Very basic matrix support in backend

src/check_expr.cpp

@@ -1400,8 +1400,9 @@ bool check_unary_op(CheckerContext *c, Operand *o, Token op) {
 }
 
 bool check_binary_op(CheckerContext *c, Operand *o, Token op) {
+	Type *main_type = o->type;
 	// TODO(bill): Handle errors correctly
-	Type *type = base_type(core_array_type(o->type));
+	Type *type = base_type(core_array_type(main_type));
 	Type *ct = core_type(type);
 	switch (op.kind) {
 	case Token_Sub:
@@ -1414,10 +1415,15 @@ bool check_binary_op(CheckerContext *c, Operand *o, Token op) {
 		}
 		break;
 
-	case Token_Mul:
 	case Token_Quo:
-	case Token_MulEq:
 	case Token_QuoEq:
+		if (is_type_matrix(main_type)) {
+			error(op, "Operator '%.*s' is only allowed with matrix types", LIT(op.string));
+			return false;
+		}
+		/*fallthrough*/
+	case Token_Mul:
+	case Token_MulEq:
 	case Token_AddEq:
 		if (is_type_bit_set(type)) {
 			return true;
@@ -1458,6 +1464,10 @@ bool check_binary_op(CheckerContext *c, Operand *o, Token op) {
 	case Token_ModMod:
 	case Token_ModEq:
 	case Token_ModModEq:
+		if (is_type_matrix(main_type)) {
+			error(op, "Operator '%.*s' is only allowed with matrix types", LIT(op.string));
+			return false;
+		}
 		if (!is_type_integer(type)) {
 			error(op, "Operator '%.*s' is only allowed with integers", LIT(op.string));
 			return false;
@@ -2671,6 +2681,114 @@ bool can_use_other_type_as_type_hint(bool use_lhs_as_type_hint, Type *other_type
 }
 
 
+void check_binary_matrix(CheckerContext *c, Token const &op, Operand *x, Operand *y, Type *type_hint, bool use_lhs_as_type_hint) {
+	if (!check_binary_op(c, x, op)) {
+		x->mode = Addressing_Invalid;
+		return;
+	}
+	
+	if (is_type_matrix(x->type)) {
+		Type *xt = base_type(x->type);
+		Type *yt = base_type(y->type);
+		GB_ASSERT(xt->kind == Type_Matrix);
+		if (op.kind == Token_Mul) {
+			if (yt->kind == Type_Matrix) {
+				if (!are_types_identical(xt->Matrix.elem, yt->Matrix.elem)) {
+					goto matrix_error;
+				}
+				
+				if (xt->Matrix.column_count != yt->Matrix.row_count) {
+					goto matrix_error;
+				}
+				x->mode = Addressing_Value;
+				x->type = alloc_type_matrix(xt->Matrix.elem, xt->Matrix.row_count, yt->Matrix.column_count);
+				goto matrix_success;
+			} else if (yt->kind == Type_Array) {
+				if (!are_types_identical(xt->Matrix.elem, yt->Array.elem)) {
+					goto matrix_error;
+				}
+				
+				if (xt->Matrix.column_count != yt->Array.count) {
+					goto matrix_error;
+				}
+				
+				// Treat arrays as column vectors
+				x->mode = Addressing_Value;
+				x->type = alloc_type_matrix(xt->Matrix.elem, xt->Matrix.row_count, 1);
+				goto matrix_success;
+			}
+		}
+		if (!are_types_identical(xt, yt)) {
+			goto matrix_error;
+		}
+		x->mode = Addressing_Value;
+		x->type = xt;
+		goto matrix_success;
+	} else {
+		Type *xt = base_type(x->type);
+		Type *yt = base_type(y->type);
+		GB_ASSERT(is_type_matrix(yt));
+		GB_ASSERT(!is_type_matrix(xt));
+		
+		if (op.kind == Token_Mul) {
+			// NOTE(bill): no need to handle the matrix case here since it should be handled above
+			if (xt->kind == Type_Array) {
+				if (!are_types_identical(yt->Matrix.elem, xt->Array.elem)) {
+					goto matrix_error;
+				}
+				
+				if (xt->Array.count != yt->Matrix.row_count) {
+					goto matrix_error;
+				}
+				
+				// Treat arrays as row vectors
+				x->mode = Addressing_Value;
+				x->type = alloc_type_matrix(xt->Matrix.elem, 1, xt->Matrix.column_count);
+				goto matrix_success;
+			}
+		}
+		if (!are_types_identical(xt, yt)) {
+			goto matrix_error;
+		}
+		x->mode = Addressing_Value;
+		x->type = xt;
+		goto matrix_success;
+	}
+
+matrix_success:
+	if (type_hint != nullptr) {
+		Type *th = base_type(type_hint);
+		if (are_types_identical(th, x->type)) {
+			x->type = type_hint;
+		} else if (x->type->kind == Type_Matrix && th->kind == Type_Array) {
+			Type *xt = x->type;
+			if (!are_types_identical(xt->Matrix.elem, th->Array.elem)) {
+				// ignore
+			} else if (xt->Matrix.row_count == 1 && xt->Matrix.column_count == th->Array.count) {
+				x->type = type_hint;
+			} else if (xt->Matrix.column_count == 1 && xt->Matrix.row_count == th->Array.count) {
+				x->type = type_hint;
+			}
+		}
+	}
+	return;
+	
+	
+matrix_error:
+	gbString xt = type_to_string(x->type);
+	gbString yt = type_to_string(y->type);
+	gbString expr_str = expr_to_string(x->expr);
+	error(op, "Mismatched types in binary matrix expression '%s' for operator '%.*s' : '%s' vs '%s'", expr_str, LIT(op.string), xt, yt);
+	gb_string_free(expr_str);
+	gb_string_free(yt);
+	gb_string_free(xt);
+	x->type = t_invalid;
+	x->mode = Addressing_Invalid;
+	return;
+	
+}
+
+
 void check_binary_expr(CheckerContext *c, Operand *x, Ast *node, Type *type_hint, bool use_lhs_as_type_hint=false) {
 	GB_ASSERT(node->kind == Ast_BinaryExpr);
 	Operand y_ = {}, *y = &y_;
@@ -2874,6 +2992,12 @@ void check_binary_expr(CheckerContext *c, Operand *x, Ast *node, Type *type_hint
 		x->type = y->type;
 		return;
 	}
+	if (is_type_matrix(x->type) || is_type_matrix(y->type)) {
+		check_binary_matrix(c, op, x, y, type_hint, use_lhs_as_type_hint);
+		return;
+	}
+
+	
 	if (!are_types_identical(x->type, y->type)) {
 		if (x->type != t_invalid &&
 		    y->type != t_invalid) {
@@ -3258,6 +3382,29 @@ void convert_to_typed(CheckerContext *c, Operand *operand, Type *target_type) {
 
 		break;
 	}
+	
+	case Type_Matrix: {
+		Type *elem = base_array_type(t);
+		if (check_is_assignable_to(c, operand, elem)) {
+			if (t->Matrix.row_count != t->Matrix.column_count) {
+				operand->mode = Addressing_Invalid;
+				begin_error_block();
+				defer (end_error_block());
+				
+				convert_untyped_error(c, operand, target_type);
+				error_line("\tNote: Only a square matrix types can be initialized with a scalar value\n");
+				return;
+			} else {
+				operand->mode = Addressing_Value;
+			}
+		} else {
+			operand->mode = Addressing_Invalid;
+			convert_untyped_error(c, operand, target_type);
+			return;
+		}
+		break;
+	}
+		
 
 	case Type_Union:
 		if (!is_operand_nil(*operand) && !is_operand_undef(*operand)) {