forked from OSchip/llvm-project
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
// XFAIL:*
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//// Suboptimal coverage, see inlined comments.
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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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//// Adapted from https://bugs.llvm.org/show_bug.cgi?id=34136#c4
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int g;
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__attribute__((__noinline__))
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void esc(int* p) {
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g = *p;
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*p = 5;
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}
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__attribute__((__noinline__))
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void thing(int x) {
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g = x;
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}
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__attribute__((__noinline__))
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int fun(int param) {
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esc(¶m); //// alloca is live until here DexLabel('s1')
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if (param == 0) { //// end of alloca live range
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//// param is now a constant, but without lowering to dbg.value we can't
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//// capture that and would still point to the stack slot that may even have
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//// been reused by now.
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////
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//// Right now we get suboptimal coverage for x86: the param load below is
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//// CSE'd with the if condition.
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//// Instcombine runs LowerDbgDeclare and inserts a dbg.value after the load.
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//// SelectionDAG combines the load and cmp. We go from this IR:
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//// %0 = load i32, i32* %param.addr, align 4, !dbg !42, !tbaa !20
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//// call void @llvm.dbg.value(metadata i32 %0, ...
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//// %cmp = icmp eq i32 %0, 0, !dbg !44
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//// to this MIR:
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//// DBG_VALUE $noreg, $noreg, !"param"...
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//// CMP32mi8 %param.addr, 1, $noreg, 0, $noreg, 0, implicit-def $eflags, debug-location !44
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thing(param);
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}
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return 0; // DexLabel('s2')
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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', '5', from_line='s1', to_line='s2')
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