Add a postbuild action for executables built with ASan on Mac OS.

The action will copy the ASan dynamic runtime to the same dir where
the executable is.

BUG=170629
Review URL: https://codereview.chromium.org/11642018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@187297 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 114 insertions, 0 deletions

diff --git a/build/all.gyp b/build/all.gyp
index 58e8b09..a071908 100644
--- a/build/all.gyp
+++ b/build/all.gyp
@@ -11,6 +11,7 @@
       'dependencies': [
         'some.gyp:*',
         '../base/base.gyp:*',
+        '../build/mac/asan.gyp:*',
         '../chrome/chrome.gyp:*',
         '../content/content.gyp:*',
         '../crypto/crypto.gyp:*',
diff --git a/build/common.gypi b/build/common.gypi
index f22c58c..c861e63 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1658,6 +1658,11 @@
     # throughout the codebase.
     'defines' : ['USE_SKIA'],
     'conditions': [
+      ['asan==1', {
+        'dependencies': [
+          '<(DEPTH)/build/mac/asan.gyp:asan_dynamic_runtime',
+        ],
+      }],
       ['OS=="linux" and linux_use_tcmalloc==1 and clang_type_profiler==1', {
         'cflags_cc!': ['-fno-rtti'],
         'cflags_cc+': [
@@ -3530,6 +3535,29 @@
           }],
           ['_mac_bundle', {
             'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-ObjC']},
+            'target_conditions': [
+              ['_type=="executable"', {
+                'conditions': [
+                  ['asan==1', {
+                    'postbuilds': [
+                      {
+                        'variables': {
+                          # Define copy_asan_dylib_path in a variable ending in
+                          # _path so that gyp understands it's a path and
+                          # performs proper relativization during dict merging.
+                          'copy_asan_dylib_path':
+                            'mac/copy_asan_runtime_dylib.sh',
+                        },
+                        'postbuild_name': 'Copy ASan runtime dylib',
+                        'action': [
+                          '<(copy_asan_dylib_path)',
+                        ],
+                      },
+                    ],
+                  }],
+                ],
+              }],
+            ],
           }],
         ],  # target_conditions
       },  # target_defaults
diff --git a/build/mac/asan.gyp b/build/mac/asan.gyp
new file mode 100644
index 0000000..4a0cef9
--- /dev/null
+++ b/build/mac/asan.gyp
@@ -0,0 +1,32 @@
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+   'targets': [
+     {
+       'target_name': 'asan_dynamic_runtime',
+       'type': 'none',
+       'variables': {
+         # Every target is going to depend on asan_dynamic_runtime, so allow
+         # this one to depend on itself.
+         'prune_self_dependency': 1,
+         # Path is relative to this GYP file.
+         'asan_rtl_mask_path':
+             '../../third_party/llvm-build/Release+Asserts/lib/clang/*/lib/darwin/libclang_rt.asan_osx_dynamic.dylib',
+       },
+       'conditions': [
+         ['OS=="mac"', {
+           'copies': [
+             {
+               'destination': '<(PRODUCT_DIR)',
+               'files': [
+                 '<!(/bin/ls <(asan_rtl_mask_path))',
+               ],
+             },
+           ],
+         }],
+       ],
+     },
+   ],
+}
diff --git a/build/mac/copy_asan_runtime_dylib.sh b/build/mac/copy_asan_runtime_dylib.sh
new file mode 100755
index 0000000..beefe79
--- /dev/null
+++ b/build/mac/copy_asan_runtime_dylib.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# For app bundles built with ASan, copies the runtime lib
+# (libclang_rt.asan_osx_dynamic.dylib), on which their executables depend, from
+# the compiler installation path to appname.app/Contents/Resources and fixes the
+# dylib's install name in the binary to be relative to @executable_path.
+
+set -e
+
+BINARY="${BUILT_PRODUCTS_DIR}/${EXECUTABLE_PATH}"
+BINARY_DIR="$(dirname "${BINARY}")"
+ASAN_DYLIB_NAME=libclang_rt.asan_osx_dynamic.dylib
+ASAN_DYLIB=$(find \
+    "${BUILT_PRODUCTS_DIR}/../../third_party/llvm-build/Release+Asserts/lib/clang/" \
+    -type f -path "*${ASAN_DYLIB_NAME}")
+
+# Find the link to the ASan runtime encoded in the binary.
+BUILTIN_DYLIB_PATH=$(otool -L "${BINARY}" | \
+    sed -Ene 's/^[[:blank:]]+(.*libclang_rt\.asan_osx_dynamic\.dylib).*$/\1/p')
+
+if [[ -z "${BUILTIN_DYLIB_PATH}" ]]; then
+  echo "${BINARY} does not depend on the ASan runtime library!" >&2
+  # TODO(glider): make this return 1 when we fully switch to the dynamic
+  # runtime in ASan.
+  exit 0
+fi
+
+DYLIB_BASENAME=$(basename "${ASAN_DYLIB}")
+if [[ "${DYLIB_BASENAME}" != "${ASAN_DYLIB_NAME}" ]]; then
+  echo "basename(${ASAN_DYLIB}) != ${ASAN_DYLIB_NAME}" >&2
+  exit 1
+fi
+
+LIBRARIES_DIR="$(dirname "${BINARY_DIR}")/Libraries"
+mkdir -p "${LIBRARIES_DIR}"
+cp "${ASAN_DYLIB}" "${LIBRARIES_DIR}"
+
+NEW_LC_ID_DYLIB="@executable_path/../Libraries/${ASAN_DYLIB_NAME}"
+
+# Make LC_ID_DYLIB of the runtime copy point to its location.
+install_name_tool \
+    -id "${NEW_LC_ID_DYLIB}" \
+    "${LIBRARIES_DIR}/${ASAN_DYLIB_NAME}"
+
+# Fix the rpath to the runtime library recorded in the binary.
+install_name_tool \
+    -change "${BUILTIN_DYLIB_PATH}" \
+    "${NEW_LC_ID_DYLIB}" \
+    "${BINARY}"