http://llvm.org/bugs/show_bug.cgi?id=15927
Bug ID: 15927
Summary: YAML IO crashes in Input::beginMapping() when trying
to read from an empty string
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The code to reproduce this is:
#include "llvm/Support/YAMLTraits.h"
struct T { int a; };
namespace llvm {
namespace yaml {
template <> struct MappingTraits<T> {
static void mapping(llvm::yaml::IO &IO, T &T) {
IO.mapOptional("a", T.a);
}
};
}
}
int main(int argc, const char **argv) {
llvm::yaml::Input Input("");
T T;
Input >> T;
return 0;
}
-----------------
$ ./test
test: llvm/include/llvm/Support/Casting.h:97: static bool
llvm::isa_impl_cl<llvm::yaml::Input::MapHNode, const llvm::yaml::Input::HNode
*>::doit(const From *) [To = llvm::yaml::Input::MapHNode, From = const
llvm::yaml::Input::HNode *]: Assertion `Val && "isa<> used on a null pointer"'
failed.
Aborted (core dumped)
The problem is in the line 88 of lib/Support/YAMLTraits.cpp:
88 MapHNode *MN = dyn_cast<MapHNode>(CurrentNode);
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