| 1 | // XFAIL: !system-darwin || !target-aarch64 |
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| 2 | //// Suboptimal coverage, see inlined comments. |
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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 | //// Adapted from https://bugs.llvm.org/show_bug.cgi?id=34136#c4 |
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| 10 | |
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| 11 | int g; |
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| 12 | |
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| 13 | __attribute__((__noinline__)) |
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| 14 | void esc(int* p) { |
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| 15 | g = *p; |
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| 16 | *p = 5; |
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| 17 | } |
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| 18 | |
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| 19 | __attribute__((__noinline__)) |
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| 20 | void thing(int x) { |
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| 21 | g = x; |
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| 22 | } |
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| 23 | |
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| 24 | __attribute__((__noinline__)) |
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| 25 | int fun(int param) { |
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| 26 | esc(p: ¶m); //// alloca is live until here DexLabel('s1') |
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| 27 | if (param == 0) { //// end of alloca live range |
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| 28 | //// param is now a constant, but without lowering to dbg.value we can't |
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| 29 | //// capture that and would still point to the stack slot that may even have |
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| 30 | //// been reused by now. |
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| 31 | //// |
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| 32 | //// Right now we get suboptimal coverage for x86: the param load below is |
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| 33 | //// CSE'd with the if condition. |
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| 34 | //// Instcombine runs LowerDbgDeclare and inserts a dbg.value after the load. |
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| 35 | //// SelectionDAG combines the load and cmp. We go from this IR: |
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| 36 | //// %0 = load i32, i32* %param.addr, align 4, !dbg !42, !tbaa !20 |
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| 37 | //// call void @llvm.dbg.value(metadata i32 %0, ... |
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| 38 | //// %cmp = icmp eq i32 %0, 0, !dbg !44 |
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| 39 | //// to this MIR: |
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| 40 | //// DBG_VALUE $noreg, $noreg, !"param"... |
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| 41 | //// CMP32mi8 %param.addr, 1, $noreg, 0, $noreg, 0, implicit-def $eflags, debug-location !44 |
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| 42 | thing(x: param); |
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| 43 | } |
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| 44 | return 0; // DexLabel('s2') |
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| 45 | } |
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| 46 | |
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| 47 | int main() { |
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| 48 | return fun(param: 5); |
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| 49 | } |
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| 50 | |
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| 51 | // DexExpectWatchValue('param', '5', from_line=ref('s1'), to_line=ref('s2')) |
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| 52 | |
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| 53 | |
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