Add BUILD.gn rules to compile third_party/class-dump.

Add third_party/class-dump/BUILD.gn to build class-dump as a host tool as
part of the iOS build.

Create a template "class_dump" (in third_party/class-dump/class-dump.gni)
to simplify the execution of the class-dump tool on given framework. This
required converting testing/iossim/redirect-stdout.sh to a python script
as gn can only invokes python script.

TBR=rohitrao@chromium.org
BUG=594519

Review URL: https://codereview.chromium.org/1806523002

Cr-Commit-Position: refs/heads/master@{#381687}

2 files changed, 38 insertions, 60 deletions

diff --git a/testing/iossim/iossim.gyp b/testing/iossim/iossim.gyp
index 2a8c2ae..d6bb4ea 100644
--- a/testing/iossim/iossim.gyp
+++ b/testing/iossim/iossim.gyp
@@ -6,6 +6,8 @@
   'variables': {
     'mac_deployment_target': '10.9',
     'mac_sdk_min': '10.9',
+    'class_dump_bin': '<(PRODUCT_DIR)/class-dump',
+    'class_dump_py': '<(DEPTH)/third_party/class-dump/class-dump.py',
   },
   'conditions': [
     ['OS!="ios" or "<(GENERATOR)"!="xcode" or "<(GENERATOR_FLAVOR)"=="ninja"', {
@@ -33,65 +35,66 @@
           ],
           'actions': [
             {
-              'action_name': 'generate_dvt_foundation_header',
+              'action_name': 'generate_dvt_core_simulator',
               'inputs': [
-                '<(iphone_sim_path)/DVTFoundation.framework/Versions/Current/DVTFoundation',
-                '<(PRODUCT_DIR)/class-dump',
+                '<(class_dump_bin)',
+                '<(class_dump_py)',
+                '<(developer_dir)/Library/PrivateFrameworks/CoreSimulator.framework/Versions/Current/CoreSimulator',
               ],
               'outputs': [
-                '<(INTERMEDIATE_DIR)/iossim/DVTFoundation.h'
+                '<(INTERMEDIATE_DIR)/iossim/CoreSimulator.h'
               ],
               'action': [
-                # Actions don't provide a way to redirect stdout, so a custom
-                # script is invoked that will execute the first argument and
-                # write the output to the file specified as the second argument.
-                # -I sorts classes, categories, and protocols by inheritance.
-                # -C <regex> only displays classes matching regular expression.
-                './redirect-stdout.sh',
-                '<(PRODUCT_DIR)/class-dump -CDVTStackBacktrace|DVTInvalidation|DVTMixIn <(iphone_sim_path)/DVTFoundation.framework',
-                '<(INTERMEDIATE_DIR)/iossim/DVTFoundation.h',
+                'python',
+                '<(class_dump_py)',
+                '-t', '<(class_dump_bin)',
+                '-o', '<(INTERMEDIATE_DIR)/iossim/CoreSimulator.h',
+                '--',
+                '-CSim',
+                '<(developer_dir)/Library/PrivateFrameworks/CoreSimulator.framework',
               ],
-              'message': 'Generating DVTFoundation.h',
+              'message': 'Generating CoreSimulator.h',
             },
             {
-              'action_name': 'generate_dvt_core_simulator',
+              'action_name': 'generate_dvt_foundation_header',
               'inputs': [
-                '<(developer_dir)/Library/PrivateFrameworks/CoreSimulator.framework/Versions/Current/CoreSimulator',
-                '<(PRODUCT_DIR)/class-dump',
+                '<(class_dump_bin)',
+                '<(class_dump_py)',
+                '<(iphone_sim_path)/DVTFoundation.framework/Versions/Current/DVTFoundation',
               ],
               'outputs': [
-                '<(INTERMEDIATE_DIR)/iossim/CoreSimulator.h'
+                '<(INTERMEDIATE_DIR)/iossim/DVTFoundation.h'
               ],
               'action': [
-                # Actions don't provide a way to redirect stdout, so a custom
-                # script is invoked that will execute the first argument and
-                # write the output to the file specified as the second argument.
-                # -I sorts classes, categories, and protocols by inheritance.
-                # -C <regex> only displays classes matching regular expression.
-                './redirect-stdout.sh',
-                '<(PRODUCT_DIR)/class-dump -CSim <(developer_dir)/Library/PrivateFrameworks/CoreSimulator.framework',
-                '<(INTERMEDIATE_DIR)/iossim/CoreSimulator.h',
+                'python',
+                '<(class_dump_py)',
+                '-t', '<(class_dump_bin)',
+                '-o', '<(INTERMEDIATE_DIR)/iossim/DVTFoundation.h',
+                '--',
+                '-CDVTStackBacktrace|DVTInvalidation|DVTMixIn',
+                '<(iphone_sim_path)/DVTFoundation.framework',
               ],
-              'message': 'Generating CoreSimulator.h',
+              'message': 'Generating DVTFoundation.h',
             },
             {
               'action_name': 'generate_dvt_iphone_sim_header',
               'inputs': [
+                '<(class_dump_bin)',
+                '<(class_dump_py)',
                 '<(iphone_sim_path)/DVTiPhoneSimulatorRemoteClient.framework/Versions/Current/DVTiPhoneSimulatorRemoteClient',
-                '<(PRODUCT_DIR)/class-dump',
               ],
               'outputs': [
                 '<(INTERMEDIATE_DIR)/iossim/DVTiPhoneSimulatorRemoteClient.h'
               ],
               'action': [
-                # Actions don't provide a way to redirect stdout, so a custom
-                # script is invoked that will execute the first argument and
-                # write the output to the file specified as the second argument.
-                # -I sorts classes, categories, and protocols by inheritance.
-                # -C <regex> only displays classes matching regular expression.
-                './redirect-stdout.sh',
-                '<(PRODUCT_DIR)/class-dump -I -CiPhoneSimulator <(iphone_sim_path)/DVTiPhoneSimulatorRemoteClient.framework',
-                '<(INTERMEDIATE_DIR)/iossim/DVTiPhoneSimulatorRemoteClient.h',
+                'python',
+                '<(class_dump_py)',
+                '-t', '<(class_dump_bin)',
+                '-o', '<(INTERMEDIATE_DIR)/iossim/DVTiPhoneSimulatorRemoteClient.h',
+                '--',
+                '-I',
+                '-CiPhoneSimulator',
+                '<(iphone_sim_path)/DVTiPhoneSimulatorRemoteClient.framework',
               ],
               'message': 'Generating DVTiPhoneSimulatorRemoteClient.h',
             },
diff --git a/testing/iossim/redirect-stdout.sh b/testing/iossim/redirect-stdout.sh
deleted file mode 100755
index 4465503..0000000
--- a/testing/iossim/redirect-stdout.sh
+++ /dev/null
@@ -1,25 +0,0 @@
-#!/bin/sh
-# 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.
-#
-# This script executes the command given as the first argument, strips
-# cxx_destruct from stdout, and redirects the remaining stdout to the file given
-# as the second argument.
-#
-# Example: Write the text 'foo' to a file called out.txt:
-#   RedirectStdout.sh "echo foo" out.txt
-#
-# This script is invoked from iossim.gyp in order to redirect the output of
-# class-dump to a file (because gyp actions don't support redirecting output).
-# This script also removes all lines with cxx_destruct. Perhaps newer versions
-# of class-dump will fix this issue.  As of 3.5, 'cxx_destruct' still exists.
-
-if [ ${#} -ne 2 ] ; then
-  echo "usage: ${0} <command> <output file>"
-  exit 2
-fi
-
-echo "// Treat class-dump output as a system header." > $2
-echo "#pragma clang system_header" >> $2
-$1 | sed /cxx_destruct/d >> $2