OXYGENHUB
◆ main openmsx / src / unittest / Dasm_test.cc
1.2 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
1 
#include "catch.hpp"
2
3 
#include "Dasm.hh"
4
5 
#include <iostream>
6 
#include <set>
7
8 
using namespace openmsx;
9
10 
TEST_CASE("instructionLength, dasm")
11 
{
12 
	std::set<std::string, std::less<>> allInstructions;
13 
	std::array<uint8_t, 4> opcode = {0, 0, 0, 0};
14 
	std::string dasmString;
15
16 
	unsigned count = 0;
17 
	bool end = false;
18 
	while (!end) {
19 
		++count;
20
21 
		auto instrLen = instructionLength(opcode);
22 
		REQUIRE(instrLen);
23 
		REQUIRE(1 <= *instrLen);
24 
		REQUIRE(*instrLen <= 4);
25
26 
		dasmString.clear();
27 
		auto dasmLen = dasm(std::span(opcode.data(), *instrLen), 0x1234, dasmString);
28 
		CHECK(dasmLen == *instrLen);
29
30 
		// check for duplicate instructions
31 
		auto [it, inserted] = allInstructions.insert(dasmString);
32 
		CHECK(inserted);
33
34 
		if (dasmLen != *instrLen || !inserted) {
35 
			std::string info;
36 
			for (auto i : xrange(*instrLen)) {
37 
				strAppend(info, ' ', hex_string<2>(opcode[i]));
38 
			}
39 
			std::cout << "opcode:" << info << " (" << dasmString << ")\n";
40 
		}
41
42 
		// goto next instruction
43 
		unsigned idx = *instrLen - 1;
44 
		while (true) {
45 
			if (opcode[idx] == 255) {
46 
				opcode[idx] = 0;
47 
				if (idx == 0) {
48 
					end = true;
49 
					break;
50 
				}
51 
				--idx;
52 
			} else {
53 
				++opcode[idx];
54 
				break;
55 
			}
56 
		}
57 
	}
58 
	REQUIRE(count == 2'904'196); // found experimentally
59 
}