[lldb-dev] [Bug 26861] New: Can't proper evaluate std::list and union type in Linux

via lldb-dev lldb-dev at lists.llvm.org
Sun Mar 6 20:18:03 PST 2016


            Bug ID: 26861
           Summary: Can't proper evaluate std::list and union type in
           Product: lldb
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: aert_fudan at hotmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

For the following code:

union S
    std::int32_t n;     // occupies 4 bytes
    std::uint16_t s[2]; // occupies 4 bytes
    std::uint8_t c;     // occupies 1 byte
};                      // the whole union occupies 4 bytes

int main(int argc, char *argv[])
  string str("this is a test");
  list<int> l;
  unordered_map<int, string> ht;
  vector<int> v{1, 2, 3, 4};
  S s = {0x12345678};
  for (int i = 0; i < v.size(); ++ i) {
    printf("i: %d\n", i);
    ht[i] = str;
  return 0;  <==== Breakpoint stops here.

(lldb) p l
(std::list<int, std::allocator<int> >) $1 = size=4 {}

(lldb) p s
error: stl 0x00004d65: DW_TAG_member 's' refers to type 0x00004d78 which
extends beyond the bounds of 0x00004d52
(S) $0 = (n = 305419896, s = unsigned short [] @ 0x0000000000aa6550, c = 'x')

1. The content of list should be visualized. 
2. s.s field should be visualized without emiting error.

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