44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
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// XFAIL: *
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// Incorrect location for variable "parama", see PR48719.
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// REQUIRES: lldb
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// UNSUPPORTED: system-windows
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// RUN: %clang -std=gnu11 -O3 -glldb %s -o %t
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// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
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// 1. parama is escaped by esc(¶ma) 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 (tracking the stored SSA values).
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// 3. InstCombine replaces the two stores to parama's alloca (the initial
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// parameter register store in entry and the assignment in if.then) with a
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// PHI+store in the common sucessor.
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// 4. SimplifyCFG folds the blocks together and converts the PHI to a
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// select.
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// The debug info is not updated to account for the merged value in the
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// sucessor prior to SimplifyCFG when it exists as a PHI, or during when it
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// becomes a select. As a result we see parama=5 for the entire function, when
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// we'd expect to see param=20 when stepping onto fluff().
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__attribute__((optnone))
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void esc(int* p) {}
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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 parama, int paramb) {
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if (parama)
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parama = paramb;
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fluff(); // DexLabel('s0')
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esc(¶ma);
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return 0;
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}
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int main() {
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return fun(5, 20);
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}
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// DexExpectWatchValue('parama', 20, on_line=ref('s0'))
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