Create msvs_large_pdb workaround.

pylib/gyp/MSVSUtil.py

Index: pylib/gyp/MSVSUtil.py
diff --git a/pylib/gyp/MSVSUtil.py b/pylib/gyp/MSVSUtil.py
index 41d7ab28907e1747d9a6409c8f9c57b787c677fc..5afcd1f2ab610ff740f208e2dec2fad934bd0aed 100644
--- a/pylib/gyp/MSVSUtil.py
+++ b/pylib/gyp/MSVSUtil.py
@@ -5,6 +5,55 @@
 """Utility functions shared amongst the Windows generators."""
 
 import copy
+import os
+
+
+_TARGET_TYPE_EXT = {
+  'executable': '.exe',
+  'shared_library': '.dll'
+}
+
+
+def _GetLargePdbShimCcPath():
+  """Returns the path of the large_pdb_shim.cc file."""
+  this_dir = os.path.abspath(os.path.dirname(__file__))
+  src_dir = os.path.abspath(os.path.join(this_dir, '..', '..'))
+  win_data_dir = os.path.join(src_dir, 'data', 'win')
+  large_pdb_shim_cc = os.path.join(win_data_dir, 'large-pdb-shim.cc')
+  return large_pdb_shim_cc
+
+
+def _DeepCopySomeKeys(in_dict, keys):
+  """Performs a partial deep-copy on |in_dict|, only copying the keys in |keys|.
+
+  Arguments:
+    in_dict: The dictionary to copy.
+    keys: The keys to be copied. If a key is in this list and doesn't exist in
+        |in_dict| this is not an error.
+  Returns:
+    The partially deep-copied dictionary.
+  """
+  d = {}
+  for key in keys:
+    if key not in in_dict:
+      continue
+    d[key] = copy.deepcopy(in_dict[key])
+  return d
+
+
+def _SuffixName(name, suffix):
+  """Add a suffix to the end of a target.
+
+  Arguments:
+    name: name of the target (foo#target)
+    suffix: the suffix to be added
+  Returns:
+    Target name with suffix added (foo_suffix#target)
+  """
+  parts = name.rsplit('#', 1)
+  parts[0] = '%s_%s' % (parts[0], suffix)
+  return '#'.join(parts)
+
 
 def _ShardName(name, number):
   """Add a shard number to the end of a target.
@@ -15,9 +64,7 @@ def _ShardName(name, number):
   Returns:
     Target name with shard added (foo_1#target)
   """
-  parts = name.rsplit('#', 1)
-  parts[0] = '%s_%d' % (parts[0], number)
-  return '#'.join(parts)
+  return _SuffixName(name, str(number))
 
 
 def ShardTargets(target_list, target_dicts):
@@ -72,3 +119,94 @@ def ShardTargets(target_list, target_dicts):
     new_target_dicts[t]['dependencies'] = new_dependencies
 
   return (new_target_list, new_target_dicts)
+
+
+def InsertLargePdbShims(target_list, target_dicts, vars):
+  """Insert a shim target that forces the linker to use 4KB pagesize PDBs.
+
+  This is a workaround for targets with PDBs greater than 1GB in size, the
+  limit for the 1KB pagesize PDBs created by the linker by default.
+
+  Arguments:
+    target_list: List of target pairs: 'base/base.gyp:base'.
+    target_dicts: Dict of target properties keyed on target pair.
+    vars: A dictionary of common GYP variables with generator-specific values.
+  Returns:
+    Tuple of the shimmed version of the inputs.
+  """
+  # Determine which targets need shimming.
+  targets_to_shim = []
+  for t in target_dicts:
+    target_dict = target_dicts[t]
+    # We only want to shim targets that have msvs_large_pdb enabled.
+    if not int(target_dict.get('msvs_large_pdb', 0)):
+      continue
+    # This is intended for executable, shared_library and loadable_module
+    # targets where every configuration is set up to produce a PDB output.
+    # If any of these conditions is not true then the shim logic will fail
+    # below.
+    targets_to_shim.append(t)
+
+  large_pdb_shim_cc = _GetLargePdbShimCcPath()
+
+  for t in targets_to_shim:
+    target_dict = target_dicts[t]
+    target_name = target_dict.get('target_name')
+
+    base_dict = _DeepCopySomeKeys(target_dict,
+          ['configurations', 'default_configuration', 'toolset'])
+
+    # This is the dict for copying the source file (part of the GYP tree)
+    # to the intermediate directory of the project. This is necessary because
+    # we can't always build a relative path to the shim source file (on Windows
+    # GYP and the project may be on different drives), and Ninja hates absolute
+    # paths (it ends up generating the .obj and .obj.d alongside the source
+    # file, polluting GYPs tree).
+    copy_suffix = '_large_pdb_copy'
+    copy_target_name = target_name + '_' + copy_suffix
+    full_copy_target_name = _SuffixName(t, copy_suffix)
+    shim_cc_basename = os.path.basename(large_pdb_shim_cc)
+    shim_cc_dir = vars['SHARED_INTERMEDIATE_DIR'] + '/' + copy_target_name
+    shim_cc_path = shim_cc_dir + '/' + shim_cc_basename
+    copy_dict = copy.deepcopy(base_dict)
+    copy_dict['target_name'] = copy_target_name
+    copy_dict['type'] = 'none'
+    copy_dict['sources'] = [ large_pdb_shim_cc ]
+    copy_dict['copies'] = [{
+      'destination': shim_cc_dir,
+      'files': [ large_pdb_shim_cc ]
+    }]
+
+    # This is the dict for the PDB generating shim target. It depends on the
+    # copy target.
+    shim_suffix = '_large_pdb_shim'
+    shim_target_name = target_name + '_' + shim_suffix
+    full_shim_target_name = _SuffixName(t, shim_suffix)
+    shim_dict = copy.deepcopy(base_dict)
+    shim_dict['target_name'] = shim_target_name
+    shim_dict['type'] = 'static_library'
+    shim_dict['sources'] = [ shim_cc_path ]
+    shim_dict['dependencies'] = [ full_copy_target_name ]
+
+    # Set up the shim to output its PDB to the same location as the final linker
+    # target.
+    for config in shim_dict.get('configurations').itervalues():
+      msvs = config.setdefault('msvs_settings')
+
+      linker = msvs.pop('VCLinkerTool')  # We want to clear this dict.
+      pdb_path = linker.get('ProgramDatabaseFile')
+
+      compiler = msvs.setdefault('VCCLCompilerTool', {})
+      compiler.setdefault('DebugInformationFormat', '3')
+      compiler.setdefault('ProgramDataBaseFileName', pdb_path)
+
+    # Add the new targets.
+    target_list.append(full_copy_target_name)
+    target_list.append(full_shim_target_name)
+    target_dicts[full_copy_target_name] = copy_dict
+    target_dicts[full_shim_target_name] = shim_dict
+
+    # Update the original target to depend on the shim target.
+    target_dict.setdefault('dependencies', []).append(full_shim_target_name)
+
+  return (target_list, target_dicts)