Add support for print from runtime.c.

llvm_emulator/stepper.py

@@ -25,7 +25,10 @@ class Garbage(Enum):
         return '<<Garbage>>'
 
 
-builtins = ['allocRecord', 'initArray']
+builtins = ['allocRecord', 'initArray', 'stringEqual', 'stringNotEq', 'stringLess',
+            'stringLessEq', 'stringGreater', 'stringGreaterEq', 'exponent', 'print',
+            'flush', 'getChar', 'ord', 'chr', 'size', 'substring', 'concat', 'not',
+            'exit_tig']
 
 
 def step(insns, terminator, blocks, stack_frames, ssa_env, global_env, heap,
@@ -580,6 +583,18 @@ def emulate_builtin(name, arguments_v, ssa_env, heap):
                           struct_begin + 1, array_begin,
                           array_init_s))
             res = struct_begin
+    elif name == 'print':
+        if len(arguments_v) != 2:
+            err('Number of arguments to {} should be 3'
+                .format(name))
+        else:
+            struct_begin = arguments_v[1]
+            print('Printing string, heap[{}]:'
+                  .format(struct_begin))
+            printee = heap[struct_begin + 1]
+            print(printee)
+            if not isinstance(printee, str):
+                warn('What was printed, was not stored as a string in the heap')
     elif name in builtins:
         TODO('Have not implemented builtin function {}, yet.'
              .format(name))