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# This file is licensed under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
"""A rule to expand LLVM target enumerations.
Replaces in a text file a single variable of the style `@LLVM_ENUM_FOOS@` with a
list of macro invocations, one for each target on its own line:
```
LLVM_FOO(TARGET1)
LLVM_FOO(TARGET2)
// ...
```
Example:
load(":enum_targets_gen.bzl", "enum_targets_gen")
enum_targets_gen(
name = "disassemblers_def_gen",
src = "include/llvm/Config/Disassemblers.def.in",
out = "include/llvm/Config/Disassemblers.def",
macro_name = "DISASSEMBLER",
targets = llvm_target_disassemblers,
)
This rule provides a slightly more semantic API than template_rule, but the main
reason it exists is to permit a list with selects to be passed for `targets` as
a select is not allowed to be passed to a rule within another data structure.
"""
def enum_targets_gen_impl(ctx):
to_replace = "@LLVM_ENUM_{}S@".format(ctx.attr.macro_name)
replacement = "\n".join([
"LLVM_{}({})\n".format(ctx.attr.macro_name, t)
for t in ctx.attr.targets
])
ctx.actions.expand_template(
template = ctx.file.src,
output = ctx.outputs.out,
substitutions = {to_replace: replacement},
)
enum_targets_gen = rule(
attrs = {
"src": attr.label(
mandatory = True,
allow_single_file = True,
),
"out": attr.output(mandatory = True),
"targets": attr.string_list(mandatory = True),
"macro_name": attr.string(
mandatory = True,
doc = "The name of the enumeration. This is the suffix of the" +
" placeholder being replaced `@LLVM_ENUM_{}S@` and of the" +
" macro invocations generated `LLVM_{}(TARGET)`. Should be" +
" all caps and singular, e.g. 'DISASSEMBLER'",
),
},
# output_to_genfiles is required for header files.
output_to_genfiles = True,
implementation = enum_targets_gen_impl,
)
|
