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gcc7/gcc7-bsc1146475.patch

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2019-10-01 Alexandre Oliva <oliva@adacore.com>
PR debug/91507
* dwarf2out.c (override_type_for_decl_p): New.
(gen_variable_die): Use it.
* gcc.dg/debug/dwarf2/array-0.c: New.
* gcc.dg/debug/dwarf2/array-1.c: New.
* gcc.dg/debug/dwarf2/array-2.c: New.
* gcc.dg/debug/dwarf2/array-3.c: New.
* g++.dg/debug/dwarf2/array-0.C: New.
* g++.dg/debug/dwarf2/array-1.C: New.
* g++.dg/debug/dwarf2/array-2.C: New. Based on libstdc++-v3's
src/c++98/pool_allocator.cc:__pool_alloc_base::_S_heap_size.
* g++.dg/debug/dwarf2/array-3.C: New. Based on
gcc's config/i386/i386-features.c:xlogue_layout::s_instances.
* g++.dg/debug/dwarf2/array-4.C: New.
Index: gcc/testsuite/gcc.dg/debug/dwarf2/array-0.c
===================================================================
--- gcc/testsuite/gcc.dg/debug/dwarf2/array-0.c (nonexistent)
+++ gcc/testsuite/gcc.dg/debug/dwarf2/array-0.c (revision 276403)
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-gdwarf-2 -dA" } */
+extern int array[42];
+
+int array[42];
+
+/* Verify that we get only one DW_TAG_subtrange_type (plus abbrev),
+ with a DW_AT_upper_bound. */
+/* { dg-final { scan-assembler-times " DW_TAG_subrange_type" 2 } } */
+/* { dg-final { scan-assembler-times " DW_AT_upper_bound" 1 } } */
Index: gcc/testsuite/gcc.dg/debug/dwarf2/array-2.c
===================================================================
--- gcc/testsuite/gcc.dg/debug/dwarf2/array-2.c (nonexistent)
+++ gcc/testsuite/gcc.dg/debug/dwarf2/array-2.c (revision 276403)
@@ -0,0 +1,8 @@
+/* { dg-do compile } */
+/* { dg-options "-gdwarf-2 -dA" } */
+int array[42];
+
+/* Verify that we get only one DW_TAG_subtrange_type (plus abbrev)
+ with DW_AT_upper_bound. */
+/* { dg-final { scan-assembler-times " DW_TAG_subrange_type" 2 } } */
+/* { dg-final { scan-assembler-times " DW_AT_upper_bound" 1 } } */
Index: gcc/testsuite/gcc.dg/debug/dwarf2/array-1.c
===================================================================
--- gcc/testsuite/gcc.dg/debug/dwarf2/array-1.c (nonexistent)
+++ gcc/testsuite/gcc.dg/debug/dwarf2/array-1.c (revision 276403)
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-gdwarf-2 -dA" } */
+extern int array[];
+
+int array[42];
+
+/* Verify that we get two DW_TAG_subtrange_type (each with an abbrev),
+ but only one DW_AT_upper_bound. */
+/* { dg-final { scan-assembler-times " DW_TAG_subrange_type" 4 } } */
+/* { dg-final { scan-assembler-times " DW_AT_upper_bound" 1 } } */
Index: gcc/testsuite/gcc.dg/debug/dwarf2/array-3.c
===================================================================
--- gcc/testsuite/gcc.dg/debug/dwarf2/array-3.c (nonexistent)
+++ gcc/testsuite/gcc.dg/debug/dwarf2/array-3.c (revision 276403)
@@ -0,0 +1,8 @@
+/* { dg-do compile } */
+/* { dg-options "-gdwarf-2 -dA" } */
+int array[] = { 0, 1, 2 };
+
+/* Verify that we get only one DW_TAG_subtrange_type (plus abbrev)
+ with DW_AT_upper_bound. */
+/* { dg-final { scan-assembler-times " DW_TAG_subrange_type" 2 } } */
+/* { dg-final { scan-assembler-times " DW_AT_upper_bound" 1 } } */
Index: gcc/testsuite/g++.dg/debug/dwarf2/array-1.C
===================================================================
--- gcc/testsuite/g++.dg/debug/dwarf2/array-1.C (nonexistent)
+++ gcc/testsuite/g++.dg/debug/dwarf2/array-1.C (revision 276403)
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-gdwarf-2 -dA" } */
+struct S
+{
+ static int array[];
+};
+
+int S::array[42];
+
+/* Verify that we get two DW_TAG_subrange_type, only one of which with
+ a DW_AT_upper_bound. */
+/* { dg-final { scan-assembler-times " DW_TAG_subrange_type" 4 } } */
+/* { dg-final { scan-assembler-times " DW_AT_upper_bound" 1 } } */
Index: gcc/testsuite/g++.dg/debug/dwarf2/array-2.C
===================================================================
--- gcc/testsuite/g++.dg/debug/dwarf2/array-2.C (nonexistent)
+++ gcc/testsuite/g++.dg/debug/dwarf2/array-2.C (revision 276403)
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-gdwarf-2 -dA" } */
+struct S
+{
+ typedef int i_t;
+ static i_t array[42];
+};
+
+int S::array[42];
+
+/* Verify that we get two DW_TAG_subrange_type (plus abbrev), and two
+ DW_AT_upper_bound, because a different symbolic name is used for
+ the array element type. */
+/* { dg-final { scan-assembler-times " DW_TAG_subrange_type" 3 } } */
+/* { dg-final { scan-assembler-times " DW_AT_upper_bound" 2 } } */
Index: gcc/testsuite/g++.dg/debug/dwarf2/array-3.C
===================================================================
--- gcc/testsuite/g++.dg/debug/dwarf2/array-3.C (nonexistent)
+++ gcc/testsuite/g++.dg/debug/dwarf2/array-3.C (revision 276403)
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-gdwarf-2 -dA" } */
+struct S
+{
+ S() {}
+ ~S() {}
+ static const S array[2];
+};
+
+const S S::array[2] = { S(), S() };
+
+/* Verify that we get only one DW_TAG_subrange_type (plus the abbrev),
+ and one DW_AT_upper_bound (non-abbrev), because the array
+ definition loses the readonly wrapper for the array type because of
+ the dynamic initializers. The const types are 4: S, S*, int, and
+ S[4], plus the abbrev. A const version of S[4] doesn't make sense,
+ but we output it. */
+/* { dg-final { scan-assembler-times " DW_TAG_const_type" 5 } } */
+/* { dg-final { scan-assembler-times " DW_TAG_subrange_type" 2 } } */
+/* { dg-final { scan-assembler-times " DW_AT_upper_bound" 1 } } */
Index: gcc/testsuite/g++.dg/debug/dwarf2/array-0.C
===================================================================
--- gcc/testsuite/g++.dg/debug/dwarf2/array-0.C (nonexistent)
+++ gcc/testsuite/g++.dg/debug/dwarf2/array-0.C (revision 276403)
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-options "-gdwarf-2 -dA" } */
+struct S
+{
+ static int array[42];
+};
+
+int S::array[42];
+
+/* Verify that we get only one DW_TAG_subrange_type with a
+ DW_AT_upper_bound. */
+/* { dg-final { scan-assembler-times " DW_TAG_subrange_type" 2 } } */
+/* { dg-final { scan-assembler-times " DW_AT_upper_bound" 1 } } */
Index: gcc/testsuite/g++.dg/debug/dwarf2/array-4.C
===================================================================
--- gcc/testsuite/g++.dg/debug/dwarf2/array-4.C (nonexistent)
+++ gcc/testsuite/g++.dg/debug/dwarf2/array-4.C (revision 276403)
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-gdwarf-2 -dA" } */
+struct S
+{
+ S() {}
+ ~S() {}
+};
+
+const S array[2] = { S(), S() };
+
+/* Like array-3, but with a non-member array without a separate
+ declaration, to check that we don't issue the nonsensical
+ DW_TAG_const_type used by the member array declaration there. */
+/* { dg-final { scan-assembler-times " DW_TAG_const_type" 4 } } */
+/* { dg-final { scan-assembler-times " DW_TAG_subrange_type" 2 } } */
+/* { dg-final { scan-assembler-times " DW_AT_upper_bound" 1 } } */
Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c (revision 276402)
+++ gcc/dwarf2out.c (revision 276403)
@@ -23705,6 +23705,34 @@ local_function_static (tree decl)
&& TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL;
}
+/* Return true iff DECL overrides (presumably completes) the type of
+ OLD_DIE within CONTEXT_DIE. */
+
+static bool
+override_type_for_decl_p (tree decl, dw_die_ref old_die,
+ dw_die_ref context_die)
+{
+ tree type = TREE_TYPE (decl);
+ int cv_quals;
+
+ if (decl_by_reference_p (decl))
+ {
+ type = TREE_TYPE (type);
+ cv_quals = TYPE_UNQUALIFIED;
+ }
+ else
+ cv_quals = decl_quals (decl);
+
+ dw_die_ref type_die = modified_type_die (type,
+ cv_quals | TYPE_QUALS (type),
+ false,
+ context_die);
+
+ dw_die_ref old_type_die = get_AT_ref (old_die, DW_AT_type);
+
+ return type_die != old_type_die;
+}
+
/* Generate a DIE to represent a declared data object.
Either DECL or ORIGIN must be non-null. */
@@ -23957,7 +23985,9 @@ gen_variable_die (tree decl, tree origin
&& !DECL_ABSTRACT_P (decl_or_origin)
&& variably_modified_type_p (TREE_TYPE (decl_or_origin),
decl_function_context
- (decl_or_origin))))
+ (decl_or_origin)))
+ || (old_die && specialization_p
+ && override_type_for_decl_p (decl_or_origin, old_die, context_die)))
{
tree type = TREE_TYPE (decl_or_origin);
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