File: struct-dse.c

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llvm-toolchain-21 1%3A21.1.6-3
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// XFAIL:*
//// Currently, LowerDbgDeclare doesn't lower dbg.declares pointing at allocas
//// for structs.

// REQUIRES: lldb
// UNSUPPORTED: system-windows
// RUN: %clang -std=gnu11 -O2 -glldb %s -o %t
// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
//
//// Check debug-info for the escaped struct variable num is reasonable.

#include <stdio.h>
struct Nums {
  int a, b, c, d, e, f, g, h, i, j;
};
struct Nums glob;
__attribute__((__noinline__))
void esc(struct Nums* nums) {
  glob = *nums;
}

__attribute__((__noinline__))
int main() {
  struct Nums nums = { .c=1 };       //// Dead store.
  printf("s1 nums.c: %d\n", nums.c); // DexLabel('s1')

  nums.c = 2;                        //// Killing store.
  printf("s2 nums.c: %d\n", nums.c); // DexLabel('s2')

  esc(&nums);                        //// Force nums to live on the stack.
  return 0;                          // DexLabel('s3')
}

// DexExpectWatchValue('nums.c', '1', on_line=ref('s1'))
// DexExpectWatchValue('nums.c', '2', from_line=ref('s2'), to_line=ref('s3'))