[llvm-bugs] [Bug 37555] New: [WebAssembly] Segment->OutputSeg is nullptr at DefinedData::getVirtualAddress

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37555

            Bug ID: 37555
           Summary: [WebAssembly] Segment->OutputSeg is nullptr at
                    DefinedData::getVirtualAddress
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: WebAssembly
          Assignee: unassignedbugs at nondot.org
          Reporter: ydelendik at mozilla.com
                CC: llvm-bugs at lists.llvm.org, sbc at chromium.org

The lld's getVirtualAddress() fails for function static locals when debug
information is enabled in object file.

The test case compiled from C:

struct S {
  int i; int j;
};


void test(struct S *i) {
  i->i ^= i->j;
}

void start() {
  static struct S s = { 1, 2 };
  test(&s);
}

void _start() { }

// `clang-7.0 --target=wasm32-unknown-unknown-wasm test.c -g -c -o test.o`

The command `lld -flavor wasm test.o -o test.wasm` fails at
https://github.com/llvm-mirror/lld/blob/f8a91f09fc90265ce7f104ed4c0e4aebcfedc693/wasm/Symbols.cpp#L155
due to Segment->OutputSeg being NULL.

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