Use assembly instead of C array literals to link the core snapshot into the VM.

runtime/tools/bin_to_assembly.py

Index: runtime/tools/bin_to_assembly.py
diff --git a/runtime/tools/bin_to_assembly.py b/runtime/tools/bin_to_assembly.py
new file mode 100755
index 0000000000000000000000000000000000000000..fd41f4dfe238893f329281b70eed5091c65d438e
--- /dev/null
+++ b/runtime/tools/bin_to_assembly.py
@@ -0,0 +1,78 @@
+#!/usr/bin/env python
+#
+# Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+

[zra, 2017/05/24 16:20:30]

Please add a comment explaining what this script does.

[rmacnak, 2017/05/24 19:26:45]

Done.

+import os
+import sys
+from optparse import OptionParser
+
+def Main():
+  parser = OptionParser()
+  parser.add_option("--output",
+                    action="store", type="string",
+                    help="output assembly file name")
+  parser.add_option("--input",
+                    action="store", type="string",
+                    help="input binary blob file")
+  parser.add_option("--symbol_name",
+                    action="store", type="string")
+  parser.add_option("--executable",
+                    action="store_true")
+  parser.set_defaults(executable=False)

[zra, 2017/05/24 16:20:27]

maybe instead add 'default=True' to the add_option()?

[rmacnak, 2017/05/24 19:26:45]

Done.

+  parser.add_option("--target_os",
+                    action="store", type="string")
+
+  (options, args) = parser.parse_args()
+  if not options.output:
+    sys.stderr.write('--output not specified\n')

[zra, 2017/05/24 16:20:29]

parser.print_help()

[rmacnak, 2017/05/24 19:26:45]

Done.

+    return -1
+  if not options.input:

[zra, 2017/05/24 16:20:27]

or not os.path.isfile(options.input)

+    sys.stderr.write('--input not specified\n')

[zra, 2017/05/24 16:20:29]

parser.print_help()

+    return -1
+  if not options.symbol_name:
+    sys.stderr.write('--symbol_name not specified\n')

[zra, 2017/05/24 16:20:27]

ditto

+    return -1
+  if not options.target_os:

[zra, 2017/05/24 16:20:27]

or options.target_os not in [...]:

+    sys.stderr.write('--target_os not specified\n')

[zra, 2017/05/24 16:20:28]

parser.print_help()

+    return -1
+
+  output_file = open(options.output, 'w')

[zra, 2017/05/24 16:20:26]

with open(options.output) as output_file:

[rmacnak, 2017/05/24 19:26:45]

Done.

+  if options.target_os in ["mac", "ios"]:
+    if options.executable:
+      output_file.write(".text\n")
+    else:
+      output_file.write(".const\n")
+    output_file.write(".global _%s\n" % options.symbol_name)
+    output_file.write(".balign 32\n")
+    output_file.write("_%s:\n" % options.symbol_name)
+  elif options.target_os in ["linux", "android", "fuchsia"]:
+    if options.executable:
+      output_file.write(".text\n")
+    else:
+      output_file.write(".section .rodata\n")
+    output_file.write(".global %s\n" % options.symbol_name)
+    output_file.write(".balign 32\n")
+    output_file.write("%s:\n" % options.symbol_name)
+  elif options.target_os in ["win"]:
+    if options.executable:
+      output_file.write(".text\n")
+    else:
+      output_file.write(".rdata\n")
+    output_file.write(".globl %s\n" % options.symbol_name)
+    output_file.write(".align 32\n")
+    output_file.write("%s:\n" % options.symbol_name)
+  else:
+    raise Exception("Unknown target_os: %s" % options.target_os)
+
+
+  input_file = open(options.input, 'rb')

[zra, 2017/05/24 16:20:28]

with open(options.input, 'rb') as input_file:

[rmacnak, 2017/05/24 19:26:45]

Done.

+  for byte in input_file.read():
+    output_file.write(".byte %d\n" % ord(byte))
+
+  input_file.close();
+  output_file.close();

[zra, 2017/05/24 16:20:29]

return 0

[rmacnak, 2017/05/24 19:26:45]

Done.

[rmacnak, 2017/05/24 19:26:46]

Done.

+
+if __name__ == '__main__':
+  sys.exit(Main())