| 1 | // XFAIL: * |
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| 2 | // Incorrect location for variable "param", see PR48719. |
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| 3 | |
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| 4 | // REQUIRES: lldb |
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| 5 | // UNSUPPORTED: system-windows |
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| 6 | // RUN: %clang -std=gnu11 -O3 -glldb %s -o %t |
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| 7 | // RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s |
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| 8 | |
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| 9 | // 1. param is escaped by inlineme(¶m) so it is not promoted by |
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| 10 | // SROA/mem2reg. |
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| 11 | // 2. InstCombine's LowerDbgDeclare converts the dbg.declare to a set of |
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| 12 | // dbg.values. |
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| 13 | // 3. inlineme(¶m) is inlined. |
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| 14 | // 4. SROA/mem2reg fully promotes param. It does not insert a dbg.value after the |
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| 15 | // PHI it inserts which merges the values out of entry and if.then in the |
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| 16 | // sucessor block. This behaviour is inconsistent. If the dbg.declare was |
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| 17 | // still around (i.e. if param was promoted in the first round of mem2reg |
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| 18 | // BEFORE LowerDbgDeclare) we would see a dbg.value insered for the PHI. |
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| 19 | // 5. JumpThreading removes the if.then block, changing entry to |
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| 20 | // unconditionally branch to if.end. |
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| 21 | // 6. SimplifyCFG stitches entry and if.end together. |
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| 22 | |
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| 23 | // The debug info is not updated to account for the merged value prior to or |
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| 24 | // during JumpThreading/SimplifyCFG so we end up seeing param=5 for the entire |
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| 25 | // function, when we'd expect to see param=10 when stepping onto fluff(). |
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| 26 | |
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| 27 | __attribute__((always_inline)) |
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| 28 | int inlineme(int* p) { return *p * 2; } |
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| 29 | |
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| 30 | __attribute__((optnone)) |
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| 31 | void fluff() {} |
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| 32 | |
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| 33 | __attribute__((noinline)) |
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| 34 | int fun(int param) { |
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| 35 | if (param) |
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| 36 | param = inlineme(p: ¶m); |
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| 37 | fluff(); // DexLabel('s0') |
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| 38 | return param; |
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| 39 | } |
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| 40 | |
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| 41 | int main() { |
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| 42 | return fun(param: 5); |
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| 43 | } |
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| 44 | |
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| 45 | // DexExpectWatchValue('param', 10, on_line=ref('s0')) |
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| 46 | |
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