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# Copyright (c) 2013 Google Inc. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Utility functions shared amongst the Windows generators."""
import copy
import os
# A dictionary mapping supported target types to extensions.
TARGET_TYPE_EXT = {
"executable": "exe",
"loadable_module": "dll",
"shared_library": "dll",
"static_library": "lib",
"windows_driver": "sys",
}
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] = f"{parts[0]}_{suffix}"
return "#".join(parts)
def _ShardName(name, number):
"""Add a shard number to the end of a target.
Arguments:
name: name of the target (foo#target)
number: shard number
Returns:
Target name with shard added (foo_1#target)
"""
return _SuffixName(name, str(number))
def ShardTargets(target_list, target_dicts):
"""Shard some targets apart to work around the linkers limits.
Arguments:
target_list: List of target pairs: 'base/base.gyp:base'.
target_dicts: Dict of target properties keyed on target pair.
Returns:
Tuple of the new sharded versions of the inputs.
"""
# Gather the targets to shard, and how many pieces.
targets_to_shard = {}
for t in target_dicts:
shards = int(target_dicts[t].get("msvs_shard", 0))
if shards:
targets_to_shard[t] = shards
# Shard target_list.
new_target_list = []
for t in target_list:
if t in targets_to_shard:
for i in range(targets_to_shard[t]):
new_target_list.append(_ShardName(t, i))
else:
new_target_list.append(t)
# Shard target_dict.
new_target_dicts = {}
for t in target_dicts:
if t in targets_to_shard:
for i in range(targets_to_shard[t]):
name = _ShardName(t, i)
new_target_dicts[name] = copy.copy(target_dicts[t])
new_target_dicts[name]["target_name"] = _ShardName(
new_target_dicts[name]["target_name"], i
)
sources = new_target_dicts[name].get("sources", [])
new_sources = []
for pos in range(i, len(sources), targets_to_shard[t]):
new_sources.append(sources[pos])
new_target_dicts[name]["sources"] = new_sources
else:
new_target_dicts[t] = target_dicts[t]
# Shard dependencies.
for t in sorted(new_target_dicts):
for deptype in ("dependencies", "dependencies_original"):
dependencies = copy.copy(new_target_dicts[t].get(deptype, []))
new_dependencies = []
for d in dependencies:
if d in targets_to_shard:
for i in range(targets_to_shard[d]):
new_dependencies.append(_ShardName(d, i))
else:
new_dependencies.append(d)
new_target_dicts[t][deptype] = new_dependencies
return (new_target_list, new_target_dicts)
def _GetPdbPath(target_dict, config_name, vars):
"""Returns the path to the PDB file that will be generated by a given
configuration.
The lookup proceeds as follows:
- Look for an explicit path in the VCLinkerTool configuration block.
- Look for an 'msvs_large_pdb_path' variable.
- Use '<(PRODUCT_DIR)/<(product_name).(exe|dll).pdb' if 'product_name' is
specified.
- Use '<(PRODUCT_DIR)/<(target_name).(exe|dll).pdb'.
Arguments:
target_dict: The target dictionary to be searched.
config_name: The name of the configuration of interest.
vars: A dictionary of common GYP variables with generator-specific values.
Returns:
The path of the corresponding PDB file.
"""
config = target_dict["configurations"][config_name]
msvs = config.setdefault("msvs_settings", {})
linker = msvs.get("VCLinkerTool", {})
pdb_path = linker.get("ProgramDatabaseFile")
if pdb_path:
return pdb_path
variables = target_dict.get("variables", {})
pdb_path = variables.get("msvs_large_pdb_path", None)
if pdb_path:
return pdb_path
pdb_base = target_dict.get("product_name", target_dict["target_name"])
pdb_base = "{}.{}.pdb".format(pdb_base, TARGET_TYPE_EXT[target_dict["type"]])
pdb_path = vars["PRODUCT_DIR"] + "/" + pdb_base
return pdb_path
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_name, config in shim_dict.get("configurations").items():
pdb_path = _GetPdbPath(target_dict, config_name, vars)
# A few keys that we don't want to propagate.
for key in ["msvs_precompiled_header", "msvs_precompiled_source", "test"]:
config.pop(key, None)
msvs = config.setdefault("msvs_settings", {})
# Update the compiler directives in the shim target.
compiler = msvs.setdefault("VCCLCompilerTool", {})
compiler["DebugInformationFormat"] = "3"
compiler["ProgramDataBaseFileName"] = pdb_path
# Set the explicit PDB path in the appropriate configuration of the
# original target.
config = target_dict["configurations"][config_name]
msvs = config.setdefault("msvs_settings", {})
linker = msvs.setdefault("VCLinkerTool", {})
linker["GenerateDebugInformation"] = "true"
linker["ProgramDatabaseFile"] = pdb_path
# Add the new targets. They must go to the beginning of the list so that
# the dependency generation works as expected in ninja.
target_list.insert(0, full_copy_target_name)
target_list.insert(0, 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)
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