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gdb: Fix failure in gdb.base/complex-parts.exp for x86-32 

The x86-32 ABI specifies 96-bit long double, this was causing a
failure on the test gdb.base/complex-parts.exp.

The problem is that GDB tries to find a builtin floating point type of
the correct size in order to reuse the name of that type as the name
for the components of the complex type being built.

Previously GDB was only aware of floating point types sized 32, 64, or
128 bits.  This patch teaches GDB how to handle 96 bit floating point
type.

gdb/ChangeLog:

	* dwarf2read.c (dwarf2_init_complex_target_type): Handle complex
	target types of size 96-bits, add some additional comments, and
	check that the builtin type we found was the correct size.
This commit is contained in:
Andrew Burgess 2019-04-13 00:54:16 +01:00
parent 9c9f1b1f39
commit 35add35e85
2 changed files with 16 additions and 0 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2019-04-13 Andrew Burgess <andrew.burgess@embecosm.com>
* dwarf2read.c (dwarf2_init_complex_target_type): Handle complex
target types of size 96-bits, add some additional comments, and
check that the builtin type we found was the correct size.
2019-04-12 Eli Zaretskii <eliz@gnu.org>
* utils.c (prompt_for_continue): Don't restore the styling at the

10
gdb/dwarf2read.c
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@ -17546,6 +17546,9 @@ dwarf2_init_complex_target_type (struct dwarf2_cu *cu,
gdbarch *gdbarch = get_objfile_arch (objfile);
struct type *tt = nullptr;
/* Try to find a suitable floating point builtin type of size BITS.
We're going to use the name of this type as the name for the complex
target type that we are about to create. */
switch (bits)
{
case 32:
@ -17554,11 +17557,18 @@ dwarf2_init_complex_target_type (struct dwarf2_cu *cu,
case 64:
tt = builtin_type (gdbarch)->builtin_double;
break;
case 96: /* The x86-32 ABI specifies 96-bit long double. */
case 128:
tt = builtin_type (gdbarch)->builtin_long_double;
break;
}
/* If the type we found doesn't match the size we were looking for, then
pretend we didn't find a type at all, the complex target type we
create will then be nameless. */
if (TYPE_LENGTH (tt) * TARGET_CHAR_BIT != bits)
tt = nullptr;
const char *name = (tt == nullptr) ? nullptr : TYPE_NAME (tt);
return dwarf2_init_float_type (objfile, bits, name, name_hint);
}