[Bug translator/33428] New: support/prefer @cast against kernel omnibus vmlinux.h

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=33428

            Bug ID: 33428
           Summary: support/prefer @cast against kernel omnibus vmlinux.h
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

On recent kernel, the build process creates a vmlinux.h file, which contains
most or all kernel/module type declarations.  While this was done for BPF
support purposes, it could be handy for systemtap too.  When available,
systemtap should learn to use it as a typequery source, in preference to
debuginfo or fragile kernel<foo/bar.h> pseudo-module names in @cast operations.

This could work by support for a dwflpp.cxx module name "kernel<vmlinux.h>",
which would be specially treated in make_typequery(), and inserted
automagically before any "kernel*" component in a @cast module list.  This
could also be handy for tracepoint parameter type decoding too.

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