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..18ade139c59205d363d6925134842c39c6d6a845
--- /dev/null
+++ b/runtime/tools/bin_to_assembly.py
@@ -0,0 +1,94 @@
+#!/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.
+
+# Generates an assembly source file the defines a symbol with the bytes from
+# a given file.
+
+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", default=False)
+  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")
+    parser.print_help();
+    return -1
+  if not options.input:
+    sys.stderr.write("--input not specified\n")
+    parser.print_help();
+    return -1
+  if not os.path.isfile(options.input):
+    sys.stderr.write("input file does not exist: %s\n" % options.input)
+    parser.print_help();
+    return -1
+  if not options.symbol_name:
+    sys.stderr.write("--symbol_name not specified\n")
+    parser.print_help();
+    return -1
+  if not options.target_os:
+    sys.stderr.write("--target_os not specified\n")
+    parser.print_help();
+    return -1
+
+  with open(options.output, "w") as output_file:
+    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"]:
+      output_file.write("ifndef _ML64_X64\n")
+      output_file.write(".model flat, C\n")
+      output_file.write("endif\n")
+      if options.executable:
+        output_file.write(".code\n")
+      else:
+        output_file.write(".const\n")
+      output_file.write("public %s\n" % options.symbol_name)
+      output_file.write("%s label byte\n" % options.symbol_name)
+    else:
+      sys.stderr.write("Unknown target_os: %s" % options.target_os)
+      return -1
+
+    with open(options.input, "rb") as input_file:
+      if options.target_os in ["win"]:
+        for byte in input_file.read():
+          output_file.write("byte %d\n" % ord(byte))
+        output_file.write("end\n")
+      else:
+        for byte in input_file.read():
+          output_file.write(".byte %d\n" % ord(byte))
+
+  return 0
+
+if __name__ == "__main__":
+  sys.exit(Main())