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* [gcc r11-8893] dwarf2out: Emit DW_AT_location for global register vars during early dwarf [PR101905]
@ 2021-08-23 9:55 Jakub Jelinek
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From: Jakub Jelinek @ 2021-08-23 9:55 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:513c543bb5d97cc59ba393f2f0612324a789c50e
commit r11-8893-g513c543bb5d97cc59ba393f2f0612324a789c50e
Author: Jakub Jelinek <jakub@redhat.com>
Date: Mon Aug 23 11:50:14 2021 +0200
dwarf2out: Emit DW_AT_location for global register vars during early dwarf [PR101905]
The following patch emits DW_AT_location for global register variables
already during early dwarf, since usually late_global_decl hook isn't even
called for those, as nothing needs to be emitted for them.
2021-08-23 Jakub Jelinek <jakub@redhat.com>
PR debug/101905
* dwarf2out.c (gen_variable_die): Add DW_AT_location for global
register variables already during early_dwarf if possible.
* gcc.dg/guality/pr101905.c: New test.
(cherry picked from commit b284053bb75661fc1bf13c275f3ba5364bb17608)
Diff:
---
gcc/dwarf2out.c | 21 ++++++++++++++++++++-
gcc/testsuite/gcc.dg/guality/pr101905.c | 15 +++++++++++++++
2 files changed, 35 insertions(+), 1 deletion(-)
diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 54c6c326d49..7296cdb52fb 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -24254,7 +24254,26 @@ gen_variable_die (tree decl, tree origin, dw_die_ref context_die)
&& DECL_RTL_SET_P (decl_or_origin))))
{
if (early_dwarf)
- add_pubname (decl_or_origin, var_die);
+ {
+ add_pubname (decl_or_origin, var_die);
+ /* For global register variables, emit DW_AT_location if possible
+ already during early_dwarf, as late_global_decl won't be usually
+ called. */
+ if (DECL_HARD_REGISTER (decl_or_origin)
+ && TREE_STATIC (decl_or_origin)
+ && !decl_by_reference_p (decl_or_origin)
+ && !get_AT (var_die, DW_AT_location)
+ && !get_AT (var_die, DW_AT_const_value)
+ && DECL_RTL_SET_P (decl_or_origin)
+ && REG_P (DECL_RTL (decl_or_origin)))
+ {
+ dw_loc_descr_ref descr
+ = reg_loc_descriptor (DECL_RTL (decl_or_origin),
+ VAR_INIT_STATUS_INITIALIZED);
+ if (descr)
+ add_AT_loc (var_die, DW_AT_location, descr);
+ }
+ }
else
add_location_or_const_value_attribute (var_die, decl_or_origin,
decl == NULL);
diff --git a/gcc/testsuite/gcc.dg/guality/pr101905.c b/gcc/testsuite/gcc.dg/guality/pr101905.c
new file mode 100644
index 00000000000..71b7516905b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/guality/pr101905.c
@@ -0,0 +1,15 @@
+/* { dg-do run { target { { i?86-*-* x86_64-*-* } && lp64 } } } */
+/* { dg-options "-g -ffixed-r15" } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O0" } } */
+
+register unsigned long long regVar asm ("r15");
+
+int
+main()
+{
+ regVar = 0xdeadbeefcafebabeULL;
+ asm ("nop" : "+r" (regVar));
+ asm volatile ("nop"); /* { dg-final { gdb-test . "regVar" "0xdeadbeefcafebabeULL" } } */
+ asm volatile ("nop" : : "r" (regVar));
+ return 0;
+}
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