https://github.com/akkartik/mu/blob/master/034check_operand_bounds.cc
  1 //:: Check that the different arguments of an instruction aren't too large for their bitfields.
  2 
  3 void test_check_bitfield_sizes() {
  4   Hide_errors = true;
  5   run(
  6       "== code 0x1\n"
  7       "01/add 4/mod 3/rm32 1/r32\n"  // add ECX to EBX
  8   );
  9   CHECK_TRACE_CONTENTS(
 10       "error: '4/mod' too large to fit in bitfield mod\n"
 11   );
 12 }
 13 
 14 :(before "End Globals")
 15 map<string, uint32_t> Operand_bound;
 16 :(before "End One-time Setup")
 17 put_new(Operand_bound, "subop", 1<<3);
 18 put_new(Operand_bound, "mod", 1<<2);
 19 put_new(Operand_bound, "rm32", 1<<3);
 20 put_new(Operand_bound, "base", 1<<3);
 21 put_new(Operand_bound, "index", 1<<3);
 22 put_new(Operand_bound, "scale", 1<<2);
 23 put_new(Operand_bound, "r32", 1<<3);
 24 put_new(Operand_bound, "disp8", 1<<8);
 25 put_new(Operand_bound, "disp16", 1<<16);
 26 // no bound needed for disp32
 27 put_new(Operand_bound, "imm8", 1<<8);
 28 // no bound needed for imm32
 29 
 30 :(before "Pack Operands(segment code)")
 31 check_argument_bounds(code);
 32 if (trace_contains_errors()) return;
 33 :(code)
 34 void check_argument_bounds(const segment& code) {
 35   trace(3, "transform") << "-- check argument bounds" << end();
 36   for (int i = 0;  i < SIZE(code.lines);  ++i) {
 37     const line& inst = code.linespre { line-height: 125%; }
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