mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-19 12:30:32 +00:00
648 lines
22 KiB
C#
648 lines
22 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Text;
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namespace Cosmos.Compiler.XSharp {
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public class TokenPatterns {
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protected class Pattern {
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public readonly TokenList Tokens;
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public readonly int Hash;
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public readonly CodeFunc Code;
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public Pattern(TokenList aTokens, CodeFunc aCode) {
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Tokens = aTokens;
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Hash = aTokens.GetHashCode();
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Code = aCode;
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}
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}
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protected string mFuncName = null;
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protected bool mFuncExitFound = false;
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public bool EmitUserComments = true;
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public delegate void CodeFunc(TokenList aTokens, Nasm.Assembler aAsm);
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protected List<Pattern> mPatterns = new List<Pattern>();
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protected string mGroup;
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protected bool mInIntHandler;
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protected string[] mCompareOps;
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protected List<string> mCompares = new List<string>();
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protected TokenList mBlockStarter = null;
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protected List<string> mBlock = null;
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protected int mBlockLabel = 0;
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public TokenPatterns() {
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mCompareOps = "< > = != <= >= 0".Split(" ".ToCharArray());
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foreach (var xComparison in mCompareOps) {
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if (xComparison != "0") {
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mCompares.Add("_REG " + xComparison + " 123");
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mCompares.Add("_REG " + xComparison + " _REG");
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mCompares.Add("_REG " + xComparison + " _ABC");
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mCompares.Add("_REG " + xComparison + " #_ABC");
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mCompares.Add("_ABC " + xComparison + " #_ABC");
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}
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}
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AddPatterns();
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}
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protected string Quoted(string aString) {
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return "\"" + aString + "\"";
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}
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protected int IntValue(Token aToken) {
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if (aToken.Value.StartsWith("0x")) {
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return int.Parse(aToken.Value.Substring(2), NumberStyles.AllowHexSpecifier);
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} else {
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return int.Parse(aToken.Value);
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}
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}
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protected string ConstLabel(Token aToken) {
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return GroupLabel("Const_" + aToken);
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}
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protected string GroupLabel(string aLabel) {
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return mGroup + "_" + aLabel;
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}
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protected string FuncLabel(string aLabel) {
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return mGroup + "_" + mFuncName + "_" + aLabel;
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}
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protected string BlockLabel(string aLabel) {
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return FuncLabel("Block" + mBlockLabel + aLabel);
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}
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protected string GetLabel(Token aToken) {
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if (aToken.Type != TokenType.AlphaNum && !aToken.Matches("Exit")) {
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throw new Exception("Label must be AlphaNum.");
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}
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string xValue = aToken.Value;
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if (mFuncName == null) {
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if (xValue.StartsWith(".")) {
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return xValue.Substring(1);
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}
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return GroupLabel(xValue);
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} else {
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if (xValue.StartsWith("..")) {
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return xValue.Substring(2);
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} else if (xValue.StartsWith(".")) {
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return GroupLabel(xValue.Substring(1));
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}
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return FuncLabel(xValue);
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}
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}
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protected void StartFunc(string aName) {
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mFuncName = aName;
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mFuncExitFound = false;
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}
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protected void StartBlock(TokenList aTokens, bool aIsCollector) {
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mBlockStarter = aTokens;
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if (aIsCollector) {
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mBlock = new List<string>();
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}
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mBlockLabel++;
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}
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protected void EndFunc(Nasm.Assembler aAsm) {
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if (!mFuncExitFound) {
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aAsm += mGroup + "_" + mFuncName + "_Exit:";
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}
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if (mInIntHandler) {
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aAsm += "IRet";
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} else {
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aAsm += "Ret";
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}
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mFuncName = null;
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}
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protected string GetDestRegister(TokenList aTokens, int aIdx) {
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return GetRegister("Destination", aTokens, aIdx);
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}
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protected string GetSrcRegister(TokenList aTokens, int aIdx) {
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return GetRegister("Source", aTokens, aIdx);
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}
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protected string GetRegister(string aPrefix, TokenList aTokens, int aIdx) {
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var xToken = aTokens[aIdx].Type;
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Token xNext = null;
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if (aIdx + 1 < aTokens.Count) {
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xNext = aTokens[aIdx + 1];
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}
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string xResult = aPrefix + "Reg = RegistersEnum." + aTokens[aIdx].Value;
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if (xNext != null) {
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if (xNext.Value == "[") {
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string xDisplacement;
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if (aTokens[aIdx + 2].Value == "-") {
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xDisplacement = "-" + aTokens[aIdx + 2].Value;
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} else {
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xDisplacement = aTokens[aIdx + 2].Value;
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}
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xResult = xResult + ", " + aPrefix + "IsIndirect = true, " + aPrefix + "Displacement = " + xDisplacement;
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}
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}
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return xResult;
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}
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protected string GetCompare(TokenList aTokens, int aStart) {
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string xLeft = aTokens[1].Value;
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if (aTokens[1].Type == TokenType.AlphaNum) {
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// Hardcoded to dword for now
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xLeft = "dword [" + GetLabel(aTokens[1]) + "]";
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}
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string xRight = aTokens[3].Value;
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if (aTokens[3].Type == TokenType.AlphaNum) {
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xRight = "[" + GetLabel(aTokens[3]) + "]";
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} else if (aTokens[3].Value == "#") {
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xRight = ConstLabel(aTokens[4]);
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}
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return "Cmp " + xLeft + ", " + xRight;
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}
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protected string GetJump(Token aToken) {
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return GetJump(aToken, false);
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}
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protected string GetJump(Token aToken, bool aInvert) {
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string xOp = aToken.Value;
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if (aInvert) {
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if (xOp == "<") {
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xOp = ">=";
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} else if (xOp == ">") {
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xOp = "<=";
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} else if (xOp == "=") {
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xOp = "!=";
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} else if (xOp == "0") {
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// Same as JE, but implies intent in .asm better
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xOp = "!0";
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} else if (xOp == "!=") {
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xOp = "=";
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} else if (xOp == "<=") {
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xOp = ">";
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} else if (xOp == ">=") {
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xOp = "<";
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} else {
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throw new Exception("Unrecognized symbol in conditional: " + xOp);
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}
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}
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if (xOp == "<") {
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return "JB"; // unsigned
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} else if (xOp == ">") {
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return "JA"; // unsigned
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} else if (xOp == "=") {
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return "JE";
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} else if (xOp == "0") {
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// Same as JE, but implies intent in .asm better
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return "JZ";
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} else if (xOp == "!=") {
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return "JNE";
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} else if (xOp == "!0") {
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// Same as JNE, but implies intent in .asm better
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return "JNZ";
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} else if (xOp == "<=") {
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return "JBE"; // unsigned
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} else if (xOp == ">=") {
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return "JAE"; // unsigned
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} else {
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throw new Exception("Unrecognized symbol in conditional: " + xOp);
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}
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}
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protected void AddPatterns() {
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AddPattern("! Move EAX, 0", "{0}");
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AddPattern("// Comment", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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if (EmitUserComments) {
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string xValue = aTokens[0].Value;
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xValue = xValue.Replace("\"", "\\\"");
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aAsm += "; " + xValue;
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}
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});
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// Labels
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// Local and proc level are used most, so designed to make their syntax shortest.
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// Think of the dots like a directory, . is current group, .. is above that.
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// ..Name: - Global level. Emitted exactly as is.
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// .Name: - Group level. Group_Name
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// Name: - Function level. Group_ProcName_Name
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AddPattern("Exit:", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += GetLabel(aTokens[0]) + ":";
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mFuncExitFound = true;
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});
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AddPattern("_ABC:", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += GetLabel(aTokens[0]) + ":";
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});
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AddPattern("Call _ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Call " + GetLabel(aTokens[1]);
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});
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AddPattern("Goto _ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Jmp " + GetLabel(aTokens[1]);
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});
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AddPattern("const _ABC = 123", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += ConstLabel(aTokens[1]) + " equ " + aTokens[3];
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});
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AddPattern("var _ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm.Data.Add(GetLabel(aTokens[1]) + " dd 0");
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});
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AddPattern("var _ABC = 123", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm.Data.Add(GetLabel(aTokens[1]) + " dd " + aTokens[3].Value);
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});
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AddPattern("var _ABC = 'Text'", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm.Data.Add(GetLabel(aTokens[1]) + " db \"" + aTokens[3].Value + "\"");
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});
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AddPattern(new string[] {
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"var _ABC byte[123]",
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"var _ABC word[123]",
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"var _ABC dword[123]"
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}, delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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string xSize;
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if (aTokens[2].Matches("byte")) {
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xSize = "db";
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} else if (aTokens[2].Matches("word")) {
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xSize = "dw";
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} else if (aTokens[2].Matches("dword")) {
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xSize = "dd";
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} else {
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throw new Exception("Unknown size specified");
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}
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aAsm.Data.Add(GetLabel(aTokens[1]) + " TIMES " + aTokens[4].Value + " " + xSize + " 0");
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});
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foreach (var xCompare in mCompares) {
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// 0 1 2 3 4
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AddPattern("while " + xCompare + " {", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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StartBlock(aTokens, false);
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aAsm += BlockLabel("Begin") + ":";
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aAsm += GetCompare(aTokens, 1);
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aAsm += GetJump(aTokens[2], true) + " " + BlockLabel("End");
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});
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}
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// Must test separate since !0 is two tokens
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AddPattern("if !0 goto _ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "JNZ " + GetLabel(aTokens[4]);
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});
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AddPattern("if !0 return", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "JNZ " + FuncLabel("Exit");
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});
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foreach (var xTail in "goto _ABC|return".Split("|".ToCharArray())) {
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foreach (var xComparison in mCompareOps) {
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AddPattern("if " + xComparison + " " + xTail, delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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string xLabel;
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if (string.Equals(aTokens[2].Value, "exit", StringComparison.InvariantCultureIgnoreCase)) {
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xLabel = FuncLabel("Exit");
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} else {
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xLabel = GetLabel(aTokens[3]);
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}
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aAsm += GetJump(aTokens[1]) + " " + xLabel;
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});
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}
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foreach (var xCompare in mCompares) {
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// 0 1 2 3 4
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AddPattern("if " + xCompare + " " + xTail, delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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int xTailIdx = aTokens[3].Value == "#" ? 5 : 4;
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aAsm += GetCompare(aTokens, 1);
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string xLabel;
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if (aTokens[xTailIdx].Matches("return")) {
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xLabel = FuncLabel("Exit");
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} else {
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xLabel = GetLabel(aTokens[xTailIdx + 1]);
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}
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aAsm += GetJump(aTokens[2]) + " " + xLabel;
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});
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}
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}
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AddPattern("_REG ?= 123", "Cmp {0}, {2}");
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AddPattern("_REG ?= _ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Cmp {0}, " + GetLabel(aTokens[2]);
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});
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AddPattern("_REG ?= #_ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Cmp {0}, " + ConstLabel(aTokens[3]);
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});
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AddPattern("_REG ?& 123", "Test {0}, {2}");
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AddPattern("_REG ?& _ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Test {0}, " + GetLabel(aTokens[2]);
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});
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AddPattern("_REG ?& #_ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Test {0}, " + ConstLabel(aTokens[3]);
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});
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AddPattern("_REG ~> 123", "ROR {0}, {2}");
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AddPattern("_REG <~ 123", "ROL {0}, {2}");
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AddPattern("_REG >> 123", "SHR {0}, {2}");
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AddPattern("_REG << 123", "SHL {0}, {2}");
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AddPattern("_REG = 123", "Mov {0}, {2}");
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AddPattern(new string[] {
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"_REG32[1] = 123",
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"_REGIDX[1] = 123"
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},
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"Mov dword [{0} + {2}], {5}"
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);
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AddPattern(new string[] {
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"_REG32[-1] = 123",
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"_REGIDX[-1] = 123"
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},
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"Mov dword [{0} - {2}], {5}"
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);
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AddPattern("_REG = #_ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Mov {0}, " + ConstLabel(aTokens[3]);
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});
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AddPattern(new string[] {
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"_REG32[1] = 123",
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"_REGIDX[1] = 123"
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}, delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Mov dword [{0} + {2}], " + ConstLabel(aTokens[5]);
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});
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AddPattern(new string[] {
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"_REG32[-1] = 123",
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"_REGIDX[-1] = 123"
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}, delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Mov dword [{0} - {2}], " + ConstLabel(aTokens[5]);
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});
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AddPattern("_REG = _REG", "Mov {0}, {2}");
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AddPattern(new string[] {
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"_REG32[1] = _REG",
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"_REGIDX[1] = _REG"},
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//
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"Mov [{0} + {2}], {5}"
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);
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AddPattern(new string[] {
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"_REG32[-1] = _REG",
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"_REGIDX[-1] = _REG"},
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//
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"Mov [{0} - {3}], {6}"
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);
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AddPattern(new string[] {
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"_REG = _REG32[1]",
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"_REG = _REGIDX[1]"},
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//
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"Mov {0}, [{2} + {4}]"
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);
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AddPattern(new string[] {
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"_REG = _REG32[-1]",
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"_REG = _REGIDX[-1]"},
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//
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"Mov {0}, [{2} - {5}]"
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);
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AddPattern("_REG = _ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Mov {0}, [" + GetLabel(aTokens[2]) + "]";
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});
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// why not [var] like registers? Because its less frequent to access th ptr
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// and it is like a reg.. without [] to get the value...
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AddPattern("_REG = @_ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Mov {0}, " + GetLabel(aTokens[3]);
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});
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AddPattern(new string[] {
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"Port[DX] = AL",
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"Port[DX] = AX",
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"Port[DX] = EAX"
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},
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"Out DX, {5}"
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);
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AddPattern(new string[] {
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"AL = Port[DX]",
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"AX = Port[DX]",
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"EAX = Port[DX]"},
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//
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"In {0}, DX"
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);
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AddPattern("+123", "Push dword {1}");
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AddPattern(new string[] {
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"+123 as byte",
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"+123 as word",
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"+123 as dword"
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}, "Push {3} {1}");
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AddPattern("+_REG", "Push {1}");
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AddPattern(new string[] {
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//0 1 2 3
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"+#_ABC",
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"+#_ABC as byte",
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"+#_ABC as word",
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"+#_ABC as dword"
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}, delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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string xSize = "dword ";
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if (aTokens.Count > 2) {
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xSize = aTokens[3].Value + " ";
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}
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aAsm += "Push " + xSize + ConstLabel(aTokens[1]);
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});
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AddPattern("+All", "Pushad");
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AddPattern("-All", "Popad");
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AddPattern("-_REG", "Pop {1}");
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AddPattern("_ABC = _REG",
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delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Mov [" + GetLabel(aTokens[0]) + "], {2}";
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});
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AddPattern("_ABC = 123", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Mov dword [" + GetLabel(aTokens[0]) + "], {2}";
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});
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AddPattern(new string[] {
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"_ABC = 123 as byte",
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"_ABC = 123 as word",
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"_ABC = 123 as dword"},
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delegate(TokenList aTokens, Nasm.Assembler aAsm) {
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aAsm += "Mov {4} [" + GetLabel(aTokens[0]) + "], {2}";
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});
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// TODO: Allow asm to optimize these to Inc/Dec
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AddPattern(new string[] {
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"_REG + 1",
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"_REG + _REG"
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}, "Add {0}, {2}");
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AddPattern(new string[] {
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"_REG - 1",
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"_REG - _REG"
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}, "Sub {0}, {2}");
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AddPattern("_REG++", "Inc {0}");
|
|
AddPattern("_REG--", "Dec {0}");
|
|
|
|
AddPattern("}", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
|
|
// Use mBlockStarter, not mBlock because not all blocks use mBlock to collect
|
|
// (repeat does for example, but while does not)
|
|
if (mBlockStarter == null) {
|
|
EndFunc(aAsm);
|
|
} else {
|
|
if (mBlockStarter[0].Matches("repeat")) {
|
|
int xCount = int.Parse(mBlockStarter[1].Value);
|
|
for (int i = 1; i <= xCount; i++) {
|
|
aAsm.Code.AddRange(mBlock);
|
|
}
|
|
|
|
} else if (mBlockStarter[0].Matches("while")) {
|
|
aAsm += "jmp " + BlockLabel("Begin");
|
|
aAsm += BlockLabel("End") + ":";
|
|
|
|
} else {
|
|
throw new Exception("Unknown block starter.");
|
|
}
|
|
|
|
mBlockStarter = null;
|
|
mBlock = null;
|
|
}
|
|
});
|
|
|
|
AddPattern("Group _ABC", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
|
|
mGroup = aTokens[1].Value;
|
|
});
|
|
|
|
AddPattern("Exit", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
|
|
aAsm += "Jmp " + FuncLabel("Exit");
|
|
});
|
|
|
|
AddPattern("Repeat 4 times {", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
|
|
StartBlock(aTokens, true);
|
|
});
|
|
|
|
AddPattern("Interrupt _ABC {", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
|
|
StartFunc(aTokens[1].Value);
|
|
mInIntHandler = true;
|
|
aAsm += mGroup + "_{1}:";
|
|
});
|
|
|
|
AddPattern("Return", "Ret");
|
|
AddPattern("ReturnInterrupt", "IRet");
|
|
|
|
AddPattern("Function _ABC {", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
|
|
StartFunc(aTokens[1].Value);
|
|
mInIntHandler = false;
|
|
aAsm += mGroup + "_{1}:";
|
|
});
|
|
|
|
AddPattern("Checkpoint 'Text'", delegate(TokenList aTokens, Nasm.Assembler aAsm) {
|
|
// This method emits a lot of ASM, but thats what we want becuase
|
|
// at this point we need ASM as simple as possible and completely transparent.
|
|
// No stack changes, no register mods, no calls, no jumps, etc.
|
|
|
|
// TODO: Add an option on the debug project properties to turn this off.
|
|
// Also see WriteDebugVideo in CosmosAssembler.cs
|
|
var xPreBootLogging = true;
|
|
if (xPreBootLogging) {
|
|
UInt32 xVideo = 0xB8000;
|
|
for (UInt32 i = xVideo; i < xVideo + 80 * 2; i = i + 2) {
|
|
aAsm += "mov byte [0x" + i.ToString("X") + "], 0";
|
|
aAsm += "mov byte [0x" + (i + 1).ToString("X") + "], 0x02";
|
|
}
|
|
|
|
foreach (var xChar in aTokens[1].Value) {
|
|
aAsm += "mov byte [0x" + xVideo.ToString("X") + "], " + (byte)xChar;
|
|
xVideo = xVideo + 2;
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
protected Pattern FindMatch(TokenList aTokens) {
|
|
int xHash = aTokens.GetPatternHashCode();
|
|
// Get a list of matching hashes, but then we have to
|
|
// search for exact pattern match because it is possible
|
|
// to have duplicate hashes. Hashes just provide us a quick way
|
|
// to reduce the search.
|
|
foreach (var xPattern in mPatterns.Where(q => q.Hash == xHash)) {
|
|
if (xPattern.Tokens.PatternMatches(aTokens)) {
|
|
return xPattern;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public Nasm.Assembler GetPatternCode(TokenList aTokens) {
|
|
var xPattern = FindMatch(aTokens);
|
|
if (xPattern == null) {
|
|
return null;
|
|
}
|
|
|
|
var xResult = new Nasm.Assembler();
|
|
xPattern.Code(aTokens, xResult);
|
|
|
|
// Apply {0} etc into string
|
|
// This happens twice for block code, but its ok because the first pass
|
|
// strips out all tags.
|
|
for (int i = 0; i < xResult.Code.Count; i++) {
|
|
xResult.Code[i] = string.Format(xResult.Code[i], aTokens.ToArray());
|
|
}
|
|
|
|
return xResult;
|
|
}
|
|
|
|
public Nasm.Assembler GetNonPatternCode(TokenList aTokens) {
|
|
if (aTokens.Count == 0) {
|
|
return null;
|
|
}
|
|
|
|
var xFirst = aTokens[0];
|
|
var xLast = aTokens[aTokens.Count - 1];
|
|
var xResult = new Nasm.Assembler();
|
|
|
|
// Find match and emit X#
|
|
if (aTokens.Count == 2
|
|
&& xFirst.Type == TokenType.AlphaNum
|
|
&& xLast.Matches("()")
|
|
) {
|
|
// () could be handled by pattern, but best to keep in one place for future
|
|
xResult += "Call " + GroupLabel(aTokens[0].Value);
|
|
|
|
} else {
|
|
// No matches
|
|
return null;
|
|
}
|
|
|
|
return xResult;
|
|
}
|
|
|
|
public Nasm.Assembler GetCode(string aLine) {
|
|
var xParser = new Parser(aLine, false, false);
|
|
var xTokens = xParser.Tokens;
|
|
var xResult = GetPatternCode(xTokens);
|
|
if (xResult == null) {
|
|
xResult = GetNonPatternCode(xTokens);
|
|
}
|
|
|
|
if (mBlock != null) {
|
|
mBlock.AddRange(xResult.Code);
|
|
xResult.Code.Clear();
|
|
}
|
|
return xResult;
|
|
}
|
|
|
|
protected void AddPattern(string aPattern, CodeFunc aCode) {
|
|
var xParser = new Parser(aPattern, false, true);
|
|
var xPattern = new Pattern(xParser.Tokens, aCode);
|
|
mPatterns.Add(xPattern);
|
|
}
|
|
protected void AddPattern(string[] aPatterns, CodeFunc aCode) {
|
|
foreach (var xPattern in aPatterns) {
|
|
AddPattern(xPattern, aCode);
|
|
}
|
|
}
|
|
protected void AddPattern(string aPattern, string aCode) {
|
|
AddPattern(aPattern, delegate(TokenList aTokens, Nasm.Assembler aAsm) {
|
|
aAsm += aCode;
|
|
});
|
|
}
|
|
protected void AddPattern(string[] aPatterns, string aCode) {
|
|
foreach (var xPattern in aPatterns) {
|
|
AddPattern(xPattern, aCode);
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|