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[compiler-rt] Support FreeBSD standalone (boot) environment

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FreeBSD uses -Ddouble=jagged-little-pill -Dfloat=floaty-mcfloatface to
poison uses of floating point in its standalone environment. It also
deprecates machine/limits.h in favour of sys/limits.h and does not even
provide the former on newer architectures.

This is a cleaner reimplementation of equivalent patches in FreeBSD's
vendored copy of compiler-rt.

Reviewed By: dim

Differential Revision: https://reviews.llvm.org/D95264
This commit is contained in:
Jessica Clarke 2021-01-27 15:28:59 +00:00
parent 5386aa2627
commit add98b2462
2 changed files with 22 additions and 1 deletions
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11
compiler-rt/lib/builtins/int_lib.h
View file

@ -70,12 +70,21 @@
#error Unsupported target
#endif
#if defined(__NetBSD__) && (defined(_KERNEL) || defined(_STANDALONE))
#if (defined(__FreeBSD__) || defined(__NetBSD__)) && \
(defined(_KERNEL) || defined(_STANDALONE))
//
// Kernel and boot environment can't use normal headers,
// so use the equivalent system headers.
// NB: FreeBSD (and OpenBSD) deprecate machine/limits.h in
// favour of sys/limits.h, so prefer the former, but fall
// back on the latter if not available since NetBSD only has
// the latter.
//
#if defined(__has_include) && __has_include(<sys/limits.h>)
#include <sys/limits.h>
#else
#include <machine/limits.h>
#endif
#include <sys/stdint.h>
#include <sys/types.h>
#else

12
compiler-rt/lib/builtins/int_types.h
View file

@ -121,6 +121,15 @@ static __inline tu_int make_tu(du_int h, du_int l) {
#endif // CRT_HAS_128BIT
// FreeBSD's boot environment does not support using floating-point and poisons
// the float and double keywords.
#if defined(__FreeBSD__) && defined(_STANDALONE)
#define CRT_HAS_FLOATING_POINT 0
#else
#define CRT_HAS_FLOATING_POINT 1
#endif
#if CRT_HAS_FLOATING_POINT
typedef union {
su_int u;
float f;
@ -130,6 +139,7 @@ typedef union {
udwords u;
double f;
} double_bits;
#endif
typedef struct {
#if _YUGA_LITTLE_ENDIAN
@ -155,6 +165,7 @@ typedef struct {
#define HAS_80_BIT_LONG_DOUBLE 0
#endif
#if CRT_HAS_FLOATING_POINT
typedef union {
uqwords u;
long double f;
@ -183,4 +194,5 @@ typedef struct {
#define COMPLEX_REAL(x) (x).real
#define COMPLEX_IMAGINARY(x) (x).imaginary
#endif
#endif
#endif // INT_TYPES_H