The preprocessor currently accepts multiple else/elif-groups
per if-section. The GLSL-preprocessor is defined by the C++
specification, which defines the following parse-rule:
if-section:
if-group elif-groups(opt) else-group(opt) endif-line
This clearly only allows a single else-group, that has to come
after any elif-groups.
So let's modify the code to follow the specification. Add test
to prevent regressions.
---
Here's a resend of an older patch (original
<[email protected]>), this time
with a better commit message, and a similar treatment for elif-after-else.
src/glsl/glcpp/glcpp-parse.y | 23 +++++++++++++++++++++-
src/glsl/glcpp/glcpp.h | 1 +
src/glsl/glcpp/tests/118-multiple-else.c | 6 ++++++
src/glsl/glcpp/tests/118-multiple-else.c.expected | 8 ++++++++
src/glsl/glcpp/tests/119-elif-after-else.c | 6 ++++++
.../glcpp/tests/119-elif-after-else.c.expected | 8 ++++++++
6 files changed, 51 insertions(+), 1 deletion(-)
create mode 100644 src/glsl/glcpp/tests/118-multiple-else.c
create mode 100644 src/glsl/glcpp/tests/118-multiple-else.c.expected
create mode 100644 src/glsl/glcpp/tests/119-elif-after-else.c
create mode 100644 src/glsl/glcpp/tests/119-elif-after-else.c.expected
diff --git a/src/glsl/glcpp/glcpp-parse.y b/src/glsl/glcpp/glcpp-parse.y
index 7edc274..451b728 100644
--- a/src/glsl/glcpp/glcpp-parse.y
+++ b/src/glsl/glcpp/glcpp-parse.y
@@ -310,6 +310,11 @@ control_line:
_glcpp_parser_expand_and_lex_from (parser,
ELIF_EXPANDED, $2);
}
+ else if (parser->skip_stack &&
+ parser->skip_stack->has_else)
+ {
+ glcpp_error(& @1, parser, "#elif after #else");
+ }
else
{
_glcpp_parser_skip_stack_change_if (parser, & @1,
@@ -324,6 +329,11 @@ control_line:
{
glcpp_error(& @1, parser, "#elif with no expression");
}
+ else if (parser->skip_stack &&
+ parser->skip_stack->has_else)
+ {
+ glcpp_error(& @1, parser, "#elif after #else");
+ }
else
{
_glcpp_parser_skip_stack_change_if (parser, & @1,
@@ -332,7 +342,17 @@ control_line:
}
}
| HASH_ELSE {
- _glcpp_parser_skip_stack_change_if (parser, & @1, "else", 1);
+ if (parser->skip_stack &&
+ parser->skip_stack->has_else)
+ {
+ glcpp_error(& @1, parser, "multiple #else");
+ }
+ else
+ {
+ _glcpp_parser_skip_stack_change_if (parser, & @1,
"else", 1);
+ if (parser->skip_stack)
+ parser->skip_stack->has_else = true;
+ }
} NEWLINE
| HASH_ENDIF {
_glcpp_parser_skip_stack_pop (parser, & @1);
@@ -2024,6 +2044,7 @@ _glcpp_parser_skip_stack_push_if (glcpp_parser_t *parser,
YYLTYPE *loc,
node->type = SKIP_TO_ENDIF;
}
+ node->has_else = false;
node->next = parser->skip_stack;
parser->skip_stack = node;
}
diff --git a/src/glsl/glcpp/glcpp.h b/src/glsl/glcpp/glcpp.h
index 8aaa551..ccae96c 100644
--- a/src/glsl/glcpp/glcpp.h
+++ b/src/glsl/glcpp/glcpp.h
@@ -153,6 +153,7 @@ typedef enum skip_type {
typedef struct skip_node {
skip_type_t type;
+ bool has_else;
YYLTYPE loc; /* location of the initial #if/#elif/... */
struct skip_node *next;
} skip_node_t;
diff --git a/src/glsl/glcpp/tests/118-multiple-else.c
b/src/glsl/glcpp/tests/118-multiple-else.c
new file mode 100644
index 0000000..62ad49c
--- /dev/null
+++ b/src/glsl/glcpp/tests/118-multiple-else.c
@@ -0,0 +1,6 @@
+#if 0
+#else
+int foo;
+#else
+int bar;
+#endif
diff --git a/src/glsl/glcpp/tests/118-multiple-else.c.expected
b/src/glsl/glcpp/tests/118-multiple-else.c.expected
new file mode 100644
index 0000000..eaec481
--- /dev/null
+++ b/src/glsl/glcpp/tests/118-multiple-else.c.expected
@@ -0,0 +1,8 @@
+0:4(1): preprocessor error: multiple #else
+
+
+int foo;
+
+int bar;
+
+
diff --git a/src/glsl/glcpp/tests/119-elif-after-else.c
b/src/glsl/glcpp/tests/119-elif-after-else.c
new file mode 100644
index 0000000..9b9e923
--- /dev/null
+++ b/src/glsl/glcpp/tests/119-elif-after-else.c
@@ -0,0 +1,6 @@
+#if 0
+#else
+int foo;
+#elif 0
+int bar;
+#endif
diff --git a/src/glsl/glcpp/tests/119-elif-after-else.c.expected
b/src/glsl/glcpp/tests/119-elif-after-else.c.expected
new file mode 100644
index 0000000..33f0513
--- /dev/null
+++ b/src/glsl/glcpp/tests/119-elif-after-else.c.expected
@@ -0,0 +1,8 @@
+0:4(1): preprocessor error: #elif after #else
+
+
+int foo;
+
+int bar;
+
+
--
1.8.3.1
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