https://llvm.org/bugs/show_bug.cgi?id=30789
Bug ID: 30789
Summary: Watchpoint::SetEnabled & therefore
SBWatchpoint::SetEnabled don't actually disable a
watchpoint
Product: lldb
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: jing...@apple.com
CC: llvm-b...@lists.llvm.org
Classification: Unclassified
This is on MacOS x86_64:
Build the test case in functionalities/watchpoint/watchpoint_command/command
and do:
(lldb) b s -p "Set break"
Breakpoint 2: where = a.out`main + 63 at main.cpp:22, address =
0x0000000100000ecf
(lldb) run
Process 98597 launched: 'a.out' (x86_64)
&global=0x100001018
Process 98597 stopped
* thread #1: tid = 0x1740788, function: main , stop reason = breakpoint 2.1
frame #0: 0x0000000100000ecf a.out`main at main.cpp:22
19 int main(int argc, char** argv) {
20 int local = 0;
21 printf("&global=%p\n", &global);
-> 22 printf("about to write to 'global'...\n"); // Set break point at
this line.
23 for (int i = 0; i < 10; ++i)
24 modify(global);
25
(lldb) watch set variable global
Watchpoint created: Watchpoint 1: addr = 0x100001018 size = 4 state = enabled
type = w
declare @ 'main.cpp:12'
watchpoint spec = 'global'
new value: 0
(lldb) c
Process 98597 resuming
about to write to 'global'...
Watchpoint 1 hit:
old value: 0
new value: 1
Process 98597 stopped
* thread #1: tid = 0x1740788, function: modify(int&) , stop reason = watchpoint
1
frame #0: 0x0000000100000f53 a.out`modify(int&) at main.cpp:17
14
15 static void modify(int32_t &var) {
16 ++var;
-> 17 }
18
19 int main(int argc, char** argv) {
20 int local = 0;
(lldb) script lldb.target.FindWatchpointByID(1).SetEnabled(False)
(lldb) watch list
Number of supported hardware watchpoints: 4
Current watchpoints:
Watchpoint 1: addr = 0x100001018 size = 4 state = disabled type = w
declare @ 'main.cpp:12'
watchpoint spec = 'global'
old value: 0
new value: 1
(lldb) c
Process 98597 resuming
Process 98597 stopped
* thread #1: tid = 0x1740788, function: modify(int&) , stop reason =
EXC_BREAKPOINT (code=EXC_I386_SGL, subcode=0x100001018)
frame #0: 0x0000000100000f53 a.out`modify(int&) at main.cpp:17
14
15 static void modify(int32_t &var) {
16 ++var;
-> 17 }
18
19 int main(int argc, char** argv) {
20 int local = 0;
So the watchpoint says it was disabled, but it actually didn't get disabled,
and we hit it on continue.
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