[Qemu-devel] [PATCH V9 02/10] qapi script: add check for duplicated key

[Wenchao Xia <wenchaoqemu@gmail.com>]

It is bad that same key was specified twice, especially when a union has
two branches with same condition. This patch can prevent it.

Signed-off-by: Wenchao Xia <wenchaoqemu@gmail.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 scripts/qapi.py                      |    2 ++
 tests/Makefile                       |    3 ++-
 tests/qapi-schema/duplicate-key.err  |    1 +
 tests/qapi-schema/duplicate-key.exit |    1 +
 tests/qapi-schema/duplicate-key.json |    2 ++
 5 files changed, 8 insertions(+), 1 deletions(-)
 create mode 100644 tests/qapi-schema/duplicate-key.err
 create mode 100644 tests/qapi-schema/duplicate-key.exit
 create mode 100644 tests/qapi-schema/duplicate-key.json
 create mode 100644 tests/qapi-schema/duplicate-key.out

diff --git a/scripts/qapi.py b/scripts/qapi.py
index 023930e..d0e7934 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -116,6 +116,8 @@ class QAPISchema:
             if self.tok != ':':
                 raise QAPISchemaError(self, 'Expected ":"')
             self.accept()
+            if key in expr:
+                raise QAPISchemaError(self, 'Duplicate key "%s"' % key)
             expr[key] = self.get_expr(True)
             if self.tok == '}':
                 self.accept()
diff --git a/tests/Makefile b/tests/Makefile
index b17d41e..dfe06eb 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -142,7 +142,8 @@ check-qapi-schema-y := $(addprefix tests/qapi-schema/, \
         missing-comma-object.json non-objects.json \
         qapi-schema-test.json quoted-structural-chars.json \
         trailing-comma-list.json trailing-comma-object.json \
-        unclosed-list.json unclosed-object.json unclosed-string.json)
+        unclosed-list.json unclosed-object.json unclosed-string.json \
+        duplicate-key.json)
 
 GENERATED_HEADERS += tests/test-qapi-types.h tests/test-qapi-visit.h tests/test-qmp-commands.h
 
diff --git a/tests/qapi-schema/duplicate-key.err b/tests/qapi-schema/duplicate-key.err
new file mode 100644
index 0000000..0801c6a
--- /dev/null
+++ b/tests/qapi-schema/duplicate-key.err
@@ -0,0 +1 @@
+<stdin>:2:10: Duplicate key "key"
diff --git a/tests/qapi-schema/duplicate-key.exit b/tests/qapi-schema/duplicate-key.exit
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/tests/qapi-schema/duplicate-key.exit
@@ -0,0 +1 @@
+1
diff --git a/tests/qapi-schema/duplicate-key.json b/tests/qapi-schema/duplicate-key.json
new file mode 100644
index 0000000..1b55d88
--- /dev/null
+++ b/tests/qapi-schema/duplicate-key.json
@@ -0,0 +1,2 @@
+{ 'key': 'value',
+  'key': 'value' }
diff --git a/tests/qapi-schema/duplicate-key.out b/tests/qapi-schema/duplicate-key.out
new file mode 100644
index 0000000..e69de29
-- 
1.7.1