Implement binary logical expressions

boot/stage6.elna

@@ -10,7 +10,8 @@
 #   The first parameter is in 88, the second in 84 and so forth.
 # - Unary negate operation, e.g. -5.
 # - Unary locical not operation "~".
-# - Binary addition "+".
+# - Binary addition "+" and multiplication "*".
+# - Binary logical operations: & (and), or and xor.
 
 .section .rodata
 
@@ -86,6 +87,15 @@ asm_neg: .string "\tneg "
 .type asm_not, @object
 asm_not: .string "\tnot "
 
+.type asm_and, @object
+asm_and: .string "\tand "
+
+.type asm_or, @object
+asm_or: .string "\tor "
+
+.type asm_xor, @object
+asm_xor: .string "\txor "
+
 .type asm_comma, @object
 asm_comma: .string ", "
 
@@ -695,6 +705,15 @@ begin
 	li t1, '*'
 	beq t0, t1, .compile_expression_mul
 
+	li t1, '&'
+	beq t0, t1, .compile_expression_and
+
+	li t1, 'o'
+	beq t0, t1, .compile_expression_or
+
+	li t1, 'x'
+	beq t0, t1, .compile_expression_xor
+
 	# Unknown binary operator.
 	unimp
 
@@ -728,6 +747,51 @@ begin
 
 	goto .compile_expression_end;
 
+.compile_expression_and:
+	_advance_token(1);
+	_compile_binary_rhs();
+
+	# Execute the operation.
+	_write_z(@asm_and);
+	_write_register('t', 0);
+	_write_z(@asm_comma);
+	_write_register('t', 0);
+	_write_z(@asm_comma);
+	_write_register('t', 1);
+	_write_c('\n');
+
+	goto .compile_expression_end;
+
+.compile_expression_or:
+	_advance_token(1);
+	_compile_binary_rhs();
+
+	# Execute the operation.
+	_write_z(@asm_or);
+	_write_register('t', 0);
+	_write_z(@asm_comma);
+	_write_register('t', 0);
+	_write_z(@asm_comma);
+	_write_register('t', 1);
+	_write_c('\n');
+
+	goto .compile_expression_end;
+
+.compile_expression_xor:
+	_advance_token(1);
+	_compile_binary_rhs();
+
+	# Execute the operation.
+	_write_z(@asm_xor);
+	_write_register('t', 0);
+	_write_z(@asm_comma);
+	_write_register('t', 0);
+	_write_z(@asm_comma);
+	_write_register('t', 1);
+	_write_c('\n');
+
+	goto .compile_expression_end;
+
 .compile_expression_end:
 end;
 
@@ -1229,6 +1293,6 @@ begin
 	_read_file(@source_code, 81920);
 	_compile();
 
-	_exit(2 * 3);
+	_exit(0);
 
 end;