https://llvm.org/bugs/show_bug.cgi?id=27257
Bug ID: 27257
Summary: Integer division expression not correctly evaluated
Product: lldb
Version: 3.8
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-...@lists.llvm.org
Reporter: tgfb...@me.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16180
--> https://llvm.org/bugs/attachment.cgi?id=16180&action=edit
output with logging enabled.
In lldb bundled with Xcode 7.3 and Swift 2.2 Release for Ubuntu 14.04, integer
division expression is not correctly evaluated.
When debugging the following code:
$ cat /tmp/a.cpp
#include <cstdio>
int main() {
int b = 800;
printf("%d\n", b);
return 0;
}
$ clang -o /tmp/x -g /tmp/a.cpp
, integer division in expr is not evaluated correctly, while floating point
division seems to be good:
$ lldb /tmp/x
(lldb) target create "/tmp/x"
Current executable set to '/tmp/x' (x86_64).
(lldb) b 4
Breakpoint 1: where = x`main + 29 at a.cpp:4, address = 0x0000000100000f6d
(lldb) run
Process 46865 launched: '/tmp/x' (x86_64)
Process 46865 stopped
* thread #1: tid = 0x5e9061, 0x0000000100000f6d x`main + 29 at a.cpp:4, queue =
'com.apple.main-thread', stop reason = breakpoint 1.1
frame #0: 0x0000000100000f6d x`main + 29 at a.cpp:4
1 #include <cstdio>
2 int main() {
3 int b = 800;
-> 4 printf("%d\n", b);
5 return 0;
6 }
(lldb) p b / 1
(int) $0 = 0
(lldb) p b / 2
(int) $1 = 0
(lldb) p b / 6
(int) $2 = 1
(lldb) p b / 13
(int) $3 = 1
(lldb) p b / 4.0
(double) $4 = 200
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