https://bugs.llvm.org/show_bug.cgi?id=44997
Bug ID: 44997
Summary: Parser crashes with invalid syntax
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: nicolas.alva...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
Created attachment 23163
--> https://bugs.llvm.org/attachment.cgi?id=23163&action=edit
Stack dump of crash
While reducing a test case with creduce, I ended up with a totally unrelated
crash than what I was looking for.
The following 9 tokens of invalid code abort the clang parser by executing an
llvm_unreachable statement:
class {
a(struct b
struct b ;
The newlines are apparently significant. Since it's an llvm_unreachable, you
need asserts enabled to reproduce.
Output:
$ clang++ -fsyntax-only viewmodeE.cpp
viewmodeE.cpp:2:14: error: expected ';' after struct
a(struct b
^
;
viewmodeE.cpp:3:3: error: expected ')'
struct b ;
^
viewmodeE.cpp:2:5: note: to match this '('
a(struct b
^
viewmodeE.cpp:2:4: error: C++ requires a type specifier for all declarations
a(struct b
^
viewmodeE.cpp:3:10: error: 'b' redeclared with 'private' access
struct b ;
^
Invalid access specifier!
UNREACHABLE executed at ../llvm/tools/clang/lib/AST/DeclCXX.cpp:3165!
I bisected the crash back to this commit from 2016(!):
https://github.com/llvm/llvm-project/commit/078aea904331271c3fdc65b52d128a8acefe4e38
Full stack trace attached.
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