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[cherry-pick][stable/20240723] [lldb][FrameRecognizer] Display the first non-std frame on verbose_trap #9290

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merged 1 commit into from
Sep 19, 2024

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This attempts to improve user-experience when LLDB stops on a verbose_trap. Currently if a __builtin_verbose_trap triggers, we display the first frame above the call to the verbose_trap. So in the newly added test case, we would've previously stopped here:

(lldb) run
Process 28095 launched: '/Users/michaelbuch/a.out' (arm64)
Process 28095 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = Bounds error: out-of-bounds access
    frame #1: 0x0000000100003f5c a.out`std::__1::vector<int>::operator[](this=0x000000016fdfebef size=0, (null)=10) at verbose_trap.cpp:6:9
   3    template <typename T>
   4    struct vector {
   5        void operator[](unsigned) {
-> 6            __builtin_verbose_trap("Bounds error", "out-of-bounds access");
   7        }
   8    };

After this patch, we would stop in the first non-std frame:

(lldb) run
Process 27843 launched: '/Users/michaelbuch/a.out' (arm64)
Process 27843 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = Bounds error: out-of-bounds access
    frame #2: 0x0000000100003f44 a.out`g() at verbose_trap.cpp:14:5
   11
   12   void g() {
   13       std::vector<int> v;
-> 14       v[10];
   15   }
   16

rdar://134490328
(cherry picked from commit bca5073)

…ap (llvm#108825)

This attempts to improve user-experience when LLDB stops on a
verbose_trap. Currently if a `__builtin_verbose_trap` triggers, we
display the first frame above the call to the verbose_trap. So in the
newly added test case, we would've previously stopped here:
```
(lldb) run
Process 28095 launched: '/Users/michaelbuch/a.out' (arm64)
Process 28095 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = Bounds error: out-of-bounds access
    frame #1: 0x0000000100003f5c a.out`std::__1::vector<int>::operator[](this=0x000000016fdfebef size=0, (null)=10) at verbose_trap.cpp:6:9
   3    template <typename T>
   4    struct vector {
   5        void operator[](unsigned) {
-> 6            __builtin_verbose_trap("Bounds error", "out-of-bounds access");
   7        }
   8    };
```

After this patch, we would stop in the first non-`std` frame:
```
(lldb) run
Process 27843 launched: '/Users/michaelbuch/a.out' (arm64)
Process 27843 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = Bounds error: out-of-bounds access
    frame #2: 0x0000000100003f44 a.out`g() at verbose_trap.cpp:14:5
   11
   12   void g() {
   13       std::vector<int> v;
-> 14       v[10];
   15   }
   16
```

rdar://134490328
(cherry picked from commit bca5073)
@Michael137 Michael137 merged commit 5b47fb3 into stable/20240723 Sep 19, 2024
@Michael137 Michael137 deleted the lldb/verbose-trap-ux-to-20240723 branch September 19, 2024 09:25
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