Add src_to_binary_ext that returns addrs_syms

Author: ameeuw

Diff for: esp32_ulp/__init__.py

@@ -12,19 +12,20 @@
 from .link import make_binary
 garbage_collect('after import')
 
-
-def src_to_binary(src, cpu):
+def src_to_binary_ext(src, cpu):
     assembler = Assembler(cpu)
     src = preprocess(src)
     assembler.assemble(src, remove_comments=False)  # comments already removed by preprocessor
     garbage_collect('before symbols export')
     addrs_syms = assembler.symbols.export()
-    for addr, sym in addrs_syms:
-        print('%04d %s' % (addr, sym))
-
     text, data, bss_len = assembler.fetch()
-    return make_binary(text, data, bss_len)
+    return make_binary(text, data, bss_len), addrs_syms
 
+def src_to_binary(src, cpu):
+    binary, addrs_syms = src_to_binary_ext(src, cpu)
+    for addr, sym in addrs_syms:
+        print('%04d %s' % (addr, sym))
+    return binary
 
 def assemble_file(filename, cpu):
     with open(filename) as f: