Keep shadow stacks to help heap checker unwind without frame pointers

build/common.gypi

 # Copyright (c) 2010 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files or targets should set chromium_code to 1 if they build
@@ skipping 247 matching lines @@
 
     # Enable TCMalloc.
     'linux_use_tcmalloc%': 1,
 
     # Disable TCMalloc's debugallocation.
     'linux_use_debugallocation%': 0,
 
     # Disable TCMalloc's heapchecker.
     'linux_use_heapchecker%': 0,
 
+    # Disable shadow stack keeping used by heapcheck to unwind the stacks
+    # better.
+    'linux_keep_shadow_stacks%': 0,
+
     # Set to 1 to turn on seccomp sandbox by default.
     # (Note: this is ignored for official builds.)
     'linux_use_seccomp_sandbox%': 0,
 
     # Set to 1 to link against libgnome-keyring instead of using dlopen().
     'linux_link_gnome_keyring%': 0,
 
     # Set to select the Title Case versions of strings in GRD files.
     'use_titlecase_in_grd_files%': 0,
 
@@ skipping 849 matching lines @@
           }],
           ['linux_use_heapchecker==1', {
             'variables': {'linux_use_tcmalloc%': 1},
           }],
           ['linux_use_tcmalloc==0', {
             'defines': ['NO_TCMALLOC'],
           }],
           ['linux_use_heapchecker==0', {
             'defines': ['NO_HEAPCHECKER'],
           }],
+          ['linux_keep_shadow_stacks==1', {
+            'defines': ['KEEP_SHADOW_STACKS'],
+            'cflags': ['-finstrument-functions'],
+          }],
         ],
       },
     }],
     # FreeBSD-specific options; note that most FreeBSD options are set above,
     # with Linux.
     ['OS=="freebsd"', {
       'target_defaults': {
         'ldflags': [
           '-Wl,--no-keep-memory',
         ],
@@ skipping 290 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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