Modify pnacl subzero to be able to read pnacl bitcode files.

llvm2iceinsts.py

+#!/usr/bin/env python2
+
+import argparse
+import os, sys
+import itertools
+import subprocess
+import re

[Jim Stichnoth, 2014/05/14 21:45:18]

Sort imports alphabetically.  (I know some or all files already had this
mistake...)

[Karl, 2014/05/14 21:56:57]

Done.

+
+for p in sys.path:
+    if p.endswith('/toolchain_build/src/pnacl-subzero'):
+        sys.path.insert(0, p + '/pydir')
+        break
+
+from utils import shellcmd
+
+if __name__ == '__main__':
+    """Runs commands"""

[Jim Stichnoth, 2014/05/14 21:45:18]

More descriptive description.

[Karl, 2014/05/14 21:56:57]

Done.

+    desc = 'Run llvm2ice on llvm file to produce ice instructions.'

[Jim Stichnoth, 2014/05/14 21:45:18]

I've been trying to use all-capitalized ICE in textual descriptions.  (Never
mind that ICE doesn't actually stand for anything, yet...)

[Karl, 2014/05/14 21:56:57]

Done.

+    argparser = argparse.ArgumentParser(description=desc)
+    argparser.add_argument(
+        '--llvm2ice', required=False, default='./llvm2ice', metavar='LLVM2ICE',
+        help='Path to llvm2ice driver program [default ./llvm2ice]')
+    argparser.add_argument('--llvm-bin-path', required=False,
+                           default=None, metavar='LLVM_BIN_PATH',
+                           help='Path to LLVM executables ' +
+                                '(for to building PNaCl files)')

[Jim Stichnoth, 2014/05/14 21:45:18]

for to --> for

[Karl, 2014/05/14 21:56:57]

Done.

+    argparser.add_argument('--pnacl', required=False,
+                           action='store_true',
+                           help='Convert llvm source to PNaCl bitcode ' +
+                                'file first')
+    argparser.add_argument('--echo-cmd', required=False,
+                           action='store_true',
+                           help='Trace command that generates ice instructions')

[Jim Stichnoth, 2014/05/14 21:45:18]

ice --> ICE

[Karl, 2014/05/14 21:56:57]

Done.

+    argparser.add_argument('llfile', nargs=1,
+                           metavar='LLVM_FILE',
+                           help='Llvm source file')
+    args = argparser.parse_args()
+    llvm_bin_path = args.llvm_bin_path
+    llfile = args.llfile[0]
+
+    cmd = []
+    if args.pnacl:
+      cmd = [os.path.join(llvm_bin_path, 'llvm-as'), llfile, '-o', '-', '|',
+             os.path.join(llvm_bin_path, 'pnacl-freeze'),
+             '--allow-local-symbol-tables', '|']
+    cmd += [args.llvm2ice, '-verbose', 'inst', '-notranslate']
+    if args.pnacl:
+      cmd += ['--allow-local-symbol-tables', '--bitcode-format=pnacl']
+    else:
+      cmd.append(llfile)
+
+    stdout_result = shellcmd(cmd, echo=args.echo_cmd)
+    if not args.echo_cmd:
+      sys.stdout.write(stdout_result)