forked from OSchip/llvm-project
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
// XFAIL: *
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// Incorrect location for variable "param", see PR48719.
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// REQUIRES: lldb
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// UNSUPPORTED: system-windows
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// RUN: %dexter --fail-lt 1.0 -w --debugger lldb \
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// RUN: --builder 'clang-c' --cflags "-O3 -glldb" -- %s
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// 1. param is escaped by inlineme(¶m) so it is not promoted by
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// SROA/mem2reg.
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// 2. InstCombine's LowerDbgDeclare converts the dbg.declare to a set of
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// dbg.values.
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// 3. inlineme(¶m) is inlined.
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// 4. SROA/mem2reg fully promotes param. It does not insert a dbg.value after the
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// PHI it inserts which merges the values out of entry and if.then in the
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// sucessor block. This behaviour is inconsistent. If the dbg.declare was
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// still around (i.e. if param was promoted in the first round of mem2reg
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// BEFORE LowerDbgDeclare) we would see a dbg.value insered for the PHI.
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// 5. JumpThreading removes the if.then block, changing entry to
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// unconditionally branch to if.end.
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// 6. SimplifyCFG stitches entry and if.end together.
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// The debug info is not updated to account for the merged value prior to or
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// during JumpThreading/SimplifyCFG so we end up seeing param=5 for the entire
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// function, when we'd expect to see param=10 when stepping onto fluff().
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__attribute__((always_inline))
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int inlineme(int* p) { return *p * 2; }
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__attribute__((optnone))
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void fluff() {}
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__attribute__((noinline))
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int fun(int param) {
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if (param)
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param = inlineme(¶m);
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fluff(); // DexLabel('s0')
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return param;
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}
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int main() {
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return fun(5);
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}
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// DexExpectWatchValue('param', 10, on_line='s0')
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