[libc-commits] [libc] [clang] [llvm] [Libc] Give more functions restrict qualifiers (PR #78061)
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Mon Jan 15 07:17:09 PST 2024
https://github.com/AtariDreams updated https://github.com/llvm/llvm-project/pull/78061
>From d11eeea09dffc9692534023f071e2779ce452997 Mon Sep 17 00:00:00 2001
From: Rose <83477269+AtariDreams at users.noreply.github.com>
Date: Sat, 13 Jan 2024 14:09:17 -0500
Subject: [PATCH] [Libc] Give more functions restrict qualifiers
strsep, strtok_r, strlcpy, and strlcat take restricted pointers as parameters.
Add the restrict qualifiers to them.
Sources:
https://man7.org/linux/man-pages/man3/strsep.3.html
https://man7.org/linux/man-pages/man3/strtok_r.3.html
https://man.freebsd.org/cgi/man.cgi?strlcpy
---
clang/lib/Headers/llvm_libc_wrappers/string.h | 4 +-
...ystem-header-simulator-for-simple-stream.h | 4 +-
.../Analysis/Inputs/system-header-simulator.h | 6 +--
clang/test/Analysis/bsd-string.c | 4 +-
clang/test/Analysis/string.c | 4 +-
libc/spec/bsd_ext.td | 4 +-
libc/src/string/strsep.cpp | 3 +-
libc/src/string/strsep.h | 2 +-
llvm/lib/Support/regex_impl.h | 3 +-
llvm/lib/Support/regstrlcpy.c | 41 +++++++++----------
10 files changed, 38 insertions(+), 37 deletions(-)
diff --git a/clang/lib/Headers/llvm_libc_wrappers/string.h b/clang/lib/Headers/llvm_libc_wrappers/string.h
index b4fbf17c7e421f7..0ea49cb137606c7 100644
--- a/clang/lib/Headers/llvm_libc_wrappers/string.h
+++ b/clang/lib/Headers/llvm_libc_wrappers/string.h
@@ -51,13 +51,13 @@ char *strcpy(char *__restrict, const char *__restrict) __LIBC_ATTRS;
size_t strcspn(const char *, const char *) __LIBC_ATTRS;
char *strdup(const char *) __LIBC_ATTRS;
size_t strlen(const char *) __LIBC_ATTRS;
-char *strncat(char *, const char *, size_t) __LIBC_ATTRS;
+char *strncat(char *__restrict, const char *__restrict, size_t) __LIBC_ATTRS;
int strncmp(const char *, const char *, size_t) __LIBC_ATTRS;
char *strncpy(char *__restrict, const char *__restrict, size_t) __LIBC_ATTRS;
char *strndup(const char *, size_t) __LIBC_ATTRS;
size_t strnlen(const char *, size_t) __LIBC_ATTRS;
size_t strspn(const char *, const char *) __LIBC_ATTRS;
-char *strtok(char *__restrict, const char *) __LIBC_ATTRS;
+char *strtok(char *__restrict, const char *__restrict) __LIBC_ATTRS;
char *strtok_r(char *__restrict, const char *__restrict,
char **__restrict) __LIBC_ATTRS;
size_t strxfrm(char *__restrict, const char *__restrict, size_t) __LIBC_ATTRS;
diff --git a/clang/test/Analysis/Inputs/system-header-simulator-for-simple-stream.h b/clang/test/Analysis/Inputs/system-header-simulator-for-simple-stream.h
index b65b7a6b0e7b020..098a2208fecbe91 100644
--- a/clang/test/Analysis/Inputs/system-header-simulator-for-simple-stream.h
+++ b/clang/test/Analysis/Inputs/system-header-simulator-for-simple-stream.h
@@ -8,9 +8,9 @@
typedef struct __sFILE {
unsigned char *_p;
} FILE;
-FILE *fopen(const char * restrict, const char * restrict) __asm("_" "fopen" );
+FILE *fopen(const char *restrict, const char *restrict) __asm("_" "fopen" );
int fputc(int, FILE *);
-int fputs(const char * restrict, FILE * restrict) __asm("_" "fputs" );
+int fputs(const char *restrict, FILE *restrict) __asm("_" "fputs" );
int fclose(FILE *);
void exit(int);
diff --git a/clang/test/Analysis/Inputs/system-header-simulator.h b/clang/test/Analysis/Inputs/system-header-simulator.h
index cd7ac616bcc67fa..f8e3e546a7aed5e 100644
--- a/clang/test/Analysis/Inputs/system-header-simulator.h
+++ b/clang/test/Analysis/Inputs/system-header-simulator.h
@@ -71,9 +71,9 @@ int fflush(FILE *stream);
size_t strlen(const char *);
char *strcpy(char *restrict, const char *restrict);
-char *strncpy(char *dst, const char *src, size_t n);
-char *strsep(char **stringp, const char *delim);
-void *memcpy(void *dst, const void *src, size_t n);
+char *strncpy(char *restrict dst, const char *restrict src, size_t n);
+char *strsep(char **restrict stringp, const char *restrict delim);
+void *memcpy(void *restrict dst, const void *restrict src, size_t n);
void *memset(void *s, int c, size_t n);
typedef unsigned long __darwin_pthread_key_t;
diff --git a/clang/test/Analysis/bsd-string.c b/clang/test/Analysis/bsd-string.c
index 1c7b28198dff269..ad5fee7da914bdc 100644
--- a/clang/test/Analysis/bsd-string.c
+++ b/clang/test/Analysis/bsd-string.c
@@ -7,8 +7,8 @@
#define NULL ((void *)0)
typedef __typeof(sizeof(int)) size_t;
-size_t strlcpy(char *dst, const char *src, size_t n);
-size_t strlcat(char *dst, const char *src, size_t n);
+size_t strlcpy(char * restrict dst, const char * restrict src, size_t n);
+size_t strlcat(char *restrict dst, const char *restrict src, size_t n);
size_t strlen(const char *s);
void clang_analyzer_eval(int);
diff --git a/clang/test/Analysis/string.c b/clang/test/Analysis/string.c
index d47de9db8228e57..85232624160c062 100644
--- a/clang/test/Analysis/string.c
+++ b/clang/test/Analysis/string.c
@@ -71,7 +71,7 @@ void clang_analyzer_eval(int);
int scanf(const char *restrict format, ...);
void *malloc(size_t);
void free(void *);
-void *memcpy(void *dest, const void *src, size_t n);
+void *memcpy(void *restrict dest, const void *restrict src, size_t n);
//===----------------------------------------------------------------------===
// strlen()
@@ -1252,7 +1252,7 @@ int strncasecmp_null_argument(char *a, size_t n) {
// strsep()
//===----------------------------------------------------------------------===
-char *strsep(char **stringp, const char *delim);
+char *strsep(char ** restrict stringp, const char * restrict delim);
void strsep_null_delim(char *s) {
strsep(&s, NULL); // expected-warning{{Null pointer passed as 2nd argument to strsep()}}
diff --git a/libc/spec/bsd_ext.td b/libc/spec/bsd_ext.td
index 3829e57e9765a96..c52d5bf10c80a88 100644
--- a/libc/spec/bsd_ext.td
+++ b/libc/spec/bsd_ext.td
@@ -8,12 +8,12 @@ def BsdExtensions : StandardSpec<"BSDExtensions"> {
FunctionSpec<
"strlcat",
RetValSpec<SizeTType>,
- [ArgSpec<CharPtr>, ArgSpec<ConstCharPtr>, ArgSpec<SizeTType>]
+ [ArgSpec<ConstCharRestrictedPtr>, ArgSpec<ConstCharRestrictedPtr>, ArgSpec<SizeTType>]
>,
FunctionSpec<
"strlcpy",
RetValSpec<SizeTType>,
- [ArgSpec<CharPtr>, ArgSpec<ConstCharPtr>, ArgSpec<SizeTType>]
+ [ArgSpec<ConstCharRestrictedPtr>, ArgSpec<ConstCharRestrictedPtr>, ArgSpec<SizeTType>]
>,
FunctionSpec<
"strsep",
diff --git a/libc/src/string/strsep.cpp b/libc/src/string/strsep.cpp
index edd2cf07e20a450..5ebf2550744c304 100644
--- a/libc/src/string/strsep.cpp
+++ b/libc/src/string/strsep.cpp
@@ -12,7 +12,8 @@
namespace LIBC_NAMESPACE {
-LLVM_LIBC_FUNCTION(char *, strsep, (char **stringp, const char *delim)) {
+LLVM_LIBC_FUNCTION(char *, strsep,
+ (char **__restrict stringp, const char *__restrict delim)) {
if (!*stringp)
return nullptr;
return internal::string_token<false>(*stringp, delim, stringp);
diff --git a/libc/src/string/strsep.h b/libc/src/string/strsep.h
index 48f55a899d7f336..7b85202d30b2b9d 100644
--- a/libc/src/string/strsep.h
+++ b/libc/src/string/strsep.h
@@ -11,7 +11,7 @@
namespace LIBC_NAMESPACE {
-char *strsep(char **stringp, const char *delim);
+char *strsep(char **__restrict stringp, const char *__restrict delim);
} // namespace LIBC_NAMESPACE
diff --git a/llvm/lib/Support/regex_impl.h b/llvm/lib/Support/regex_impl.h
index 8f0c532205edc3e..1d98964b9f40e2e 100644
--- a/llvm/lib/Support/regex_impl.h
+++ b/llvm/lib/Support/regex_impl.h
@@ -99,7 +99,8 @@ size_t llvm_regerror(int, const llvm_regex_t *, char *, size_t);
int llvm_regexec(const llvm_regex_t *, const char *, size_t,
llvm_regmatch_t [], int);
void llvm_regfree(llvm_regex_t *);
-size_t llvm_strlcpy(char *dst, const char *src, size_t siz);
+size_t llvm_strlcpy(char *__restrict dst, const char *__restrict src,
+ size_t siz);
#ifdef __cplusplus
}
diff --git a/llvm/lib/Support/regstrlcpy.c b/llvm/lib/Support/regstrlcpy.c
index 8b68afdf75f16af..0f3b5e65172cf33 100644
--- a/llvm/lib/Support/regstrlcpy.c
+++ b/llvm/lib/Support/regstrlcpy.c
@@ -25,28 +25,27 @@
* will be copied. Always NUL terminates (unless siz == 0).
* Returns strlen(src); if retval >= siz, truncation occurred.
*/
-size_t
-llvm_strlcpy(char *dst, const char *src, size_t siz)
-{
- char *d = dst;
- const char *s = src;
- size_t n = siz;
+size_t llvm_strlcpy(char *__restrict dst, const char *__restrict src,
+ size_t siz) {
+ char *d = dst;
+ const char *s = src;
+ size_t n = siz;
- /* Copy as many bytes as will fit */
- if (n != 0) {
- while (--n != 0) {
- if ((*d++ = *s++) == '\0')
- break;
- }
- }
+ /* Copy as many bytes as will fit */
+ if (n != 0) {
+ while (--n != 0) {
+ if ((*d++ = *s++) == '\0')
+ break;
+ }
+ }
- /* Not enough room in dst, add NUL and traverse rest of src */
- if (n == 0) {
- if (siz != 0)
- *d = '\0'; /* NUL-terminate dst */
- while (*s++)
- ;
- }
+ /* Not enough room in dst, add NUL and traverse rest of src */
+ if (n == 0) {
+ if (siz != 0)
+ *d = '\0'; /* NUL-terminate dst */
+ while (*s++)
+ ;
+ }
- return(s - src - 1); /* count does not include NUL */
+ return (s - src - 1); /* count does not include NUL */
}
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