568ce76c6e
To support the `-fvisibility=...` option in Flang, we need a pass to rewrite all the global definitions in the LLVM dialect that have the default visibility to have the specified visibility. This change adds such a pass. Note that I did not add an option for `visiblity=default`; I believe this makes sense for compiler drivers since users may want to tack an option on at the end of a compile line to override earlier options, but I don't think it makes sense for this pass to accept `visibility=default`--it would just be an early exit IIUC.
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
//===- UseDefaultVisibilityPass.cpp - Update default visibility -----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Dialect/LLVMIR/Transforms/UseDefaultVisibilityPass.h"
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#include "mlir/Dialect/LLVMIR/LLVMAttrs.h"
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#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
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#include "mlir/Pass/Pass.h"
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namespace mlir {
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namespace LLVM {
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#define GEN_PASS_DEF_LLVMUSEDEFAULTVISIBILITYPASS
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#include "mlir/Dialect/LLVMIR/Transforms/Passes.h.inc"
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} // namespace LLVM
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} // namespace mlir
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using namespace mlir;
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static void updateVisibility(Operation *op,
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LLVM::VisibilityAttr newVisibilityAttr) {
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if (auto visibilityAttr =
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op->getAttrOfType<LLVM::VisibilityAttr>(LLVM::VisibilityAttr::name)) {
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LLVM::Visibility visibility = visibilityAttr.getValue();
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if (visibility == LLVM::Visibility::Default) {
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op->setAttr(LLVM::VisibilityAttr::name, newVisibilityAttr);
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}
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}
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}
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namespace {
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class UseDefaultVisibilityPass
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: public LLVM::impl::LLVMUseDefaultVisibilityPassBase<
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UseDefaultVisibilityPass> {
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using Base::Base;
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public:
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void runOnOperation() override {
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LLVM::Visibility useDefaultVisibility = useVisibility.getValue();
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Operation *op = getOperation();
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MLIRContext *context = op->getContext();
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Dialect *llvmDialect = context->getLoadedDialect<LLVM::LLVMDialect>();
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auto newVisibilityAttr =
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LLVM::VisibilityAttr::get(context, useDefaultVisibility);
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op->walk([&](Operation *op) {
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if (op->getDialect() == llvmDialect)
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updateVisibility(op, newVisibilityAttr);
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});
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}
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};
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} // namespace
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