64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
//===- AddComdats.cpp - Add comdats to linkonce functions -----------------===//
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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/AddComdats.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_LLVMADDCOMDATS
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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 addComdat(LLVM::LLVMFuncOp &op, OpBuilder &builder,
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SymbolTable &symbolTable, ModuleOp &module) {
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const char *comdatName = "__llvm_comdat";
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mlir::LLVM::ComdatOp comdatOp =
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symbolTable.lookup<mlir::LLVM::ComdatOp>(comdatName);
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if (!comdatOp) {
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PatternRewriter::InsertionGuard guard(builder);
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builder.setInsertionPointToStart(module.getBody());
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comdatOp =
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builder.create<mlir::LLVM::ComdatOp>(module.getLoc(), comdatName);
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symbolTable.insert(comdatOp);
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}
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PatternRewriter::InsertionGuard guard(builder);
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builder.setInsertionPointToStart(&comdatOp.getBody().back());
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auto selectorOp = builder.create<mlir::LLVM::ComdatSelectorOp>(
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comdatOp.getLoc(), op.getSymName(), mlir::LLVM::comdat::Comdat::Any);
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op.setComdatAttr(mlir::SymbolRefAttr::get(
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builder.getContext(), comdatName,
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mlir::FlatSymbolRefAttr::get(selectorOp.getSymNameAttr())));
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}
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namespace {
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struct AddComdatsPass : public LLVM::impl::LLVMAddComdatsBase<AddComdatsPass> {
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void runOnOperation() override {
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OpBuilder builder{&getContext()};
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ModuleOp mod = getOperation();
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std::unique_ptr<SymbolTable> symbolTable;
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auto getSymTab = [&]() -> SymbolTable & {
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if (!symbolTable)
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symbolTable = std::make_unique<SymbolTable>(mod);
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return *symbolTable;
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};
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for (auto op : mod.getBody()->getOps<LLVM::LLVMFuncOp>()) {
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if (op.getLinkage() == LLVM::Linkage::Linkonce ||
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op.getLinkage() == LLVM::Linkage::LinkonceODR) {
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addComdat(op, builder, getSymTab(), mod);
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}
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}
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}
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};
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} // namespace
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