diff options
Diffstat (limited to 'Compiler/visitors/Targets.cs')
| -rw-r--r-- | Compiler/visitors/Targets.cs | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/Compiler/visitors/Targets.cs b/Compiler/visitors/Targets.cs new file mode 100644 index 0000000..10d97f4 --- /dev/null +++ b/Compiler/visitors/Targets.cs @@ -0,0 +1,40 @@ +namespace Q1.Compiler.visitors; + +public partial class CCompilerVisitor +{ + private Target VisitTarget(CGrammarParser.TargetContext target) + { + Target? expressionString = this.Visit(target) as Target; + if (expressionString == null) + throw new CompilerException("Target did not return a target"); + + return expressionString; + } + + public override Target VisitVariableTarget(CGrammarParser.VariableTargetContext context) + { + string varName = context.ID().GetText(); + VariableReference reference = this.FindVariable(varName); + + return new Target(reference.Type, $"[${reference.Address:X4}]", $"${reference.Address:X4}"); + } + + public override object? VisitIndexerTarget(CGrammarParser.IndexerTargetContext context) + { + Target obj = this.VisitTarget(context.obj); + if (obj.Type is not CTypePtr ptr) + throw new CompilerException("Indexer target was not a pointer!"); + + this.Instruction($"push {obj.Value}", "store index obj"); + + string indexer = this.VisitExpression(context.indexer); + + this.Instruction($"mov {indexer}, V1", "store indexer"); + this.Instruction($"pop V0", "restore index obj"); + this.Instruction($"mul V1, {ptr.Sub.Size}", $"multiply indexer by {ptr.Sub.Size}"); + this.Instruction($"add AX, V0", "add indexer and index obj"); + this.Instruction($"mov AX, V0", "move to general purpose register"); + + return new Target(ptr.Sub, $"[V0]", $"V0"); + } +}
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