Add Om1 lowering with no optimizations.
This adds infrastructure for low-level x86-32 instructions, and the target lowering patterns.
Practically no optimizations are performed. Optimizations to be introduced later include liveness analysis, dead-code elimination, global linear-scan register allocation, linear-scan based stack slot coalescing, and compare/branch fusing. One optimization that is present is simple coalescing of stack slots for variables that are only live within a single basic block.
There are also some fairly comprehensive cross tests. This testing infrastructure translates bitcode using both Subzero and llc, and a testing harness calls both versions with a variety of "interesting" inputs and compares the results. Specifically, Arithmetic, Icmp, Fcmp, and Cast instructions are tested this way, across all PNaCl primitive types.
BUG=
R=jvoung@chromium.org
Review URL: https://codereview.chromium.org/265703002
diff --git a/pydir/build-pnacl-ir.py b/pydir/build-pnacl-ir.py
new file mode 100755
index 0000000..67dbefd
--- /dev/null
+++ b/pydir/build-pnacl-ir.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python2
+
+import argparse
+import os
+import sys
+import tempfile
+from utils import shellcmd
+
+if __name__ == '__main__':
+ argparser = argparse.ArgumentParser()
+ argparser.add_argument('cfile', nargs='+', type=str,
+ help='C file(s) to convert')
+ argparser.add_argument('--nacl_sdk_root', nargs='?', type=str,
+ help='Path to NACL_SDK_ROOT')
+ argparser.add_argument('--dir', nargs='?', type=str, default='.',
+ help='Output directory')
+ argparser.add_argument('--disable-verify', action='store_true')
+ args = argparser.parse_args()
+
+ nacl_sdk_root = os.environ.get('NACL_SDK_ROOT', None)
+ if args.nacl_sdk_root:
+ nacl_sdk_root = os.path.expanduser(args.nacl_sdk_root)
+
+ if not nacl_sdk_root or not os.path.exists(nacl_sdk_root):
+ print '''\
+Please set the NACL_SDK_ROOT environment variable or pass the path through
+--nacl_sdk_root to point to a valid Native Client SDK installation.'''
+ sys.exit(1)
+
+ includes_path = os.path.join(nacl_sdk_root, 'include')
+ toolchain_path = os.path.join(nacl_sdk_root, 'toolchain', 'linux_pnacl')
+ clang_path = os.path.join(toolchain_path, 'bin64', 'pnacl-clang')
+ opt_path = os.path.join(toolchain_path, 'host_x86_64', 'bin', 'opt')
+
+ tempdir = tempfile.mkdtemp()
+
+ for cname in args.cfile:
+ basename = os.path.splitext(cname)[0]
+ llname = os.path.join(tempdir, basename + '.ll')
+ pnaclname = basename + '.pnacl.ll'
+ pnaclname = os.path.join(args.dir, pnaclname)
+
+ shellcmd(clang_path + ' -I{0} -c {1} -o {2}'.format(
+ includes_path, cname, llname))
+ shellcmd(opt_path +
+ ' -O2 -pnacl-abi-simplify-preopt -pnacl-abi-simplify-postopt' +
+ ('' if args.disable_verify else
+ ' -verify-pnaclabi-module -verify-pnaclabi-functions') +
+ ' -pnaclabi-allow-debug-metadata -disable-simplify-libcalls'
+ ' {0} -S -o {1}'.format(llname, pnaclname))
