parameters: (cfi_row, reg)
return_statement: return ' '.join(out)
docstring: Returns the postfix expression as string for a given register.
  
    Breakpad CFI row format specifies rules for unwinding each register in postfix
    expression form separated by space. Each rule starts with register name and a
    colon. Eg: "CFI R1: <rule> R2: <rule>".
docstring_summary: Returns the postfix expression as string for a given register.
docstring_tokens: Returns the postfix expression as string for a given register .
function: def _FindRuleForRegister(cfi_row, reg):
    """Returns the postfix expression as string for a given register.
  
    Breakpad CFI row format specifies rules for unwinding each register in postfix
    expression form separated by space. Each rule starts with register name and a
    colon. Eg: "CFI R1: <rule> R2: <rule>".
    """
    out = []
    found_register = False
    for part in cfi_row:
      if found_register:
        if part[-1] == ':':
          break
        out.append(part)
      elif part == reg + ':':
        found_register = True
    return ' '.join(out)
function_tokens: def _FindRuleForRegister ( cfi_row , reg ) : out = [ ] found_register = False for part in cfi_row : if found_register : if part [ - 1 ] == ':' : break out . append ( part ) elif part == reg + ':' : found_register = True return ' ' . join ( out )