This adds debug tracing to the table-generated assembly instruction matcher,
enabled by the -debug-only=asm-matcher option.
The changes in the target AsmParsers are to add an MCInstrInfo reference under
a consistent name, so that we can use it from table-generated code. This was
already being used this way for targets that use deprecation warnings, but 5
targets did not have it, and Hexagon had it under a different name to the other
backends.
llvm-svn: 315445
* Prevent dumping of characters in DumpDataExtractor() with
item_byte_size bigger than 8 bytes. This case is not supported by the
code and results in a crash because the code calls
DataExtractor::GetMaxU64Bitfield() -> GetMaxU64() that asserts for
byte size > 8 bytes.
* Teach DataExtractor::GetMaxU64(), GetMaxU32(), GetMaxS64() and
GetMaxU64_unchecked() how to handle byte sizes that are not a multiple
of 2. This allows DumpDataExtractor() to dump characters and booleans
with item_byte_size in the interval of [1, 8] bytes. Values that are
not a multiple of 2 would previously result in a crash because they
were not handled by GetMaxU64().
llvm-svn: 315444
Adding this test files now so after another commit that will add a new pattern for
TESTM and TESTNM instructions will show the improvemnts that have been done.
Change-Id: If3908b7f91897d764053312365a2bc1de78b291d
llvm-svn: 315443
This is PR34546.
Currently LLD creates output sections even if it has no input sections,
but its command contains an assignment.
Committed code just assigns the same flag that was used in previous
live section.
That does not work sometimes. For example if we have following script:
.ARM.exidx : { *(.ARM.exidx*) }
.foo : { _foo = 0; } }
Then first section has SHF_LINK_ORDER flag. But section foo should not.
That was a reason of crash in OutputSection::finalize(). LLD tried to calculate
Link value, calling front() on empty input sections list.
We should only keep access flags and omit all others when creating such sections.
Patch fixes the crash observed.
Differential revision: https://reviews.llvm.org/D37736
llvm-svn: 315441
This patch fixes the miscompile that happens when PRE hoists loads across guards and
other instructions that don't always pass control flow to their successors. PRE is now prohibited
to hoist across such instructions because there is no guarantee that the load standing after such
instruction is still valid before such instruction. For example, a load from under a guard may be
invalid before the guard in the following case:
int array[LEN];
...
guard(0 <= index && index < LEN);
use(array[index]);
Differential Revision: https://reviews.llvm.org/D37460
llvm-svn: 315440
This is breaking a build of https://github.com/abseil/abseil-cpp and so
likely not really NFC. Also reverted subsequent r314956/7.
I'll forward reproduction instructions to Richard.
llvm-svn: 315439
Sinking of unordered atomic load into loop must be disallowed because it turns
a single load into multiple loads. The relevant section of the documentation
is: http://llvm.org/docs/Atomics.html#unordered, specifically the Notes for
Optimizers section. Here is the full text of this section:
> Notes for optimizers
> In terms of the optimizer, this **prohibits any transformation that
> transforms a single load into multiple loads**, transforms a store into
> multiple stores, narrows a store, or stores a value which would not be
> stored otherwise. Some examples of unsafe optimizations are narrowing
> an assignment into a bitfield, rematerializing a load, and turning loads
> and stores into a memcpy call. Reordering unordered operations is safe,
> though, and optimizers should take advantage of that because unordered
> operations are common in languages that need them.
Patch by Daniil Suchkov!
Reviewed By: reames
Differential Revision: https://reviews.llvm.org/D38392
llvm-svn: 315438
IRCE should not apply when the safe iteration range is proved to be empty.
In this case we do unneeded job creating pre/post loops and then never
go to the main loop.
This patch makes IRCE not apply to empty safe ranges, adds test for this
situation and also modifies one of existing tests where it used to happen
slightly.
Reviewed By: anna
Differential Revision: https://reviews.llvm.org/D38577
llvm-svn: 315437
Usually, a function that does symbol lookup takes symbol name as
its first argument. Also, if a function takes a source location hint,
it is usually the last parameter. So the previous parameter order
was counter-intuitive.
llvm-svn: 315433
Because of r314495, DefinedCommon symbols cannot reach to
getSymbolValue function. When they reach the fucntion, they have
already been converted to DefinedRegular symbols.
llvm-svn: 315432
We used CurAddressState to capture a dynamic context just like
we use lambdas to capture static contexts. So, CurAddressState
is used everywhere in LinkerScript.cpp. It is worth a shorter
name.
llvm-svn: 315418
elf utils implements a particularly extreme form of stripping that I'd
like to support. eu-strip has an option called "strip-sections" that
removes all section headers and leaves only program headers and the
segment data. I have implemented this option partly as a test but mainly
because in Fuchsia we would like to use this option to minimize the size
of our executables. The other strip options that are on my list include
--strip-all and --strip-debug. This is a preliminary implementation that
I'd like to start using in Fuchsia builds if possible. This change
implements such a stripping option for llvm-objcopy
Differential Revision: https://reviews.llvm.org/D38335
llvm-svn: 315412
MCObjectStreamer owns its MCAsmBackend -- this fixes the types to reflect that,
and allows us to remove another instance of MCObjectStreamer's weird "holding
ownership via someone else's reference" trick.
llvm-svn: 315410
"Commands" was ambiguous because in the linker script, everything is
a command. We used to handle only SECTIONS commands, and at the time,
it might make sense to call them the commands, but it is no longer
the case. We handle not only SECTIONS but also MEMORY, PHDRS, VERSION,
etc., and they are all commands.
llvm-svn: 315409
Of course, casting an unsigned value too large for 'int' is UB. So,
write out the ternary. LLVM folds it to ADD anyway.
Fixes the warning from r303693 a different way.
Thanks to Erich Keane for pointing this out!
llvm-svn: 315406
HasSections is true if there is at least one SECTIONS linker
script command, and it is not directly related to whether we have
section objects or not. So I think the new name is better.
llvm-svn: 315405
ScriptConfiguration was a class to contain parsed results of
linker scripts. LinkerScript is a class to interpret it.
That ditinction was needed because we haven't instantiated
LinkerScript early (because, IIRC, LinkerScript class was a
ELFT template function). So, when we parse linker scripts,
we couldn't directly store the result to a LinkerScript instance.
Now, that limitation is gone. We instantiate LinkerScript
at the very beginning of our main function. We can directly
store parse results to a LinkerScript instance.
llvm-svn: 315403
Because addRegular's functionality is tightly coupled with
addSymbol, and the former is called only once, it makes sense
to merge the two functions. This patch also adds comments.
llvm-svn: 315401
Fixes PR34306.
This is because it usually results in more compact code, and because
there are also known code generation bugs when using the PIC model
(see bug).
Based on a patch by Carlo Kok.
Differential Revision: https://reviews.llvm.org/D38769
llvm-svn: 315400
Simon Dardis