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The "findUsedStructTypes" method is very expensive to run. It needs to be optimized so that LTO can run faster. Splitting this method out of the Module class will help this occur. For instance, it can keep a list of seen objects so that it doesn't process them over and over again. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161228 91177308-0d34-0410-b5e6-96231b3b80d8
149 lines
4.7 KiB
C++
149 lines
4.7 KiB
C++
//===-- TypeFinder.cpp - Implement the TypeFinder class -------------------===//
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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 TypeFinder class for the VMCore library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/TypeFinder.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/Metadata.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/SmallVector.h"
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using namespace llvm;
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void TypeFinder::run(const Module &M, bool onlyNamed) {
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OnlyNamed = onlyNamed;
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// Get types from global variables.
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for (Module::const_global_iterator I = M.global_begin(),
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E = M.global_end(); I != E; ++I) {
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incorporateType(I->getType());
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if (I->hasInitializer())
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incorporateValue(I->getInitializer());
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}
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// Get types from aliases.
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for (Module::const_alias_iterator I = M.alias_begin(),
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E = M.alias_end(); I != E; ++I) {
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incorporateType(I->getType());
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if (const Value *Aliasee = I->getAliasee())
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incorporateValue(Aliasee);
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}
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// Get types from functions.
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SmallVector<std::pair<unsigned, MDNode*>, 4> MDForInst;
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for (Module::const_iterator FI = M.begin(), E = M.end(); FI != E; ++FI) {
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incorporateType(FI->getType());
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// First incorporate the arguments.
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for (Function::const_arg_iterator AI = FI->arg_begin(),
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AE = FI->arg_end(); AI != AE; ++AI)
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incorporateValue(AI);
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for (Function::const_iterator BB = FI->begin(), E = FI->end();
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BB != E;++BB)
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for (BasicBlock::const_iterator II = BB->begin(),
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E = BB->end(); II != E; ++II) {
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const Instruction &I = *II;
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// Incorporate the type of the instruction.
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incorporateType(I.getType());
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// Incorporate non-instruction operand types. (We are incorporating all
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// instructions with this loop.)
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for (User::const_op_iterator OI = I.op_begin(), OE = I.op_end();
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OI != OE; ++OI)
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if (!isa<Instruction>(OI))
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incorporateValue(*OI);
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// Incorporate types hiding in metadata.
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I.getAllMetadataOtherThanDebugLoc(MDForInst);
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for (unsigned i = 0, e = MDForInst.size(); i != e; ++i)
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incorporateMDNode(MDForInst[i].second);
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MDForInst.clear();
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}
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}
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for (Module::const_named_metadata_iterator I = M.named_metadata_begin(),
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E = M.named_metadata_end(); I != E; ++I) {
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const NamedMDNode *NMD = I;
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for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
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incorporateMDNode(NMD->getOperand(i));
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}
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}
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void TypeFinder::clear() {
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VisitedConstants.clear();
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VisitedTypes.clear();
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StructTypes.clear();
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}
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/// incorporateType - This method adds the type to the list of used structures
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/// if it's not in there already.
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void TypeFinder::incorporateType(Type *Ty) {
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// Check to see if we're already visited this type.
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if (!VisitedTypes.insert(Ty).second)
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return;
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// If this is a structure or opaque type, add a name for the type.
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if (StructType *STy = dyn_cast<StructType>(Ty))
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if (!OnlyNamed || STy->hasName())
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StructTypes.push_back(STy);
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// Recursively walk all contained types.
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for (Type::subtype_iterator I = Ty->subtype_begin(),
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E = Ty->subtype_end(); I != E; ++I)
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incorporateType(*I);
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}
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/// incorporateValue - This method is used to walk operand lists finding types
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/// hiding in constant expressions and other operands that won't be walked in
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/// other ways. GlobalValues, basic blocks, instructions, and inst operands are
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/// all explicitly enumerated.
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void TypeFinder::incorporateValue(const Value *V) {
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if (const MDNode *M = dyn_cast<MDNode>(V))
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return incorporateMDNode(M);
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if (!isa<Constant>(V) || isa<GlobalValue>(V)) return;
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// Already visited?
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if (!VisitedConstants.insert(V).second)
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return;
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// Check this type.
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incorporateType(V->getType());
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// If this is an instruction, we incorporate it separately.
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if (isa<Instruction>(V))
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return;
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// Look in operands for types.
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const User *U = cast<User>(V);
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for (Constant::const_op_iterator I = U->op_begin(),
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E = U->op_end(); I != E;++I)
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incorporateValue(*I);
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}
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/// incorporateMDNode - This method is used to walk the operands of an MDNode to
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/// find types hiding within.
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void TypeFinder::incorporateMDNode(const MDNode *V) {
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// Already visited?
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if (!VisitedConstants.insert(V).second)
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return;
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// Look in operands for types.
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for (unsigned i = 0, e = V->getNumOperands(); i != e; ++i)
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if (Value *Op = V->getOperand(i))
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incorporateValue(Op);
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}
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