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namespace Q1.Compiler.visitors;
public partial class CCompilerVisitor
{
private void BaseBinaryOperation(CGrammarParser.ExpressionContext leftExpr, CGrammarParser.ExpressionContext rightExpr, string operation, string operationFriendlyName)
{
string left = this.VisitExpression(leftExpr);
this.Instruction($"push {left}", "left operand");
string right = this.VisitExpression(rightExpr);
this.Instruction($"mov {right}, V1", "right operand");
this.Instruction($"pop V0", "get left operand back");
this.Instruction($"{operation} V0, V1", $"compute {operationFriendlyName}");
}
private string BaseBinaryCompoundOperation(CGrammarParser.TargetContext leftTarget, CGrammarParser.ExpressionContext rightExpr, string operation, string operationFriendlyName, string operationOutput)
{
Target left = this.VisitTarget(leftTarget);
this.Instruction($"push {left.Value}", "left operand");
string? right = this.VisitExpression(rightExpr);
if (right == null)
throw new CompilerException($"Right operand for {operationFriendlyName} was not an expression.");
this.Instruction($"mov {right}, V1", "right operand");
this.Instruction($"pop V0", "get left operand back");
this.Instruction($"{operation} V0, V1", $"compute {operationFriendlyName}");
this.Instruction($"push {operationOutput}", "computation results");
left = this.VisitTarget(leftTarget);
this.Instruction("pop V1", "get computation results back");
this.DynamicMove(left.Type, "V1", left.Value, "store back into left param");
return left.Value;
}
public override string VisitNotExpression(CGrammarParser.NotExpressionContext context)
{
string value = this.VisitExpression(context.expression());
this.Instruction($"not {value}");
return "LX";
}
public override string VisitInvertExpression(CGrammarParser.InvertExpressionContext context)
{
string value = this.VisitExpression(context.expression());
this.Instruction($"inv {value}");
return "DX";
}
public override string VisitAddExpression(CGrammarParser.AddExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "add", "addition");
return "AX";
}
public override string VisitSubtractExpression(CGrammarParser.SubtractExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "sub", "subtraction");
return "AX";
}
public override string VisitMultiplyExpression(CGrammarParser.MultiplyExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "mul", "multiplication");
return "AX";
}
public override string VisitDivideExpression(CGrammarParser.DivideExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "div", "division");
return "AX";
}
public override string VisitModulusExpression(CGrammarParser.ModulusExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "mod", "modulus");
return "AX";
}
public override string VisitEqualExpression(CGrammarParser.EqualExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "cmp", "equality check");
return "LX";
}
public override string VisitNotEqualExpression(CGrammarParser.NotEqualExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "cmp", "inequality check");
this.Instruction($"not"); // lx is implicit
return "LX";
}
public override string VisitGreaterThanExpression(CGrammarParser.GreaterThanExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "gt", "greater than check");
return "LX";
}
public override string VisitLessThanExpression(CGrammarParser.LessThanExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "lt", "less than check");
return "LX";
}
public override string VisitLogicalOrExpression(CGrammarParser.LogicalOrExpressionContext context)
{
string left = this.VisitExpression(context.left);
string clauseBranch = this.GenerateBranchLabel("clause");
string endBranch = this.GenerateBranchLabel("end");
this.Instruction($"cmp {left}, 0", "logical or");
this.Instruction("bz"); // implicit LX
this.Instruction($"jmp {clauseBranch}"); // only if bz is not 0
this.Instruction("mov 1, V0", "first operand succeeded, store 1 and skip second operand");
this.Instruction($"jmp {endBranch}");
this.Branch(clauseBranch);
string right = this.VisitExpression(context.right);
this.Instruction($"cmp {right}, 0", "compare result from second operand to 0");
this.Instruction("not");
this.Instruction("mov LX, V0", "store second operand result");
this.Branch(endBranch);
return "V0";
}
public override string VisitLogicalAndExpression(CGrammarParser.LogicalAndExpressionContext context)
{
string left = this.VisitExpression(context.left);
string clauseBranch = this.GenerateBranchLabel("clause");
string endBranch = this.GenerateBranchLabel("end");
this.Instruction($"cmp {left}, 0", "logical and");
this.Instruction("not");
this.Instruction("bz"); // implicit LX
this.Instruction($"jmp {clauseBranch}"); // only if bz is not 0
this.Instruction("mov 0, V0", "first operand failed, store 0 and skip second");
this.Instruction($"jmp {endBranch}");
this.Branch(clauseBranch);
string right = this.VisitExpression(context.right);
this.Instruction($"cmp {right}, 0", "compare result from second operand to 0");
this.Instruction("not");
this.Instruction("mov LX, V0", "store second operand result");
this.Branch(endBranch);
return "V0";
}
public override string VisitGreaterThanOrEqualExpression(CGrammarParser.GreaterThanOrEqualExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "cmp", "equality check");
string endBranch = this.GenerateBranchLabel("end");
this.Instruction("bz");
this.Instruction($"jmp {endBranch}");
this.Instruction($"gt V0, V1");
this.Branch(endBranch);
return "LX";
}
public override string VisitLessThanOrEqualExpression(CGrammarParser.LessThanOrEqualExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "cmp", "equality check");
string endBranch = this.GenerateBranchLabel("end");
this.Instruction("bz");
this.Instruction($"jmp {endBranch}");
this.Instruction($"lt V0, V1");
this.Branch(endBranch);
return "LX";
}
public override string VisitBitwiseXorExpression(CGrammarParser.BitwiseXorExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "xor", "exclusive or");
return "DX";
}
public override string VisitBitwiseOrExpression(CGrammarParser.BitwiseOrExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "or", "or");
return "DX";
}
public override string VisitBitwiseAndExpression(CGrammarParser.BitwiseAndExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "and", "and");
return "DX";
}
public override string VisitBitwiseLeftShiftExpression(CGrammarParser.BitwiseLeftShiftExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "shl", "left shift");
return "DX";
}
public override string VisitBitwiseRightShiftExpression(CGrammarParser.BitwiseRightShiftExpressionContext context)
{
this.BaseBinaryOperation(context.left, context.right, "shr", "right shift");
return "DX";
}
public override string VisitCompoundAddExpression(CGrammarParser.CompoundAddExpressionContext context)
{
return this.BaseBinaryCompoundOperation(context.target(),
context.expression(),
"add",
"addition",
"AX");
}
public override string VisitCompoundSubtractExpression(CGrammarParser.CompoundSubtractExpressionContext context)
{
return this.BaseBinaryCompoundOperation(context.target(),
context.expression(),
"sub",
"subtraction",
"AX");
}
public override string VisitCompoundMultiplyExpression(CGrammarParser.CompoundMultiplyExpressionContext context)
{
return this.BaseBinaryCompoundOperation(context.target(),
context.expression(),
"mul",
"multiplication",
"AX");
}
public override string VisitCompoundDivideExpression(CGrammarParser.CompoundDivideExpressionContext context)
{
return this.BaseBinaryCompoundOperation(context.target(),
context.expression(),
"div",
"division",
"AX");
}
public override string VisitCompoundModulusExpression(CGrammarParser.CompoundModulusExpressionContext context)
{
return this.BaseBinaryCompoundOperation(context.target(),
context.expression(),
"mod",
"modulus",
"AX");
}
public override string VisitCompoundBitwiseOrExpression(CGrammarParser.CompoundBitwiseOrExpressionContext context)
{
return this.BaseBinaryCompoundOperation(context.target(),
context.expression(),
"or",
"or",
"DX");
}
public override string VisitCompoundBitwiseXorExpression(CGrammarParser.CompoundBitwiseXorExpressionContext context)
{
return this.BaseBinaryCompoundOperation(context.target(),
context.expression(),
"xor",
"exclusive or",
"DX");
}
public override string VisitCompoundBitwiseAndExpression(CGrammarParser.CompoundBitwiseAndExpressionContext context)
{
return this.BaseBinaryCompoundOperation(context.target(),
context.expression(),
"and",
"and",
"DX");
}
public override string VisitCompoundBitwiseLeftShiftExpression(CGrammarParser.CompoundBitwiseLeftShiftExpressionContext context)
{
return this.BaseBinaryCompoundOperation(context.target(),
context.expression(),
"shl",
"left shift",
"DX");
}
public override string VisitCompoundBitwiseRightShiftExpression(CGrammarParser.CompoundBitwiseRightShiftExpressionContext context)
{
return this.BaseBinaryCompoundOperation(context.target(),
context.expression(),
"shr",
"right shift",
"DX");
}
public override string VisitIncrementPrefixExpression(CGrammarParser.IncrementPrefixExpressionContext context)
{
Target target = this.VisitTarget(context.target());
this.Instruction($"inc {target.Value}", "++i");
return target.Value;
}
public override string VisitDecrementPrefixExpression(CGrammarParser.DecrementPrefixExpressionContext context)
{
Target target = this.VisitTarget(context.target());
this.Instruction($"dec {target.Value}", "--i");
return target.Value;
}
public override string VisitIncrementPostfixExpression(CGrammarParser.IncrementPostfixExpressionContext context)
{
Target target = this.VisitTarget(context.target());
this.Instruction($"push {target.Value}", "i++");
this.Instruction($"inc {target.Value}");
this.Instruction("pop V0");
return "V0";
}
public override string VisitDecrementPostfixExpression(CGrammarParser.DecrementPostfixExpressionContext context)
{
Target target = this.VisitTarget(context.target());
this.Instruction($"push {target.Value}", "i--");
this.Instruction($"dec {target.Value}");
this.Instruction($"pop V0");
return "V0";
}
}
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