69165332a9
constant_byte_string now uses a convert_to_bytes function, which doesn't handle bitfields at all (don't punt on them, just puts them into wrong bits or bytes). Furthermore, I don't see a reason why that function should exist at all, it duplicates native_encode_initializer functionality. Except that native_encode_initializer punted on flexible array members and 2 tests in the testsuite relied on constant_byte_string handling those. So, this patch throws away convert_to_bytes, uses native_encode_initializer instead, but teaches it to handle flexible array members (only in the non-mask mode with off == -1 for now), furthermore, it adds various corner case checks that the old implementation was missing (like that STRING_CSTs use int as length and therefore we shouldn't try to build larger than that strings, or that native_encode*/native_interpret* APIs require sane host and target bytes (8-bit on both). 2020-12-19 Jakub Jelinek <jakub@redhat.com> PR middle-end/98366 * fold-const.c (native_encode_initializer): Don't try to memset more than total_bytes with off == -1 even if len is large. Handle flexible array member initializers if off == -1 and mask is NULL. * expr.c (convert_to_bytes): Remove. (constant_byte_string): Use native_encode_initializer instead of convert_to_bytes. Remove extraneous semicolon. Punt on various corner-cases the APIs don't handle, like sizes > INT_MAX, BITS_PER_UNIT != 8, CHAR_BIT != 8. * gcc.c-torture/execute/pr98366.c: New test. |
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