1 // XFAIL: *
2 // Incorrect location for variable "param", see PR48719.
3 
4 // REQUIRES: lldb
5 // UNSUPPORTED: system-windows
6 // RUN: %dexter --fail-lt 1.0 -w --debugger lldb \
7 // RUN:     --builder 'clang-c'  --cflags "-O3 -glldb" -- %s
8 
9 // 1. param is escaped by inlineme(&param) so it is not promoted by
10 //    SROA/mem2reg.
11 // 2. InstCombine's LowerDbgDeclare converts the dbg.declare to a set of
12 //    dbg.values.
13 // 3. inlineme(&param) is inlined.
14 // 4. SROA/mem2reg fully promotes param. It does not insert a dbg.value after the
15 //    PHI it inserts which merges the values out of entry and if.then in the
16 //    sucessor block. This behaviour is inconsistent. If the dbg.declare was
17 //    still around (i.e.  if param was promoted in the first round of mem2reg
18 //    BEFORE LowerDbgDeclare) we would see a dbg.value insered for the PHI.
19 // 5. JumpThreading removes the if.then block, changing entry to
20 //    unconditionally branch to if.end.
21 // 6. SimplifyCFG stitches entry and if.end together.
22 
23 // The debug info is not updated to account for the merged value prior to or
24 // during JumpThreading/SimplifyCFG so we end up seeing param=5 for the entire
25 // function, when we'd expect to see param=10 when stepping onto fluff().
26 
27 __attribute__((always_inline))
28 int inlineme(int* p) { return *p * 2; }
29 
30 __attribute__((optnone))
31 void fluff() {}
32 
33 __attribute__((noinline))
34 int fun(int param) {
35   if (param)
36     param = inlineme(&param);
37   fluff();           // DexLabel('s0')
38   return param;
39 }
40 
41 int main() {
42   return fun(5);
43 }
44 
45 // DexExpectWatchValue('param', 10, on_line=ref('s0'))
46