mirror of
https://github.com/RPCSX/llvm.git
synced 2025-01-05 11:18:48 +00:00
8268477130
Summary: ThinLTO is relying on linkInModule to import selected function. However a lot of "magic" was hidden in linkInModule and the IRMover, who would rename and promote global variables on the fly. This is moving to an approach where the steps are decoupled and the client is reponsible to specify the list of globals to import. As a consequence some test are changed because they were relying on the previous behavior which was importing the definition of *every* single global without control on the client side. Now the burden is on the client to decide if a global has to be imported or not. Reviewers: tejohnson Subscribers: joker.eph, llvm-commits Differential Revision: http://reviews.llvm.org/D18122 From: Mehdi Amini <mehdi.amini@apple.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263863 91177308-0d34-0410-b5e6-96231b3b80d8
564 lines
19 KiB
C++
564 lines
19 KiB
C++
//===- lib/Linker/LinkModules.cpp - Module Linker Implementation ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the LLVM module linker.
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//
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//===----------------------------------------------------------------------===//
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#include "LinkDiagnosticInfo.h"
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#include "llvm-c/Linker.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/IR/DiagnosticPrinter.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/Linker/Linker.h"
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#include "llvm/Transforms/Utils/FunctionImportUtils.h"
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using namespace llvm;
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namespace {
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/// This is an implementation class for the LinkModules function, which is the
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/// entrypoint for this file.
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class ModuleLinker {
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IRMover &Mover;
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std::unique_ptr<Module> SrcM;
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SetVector<GlobalValue *> ValuesToLink;
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StringSet<> Internalize;
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/// For symbol clashes, prefer those from Src.
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unsigned Flags;
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/// Functions to import from source module, all other functions are
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/// imported as declarations instead of definitions.
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DenseSet<const GlobalValue *> *GlobalsToImport;
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/// Association between metadata value id and temporary metadata that
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/// remains unmapped after function importing. Saved during function
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/// importing and consumed during the metadata linking postpass.
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DenseMap<unsigned, MDNode *> *ValIDToTempMDMap;
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/// Used as the callback for lazy linking.
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/// The mover has just hit GV and we have to decide if it, and other members
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/// of the same comdat, should be linked. Every member to be linked is passed
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/// to Add.
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void addLazyFor(GlobalValue &GV, IRMover::ValueAdder Add);
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bool shouldOverrideFromSrc() { return Flags & Linker::OverrideFromSrc; }
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bool shouldLinkOnlyNeeded() { return Flags & Linker::LinkOnlyNeeded; }
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bool shouldInternalizeLinkedSymbols() {
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return Flags & Linker::InternalizeLinkedSymbols;
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}
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bool shouldLinkFromSource(bool &LinkFromSrc, const GlobalValue &Dest,
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const GlobalValue &Src);
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/// Should we have mover and linker error diag info?
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bool emitError(const Twine &Message) {
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SrcM->getContext().diagnose(LinkDiagnosticInfo(DS_Error, Message));
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return true;
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}
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bool getComdatLeader(Module &M, StringRef ComdatName,
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const GlobalVariable *&GVar);
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bool computeResultingSelectionKind(StringRef ComdatName,
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Comdat::SelectionKind Src,
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Comdat::SelectionKind Dst,
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Comdat::SelectionKind &Result,
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bool &LinkFromSrc);
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std::map<const Comdat *, std::pair<Comdat::SelectionKind, bool>>
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ComdatsChosen;
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bool getComdatResult(const Comdat *SrcC, Comdat::SelectionKind &SK,
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bool &LinkFromSrc);
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// Keep track of the global value members of each comdat in source.
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DenseMap<const Comdat *, std::vector<GlobalValue *>> ComdatMembers;
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/// Given a global in the source module, return the global in the
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/// destination module that is being linked to, if any.
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GlobalValue *getLinkedToGlobal(const GlobalValue *SrcGV) {
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Module &DstM = Mover.getModule();
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// If the source has no name it can't link. If it has local linkage,
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// there is no name match-up going on.
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if (!SrcGV->hasName() || GlobalValue::isLocalLinkage(SrcGV->getLinkage()))
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return nullptr;
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// Otherwise see if we have a match in the destination module's symtab.
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GlobalValue *DGV = DstM.getNamedValue(SrcGV->getName());
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if (!DGV)
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return nullptr;
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// If we found a global with the same name in the dest module, but it has
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// internal linkage, we are really not doing any linkage here.
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if (DGV->hasLocalLinkage())
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return nullptr;
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// Otherwise, we do in fact link to the destination global.
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return DGV;
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}
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bool linkIfNeeded(GlobalValue &GV);
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/// Helper method to check if we are importing from the current source
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/// module.
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bool isPerformingImport() const { return GlobalsToImport != nullptr; }
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/// If we are importing from the source module, checks if we should
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/// import SGV as a definition, otherwise import as a declaration.
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bool doImportAsDefinition(const GlobalValue *SGV);
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public:
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ModuleLinker(IRMover &Mover, std::unique_ptr<Module> SrcM, unsigned Flags,
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DenseSet<const GlobalValue *> *GlobalsToImport = nullptr,
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DenseMap<unsigned, MDNode *> *ValIDToTempMDMap = nullptr)
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: Mover(Mover), SrcM(std::move(SrcM)), Flags(Flags),
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GlobalsToImport(GlobalsToImport), ValIDToTempMDMap(ValIDToTempMDMap) {}
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bool run();
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};
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}
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bool ModuleLinker::doImportAsDefinition(const GlobalValue *SGV) {
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if (!isPerformingImport())
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return false;
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return FunctionImportGlobalProcessing::doImportAsDefinition(SGV,
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GlobalsToImport);
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}
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static GlobalValue::VisibilityTypes
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getMinVisibility(GlobalValue::VisibilityTypes A,
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GlobalValue::VisibilityTypes B) {
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if (A == GlobalValue::HiddenVisibility || B == GlobalValue::HiddenVisibility)
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return GlobalValue::HiddenVisibility;
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if (A == GlobalValue::ProtectedVisibility ||
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B == GlobalValue::ProtectedVisibility)
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return GlobalValue::ProtectedVisibility;
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return GlobalValue::DefaultVisibility;
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}
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bool ModuleLinker::getComdatLeader(Module &M, StringRef ComdatName,
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const GlobalVariable *&GVar) {
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const GlobalValue *GVal = M.getNamedValue(ComdatName);
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if (const auto *GA = dyn_cast_or_null<GlobalAlias>(GVal)) {
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GVal = GA->getBaseObject();
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if (!GVal)
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// We cannot resolve the size of the aliasee yet.
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return emitError("Linking COMDATs named '" + ComdatName +
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"': COMDAT key involves incomputable alias size.");
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}
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GVar = dyn_cast_or_null<GlobalVariable>(GVal);
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if (!GVar)
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return emitError(
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"Linking COMDATs named '" + ComdatName +
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"': GlobalVariable required for data dependent selection!");
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return false;
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}
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bool ModuleLinker::computeResultingSelectionKind(StringRef ComdatName,
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Comdat::SelectionKind Src,
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Comdat::SelectionKind Dst,
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Comdat::SelectionKind &Result,
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bool &LinkFromSrc) {
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Module &DstM = Mover.getModule();
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// The ability to mix Comdat::SelectionKind::Any with
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// Comdat::SelectionKind::Largest is a behavior that comes from COFF.
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bool DstAnyOrLargest = Dst == Comdat::SelectionKind::Any ||
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Dst == Comdat::SelectionKind::Largest;
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bool SrcAnyOrLargest = Src == Comdat::SelectionKind::Any ||
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Src == Comdat::SelectionKind::Largest;
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if (DstAnyOrLargest && SrcAnyOrLargest) {
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if (Dst == Comdat::SelectionKind::Largest ||
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Src == Comdat::SelectionKind::Largest)
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Result = Comdat::SelectionKind::Largest;
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else
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Result = Comdat::SelectionKind::Any;
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} else if (Src == Dst) {
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Result = Dst;
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} else {
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return emitError("Linking COMDATs named '" + ComdatName +
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"': invalid selection kinds!");
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}
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switch (Result) {
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case Comdat::SelectionKind::Any:
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// Go with Dst.
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LinkFromSrc = false;
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break;
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case Comdat::SelectionKind::NoDuplicates:
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return emitError("Linking COMDATs named '" + ComdatName +
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"': noduplicates has been violated!");
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case Comdat::SelectionKind::ExactMatch:
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case Comdat::SelectionKind::Largest:
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case Comdat::SelectionKind::SameSize: {
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const GlobalVariable *DstGV;
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const GlobalVariable *SrcGV;
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if (getComdatLeader(DstM, ComdatName, DstGV) ||
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getComdatLeader(*SrcM, ComdatName, SrcGV))
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return true;
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const DataLayout &DstDL = DstM.getDataLayout();
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const DataLayout &SrcDL = SrcM->getDataLayout();
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uint64_t DstSize = DstDL.getTypeAllocSize(DstGV->getValueType());
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uint64_t SrcSize = SrcDL.getTypeAllocSize(SrcGV->getValueType());
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if (Result == Comdat::SelectionKind::ExactMatch) {
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if (SrcGV->getInitializer() != DstGV->getInitializer())
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return emitError("Linking COMDATs named '" + ComdatName +
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"': ExactMatch violated!");
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LinkFromSrc = false;
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} else if (Result == Comdat::SelectionKind::Largest) {
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LinkFromSrc = SrcSize > DstSize;
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} else if (Result == Comdat::SelectionKind::SameSize) {
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if (SrcSize != DstSize)
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return emitError("Linking COMDATs named '" + ComdatName +
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"': SameSize violated!");
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LinkFromSrc = false;
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} else {
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llvm_unreachable("unknown selection kind");
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}
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break;
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}
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}
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return false;
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}
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bool ModuleLinker::getComdatResult(const Comdat *SrcC,
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Comdat::SelectionKind &Result,
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bool &LinkFromSrc) {
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Module &DstM = Mover.getModule();
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Comdat::SelectionKind SSK = SrcC->getSelectionKind();
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StringRef ComdatName = SrcC->getName();
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Module::ComdatSymTabType &ComdatSymTab = DstM.getComdatSymbolTable();
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Module::ComdatSymTabType::iterator DstCI = ComdatSymTab.find(ComdatName);
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if (DstCI == ComdatSymTab.end()) {
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// Use the comdat if it is only available in one of the modules.
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LinkFromSrc = true;
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Result = SSK;
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return false;
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}
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const Comdat *DstC = &DstCI->second;
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Comdat::SelectionKind DSK = DstC->getSelectionKind();
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return computeResultingSelectionKind(ComdatName, SSK, DSK, Result,
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LinkFromSrc);
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}
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bool ModuleLinker::shouldLinkFromSource(bool &LinkFromSrc,
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const GlobalValue &Dest,
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const GlobalValue &Src) {
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// Should we unconditionally use the Src?
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if (shouldOverrideFromSrc()) {
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LinkFromSrc = true;
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return false;
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}
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// We always have to add Src if it has appending linkage.
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if (Src.hasAppendingLinkage()) {
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// Should have prevented importing for appending linkage in linkIfNeeded.
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assert(!isPerformingImport());
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LinkFromSrc = true;
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return false;
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}
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bool SrcIsDeclaration = Src.isDeclarationForLinker();
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bool DestIsDeclaration = Dest.isDeclarationForLinker();
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if (isPerformingImport()) {
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if (isa<Function>(&Src)) {
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// For functions, LinkFromSrc iff this is a function requested
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// for importing. For variables, decide below normally.
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LinkFromSrc = GlobalsToImport->count(&Src);
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return false;
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}
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// Check if this is an alias with an already existing definition
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// in Dest, which must have come from a prior importing pass from
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// the same Src module. Unlike imported function and variable
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// definitions, which are imported as available_externally and are
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// not definitions for the linker, that is not a valid linkage for
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// imported aliases which must be definitions. Simply use the existing
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// Dest copy.
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if (isa<GlobalAlias>(&Src) && !DestIsDeclaration) {
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assert(isa<GlobalAlias>(&Dest));
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LinkFromSrc = false;
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return false;
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}
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}
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if (SrcIsDeclaration) {
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// If Src is external or if both Src & Dest are external.. Just link the
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// external globals, we aren't adding anything.
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if (Src.hasDLLImportStorageClass()) {
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// If one of GVs is marked as DLLImport, result should be dllimport'ed.
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LinkFromSrc = DestIsDeclaration;
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return false;
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}
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// If the Dest is weak, use the source linkage.
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if (Dest.hasExternalWeakLinkage()) {
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LinkFromSrc = true;
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return false;
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}
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// Link an available_externally over a declaration.
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LinkFromSrc = !Src.isDeclaration() && Dest.isDeclaration();
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return false;
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}
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if (DestIsDeclaration) {
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// If Dest is external but Src is not:
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LinkFromSrc = true;
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return false;
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}
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if (Src.hasCommonLinkage()) {
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if (Dest.hasLinkOnceLinkage() || Dest.hasWeakLinkage()) {
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LinkFromSrc = true;
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return false;
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}
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if (!Dest.hasCommonLinkage()) {
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LinkFromSrc = false;
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return false;
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}
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const DataLayout &DL = Dest.getParent()->getDataLayout();
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uint64_t DestSize = DL.getTypeAllocSize(Dest.getValueType());
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uint64_t SrcSize = DL.getTypeAllocSize(Src.getValueType());
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LinkFromSrc = SrcSize > DestSize;
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return false;
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}
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if (Src.isWeakForLinker()) {
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assert(!Dest.hasExternalWeakLinkage());
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assert(!Dest.hasAvailableExternallyLinkage());
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if (Dest.hasLinkOnceLinkage() && Src.hasWeakLinkage()) {
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LinkFromSrc = true;
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return false;
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}
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LinkFromSrc = false;
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return false;
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}
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if (Dest.isWeakForLinker()) {
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assert(Src.hasExternalLinkage());
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LinkFromSrc = true;
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return false;
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}
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assert(!Src.hasExternalWeakLinkage());
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assert(!Dest.hasExternalWeakLinkage());
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assert(Dest.hasExternalLinkage() && Src.hasExternalLinkage() &&
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"Unexpected linkage type!");
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return emitError("Linking globals named '" + Src.getName() +
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"': symbol multiply defined!");
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}
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bool ModuleLinker::linkIfNeeded(GlobalValue &GV) {
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GlobalValue *DGV = getLinkedToGlobal(&GV);
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if (shouldLinkOnlyNeeded() && !(DGV && DGV->isDeclaration()))
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return false;
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if (DGV && !GV.hasLocalLinkage() && !GV.hasAppendingLinkage()) {
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auto *DGVar = dyn_cast<GlobalVariable>(DGV);
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auto *SGVar = dyn_cast<GlobalVariable>(&GV);
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if (DGVar && SGVar) {
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if (DGVar->isDeclaration() && SGVar->isDeclaration() &&
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(!DGVar->isConstant() || !SGVar->isConstant())) {
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DGVar->setConstant(false);
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SGVar->setConstant(false);
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}
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if (DGVar->hasCommonLinkage() && SGVar->hasCommonLinkage()) {
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unsigned Align = std::max(DGVar->getAlignment(), SGVar->getAlignment());
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SGVar->setAlignment(Align);
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DGVar->setAlignment(Align);
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}
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}
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GlobalValue::VisibilityTypes Visibility =
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getMinVisibility(DGV->getVisibility(), GV.getVisibility());
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DGV->setVisibility(Visibility);
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GV.setVisibility(Visibility);
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bool HasUnnamedAddr = GV.hasUnnamedAddr() && DGV->hasUnnamedAddr();
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DGV->setUnnamedAddr(HasUnnamedAddr);
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GV.setUnnamedAddr(HasUnnamedAddr);
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}
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// Don't want to append to global_ctors list, for example, when we
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// are importing for ThinLTO, otherwise the global ctors and dtors
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// get executed multiple times for local variables (the latter causing
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// double frees).
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if (GV.hasAppendingLinkage() && isPerformingImport())
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return false;
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if (isPerformingImport()) {
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if (!doImportAsDefinition(&GV))
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return false;
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} else if (!DGV && !shouldOverrideFromSrc() &&
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(GV.hasLocalLinkage() || GV.hasLinkOnceLinkage() ||
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GV.hasAvailableExternallyLinkage()))
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return false;
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if (GV.isDeclaration())
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return false;
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if (const Comdat *SC = GV.getComdat()) {
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bool LinkFromSrc;
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Comdat::SelectionKind SK;
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std::tie(SK, LinkFromSrc) = ComdatsChosen[SC];
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if (LinkFromSrc)
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ValuesToLink.insert(&GV);
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return false;
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}
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bool LinkFromSrc = true;
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if (DGV && shouldLinkFromSource(LinkFromSrc, *DGV, GV))
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return true;
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if (LinkFromSrc)
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ValuesToLink.insert(&GV);
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return false;
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}
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void ModuleLinker::addLazyFor(GlobalValue &GV, IRMover::ValueAdder Add) {
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// Add these to the internalize list
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if (!GV.hasLinkOnceLinkage())
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return;
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if (shouldInternalizeLinkedSymbols())
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Internalize.insert(GV.getName());
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Add(GV);
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const Comdat *SC = GV.getComdat();
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if (!SC)
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return;
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for (GlobalValue *GV2 : ComdatMembers[SC]) {
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if (!GV2->hasLocalLinkage() && shouldInternalizeLinkedSymbols())
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Internalize.insert(GV2->getName());
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Add(*GV2);
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}
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}
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bool ModuleLinker::run() {
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for (const auto &SMEC : SrcM->getComdatSymbolTable()) {
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const Comdat &C = SMEC.getValue();
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if (ComdatsChosen.count(&C))
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continue;
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Comdat::SelectionKind SK;
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bool LinkFromSrc;
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if (getComdatResult(&C, SK, LinkFromSrc))
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return true;
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ComdatsChosen[&C] = std::make_pair(SK, LinkFromSrc);
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}
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for (GlobalVariable &GV : SrcM->globals())
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if (const Comdat *SC = GV.getComdat())
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ComdatMembers[SC].push_back(&GV);
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for (Function &SF : *SrcM)
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if (const Comdat *SC = SF.getComdat())
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ComdatMembers[SC].push_back(&SF);
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for (GlobalAlias &GA : SrcM->aliases())
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if (const Comdat *SC = GA.getComdat())
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ComdatMembers[SC].push_back(&GA);
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// Insert all of the globals in src into the DstM module... without linking
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// initializers (which could refer to functions not yet mapped over).
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for (GlobalVariable &GV : SrcM->globals())
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if (linkIfNeeded(GV))
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return true;
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for (Function &SF : *SrcM)
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if (linkIfNeeded(SF))
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return true;
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for (GlobalAlias &GA : SrcM->aliases())
|
|
if (linkIfNeeded(GA))
|
|
return true;
|
|
|
|
for (unsigned I = 0; I < ValuesToLink.size(); ++I) {
|
|
GlobalValue *GV = ValuesToLink[I];
|
|
const Comdat *SC = GV->getComdat();
|
|
if (!SC)
|
|
continue;
|
|
for (GlobalValue *GV2 : ComdatMembers[SC])
|
|
ValuesToLink.insert(GV2);
|
|
}
|
|
|
|
if (shouldInternalizeLinkedSymbols()) {
|
|
for (GlobalValue *GV : ValuesToLink)
|
|
Internalize.insert(GV->getName());
|
|
}
|
|
|
|
if (Mover.move(std::move(SrcM), ValuesToLink.getArrayRef(),
|
|
[this](GlobalValue &GV, IRMover::ValueAdder Add) {
|
|
addLazyFor(GV, Add);
|
|
},
|
|
ValIDToTempMDMap, false))
|
|
return true;
|
|
Module &DstM = Mover.getModule();
|
|
for (auto &P : Internalize) {
|
|
GlobalValue *GV = DstM.getNamedValue(P.first());
|
|
GV->setLinkage(GlobalValue::InternalLinkage);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
Linker::Linker(Module &M) : Mover(M) {}
|
|
|
|
bool Linker::linkInModule(std::unique_ptr<Module> Src, unsigned Flags,
|
|
DenseSet<const GlobalValue *> *GlobalsToImport,
|
|
DenseMap<unsigned, MDNode *> *ValIDToTempMDMap) {
|
|
ModuleLinker ModLinker(Mover, std::move(Src), Flags, GlobalsToImport,
|
|
ValIDToTempMDMap);
|
|
return ModLinker.run();
|
|
}
|
|
|
|
bool Linker::linkInMetadata(std::unique_ptr<Module> Src,
|
|
DenseMap<unsigned, MDNode *> *ValIDToTempMDMap) {
|
|
SetVector<GlobalValue *> ValuesToLink;
|
|
if (Mover.move(
|
|
std::move(Src), ValuesToLink.getArrayRef(),
|
|
[this](GlobalValue &GV, IRMover::ValueAdder Add) { assert(false); },
|
|
ValIDToTempMDMap, true))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// LinkModules entrypoint.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// This function links two modules together, with the resulting Dest module
|
|
/// modified to be the composite of the two input modules. If an error occurs,
|
|
/// true is returned and ErrorMsg (if not null) is set to indicate the problem.
|
|
/// Upon failure, the Dest module could be in a modified state, and shouldn't be
|
|
/// relied on to be consistent.
|
|
bool Linker::linkModules(Module &Dest, std::unique_ptr<Module> Src,
|
|
unsigned Flags) {
|
|
Linker L(Dest);
|
|
return L.linkInModule(std::move(Src), Flags);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// C API.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
LLVMBool LLVMLinkModules2(LLVMModuleRef Dest, LLVMModuleRef Src) {
|
|
Module *D = unwrap(Dest);
|
|
std::unique_ptr<Module> M(unwrap(Src));
|
|
return Linker::linkModules(*D, std::move(M));
|
|
}
|