debuginfo: Fix type description generic enum discriminants.

src/librustc_trans/trans/debuginfo/metadata.rs

@@ -1606,13 +1606,10 @@ fn prepare_enum_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
         .collect();
 
     let discriminant_type_metadata = |inttype| {
-        // We can reuse the type of the discriminant for all monomorphized
-        // instances of an enum because it doesn't depend on any type
-        // parameters. The def_id, uniquely identifying the enum's polytype acts
-        // as key in this cache.
+        let disr_type_key = (enum_def_id, inttype);
         let cached_discriminant_type_metadata = debug_context(cx).created_enum_disr_types
                                                                  .borrow()
-                                                                 .get(&enum_def_id).cloned();
+                                                                 .get(&disr_type_key).cloned();
         match cached_discriminant_type_metadata {
             Some(discriminant_type_metadata) => discriminant_type_metadata,
             None => {
@@ -1641,7 +1638,7 @@ fn prepare_enum_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
 
                 debug_context(cx).created_enum_disr_types
                                  .borrow_mut()
-                                 .insert(enum_def_id, discriminant_type_metadata);
+                                 .insert(disr_type_key, discriminant_type_metadata);
 
                 discriminant_type_metadata
             }

src/librustc_trans/trans/debuginfo/mod.rs

@@ -32,7 +32,7 @@ use trans;
 use trans::monomorphize;
 use middle::ty::Ty;
 use session::config::{self, FullDebugInfo, LimitedDebugInfo, NoDebugInfo};
-use util::nodemap::{DefIdMap, NodeMap, FnvHashMap, FnvHashSet};
+use util::nodemap::{NodeMap, FnvHashMap, FnvHashSet};
 
 use libc::c_uint;
 use std::cell::{Cell, RefCell};
@@ -41,6 +41,7 @@ use std::ptr;
 use std::rc::Rc;
 use syntax::codemap::{Span, Pos};
 use syntax::{ast, codemap, ast_util};
+use syntax::attr::IntType;
 use syntax::parse::token::{self, special_idents};
 
 pub mod gdb;
@@ -73,7 +74,7 @@ pub struct CrateDebugContext<'tcx> {
     builder: DIBuilderRef,
     current_debug_location: Cell<InternalDebugLocation>,
     created_files: RefCell<FnvHashMap<String, DIFile>>,
-    created_enum_disr_types: RefCell<DefIdMap<DIType>>,
+    created_enum_disr_types: RefCell<FnvHashMap<(ast::DefId, IntType), DIType>>,
 
     type_map: RefCell<TypeMap<'tcx>>,
     namespace_map: RefCell<FnvHashMap<Vec<ast::Name>, Rc<NamespaceTreeNode>>>,
@@ -94,7 +95,7 @@ impl<'tcx> CrateDebugContext<'tcx> {
             builder: builder,
             current_debug_location: Cell::new(InternalDebugLocation::UnknownLocation),
             created_files: RefCell::new(FnvHashMap()),
-            created_enum_disr_types: RefCell::new(DefIdMap()),
+            created_enum_disr_types: RefCell::new(FnvHashMap()),
             type_map: RefCell::new(TypeMap::new()),
             namespace_map: RefCell::new(FnvHashMap()),
             composite_types_completed: RefCell::new(FnvHashSet()),

src/test/debuginfo/generic-enum-with-different-disr-sizes.rs

@@ -0,0 +1,91 @@
+// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// ignore-tidy-linelength
+// min-lldb-version: 310
+
+// compile-flags:-g
+
+// === GDB TESTS ===================================================================================
+// gdb-command:run
+
+// gdb-command:print eight_bytes1
+// gdb-check:$1 = {{RUST$ENUM$DISR = Variant1, __0 = 100}, {RUST$ENUM$DISR = Variant1, __0 = 100}}
+// gdb-command:print four_bytes1
+// gdb-check:$2 = {{RUST$ENUM$DISR = Variant1, __0 = 101}, {RUST$ENUM$DISR = Variant1, __0 = 101}}
+// gdb-command:print two_bytes1
+// gdb-check:$3 = {{RUST$ENUM$DISR = Variant1, __0 = 102}, {RUST$ENUM$DISR = Variant1, __0 = 102}}
+// gdb-command:print one_byte1
+// gdb-check:$4 = {{RUST$ENUM$DISR = Variant1, __0 = 65 'A'}, {RUST$ENUM$DISR = Variant1, __0 = 65 'A'}}
+
+// gdb-command:print eight_bytes2
+// gdb-check:$5 = {{RUST$ENUM$DISR = Variant2, __0 = 100}, {RUST$ENUM$DISR = Variant2, __0 = 100}}
+// gdb-command:print four_bytes2
+// gdb-check:$6 = {{RUST$ENUM$DISR = Variant2, __0 = 101}, {RUST$ENUM$DISR = Variant2, __0 = 101}}
+// gdb-command:print two_bytes2
+// gdb-check:$7 = {{RUST$ENUM$DISR = Variant2, __0 = 102}, {RUST$ENUM$DISR = Variant2, __0 = 102}}
+// gdb-command:print one_byte2
+// gdb-check:$8 = {{RUST$ENUM$DISR = Variant2, __0 = 65 'A'}, {RUST$ENUM$DISR = Variant2, __0 = 65 'A'}}
+
+// gdb-command:continue
+
+// === LLDB TESTS ==================================================================================
+// lldb-command:run
+
+// lldb-command:print eight_bytes1
+// lldb-check:[...]$0 = Variant1(100)
+// lldb-command:print four_bytes1
+// lldb-check:[...]$1 = Variant1(101)
+// lldb-command:print two_bytes1
+// lldb-check:[...]$2 = Variant1(102)
+// lldb-command:print one_byte1
+// lldb-check:[...]$3 = Variant1('A')
+
+// lldb-command:print eight_bytes2
+// lldb-check:[...]$4 = Variant2(100)
+// lldb-command:print four_bytes2
+// lldb-check:[...]$5 = Variant2(101)
+// lldb-command:print two_bytes2
+// lldb-check:[...]$6 = Variant2(102)
+// lldb-command:print one_byte2
+// lldb-check:[...]$7 = Variant2('A')
+
+// lldb-command:continue
+
+#![allow(unused_variables)]
+#![allow(dead_code)]
+#![omit_gdb_pretty_printer_section]
+
+// This test case makes sure that we get correct type descriptions for the enum
+// discriminant of different instantiations of the same generic enum type where,
+// dependending on the generic type parameter(s), the discriminant has a
+// different size in memory.
+
+enum Enum<T> {
+    Variant1(T),
+    Variant2(T)
+}
+
+fn main() {
+    // These are ordered for descending size on purpose
+    let eight_bytes1 = Enum::Variant1(100.0f64);
+    let four_bytes1 = Enum::Variant1(101i32);
+    let two_bytes1 = Enum::Variant1(102i16);
+    let one_byte1 = Enum::Variant1(65u8);
+
+    let eight_bytes2 = Enum::Variant2(100.0f64);
+    let four_bytes2 = Enum::Variant2(101i32);
+    let two_bytes2 = Enum::Variant2(102i16);
+    let one_byte2 = Enum::Variant2(65u8);
+
+    zzz(); // #break
+}
+
+fn zzz() { () }