tree 3a325320f3bdb7c56d401f754cb8e8b8a44d714b
parent a7209c3c89aeae9865f52402b41b9782ede9cd72
author George Rimar <grimar@accesssoftek.com> 1543235396 +0000
committer George Rimar <grimar@accesssoftek.com> 1543235396 +0000

[LLD][ELF] - Do not crash when parsing the -defsym option from a error state.

When we are in a error state, script parser will not parse the -defsym
expression and hence will not tokenize it. Then ScriptLexer::Pos will be 0
and LLD will assert and crash here:

MemoryBufferRef ScriptLexer::getCurrentMB() {
  assert(!MBs.empty() && Pos > 0); // Bang !

Solution - stop parsing the defsym in a error state. That is consistent
with the regular case (when we parse the linker script).

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@347549 91177308-0d34-0410-b5e6-96231b3b80d8