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Date: Wed, 10 Mar 2010 23:36:00 -0000
From: "jistone at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sources.redhat.com
Message-ID: <20100310233612.11370.jistone@redhat.com>
Reply-To: sourceware-bugzilla@sourceware.org
Subject: [Bug translator/11370] New: multi-header @cast
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Sometimes a header may not #include everything that it needs to stand alone, and
so @cast will fail to build a module around it:

$ stap -ue 'probe begin {
println(&@cast(0, "fs_struct", "kernel<linux/fs_struct.h>")->root)
}' --vp 04
Running make -C '/lib/modules/2.6.32.9-67.fc12.x86_64/build'
M='/tmp/staprfow66/typequery_kmod_1' modules ARCH="x86_64" V=1
[...]
include/linux/fs_struct.h:8: error: expected specifier-qualifier-list before
‘rwlock_t’
include/linux/fs_struct.h:16: warning: ‘struct task_struct’ declared inside
parameter list
include/linux/fs_struct.h:16: warning: its scope is only this definition or
declaration, which is probably not what you want
[...]
semantic error: type definition 'fs_struct' not found: identifier '@cast' at
<input>:2:10
        source: println(&@cast(0, "fs_struct", "kernel<linux/fs_struct.h>")->root)
                         ^

We could work around this by allowing @cast to specify multiple headers which
should be compiled together.  Frank suggested listing them like this:

  @cast(x, "foo", "kernel<foo.h><bar.h>")->...

-- 
           Summary: multi-header @cast
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: jistone at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11370

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