Re: [PATCH] Fix handling of discriminantless univariant enums in Rust

Manish Goregaokar
2016-10-30T03:40:23Z

Rolled up patch:

From 789f95700e43b29d0c374985f8504eb414c85eec Mon Sep 17 00:00:00 2001
From: Manish Goregaokar <manish@mozilla.com>
Date: Thu, 27 Oct 2016 16:46:34 -0700
Subject: [PATCH] Fix handling of discriminantless univariant enums in Rust;
fix bug with encoded enums

2016-10-27 Manish Goregaokar <manish@mozilla.com>

gdb/ChangeLog:
* rust-lang.c (rust_get_disr_info): Treat univariant enums
without discriminants as encoded enums with a real field
* rust-lang.c (rust_evaluate_subexp): Handle field access
on encoded struct-like enums

gdb/testsuite/ChangeLog:
* simple.rs: Add test for univariant enums without discriminants
and for encoded struct-like enums
* simple.exp: Add test expectations
---
gdb/rust-lang.c | 17 +++++++++++++++--
gdb/testsuite/gdb.rust/simple.exp | 11 +++++++++++
gdb/testsuite/gdb.rust/simple.rs | 30 ++++++++++++++++++++++++++++++
3 files changed, 56 insertions(+), 2 deletions(-)

diff --git a/gdb/rust-lang.c b/gdb/rust-lang.c
index 82cd3f9..63c7992 100644
--- a/gdb/rust-lang.c
+++ b/gdb/rust-lang.c
@@ -194,7 +194,18 @@ rust_get_disr_info (struct type *type, const
gdb_byte *valaddr,
has changed its debuginfo format. */
error (_("Could not find enum discriminant field"));
}
-
+ else if (TYPE_NFIELDS (type) == 1) {
+ /* Sometimes univariant enums are encoded without a
+ discriminant. In that case, treating it as an encoded enum
+ with the first field being the actual type works. */
+ const char* field_name = TYPE_NAME (TYPE_FIELD_TYPE (type, 0));
+ ret.name = concat (TYPE_NAME (type), "::",
+ rust_last_path_segment (field_name),
+ (char *) NULL);
+ ret.field_no = RUST_ENCODED_ENUM_REAL;
+ ret.is_encoded = 1;
+ return ret;
+ }
if (strcmp (TYPE_FIELD_NAME (disr_type, 0), "RUST$ENUM$DISR") != 0)
error (_("Rust debug format has changed"));

@@ -1725,7 +1736,9 @@ tuple structs, and tuple-like enum variants"));
variant_type = TYPE_FIELD_TYPE (type, disr.field_no);

if (variant_type == NULL
- || rust_tuple_variant_type_p (variant_type))
+ || (disr.is_encoded
+ ? rust_tuple_struct_type_p (variant_type)
+ : rust_tuple_variant_type_p (variant_type)))
error(_("Attempting to access named field %s of tuple variant %s, \
which has only anonymous fields"),
field_name, disr.name);
diff --git a/gdb/testsuite/gdb.rust/simple.exp
b/gdb/testsuite/gdb.rust/simple.exp
index 5e00b03..14eae2e 100644
--- a/gdb/testsuite/gdb.rust/simple.exp
+++ b/gdb/testsuite/gdb.rust/simple.exp
@@ -103,6 +103,11 @@ gdb_test_sequence "ptype z" "" {
}
gdb_test "print z.1" " = 8"

+gdb_test "print univariant" " = simple::Univariant::Foo{a: 1}"
+gdb_test "print univariant.a" " = 1"
+gdb_test "print univariant_anon" " = simple::UnivariantAnon::Foo\\(1\\)"
+gdb_test "print univariant_anon.0" " = 1"
+
gdb_test_sequence "ptype simple::ByeBob" "" {
" = struct simple::ByeBob \\("
" i32,"
@@ -220,3 +225,9 @@ gdb_test "print (1,)" "Tuple expressions not supported yet"
gdb_test "print (1)" " = 1"

gdb_test "print 23..97.0" "Range expression with different types"
+
+gdb_test "print (*parametrized.next.val)" \
+ " = simple::ParametrizedStruct<i32> {next:
simple::ParametrizedEnum<Box<simple::ParametrizedStruct<i32>>>::Empty,
value: 1}"
+gdb_test "print parametrized.next.val" " =
\\(simple::ParametrizedStruct<i32> \\*\\) $hex"
+gdb_test "print parametrized" \
+ " = simple::ParametrizedStruct<i32> \\{next:
simple::ParametrizedEnum<Box<simple::ParametrizedStruct<i32>>>::Val\\{val:
$hex\\}, value: 0\\}"
\ No newline at end of file
diff --git a/gdb/testsuite/gdb.rust/simple.rs b/gdb/testsuite/gdb.rust/simple.rs
index eeff3d7..670f54e 100644
--- a/gdb/testsuite/gdb.rust/simple.rs
+++ b/gdb/testsuite/gdb.rust/simple.rs
@@ -63,6 +63,23 @@ enum SpaceSaver {
Nothing,
}

+enum Univariant {
+ Foo {a: u8}
+}
+enum UnivariantAnon {
+ Foo(u8)
+}
+
+enum ParametrizedEnum<T> {
+ Val { val: T },
+ Empty,
+}
+
+struct ParametrizedStruct<T> {
+ next: ParametrizedEnum<Box<ParametrizedStruct<T>>>,
+ value: T
+}
+
fn main () {
let a = ();
let b : [i32; 0] = [];
@@ -93,6 +110,9 @@ fn main () {
let y = HiBob {field1: 7, field2: 8};
let z = ByeBob(7, 8);

+ let univariant = Univariant::Foo {a : 1};
+ let univariant_anon = UnivariantAnon::Foo(1);
+
let slice = &w[2..3];
let fromslice = slice[0];
let slice2 = &slice[0..1];
@@ -117,6 +137,16 @@ fn main () {
let custom_some = NonZeroOptimized::Value("hi".into());
let custom_none = NonZeroOptimized::Empty;

+ let parametrized = ParametrizedStruct {
+ next: ParametrizedEnum::Val {
+ val: Box::new(ParametrizedStruct {
+ next: ParametrizedEnum::Empty,
+ value: 1,
+ })
+ },
+ value: 0,
+ };
+
println!("{}, {}", x.0, x.1); // set breakpoint here
println!("{}", diff2(92, 45));
empty();
--
2.10.1

-Manish

On Sat, Oct 29, 2016 at 8:35 PM, Manish Goregaokar <manish@mozilla.com> wrote:
> Yes, I'm trying it with the followup patch. I kept them separate since
> that's an independent bug that just affects univariant ones too. Will
> roll them together.
> -Manish
>
>
> On Sat, Oct 29, 2016 at 8:34 PM, Tom Tromey <tom@tromey.com> wrote:
>>>>>>> "Manish" == Manish Goregaokar <manish@mozilla.com> writes:
>>
>> Manish> `print univariant.a` works for me.
>>
>> I tried this patch and it failed the way I thought it would:
>>
>> print univariant.a
>> Attempting to access named field a of tuple variant simple::Univariant::Foo, which has only anonymous fields
>> (gdb) FAIL: gdb.rust/simple.exp: print univariant.a
>>
>>
>> Maybe you're trying it with the follow-up patch installed?
>> In that case I think the patches should probably be combined.
>>
>> Tom