elem, 'enum', ['data'])
+ check_keys(expr_elem, 'enum', ['data'], ['prefix'])
add_enum(expr['enum'], info, expr['data'])
elif expr.has_key('union'):
check_keys(expr_elem, 'union', ['data'],
@@ -813,7 +817,9 @@ def camel_to_upper(value):
new_name += c
return new_name.lstrip('_').upper()
-def c_enum_const(type_name, const_name):
+def c_enum_const(type_name, const_name, prefix=None):
+ if prefix is not None:
+ type_name = prefix
return camel_to_upper(type_name + '_' + const_name)
c_name_trans = string.maketrans('.-', '__')
diff --git a/tests/Makefile b/tests/Makefile
index 34c6136..1951b1d 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -221,7 +221,8 @@ check-qapi-schema-y := $(addprefix tests/qapi-schema/, \
comments.json empty.json enum-empty.json enum-missing-data.json \
enum-wrong-data.json enum-int-member.json enum-dict-member.json \
enum-clash-member.json enum-max-member.json enum-union-clash.json \
- enum-bad-name.json funny-char.json indented-expr.json \
+ enum-bad-name.json enum-bad-prefix.json \
+ funny-char.json indented-expr.json \
missing-type.json bad-ident.json ident-with-escape.json \
escape-outside-string.json unknown-escape.json \
escape-too-short.json escape-too-big.json unicode-str.json \
diff --git a/tests/qapi-schema/enum-bad-prefix.err
b/tests/qapi-schema/enum-bad-prefix.err
new file mode 100644
index 0000000..399f5f7
--- /dev/null
+++ b/tests/qapi-schema/enum-bad-prefix.err
@@ -0,0 +1 @@
+tests/qapi-schema/enum-bad-prefix.json:2: Enum 'MyEnum' requires a string for
'prefix'
diff --git a/tests/qapi-schema/enum-bad-prefix.exit
b/tests/qapi-schema/enum-bad-prefix.exit
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/tests/qapi-schema/enum-bad-prefix.exit
@@ -0,0 +1 @@
+1
diff --git a/tests/qapi-schema/enum-bad-prefix.json
b/tests/qapi-schema/enum-bad-prefix.json
new file mode 100644
index 0000000..996f628
--- /dev/null
+++ b/tests/qapi-schema/enum-bad-prefix.json
@@ -0,0 +1,2 @@
+# The prefix must be a string type
+{ 'enum': 'MyEnum', 'data': [ 'one' ], 'prefix': [ 'fish' ] }
diff --git a/tests/qapi-schema/enum-bad-prefix.out
b/tests/qapi-schema/enum-bad-prefix.out
new file mode 100644
index 0000000..e69de29
diff --git a/tests/qapi-schema/qapi-schema-test.json
b/tests/qapi-schema/qapi-schema-test.json
index a9e5aab..677190c 100644
--- a/tests/qapi-schema/qapi-schema-test.json
+++ b/tests/qapi-schema/qapi-schema-test.json
@@ -6,6 +6,11 @@
{ 'struct': 'NestedEnumsOne',
'data': { 'enum1': 'EnumOne', '*enum2': 'EnumOne', 'enum3': 'EnumOne',
'*enum4': 'EnumOne' } }
+# for testing override of default naming heuristic
+{ 'enum': 'QEnumTwo',
+ 'prefix': 'QENUM_TWO',
+ 'data': [ 'value1', 'value2' ] }
+
# for testing nested structs
{ 'struct': 'UserDefOne',
'base': 'UserDefZero', # intentional forward reference
diff --git a/tests/qapi-schema/qapi-schema-test.out
b/tests/qapi-schema/qapi-schema-test.out
index b0b7187..32f17c5 100644
--- a/tests/qapi-schema/qapi-schema-test.out
+++ b/tests/qapi-schema/qapi-schema-test.out
@@ -1,5 +1,6 @@
[OrderedDict([('enum', 'EnumOne'), ('data', ['value1', 'value2', 'value3'])]),
OrderedDict([('struct', 'NestedEnumsOne'), ('data', OrderedDict([('enum1',
'EnumOne'), ('*enum2', 'EnumOne'), ('enum3', 'EnumOne'), ('*enum4',
'EnumOne')]))]),
+ OrderedDict([('enum', 'QEnumTwo'), ('prefix', 'QENUM_TWO'), ('data',
['value1', 'value2'])]),
OrderedDict([('struct', 'UserDefOne'), ('base', 'UserDefZero'), ('data',
OrderedDict([('string', 'str'), ('*enum1', 'EnumOne')]))]),
OrderedDict([('struct', 'UserDefZero'), ('data', OrderedDict([('integer',
'int')]))]),
OrderedDict([('struct', 'UserDefTwoDictDict'), ('data',
OrderedDict([('userdef', 'UserDefOne'), ('string', 'str')]))]),
@@ -33,6 +34,7 @@
OrderedDict([('event', '__ORG.QEMU_X-EVENT'), ('data',
'__org.qemu_x-Struct')]),
OrderedDict([('command', '__org.qemu_x-command'), ('data', OrderedDict([('a',
['__org.qemu_x-Enum']), ('b', ['__org.qemu_x-Struct']), ('c',
'__org.qemu_x-Union2'), ('d', '__org.qemu_x-Alt')])), ('returns',
'__org.qemu_x-Union1')])]
[{'enum_name': 'EnumOne', 'enum_values': ['value1', 'value2', 'value3']},
+ {'enum_name': 'QEnumTwo', 'enum_values': ['value1', 'value2']},
{'enum_name': '__org.qemu_x-Enum', 'enum_values': ['__org.qemu_x-value']},
{'enum_name': 'UserDefAlternateKind', 'enum_values': None},
{'enum_name': 'UserDefNativeListUnionKind', 'enum_values': None},
--
2.4.3
- [Qemu-devel] [PATCH PULL v2 00/11] Extract TLS handling code from VNC server, Daniel P. Berrange, 2015/09/15
- [Qemu-devel] [PATCH PULL v2 04/11] qom: allow QOM to be linked into tools binaries, Daniel P. Berrange, 2015/09/15
- [Qemu-devel] [PATCH PULL v2 02/11] tests: remove repetition in unit test object deps, Daniel P. Berrange, 2015/09/15
- [Qemu-devel] [PATCH PULL v2 01/11] qapi: allow override of default enum prefix naming,
Daniel P. Berrange <=
- [Qemu-devel] [PATCH PULL v2 05/11] crypto: introduce new base module for TLS credentials, Daniel P. Berrange, 2015/09/15
- [Qemu-devel] [PATCH PULL v2 03/11] crypto: move crypto objects out of libqemuutil.la, Daniel P. Berrange, 2015/09/15
- [Qemu-devel] [PATCH PULL v2 06/11] crypto: introduce new module for TLS anonymous credentials, Daniel P. Berrange, 2015/09/15
- [Qemu-devel] [PATCH PULL v2 07/11] crypto: introduce new module for TLS x509 credentials, Daniel P. Berrange, 2015/09/15
- [Qemu-devel] [PATCH PULL v2 10/11] ui: fix return type for VNC I/O functions to be ssize_t, Daniel P. Berrange, 2015/09/15
- [Qemu-devel] [PATCH PULL v2 09/11] crypto: introduce new module for handling TLS sessions, Daniel P. Berrange, 2015/09/15
- [Qemu-devel] [PATCH PULL v2 08/11] crypto: add sanity checking of TLS x509 credentials, Daniel P. Berrange, 2015/09/15
- [Qemu-devel] [PATCH PULL v2 11/11] ui: convert VNC server to use QCryptoTLSSession, Daniel P. Berrange, 2015/09/15
- Re: [Qemu-devel] [PATCH PULL v2 00/11] Extract TLS handling code from VNC server, Peter Maydell, 2015/09/15