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78d033e086
Take an incremental step towards type plane elimination. This change separates types from values in the symbol tables by finally making use of the TypeSymbolTable class. This yields more natural interfaces for dealing with types and unclutters the SymbolTable class. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32956 91177308-0d34-0410-b5e6-96231b3b80d8
110 lines
4.1 KiB
C++
110 lines
4.1 KiB
C++
//===- CloneModule.cpp - Clone an entire module ---------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 CloneModule interface which makes a copy of an
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// entire module.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/Cloning.h"
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#include "llvm/Module.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/TypeSymbolTable.h"
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#include "llvm/Constant.h"
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#include "ValueMapper.h"
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using namespace llvm;
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/// CloneModule - Return an exact copy of the specified module. This is not as
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/// easy as it might seem because we have to worry about making copies of global
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/// variables and functions, and making their (initializers and references,
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/// respectively) refer to the right globals.
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///
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Module *llvm::CloneModule(const Module *M) {
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// Create the value map that maps things from the old module over to the new
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// module.
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std::map<const Value*, Value*> ValueMap;
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return CloneModule(M, ValueMap);
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}
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Module *llvm::CloneModule(const Module *M, std::map<const Value*, Value*> &ValueMap) {
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// First off, we need to create the new module...
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Module *New = new Module(M->getModuleIdentifier());
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New->setEndianness(M->getEndianness());
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New->setPointerSize(M->getPointerSize());
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New->setTargetTriple(M->getTargetTriple());
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New->setModuleInlineAsm(M->getModuleInlineAsm());
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// Copy all of the type symbol table entries over.
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const TypeSymbolTable &TST = M->getTypeSymbolTable();
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for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
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TI != TE; ++TI)
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New->addTypeName(TI->first, TI->second);
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// Copy all of the dependent libraries over.
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for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I)
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New->addLibrary(*I);
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// Loop over all of the global variables, making corresponding globals in the
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// new module. Here we add them to the ValueMap and to the new Module. We
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// don't worry about attributes or initializers, they will come later.
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//
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for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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I != E; ++I)
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ValueMap[I] = new GlobalVariable(I->getType()->getElementType(), false,
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GlobalValue::ExternalLinkage, 0,
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I->getName(), New);
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// Loop over the functions in the module, making external functions as before
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for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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Function *NF =
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new Function(cast<FunctionType>(I->getType()->getElementType()),
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GlobalValue::ExternalLinkage, I->getName(), New);
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NF->setCallingConv(I->getCallingConv());
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ValueMap[I]= NF;
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}
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// Now that all of the things that global variable initializer can refer to
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// have been created, loop through and copy the global variable referrers
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// over... We also set the attributes on the global now.
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//
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for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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I != E; ++I) {
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GlobalVariable *GV = cast<GlobalVariable>(ValueMap[I]);
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if (I->hasInitializer())
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GV->setInitializer(cast<Constant>(MapValue(I->getInitializer(),
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ValueMap)));
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GV->setLinkage(I->getLinkage());
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}
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// Similarly, copy over function bodies now...
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//
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for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
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Function *F = cast<Function>(ValueMap[I]);
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if (!I->isExternal()) {
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Function::arg_iterator DestI = F->arg_begin();
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for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end();
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++J) {
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DestI->setName(J->getName());
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ValueMap[J] = DestI++;
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}
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std::vector<ReturnInst*> Returns; // Ignore returns cloned...
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CloneFunctionInto(F, I, ValueMap, Returns);
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}
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F->setLinkage(I->getLinkage());
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}
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return New;
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}
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// vim: sw=2
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