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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2033 91177308-0d34-0410-b5e6-96231b3b80d8
131 lines
4.4 KiB
C++
131 lines
4.4 KiB
C++
//===-- Module.cpp - Implement the Module class ------------------*- C++ -*--=//
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//
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// This file implements the Module class for the VMCore library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/InstrTypes.h"
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#include "llvm/ValueHolderImpl.h"
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#include "llvm/Type.h"
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#include "llvm/ConstantVals.h"
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#include "llvm/DerivedTypes.h"
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#include "Support/STLExtras.h"
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#include <map>
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// Instantiate Templates - This ugliness is the price we have to pay
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// for having a DefHolderImpl.h file seperate from DefHolder.h! :(
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//
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template class ValueHolder<GlobalVariable, Module, Module>;
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template class ValueHolder<Function, Module, Module>;
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// Define the GlobalValueRefMap as a struct that wraps a map so that we don't
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// have Module.h depend on <map>
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//
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struct GlobalValueRefMap : public std::map<GlobalValue*, ConstantPointerRef*>{
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};
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Module::Module()
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: Value(Type::VoidTy, Value::ModuleVal, ""), SymTabValue(this),
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GlobalList(this, this), FunctionList(this, this), GVRefMap(0) {
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}
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Module::~Module() {
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dropAllReferences();
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GlobalList.delete_all();
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GlobalList.setParent(0);
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FunctionList.delete_all();
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FunctionList.setParent(0);
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}
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// getOrInsertFunction - Look up the specified function in the module symbol
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// table. If it does not exist, add a prototype for the function and return
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// it. This is nice because it allows most passes to get away with not handling
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// the symbol table directly for this common task.
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//
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Function *Module::getOrInsertFunction(const std::string &Name,
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const FunctionType *Ty) {
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SymbolTable *SymTab = getSymbolTableSure();
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// See if we have a definitions for the specified function already...
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if (Value *V = SymTab->lookup(PointerType::get(Ty), Name)) {
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return cast<Function>(V); // Yup, got it
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} else { // Nope, add one
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Function *New = new Function(Ty, false, Name);
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FunctionList.push_back(New);
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return New; // Return the new prototype...
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}
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}
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// getFunction - Look up the specified function in the module symbol table.
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// If it does not exist, return null.
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//
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Function *Module::getFunction(const std::string &Name, const FunctionType *Ty) {
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SymbolTable *SymTab = getSymbolTable();
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if (SymTab == 0) return 0; // No symtab, no symbols...
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return cast_or_null<Function>(SymTab->lookup(PointerType::get(Ty), Name));
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}
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// dropAllReferences() - This function causes all the subinstructions to "let
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// go" of all references that they are maintaining. This allows one to
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// 'delete' a whole class at a time, even though there may be circular
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// references... first all references are dropped, and all use counts go to
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// zero. Then everything is delete'd for real. Note that no operations are
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// valid on an object that has "dropped all references", except operator
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// delete.
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//
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void Module::dropAllReferences() {
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for_each(FunctionList.begin(), FunctionList.end(),
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std::mem_fun(&Function::dropAllReferences));
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for_each(GlobalList.begin(), GlobalList.end(),
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std::mem_fun(&GlobalVariable::dropAllReferences));
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// If there are any GlobalVariable references still out there, nuke them now.
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// Since all references are hereby dropped, nothing could possibly reference
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// them still.
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if (GVRefMap) {
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for (GlobalValueRefMap::iterator I = GVRefMap->begin(), E = GVRefMap->end();
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I != E; ++I) {
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// Delete the ConstantPointerRef node...
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I->second->destroyConstant();
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}
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// Since the table is empty, we can now delete it...
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delete GVRefMap;
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}
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}
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// Accessor for the underlying GlobalValRefMap...
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ConstantPointerRef *Module::getConstantPointerRef(GlobalValue *V){
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// Create ref map lazily on demand...
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if (GVRefMap == 0) GVRefMap = new GlobalValueRefMap();
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GlobalValueRefMap::iterator I = GVRefMap->find(V);
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if (I != GVRefMap->end()) return I->second;
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ConstantPointerRef *Ref = new ConstantPointerRef(V);
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GVRefMap->insert(std::make_pair(V, Ref));
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return Ref;
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}
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void Module::mutateConstantPointerRef(GlobalValue *OldGV, GlobalValue *NewGV) {
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GlobalValueRefMap::iterator I = GVRefMap->find(OldGV);
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assert(I != GVRefMap->end() &&
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"mutateConstantPointerRef; OldGV not in table!");
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ConstantPointerRef *Ref = I->second;
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// Remove the old entry...
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GVRefMap->erase(I);
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// Insert the new entry...
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GVRefMap->insert(std::make_pair(NewGV, Ref));
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}
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