Commit Graph

177 Commits

Author SHA1 Message Date
Siva Chandra 97417e0300 [libc] Enable threads.h functions on aarch64.
Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D122788
2022-03-31 08:42:07 -07:00
Siva Chandra Reddy 441606f5ff [libc] Add implementations of fopen, flose, fread, fwrite and fseek.
A follow up patch will add feof and ferror.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D122327
2022-03-24 04:20:12 +00:00
Michael Jones 6d0f5d95ad [libc][obvious] add aligned_alloc as entrypoint
This patch adds aligned_alloc as an entrypoint. Previously it was being
included implicitly.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D122362
2022-03-23 16:44:15 -07:00
Michael Jones 805899e68a [libc] Change FEnv to use MXCSR as source of truth
This patch primarily fixes the fenv implementation on Windows, since
Windows uses the MXCSR in place of the x87 status registers for storing
information about the floating point environment. This allows FEnv to
work correctly on Windows, and successfully build.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D121839
2022-03-23 16:08:00 -07:00
Siva Chandra Reddy 7fdb50c813 [libc] Add a new rule add_integration_test.
All existing loader tests are switched to an integration test added with
the new rule. Also, the getenv test is now enabled as an integration test.

All loader tests have been moved to test/integration. Also, the simple
checker library for the previous loader tests has been moved to a
separate directory of its own.

A follow up change will perform more cleanup of the loader CMake rules
to eliminate now redundent options.

Reviewed By: lntue, michaelrj

Differential Revision: https://reviews.llvm.org/D122266
2022-03-23 20:57:29 +00:00
Siva Chandra Reddy 827575a7f8 [libc] Add implementation of POSIX lseek function.
Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D121676
2022-03-15 16:24:48 +00:00
Tue Ly 0f031daea8 [libc] Initial support for darwin-aarch64.
Add initial support for darwin-aarch64 (macOS M1).

Some differences compared to linux-aarch64:
- `math.h` defined `math_errhandling` by the compiler builtin `__math_errhandling()` but Apple Clang 13.0.0 on M1 does not support `__math_errhandling()` builtin as a macro function or a constexpr function.
- `math.h` defines `UNDERFLOW` and `OVERFLOW` macros.
- Besides 5 usual floating point exceptions: `FE_INEXACT`, `FE_UNDERFLOW`, `FE_OVERFLOW`, `FE_DIVBYZERO`, and `FE_INVALID`, `fenv.h` also has another floating point exception: `FE_FLUSHTOZERO`.  The corresponding trap for `FE_FLUSHTOZERO` in the control register is at the different location compared to the status register.
- `FE_FLUSHTOZERO` exception flag cannot be raised with the default CPU floating point operation mode.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D120914
2022-03-10 09:26:09 -05:00
Siva Chandra Reddy fe2cc14ad4 [libc] Align the stack pointer in the start function.
The loader TLS test for x86_64, which now passes, has been enabled.
A future change should enable the test for aarch64 as well.

Reviewed By: jeffbailey

Differential Revision: https://reviews.llvm.org/D121091
2022-03-07 19:45:53 +00:00
Siva Chandra Reddy dd33f9cdef [libc] Make the errno macro resolve to the thread local variable directly.
With modern architectures having a thread pointer and language supporting
thread locals, there is no reason to use a function intermediary to access
the thread local errno value.

The entrypoint corresponding to errno has been replaced with an object
library as there is no formal entrypoint for errno anymore.

Reviewed By: jeffbailey, michaelrj

Differential Revision: https://reviews.llvm.org/D120920
2022-03-04 17:29:49 +00:00
Siva Chandra Reddy 75747c7394 [libc] Remove the remaining uses of stdatomic.h.
New methods to the Atomic class have been added as required. Futex
related types have been consolidated at a common place.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D120705
2022-03-01 17:12:39 +00:00
Alex Brachet d66983861a [libc] Add exit and atexit
Often atexit is implemented using __cxa_atexit. I have not implemented __cxa_atexit here because it potentially requires more discussion. It is unique for llvm-libc (I think) that it is an exported symbol that wouldn’t be defined in any spec file because it doesn’t have a header. Implementing it will be trivial given what is here already, but I figured it would be more contentious so it can be implemented later.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D119512
2022-02-17 17:21:55 +00:00
Raman Tenneti b305de142c [libc] [Obvious] Fix.
Removed getenv from entrypoints.

Reviewed By: rtenneti

Differential Revision: https://reviews.llvm.org/D119753
2022-02-14 11:48:07 -08:00
Raman Tenneti f2a7f83595 Introduce getenv to LLVM libc
Add support for getenv as defined by the Open Group's "System Interface &
 Header" in https://pubs.opengroup.org/onlinepubs/7908799/xsh/getenv.html

getenv requires a standard way of accessing the environment,
so a pointer to the environment is added to the startup in crt1.
Consquently, this function is not usable on top of other libcs.

Added starts_with method to StringView. getenv function uses it.

Co-authored-by: Jeff Bailey <jeffbailey@google.com>

Reviewed By: sivachandra, rtenneti

Differential Revision: https://reviews.llvm.org/D119403
2022-02-14 10:10:13 -08:00
Michael Jones 7eb5cb7f9e [libc] Fix allocator inclusion
Previously, allocator functions were only available if they were included
from scudo or by using the system libc headers (i.e. by turning off the
full build). This patch changes the logic to include the prototypes for
the allocator functitons in all cases, which allows the linker to link
in the system's allocator.

Reviewed By: sivachandra, abrachet

Differential Revision: https://reviews.llvm.org/D119587
2022-02-11 14:58:21 -08:00
Tue Ly 9e7688c71e [libc] Implement log1pf correctly rounded to all rounding modes.
Implement log1pf correctly rounded to all rounding modes relying on logf implementation for exponent > 2^(-8).

Reviewed By: sivachandra, zimmermann6

Differential Revision: https://reviews.llvm.org/D118962
2022-02-07 16:17:18 -05:00
Siva Chandra be7c865af1 [libc] Add a few missing deps, includes, and fix a few typos.
This allows us to enable rmdir, mkdir, mkdirat, unlink and unlinkat for
aarch64.
2022-02-01 00:26:36 -08:00
Siva Chandra Reddy b8385162c2 [libc] Add implementations of POSIX mkdir, mkdirat, rmdir, unlink and unlinkat.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D118641
2022-02-01 05:17:10 +00:00
Siva Chandra 0e91c48df0 [libc] Enable creat, fsync, open, openat, read and write for aarch64. 2022-01-28 12:06:08 -08:00
Siva Chandra Reddy 4abfe47e1f [libc] Add implementations of the POSIX creat and openat functions.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D118435
2022-01-28 19:28:12 +00:00
Siva Chandra Reddy dc2b01b3f7 [libc] Add POSIX close, fsync, open, read and write functions.
They are implemented as simple syscall wrappers. The file creation
macros have been put in a header file as a temporary solution until we
have a cleaner approach to listing platform relevant macros.

Reviewed By: abrachet

Differential Revision: https://reviews.llvm.org/D118396
2022-01-27 20:32:02 +00:00
Siva Chandra Reddy 09f2f81ce8 [libc][NFC] Move the POSIX write function to the default build on linux. 2022-01-27 17:29:13 +00:00
Tue Ly e581841e8c [libc] Implement log10f correctly rounded for all rounding modes.
Based on RLIBM implementation similar to logf and log2f.  Most of the exceptional inputs are the exact powers of 10.

Reviewed By: sivachandra, zimmermann6, santoshn, jpl169

Differential Revision: https://reviews.llvm.org/D118093
2022-01-25 10:33:39 -05:00
Siva Chandra Reddy 59eb542f60 [libc] Let header generator generate the type header inclusion boiler plate.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D117855
2022-01-24 23:25:19 +00:00
Siva Chandra Reddy 7f0f4cab18 [libc][NFC] Add 'struct_' prefix to type headers defining struct types.
This allows header generator to generate type inclusion boiler plate in
a straightforward manner.
2022-01-21 07:04:32 +00:00
Siva Chandra Reddy 284cd693f1 [libc] Move the remaining public types to their own type headers.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D117838
2022-01-20 23:04:26 +00:00
Siva Chandra Reddy 10ed3c9d2c [libc] Move type definitions to their own self contained header files.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D117282
2022-01-20 00:13:32 +00:00
Michael Jones 0b442db9f6 [libc] move strdup out of requiring SCUDO
strdup needs either scudo enabled or fullbuild disabled, this properly
adds the second condition

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D117138
2022-01-14 13:32:42 -08:00
Tue Ly 63d2df003e [libc] Implement correctly rounded log2f based on RLIBM library.
Implement log2f based on RLIBM library correctly rounded for all rounding modes.

Reviewed By: sivachandra, michaelrj, santoshn, jpl169, zimmermann6

Differential Revision: https://reviews.llvm.org/D115828
2022-01-14 12:40:49 -05:00
Michael Jones ba6a3972d7 [libc] add working ARM entrypoints
Some functions were added to x86_64 that were untested on Aarch64. Now
that I've had an opportunity to test them, they all work on Aarch64 with
the minor formatting change included.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D117146
2022-01-12 14:24:18 -08:00
Siva Chandra Reddy 134e9d1914 [libc][NFC] Move sys/mman entrypoints to the default build configs.
Specifically, mmap and munmap have been moved to the default build list
of entrypoints. To support this, certain deps and includes have been
adjusted. The use of errno in some cases has been updated.
2022-01-11 16:51:10 +00:00
Siva Chandra 371779fac1 [libc] Add linux aarch64 syscall implementation.
Add mmap and munmap to the linux aarch64 entrypoint list as the first
user of these syscalls.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D116949
2022-01-10 15:53:17 -08:00
Siva Chandra Reddy 3cc2161c89 [libc] Move the x86_64 syscall functions to OSUtil.
Reviewed By: michaelrj, lntue

Differential Revision: https://reviews.llvm.org/D116177
2021-12-22 21:48:57 +00:00
Tue Ly d08a801b5f [libc] Implement correctly rounded logf based on RLIBM library.
Implement correctly rounded logf based on RLIBM library: https://people.cs.rutgers.edu/~sn349/rlibm/.

Reviewed By: sivachandra, santoshn, jpl169, zimmermann6

Differential Revision: https://reviews.llvm.org/D115408
2021-12-16 13:43:15 -05:00
Siva Chandra Reddy 2cf203d9f6 [libc] Disable signal.h API and its users.
The signal.h header file from LLVM libc is incorrect. The signal API and
its users will be enabled once signal.h is fixed.
2021-12-16 05:52:28 +00:00
Michael Jones aa1902f917 [libc] add basic strtold implementation
Due to the differences between the types of long double, this function
is effectively three functions in one. This patch adds basic support for
the types of long double, although it's just using the fast path and the
fallback for the moment. I still need to implement a version of
Eisel-Lemire for performance, but the existing algorithms should be
correct.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D113710
2021-12-13 10:40:44 -08:00
Michael Jones 9b6f8b985c [libc] add stpcpy and stpncpy
Adds an implementation for stpcpy and stpncpy, which are posix extension
functions.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D111913
2021-11-04 11:39:26 -07:00
Michael Jones 3bbbec1ae7 [libc] add strndup
add an implementation of strndup

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D112846
2021-11-01 12:52:51 -07:00
Michael Jones 9830518082 [libc][obvious] fix strdup being listed twice
strdup was being included even if malloc wasn't and that was causing
a build failure.

Differential Revision: https://reviews.llvm.org/D112641
2021-10-27 11:13:08 -07:00
Michael Jones 65bb6593e5 [libc] add strdup implementation
Add an implementation for strdup.

Reviewed By: lntue, sivachandra

Differential Revision: https://reviews.llvm.org/D111584
2021-10-27 10:21:04 -07:00
Michael Jones 7dcdbabb3b [libc] add malloc funcs as external entrypoints
malloc, calloc, realloc, and free are all functions that other libc
functions depend on, but are pulled from external sources, instead of
having an internal implementation. This patch adds a way to include
functions like that as entrypoints in the list of external entrypoints,
and includes the malloc functions using this new path.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D112104
2021-10-27 10:21:01 -07:00
Michael Jones 87c016078a [libc] add atof, strtof and strtod
Add the string to floating point conversion functions.
Long doubles aren't supported yet, but floats and doubles are. The
primary algorithm used is the Eisel-Lemire ParseNumberF64 algorithm,
with the Simple Decimal Conversion algorithm as backup.

Links for more information on the algorithms:

Number Parsing at a Gigabyte per Second, Software: Practice and
Experience 51 (8), 2021 (https://arxiv.org/abs/2101.11408)
https://nigeltao.github.io/blog/2020/eisel-lemire.html
https://nigeltao.github.io/blog/2020/parse-number-f64-simple.html

Differential Revision: https://reviews.llvm.org/D109261
2021-10-18 16:10:03 -07:00
Michael Jones db8a88fef8 [libc] add memccpy and mempcpy
Add an implementation for memccpy and mempcpy. These functions are
posix extensions for the moment.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D111762
2021-10-14 16:38:00 -07:00
Michael Jones 9e9803bf82 [libc] Add strncat and fix strcat
This adds strncat to llvm libc. In addition, an error was found with
strcat and that was fixed.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D111583
2021-10-12 18:18:18 +00:00
Siva Chandra Reddy 5c3c716bb1 [libc] Add FE_DFL_ENV and handle it in fesetenv.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D110611
2021-09-28 18:09:52 +00:00
Siva Chandra Reddy 5eb6b82729 [libc] Add an implementation of qsort.
A fuzzer for qsort has also been added.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D110382
2021-09-24 19:22:45 +00:00
Siva Chandra Reddy 32a5007865 [libc] Add an implementation of bsearch.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D110222
2021-09-22 16:37:03 +00:00
Siva Chandra Reddy 74670e79b0 [libc] Add implementations of div, ldiv, lldiv and imaxdiv.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D109952
2021-09-20 04:51:42 +00:00
Siva Chandra Reddy 0da5ac1a75 [libc] Add extension functions fedisableexcept, feenableexcept and fegetexcept.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D109613
2021-09-10 18:44:53 +00:00
Siva Chandra Reddy 2bf8be79b1 [libc][NFC] Add fenv and string headers to x86_64 headers list. 2021-09-07 21:06:39 +00:00
Siva Chandra Reddy 2f4f452f16 [libc] Add a skeleton for C standard condition variable functions.
This patch adds a skeleton as a preparatory step for the next patch which
adds the actual implementations of the condition variable functions.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D108947
2021-09-01 19:41:52 +00:00