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| author | Siddhesh Poyarekar <siddhesh@gotplt.org> | 2023-01-24 19:47:05 -0500 |
|---|---|---|
| committer | Siddhesh Poyarekar <siddhesh@gotplt.org> | 2023-01-24 19:47:05 -0500 |
| commit | b851ee9fdf0f3023635f0cb1f7c607b2d6801053 (patch) | |
| tree | 8e81c1f792baf54fb1043f359ef2ed679b41e58e /gcc | |
| parent | 0fa221685a36ef98cb20a6d435a150b5992e99e0 (diff) | |
| download | gcc-b851ee9fdf0f3023635f0cb1f7c607b2d6801053.zip gcc-b851ee9fdf0f3023635f0cb1f7c607b2d6801053.tar.gz gcc-b851ee9fdf0f3023635f0cb1f7c607b2d6801053.tar.bz2 | |
tree-optimization/108522 Use COMPONENT_REF offset when available
Use the offset in TREE_OPERAND(component_ref, 2) when available instead
of DECL_FIELD_OFFSET when trying to compute offset for a COMPONENT_REF.
Co-authored-by: Jakub Jelinek <jakub@redhat.com>
gcc/ChangeLog:
PR tree-optimization/108522
* tree-object-size.cc (compute_object_offset): Use
TREE_OPERAND(ref, 2) for COMPONENT_REF when available.
gcc/testsuite/ChangeLog:
PR tree-optimization/108522
* gcc.dg/builtin-dynamic-object-size-0.c
(test_dynarray_struct_member): New test.
(main): Call it.
Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org>
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c | 16 | ||||
| -rw-r--r-- | gcc/tree-object-size.cc | 4 |
2 files changed, 19 insertions, 1 deletions
diff --git a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c index f9047a0..569c0a8 100644 --- a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c +++ b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c @@ -314,6 +314,20 @@ test_dynarray_struct_subobj2 (size_t sz, size_t off, size_t *objsz) return __builtin_dynamic_object_size (&bin.c[off], 1); } +/* See pr #108522. */ +size_t +__attribute__ ((noinline)) +test_dynarray_struct_member (size_t sz) +{ + struct + { + char a[sz]; + char b; + } s; + + return __builtin_dynamic_object_size (&s.b, 0); +} + size_t __attribute__ ((noinline)) test_substring (size_t sz, size_t off) @@ -619,6 +633,8 @@ main (int argc, char **argv) if (test_dynarray_struct_subobj2 (42, 4, &objsz) != objsz - 4 - sizeof (long) - sizeof (int)) FAIL (); + if (test_dynarray_struct_member (42) != sizeof (char)) + FAIL (); if (test_substring_ptrplus (128, 4) != (128 - 4) * sizeof (int)) FAIL (); if (test_substring_ptrplus (128, 142) != 0) diff --git a/gcc/tree-object-size.cc b/gcc/tree-object-size.cc index 356591c..de93ffa 100644 --- a/gcc/tree-object-size.cc +++ b/gcc/tree-object-size.cc @@ -412,7 +412,9 @@ compute_object_offset (const_tree expr, const_tree var) return base; t = TREE_OPERAND (expr, 1); - off = size_binop (PLUS_EXPR, DECL_FIELD_OFFSET (t), + off = size_binop (PLUS_EXPR, + (TREE_OPERAND (expr, 2) ? TREE_OPERAND (expr, 2) + : DECL_FIELD_OFFSET (t)), size_int (tree_to_uhwi (DECL_FIELD_BIT_OFFSET (t)) / BITS_PER_UNIT)); break; |