diff options
Diffstat (limited to 'gcc/tree.c')
| -rw-r--r-- | gcc/tree.c | 58 |
1 files changed, 56 insertions, 2 deletions
@@ -2301,13 +2301,36 @@ int_size_in_bytes (type) if (t == 0 || TREE_CODE (t) != INTEGER_CST || TREE_OVERFLOW (t) - || TREE_INT_CST_HIGH (t) != 0) + || TREE_INT_CST_HIGH (t) != 0 + /* If the result would appear negative, it's too big to represent. */ + || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0) return -1; return TREE_INT_CST_LOW (t); } + +/* Return the bit position of FIELD, in bits from the start of the record. + This is a tree of type bitsizetype. */ + +tree +bit_position (field) + tree field; +{ + return DECL_FIELD_BITPOS (field); +} + +/* Likewise, but return as an integer. Abort if it cannot be represented + in that way (since it could be a signed value, we don't have the option + of returning -1 like int_size_in_byte can. */ -/* Return the strictest alignment, in bits, that T is known to have. */ +HOST_WIDE_INT +int_bit_position (field) + tree field; +{ + return tree_low_cst (bit_position (field), 0); +} + +/* Return the strictest alignment, in bits, that T is known to have. */ unsigned int expr_align (t) @@ -4107,6 +4130,37 @@ tree_int_cst_lt (t1, t2) return INT_CST_LT_UNSIGNED (t1, t2); } +/* Return 1 if T is an INTEGER_CST that can be represented in a single + HOST_WIDE_INT value. If POS is nonzero, the result must be positive. */ + +int +host_integerp (t, pos) + tree t; + int pos; +{ + return (TREE_CODE (t) == INTEGER_CST + && ! TREE_OVERFLOW (t) + && ((TREE_INT_CST_HIGH (t) == 0 + && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) >= 0) + || (! pos && TREE_INT_CST_HIGH (t) == -1 + && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0))); +} + +/* Return the HOST_WIDE_INT least significant bits of T if it is an + INTEGER_CST and there is no overflow. POS is nonzero if the result must + be positive. Abort if we cannot satisfy the above conditions. */ + +HOST_WIDE_INT +tree_low_cst (t, pos) + tree t; + int pos; +{ + if (host_integerp (t, pos)) + return TREE_INT_CST_LOW (t); + else + abort (); +} + /* Return the most significant bit of the integer constant T. */ int |