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| author | Tom Tromey <tom@tromey.com> | 2017-10-02 13:47:15 -0600 |
|---|---|---|
| committer | Tom Tromey <tom@tromey.com> | 2017-10-02 14:06:48 -0600 |
| commit | b3e3859bc577db5b79bb3d39048fd46c0a0420ef (patch) | |
| tree | dd763223288447e29296b120520b709e4020dded /gdb/rust-lang.c | |
| parent | 01af5e0d09ac9c621e7b280f44a2c7ef55784493 (diff) | |
| download | gdb-b3e3859bc577db5b79bb3d39048fd46c0a0420ef.zip gdb-b3e3859bc577db5b79bb3d39048fd46c0a0420ef.tar.gz gdb-b3e3859bc577db5b79bb3d39048fd46c0a0420ef.tar.bz2 | |
Fix ptype of Rust slices
Something like "ptype &x[..]" (where "x" was a slice) would crash gdb.
rust_subscript wasn't handling slicing in the EVAL_AVOID_SIDE_EFFECTS
case.
2017-10-02 Tom Tromey <tom@tromey.com>
* rust-lang.c (rust_subscript): Handle slices in
EVAL_AVOID_SIDE_EFFECTS case.
2017-10-02 Tom Tromey <tom@tromey.com>
* gdb.rust/simple.exp: Test ptype of a slice.
Diffstat (limited to 'gdb/rust-lang.c')
| -rw-r--r-- | gdb/rust-lang.c | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/gdb/rust-lang.c b/gdb/rust-lang.c index a9895fe..9b64efa 100644 --- a/gdb/rust-lang.c +++ b/gdb/rust-lang.c @@ -1456,17 +1456,53 @@ rust_subscript (struct expression *exp, int *pos, enum noside noside, else low = value_as_long (rhs); + struct type *type = check_typedef (value_type (lhs)); if (noside == EVAL_AVOID_SIDE_EFFECTS) { - struct type *type = check_typedef (value_type (lhs)); + struct type *base_type = nullptr; + if (TYPE_CODE (type) == TYPE_CODE_ARRAY) + base_type = TYPE_TARGET_TYPE (type); + else if (rust_slice_type_p (type)) + { + for (int i = 0; i < TYPE_NFIELDS (type); ++i) + { + if (strcmp (TYPE_FIELD_NAME (type, i), "data_ptr") == 0) + { + base_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, i)); + break; + } + } + if (base_type == nullptr) + error (_("Could not find 'data_ptr' in slice type")); + } + else if (TYPE_CODE (type) == TYPE_CODE_PTR) + base_type = TYPE_TARGET_TYPE (type); + else + error (_("Cannot subscript non-array type")); + + struct type *new_type; + if (want_slice) + { + if (rust_slice_type_p (type)) + new_type = type; + else + { + struct type *usize + = language_lookup_primitive_type (exp->language_defn, + exp->gdbarch, + "usize"); + new_type = rust_slice_type ("&[*gdb*]", base_type, usize); + } + } + else + new_type = base_type; - result = value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (lhs)); + return value_zero (new_type, VALUE_LVAL (lhs)); } else { LONGEST low_bound; struct value *base; - struct type *type = check_typedef (value_type (lhs)); if (TYPE_CODE (type) == TYPE_CODE_ARRAY) { |