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author | Reid Kleckner <rnk@google.com> | 2016-12-09 17:14:05 +0000 |
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committer | Reid Kleckner <rnk@google.com> | 2016-12-09 17:14:05 +0000 |
commit | 3a67a19e28fc3380fb836a5ff9a33a55cf197547 (patch) | |
tree | 8954b85fc3617925f8a70e846bc3542e3c5b8780 /lib/Parse/ParseExpr.cpp | |
parent | 153c995100ac3869ce54e68baa8ece8f97270ea4 (diff) | |
download | clang-3a67a19e28fc3380fb836a5ff9a33a55cf197547.tar.gz |
Store decls in prototypes on the declarator instead of in the AST
This saves two pointers from FunctionDecl that were being used for some
rare and questionable C-only functionality. The DeclsInPrototypeScope
ArrayRef was added in r151712 in order to parse this kind of C code:
enum e {x, y};
int f(enum {y, x} n) {
return x; // should return 1, not 0
}
The challenge is that we parse 'int f(enum {y, x} n)' it its own
function prototype scope that gets popped before we build the
FunctionDecl for 'f'. The original change was doing two questionable
things:
1. Saving all tag decls introduced in prototype scope on a TU-global
Sema variable. This is problematic when you have cases like this, where
'x' and 'y' shouldn't be visible in 'f':
void f(void (*fp)(enum { x, y } e)) { /* no x */ }
This patch fixes that, so now 'f' can't see 'x', which is consistent
with GCC.
2. Storing the decls in FunctionDecl in ActOnFunctionDeclarator so that
they could be used in ActOnStartOfFunctionDef. This is just an
inefficient way to move information around. The AST lives forever, but
the list of non-parameter decls in prototype scope is short lived.
Moving these things to the Declarator solves both of these issues.
Reviewers: rsmith
Subscribers: jmolloy, cfe-commits
Differential Revision: https://reviews.llvm.org/D27279
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@289225 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Parse/ParseExpr.cpp')
-rw-r--r-- | lib/Parse/ParseExpr.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp index 4b0a83446e..caf2320f8f 100644 --- a/lib/Parse/ParseExpr.cpp +++ b/lib/Parse/ParseExpr.cpp @@ -2842,6 +2842,7 @@ ExprResult Parser::ParseBlockLiteralExpression() { /*NumExceptions=*/0, /*NoexceptExpr=*/nullptr, /*ExceptionSpecTokens=*/nullptr, + /*DeclsInPrototype=*/None, CaretLoc, CaretLoc, ParamInfo), attrs, CaretLoc); |