BlitzNext/compiler/gen/main.cpp

/*

  This generates a source code file for x86 instruction formats.

  Thanks NASM!

*/

#include <conio.h>
#include <fstream>
#include <iostream>
#include <string>

using namespace std;

static const char* optype(const string& s)
{
	if (s == "AL")
		return "AL";
	if (s == "AX")
		return "AX";
	if (s == "EAX")
		return "EAX";
	if (s == "CL")
		return "CL";
	if (s == "CX")
		return "CX";
	if (s == "ECX")
		return "ECX";
	if (s == "imm")
		return "IMM";
	if (s == "imm8")
		return "IMM8";
	if (s == "imm16")
		return "IMM16";
	if (s == "imm32")
		return "IMM32";
	if (s == "reg")
		return "REG";
	if (s == "reg8")
		return "REG8";
	if (s == "reg16")
		return "REG16";
	if (s == "reg32")
		return "REG32";
	if (s == "mem")
		return "MEM";
	if (s == "mem8")
		return "MEM8";
	if (s == "mem16")
		return "MEM16";
	if (s == "mem32")
		return "MEM32";
	if (s == "r/m")
		return "R_M";
	if (s == "r/m8")
		return "R_M8";
	if (s == "r/m16")
		return "R_M16";
	if (s == "r/m32")
		return "R_M32";
	if (s == "fpureg")
		return "FPUREG";
	if (s == "ST0")
		return "ST0";
	return 0;
}

void __cdecl main()
{
	string name, lhs, rhs, byte, bytes, flags, last;

	ifstream in("nasm_insts.txt");
	ofstream out("insts.cpp");

	out << "//\n//This is generated code - do not modify!!!!!\n//\n";
	out << "\n#include \"insts.hpp\"\n\n";
	out << "Inst insts[]={\n";

	for (; !in.eof(); in.ignore(INT_MAX, '\n')) {
		name.resize(0);

		in >> name;
		if (!name.size() || name[0] == '/')
			continue;

		lhs.resize(0);
		rhs.resize(0);
		const char *lop = "NONE", *rop = "NONE";

		while (isspace(in.peek()))
			in.get();
		getline(in, lhs, ';');

		if (int i = lhs.size()) {
			while (i && isspace(lhs[i - 1]))
				--i;
			if (i) {
				lhs.resize(i);
				i = lhs.find(',');
				if (i != string::npos) {
					rhs = lhs.substr(i + 1);
					lhs = lhs.substr(0, i);
				}
				lop = optype(lhs);
				if (!lop)
					continue;
				if (rhs.size() && !(rop = optype(rhs)))
					continue;
			}
		}

		bytes.resize(0);

		flags     = '0';
		bool fail = false;
		while (!fail) {
			in >> byte;
			if (byte[0] == '[')
				break;
			if (byte == "/r")
				flags += "|_R";
			else if (byte == "/0")
				flags += "|_0";
			else if (byte == "/1")
				flags += "|_1";
			else if (byte == "/2")
				flags += "|_2";
			else if (byte == "/3")
				flags += "|_3";
			else if (byte == "/4")
				flags += "|_4";
			else if (byte == "/5")
				flags += "|_5";
			else if (byte == "/6")
				flags += "|_6";
			else if (byte == "/7")
				flags += "|_7";
			else if (byte == "o16")
				flags += "|O16";
			else if (byte == "o32")
				flags += "|O32";
			else if (byte == "ow/od")
				flags += "|OW_OD";
			else if (byte == "ib")
				flags += "|IB";
			else if (byte == "iw")
				flags += "|IW";
			else if (byte == "id")
				flags += "|ID";
			else if (byte == "rw/rd")
				flags += "|RW_RD";
			else if (isxdigit(byte[0])) {
				string sub = byte.substr(2);
				if (sub.size()) {
					if (sub == "+r")
						flags += "|PLUSREG";
					else if (sub == "+cc")
						flags += "|PLUSCC";
					else
						fail = true;
				}
				bytes = bytes + "\\x" + byte[0] + byte[1];
			} else
				fail = true;
		}
		if (fail)
			continue;

		if (flags.find("0|") == 0)
			flags = flags.substr(2);
		for (size_t k = 0; k < name.size(); ++k)
			name[k] = tolower(name[k]);

		if (name == last)
			name = "0";
		else {
			last = name;
			name = '\"' + name + '\"';
		}

		char bf[4];
		_itoa(bytes.size() / 3, bf, 16);
		bytes = "\\x" + string(bf) + bytes;

		out << name << ',' << lop << ',' << rop << ',' << flags << ",\"" << bytes << "\",\n";
	}
	out << "\"\",0,0,0,0\n};\n";
	out.flush();
	out.close();
	cout << "All done!\n";
	_getch();
}