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[PATCH 2/2] Fix implptr-optimized-out.exp fail in thumb mode
- From: Yao Qi <yao at codesourcery dot com>
- To: <gdb-patches at sourceware dot org>
- Date: Mon, 29 Sep 2014 08:52:01 +0800
- Subject: [PATCH 2/2] Fix implptr-optimized-out.exp fail in thumb mode
- Authentication-results: sourceware.org; auth=none
- References: <1411951921-16168-1-git-send-email-yao at codesourcery dot com>
Hi,
I see the fail in gdb.dwarf2/implptr-optimized-out.exp in thumb mode
(gdb) p p->f^M
No symbol "p" in current context.^M
(gdb) FAIL: gdb.dwarf2/implptr-optimized-out.exp: p p->f
In thumb mode, the lsb of references to 'main' in the assembly
(produced by dwarf assember) is set, so the generated debug
information is incorrect.
in this patch, we add a label main_label inside function main. Linker
doesn't set its lsb in thumb mode, and we can get function main's
address by 'main_label - $main_label_offset'.
gdb/testsuite:
2014-09-29 Yao Qi <yao@codesourcery.com>
* gdb.dwarf2/implptr-optimized-out.exp: Compile main.c to object.
Calculate the offset of main_label to main. Compile the generated
asm file and link the executable.
(Dwarf::assemble): Get address of main by
main_label - $main_label_offset.
---
gdb/testsuite/gdb.dwarf2/implptr-optimized-out.exp | 39 ++++++++++++++++++++--
1 file changed, 36 insertions(+), 3 deletions(-)
diff --git a/gdb/testsuite/gdb.dwarf2/implptr-optimized-out.exp b/gdb/testsuite/gdb.dwarf2/implptr-optimized-out.exp
index 649f52d..534bed0 100644
--- a/gdb/testsuite/gdb.dwarf2/implptr-optimized-out.exp
+++ b/gdb/testsuite/gdb.dwarf2/implptr-optimized-out.exp
@@ -22,9 +22,35 @@ if {![dwarf2_support]} {
standard_testfile main.c .S
set executable ${testfile}
+if {[gdb_compile ${srcdir}/${subdir}/${srcfile} ${binfile}1.o \
+ object {}] != ""} {
+ return -1
+}
+# Start GDB and load object file, compute the offset from main to
+# main_label which are needed in the Dwarf Assembler below.
+clean_restart ${binfile}1.o
+
+set main_label_offset ""
+set test "p main_label - main"
+gdb_test_multiple $test $test {
+ -re ".* = ($decimal)\r\n$gdb_prompt $" {
+ set main_label_offset $expect_out(1,string)
+ }
+}
+
+if { $main_label_offset == "" } {
+ # Bail out here, because we can't do the following tests if
+ # $main_label_offset is unknown.
+ return -1
+}
+
+gdb_exit
+
# Create the DWARF.
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
+ global main_label_offset
+
cu { version 3 } {
compile_unit {
{producer "GNU C 4.4.3"}
@@ -52,8 +78,8 @@ Dwarf::assemble $asm_file {
subprogram {
{name main}
- {low_pc main addr}
- {high_pc main+0x100 addr}
+ {low_pc "main_label - $main_label_offset" addr}
+ {high_pc "main_label - $main_label_offset + 0x100" addr}
{type :$int_label}
{external 1 flag}
} {
@@ -80,10 +106,17 @@ Dwarf::assemble $asm_file {
}
}
-if [prepare_for_testing ${testfile}.exp $executable "${asm_file} ${srcfile}" {}] {
+if {[gdb_compile $asm_file ${binfile}0.o object {}] != ""} {
return -1
}
+if {[gdb_compile [list ${binfile}0.o ${binfile}1.o] \
+ "${binfile}" executable {}] != ""} {
+ return -1
+}
+
+clean_restart ${testfile}
+
# DW_OP_GNU_implicit_pointer implementation requires a valid frame.
if ![runto_main] {
return -1
--
1.9.3