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Print Rust unsized array types a bit more nicely

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It's a bit difficult to create an unsized array type in Rust, but if
you do, right now ptype will show something like "[u8; ]".  It really
should print "[u8]", though, which is what this patch implements.

This is part of PR 21466.

Built and regtested on x86-64 Fedora 25.  I'm checking this in.

ChangeLog
2017-05-21  Tom Tromey  <tom@tromey.com>

	PR rust/21466:
	* rust-lang.c (rust_print_type) <TYPE_CODE_ARRAY>: Print unsized
	arrays as "[T]", not "[T; ]".

testsuite/ChangeLog
2017-05-21  Tom Tromey  <tom@tromey.com>

	PR rust/21466:
	* gdb.rust/unsized.exp: New file.
	* gdb.rust/unsized.rs: New file.
This commit is contained in:
Tom Tromey 2017-05-21 17:00:10 -06:00
parent 56298620ac
commit e6cf65f283
5 changed files with 82 additions and 3 deletions
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5
gdb/rust-lang.c
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@ -893,13 +893,12 @@ rust_print_type (struct type *type, const char *varstring,
fputs_filtered ("[", stream);
rust_print_type (TYPE_TARGET_TYPE (type), NULL,
stream, show - 1, level, flags);
fputs_filtered ("; ", stream);
if (TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (type)) == PROP_LOCEXPR
|| TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (type)) == PROP_LOCLIST)
fprintf_filtered (stream, "variable length");
fprintf_filtered (stream, "; variable length");
else if (get_array_bounds (type, &low_bound, &high_bound))
fprintf_filtered (stream, "%s",
fprintf_filtered (stream, "; %s",
plongest (high_bound - low_bound + 1));
fputs_filtered ("]", stream);
}