win: Support reading process info cross-bitness

util/util.gyp

Index: util/util.gyp
diff --git a/util/util.gyp b/util/util.gyp
index ba72b15c4454d30f67b335ff5db433e63b3c8e5e..28d695d7520ea5cf4a650403a974264e18e46ea5 100644
--- a/util/util.gyp
+++ b/util/util.gyp
@@ -131,6 +131,7 @@
         'synchronization/semaphore.h',
         'win/process_info.cc',
         'win/process_info.h',
+        'win/process_structs.h',
         'win/scoped_handle.cc',
         'win/scoped_handle.h',
         'win/time.cc',
@@ -342,7 +343,7 @@
     ['OS=="win"', {
       'targets': [
         {
-          'target_name': 'util_test_process_info_test_child',
+          'target_name': 'util_test_process_info_test_child_x64',

[Mark Mentovai, 2015/03/09 22:44:44]

Do you want to add a TargetMachine: 17 definition here so that this _x64
executable is independent of the bitness chosen by common.gypi? If not, the
target name is a misnomer.

[scottmg, 2015/03/09 23:23:57]

Good point, done. Needed an msvs_configuration_platform too.

           'type': 'executable',
           'sources': [
             'win/process_info_test_child.cc',
@@ -359,6 +360,27 @@
             },
           },
         },
+        {
+          # Same as above, but explicitly x86 to test 64->32 access.
+          'target_name': 'util_test_process_info_test_child_x86',
+          'type': 'executable',
+          'sources': [
+            'win/process_info_test_child.cc',
+          ],
+          'msvs_configuration_platform': 'x86',
+          # Set an unusually high load address to make sure that the main
+          # executable still appears as the first element in
+          # ProcessInfo::Modules().
+          'msvs_settings': {
+            'VCLinkerTool': {
+              'AdditionalOptions': [
+                '/BASE:0x78000000',
+                '/FIXED',
+              ],
+              'TargetMachine': '1',  # x86.
+            },
+          },
+        },
       ]
     }],
   ],