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From: Richard Biener <rguenth@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r12-859] c/100547 - reject overly large vector_size attributes Date: Tue, 18 May 2021 07:03:46 +0000 (GMT) [thread overview] Message-ID: <20210518070346.DAADE3850404@sourceware.org> (raw) https://gcc.gnu.org/g:4054472b3fa15e11ccd48190f5e3ecfc89d65af9 commit r12-859-g4054472b3fa15e11ccd48190f5e3ecfc89d65af9 Author: Richard Biener <rguenther@suse.de> Date: Wed May 12 09:20:17 2021 +0200 c/100547 - reject overly large vector_size attributes This rejects a number of vector components that does not fit an 'int' which is an internal limitation of RTVEC. This requires adjusting gcc.dg/attr-vector_size.c which checks for much larger supported vectors. Note that the RTVEC limitation is a host specific limitation (unless we change this 'int' to int32_t), but should be 32bits in practice everywhere. 2021-05-12 Richard Biener <rguenther@suse.de> PR c/100547 gcc/c-family/ * c-attribs.c (type_valid_for_vector_size): Reject too large nunits. Reword existing nunit diagnostic. gcc/testsuite/ * gcc.dg/pr100547.c: New testcase. * gcc.dg/attr-vector_size.c: Adjust. Diff: --- gcc/c-family/c-attribs.c | 16 +++++++++++++-- gcc/testsuite/gcc.dg/attr-vector_size.c | 16 --------------- gcc/testsuite/gcc.dg/pr100547.c | 35 +++++++++++++++++++++++++++++++++ 3 files changed, 49 insertions(+), 18 deletions(-) diff --git a/gcc/c-family/c-attribs.c b/gcc/c-family/c-attribs.c index f54388e9939..ecb32c70172 100644 --- a/gcc/c-family/c-attribs.c +++ b/gcc/c-family/c-attribs.c @@ -4245,10 +4245,22 @@ type_valid_for_vector_size (tree type, tree atname, tree args, if (nunits & (nunits - 1)) { if (error_p) - error ("number of components of the vector not a power of two"); + error ("number of vector components %wu not a power of two", nunits); else warning (OPT_Wattributes, - "number of components of the vector not a power of two"); + "number of vector components %wu not a power of two", nunits); + return NULL_TREE; + } + + if (nunits >= (unsigned HOST_WIDE_INT)INT_MAX) + { + if (error_p) + error ("number of vector components %wu exceeds %d", + nunits, INT_MAX - 1); + else + warning (OPT_Wattributes, + "number of vector components %wu exceeds %d", + nunits, INT_MAX - 1); return NULL_TREE; } diff --git a/gcc/testsuite/gcc.dg/attr-vector_size.c b/gcc/testsuite/gcc.dg/attr-vector_size.c index 00be26accd5..3f2ce889121 100644 --- a/gcc/testsuite/gcc.dg/attr-vector_size.c +++ b/gcc/testsuite/gcc.dg/attr-vector_size.c @@ -22,14 +22,6 @@ DEFVEC (extern, 30); #if __SIZEOF_SIZE_T__ > 4 -DEFVEC (extern, 31); -DEFVEC (extern, 32); -DEFVEC (extern, 33); -DEFVEC (extern, 34); -DEFVEC (extern, 60); -DEFVEC (extern, 61); -DEFVEC (extern, 62); - VEC (POW2 (63)) char v63; /* { dg-error "'vector_size' attribute argument value '9223372036854775808' exceeds 9223372036854775807" "LP64" { target lp64 } } */ #else @@ -49,14 +41,6 @@ void test_local_scope (void) #if __SIZEOF_SIZE_T__ > 4 - DEFVEC (auto, 31); - DEFVEC (auto, 32); - DEFVEC (auto, 33); - DEFVEC (auto, 34); - DEFVEC (auto, 60); - DEFVEC (auto, 61); - DEFVEC (auto, 62); - VEC (POW2 (63)) char v63; /* { dg-error "'vector_size' attribute argument value '9223372036854775808' exceeds 9223372036854775807" "LP64" { target lp64 } } */ #else diff --git a/gcc/testsuite/gcc.dg/pr100547.c b/gcc/testsuite/gcc.dg/pr100547.c new file mode 100644 index 00000000000..2d3da4eb50e --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr100547.c @@ -0,0 +1,35 @@ +/* { dg-do compile { target lp64 } } */ +/* { dg-options "-O -g" } */ + +typedef int __attribute__((vector_size( + ((((((((((((((((((((((((((((((8 * sizeof(short)) * sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)) * + sizeof(short)))) V; /* { dg-error "number of vector components" } */ +void k() { V w = { 0 }; }
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