Add dontthrow attribute to most libc functions

This will help C++ code that uses exceptions to be tinier. For example,
this change shaves away 1000 lines of assembly code from LLVM's libcxx,
which is 0.7% of all assembly instructions in the entire library.

libc/str/highwayhash64.h

@@ -2,7 +2,7 @@
 #define COSMOPOLITAN_LIBC_STR_HIGHWAYHASH64_H_
 COSMOPOLITAN_C_START_
 
-uint64_t HighwayHash64(const void *, size_t, const uint64_t[4]);
+uint64_t HighwayHash64(const void *, size_t, const uint64_t[4]) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_STR_HIGHWAYHASH64_H_ */

libc/str/locale.h

@@ -40,48 +40,48 @@ extern const struct __locale_map __c_dot_utf8;
 extern const struct __locale_struct __c_locale;
 extern const struct __locale_struct __c_dot_utf8_locale;
 
-char *nl_langinfo_l(int, locale_t);
-char *setlocale(int, const char *);
-double strtod_l(const char *, char **, locale_t);
-double wcstod_l(const wchar_t *, wchar_t **, locale_t);
-float strtof_l(const char *, char **, locale_t);
-float wcstof_l(const wchar_t *, wchar_t **, locale_t);
-int isdigit_l(int, locale_t);
-int islower_l(int, locale_t);
-int isupper_l(int, locale_t);
-int iswalpha_l(wint_t, locale_t);
-int iswblank_l(wint_t, locale_t);
-int iswcntrl_l(wint_t, locale_t);
-int iswdigit_l(wint_t, locale_t);
-int iswlower_l(wint_t, locale_t);
-int iswprint_l(wint_t, locale_t);
-int iswpunct_l(wint_t, locale_t);
-int iswspace_l(wint_t, locale_t);
-int iswupper_l(wint_t, locale_t);
-int iswxdigit_l(wint_t, locale_t);
-int isxdigit_l(int, locale_t);
-int strcoll_l(const char *, const char *, locale_t);
-int tolower_l(int, locale_t);
-int toupper_l(int, locale_t);
-int wcscoll_l(const wchar_t *, const wchar_t *, locale_t);
-locale_t duplocale(locale_t);
-locale_t newlocale(int, const char *, locale_t);
-locale_t uselocale(locale_t);
-long double strtold_l(const char *, char **, locale_t);
-long double wcstold_l(const wchar_t *, wchar_t **, locale_t);
-long long strtoll_l(const char *, char **, int, locale_t);
-long long wcstoll_l(const wchar_t *, wchar_t **, int, locale_t);
+char *nl_langinfo_l(int, locale_t) libcesque;
+char *setlocale(int, const char *) libcesque;
+double strtod_l(const char *, char **, locale_t) libcesque;
+double wcstod_l(const wchar_t *, wchar_t **, locale_t) libcesque;
+float strtof_l(const char *, char **, locale_t) libcesque;
+float wcstof_l(const wchar_t *, wchar_t **, locale_t) libcesque;
+int isdigit_l(int, locale_t) libcesque;
+int islower_l(int, locale_t) libcesque;
+int isupper_l(int, locale_t) libcesque;
+int iswalpha_l(wint_t, locale_t) libcesque;
+int iswblank_l(wint_t, locale_t) libcesque;
+int iswcntrl_l(wint_t, locale_t) libcesque;
+int iswdigit_l(wint_t, locale_t) libcesque;
+int iswlower_l(wint_t, locale_t) libcesque;
+int iswprint_l(wint_t, locale_t) libcesque;
+int iswpunct_l(wint_t, locale_t) libcesque;
+int iswspace_l(wint_t, locale_t) libcesque;
+int iswupper_l(wint_t, locale_t) libcesque;
+int iswxdigit_l(wint_t, locale_t) libcesque;
+int isxdigit_l(int, locale_t) libcesque;
+int strcoll_l(const char *, const char *, locale_t) libcesque;
+int tolower_l(int, locale_t) libcesque;
+int toupper_l(int, locale_t) libcesque;
+int wcscoll_l(const wchar_t *, const wchar_t *, locale_t) libcesque;
+locale_t duplocale(locale_t) libcesque;
+locale_t newlocale(int, const char *, locale_t) libcesque;
+locale_t uselocale(locale_t) libcesque;
+long double strtold_l(const char *, char **, locale_t) libcesque;
+long double wcstold_l(const wchar_t *, wchar_t **, locale_t) libcesque;
+long long strtoll_l(const char *, char **, int, locale_t) libcesque;
+long long wcstoll_l(const wchar_t *, wchar_t **, int, locale_t) libcesque;
 size_t strftime_l(char *, size_t, char const *, struct tm const *, locale_t);
-size_t strxfrm_l(char *, const char *, size_t, locale_t);
-size_t wcsxfrm_l(wchar_t *, const wchar_t *, size_t, locale_t);
-unsigned long long strtoull_l(const char *, char **, int, locale_t);
+size_t strxfrm_l(char *, const char *, size_t, locale_t) libcesque;
+size_t wcsxfrm_l(wchar_t *, const wchar_t *, size_t, locale_t) libcesque;
+unsigned long long strtoull_l(const char *, char **, int, locale_t) libcesque;
 unsigned long long wcstoull_l(const wchar_t *, wchar_t **, int, locale_t);
-void freelocale(locale_t);
-wint_t towlower_l(wint_t, locale_t);
-wint_t towupper_l(wint_t, locale_t);
-int strcasecmp_l(const char *, const char *, locale_t);
-int strncasecmp_l(const char *, const char *, size_t, locale_t);
-ssize_t strfmon_l(char *, size_t, locale_t, const char *, ...);
+void freelocale(locale_t) libcesque;
+wint_t towlower_l(wint_t, locale_t) libcesque;
+wint_t towupper_l(wint_t, locale_t) libcesque;
+int strcasecmp_l(const char *, const char *, locale_t) libcesque;
+int strncasecmp_l(const char *, const char *, size_t, locale_t) libcesque;
+ssize_t strfmon_l(char *, size_t, locale_t, const char *, ...) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_STR_LOCALE_H_ */

libc/str/nltypes.h

@@ -9,9 +9,9 @@ COSMOPOLITAN_C_START_
 typedef int nl_item;
 typedef void *nl_catd;
 
-nl_catd catopen(const char *, int);
-char *catgets(nl_catd, int, int, const char *);
-int catclose(nl_catd);
+nl_catd catopen(const char *, int) libcesque;
+char *catgets(nl_catd, int, int, const char *) libcesque;
+int catclose(nl_catd) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_STR_NLTYPES_H_ */

libc/str/slice.h

@@ -16,8 +16,8 @@ COSMOPOLITAN_C_START_
     __n == (m) && !memcasecmp(a, b, __n); \
   })
 
-int CompareSlices(const char *, size_t, const char *, size_t);
-int CompareSlicesCase(const char *, size_t, const char *, size_t);
+int CompareSlices(const char *, size_t, const char *, size_t) libcesque;
+int CompareSlicesCase(const char *, size_t, const char *, size_t) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_STR_SLICE_H_ */

libc/str/str.h

@@ -23,38 +23,38 @@
 #if !(__ASSEMBLER__ + __LINKER__ + 0)
 COSMOPOLITAN_C_START_
 
-int isascii(int);
-int isspace(int);
-int isalpha(int);
-int isdigit(int);
-int isalnum(int);
-int isxdigit(int);
-int isprint(int);
-int islower(int);
-int isupper(int);
-int isblank(int);
-int iscntrl(int);
-int isgraph(int);
-int tolower(int);
-int ispunct(int);
-int toupper(int);
-int toascii(int);
+int isascii(int) libcesque;
+int isspace(int) libcesque;
+int isalpha(int) libcesque;
+int isdigit(int) libcesque;
+int isalnum(int) libcesque;
+int isxdigit(int) libcesque;
+int isprint(int) libcesque;
+int islower(int) libcesque;
+int isupper(int) libcesque;
+int isblank(int) libcesque;
+int iscntrl(int) libcesque;
+int isgraph(int) libcesque;
+int tolower(int) libcesque;
+int ispunct(int) libcesque;
+int toupper(int) libcesque;
+int toascii(int) libcesque;
 
-int iswalnum(wint_t);
-int iswalpha(wint_t);
-int iswblank(wint_t);
-int iswcntrl(wint_t);
-int iswdigit(wint_t);
-int iswgraph(wint_t);
-int iswlower(wint_t);
-int iswspace(wint_t);
-int iswupper(wint_t);
-int iswxdigit(wint_t);
-int iswpunct(wint_t);
-int iswprint(wint_t);
-int iswseparator(wint_t);
-wint_t towlower(wint_t);
-wint_t towupper(wint_t);
+int iswalnum(wint_t) libcesque;
+int iswalpha(wint_t) libcesque;
+int iswblank(wint_t) libcesque;
+int iswcntrl(wint_t) libcesque;
+int iswdigit(wint_t) libcesque;
+int iswgraph(wint_t) libcesque;
+int iswlower(wint_t) libcesque;
+int iswspace(wint_t) libcesque;
+int iswupper(wint_t) libcesque;
+int iswxdigit(wint_t) libcesque;
+int iswpunct(wint_t) libcesque;
+int iswprint(wint_t) libcesque;
+int iswseparator(wint_t) libcesque;
+wint_t towlower(wint_t) libcesque;
+wint_t towupper(wint_t) libcesque;
 
 void *memset(void *, int, size_t) memcpyesque;
 void *memmove(void *, const void *, size_t) memcpyesque;
@@ -65,19 +65,19 @@ void *memccpy(void *restrict, const void *restrict, int, size_t) memcpyesque;
 void explicit_bzero(void *, size_t);
 
 int memcmp(const void *, const void *, size_t) strlenesque;
-int timingsafe_bcmp(const void *, const void *, size_t);
-int timingsafe_memcmp(const void *, const void *, size_t);
+int timingsafe_bcmp(const void *, const void *, size_t) libcesque;
+int timingsafe_memcmp(const void *, const void *, size_t) libcesque;
 
 size_t strlen(const char *) strlenesque;
 size_t strnlen(const char *, size_t) strlenesque;
-size_t strnlen_s(const char *, size_t);
+size_t strnlen_s(const char *, size_t) libcesque;
 char *strchr(const char *, int) strlenesque;
 void *memchr(const void *, int, size_t) strlenesque;
 char *strchrnul(const char *, int) strlenesque returnsnonnull;
 void *rawmemchr(const void *, int) strlenesque returnsnonnull;
 size_t wcslen(const wchar_t *) strlenesque;
 size_t wcsnlen(const wchar_t *, size_t) strlenesque;
-size_t wcsnlen_s(const wchar_t *, size_t);
+size_t wcsnlen_s(const wchar_t *, size_t) libcesque;
 wchar_t *wcschr(const wchar_t *, wchar_t) strlenesque;
 wchar_t *wmemchr(const wchar_t *, wchar_t, size_t) strlenesque;
 wchar_t *wcschrnul(const wchar_t *, wchar_t)
@@ -107,14 +107,14 @@ size_t strcspn(const char *, const char *) strlenesque;
 size_t wcscspn(const wchar_t *, const wchar_t *) strlenesque;
 void *memfrob(void *, size_t) memcpyesque;
 int strcoll(const char *, const char *) strlenesque;
-char *strsep(char **, const char *) paramsnonnull();
+char *strsep(char **, const char *) libcesque paramsnonnull();
 char *stpcpy(char *, const char *) memcpyesque;
 char *stpncpy(char *, const char *, size_t) memcpyesque;
 char *strcat(char *, const char *) memcpyesque;
 wchar_t *wcscat(wchar_t *, const wchar_t *) memcpyesque;
-size_t strlcpy(char *, const char *, size_t);
-size_t strlcat(char *, const char *, size_t);
-size_t strxfrm(char *, const char *, size_t);
+size_t strlcpy(char *, const char *, size_t) libcesque;
+size_t strlcat(char *, const char *, size_t) libcesque;
+size_t strxfrm(char *, const char *, size_t) libcesque;
 char *strcpy(char *, const char *) memcpyesque;
 wchar_t *wcscpy(wchar_t *, const wchar_t *) memcpyesque;
 char *strncat(char *, const char *, size_t) memcpyesque;
@@ -123,56 +123,56 @@ char *strncpy(char *, const char *, size_t) memcpyesque;
 char *strtok(char *, const char *) paramsnonnull((2)) libcesque;
 char *strtok_r(char *, const char *, char **) paramsnonnull((2, 3));
 wchar_t *wcstok(wchar_t *, const wchar_t *, wchar_t **) paramsnonnull((2, 3));
-int strverscmp(const char *, const char *);
+int strverscmp(const char *, const char *) libcesque;
 wchar_t *wmemset(wchar_t *, wchar_t, size_t) memcpyesque;
 wchar_t *wmemcpy(wchar_t *, const wchar_t *, size_t) memcpyesque;
 wchar_t *wmempcpy(wchar_t *, const wchar_t *, size_t) memcpyesque;
 wchar_t *wmemmove(wchar_t *, const wchar_t *, size_t) memcpyesque;
 void *memmem(const void *, size_t, const void *, size_t)
 libcesque nosideeffect;
-ssize_t strfmon(char *, size_t, const char *, ...);
-long a64l(const char *);
-char *l64a(long);
+ssize_t strfmon(char *, size_t, const char *, ...) libcesque;
+long a64l(const char *) libcesque;
+char *l64a(long) libcesque;
 
 typedef unsigned mbstate_t;
 
-wchar_t *wcsncpy(wchar_t *, const wchar_t *, size_t);
-int mbtowc(wchar_t *, const char *, size_t);
-size_t mbrtowc(wchar_t *, const char *, size_t, mbstate_t *);
-size_t mbsrtowcs(wchar_t *, const char **, size_t, mbstate_t *);
-size_t mbstowcs(wchar_t *, const char *, size_t);
-size_t wcrtomb(char *, wchar_t, mbstate_t *);
-size_t c32rtomb(char *, char32_t, mbstate_t *);
-size_t mbrtoc32(char32_t *, const char *, size_t, mbstate_t *);
-size_t c16rtomb(char *, char16_t, mbstate_t *);
-size_t mbrtoc16(char16_t *, const char *, size_t, mbstate_t *);
-size_t mbrlen(const char *, size_t, mbstate_t *);
+wchar_t *wcsncpy(wchar_t *, const wchar_t *, size_t) libcesque;
+int mbtowc(wchar_t *, const char *, size_t) libcesque;
+size_t mbrtowc(wchar_t *, const char *, size_t, mbstate_t *) libcesque;
+size_t mbsrtowcs(wchar_t *, const char **, size_t, mbstate_t *) libcesque;
+size_t mbstowcs(wchar_t *, const char *, size_t) libcesque;
+size_t wcrtomb(char *, wchar_t, mbstate_t *) libcesque;
+size_t c32rtomb(char *, char32_t, mbstate_t *) libcesque;
+size_t mbrtoc32(char32_t *, const char *, size_t, mbstate_t *) libcesque;
+size_t c16rtomb(char *, char16_t, mbstate_t *) libcesque;
+size_t mbrtoc16(char16_t *, const char *, size_t, mbstate_t *) libcesque;
+size_t mbrlen(const char *, size_t, mbstate_t *) libcesque;
 size_t mbsnrtowcs(wchar_t *, const char **, size_t, size_t, mbstate_t *);
 size_t wcsnrtombs(char *, const wchar_t **, size_t, size_t, mbstate_t *);
-size_t wcsrtombs(char *, const wchar_t **, size_t, mbstate_t *);
-size_t wcstombs(char *, const wchar_t *, size_t);
-int mbsinit(const mbstate_t *);
-int mblen(const char *, size_t);
-int wctomb(char *, wchar_t);
-int wctob(wint_t);
-wint_t btowc(int);
+size_t wcsrtombs(char *, const wchar_t **, size_t, mbstate_t *) libcesque;
+size_t wcstombs(char *, const wchar_t *, size_t) libcesque;
+int mbsinit(const mbstate_t *) libcesque;
+int mblen(const char *, size_t) libcesque;
+int wctomb(char *, wchar_t) libcesque;
+int wctob(wint_t) libcesque;
+wint_t btowc(int) libcesque;
 
 typedef unsigned wctype_t;
 wctype_t wctype(const char *) strlenesque;
-int iswctype(wint_t, wctype_t) pureconst;
+pureconst int iswctype(wint_t, wctype_t) libcesque;
 
 typedef const int *wctrans_t;
-wctrans_t wctrans(const char *);
-wint_t towctrans(wint_t, wctrans_t);
+wctrans_t wctrans(const char *) libcesque;
+wint_t towctrans(wint_t, wctrans_t) libcesque;
 
-int getsubopt(char **, char *const *, char **) paramsnonnull();
+int getsubopt(char **, char *const *, char **) libcesque paramsnonnull();
 char *strsignal(int) returnsnonnull libcesque;
 char *strerror(int) returnsnonnull dontthrow nocallback;
 errno_t strerror_r(int, char *, size_t) libcesque;
 char *__xpg_strerror_r(int, char *, size_t) libcesque;
 
 #ifdef _COSMO_SOURCE
-uint64_t tpenc(uint32_t) pureconst;
+pureconst uint64_t tpenc(uint32_t) libcesque;
 char *chomp(char *) libcesque;
 wchar_t *wchomp(wchar_t *) libcesque;
 uint64_t __fnv(const void *, size_t) strlenesque;
@@ -205,11 +205,11 @@ char16_t *strncat16(char16_t *, const char16_t *, size_t) memcpyesque;
 char16_t *memset16(char16_t *, char16_t, size_t) memcpyesque;
 bool32 startswith16(const char16_t *, const char16_t *) strlenesque;
 bool32 endswith16(const char16_t *, const char16_t *) strlenesque;
-axdx_t tprecode8to16(char16_t *, size_t, const char *);
-axdx_t tprecode16to8(char *, size_t, const char16_t *);
+axdx_t tprecode8to16(char16_t *, size_t, const char *) libcesque;
+axdx_t tprecode16to8(char *, size_t, const char16_t *) libcesque;
 bool32 wcsstartswith(const wchar_t *, const wchar_t *) strlenesque;
 bool32 wcsendswith(const wchar_t *, const wchar_t *) strlenesque;
-char *__join_paths(char *, size_t, const char *, const char *) __wur;
+char *__join_paths(char *, size_t, const char *, const char *) libcesque __wur;
 int __mkntpathat(int, const char *, int, char16_t[hasatleast 1024]);
 #endif /* _COSMO_SOURCE */
 

libc/str/unicode.h

@@ -29,9 +29,9 @@ struct lconv {
   char int_n_sign_posn;
 };
 
-int wcwidth(wchar_t) pureconst;
+pureconst int wcwidth(wchar_t) libcesque;
 int wcswidth(const wchar_t *, size_t) strlenesque;
-struct lconv *localeconv(void);
+struct lconv *localeconv(void) libcesque;
 
 #ifdef _COSMO_SOURCE
 int wcsnwidth(const wchar_t *, size_t, size_t) strlenesque;