File gdb-tui-fix-wmaybe-uninitialized-in-tui_find_di... of Package gdb

Overview Repositories Revisions Requests Users Attributes Meta

File gdb-tui-fix-wmaybe-uninitialized-in-tui_find_disasse.patch of Package gdb (Revision 8274cc1395b8fd79f381c478ccf2862d)

Currently displaying revision 8274cc1395b8fd79f381c478ccf2862d , Show latest

From 0f2bdd8648e47e10334f8cc8e47b277d4064d0a2 Mon Sep 17 00:00:00 2001
From: Tom de Vries <tdevries@suse.de>
Date: Mon, 13 Nov 2023 09:31:20 +0100
Subject: [PATCH 3/6] [gdb/tui] Fix Wmaybe-uninitialized in
 tui_find_disassembly_address
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

When building gdb with -O2, we run into:
...
gdb/tui/tui-disasm.c: In function ‘CORE_ADDR tui_find_disassembly_address \
  (gdbarch*, CORE_ADDR, int)’:
gdb/tui/tui-disasm.c:293:7: warning: ‘last_addr’ may be used uninitialized \
  in this function [-Wmaybe-uninitialized]
       if (last_addr < pc)
       ^~
...

The warning triggers since commit 72535eb14bd ("[gdb/tui] Fix segfault in
tui_find_disassembly_address").

Fix the warning by ensuring that last_addr is initialized at the point of
use:
...
+      last_addr = asm_lines.back ().addr;
       if (last_addr < pc)
...

Tested on x86_64-linux.
---
 gdb/tui/tui-disasm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/tui/tui-disasm.c b/gdb/tui/tui-disasm.c
index 03c78aa1291..bbbc92c8183 100644
--- a/gdb/tui/tui-disasm.c
+++ b/gdb/tui/tui-disasm.c
@@ -281,7 +281,6 @@ tui_find_disassembly_address (struct gdbarch *gdbarch, CORE_ADDR pc, int from)
 	  /* Take the best possible match we have.  */
 	  new_low = *possible_new_low;
 	  next_addr = tui_disassemble (gdbarch, asm_lines, new_low, max_lines);
-	  last_addr = asm_lines.back ().addr;
 	  gdb_assert (asm_lines.size () >= max_lines);
 	}
 
@@ -290,6 +289,7 @@ tui_find_disassembly_address (struct gdbarch *gdbarch, CORE_ADDR pc, int from)
 	 We keep the disassembled instructions in the 'lines' window
 	 and shift it downward (increasing its addresses).  */
       int pos = max_lines - 1;
+      last_addr = asm_lines.back ().addr;
       if (last_addr < pc)
 	do
 	  {
-- 
2.35.3

Places

File gdb-tui-fix-wmaybe-uninitialized-in-tui_find_disasse.patch of Package gdb (Revision 8274cc1395b8fd79f381c478ccf2862d)

Places