From: Richard Biener Date: Wed, 23 Nov 2016 10:52:25 +0000 (+0000) Subject: re PR tree-optimization/78154 (memcpy et al can be assumed to return non-null) X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a5bb8a5ceae1bfb0fa82a58254a6539c8943d4b8;p=gcc.git re PR tree-optimization/78154 (memcpy et al can be assumed to return non-null) 2016-11-23 Richard Biener Prathamesh Kulkarni PR tree-optimization/78154 * tree-vrp.c (gimple_stmt_nonzero_warnv_p): Return true if function returns it's argument and the argument is nonnull. * builtin-attrs.def: Define ATTR_RETURNS_NONNULL, ATT_RETNONNULL_NOTHROW_LEAF. * builtins.def (BUILT_IN_MEMPCPY): Change attribute to ATTR_RETNONNULL_NOTHROW_LEAF. (BUILT_IN_STPCPY): Likewise. (BUILT_IN_STPNCPY): Likewise. (BUILT_IN_MEMPCPY_CHK): Likewise. (BUILT_IN_STPCPY_CHK): Likewise. (BUILT_IN_STPNCPY_CHK): Likewise. (BUILT_IN_STRCAT): Change attribute to ATTR_RET1_NOTHROW_NONNULL_LEAF. (BUILT_IN_STRNCAT): Likewise. (BUILT_IN_STRNCPY): Likewise. (BUILT_IN_MEMSET_CHK): Likewise. (BUILT_IN_STRCAT_CHK): Likewise. (BUILT_IN_STRCPY_CHK): Likewise. (BUILT_IN_STRNCAT_CHK): Likewise. (BUILT_IN_STRNCPY_CHK): Likewise. testsuite/ * gcc.dg/tree-ssa/pr78154.c: New test. Co-Authored-By: Prathamesh Kulkarni From-SVN: r242745 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 30ab26a5e0b..7c7ff4c61be 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,27 @@ +2016-11-23 Richard Biener + Prathamesh Kulkarni + + PR tree-optimization/78154 + * tree-vrp.c (gimple_stmt_nonzero_warnv_p): Return true if function + returns it's argument and the argument is nonnull. + * builtin-attrs.def: Define ATTR_RETURNS_NONNULL, + ATT_RETNONNULL_NOTHROW_LEAF. + * builtins.def (BUILT_IN_MEMPCPY): Change attribute to + ATTR_RETNONNULL_NOTHROW_LEAF. + (BUILT_IN_STPCPY): Likewise. + (BUILT_IN_STPNCPY): Likewise. + (BUILT_IN_MEMPCPY_CHK): Likewise. + (BUILT_IN_STPCPY_CHK): Likewise. + (BUILT_IN_STPNCPY_CHK): Likewise. + (BUILT_IN_STRCAT): Change attribute to ATTR_RET1_NOTHROW_NONNULL_LEAF. + (BUILT_IN_STRNCAT): Likewise. + (BUILT_IN_STRNCPY): Likewise. + (BUILT_IN_MEMSET_CHK): Likewise. + (BUILT_IN_STRCAT_CHK): Likewise. + (BUILT_IN_STRCPY_CHK): Likewise. + (BUILT_IN_STRNCAT_CHK): Likewise. + (BUILT_IN_STRNCPY_CHK): Likewise. + 2016-11-23 Naveen H.S * fold-const.c (tree_expr_nonzero_p) : Make non-static. diff --git a/gcc/builtin-attrs.def b/gcc/builtin-attrs.def index 8dc59c9b726..88c9bd1f495 100644 --- a/gcc/builtin-attrs.def +++ b/gcc/builtin-attrs.def @@ -108,6 +108,7 @@ DEF_ATTR_IDENT (ATTR_TYPEGENERIC, "type generic") DEF_ATTR_IDENT (ATTR_TM_REGPARM, "*tm regparm") DEF_ATTR_IDENT (ATTR_TM_TMPURE, "transaction_pure") DEF_ATTR_IDENT (ATTR_RETURNS_TWICE, "returns_twice") +DEF_ATTR_IDENT (ATTR_RETURNS_NONNULL, "returns_nonnull") DEF_ATTR_TREE_LIST (ATTR_NOVOPS_LIST, ATTR_NOVOPS, ATTR_NULL, ATTR_NULL) @@ -197,6 +198,10 @@ DEF_ATTR_TREE_LIST (ATTR_CONST_NOTHROW_NONNULL, ATTR_CONST, ATTR_NULL, \ and which return their first argument. */ DEF_ATTR_TREE_LIST (ATTR_RET1_NOTHROW_NONNULL_LEAF, ATTR_FNSPEC, ATTR_LIST_STR1, \ ATTR_NOTHROW_NONNULL_LEAF) +/* Nothrow leaf functions whose pointer parameter(s) are all nonnull, + and return value is also nonnull. */ +DEF_ATTR_TREE_LIST (ATTR_RETNONNULL_NOTHROW_LEAF, ATTR_RETURNS_NONNULL, ATTR_NULL, \ + ATTR_NOTHROW_NONNULL_LEAF) /* Nothrow const leaf functions whose pointer parameter(s) are all nonnull. */ DEF_ATTR_TREE_LIST (ATTR_CONST_NOTHROW_NONNULL_LEAF, ATTR_CONST, ATTR_NULL, \ ATTR_NOTHROW_NONNULL_LEAF) diff --git a/gcc/builtins.def b/gcc/builtins.def index e2c582880c3..151836a797f 100644 --- a/gcc/builtins.def +++ b/gcc/builtins.def @@ -646,13 +646,13 @@ DEF_LIB_BUILTIN (BUILT_IN_MEMCHR, "memchr", BT_FN_PTR_CONST_PTR_INT_SIZE, DEF_LIB_BUILTIN (BUILT_IN_MEMCMP, "memcmp", BT_FN_INT_CONST_PTR_CONST_PTR_SIZE, ATTR_PURE_NOTHROW_NONNULL_LEAF) DEF_LIB_BUILTIN_CHKP (BUILT_IN_MEMCPY, "memcpy", BT_FN_PTR_PTR_CONST_PTR_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) DEF_LIB_BUILTIN_CHKP (BUILT_IN_MEMMOVE, "memmove", BT_FN_PTR_PTR_CONST_PTR_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_MEMPCPY, "mempcpy", BT_FN_PTR_PTR_CONST_PTR_SIZE, ATTR_NOTHROW_NONNULL_LEAF) +DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_MEMPCPY, "mempcpy", BT_FN_PTR_PTR_CONST_PTR_SIZE, ATTR_RETNONNULL_NOTHROW_LEAF) DEF_LIB_BUILTIN_CHKP (BUILT_IN_MEMSET, "memset", BT_FN_PTR_PTR_INT_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) DEF_EXT_LIB_BUILTIN (BUILT_IN_RINDEX, "rindex", BT_FN_STRING_CONST_STRING_INT, ATTR_PURE_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_STPCPY, "stpcpy", BT_FN_STRING_STRING_CONST_STRING, ATTR_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN (BUILT_IN_STPNCPY, "stpncpy", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_NOTHROW_NONNULL_LEAF) +DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_STPCPY, "stpcpy", BT_FN_STRING_STRING_CONST_STRING, ATTR_RETNONNULL_NOTHROW_LEAF) +DEF_EXT_LIB_BUILTIN (BUILT_IN_STPNCPY, "stpncpy", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_RETNONNULL_NOTHROW_LEAF) DEF_EXT_LIB_BUILTIN (BUILT_IN_STRCASECMP, "strcasecmp", BT_FN_INT_CONST_STRING_CONST_STRING, ATTR_PURE_NOTHROW_NONNULL_LEAF) -DEF_LIB_BUILTIN_CHKP (BUILT_IN_STRCAT, "strcat", BT_FN_STRING_STRING_CONST_STRING, ATTR_NOTHROW_NONNULL_LEAF) +DEF_LIB_BUILTIN_CHKP (BUILT_IN_STRCAT, "strcat", BT_FN_STRING_STRING_CONST_STRING, ATTR_RET1_NOTHROW_NONNULL_LEAF) DEF_LIB_BUILTIN_CHKP (BUILT_IN_STRCHR, "strchr", BT_FN_STRING_CONST_STRING_INT, ATTR_PURE_NOTHROW_NONNULL_LEAF) DEF_LIB_BUILTIN (BUILT_IN_STRCMP, "strcmp", BT_FN_INT_CONST_STRING_CONST_STRING, ATTR_PURE_NOTHROW_NONNULL_LEAF) DEF_LIB_BUILTIN_CHKP (BUILT_IN_STRCPY, "strcpy", BT_FN_STRING_STRING_CONST_STRING, ATTR_RET1_NOTHROW_NONNULL_LEAF) @@ -661,9 +661,9 @@ DEF_EXT_LIB_BUILTIN (BUILT_IN_STRDUP, "strdup", BT_FN_STRING_CONST_STRING, AT DEF_EXT_LIB_BUILTIN (BUILT_IN_STRNDUP, "strndup", BT_FN_STRING_CONST_STRING_SIZE, ATTR_MALLOC_NOTHROW_NONNULL_LEAF) DEF_LIB_BUILTIN_CHKP (BUILT_IN_STRLEN, "strlen", BT_FN_SIZE_CONST_STRING, ATTR_PURE_NOTHROW_NONNULL_LEAF) DEF_EXT_LIB_BUILTIN (BUILT_IN_STRNCASECMP, "strncasecmp", BT_FN_INT_CONST_STRING_CONST_STRING_SIZE, ATTR_PURE_NOTHROW_NONNULL_LEAF) -DEF_LIB_BUILTIN (BUILT_IN_STRNCAT, "strncat", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_NOTHROW_NONNULL_LEAF) +DEF_LIB_BUILTIN (BUILT_IN_STRNCAT, "strncat", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) DEF_LIB_BUILTIN (BUILT_IN_STRNCMP, "strncmp", BT_FN_INT_CONST_STRING_CONST_STRING_SIZE, ATTR_PURE_NOTHROW_NONNULL_LEAF) -DEF_LIB_BUILTIN (BUILT_IN_STRNCPY, "strncpy", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_NOTHROW_NONNULL_LEAF) +DEF_LIB_BUILTIN (BUILT_IN_STRNCPY, "strncpy", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) DEF_LIB_BUILTIN (BUILT_IN_STRPBRK, "strpbrk", BT_FN_STRING_CONST_STRING_CONST_STRING, ATTR_PURE_NOTHROW_NONNULL_LEAF) DEF_LIB_BUILTIN (BUILT_IN_STRRCHR, "strrchr", BT_FN_STRING_CONST_STRING_INT, ATTR_PURE_NOTHROW_NONNULL_LEAF) DEF_LIB_BUILTIN (BUILT_IN_STRSPN, "strspn", BT_FN_SIZE_CONST_STRING_CONST_STRING, ATTR_PURE_NOTHROW_NONNULL_LEAF) @@ -904,14 +904,14 @@ DEF_BUILTIN_STUB (BUILT_IN_MEMCMP_EQ, "__builtin_memcmp_eq") DEF_GCC_BUILTIN (BUILT_IN_OBJECT_SIZE, "object_size", BT_FN_SIZE_CONST_PTR_INT, ATTR_PURE_NOTHROW_LEAF_LIST) DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_MEMCPY_CHK, "__memcpy_chk", BT_FN_PTR_PTR_CONST_PTR_SIZE_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_MEMMOVE_CHK, "__memmove_chk", BT_FN_PTR_PTR_CONST_PTR_SIZE_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_MEMPCPY_CHK, "__mempcpy_chk", BT_FN_PTR_PTR_CONST_PTR_SIZE_SIZE, ATTR_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_MEMSET_CHK, "__memset_chk", BT_FN_PTR_PTR_INT_SIZE_SIZE, ATTR_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_STPCPY_CHK, "__stpcpy_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN (BUILT_IN_STPNCPY_CHK, "__stpncpy_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE_SIZE, ATTR_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_STRCAT_CHK, "__strcat_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_STRCPY_CHK, "__strcpy_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN (BUILT_IN_STRNCAT_CHK, "__strncat_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE_SIZE, ATTR_NOTHROW_NONNULL_LEAF) -DEF_EXT_LIB_BUILTIN (BUILT_IN_STRNCPY_CHK, "__strncpy_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE_SIZE, ATTR_NOTHROW_NONNULL_LEAF) +DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_MEMPCPY_CHK, "__mempcpy_chk", BT_FN_PTR_PTR_CONST_PTR_SIZE_SIZE, ATTR_RETNONNULL_NOTHROW_LEAF) +DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_MEMSET_CHK, "__memset_chk", BT_FN_PTR_PTR_INT_SIZE_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) +DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_STPCPY_CHK, "__stpcpy_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_RETNONNULL_NOTHROW_LEAF) +DEF_EXT_LIB_BUILTIN (BUILT_IN_STPNCPY_CHK, "__stpncpy_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE_SIZE, ATTR_RETNONNULL_NOTHROW_LEAF) +DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_STRCAT_CHK, "__strcat_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) +DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_STRCPY_CHK, "__strcpy_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) +DEF_EXT_LIB_BUILTIN (BUILT_IN_STRNCAT_CHK, "__strncat_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) +DEF_EXT_LIB_BUILTIN (BUILT_IN_STRNCPY_CHK, "__strncpy_chk", BT_FN_STRING_STRING_CONST_STRING_SIZE_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF) DEF_EXT_LIB_BUILTIN (BUILT_IN_SNPRINTF_CHK, "__snprintf_chk", BT_FN_INT_STRING_SIZE_INT_SIZE_CONST_STRING_VAR, ATTR_FORMAT_PRINTF_NOTHROW_5_6) DEF_EXT_LIB_BUILTIN (BUILT_IN_SPRINTF_CHK, "__sprintf_chk", BT_FN_INT_STRING_INT_SIZE_CONST_STRING_VAR, ATTR_FORMAT_PRINTF_NOTHROW_4_5) DEF_EXT_LIB_BUILTIN (BUILT_IN_VSNPRINTF_CHK, "__vsnprintf_chk", BT_FN_INT_STRING_SIZE_INT_SIZE_CONST_STRING_VALIST_ARG, ATTR_FORMAT_PRINTF_NOTHROW_5_0) diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 47dadd8c38b..bb502baf72d 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,9 @@ +2016-11-23 Richard Biener + Prathamesh Kulkarni + + PR tree-optimization/78154 + * gcc.dg/tree-ssa/pr78154.c: New test. + 2016-11-23 Naveen H.S * gcc.dg/pr31096.c: New testcase. diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr78154.c b/gcc/testsuite/gcc.dg/tree-ssa/pr78154.c new file mode 100644 index 00000000000..d908a39dcd6 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr78154.c @@ -0,0 +1,43 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-evrp-slim" } */ + +void f(void *d, const void *s, __SIZE_TYPE__ n) +{ + void *t1 = __builtin_memcpy (d, s, n); + if (t1 == 0) + __builtin_abort (); + + void *t2 = __builtin_memmove (d, s, n); + if (t2 == 0) + __builtin_abort (); + + void *t3 = __builtin_memset (d, 0, n); + if (t3 == 0) + __builtin_abort (); + + void *t4 = __builtin_strcpy (d, s); + if (t4 == 0) + __builtin_abort (); + + void *t5 = __builtin_strncpy (d, s, n); + if (t5 == 0) + __builtin_abort (); + + void *t6 = __builtin_strcat (d, s); + if (t6 == 0) + __builtin_abort (); + + void *t7 = __builtin_strncat (d, s, n); + if (t7 == 0) + __builtin_abort (); + + void *t8 = __builtin_stpcpy (d, s); + if (t8 == 0) + __builtin_abort (); + + void *t9 = __builtin_stpncpy (d, s, n); + if (t9 == 0) + __builtin_abort (); +} + +/* { dg-final { scan-tree-dump-not "__builtin_abort" "evrp" } } */ diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index c2a41332044..5bd4418eea3 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -1097,6 +1097,20 @@ gimple_stmt_nonzero_warnv_p (gimple *stmt, bool *strict_overflow_p) lookup_attribute ("returns_nonnull", TYPE_ATTRIBUTES (gimple_call_fntype (stmt)))) return true; + + gcall *call_stmt = as_a (stmt); + unsigned rf = gimple_call_return_flags (call_stmt); + if (rf & ERF_RETURNS_ARG) + { + unsigned argnum = rf & ERF_RETURN_ARG_MASK; + if (argnum < gimple_call_num_args (call_stmt)) + { + tree arg = gimple_call_arg (call_stmt, argnum); + if (SSA_VAR_P (arg) + && infer_nonnull_range_by_attribute (stmt, arg)) + return true; + } + } return gimple_alloca_call_p (stmt); } default: