File gdb-symtab-read-cu-base-address-for-enqueued-cu.patch of Package gdb.17657
[gdb/symtab] Read CU base address for enqueued CU
Consider the test-case contained in this patch. It consists of
two CUs:
- cu1, containing a DW_TAG_variable DIE foo
- cu2, containing a DW_TAG_base_type DIE int
where the variable foo has type int, in other words, there's an inter-CU
reference.
When expanding the symtab for cu1, expansion of the symtab for cu2 is
enqueued, and later processed by process_full_comp_unit. However, processing
of .debug_ranges fails because the range is specified relative to a base
address which is considered not to be present because
!cu->base_address.has_value (), and we run into this case in
dwarf2_ranges_process:
...
if (!base.has_value ())
{
/* We have no valid base address for the ranges
data. */
complaint (_("Invalid .debug_ranges data (no base address)"));
return 0;
}
...
Fix this in process_full_comp_unit by setting cu->base_address.
Tested on x86_64-linux.
gdb/ChangeLog:
2020-10-26 Tom de Vries <tdevries@suse.de>
* dwarf2/read.c (process_full_comp_unit): Call
dwarf2_find_base_address.
gdb/testsuite/ChangeLog:
2020-10-26 Tom de Vries <tdevries@suse.de>
* gdb.dwarf2/enqueued-cu-base-addr.exp: New file.
---
gdb/dwarf2/read.c | 2 +
.../gdb.dwarf2/enqueued-cu-base-addr.exp | 112 ++++++++++++++++++
4 files changed, 123 insertions(+)
create mode 100644 gdb/testsuite/gdb.dwarf2/enqueued-cu-base-addr.exp
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 436a116dc80..e1c528f44d2 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -9929,6 +9929,8 @@ process_full_comp_unit (dwarf2_cu *cu, enum language pretend_language)
cu->language = pretend_language;
cu->language_defn = language_def (cu->language);
+ dwarf2_find_base_address (cu->dies, cu);
+
/* Do line number decoding in read_file_scope () */
process_die (cu->dies, cu);
diff --git a/gdb/testsuite/gdb.dwarf2/enqueued-cu-base-addr.exp b/gdb/testsuite/gdb.dwarf2/enqueued-cu-base-addr.exp
new file mode 100644
index 00000000000..77fe6ff5e94
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/enqueued-cu-base-addr.exp
@@ -0,0 +1,112 @@
+# Copyright 2020 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Check whether .debug_ranges is correctly read in during symtab expansion.
+
+load_lib dwarf.exp
+
+# This test can only be run on targets which support DWARF-2 and use gas.
+if {![dwarf2_support]} {
+ return 0
+};
+
+standard_testfile main.c .S
+
+set executable ${testfile}
+set asm_file [standard_output_file ${srcfile2}]
+
+# We need to know the size of integer types in order to write some of the
+# debugging info we'd like to generate.
+if [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] {
+ return -1
+}
+
+# Create the DWARF.
+Dwarf::assemble $asm_file {
+ global srcdir subdir srcfile
+
+ declare_labels int_label
+ declare_labels ranges_label
+
+ set main_func \
+ [function_range main [list ${srcdir}/${subdir}/$srcfile]]
+
+ cu {} {
+ compile_unit {
+ {language @DW_LANG_C_plus_plus}
+ {name "cu1"}
+ } {
+ DW_TAG_variable {
+ {name foo}
+ {type :$int_label}
+ {const_value 1 DW_FORM_sdata}
+ }
+ }
+ }
+
+ cu {} {
+ compile_unit {
+ {language @DW_LANG_C_plus_plus}
+ {name "cu2"}
+ {ranges ${ranges_label} sec_offset}
+ {low_pc {[lindex $main_func 0]} DW_FORM_addr}
+ } {
+ int_label: base_type {
+ {byte_size 4 udata}
+ {encoding @DW_ATE_signed}
+ {name int}
+ }
+ }
+ }
+
+ ranges {is_64 [is_64_target]} {
+ ranges_label: sequence {
+ {range 0 [lindex $main_func 1]}
+ }
+ }
+}
+
+if { [prepare_for_testing "failed to prepare" ${testfile} \
+ [list $srcfile $asm_file] {nodebug}] } {
+ return -1
+}
+
+clean_restart ${binfile}
+
+# Expand cu1. This will enqueue cu2.
+gdb_test "ptype foo" "type = int"
+
+# Now check that cu2 has an address range starting at main.
+set cu2_blockvector_re \
+ [multi_line \
+ "Symtab for file cu2 at $hex" \
+ "Read from object file \[^\r\n\]*" \
+ "Language: c\\+\\+" \
+ "" \
+ "Blockvector:" \
+ "" \
+ "block #000, \[^\r\n\]* in ($hex)..$hex" \
+ ".*"]
+gdb_test_multiple "maint print symbols -objfile $binfile" "CU addr found" {
+ -re -wrap $cu2_blockvector_re {
+ set addr $expect_out(1,string)
+ if { $addr eq "0x0" } {
+ fail "$gdb_test_name (Found 0x0)"
+ } else {
+ gdb_test "info symbol $addr" "main in section .*" \
+ $gdb_test_name
+ }
+ }
+}