fix: compare strings by content

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/CodeGen/CodeGen.cc b/lib/CodeGen/CodeGen.cc
index 903d8ef..a6669a6 100644
--- a/lib/CodeGen/CodeGen.cc
+++ b/lib/CodeGen/CodeGen.cc
@@ -637,6 +637,21 @@ Value *CodeGen::emitExpr(ExprAST *Expr) {
             if (!L || !R) return nullptr;
             return StrHandler->emitConcat(L, R);
         }
+        // STRING and explicit pointers share LLVM's ptr representation;
+        // string comparisons must dispatch on the pseudocode type.
+        switch (Bin->getOp()) {
+        case tok_eq: case tok_ne: case '<': case '>': case tok_le: case tok_ge:
+            if ((LT && LT->isString()) || (RT && RT->isString())) {
+                if (!(LT && LT->isString() && RT && RT->isString())) {
+                    reportError("STRING comparison requires two STRING operands (line %d)", Bin->getLine());
+                    return nullptr;
+                }
+                return StrHandler->emitCompare(Bin->getOp(), L, R);
+            }
+            break;
+        default:
+            break;
+        }
         return ArithHandler->emitBinaryOp(Bin->getOp(), L, R, Bin->getLine());
     }