db279c72f2
An HLSL function has internal linkage by default unless it is: 1. shader entry point function 2. marked with the `export` keyword (https://github.com/llvm/llvm-project/issues/92812) 3. patch constant function (not implemented yet) This PR adds a link-time pass `DXILFinalizeLinkage` that updates the linkage of functions to make sure only shader entry points and exported functions are visible from the module (have _program linkage_). All other functions will be updated to have internal linkage. Related spec update: microsoft/hlsl-specs#295 Fixes #llvm/llvm-project#92071
61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
//===- DXILFinalizeLinkage.cpp - Finalize linkage of 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 "DXILFinalizeLinkage.h"
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#include "DirectX.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/Metadata.h"
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#include "llvm/IR/Module.h"
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#define DEBUG_TYPE "dxil-finalize-linkage"
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using namespace llvm;
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static bool finalizeLinkage(Module &M) {
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SmallPtrSet<Function *, 8> EntriesAndExports;
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// Find all entry points and export functions
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for (Function &EF : M.functions()) {
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if (!EF.hasFnAttribute("hlsl.shader") && !EF.hasFnAttribute("hlsl.export"))
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continue;
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EntriesAndExports.insert(&EF);
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}
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for (Function &F : M.functions()) {
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if (F.getLinkage() == GlobalValue::ExternalLinkage &&
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!EntriesAndExports.contains(&F)) {
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F.setLinkage(GlobalValue::InternalLinkage);
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}
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}
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return false;
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}
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PreservedAnalyses DXILFinalizeLinkage::run(Module &M,
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ModuleAnalysisManager &AM) {
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if (finalizeLinkage(M))
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return PreservedAnalyses::none();
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return PreservedAnalyses::all();
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}
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bool DXILFinalizeLinkageLegacy::runOnModule(Module &M) {
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return finalizeLinkage(M);
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}
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char DXILFinalizeLinkageLegacy::ID = 0;
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INITIALIZE_PASS_BEGIN(DXILFinalizeLinkageLegacy, DEBUG_TYPE,
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"DXIL Finalize Linkage", false, false)
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INITIALIZE_PASS_END(DXILFinalizeLinkageLegacy, DEBUG_TYPE,
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"DXIL Finalize Linkage", false, false)
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ModulePass *llvm::createDXILFinalizeLinkageLegacyPass() {
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return new DXILFinalizeLinkageLegacy();
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}
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