mirror of
https://github.com/bazelbuild/rules_cc
synced 2024-11-27 20:43:26 +00:00
131 lines
4.8 KiB
Python
131 lines
4.8 KiB
Python
# Copyright 2024 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Implementation of cc_tool_map."""
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load(
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"//cc/toolchains/impl:collect.bzl",
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"collect_provider",
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"collect_tools",
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)
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load(
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":cc_toolchain_info.bzl",
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"ActionTypeSetInfo",
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"ToolConfigInfo",
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)
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def _cc_tool_map_impl(ctx):
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tools = collect_tools(ctx, ctx.attr.tools)
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action_sets = collect_provider(ctx.attr.actions, ActionTypeSetInfo)
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action_to_tool = {}
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action_to_as = {}
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for i in range(len(action_sets)):
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action_set = action_sets[i]
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tool = tools[ctx.attr.tool_index_for_action[i]]
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for action in action_set.actions.to_list():
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if action in action_to_as:
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fail("The action %s appears multiple times in your tool_map (as %s and %s)" % (action.label, action_set.label, action_to_as[action].label))
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action_to_as[action] = action_set
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action_to_tool[action] = tool
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return [ToolConfigInfo(label = ctx.label, configs = action_to_tool)]
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_cc_tool_map = rule(
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implementation = _cc_tool_map_impl,
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# @unsorted-dict-items
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attrs = {
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"actions": attr.label_list(
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providers = [ActionTypeSetInfo],
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mandatory = True,
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doc = """A list of action names to apply this action to.
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See //cc/toolchains/actions:BUILD for valid options.
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""",
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),
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"tools": attr.label_list(
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mandatory = True,
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cfg = "exec",
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allow_files = True,
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doc = """The tool to use for the specified actions.
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The tool may be a `cc_tool` or other executable rule.
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""",
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),
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"tool_index_for_action": attr.int_list(
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mandatory = True,
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doc = """The index of the tool in `tools` for the action in `actions`.""",
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),
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},
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provides = [ToolConfigInfo],
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)
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def cc_tool_map(name, tools, **kwargs):
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"""A toolchain configuration rule that maps toolchain actions to tools.
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A `cc_tool_map` aggregates all the tools that may be used for a given toolchain
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and maps them to their corresponding actions. Conceptually, this is similar to the
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`CXX=/path/to/clang++` environment variables that most build systems use to determine which
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tools to use for a given action. To simplify usage, some actions have been grouped together (for
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example,
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[@rules_cc//cc/toolchains/actions:cpp_compile_actions](https://github.com/bazelbuild/rules_cc/tree/main/cc/toolchains/actions/BUILD)) to
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logically express "all the C++ compile actions".
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In Bazel, there is a little more granularity to the mapping, so the mapping doesn't follow the
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traditional `CXX`, `AR`, etc. naming scheme. For a comprehensive list of all the well-known
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actions, see //cc/toolchains/actions:BUILD.
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Example usage:
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```
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load("//cc/toolchains:tool_map.bzl", "cc_tool_map")
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cc_tool_map(
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name = "all_tools",
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tools = {
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"//cc/toolchains/actions:assembly_actions": ":asm",
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"//cc/toolchains/actions:c_compile": ":clang",
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"//cc/toolchains/actions:cpp_compile_actions": ":clang++",
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"//cc/toolchains/actions:link_actions": ":lld",
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"//cc/toolchains/actions:objcopy_embed_data": ":llvm-objcopy",
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"//cc/toolchains/actions:strip": ":llvm-strip",
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"//cc/toolchains/actions:ar_actions": ":llvm-ar",
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},
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)
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```
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Args:
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name: (str) The name of the target.
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tools: (Dict[Label, Label]) A mapping between
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`cc_action_type`/`cc_action_type_set` targets
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and the `cc_tool` or executable target that implements that action.
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**kwargs: [common attributes](https://bazel.build/reference/be/common-definitions#common-attributes) that should be applied to this rule.
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"""
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actions = []
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tool_index_for_action = []
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deduplicated_tools = {}
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for action, tool in tools.items():
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actions.append(action)
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label = native.package_relative_label(tool)
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if label not in deduplicated_tools:
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deduplicated_tools[label] = len(deduplicated_tools)
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tool_index_for_action.append(deduplicated_tools[label])
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_cc_tool_map(
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name = name,
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actions = actions,
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tools = deduplicated_tools.keys(),
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tool_index_for_action = tool_index_for_action,
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**kwargs
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)
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