Added 2 constants:
DT_TLSDESC_PLT = 0x6FFFFEF6, Location of PLT entry for TLS descriptor resolver calls.
DT_TLSDESC_GOT = 0x6FFFFEF7, Location of GOT entry used by TLS descriptor resolver PLT entry.
Constants were taken from "Thread-Local Storage Descriptors for IA32 and AMD64/EM64T Version 0.9.5" http://www.fsfla.org/~lxoliva/writeups/TLS/RFC-TLSDESC-x86.txt
Differential revision: http://reviews.llvm.org/D16185
llvm-svn: 257911
This file was failing to build with asan enabled. The reason being that
applyFixupFinal was writing 4-bytes worth of fixup in to an atom only
a single byte in length.
The test case didn't actually need this particular reloc so i've removed
it, although i'll follow up with future commits to actually verify that
relocs are to an address with enough space for the fixup to be applied.
llvm-svn: 257906
When importing a schedule, do not verify the load/store alignment of
scalar accesses. Scalar loads/store are always created newly in code
generation with no alignment restrictions. Previously, scalar alignment
was checked if the access instruction happened to be a LoadInst or
StoreInst, but only its array (MK_Array) access is relevant.
This will be implicitly unit-tested when the access instruction of a
value read can be nullptr.
Differential Revision: http://reviews.llvm.org/D15680
llvm-svn: 257904
platforms.
With ELF, the alignment of a global variable in a shared library will
get copied into an executables linked against it, if the executable even
accesss the variable. So, it's not possible to implicitly increase
alignment based on access patterns, or you'll break existing binaries.
This happened to affect libc++'s std::cout symbol, for example. See
thread: http://thread.gmane.org/gmane.comp.compilers.clang.devel/45311
(This is a re-commit of r257719, without the bug reported in
PR26144. I've tweaked the code to not assert-fail in
enforceKnownAlignment when computeKnownBits doesn't recurse far enough
to find the underlying Alloca/GlobalObject value.)
Differential Revision: http://reviews.llvm.org/D16145
llvm-svn: 257902
TestConcurrentEvents was marked with a XFAIL decorator at class level, which actually does not
work, and causes the class to be silently skipped everywhere. It seems that making it work at
class level is quite a difficult task, so I will just move it to the individual test methods. I
will follow this up with a commit which makes the decorator blow up in case someone tries to
apply it to a class in the future.
llvm-svn: 257901
This contains a fix for the issue that caused the revert:
we no longer assume that we can insert instructions after the
instruction that produces the base pointer. We previously
assumed that this would be ok, because the instruction produces
a value and therefore is not a terminator. This is false for invoke
instructions. We will now insert these new instruction directly
at the location of the users.
Original commit message:
[InstCombine] Look through PHIs, GEPs, IntToPtrs and PtrToInts to expose more constants when comparing GEPs
Summary:
When comparing two GEP instructions which have the same base pointer
and one of them has a constant index, it is possible to only compare
indices, transforming it to a compare with a constant. This removes
one use for the GEP instruction with the constant index, can reduce
register pressure and can sometimes lead to removing the comparisson
entirely.
InstCombine was already doing this when comparing two GEPs if the base
pointers were the same. However, in the case where we have complex
pointer arithmetic (GEPs applied to GEPs, PHIs of GEPs, conversions to
or from integers, etc) the value of the original base pointer will be
hidden to the optimizer and this transformation will be disabled.
This change detects when the two sides of the comparison can be
expressed as GEPs with the same base pointer, even if they don't
appear as such in the IR. The transformation will convert all the
pointer arithmetic to arithmetic done on indices and all the relevant
uses of GEPs to GEPs with a common base pointer. The GEP comparison
will be converted to a comparison done on indices.
Reviewers: majnemer, jmolloy
Subscribers: hfinkel, jevinskie, jmolloy, aadg, llvm-commits
Differential Revision: http://reviews.llvm.org/D15146
llvm-svn: 257897
Provide separate visitor templates for the three hierarchies, and also
the `FullSValVisitor' class, which is a union of all three visitors.
Additionally, add a particular example visitor, `SValExplainer', in order to
test the visitor templates. This visitor is capable of explaining the SVal,
SymExpr, or MemRegion in a natural language.
Compared to the reverted r257605, this fixes the test that used to fail
on some triples, and fixes build failure under -fmodules.
Differential Revision: http://reviews.llvm.org/D15448
llvm-svn: 257893
Summary:
Simplify the memory management of mock IR in test AlterInvokeBundles.
Reviewers: dblaikie
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D16211
llvm-svn: 257892
Added check for terminator CIE/FDE which has zero data size.
void EHOutputSection<ELFT>::addSectionAux(
...
// If CIE/FDE data length is zero then Length is 4, this
// shall be considered a terminator and processing shall end.
if (Length == 4)
break;
...
After this "Bug 25923 - lld/ELF2 linked application crashes if exceptions were used." is fixed for me. Self link of clang also works.
Initial commit message:
[ELF] - implemented --eh-frame-hdr command line option.
--eh-frame-hdr
Request creation of ".eh_frame_hdr" section and ELF "PT_GNU_EH_FRAME" segment header.
Both gold and the GNU linker support an option --eh-frame-hdr which tell them to construct a header for all the .eh_frame sections. This header is placed in a section named .eh_frame_hdr and also in a PT_GNU_EH_FRAME segment. At runtime the unwinder can find all the PT_GNU_EH_FRAME segments by calling dl_iterate_phdr.
This section contains a lookup table for quick binary search of FDEs.
Detailed info can be found here:
http://www.airs.com/blog/archives/462
Differential revision: http://reviews.llvm.org/D15712
llvm-svn: 257889
There are several requirements that ended up with this design;
1. Matching bitreversals is too heavyweight for InstCombine and doesn't really need to be done so early.
2. Bitreversals and byteswaps are very related in their matching logic.
3. We want to implement support for matching more advanced bswap/bitreverse patterns like partial bswaps/bitreverses.
4. Bswaps are best matched early in InstCombine.
The result of these is that a new utility function is created in Transforms/Utils/Local.h that can be configured to search for bswaps, bitreverses or both. InstCombine uses it to find only bswaps, CGP uses it to find only bitreversals.
We can then extend the matching logic in one place only.
llvm-svn: 257875
1) Print qualifiers for templates with zero arguments
2) Add a few more tests for the template type diffing refactoring.
Specifically, PR24587 has been fixed and has a test case from
http://reviews.llvm.org/D15384
3) Adds asserts to check the DiffTree is in correct state when moving nodes
4) Rename the field FromType and ToType since it is heavily used within
member functions.
llvm-svn: 257870
Remove an old assertion that does not hold. It is possible for a template
argument to be a declaration in one instantiation and an integer in another.
Create two new diff kinds for these (decl vs int and int vs decl).
llvm-svn: 257869
Allow "mode" attribute to be applied to VarDecl, not ValueDecl (which includes FunctionDecl and EnumConstantDecl), emit an error if this attribute is used with function declarations and enum constants.
Differential Revision: http://reviews.llvm.org/D16112
llvm-svn: 257868
This attribute may be attached to a function definition and instructs the backend to generate appropriate function entry/exit code so that
it can be used directly as an interrupt handler.
The IRET instruction, instead of the RET instruction, is used to return from interrupt or exception handlers. All registers, except for the EFLAGS register which is restored by the IRET instruction, are preserved by the compiler.
Any interruptible-without-stack-switch code must be compiled with -mno-red-zone since interrupt handlers can and will, because of the hardware design, touch
the red zone.
interrupt handler must be declared with a mandatory pointer argument:
struct interrupt_frame;
__attribute__ ((interrupt))
void f (struct interrupt_frame *frame) {
...
}
and user must properly define the structure the pointer pointing to.
exception handler:
The exception handler is very similar to the interrupt handler with a different mandatory function signature:
#ifdef __x86_64__
typedef unsigned long long int uword_t;
#else
typedef unsigned int uword_t;
#endif
struct interrupt_frame;
__attribute__ ((interrupt))
void f (struct interrupt_frame *frame, uword_t error_code) {
...
}
and compiler pops the error code off stack before the IRET instruction.
The exception handler should only be used for exceptions which push an error code and all other exceptions must use the interrupt handler.
The system will crash if the wrong handler is used.
Differential Revision: http://reviews.llvm.org/D15709
llvm-svn: 257867
Summary:
1. Android doesn't support __thread keyword. So allocate ThreadState
dynamically and store its pointer in one TLS slot provided by Android.
2. On Android, intercepted functions can be called before ThreadState
is initialized. So add test of thr_->is_inited in some places.
3. On Android, intercepted functions can be called after ThreadState
is destroyed. So add a fake dead_thread_state to represent all
destroyed ThreadStates. And that is also why we don't store the pointer
to ThreadState in shadow memory of pthread_self().
Reviewers: kcc, eugenis, dvyukov
Subscribers: kubabrecka, llvm-commits, tberghammer, danalbert, srhines
Differential Revision: http://reviews.llvm.org/D15301
llvm-svn: 257866
This commit is a follow-up to r251734, r251476, and r249735, which fixes
a bug where function attributes were not attached to thread local
wrapper functions.
rdar://problem/20828324
llvm-svn: 257865
Summary:
Document the LLVM_BUILD_LLVM_DYLIB and LLVM_LINK_LLVM_DYLIB
CMake options, move BUILD_SHARED_LIBS out of frequently-used,
and add a note/warning to BUILD_SHARED_LIBS.
Reviewers: beanz, delcypher, mjacob
Subscribers: mjacob, llvm-commits
Differential Revision: http://reviews.llvm.org/D16208
llvm-svn: 257864
first token of the expansion, don't forget to copy the "is at the start of a
line" token (which is always false, as newlines cannot appear within a macro
body); otherwise, stringizing the result can insert spurious whitespace.
llvm-svn: 257863
Summary:
Android doesn't intercept sigfillset, so REAL(sigfillset) is null.
And we can use internal_sigfillset() for all cases.
Reviewers: kcc, eugenis, kubabrecka, dvyukov
Subscribers: llvm-commits, tberghammer, danalbert
Differential Revision: http://reviews.llvm.org/D15296
llvm-svn: 257862
Save the integer type when diffing integers in template type diffing. When
integers are different sizes, print out the type along with the integer value.
Also with the type information, print true and false instead of 1 and 0 for
boolean values.
llvm-svn: 257861
George Rimar