[llvm] r232833 - DebugInfoFinder: Check for null imported entities
David Blaikie
dblaikie at gmail.com
Fri Mar 20 12:55:55 PDT 2015
On Fri, Mar 20, 2015 at 12:13 PM, Duncan P. N. Exon Smith <
dexonsmith at apple.com> wrote:
> Author: dexonsmith
> Date: Fri Mar 20 14:13:53 2015
> New Revision: 232833
>
> URL: http://llvm.org/viewvc/llvm-project?rev=232833&view=rev
> Log:
> DebugInfoFinder: Check for null imported entities
>
When do we have null imported entities? Can we just disallow them?
There used to be a lot of conditionals for null DI* across the debug info
handling and in many cases it hid bugs - I've removed any & would like it
if we could continue pushing in that direction, rather than going back to
the way things were.
>
> Don't use the accessors in `DIImportedEntity` on a null pointer. (A WIP
> patch to make `DIDescriptor` accessors more strict crashes here
> otherwise.)
>
> Modified:
> llvm/trunk/lib/IR/DebugInfo.cpp
>
> Modified: llvm/trunk/lib/IR/DebugInfo.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/IR/DebugInfo.cpp?rev=232833&r1=232832&r2=232833&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/IR/DebugInfo.cpp (original)
> +++ llvm/trunk/lib/IR/DebugInfo.cpp Fri Mar 20 14:13:53 2015
> @@ -674,6 +674,8 @@ void DebugInfoFinder::processModule(cons
> DIArray Imports = CU.getImportedEntities();
> for (unsigned i = 0, e = Imports.getNumElements(); i != e; ++i) {
> DIImportedEntity Import = DIImportedEntity(Imports.getElement(i));
> + if (!Import)
> + continue;
> DIDescriptor Entity =
> Import.getEntity().resolve(TypeIdentifierMap);
> if (Entity.isType())
> processType(DIType(Entity));
>
>
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