[llvm-dev] Question about ObjectSizeOffsetVisitor::visitGlobalVariable

[George Burgess IV via llvm-dev]

Looks like the commit that added that was
https://github.com/llvm/llvm-project/commit/16e42128c24f5df8a61cfd2e6cdf3bd3966db0c5
. A reduced example might look something like this:
https://godbolt.org/z/r4G_g-

At the C source level, static object size detection has to be similarly
conservative in the face of 'variable-length' structs like `struct
my_string { size_t size; char data[0]; };`, though I don't know how
relevant that is here.

On Tue, Jan 28, 2020 at 11:41 PM Karl Rehm via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> In this function (used to check the size of a global) there is an initial
> check for whether the initializer to this function is "definitive." My
> question is: why do we need this? How does the object's size change if a
> global's initializer is defined at link time?
>
> Thanks,
> Karl
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