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| author | Jakub Jelinek <jakub@redhat.com> | 2019-02-21 00:01:41 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2019-02-21 00:01:41 +0100 |
| commit | cd56fb7957a9b2b685f7dec2db6307bde5a0d4f0 (patch) | |
| tree | 07ffe1091210a8bbe5c67b162c409fec3ac87f3d /gcc/fold-const.c | |
| parent | b2d6c9e88c22c18b1109bb39f265f64fffdbb901 (diff) | |
| download | gcc-cd56fb7957a9b2b685f7dec2db6307bde5a0d4f0.zip gcc-cd56fb7957a9b2b685f7dec2db6307bde5a0d4f0.tar.gz gcc-cd56fb7957a9b2b685f7dec2db6307bde5a0d4f0.tar.bz2 | |
re PR middle-end/89091 (ICE: Segmentation fault (in tree_class_check))
PR middle-end/89091
* fold-const.c (decode_field_reference): Return NULL_TREE if
lang_hooks.types.type_for_size returns NULL. Check it before
overwriting *exp_. Use return NULL_TREE instead of return 0.
* gcc.dg/torture/pr89091.c: New test.
Co-Authored-By: David Malcolm <dmalcolm@redhat.com>
From-SVN: r269056
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index fcc1c45..b019a91 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -4280,7 +4280,7 @@ decode_field_reference (location_t loc, tree *exp_, HOST_WIDE_INT *pbitsize, There are problems with FP fields since the type_for_size call below can fail for, e.g., XFmode. */ if (! INTEGRAL_TYPE_P (TREE_TYPE (exp))) - return 0; + return NULL_TREE; /* We are interested in the bare arrangement of bits, so strip everything that doesn't affect the machine mode. However, record the type of the @@ -4296,7 +4296,7 @@ decode_field_reference (location_t loc, tree *exp_, HOST_WIDE_INT *pbitsize, exp = TREE_OPERAND (exp, 0); STRIP_NOPS (exp); STRIP_NOPS (and_mask); if (TREE_CODE (and_mask) != INTEGER_CST) - return 0; + return NULL_TREE; } poly_int64 poly_bitsize, poly_bitpos; @@ -4312,7 +4312,11 @@ decode_field_reference (location_t loc, tree *exp_, HOST_WIDE_INT *pbitsize, || (! AGGREGATE_TYPE_P (TREE_TYPE (inner)) && compare_tree_int (TYPE_SIZE (TREE_TYPE (inner)), *pbitpos + *pbitsize) < 0)) - return 0; + return NULL_TREE; + + unsigned_type = lang_hooks.types.type_for_size (*pbitsize, 1); + if (unsigned_type == NULL_TREE) + return NULL_TREE; *exp_ = exp; @@ -4323,7 +4327,6 @@ decode_field_reference (location_t loc, tree *exp_, HOST_WIDE_INT *pbitsize, *punsignedp = TYPE_UNSIGNED (outer_type); /* Compute the mask to access the bitfield. */ - unsigned_type = lang_hooks.types.type_for_size (*pbitsize, 1); precision = TYPE_PRECISION (unsigned_type); mask = build_int_cst_type (unsigned_type, -1); |