mirror of
https://github.com/c64scene-ar/llvm-6502.git
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We were setting the comdat when functions were copied in the initial pass, but not when they were linked only when we found out that they are needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215765 91177308-0d34-0410-b5e6-96231b3b80d8
1716 lines
63 KiB
C++
1716 lines
63 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 "llvm/Linker/Linker.h"
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#include "llvm-c/Linker.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/TypeFinder.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Transforms/Utils/Cloning.h"
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#include <cctype>
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#include <tuple>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// TypeMap implementation.
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//===----------------------------------------------------------------------===//
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namespace {
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typedef SmallPtrSet<StructType*, 32> TypeSet;
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class TypeMapTy : public ValueMapTypeRemapper {
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/// MappedTypes - This is a mapping from a source type to a destination type
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/// to use.
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DenseMap<Type*, Type*> MappedTypes;
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/// SpeculativeTypes - When checking to see if two subgraphs are isomorphic,
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/// we speculatively add types to MappedTypes, but keep track of them here in
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/// case we need to roll back.
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SmallVector<Type*, 16> SpeculativeTypes;
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/// SrcDefinitionsToResolve - This is a list of non-opaque structs in the
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/// source module that are mapped to an opaque struct in the destination
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/// module.
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SmallVector<StructType*, 16> SrcDefinitionsToResolve;
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/// DstResolvedOpaqueTypes - This is the set of opaque types in the
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/// destination modules who are getting a body from the source module.
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SmallPtrSet<StructType*, 16> DstResolvedOpaqueTypes;
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public:
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TypeMapTy(TypeSet &Set) : DstStructTypesSet(Set) {}
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TypeSet &DstStructTypesSet;
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/// addTypeMapping - Indicate that the specified type in the destination
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/// module is conceptually equivalent to the specified type in the source
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/// module.
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void addTypeMapping(Type *DstTy, Type *SrcTy);
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/// linkDefinedTypeBodies - Produce a body for an opaque type in the dest
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/// module from a type definition in the source module.
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void linkDefinedTypeBodies();
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/// get - Return the mapped type to use for the specified input type from the
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/// source module.
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Type *get(Type *SrcTy);
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FunctionType *get(FunctionType *T) {return cast<FunctionType>(get((Type*)T));}
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/// dump - Dump out the type map for debugging purposes.
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void dump() const {
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for (DenseMap<Type*, Type*>::const_iterator
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I = MappedTypes.begin(), E = MappedTypes.end(); I != E; ++I) {
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dbgs() << "TypeMap: ";
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I->first->print(dbgs());
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dbgs() << " => ";
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I->second->print(dbgs());
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dbgs() << '\n';
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}
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}
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private:
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Type *getImpl(Type *T);
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/// remapType - Implement the ValueMapTypeRemapper interface.
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Type *remapType(Type *SrcTy) override {
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return get(SrcTy);
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}
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bool areTypesIsomorphic(Type *DstTy, Type *SrcTy);
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};
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}
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void TypeMapTy::addTypeMapping(Type *DstTy, Type *SrcTy) {
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Type *&Entry = MappedTypes[SrcTy];
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if (Entry) return;
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if (DstTy == SrcTy) {
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Entry = DstTy;
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return;
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}
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// Check to see if these types are recursively isomorphic and establish a
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// mapping between them if so.
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if (!areTypesIsomorphic(DstTy, SrcTy)) {
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// Oops, they aren't isomorphic. Just discard this request by rolling out
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// any speculative mappings we've established.
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for (unsigned i = 0, e = SpeculativeTypes.size(); i != e; ++i)
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MappedTypes.erase(SpeculativeTypes[i]);
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}
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SpeculativeTypes.clear();
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}
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/// areTypesIsomorphic - Recursively walk this pair of types, returning true
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/// if they are isomorphic, false if they are not.
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bool TypeMapTy::areTypesIsomorphic(Type *DstTy, Type *SrcTy) {
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// Two types with differing kinds are clearly not isomorphic.
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if (DstTy->getTypeID() != SrcTy->getTypeID()) return false;
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// If we have an entry in the MappedTypes table, then we have our answer.
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Type *&Entry = MappedTypes[SrcTy];
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if (Entry)
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return Entry == DstTy;
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// Two identical types are clearly isomorphic. Remember this
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// non-speculatively.
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if (DstTy == SrcTy) {
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Entry = DstTy;
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return true;
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}
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// Okay, we have two types with identical kinds that we haven't seen before.
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// If this is an opaque struct type, special case it.
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if (StructType *SSTy = dyn_cast<StructType>(SrcTy)) {
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// Mapping an opaque type to any struct, just keep the dest struct.
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if (SSTy->isOpaque()) {
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Entry = DstTy;
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SpeculativeTypes.push_back(SrcTy);
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return true;
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}
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// Mapping a non-opaque source type to an opaque dest. If this is the first
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// type that we're mapping onto this destination type then we succeed. Keep
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// the dest, but fill it in later. This doesn't need to be speculative. If
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// this is the second (different) type that we're trying to map onto the
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// same opaque type then we fail.
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if (cast<StructType>(DstTy)->isOpaque()) {
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// We can only map one source type onto the opaque destination type.
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if (!DstResolvedOpaqueTypes.insert(cast<StructType>(DstTy)))
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return false;
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SrcDefinitionsToResolve.push_back(SSTy);
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Entry = DstTy;
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return true;
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}
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}
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// If the number of subtypes disagree between the two types, then we fail.
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if (SrcTy->getNumContainedTypes() != DstTy->getNumContainedTypes())
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return false;
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// Fail if any of the extra properties (e.g. array size) of the type disagree.
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if (isa<IntegerType>(DstTy))
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return false; // bitwidth disagrees.
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if (PointerType *PT = dyn_cast<PointerType>(DstTy)) {
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if (PT->getAddressSpace() != cast<PointerType>(SrcTy)->getAddressSpace())
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return false;
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} else if (FunctionType *FT = dyn_cast<FunctionType>(DstTy)) {
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if (FT->isVarArg() != cast<FunctionType>(SrcTy)->isVarArg())
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return false;
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} else if (StructType *DSTy = dyn_cast<StructType>(DstTy)) {
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StructType *SSTy = cast<StructType>(SrcTy);
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if (DSTy->isLiteral() != SSTy->isLiteral() ||
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DSTy->isPacked() != SSTy->isPacked())
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return false;
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} else if (ArrayType *DATy = dyn_cast<ArrayType>(DstTy)) {
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if (DATy->getNumElements() != cast<ArrayType>(SrcTy)->getNumElements())
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return false;
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} else if (VectorType *DVTy = dyn_cast<VectorType>(DstTy)) {
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if (DVTy->getNumElements() != cast<VectorType>(SrcTy)->getNumElements())
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return false;
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}
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// Otherwise, we speculate that these two types will line up and recursively
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// check the subelements.
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Entry = DstTy;
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SpeculativeTypes.push_back(SrcTy);
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for (unsigned i = 0, e = SrcTy->getNumContainedTypes(); i != e; ++i)
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if (!areTypesIsomorphic(DstTy->getContainedType(i),
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SrcTy->getContainedType(i)))
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return false;
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// If everything seems to have lined up, then everything is great.
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return true;
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}
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/// linkDefinedTypeBodies - Produce a body for an opaque type in the dest
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/// module from a type definition in the source module.
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void TypeMapTy::linkDefinedTypeBodies() {
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SmallVector<Type*, 16> Elements;
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SmallString<16> TmpName;
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// Note that processing entries in this loop (calling 'get') can add new
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// entries to the SrcDefinitionsToResolve vector.
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while (!SrcDefinitionsToResolve.empty()) {
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StructType *SrcSTy = SrcDefinitionsToResolve.pop_back_val();
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StructType *DstSTy = cast<StructType>(MappedTypes[SrcSTy]);
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// TypeMap is a many-to-one mapping, if there were multiple types that
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// provide a body for DstSTy then previous iterations of this loop may have
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// already handled it. Just ignore this case.
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if (!DstSTy->isOpaque()) continue;
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assert(!SrcSTy->isOpaque() && "Not resolving a definition?");
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// Map the body of the source type over to a new body for the dest type.
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Elements.resize(SrcSTy->getNumElements());
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for (unsigned i = 0, e = Elements.size(); i != e; ++i)
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Elements[i] = getImpl(SrcSTy->getElementType(i));
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DstSTy->setBody(Elements, SrcSTy->isPacked());
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// If DstSTy has no name or has a longer name than STy, then viciously steal
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// STy's name.
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if (!SrcSTy->hasName()) continue;
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StringRef SrcName = SrcSTy->getName();
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if (!DstSTy->hasName() || DstSTy->getName().size() > SrcName.size()) {
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TmpName.insert(TmpName.end(), SrcName.begin(), SrcName.end());
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SrcSTy->setName("");
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DstSTy->setName(TmpName.str());
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TmpName.clear();
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}
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}
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DstResolvedOpaqueTypes.clear();
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}
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/// get - Return the mapped type to use for the specified input type from the
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/// source module.
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Type *TypeMapTy::get(Type *Ty) {
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Type *Result = getImpl(Ty);
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// If this caused a reference to any struct type, resolve it before returning.
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if (!SrcDefinitionsToResolve.empty())
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linkDefinedTypeBodies();
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return Result;
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}
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/// getImpl - This is the recursive version of get().
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Type *TypeMapTy::getImpl(Type *Ty) {
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// If we already have an entry for this type, return it.
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Type **Entry = &MappedTypes[Ty];
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if (*Entry) return *Entry;
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// If this is not a named struct type, then just map all of the elements and
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// then rebuild the type from inside out.
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if (!isa<StructType>(Ty) || cast<StructType>(Ty)->isLiteral()) {
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// If there are no element types to map, then the type is itself. This is
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// true for the anonymous {} struct, things like 'float', integers, etc.
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if (Ty->getNumContainedTypes() == 0)
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return *Entry = Ty;
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// Remap all of the elements, keeping track of whether any of them change.
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bool AnyChange = false;
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SmallVector<Type*, 4> ElementTypes;
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ElementTypes.resize(Ty->getNumContainedTypes());
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for (unsigned i = 0, e = Ty->getNumContainedTypes(); i != e; ++i) {
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ElementTypes[i] = getImpl(Ty->getContainedType(i));
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AnyChange |= ElementTypes[i] != Ty->getContainedType(i);
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}
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// If we found our type while recursively processing stuff, just use it.
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Entry = &MappedTypes[Ty];
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if (*Entry) return *Entry;
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// If all of the element types mapped directly over, then the type is usable
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// as-is.
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if (!AnyChange)
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return *Entry = Ty;
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// Otherwise, rebuild a modified type.
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switch (Ty->getTypeID()) {
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default: llvm_unreachable("unknown derived type to remap");
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case Type::ArrayTyID:
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return *Entry = ArrayType::get(ElementTypes[0],
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cast<ArrayType>(Ty)->getNumElements());
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case Type::VectorTyID:
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return *Entry = VectorType::get(ElementTypes[0],
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cast<VectorType>(Ty)->getNumElements());
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case Type::PointerTyID:
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return *Entry = PointerType::get(ElementTypes[0],
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cast<PointerType>(Ty)->getAddressSpace());
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case Type::FunctionTyID:
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return *Entry = FunctionType::get(ElementTypes[0],
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makeArrayRef(ElementTypes).slice(1),
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cast<FunctionType>(Ty)->isVarArg());
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case Type::StructTyID:
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// Note that this is only reached for anonymous structs.
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return *Entry = StructType::get(Ty->getContext(), ElementTypes,
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cast<StructType>(Ty)->isPacked());
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}
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}
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// Otherwise, this is an unmapped named struct. If the struct can be directly
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// mapped over, just use it as-is. This happens in a case when the linked-in
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// module has something like:
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// %T = type {%T*, i32}
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// @GV = global %T* null
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// where T does not exist at all in the destination module.
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//
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// The other case we watch for is when the type is not in the destination
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// module, but that it has to be rebuilt because it refers to something that
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// is already mapped. For example, if the destination module has:
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// %A = type { i32 }
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// and the source module has something like
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// %A' = type { i32 }
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// %B = type { %A'* }
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// @GV = global %B* null
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// then we want to create a new type: "%B = type { %A*}" and have it take the
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// pristine "%B" name from the source module.
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//
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// To determine which case this is, we have to recursively walk the type graph
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// speculating that we'll be able to reuse it unmodified. Only if this is
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// safe would we map the entire thing over. Because this is an optimization,
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// and is not required for the prettiness of the linked module, we just skip
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// it and always rebuild a type here.
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StructType *STy = cast<StructType>(Ty);
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// If the type is opaque, we can just use it directly.
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if (STy->isOpaque()) {
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// A named structure type from src module is used. Add it to the Set of
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// identified structs in the destination module.
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DstStructTypesSet.insert(STy);
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return *Entry = STy;
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}
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// Otherwise we create a new type and resolve its body later. This will be
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// resolved by the top level of get().
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SrcDefinitionsToResolve.push_back(STy);
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StructType *DTy = StructType::create(STy->getContext());
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// A new identified structure type was created. Add it to the set of
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// identified structs in the destination module.
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DstStructTypesSet.insert(DTy);
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DstResolvedOpaqueTypes.insert(DTy);
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return *Entry = DTy;
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}
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//===----------------------------------------------------------------------===//
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// ModuleLinker implementation.
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//===----------------------------------------------------------------------===//
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namespace {
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class ModuleLinker;
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/// ValueMaterializerTy - Creates prototypes for functions that are lazily
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/// linked on the fly. This speeds up linking for modules with many
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/// lazily linked functions of which few get used.
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class ValueMaterializerTy : public ValueMaterializer {
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TypeMapTy &TypeMap;
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Module *DstM;
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std::vector<Function*> &LazilyLinkFunctions;
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public:
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ValueMaterializerTy(TypeMapTy &TypeMap, Module *DstM,
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std::vector<Function*> &LazilyLinkFunctions) :
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ValueMaterializer(), TypeMap(TypeMap), DstM(DstM),
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LazilyLinkFunctions(LazilyLinkFunctions) {
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}
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Value *materializeValueFor(Value *V) override;
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};
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/// ModuleLinker - This is an implementation class for the LinkModules
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/// function, which is the entrypoint for this file.
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class ModuleLinker {
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Module *DstM, *SrcM;
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TypeMapTy TypeMap;
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ValueMaterializerTy ValMaterializer;
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/// ValueMap - Mapping of values from what they used to be in Src, to what
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/// they are now in DstM. ValueToValueMapTy is a ValueMap, which involves
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/// some overhead due to the use of Value handles which the Linker doesn't
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/// actually need, but this allows us to reuse the ValueMapper code.
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ValueToValueMapTy ValueMap;
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struct AppendingVarInfo {
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GlobalVariable *NewGV; // New aggregate global in dest module.
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Constant *DstInit; // Old initializer from dest module.
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Constant *SrcInit; // Old initializer from src module.
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};
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std::vector<AppendingVarInfo> AppendingVars;
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unsigned Mode; // Mode to treat source module.
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// Set of items not to link in from source.
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SmallPtrSet<const Value*, 16> DoNotLinkFromSource;
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// Vector of functions to lazily link in.
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std::vector<Function*> LazilyLinkFunctions;
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bool SuppressWarnings;
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public:
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std::string ErrorMsg;
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ModuleLinker(Module *dstM, TypeSet &Set, Module *srcM, unsigned mode,
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bool SuppressWarnings=false)
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: DstM(dstM), SrcM(srcM), TypeMap(Set),
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ValMaterializer(TypeMap, DstM, LazilyLinkFunctions), Mode(mode),
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SuppressWarnings(SuppressWarnings) {}
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bool run();
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private:
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/// emitError - Helper method for setting a message and returning an error
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/// code.
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bool emitError(const Twine &Message) {
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ErrorMsg = Message.str();
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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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/// getLinkageResult - This analyzes the two global values and determines
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/// what the result will look like in the destination module.
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bool getLinkageResult(GlobalValue *Dest, const GlobalValue *Src,
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GlobalValue::LinkageTypes <,
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GlobalValue::VisibilityTypes &Vis,
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bool &LinkFromSrc);
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/// getLinkedToGlobal - Given a global in the source module, return the
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/// global in the destination module that is being linked to, if any.
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GlobalValue *getLinkedToGlobal(GlobalValue *SrcGV) {
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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() || SrcGV->hasLocalLinkage())
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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) 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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void computeTypeMapping();
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void upgradeMismatchedGlobalArray(StringRef Name);
|
|
void upgradeMismatchedGlobals();
|
|
|
|
bool linkAppendingVarProto(GlobalVariable *DstGV, GlobalVariable *SrcGV);
|
|
bool linkGlobalProto(GlobalVariable *SrcGV);
|
|
bool linkFunctionProto(Function *SrcF);
|
|
bool linkAliasProto(GlobalAlias *SrcA);
|
|
bool linkModuleFlagsMetadata();
|
|
|
|
void linkAppendingVarInit(const AppendingVarInfo &AVI);
|
|
void linkGlobalInits();
|
|
void linkFunctionBody(Function *Dst, Function *Src);
|
|
void linkAliasBodies();
|
|
void linkNamedMDNodes();
|
|
};
|
|
}
|
|
|
|
/// forceRenaming - The LLVM SymbolTable class autorenames globals that conflict
|
|
/// in the symbol table. This is good for all clients except for us. Go
|
|
/// through the trouble to force this back.
|
|
static void forceRenaming(GlobalValue *GV, StringRef Name) {
|
|
// If the global doesn't force its name or if it already has the right name,
|
|
// there is nothing for us to do.
|
|
if (GV->hasLocalLinkage() || GV->getName() == Name)
|
|
return;
|
|
|
|
Module *M = GV->getParent();
|
|
|
|
// If there is a conflict, rename the conflict.
|
|
if (GlobalValue *ConflictGV = M->getNamedValue(Name)) {
|
|
GV->takeName(ConflictGV);
|
|
ConflictGV->setName(Name); // This will cause ConflictGV to get renamed
|
|
assert(ConflictGV->getName() != Name && "forceRenaming didn't work");
|
|
} else {
|
|
GV->setName(Name); // Force the name back
|
|
}
|
|
}
|
|
|
|
/// copyGVAttributes - copy additional attributes (those not needed to construct
|
|
/// a GlobalValue) from the SrcGV to the DestGV.
|
|
static void copyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) {
|
|
// Use the maximum alignment, rather than just copying the alignment of SrcGV.
|
|
auto *DestGO = dyn_cast<GlobalObject>(DestGV);
|
|
unsigned Alignment;
|
|
if (DestGO)
|
|
Alignment = std::max(DestGO->getAlignment(), SrcGV->getAlignment());
|
|
|
|
DestGV->copyAttributesFrom(SrcGV);
|
|
|
|
if (DestGO)
|
|
DestGO->setAlignment(Alignment);
|
|
|
|
forceRenaming(DestGV, SrcGV->getName());
|
|
}
|
|
|
|
static bool isLessConstraining(GlobalValue::VisibilityTypes a,
|
|
GlobalValue::VisibilityTypes b) {
|
|
if (a == GlobalValue::HiddenVisibility)
|
|
return false;
|
|
if (b == GlobalValue::HiddenVisibility)
|
|
return true;
|
|
if (a == GlobalValue::ProtectedVisibility)
|
|
return false;
|
|
if (b == GlobalValue::ProtectedVisibility)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
Value *ValueMaterializerTy::materializeValueFor(Value *V) {
|
|
Function *SF = dyn_cast<Function>(V);
|
|
if (!SF)
|
|
return nullptr;
|
|
|
|
Function *DF = Function::Create(TypeMap.get(SF->getFunctionType()),
|
|
SF->getLinkage(), SF->getName(), DstM);
|
|
copyGVAttributes(DF, SF);
|
|
|
|
if (Comdat *SC = SF->getComdat()) {
|
|
Comdat *DC = DstM->getOrInsertComdat(SC->getName());
|
|
DF->setComdat(DC);
|
|
}
|
|
|
|
LazilyLinkFunctions.push_back(SF);
|
|
return DF;
|
|
}
|
|
|
|
bool ModuleLinker::getComdatLeader(Module *M, StringRef ComdatName,
|
|
const GlobalVariable *&GVar) {
|
|
const GlobalValue *GVal = M->getNamedValue(ComdatName);
|
|
if (const auto *GA = dyn_cast_or_null<GlobalAlias>(GVal)) {
|
|
GVal = GA->getBaseObject();
|
|
if (!GVal)
|
|
// We cannot resolve the size of the aliasee yet.
|
|
return emitError("Linking COMDATs named '" + ComdatName +
|
|
"': COMDAT key involves incomputable alias size.");
|
|
}
|
|
|
|
GVar = dyn_cast_or_null<GlobalVariable>(GVal);
|
|
if (!GVar)
|
|
return emitError(
|
|
"Linking COMDATs named '" + ComdatName +
|
|
"': GlobalVariable required for data dependent selection!");
|
|
|
|
return false;
|
|
}
|
|
|
|
bool ModuleLinker::computeResultingSelectionKind(StringRef ComdatName,
|
|
Comdat::SelectionKind Src,
|
|
Comdat::SelectionKind Dst,
|
|
Comdat::SelectionKind &Result,
|
|
bool &LinkFromSrc) {
|
|
// The ability to mix Comdat::SelectionKind::Any with
|
|
// Comdat::SelectionKind::Largest is a behavior that comes from COFF.
|
|
bool DstAnyOrLargest = Dst == Comdat::SelectionKind::Any ||
|
|
Dst == Comdat::SelectionKind::Largest;
|
|
bool SrcAnyOrLargest = Src == Comdat::SelectionKind::Any ||
|
|
Src == Comdat::SelectionKind::Largest;
|
|
if (DstAnyOrLargest && SrcAnyOrLargest) {
|
|
if (Dst == Comdat::SelectionKind::Largest ||
|
|
Src == Comdat::SelectionKind::Largest)
|
|
Result = Comdat::SelectionKind::Largest;
|
|
else
|
|
Result = Comdat::SelectionKind::Any;
|
|
} else if (Src == Dst) {
|
|
Result = Dst;
|
|
} else {
|
|
return emitError("Linking COMDATs named '" + ComdatName +
|
|
"': invalid selection kinds!");
|
|
}
|
|
|
|
switch (Result) {
|
|
case Comdat::SelectionKind::Any:
|
|
// Go with Dst.
|
|
LinkFromSrc = false;
|
|
break;
|
|
case Comdat::SelectionKind::NoDuplicates:
|
|
return emitError("Linking COMDATs named '" + ComdatName +
|
|
"': noduplicates has been violated!");
|
|
case Comdat::SelectionKind::ExactMatch:
|
|
case Comdat::SelectionKind::Largest:
|
|
case Comdat::SelectionKind::SameSize: {
|
|
const GlobalVariable *DstGV;
|
|
const GlobalVariable *SrcGV;
|
|
if (getComdatLeader(DstM, ComdatName, DstGV) ||
|
|
getComdatLeader(SrcM, ComdatName, SrcGV))
|
|
return true;
|
|
|
|
const DataLayout *DstDL = DstM->getDataLayout();
|
|
const DataLayout *SrcDL = SrcM->getDataLayout();
|
|
if (!DstDL || !SrcDL) {
|
|
return emitError(
|
|
"Linking COMDATs named '" + ComdatName +
|
|
"': can't do size dependent selection without DataLayout!");
|
|
}
|
|
uint64_t DstSize =
|
|
DstDL->getTypeAllocSize(DstGV->getType()->getPointerElementType());
|
|
uint64_t SrcSize =
|
|
SrcDL->getTypeAllocSize(SrcGV->getType()->getPointerElementType());
|
|
if (Result == Comdat::SelectionKind::ExactMatch) {
|
|
if (SrcGV->getInitializer() != DstGV->getInitializer())
|
|
return emitError("Linking COMDATs named '" + ComdatName +
|
|
"': ExactMatch violated!");
|
|
LinkFromSrc = false;
|
|
} else if (Result == Comdat::SelectionKind::Largest) {
|
|
LinkFromSrc = SrcSize > DstSize;
|
|
} else if (Result == Comdat::SelectionKind::SameSize) {
|
|
if (SrcSize != DstSize)
|
|
return emitError("Linking COMDATs named '" + ComdatName +
|
|
"': SameSize violated!");
|
|
LinkFromSrc = false;
|
|
} else {
|
|
llvm_unreachable("unknown selection kind");
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool ModuleLinker::getComdatResult(const Comdat *SrcC,
|
|
Comdat::SelectionKind &Result,
|
|
bool &LinkFromSrc) {
|
|
Comdat::SelectionKind SSK = SrcC->getSelectionKind();
|
|
StringRef ComdatName = SrcC->getName();
|
|
Module::ComdatSymTabType &ComdatSymTab = DstM->getComdatSymbolTable();
|
|
Module::ComdatSymTabType::iterator DstCI = ComdatSymTab.find(ComdatName);
|
|
|
|
if (DstCI == ComdatSymTab.end()) {
|
|
// Use the comdat if it is only available in one of the modules.
|
|
LinkFromSrc = true;
|
|
Result = SSK;
|
|
return false;
|
|
}
|
|
|
|
const Comdat *DstC = &DstCI->second;
|
|
Comdat::SelectionKind DSK = DstC->getSelectionKind();
|
|
return computeResultingSelectionKind(ComdatName, SSK, DSK, Result,
|
|
LinkFromSrc);
|
|
}
|
|
|
|
/// getLinkageResult - This analyzes the two global values and determines what
|
|
/// the result will look like in the destination module. In particular, it
|
|
/// computes the resultant linkage type and visibility, computes whether the
|
|
/// global in the source should be copied over to the destination (replacing
|
|
/// the existing one), and computes whether this linkage is an error or not.
|
|
bool ModuleLinker::getLinkageResult(GlobalValue *Dest, const GlobalValue *Src,
|
|
GlobalValue::LinkageTypes <,
|
|
GlobalValue::VisibilityTypes &Vis,
|
|
bool &LinkFromSrc) {
|
|
assert(Dest && "Must have two globals being queried");
|
|
assert(!Src->hasLocalLinkage() &&
|
|
"If Src has internal linkage, Dest shouldn't be set!");
|
|
|
|
bool SrcIsDeclaration = Src->isDeclaration() && !Src->isMaterializable();
|
|
bool DestIsDeclaration = Dest->isDeclaration();
|
|
|
|
if (SrcIsDeclaration) {
|
|
// If Src is external or if both Src & Dest are external.. Just link the
|
|
// external globals, we aren't adding anything.
|
|
if (Src->hasDLLImportStorageClass()) {
|
|
// If one of GVs is marked as DLLImport, result should be dllimport'ed.
|
|
if (DestIsDeclaration) {
|
|
LinkFromSrc = true;
|
|
LT = Src->getLinkage();
|
|
}
|
|
} else if (Dest->hasExternalWeakLinkage()) {
|
|
// If the Dest is weak, use the source linkage.
|
|
LinkFromSrc = true;
|
|
LT = Src->getLinkage();
|
|
} else {
|
|
LinkFromSrc = false;
|
|
LT = Dest->getLinkage();
|
|
}
|
|
} else if (DestIsDeclaration && !Dest->hasDLLImportStorageClass()) {
|
|
// If Dest is external but Src is not:
|
|
LinkFromSrc = true;
|
|
LT = Src->getLinkage();
|
|
} else if (Src->isWeakForLinker()) {
|
|
// At this point we know that Dest has LinkOnce, External*, Weak, Common,
|
|
// or DLL* linkage.
|
|
if (Dest->hasExternalWeakLinkage() ||
|
|
Dest->hasAvailableExternallyLinkage() ||
|
|
(Dest->hasLinkOnceLinkage() &&
|
|
(Src->hasWeakLinkage() || Src->hasCommonLinkage()))) {
|
|
LinkFromSrc = true;
|
|
LT = Src->getLinkage();
|
|
} else {
|
|
LinkFromSrc = false;
|
|
LT = Dest->getLinkage();
|
|
}
|
|
} else if (Dest->isWeakForLinker()) {
|
|
// At this point we know that Src has External* or DLL* linkage.
|
|
if (Src->hasExternalWeakLinkage()) {
|
|
LinkFromSrc = false;
|
|
LT = Dest->getLinkage();
|
|
} else {
|
|
LinkFromSrc = true;
|
|
LT = GlobalValue::ExternalLinkage;
|
|
}
|
|
} else {
|
|
assert((Dest->hasExternalLinkage() || Dest->hasExternalWeakLinkage()) &&
|
|
(Src->hasExternalLinkage() || Src->hasExternalWeakLinkage()) &&
|
|
"Unexpected linkage type!");
|
|
return emitError("Linking globals named '" + Src->getName() +
|
|
"': symbol multiply defined!");
|
|
}
|
|
|
|
// Compute the visibility. We follow the rules in the System V Application
|
|
// Binary Interface.
|
|
assert(!GlobalValue::isLocalLinkage(LT) &&
|
|
"Symbols with local linkage should not be merged");
|
|
Vis = isLessConstraining(Src->getVisibility(), Dest->getVisibility()) ?
|
|
Dest->getVisibility() : Src->getVisibility();
|
|
return false;
|
|
}
|
|
|
|
/// computeTypeMapping - Loop over all of the linked values to compute type
|
|
/// mappings. For example, if we link "extern Foo *x" and "Foo *x = NULL", then
|
|
/// we have two struct types 'Foo' but one got renamed when the module was
|
|
/// loaded into the same LLVMContext.
|
|
void ModuleLinker::computeTypeMapping() {
|
|
// Incorporate globals.
|
|
for (Module::global_iterator I = SrcM->global_begin(),
|
|
E = SrcM->global_end(); I != E; ++I) {
|
|
GlobalValue *DGV = getLinkedToGlobal(I);
|
|
if (!DGV) continue;
|
|
|
|
if (!DGV->hasAppendingLinkage() || !I->hasAppendingLinkage()) {
|
|
TypeMap.addTypeMapping(DGV->getType(), I->getType());
|
|
continue;
|
|
}
|
|
|
|
// Unify the element type of appending arrays.
|
|
ArrayType *DAT = cast<ArrayType>(DGV->getType()->getElementType());
|
|
ArrayType *SAT = cast<ArrayType>(I->getType()->getElementType());
|
|
TypeMap.addTypeMapping(DAT->getElementType(), SAT->getElementType());
|
|
}
|
|
|
|
// Incorporate functions.
|
|
for (Module::iterator I = SrcM->begin(), E = SrcM->end(); I != E; ++I) {
|
|
if (GlobalValue *DGV = getLinkedToGlobal(I))
|
|
TypeMap.addTypeMapping(DGV->getType(), I->getType());
|
|
}
|
|
|
|
// Incorporate types by name, scanning all the types in the source module.
|
|
// At this point, the destination module may have a type "%foo = { i32 }" for
|
|
// example. When the source module got loaded into the same LLVMContext, if
|
|
// it had the same type, it would have been renamed to "%foo.42 = { i32 }".
|
|
TypeFinder SrcStructTypes;
|
|
SrcStructTypes.run(*SrcM, true);
|
|
SmallPtrSet<StructType*, 32> SrcStructTypesSet(SrcStructTypes.begin(),
|
|
SrcStructTypes.end());
|
|
|
|
for (unsigned i = 0, e = SrcStructTypes.size(); i != e; ++i) {
|
|
StructType *ST = SrcStructTypes[i];
|
|
if (!ST->hasName()) continue;
|
|
|
|
// Check to see if there is a dot in the name followed by a digit.
|
|
size_t DotPos = ST->getName().rfind('.');
|
|
if (DotPos == 0 || DotPos == StringRef::npos ||
|
|
ST->getName().back() == '.' ||
|
|
!isdigit(static_cast<unsigned char>(ST->getName()[DotPos+1])))
|
|
continue;
|
|
|
|
// Check to see if the destination module has a struct with the prefix name.
|
|
if (StructType *DST = DstM->getTypeByName(ST->getName().substr(0, DotPos)))
|
|
// Don't use it if this actually came from the source module. They're in
|
|
// the same LLVMContext after all. Also don't use it unless the type is
|
|
// actually used in the destination module. This can happen in situations
|
|
// like this:
|
|
//
|
|
// Module A Module B
|
|
// -------- --------
|
|
// %Z = type { %A } %B = type { %C.1 }
|
|
// %A = type { %B.1, [7 x i8] } %C.1 = type { i8* }
|
|
// %B.1 = type { %C } %A.2 = type { %B.3, [5 x i8] }
|
|
// %C = type { i8* } %B.3 = type { %C.1 }
|
|
//
|
|
// When we link Module B with Module A, the '%B' in Module B is
|
|
// used. However, that would then use '%C.1'. But when we process '%C.1',
|
|
// we prefer to take the '%C' version. So we are then left with both
|
|
// '%C.1' and '%C' being used for the same types. This leads to some
|
|
// variables using one type and some using the other.
|
|
if (!SrcStructTypesSet.count(DST) && TypeMap.DstStructTypesSet.count(DST))
|
|
TypeMap.addTypeMapping(DST, ST);
|
|
}
|
|
|
|
// Don't bother incorporating aliases, they aren't generally typed well.
|
|
|
|
// Now that we have discovered all of the type equivalences, get a body for
|
|
// any 'opaque' types in the dest module that are now resolved.
|
|
TypeMap.linkDefinedTypeBodies();
|
|
}
|
|
|
|
static void upgradeGlobalArray(GlobalVariable *GV) {
|
|
ArrayType *ATy = cast<ArrayType>(GV->getType()->getElementType());
|
|
StructType *OldTy = cast<StructType>(ATy->getElementType());
|
|
assert(OldTy->getNumElements() == 2 && "Expected to upgrade from 2 elements");
|
|
|
|
// Get the upgraded 3 element type.
|
|
PointerType *VoidPtrTy = Type::getInt8Ty(GV->getContext())->getPointerTo();
|
|
Type *Tys[3] = {OldTy->getElementType(0), OldTy->getElementType(1),
|
|
VoidPtrTy};
|
|
StructType *NewTy = StructType::get(GV->getContext(), Tys, false);
|
|
|
|
// Build new constants with a null third field filled in.
|
|
Constant *OldInitC = GV->getInitializer();
|
|
ConstantArray *OldInit = dyn_cast<ConstantArray>(OldInitC);
|
|
if (!OldInit && !isa<ConstantAggregateZero>(OldInitC))
|
|
// Invalid initializer; give up.
|
|
return;
|
|
std::vector<Constant *> Initializers;
|
|
if (OldInit && OldInit->getNumOperands()) {
|
|
Value *Null = Constant::getNullValue(VoidPtrTy);
|
|
for (Use &U : OldInit->operands()) {
|
|
ConstantStruct *Init = cast<ConstantStruct>(U.get());
|
|
Initializers.push_back(ConstantStruct::get(
|
|
NewTy, Init->getOperand(0), Init->getOperand(1), Null, nullptr));
|
|
}
|
|
}
|
|
assert(Initializers.size() == ATy->getNumElements() &&
|
|
"Failed to copy all array elements");
|
|
|
|
// Replace the old GV with a new one.
|
|
ATy = ArrayType::get(NewTy, Initializers.size());
|
|
Constant *NewInit = ConstantArray::get(ATy, Initializers);
|
|
GlobalVariable *NewGV = new GlobalVariable(
|
|
*GV->getParent(), ATy, GV->isConstant(), GV->getLinkage(), NewInit, "",
|
|
GV, GV->getThreadLocalMode(), GV->getType()->getAddressSpace(),
|
|
GV->isExternallyInitialized());
|
|
NewGV->copyAttributesFrom(GV);
|
|
NewGV->takeName(GV);
|
|
assert(GV->use_empty() && "program cannot use initializer list");
|
|
GV->eraseFromParent();
|
|
}
|
|
|
|
void ModuleLinker::upgradeMismatchedGlobalArray(StringRef Name) {
|
|
// Look for the global arrays.
|
|
auto *DstGV = dyn_cast_or_null<GlobalVariable>(DstM->getNamedValue(Name));
|
|
if (!DstGV)
|
|
return;
|
|
auto *SrcGV = dyn_cast_or_null<GlobalVariable>(SrcM->getNamedValue(Name));
|
|
if (!SrcGV)
|
|
return;
|
|
|
|
// Check if the types already match.
|
|
auto *DstTy = cast<ArrayType>(DstGV->getType()->getElementType());
|
|
auto *SrcTy =
|
|
cast<ArrayType>(TypeMap.get(SrcGV->getType()->getElementType()));
|
|
if (DstTy == SrcTy)
|
|
return;
|
|
|
|
// Grab the element types. We can only upgrade an array of a two-field
|
|
// struct. Only bother if the other one has three-fields.
|
|
auto *DstEltTy = cast<StructType>(DstTy->getElementType());
|
|
auto *SrcEltTy = cast<StructType>(SrcTy->getElementType());
|
|
if (DstEltTy->getNumElements() == 2 && SrcEltTy->getNumElements() == 3) {
|
|
upgradeGlobalArray(DstGV);
|
|
return;
|
|
}
|
|
if (DstEltTy->getNumElements() == 3 && SrcEltTy->getNumElements() == 2)
|
|
upgradeGlobalArray(SrcGV);
|
|
|
|
// We can't upgrade any other differences.
|
|
}
|
|
|
|
void ModuleLinker::upgradeMismatchedGlobals() {
|
|
upgradeMismatchedGlobalArray("llvm.global_ctors");
|
|
upgradeMismatchedGlobalArray("llvm.global_dtors");
|
|
}
|
|
|
|
/// linkAppendingVarProto - If there were any appending global variables, link
|
|
/// them together now. Return true on error.
|
|
bool ModuleLinker::linkAppendingVarProto(GlobalVariable *DstGV,
|
|
GlobalVariable *SrcGV) {
|
|
|
|
if (!SrcGV->hasAppendingLinkage() || !DstGV->hasAppendingLinkage())
|
|
return emitError("Linking globals named '" + SrcGV->getName() +
|
|
"': can only link appending global with another appending global!");
|
|
|
|
ArrayType *DstTy = cast<ArrayType>(DstGV->getType()->getElementType());
|
|
ArrayType *SrcTy =
|
|
cast<ArrayType>(TypeMap.get(SrcGV->getType()->getElementType()));
|
|
Type *EltTy = DstTy->getElementType();
|
|
|
|
// Check to see that they two arrays agree on type.
|
|
if (EltTy != SrcTy->getElementType())
|
|
return emitError("Appending variables with different element types!");
|
|
if (DstGV->isConstant() != SrcGV->isConstant())
|
|
return emitError("Appending variables linked with different const'ness!");
|
|
|
|
if (DstGV->getAlignment() != SrcGV->getAlignment())
|
|
return emitError(
|
|
"Appending variables with different alignment need to be linked!");
|
|
|
|
if (DstGV->getVisibility() != SrcGV->getVisibility())
|
|
return emitError(
|
|
"Appending variables with different visibility need to be linked!");
|
|
|
|
if (DstGV->hasUnnamedAddr() != SrcGV->hasUnnamedAddr())
|
|
return emitError(
|
|
"Appending variables with different unnamed_addr need to be linked!");
|
|
|
|
if (StringRef(DstGV->getSection()) != SrcGV->getSection())
|
|
return emitError(
|
|
"Appending variables with different section name need to be linked!");
|
|
|
|
uint64_t NewSize = DstTy->getNumElements() + SrcTy->getNumElements();
|
|
ArrayType *NewType = ArrayType::get(EltTy, NewSize);
|
|
|
|
// Create the new global variable.
|
|
GlobalVariable *NG =
|
|
new GlobalVariable(*DstGV->getParent(), NewType, SrcGV->isConstant(),
|
|
DstGV->getLinkage(), /*init*/nullptr, /*name*/"", DstGV,
|
|
DstGV->getThreadLocalMode(),
|
|
DstGV->getType()->getAddressSpace());
|
|
|
|
// Propagate alignment, visibility and section info.
|
|
copyGVAttributes(NG, DstGV);
|
|
|
|
AppendingVarInfo AVI;
|
|
AVI.NewGV = NG;
|
|
AVI.DstInit = DstGV->getInitializer();
|
|
AVI.SrcInit = SrcGV->getInitializer();
|
|
AppendingVars.push_back(AVI);
|
|
|
|
// Replace any uses of the two global variables with uses of the new
|
|
// global.
|
|
ValueMap[SrcGV] = ConstantExpr::getBitCast(NG, TypeMap.get(SrcGV->getType()));
|
|
|
|
DstGV->replaceAllUsesWith(ConstantExpr::getBitCast(NG, DstGV->getType()));
|
|
DstGV->eraseFromParent();
|
|
|
|
// Track the source variable so we don't try to link it.
|
|
DoNotLinkFromSource.insert(SrcGV);
|
|
|
|
return false;
|
|
}
|
|
|
|
/// linkGlobalProto - Loop through the global variables in the src module and
|
|
/// merge them into the dest module.
|
|
bool ModuleLinker::linkGlobalProto(GlobalVariable *SGV) {
|
|
GlobalValue *DGV = getLinkedToGlobal(SGV);
|
|
llvm::Optional<GlobalValue::VisibilityTypes> NewVisibility;
|
|
bool HasUnnamedAddr = SGV->hasUnnamedAddr();
|
|
|
|
bool LinkFromSrc = false;
|
|
Comdat *DC = nullptr;
|
|
if (const Comdat *SC = SGV->getComdat()) {
|
|
Comdat::SelectionKind SK;
|
|
std::tie(SK, LinkFromSrc) = ComdatsChosen[SC];
|
|
DC = DstM->getOrInsertComdat(SC->getName());
|
|
DC->setSelectionKind(SK);
|
|
}
|
|
|
|
if (DGV) {
|
|
if (!DC) {
|
|
// Concatenation of appending linkage variables is magic and handled later.
|
|
if (DGV->hasAppendingLinkage() || SGV->hasAppendingLinkage())
|
|
return linkAppendingVarProto(cast<GlobalVariable>(DGV), SGV);
|
|
|
|
// Determine whether linkage of these two globals follows the source
|
|
// module's definition or the destination module's definition.
|
|
GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage;
|
|
GlobalValue::VisibilityTypes NV;
|
|
if (getLinkageResult(DGV, SGV, NewLinkage, NV, LinkFromSrc))
|
|
return true;
|
|
NewVisibility = NV;
|
|
HasUnnamedAddr = HasUnnamedAddr && DGV->hasUnnamedAddr();
|
|
|
|
// If we're not linking from the source, then keep the definition that we
|
|
// have.
|
|
if (!LinkFromSrc) {
|
|
// Special case for const propagation.
|
|
if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV))
|
|
if (DGVar->isDeclaration() && SGV->isConstant() &&
|
|
!DGVar->isConstant())
|
|
DGVar->setConstant(true);
|
|
|
|
// Set calculated linkage, visibility and unnamed_addr.
|
|
DGV->setLinkage(NewLinkage);
|
|
DGV->setVisibility(*NewVisibility);
|
|
DGV->setUnnamedAddr(HasUnnamedAddr);
|
|
}
|
|
}
|
|
|
|
if (!LinkFromSrc) {
|
|
// Make sure to remember this mapping.
|
|
ValueMap[SGV] = ConstantExpr::getBitCast(DGV,TypeMap.get(SGV->getType()));
|
|
|
|
// Track the source global so that we don't attempt to copy it over when
|
|
// processing global initializers.
|
|
DoNotLinkFromSource.insert(SGV);
|
|
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// If the Comdat this variable was inside of wasn't selected, skip it.
|
|
if (DC && !DGV && !LinkFromSrc) {
|
|
DoNotLinkFromSource.insert(SGV);
|
|
return false;
|
|
}
|
|
|
|
// No linking to be performed or linking from the source: simply create an
|
|
// identical version of the symbol over in the dest module... the
|
|
// initializer will be filled in later by LinkGlobalInits.
|
|
GlobalVariable *NewDGV =
|
|
new GlobalVariable(*DstM, TypeMap.get(SGV->getType()->getElementType()),
|
|
SGV->isConstant(), SGV->getLinkage(), /*init*/nullptr,
|
|
SGV->getName(), /*insertbefore*/nullptr,
|
|
SGV->getThreadLocalMode(),
|
|
SGV->getType()->getAddressSpace());
|
|
// Propagate alignment, visibility and section info.
|
|
copyGVAttributes(NewDGV, SGV);
|
|
if (NewVisibility)
|
|
NewDGV->setVisibility(*NewVisibility);
|
|
NewDGV->setUnnamedAddr(HasUnnamedAddr);
|
|
|
|
if (DC)
|
|
NewDGV->setComdat(DC);
|
|
|
|
if (DGV) {
|
|
DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDGV, DGV->getType()));
|
|
DGV->eraseFromParent();
|
|
}
|
|
|
|
// Make sure to remember this mapping.
|
|
ValueMap[SGV] = NewDGV;
|
|
return false;
|
|
}
|
|
|
|
/// linkFunctionProto - Link the function in the source module into the
|
|
/// destination module if needed, setting up mapping information.
|
|
bool ModuleLinker::linkFunctionProto(Function *SF) {
|
|
GlobalValue *DGV = getLinkedToGlobal(SF);
|
|
llvm::Optional<GlobalValue::VisibilityTypes> NewVisibility;
|
|
bool HasUnnamedAddr = SF->hasUnnamedAddr();
|
|
|
|
bool LinkFromSrc = false;
|
|
Comdat *DC = nullptr;
|
|
if (const Comdat *SC = SF->getComdat()) {
|
|
Comdat::SelectionKind SK;
|
|
std::tie(SK, LinkFromSrc) = ComdatsChosen[SC];
|
|
DC = DstM->getOrInsertComdat(SC->getName());
|
|
DC->setSelectionKind(SK);
|
|
}
|
|
|
|
if (DGV) {
|
|
if (!DC) {
|
|
GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage;
|
|
GlobalValue::VisibilityTypes NV;
|
|
if (getLinkageResult(DGV, SF, NewLinkage, NV, LinkFromSrc))
|
|
return true;
|
|
NewVisibility = NV;
|
|
HasUnnamedAddr = HasUnnamedAddr && DGV->hasUnnamedAddr();
|
|
|
|
if (!LinkFromSrc) {
|
|
// Set calculated linkage
|
|
DGV->setLinkage(NewLinkage);
|
|
DGV->setVisibility(*NewVisibility);
|
|
DGV->setUnnamedAddr(HasUnnamedAddr);
|
|
}
|
|
}
|
|
|
|
if (!LinkFromSrc) {
|
|
// Make sure to remember this mapping.
|
|
ValueMap[SF] = ConstantExpr::getBitCast(DGV, TypeMap.get(SF->getType()));
|
|
|
|
// Track the function from the source module so we don't attempt to remap
|
|
// it.
|
|
DoNotLinkFromSource.insert(SF);
|
|
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// If the function is to be lazily linked, don't create it just yet.
|
|
// The ValueMaterializerTy will deal with creating it if it's used.
|
|
if (!DGV && (SF->hasLocalLinkage() || SF->hasLinkOnceLinkage() ||
|
|
SF->hasAvailableExternallyLinkage())) {
|
|
DoNotLinkFromSource.insert(SF);
|
|
return false;
|
|
}
|
|
|
|
// If the Comdat this function was inside of wasn't selected, skip it.
|
|
if (DC && !DGV && !LinkFromSrc) {
|
|
DoNotLinkFromSource.insert(SF);
|
|
return false;
|
|
}
|
|
|
|
// If there is no linkage to be performed or we are linking from the source,
|
|
// bring SF over.
|
|
Function *NewDF = Function::Create(TypeMap.get(SF->getFunctionType()),
|
|
SF->getLinkage(), SF->getName(), DstM);
|
|
copyGVAttributes(NewDF, SF);
|
|
if (NewVisibility)
|
|
NewDF->setVisibility(*NewVisibility);
|
|
NewDF->setUnnamedAddr(HasUnnamedAddr);
|
|
|
|
if (DC)
|
|
NewDF->setComdat(DC);
|
|
|
|
if (DGV) {
|
|
// Any uses of DF need to change to NewDF, with cast.
|
|
DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDF, DGV->getType()));
|
|
DGV->eraseFromParent();
|
|
}
|
|
|
|
ValueMap[SF] = NewDF;
|
|
return false;
|
|
}
|
|
|
|
/// LinkAliasProto - Set up prototypes for any aliases that come over from the
|
|
/// source module.
|
|
bool ModuleLinker::linkAliasProto(GlobalAlias *SGA) {
|
|
GlobalValue *DGV = getLinkedToGlobal(SGA);
|
|
llvm::Optional<GlobalValue::VisibilityTypes> NewVisibility;
|
|
bool HasUnnamedAddr = SGA->hasUnnamedAddr();
|
|
|
|
bool LinkFromSrc = false;
|
|
Comdat *DC = nullptr;
|
|
if (const Comdat *SC = SGA->getComdat()) {
|
|
Comdat::SelectionKind SK;
|
|
std::tie(SK, LinkFromSrc) = ComdatsChosen[SC];
|
|
DC = DstM->getOrInsertComdat(SC->getName());
|
|
DC->setSelectionKind(SK);
|
|
}
|
|
|
|
if (DGV) {
|
|
if (!DC) {
|
|
GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage;
|
|
GlobalValue::VisibilityTypes NV;
|
|
if (getLinkageResult(DGV, SGA, NewLinkage, NV, LinkFromSrc))
|
|
return true;
|
|
NewVisibility = NV;
|
|
HasUnnamedAddr = HasUnnamedAddr && DGV->hasUnnamedAddr();
|
|
|
|
if (!LinkFromSrc) {
|
|
// Set calculated linkage.
|
|
DGV->setLinkage(NewLinkage);
|
|
DGV->setVisibility(*NewVisibility);
|
|
DGV->setUnnamedAddr(HasUnnamedAddr);
|
|
}
|
|
}
|
|
|
|
if (!LinkFromSrc) {
|
|
// Make sure to remember this mapping.
|
|
ValueMap[SGA] = ConstantExpr::getBitCast(DGV,TypeMap.get(SGA->getType()));
|
|
|
|
// Track the alias from the source module so we don't attempt to remap it.
|
|
DoNotLinkFromSource.insert(SGA);
|
|
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// If the Comdat this alias was inside of wasn't selected, skip it.
|
|
if (DC && !DGV && !LinkFromSrc) {
|
|
DoNotLinkFromSource.insert(SGA);
|
|
return false;
|
|
}
|
|
|
|
// If there is no linkage to be performed or we're linking from the source,
|
|
// bring over SGA.
|
|
auto *PTy = cast<PointerType>(TypeMap.get(SGA->getType()));
|
|
auto *NewDA =
|
|
GlobalAlias::create(PTy->getElementType(), PTy->getAddressSpace(),
|
|
SGA->getLinkage(), SGA->getName(), DstM);
|
|
copyGVAttributes(NewDA, SGA);
|
|
if (NewVisibility)
|
|
NewDA->setVisibility(*NewVisibility);
|
|
NewDA->setUnnamedAddr(HasUnnamedAddr);
|
|
|
|
if (DGV) {
|
|
// Any uses of DGV need to change to NewDA, with cast.
|
|
DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDA, DGV->getType()));
|
|
DGV->eraseFromParent();
|
|
}
|
|
|
|
ValueMap[SGA] = NewDA;
|
|
return false;
|
|
}
|
|
|
|
static void getArrayElements(Constant *C, SmallVectorImpl<Constant*> &Dest) {
|
|
unsigned NumElements = cast<ArrayType>(C->getType())->getNumElements();
|
|
|
|
for (unsigned i = 0; i != NumElements; ++i)
|
|
Dest.push_back(C->getAggregateElement(i));
|
|
}
|
|
|
|
void ModuleLinker::linkAppendingVarInit(const AppendingVarInfo &AVI) {
|
|
// Merge the initializer.
|
|
SmallVector<Constant*, 16> Elements;
|
|
getArrayElements(AVI.DstInit, Elements);
|
|
|
|
Constant *SrcInit = MapValue(AVI.SrcInit, ValueMap, RF_None, &TypeMap, &ValMaterializer);
|
|
getArrayElements(SrcInit, Elements);
|
|
|
|
ArrayType *NewType = cast<ArrayType>(AVI.NewGV->getType()->getElementType());
|
|
AVI.NewGV->setInitializer(ConstantArray::get(NewType, Elements));
|
|
}
|
|
|
|
/// linkGlobalInits - Update the initializers in the Dest module now that all
|
|
/// globals that may be referenced are in Dest.
|
|
void ModuleLinker::linkGlobalInits() {
|
|
// Loop over all of the globals in the src module, mapping them over as we go
|
|
for (Module::const_global_iterator I = SrcM->global_begin(),
|
|
E = SrcM->global_end(); I != E; ++I) {
|
|
|
|
// Only process initialized GV's or ones not already in dest.
|
|
if (!I->hasInitializer() || DoNotLinkFromSource.count(I)) continue;
|
|
|
|
// Grab destination global variable.
|
|
GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[I]);
|
|
// Figure out what the initializer looks like in the dest module.
|
|
DGV->setInitializer(MapValue(I->getInitializer(), ValueMap,
|
|
RF_None, &TypeMap, &ValMaterializer));
|
|
}
|
|
}
|
|
|
|
/// linkFunctionBody - Copy the source function over into the dest function and
|
|
/// fix up references to values. At this point we know that Dest is an external
|
|
/// function, and that Src is not.
|
|
void ModuleLinker::linkFunctionBody(Function *Dst, Function *Src) {
|
|
assert(Src && Dst && Dst->isDeclaration() && !Src->isDeclaration());
|
|
|
|
// Go through and convert function arguments over, remembering the mapping.
|
|
Function::arg_iterator DI = Dst->arg_begin();
|
|
for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end();
|
|
I != E; ++I, ++DI) {
|
|
DI->setName(I->getName()); // Copy the name over.
|
|
|
|
// Add a mapping to our mapping.
|
|
ValueMap[I] = DI;
|
|
}
|
|
|
|
if (Mode == Linker::DestroySource) {
|
|
// Splice the body of the source function into the dest function.
|
|
Dst->getBasicBlockList().splice(Dst->end(), Src->getBasicBlockList());
|
|
|
|
// At this point, all of the instructions and values of the function are now
|
|
// copied over. The only problem is that they are still referencing values in
|
|
// the Source function as operands. Loop through all of the operands of the
|
|
// functions and patch them up to point to the local versions.
|
|
for (Function::iterator BB = Dst->begin(), BE = Dst->end(); BB != BE; ++BB)
|
|
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
|
|
RemapInstruction(I, ValueMap, RF_IgnoreMissingEntries,
|
|
&TypeMap, &ValMaterializer);
|
|
|
|
} else {
|
|
// Clone the body of the function into the dest function.
|
|
SmallVector<ReturnInst*, 8> Returns; // Ignore returns.
|
|
CloneFunctionInto(Dst, Src, ValueMap, false, Returns, "", nullptr,
|
|
&TypeMap, &ValMaterializer);
|
|
}
|
|
|
|
// There is no need to map the arguments anymore.
|
|
for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end();
|
|
I != E; ++I)
|
|
ValueMap.erase(I);
|
|
|
|
}
|
|
|
|
/// linkAliasBodies - Insert all of the aliases in Src into the Dest module.
|
|
void ModuleLinker::linkAliasBodies() {
|
|
for (Module::alias_iterator I = SrcM->alias_begin(), E = SrcM->alias_end();
|
|
I != E; ++I) {
|
|
if (DoNotLinkFromSource.count(I))
|
|
continue;
|
|
if (Constant *Aliasee = I->getAliasee()) {
|
|
GlobalAlias *DA = cast<GlobalAlias>(ValueMap[I]);
|
|
Constant *Val =
|
|
MapValue(Aliasee, ValueMap, RF_None, &TypeMap, &ValMaterializer);
|
|
DA->setAliasee(Val);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// linkNamedMDNodes - Insert all of the named MDNodes in Src into the Dest
|
|
/// module.
|
|
void ModuleLinker::linkNamedMDNodes() {
|
|
const NamedMDNode *SrcModFlags = SrcM->getModuleFlagsMetadata();
|
|
for (Module::const_named_metadata_iterator I = SrcM->named_metadata_begin(),
|
|
E = SrcM->named_metadata_end(); I != E; ++I) {
|
|
// Don't link module flags here. Do them separately.
|
|
if (&*I == SrcModFlags) continue;
|
|
NamedMDNode *DestNMD = DstM->getOrInsertNamedMetadata(I->getName());
|
|
// Add Src elements into Dest node.
|
|
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
|
|
DestNMD->addOperand(MapValue(I->getOperand(i), ValueMap,
|
|
RF_None, &TypeMap, &ValMaterializer));
|
|
}
|
|
}
|
|
|
|
/// linkModuleFlagsMetadata - Merge the linker flags in Src into the Dest
|
|
/// module.
|
|
bool ModuleLinker::linkModuleFlagsMetadata() {
|
|
// If the source module has no module flags, we are done.
|
|
const NamedMDNode *SrcModFlags = SrcM->getModuleFlagsMetadata();
|
|
if (!SrcModFlags) return false;
|
|
|
|
// If the destination module doesn't have module flags yet, then just copy
|
|
// over the source module's flags.
|
|
NamedMDNode *DstModFlags = DstM->getOrInsertModuleFlagsMetadata();
|
|
if (DstModFlags->getNumOperands() == 0) {
|
|
for (unsigned I = 0, E = SrcModFlags->getNumOperands(); I != E; ++I)
|
|
DstModFlags->addOperand(SrcModFlags->getOperand(I));
|
|
|
|
return false;
|
|
}
|
|
|
|
// First build a map of the existing module flags and requirements.
|
|
DenseMap<MDString*, MDNode*> Flags;
|
|
SmallSetVector<MDNode*, 16> Requirements;
|
|
for (unsigned I = 0, E = DstModFlags->getNumOperands(); I != E; ++I) {
|
|
MDNode *Op = DstModFlags->getOperand(I);
|
|
ConstantInt *Behavior = cast<ConstantInt>(Op->getOperand(0));
|
|
MDString *ID = cast<MDString>(Op->getOperand(1));
|
|
|
|
if (Behavior->getZExtValue() == Module::Require) {
|
|
Requirements.insert(cast<MDNode>(Op->getOperand(2)));
|
|
} else {
|
|
Flags[ID] = Op;
|
|
}
|
|
}
|
|
|
|
// Merge in the flags from the source module, and also collect its set of
|
|
// requirements.
|
|
bool HasErr = false;
|
|
for (unsigned I = 0, E = SrcModFlags->getNumOperands(); I != E; ++I) {
|
|
MDNode *SrcOp = SrcModFlags->getOperand(I);
|
|
ConstantInt *SrcBehavior = cast<ConstantInt>(SrcOp->getOperand(0));
|
|
MDString *ID = cast<MDString>(SrcOp->getOperand(1));
|
|
MDNode *DstOp = Flags.lookup(ID);
|
|
unsigned SrcBehaviorValue = SrcBehavior->getZExtValue();
|
|
|
|
// If this is a requirement, add it and continue.
|
|
if (SrcBehaviorValue == Module::Require) {
|
|
// If the destination module does not already have this requirement, add
|
|
// it.
|
|
if (Requirements.insert(cast<MDNode>(SrcOp->getOperand(2)))) {
|
|
DstModFlags->addOperand(SrcOp);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
// If there is no existing flag with this ID, just add it.
|
|
if (!DstOp) {
|
|
Flags[ID] = SrcOp;
|
|
DstModFlags->addOperand(SrcOp);
|
|
continue;
|
|
}
|
|
|
|
// Otherwise, perform a merge.
|
|
ConstantInt *DstBehavior = cast<ConstantInt>(DstOp->getOperand(0));
|
|
unsigned DstBehaviorValue = DstBehavior->getZExtValue();
|
|
|
|
// If either flag has override behavior, handle it first.
|
|
if (DstBehaviorValue == Module::Override) {
|
|
// Diagnose inconsistent flags which both have override behavior.
|
|
if (SrcBehaviorValue == Module::Override &&
|
|
SrcOp->getOperand(2) != DstOp->getOperand(2)) {
|
|
HasErr |= emitError("linking module flags '" + ID->getString() +
|
|
"': IDs have conflicting override values");
|
|
}
|
|
continue;
|
|
} else if (SrcBehaviorValue == Module::Override) {
|
|
// Update the destination flag to that of the source.
|
|
DstOp->replaceOperandWith(0, SrcBehavior);
|
|
DstOp->replaceOperandWith(2, SrcOp->getOperand(2));
|
|
continue;
|
|
}
|
|
|
|
// Diagnose inconsistent merge behavior types.
|
|
if (SrcBehaviorValue != DstBehaviorValue) {
|
|
HasErr |= emitError("linking module flags '" + ID->getString() +
|
|
"': IDs have conflicting behaviors");
|
|
continue;
|
|
}
|
|
|
|
// Perform the merge for standard behavior types.
|
|
switch (SrcBehaviorValue) {
|
|
case Module::Require:
|
|
case Module::Override: llvm_unreachable("not possible");
|
|
case Module::Error: {
|
|
// Emit an error if the values differ.
|
|
if (SrcOp->getOperand(2) != DstOp->getOperand(2)) {
|
|
HasErr |= emitError("linking module flags '" + ID->getString() +
|
|
"': IDs have conflicting values");
|
|
}
|
|
continue;
|
|
}
|
|
case Module::Warning: {
|
|
// Emit a warning if the values differ.
|
|
if (SrcOp->getOperand(2) != DstOp->getOperand(2)) {
|
|
if (!SuppressWarnings) {
|
|
errs() << "WARNING: linking module flags '" << ID->getString()
|
|
<< "': IDs have conflicting values";
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
case Module::Append: {
|
|
MDNode *DstValue = cast<MDNode>(DstOp->getOperand(2));
|
|
MDNode *SrcValue = cast<MDNode>(SrcOp->getOperand(2));
|
|
unsigned NumOps = DstValue->getNumOperands() + SrcValue->getNumOperands();
|
|
Value **VP, **Values = VP = new Value*[NumOps];
|
|
for (unsigned i = 0, e = DstValue->getNumOperands(); i != e; ++i, ++VP)
|
|
*VP = DstValue->getOperand(i);
|
|
for (unsigned i = 0, e = SrcValue->getNumOperands(); i != e; ++i, ++VP)
|
|
*VP = SrcValue->getOperand(i);
|
|
DstOp->replaceOperandWith(2, MDNode::get(DstM->getContext(),
|
|
ArrayRef<Value*>(Values,
|
|
NumOps)));
|
|
delete[] Values;
|
|
break;
|
|
}
|
|
case Module::AppendUnique: {
|
|
SmallSetVector<Value*, 16> Elts;
|
|
MDNode *DstValue = cast<MDNode>(DstOp->getOperand(2));
|
|
MDNode *SrcValue = cast<MDNode>(SrcOp->getOperand(2));
|
|
for (unsigned i = 0, e = DstValue->getNumOperands(); i != e; ++i)
|
|
Elts.insert(DstValue->getOperand(i));
|
|
for (unsigned i = 0, e = SrcValue->getNumOperands(); i != e; ++i)
|
|
Elts.insert(SrcValue->getOperand(i));
|
|
DstOp->replaceOperandWith(2, MDNode::get(DstM->getContext(),
|
|
ArrayRef<Value*>(Elts.begin(),
|
|
Elts.end())));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check all of the requirements.
|
|
for (unsigned I = 0, E = Requirements.size(); I != E; ++I) {
|
|
MDNode *Requirement = Requirements[I];
|
|
MDString *Flag = cast<MDString>(Requirement->getOperand(0));
|
|
Value *ReqValue = Requirement->getOperand(1);
|
|
|
|
MDNode *Op = Flags[Flag];
|
|
if (!Op || Op->getOperand(2) != ReqValue) {
|
|
HasErr |= emitError("linking module flags '" + Flag->getString() +
|
|
"': does not have the required value");
|
|
continue;
|
|
}
|
|
}
|
|
|
|
return HasErr;
|
|
}
|
|
|
|
bool ModuleLinker::run() {
|
|
assert(DstM && "Null destination module");
|
|
assert(SrcM && "Null source module");
|
|
|
|
// Inherit the target data from the source module if the destination module
|
|
// doesn't have one already.
|
|
if (!DstM->getDataLayout() && SrcM->getDataLayout())
|
|
DstM->setDataLayout(SrcM->getDataLayout());
|
|
|
|
// Copy the target triple from the source to dest if the dest's is empty.
|
|
if (DstM->getTargetTriple().empty() && !SrcM->getTargetTriple().empty())
|
|
DstM->setTargetTriple(SrcM->getTargetTriple());
|
|
|
|
if (SrcM->getDataLayout() && DstM->getDataLayout() &&
|
|
*SrcM->getDataLayout() != *DstM->getDataLayout()) {
|
|
if (!SuppressWarnings) {
|
|
errs() << "WARNING: Linking two modules of different data layouts: '"
|
|
<< SrcM->getModuleIdentifier() << "' is '"
|
|
<< SrcM->getDataLayoutStr() << "' whereas '"
|
|
<< DstM->getModuleIdentifier() << "' is '"
|
|
<< DstM->getDataLayoutStr() << "'\n";
|
|
}
|
|
}
|
|
if (!SrcM->getTargetTriple().empty() &&
|
|
DstM->getTargetTriple() != SrcM->getTargetTriple()) {
|
|
if (!SuppressWarnings) {
|
|
errs() << "WARNING: Linking two modules of different target triples: "
|
|
<< SrcM->getModuleIdentifier() << "' is '"
|
|
<< SrcM->getTargetTriple() << "' whereas '"
|
|
<< DstM->getModuleIdentifier() << "' is '"
|
|
<< DstM->getTargetTriple() << "'\n";
|
|
}
|
|
}
|
|
|
|
// Append the module inline asm string.
|
|
if (!SrcM->getModuleInlineAsm().empty()) {
|
|
if (DstM->getModuleInlineAsm().empty())
|
|
DstM->setModuleInlineAsm(SrcM->getModuleInlineAsm());
|
|
else
|
|
DstM->setModuleInlineAsm(DstM->getModuleInlineAsm()+"\n"+
|
|
SrcM->getModuleInlineAsm());
|
|
}
|
|
|
|
// Loop over all of the linked values to compute type mappings.
|
|
computeTypeMapping();
|
|
|
|
ComdatsChosen.clear();
|
|
for (const StringMapEntry<llvm::Comdat> &SMEC : SrcM->getComdatSymbolTable()) {
|
|
const Comdat &C = SMEC.getValue();
|
|
if (ComdatsChosen.count(&C))
|
|
continue;
|
|
Comdat::SelectionKind SK;
|
|
bool LinkFromSrc;
|
|
if (getComdatResult(&C, SK, LinkFromSrc))
|
|
return true;
|
|
ComdatsChosen[&C] = std::make_pair(SK, LinkFromSrc);
|
|
}
|
|
|
|
// Upgrade mismatched global arrays.
|
|
upgradeMismatchedGlobals();
|
|
|
|
// Insert all of the globals in src into the DstM module... without linking
|
|
// initializers (which could refer to functions not yet mapped over).
|
|
for (Module::global_iterator I = SrcM->global_begin(),
|
|
E = SrcM->global_end(); I != E; ++I)
|
|
if (linkGlobalProto(I))
|
|
return true;
|
|
|
|
// Link the functions together between the two modules, without doing function
|
|
// bodies... this just adds external function prototypes to the DstM
|
|
// function... We do this so that when we begin processing function bodies,
|
|
// all of the global values that may be referenced are available in our
|
|
// ValueMap.
|
|
for (Module::iterator I = SrcM->begin(), E = SrcM->end(); I != E; ++I)
|
|
if (linkFunctionProto(I))
|
|
return true;
|
|
|
|
// If there were any aliases, link them now.
|
|
for (Module::alias_iterator I = SrcM->alias_begin(),
|
|
E = SrcM->alias_end(); I != E; ++I)
|
|
if (linkAliasProto(I))
|
|
return true;
|
|
|
|
for (unsigned i = 0, e = AppendingVars.size(); i != e; ++i)
|
|
linkAppendingVarInit(AppendingVars[i]);
|
|
|
|
// Link in the function bodies that are defined in the source module into
|
|
// DstM.
|
|
for (Module::iterator SF = SrcM->begin(), E = SrcM->end(); SF != E; ++SF) {
|
|
// Skip if not linking from source.
|
|
if (DoNotLinkFromSource.count(SF)) continue;
|
|
|
|
Function *DF = cast<Function>(ValueMap[SF]);
|
|
if (SF->hasPrefixData()) {
|
|
// Link in the prefix data.
|
|
DF->setPrefixData(MapValue(
|
|
SF->getPrefixData(), ValueMap, RF_None, &TypeMap, &ValMaterializer));
|
|
}
|
|
|
|
// Skip if no body (function is external) or materialize.
|
|
if (SF->isDeclaration()) {
|
|
if (!SF->isMaterializable())
|
|
continue;
|
|
if (SF->Materialize(&ErrorMsg))
|
|
return true;
|
|
}
|
|
|
|
linkFunctionBody(DF, SF);
|
|
SF->Dematerialize();
|
|
}
|
|
|
|
// Resolve all uses of aliases with aliasees.
|
|
linkAliasBodies();
|
|
|
|
// Remap all of the named MDNodes in Src into the DstM module. We do this
|
|
// after linking GlobalValues so that MDNodes that reference GlobalValues
|
|
// are properly remapped.
|
|
linkNamedMDNodes();
|
|
|
|
// Merge the module flags into the DstM module.
|
|
if (linkModuleFlagsMetadata())
|
|
return true;
|
|
|
|
// Update the initializers in the DstM module now that all globals that may
|
|
// be referenced are in DstM.
|
|
linkGlobalInits();
|
|
|
|
// Process vector of lazily linked in functions.
|
|
bool LinkedInAnyFunctions;
|
|
do {
|
|
LinkedInAnyFunctions = false;
|
|
|
|
for(std::vector<Function*>::iterator I = LazilyLinkFunctions.begin(),
|
|
E = LazilyLinkFunctions.end(); I != E; ++I) {
|
|
Function *SF = *I;
|
|
if (!SF)
|
|
continue;
|
|
|
|
Function *DF = cast<Function>(ValueMap[SF]);
|
|
if (SF->hasPrefixData()) {
|
|
// Link in the prefix data.
|
|
DF->setPrefixData(MapValue(SF->getPrefixData(),
|
|
ValueMap,
|
|
RF_None,
|
|
&TypeMap,
|
|
&ValMaterializer));
|
|
}
|
|
|
|
// Materialize if necessary.
|
|
if (SF->isDeclaration()) {
|
|
if (!SF->isMaterializable())
|
|
continue;
|
|
if (SF->Materialize(&ErrorMsg))
|
|
return true;
|
|
}
|
|
|
|
// Erase from vector *before* the function body is linked - linkFunctionBody could
|
|
// invalidate I.
|
|
LazilyLinkFunctions.erase(I);
|
|
|
|
// Link in function body.
|
|
linkFunctionBody(DF, SF);
|
|
SF->Dematerialize();
|
|
|
|
// Set flag to indicate we may have more functions to lazily link in
|
|
// since we linked in a function.
|
|
LinkedInAnyFunctions = true;
|
|
break;
|
|
}
|
|
} while (LinkedInAnyFunctions);
|
|
|
|
// Now that all of the types from the source are used, resolve any structs
|
|
// copied over to the dest that didn't exist there.
|
|
TypeMap.linkDefinedTypeBodies();
|
|
|
|
return false;
|
|
}
|
|
|
|
Linker::Linker(Module *M, bool SuppressWarnings)
|
|
: Composite(M), SuppressWarnings(SuppressWarnings) {
|
|
TypeFinder StructTypes;
|
|
StructTypes.run(*M, true);
|
|
IdentifiedStructTypes.insert(StructTypes.begin(), StructTypes.end());
|
|
}
|
|
|
|
Linker::~Linker() {
|
|
}
|
|
|
|
void Linker::deleteModule() {
|
|
delete Composite;
|
|
Composite = nullptr;
|
|
}
|
|
|
|
bool Linker::linkInModule(Module *Src, unsigned Mode, std::string *ErrorMsg) {
|
|
ModuleLinker TheLinker(Composite, IdentifiedStructTypes, Src, Mode,
|
|
SuppressWarnings);
|
|
if (TheLinker.run()) {
|
|
if (ErrorMsg)
|
|
*ErrorMsg = TheLinker.ErrorMsg;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// LinkModules entrypoint.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// LinkModules - 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, Module *Src, unsigned Mode,
|
|
std::string *ErrorMsg) {
|
|
Linker L(Dest);
|
|
return L.linkInModule(Src, Mode, ErrorMsg);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// C API.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
LLVMBool LLVMLinkModules(LLVMModuleRef Dest, LLVMModuleRef Src,
|
|
LLVMLinkerMode Mode, char **OutMessages) {
|
|
std::string Messages;
|
|
LLVMBool Result = Linker::LinkModules(unwrap(Dest), unwrap(Src),
|
|
Mode, OutMessages? &Messages : nullptr);
|
|
if (OutMessages)
|
|
*OutMessages = strdup(Messages.c_str());
|
|
return Result;
|
|
}
|