Incorporate shimming into the irt

src/untrusted/irt/nacl.scons

Index: src/untrusted/irt/nacl.scons
===================================================================
--- src/untrusted/irt/nacl.scons	(revision 9585)
+++ src/untrusted/irt/nacl.scons	(working copy)
@@ -3,6 +3,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import os
 
 Import('env')
 
@@ -11,7 +12,11 @@
   raise UserError('src/untrusted/irt/nacl.scons in the wrong environment?')
 
 blob_env = env.Clone()
-blob_env.Append(LINKFLAGS='-Wl,--section-start,.rodata=${IRT_BLOB_DATA_START}')
+blob_env.Append(LINKFLAGS='-Wl,--section-start,.rodata=${IRT_BLOB_DATA_START}',
+                # TODO(robertm): This define should be removed once
+                # the IRT shim build has migrated to the Chrome tree.
+                CPPDEFINES=['ENABLE_NACL_IRT_PPAPIHOOK_SHIMMED'])
+
 # The PNaCl linker (gold) does not implement the "-Ttext-segment"
 # option.  However, with the linker for x86, the "-Ttext" option does
 # not affect the executable's base address.
@@ -112,9 +117,34 @@
             'm',
             ]
 
+# We may want to move this into ppruntime in the future to limit
+# visibility to ppapi/generators
+def GetPNaClShimSource(env):
+  if not env.Bit('target_x86_64'):
+    return 'shim_dummy.c'
+
+  # Generate a 'pnacl_shim.c'
+  # API code
+  api_glob = env.Glob('${SOURCE_ROOT}/ppapi/api/*.idl')
+  api_dev_glob = env.Glob('${SOURCE_ROOT}/ppapi/api/dev/*.idl')
+  all_api = [f.abspath for f in api_glob + api_dev_glob]
+  # Python code
+  generators_glob = env.Glob('${SOURCE_ROOT}/ppapi/generators/*.py')
+  return env.Command(
+      'pnacl_irt_shim.c',
+      (api_glob + api_dev_glob + generators_glob),
+      ('${PYTHON} ' +
+       '${SOURCE_ROOT}/ppapi/generators/generator.py ' +
+       '--srcroot=' + os.path.join('${SOURCE_ROOT}', 'ppapi', 'api') + ' ' +
+       '--wnone --pnacl --pnaclshim=${TARGETS} ' + ' '.join(all_api)))
+
+irt_shim_obj = blob_env.ComponentObject(GetPNaClShimSource(blob_env))
+
+
 def LinkIrt(output, files, libs):
   return blob_env.ComponentProgram(output,
-                                   [irt_entry_obj] + irt_support_objs + files,
+                                   [irt_entry_obj, irt_shim_obj] +
+                                   irt_support_objs + files,
                                    EXTRA_LIBS=libs + irt_libs)
 
 irt_core_library = LinkIrt('irt_core', irt_nonbrowser, [])