The only purpose of the dtc_references_dts0 testcase was to check
handling of references in the old dts v0 syntax. Since we no longer
support the old syntax, and the references_dts0.dts has been converted
to the new format, it's entirely redundant. This patch removes it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Currently, nothing will stop you from re-using the same label string
multiple times in a dts, e.g.:
/ {
samelabel: prop1 = "foo";
samelabel: prop2 = "bar";
};
or
/ {
samelabel: prop1 = "foo";
samelabel: subnode {
};
};
When using node references by label, this could lead to confusing
results (with no warning), and in -Oasm mode will result in output
which the assembler will complain about (since it too will have
duplicate labels).
This patch, therefore, adds code to checks.c to give errors if you
attempt to re-use the same label. It treats all labels (node,
property, and value) as residing in the same namespace, since the
assembler will treat them so for -Oasm mode.
Testcases for the new code are also added.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Currently, when in -Idts -Odtb or -Ifs -Odtb modes, dtc always
defaults to using 0 as the value for the boot_cpuid_phys header field.
That's correct quite often, but there are some systems where there is
no CPU with hardware ID of 0, or where we don't want to use the CPU
with hardware ID 0 at all (e.g. for AMP-style partitioning). The only
way to override this default currently, is with the -b command line
option.
This patch improves dtc to instead base the default boot_cpuid_phys
value on the reg property of the first listed subnode of /cpus. This
means that dtc will get boot_cpuid_phys correct by default in a
greater proportion of cases (since the boot cpu is usually listed
first, and this way at least the boot_cpuid_phys default will match
some existing cpu node). If the node doesn't exist or has an invalid
'reg' property (missing or not 4 bytes in length), then
boot_cpuid_phys is set to 0.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Currently, the Linux kernel, libfdt and dtc, when using flattened
device trees encode a node's phandle into a property named
"linux,phandle". The ePAPR specification, however - aiming as it is
to not be a Linux specific spec - requires that phandles be encoded in
a property named simply "phandle".
This patch adds support for this newer approach to dtc and libfdt.
Specifically:
- fdt_get_phandle() will now return the correct phandle if it
is supplied in either of these properties
- fdt_node_offset_by_phandle() will correctly find a node with
the given phandle encoded in either property.
- By default, when auto-generating phandles, dtc will encode
it into both properties for maximum compatibility. A new -H
option allows either only old-style or only new-style
properties to be generated.
- If phandle properties are explicitly supplied in the dts
file, dtc will not auto-generate ones in the alternate format.
- If both properties are supplied, dtc will check that they
have the same value.
- Some existing testcases are updated to use a mix of old and
new-style phandles, partially testing the changes.
- A new phandle_format test further tests the libfdt support,
and the -H option.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
I've just tested building dtc as an x86_64 binary on a 32-bit i386
host by using:
make CC="gcc -m64"
This patch fixes a handful of minor bugs thus discovered:
* There is a printf() type mismatch on 64-bit in value-labels.c
* For the tests which use libdl, we were using the GNU make feature
where it will find libdl.so given a dependency in the form '-ldl'.
But this built-in make logic doesn't know we're compiling 64-bit so
finds the 32-bit version of the library. We avoid using this and
instead explicitly pass -ldl to CC, which being the 64-bit version
does know where to look.
* To process dtc's asm output into .so files, run_tests.sh was
directly invoking the (default instance of) the assembler and linker.
Instead invoke these via the CC driver, and allow that to be overriden
from the make environment.
* The x86_64 assembler doesn't 0 fill with the .balign directive
(presumably it is NOP filling). That doesn't produce strictly
incorrect trees, but it is confusing and confounds are testcases which
do byte-by-byte comparison of the trees produced by asm output with
direct dtb output (which does 0 pad where necessary, of course). This
patch uses the optional second argument to .balign to force gas to
zero-fill instead.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
In one section, the run_tests script attempts to use the -e (interpret
escapes) option to echo. This option is not portable - for example
the echo built into dash, now the default /bin/sh on several
distributions does not support it and will just echo "-e" literally.
Since we don't actually use any of the escapes that -e enables, this
patch simply removes it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When in -Odts mode, dtc will not produce correct output for
string-like properties which have more than one \0 character at the
end of the property's bytestring. In fact, it generates output which
is not syntactically correct. This patch fixes the bug, and adds a
testcase for future regressions here.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds a testcase using asm output mode to check that labels
within property values are correctly processed.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds some testcases for dtc's -Oasm mode. Specifically it
checks that building the asm will result in the same device tree blob
in memory as -Odtb mode would produce, for a variety of trees. This
test uncovered two difficulties with our current -Oasm output, both of
which are addressed in this patch as well.
First, -Oasm output would only be correct if assembled for a
big-endian target. Usually that would be the case, when building
device trees into a firmware or similar. However this makes life
inconvenient for testing on a little-endian target, and one can think
up use cases where a program running on a little endian host might
want to embed a device tree for a big-endian target. This patch
therefore changes -Oasm output to use .byte directives instead of
.long throughout in order to generate byte-for-byte identical trees
regardless of the endianness of the assembler target.
Second, -Oasm output emitted several #define statements which were
then used in the innards of the output - i.e. it assumed the output
would be processed by cpp before being assembled. That may not be
convenient in all build environments, and in any case doesn't work
well with the above fix. So, -Oasm output no longer needs to be
preprocessed before assembling.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Build a libfdt shared library in addition to the existing .a that is
created. Symbol versioning is used from the libfdt/version.lds script.
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Currently, dtc will generate phandles for nodes which are referenced
elsewhere in the tree. phandles can also be explicitly assigned by
defining the linux,phandle property. However, there is no way,
currently to tell dtc to generate a phandle for a node if it is not
referenced elsewhere. This is inconvenient when it's expected that
later processing on the flat tree might add nodes which _will_
the node in question.
One way one might attempt to do this is with the construct:
mynode: mynode {
linux,phandle = <&mynode>;
/* ... */
};
Though it's a trifle odd, there's really only one sensible meaning
which can be assigned to this construct: allocate a unique phandle to
"mynode" and put that in its linux,phandle property (as always).
Currently, however, dtc will choke on this self-reference. This patch
corrects this, making the construct above give the expected results.
It also ensures a more meaningful error message is given if you
attempt to process the nonsensical construct:
mynode: mynode {
linux,phandle = <&someothernode>;
/* ... */
};
The 'references' testcase is extended to cover this case, as well.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
There's currently an off-by-one bug in fdt_subnode_offset_namelen()
which causes it to keep searching after it's finished the subnodes of
the given parent, and into the subnodes of siblings of the original
node which come after it in the tree.
This patch fixes the bug. It also extends the subnode_offset testcase
(updating all of the 'test_tree1' example trees in the process) to
catch it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Now that all in-kernel-tree DTS files are properly /dts-v1/,
remove direct support for the older, un-numbered DTS
source file format.
Convert existing tests to /dts-v1/ and remove support
for the conversion tests themselves.
For now, though, the conversion tool still exists.
Signed-off-by: Jon Loeliger <jdl@freescale.com>
Follows the model of the existing sub-Makefiles for dtc.
Adjust $(BIN) definition to represent installable bin programs
and use it as the list of installed programs rather than using
an enumerated list in the install target.
Adjust the tests/Makefile to clean up properly still.
Signed-off-by: Jon Loeliger <jdl@freescale.com>
Kumar has already added alias expansion to fdt_path_offset().
However, in some circumstances it may be convenient for the user of
libfdt to explicitly get the string expansion of an alias. This patch
adds a function to do this, fdt_get_alias(), and uses it to implement
fdt_path_offset().
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The current implementation of fdt_get_path() has a couple of bugs,
fixed by this patch.
First, contrary to its documentation, on success it returns the length
of the node's path, rather than 0. The testcase is correspondingly
wrong, and the patch fixes this as well.
Second, in some circumstances, it will return -FDT_ERR_BADOFFSET
instead of -FDT_ERR_NOSPACE when given insufficient buffer space.
Specifically this happens when there is insufficient space even to
hold the path's second last component. This behaviour is corrected,
and the testcase updated to check it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
If the path doesn't start with '/' check to see if it matches some alias
under "/aliases" and substitute the matching alias value in the path
and retry the lookup.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
This patch marks various functions not shared between c files
'static', as they should be. There are a couple of functions in dtc,
and many in the testsuite.
This is *almost* enough to enable the -Wmissing-prototypes warning.
It's not quite enough, because there's a mess of junk in the flex
generated code which triggers that warning which I'm not yet sure how
to deal with.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adjusts the testsuite to run most of the tests for the tree
checking code on input in dtb form as well as dts form. Some checks
which only make sense for dts input (like reference handling) are
excluded, as are those which currently take dtb input because they
rely on things which cannot be lexically constructed in a dts file.
This shows up two small bugs in dtc, which are also corrected.
First, the name_properties test which was is supposed to remove
correctly formed 'name' properties (because they can be reconstructed
from tne node name) was instead removing 'name' properties even if
they weren't correct.
Secondly, when using dtb or fs input, the runtime tree in dtc did not
have the parent pointer initialized propertly because.built
internally. The appropriate initialization is added to the
add_child() function.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch turns on the -Wpointer-arith option in the dtc Makefile,
and fixes the resulting warnings due to using (void *) in pointer
arithmetic. While convenient, pointer arithmetic on void * is not
portable, so it's better that we avoid it, particularly in libfdt.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
I've recently worked with a FreeBSD developer, getting dtc and libfdt
working on FreeBSD. This showed up a number of portability problems
in the dtc package which this patch addresses. Changes are as
follows:
- the parent_offset and supernode_atdepth_offset testcases
used the glibc extension functions strchrnul() and strndupa(). Those
are removed, using slightly longer coding with standard C functions
instead.
- some other testcases had a #define _GNU_SOURCE for no
particular reason. This is removed.
- run_tests.sh has bash specific constructs removed, and the
interpreter changed to /bin/sh. This apparently now runs fine on
FreeBSD's /bin/sh, and I've also tested it with both ash and dash.
- convert-dtsv0-lexer.l has some extra #includes added. These
must have been included indirectly with Linux and glibc, but aren't on
FreeBSD.
- the endian handling functions in libfdt_env.h, based on
endian.h and byteswap.h are replaced with some portable open-coded
versions. Unfortunately, these result in fairly crappy code when
compiled, but as far as I can determine there doesn't seem to be any
POSIX, SUS or de facto standard way of determining endianness at
compile time, nor standard names for byteswapping functions.
- some more endian handling, from testdata.h using the
problematic endian.h is simply removed, since it wasn't actually being
used anyway.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds a testcase for the /include/ directive. It assembles
a sample dts file with many /include/ directives at a variety of
different lexical / grammatical contexts.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
On Wed, Jun 04, 2008 at 09:26:23AM -0500, Jon Loeliger wrote:
> David Gibson wrote:
>
>> But as I said that can be dealt with in the future without breaking
>> compatibility. Objection withdrawn.
>>
>
> And on that note, I officially implore Scott to
> re-submit his binary include patch!
Scott's original patch does still have some implementation details I
didn't like. So in the interests of saving time, I've addressed some
of those, added a testcase, and and now resubmitting my revised
version of Scott's patch.
dtc: Add support for binary includes.
A property's data can be populated with a file's contents
as follows:
node {
prop = /incbin/("path/to/data");
};
A subset of a file can be included by passing start and size parameters.
For example, to include bytes 8 through 23:
node {
prop = /incbin/("path/to/data", 8, 16);
};
As with /include/, non-absolute paths are looked for in the directory
of the source file that includes them.
Implementation revised, and a testcase added by David Gibson
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Scott Wood <scottwood@freescale.com>
This patch adds an extra testcase to dtc to ensure that the
"reg_format" and "ranges_format" checks trigger as they should if a
'reg' or 'ranges' property appears in the root node.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Currently, dtc generates a few gcc build warnings if built for a
64-bit target, due to the altered type of uint64_t and size_t. This
patch fixes the warnings (without generating new warnings for 32-bit).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Some of the helper scripts used to run testcases contain some
constructs that are bashisms. Or at least which don't work on dash,
the minimal shell used as /bin/sh on recent Ubuntu systems.
This patch removes these constructs so that the testsuite will pass
"out of the box" on systems where /bin/sh is dash.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds a new utility program, convert-dtsv0, to the dtc
sources. This program will convert dts files from v0 to v1,
preserving comments and spacing. It also includes some heuristics to
guess an appropriate base to use in the v1 output (so it will use hex
for the contents of reg properties and decimal for clock-frequency
properties, for example). They're limited and imperfect, but not
terrible.
The guts of the converter program is a modified version of the lexer
from dtc itself.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Currently, dtc will put the nonsense value 0xfeedbeef into the
boot_cpuid_phys field of an output blob, unless explicitly given
another value with the -b command line option. As well as being a
totally unuseful default value, this also means that dtc won't
properly preserve the boot_cpuid_phys field in -I dtb -O dtb mode.
This patch reworks things to improve the boot_cpuid handling. The new
semantics are that the output's boot_cpuid_phys value is:
the value given on the command line if -b is used
otherwise
the value from the input, if in -I dtb mode
otherwise
0
Implementation-wise we do the following:
- boot_cpuid_phys is added to struct boot_info, so that
structure now contains all of the blob's semantic information.
- dt_to_blob() and dt_to_asm() output the cpuid given in
boot_info
- dt_from_blob() fills in boot_info based on the input blob
- The other dt_from_*() functions just record 0, but we can
change this easily if e.g. we invent a way of specifying the boot cpu
in the source format.
- main() overrides the cpuid in the boot_info between input
and output if -b is given
We add some testcases to check this new behaviour.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Currently the Makefile.dtc and Makefile.libfdt fragments include a
number of things that seemed like they might be useful for other
projects embedding the pieces, or for a make dist target.
Well, we have no make dist target, it's become fairly unclear that
these things would actually be useful to embedders (the kernel
certainly doesn't use them), and it's a bunch of stuff with no current
users.
This patch, therefore, removes a bunch of unused definitions from the
Makefile fragments. It also removes a dependency declared in
Makefile.libfdt (of libfdt.a on the constituent .o files) which was
incorrect (wrong path), and if corrected would be redundant with the
similar dependency in the top-level makefile.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds some testcases checking corner cases of dtc's input
file handling. Specifically it checks that dtc works correctly when
given input via stdin, and it checks that dtc fails gracefully if
given a nonexistent input file (or directory, in the case of -Ifs
mode).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch makes several small improvements to the test harness.
* An altered way of invoking shell script testcases from run_tests.sh
means scripts no longer need to me marked executable in the
repository to work properly.
* dtc.sh never did anything that was really dtc specific - with the
exception of messages, it would work equally well for any binary
that returns 0 in the successful case. Therefore, generalise dtc.sh
and fold it into run_tests.sh so we don't need a separate script any
more.
* Tweak various things so that the valgrind options are properly
propagated down to invoke dtc under valgrind when called via wrapper
scripts.
* Tweak the valgrind suppressions to work properly on a wider range of
systems (this was necessary on my machine running Ubuntu Hardy).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds testcases which test dtc when used to convert between
different dtb versions. These tests uncovered a couple of bugs
handling old dtb versions, which are also fixed.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds checks to the checking framework to verify that node
and property names contain only legal characters, and in the case of
node names there is at most one '@'.
At present when coming from dts input, this is mostly already ensured
by the grammer, however putting the check later means its easier to
generate helpful error messages rather than just "syntax error". For
dtb input, these checks replace the older similar check built into
flattree.c.
Testcases for the checks are also implemented.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
In light of the recently discovered bug with NOP handling, this adds
some more testcases for NOP handling. Specifically, it adds a helper
program which will add a NOP tag after every existing tag in a dtb,
and runs the standard battery of tests over trees mangled in this way.
For now, this does not add a NOP at the very beginning of the
structure block. This causes problems for libfdt at present, because
we assume in many places that the root node's BEGIN_NODE tag is at
offset 0. I'm still contemplating what to do about this (with one
option being simply to declare such dtbs invalid).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
For ages dtc has included a sample dts, comment-test.dts, for checking
various lexical corner cases in comment processing. In fact, it
predates the automated testsuite, and has never been integrated into
it. This patch addresses this oversight, folding the comment handling
test in with the rest of the testsuite.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
fdt_add_subnode_namelen() has a bug if asked to add a subnode to a
node which has NOP tags interspersed with its properties. In this
case fdt_add_subnode_namelen() will put the new subnode before the
first NOP tag, even if there are properties after it, which will
result in an invalid blob.
This patch fixes the bug, and adds a testcase for it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds an fdt_set_name() function to libfdt, mirroring
fdt_get_name(). This is a r/w function which alters the name of a
given device tree node.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When I released libfdt, I forgot to add a copyright notice to
dumptrees.c (probably because the program is so trivial). Apparently
the lack causes trouble for Debian, so this patch adds one. I've gone
through the git history and double checked that no-one has touched
this file except me (and I barely have myself since its initial
commit).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Since commit 5ba0086bfd, the
dtc-checkfails.sh script does not check the return code from dtc.
That's reasonable, since depending on the checks we're testing, dtc
could either complete succesfully or return an error.
However, it's never right for dtc to SEGV or otherwise be killed by a
signal. So the script should catch that, and fail the testcase if it
happens. This patch implements this behaviour.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This converts the test for the obsolete "interrupt-controller"
property in /chosen to the new framework. That was the only thing
left in the old-style check_chosen() function, so that function is
removed, too.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch converts checks related to #address-cells and #size-cells
to the new framework. Specifically, it reimplements the check that
"reg" properties have a valid size based on the relevant
#address-cells and #size-cells values. The new implementation uses
the correct default value, unlike the old-style check which assumed
the values were inherited by default.
It also implements a new, similar test for "ranges" properties.
Finally, since relying on the default values of these variables is
considered not-good-practice these days, it implements a "style" check
which will give a warning if the tree ever relies on the default
values (that is if any node with either "reg" or "ranges" appears
under a parent which has no #address-cells or #size-cells property).
This patch converts to the new tree checking framework those checks
which verify that certain properties (device_type, model) have a
string value, when present.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch converts to the new tree checking framework those checks
which verify that certain properties (#address-cells and #size-cells)
are exactly one cell in size, when present.
We also drop the old-style check for "linux,phandle" being one cell,
since that is already implied in the the existing new-style checks on
the linux,phandle property.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch modifies the dtc-checkfails.sh testcase wrapper so that
instead of testing just that dtc fails with a particular error code on
the sample input, it scans dtc's stderr output looking for a message
that dtc failed a specific check or checks. This has several advantages:
- It means we more precisely check dtc's checking behaviour
- It means we can check for generation of warnings using the
same script
- It means we can test cases where dtc should generate
multiple errors or warnings from different checks
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch extends dtc syntax to allow references (&label, or
&{/full/path}) directly within property definitions, rather than
inside a cell list. Such references are expanded to the full path of
the referenced node, as a string, instead of to a phandle as
references within cell lists are evaluated.
A testcase is also included.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
On several occasions, I've accidentally put properties after subnodes
in a dts file. I've then spent ages thinking that the resulting
syntax error was because of something else.
This patch arranges for this specific syntax error to generate a more
specific and useful error message.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch removes the old-style checking code for the "name" property
- i.e. verifying that the "name" property, if present, matches the
node name. It replaces it with a pair of more-or-less equivalent
checks in the new checking framework.
This also promotes this check to a "structural" check, or at least an
error-rather-than-warning test, since the structural/semantic
distinction doesn't really apply in the new framework.
A testcase for the check is also added.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The recent change to the lexer to only recognize property and node
names in the appropriate context removed a number of lexical warts in
our language that would have gotten ugly as we add expression support
and so forth.
But there's one nasty one remaining: references can contain a full
path, including the various problematic node name characters (',', '+'
and '-', for example). This would cause trouble with expressions, and
it also causes trouble with the patch I'm working on to allow
expanding references to paths rather than phandles. This patch
therefore reworks the lexer to mitigate these problems.
- References to labels cause no problems. These are now
recognized separately from references to full paths. No syntax change
here.
- References to full paths, including problematic characters
are allowed by "quoting" the path with braces
e.g. &{/pci@10000/somedevice@3,8000}. The braces protect any internal
problematic characters from being confused with operators or whatever.
- For compatibility with existing dts files, in v0 dts files
we allow bare references to paths as before &/foo/bar/whatever - but
*only* if the path contains no troublesome characters. Specifically
only [a-zA-Z0-9_@/] are allowed.
This is an incompatible change to the dts-v1 format, but since AFAIK
no-one has yet switched to dts-v1 files, I think we can get away with
it. Better to make the transition when people to convert to v1, and
get rid of the problematic old syntax.
Strictly speaking, it's also an incompatible change to the v0 format,
since some path references that were allowed before are no longer
allowed. I suspect no-one has been using the no-longer-supported
forms (certainly none of the kernel dts files will cause trouble).
We might need to think about this harder, though.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
dtc: Flexible tree checking infrastructure
Here, at last, is a substantial start on revising dtc's infrastructure
for checking the tree; this is the rework I've been saying was
necessary practically since dtc was first release.
In the new model, we have a table of "check" structures, each with a
name, references to checking functions, and status variables. Each
check can (in principle) be individually switched off or on (as either
a warning or error). Checks have a list of prerequisites, so if
checks need to rely on results from earlier checks to make sense (or
even to avoid crashing) they just need to list the relevant other
checks there.
For now, only the "structural" checks and the fixups for phandle
references are converted to the new mechanism. The rather more
involved semantic checks (which is where this new mechanism will
really be useful) will have to be converted in future patches.
At present, there's no user interface for turning on/off the checks -
the -f option now forces output even if "error" level checks fail.
Again, future patches will be needed to add the fine-grained control,
but that should be quite straightforward with the infrastructure
implemented here.
Also adds a testcase for the handling of bad references, which catches
a bug encountered while developing this patch.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
David Gibson