forked from OSchip/llvm-project
209 lines
6.9 KiB
C++
209 lines
6.9 KiB
C++
//===-- ValueEnumerator.cpp - Number values and types for bitcode writer --===//
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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 Chris Lattner 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 ValueEnumerator class.
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//
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//===----------------------------------------------------------------------===//
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#include "ValueEnumerator.h"
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#include "llvm/Module.h"
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#include "llvm/TypeSymbolTable.h"
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#include "llvm/ValueSymbolTable.h"
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using namespace llvm;
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/// ValueEnumerator - Enumerate module-level information.
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ValueEnumerator::ValueEnumerator(const Module *M) {
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// Enumerate the 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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EnumerateValue(I);
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// Enumerate the functions.
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for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
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EnumerateValue(I);
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// Enumerate the aliases.
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for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
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I != E; ++I)
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EnumerateValue(I);
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// Enumerate the global variable initializers.
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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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if (I->hasInitializer())
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EnumerateValue(I->getInitializer());
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// Enumerate the aliasees.
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for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
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I != E; ++I)
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EnumerateValue(I->getAliasee());
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// FIXME: Implement the 'string constant' optimization.
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// Enumerate types used by the type symbol table.
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EnumerateTypeSymbolTable(M->getTypeSymbolTable());
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// Insert constants that are named at module level into the slot pool so that
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// the module symbol table can refer to them...
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EnumerateValueSymbolTable(M->getValueSymbolTable());
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// Enumerate types used by function bodies and argument lists.
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for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
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for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
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I != E; ++I)
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EnumerateType(I->getType());
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for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
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for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E;++I){
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for (User::const_op_iterator OI = I->op_begin(), E = I->op_end();
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OI != E; ++OI)
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EnumerateType((*OI)->getType());
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EnumerateType(I->getType());
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}
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}
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// FIXME: std::partition the type and value tables so that first-class types
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// come earlier than aggregates. FIXME: Emit a marker into the module
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// indicating which aggregates types AND values can be dropped form the table.
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// FIXME: Sort type/value tables by frequency.
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// FIXME: Sort constants by type to reduce size.
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}
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/// EnumerateTypeSymbolTable - Insert all of the types in the specified symbol
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/// table.
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void ValueEnumerator::EnumerateTypeSymbolTable(const TypeSymbolTable &TST) {
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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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EnumerateType(TI->second);
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}
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/// EnumerateValueSymbolTable - Insert all of the values in the specified symbol
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/// table into the values table.
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void ValueEnumerator::EnumerateValueSymbolTable(const ValueSymbolTable &VST) {
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for (ValueSymbolTable::const_iterator VI = VST.begin(), VE = VST.end();
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VI != VE; ++VI)
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EnumerateValue(VI->getValue());
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}
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void ValueEnumerator::EnumerateValue(const Value *V) {
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assert(V->getType() != Type::VoidTy && "Can't insert void values!");
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// Check to see if it's already in!
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unsigned &ValueID = ValueMap[V];
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if (ValueID) {
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// Increment use count.
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Values[ValueID-1].second++;
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return;
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}
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// Add the value.
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Values.push_back(std::make_pair(V, 1U));
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ValueID = Values.size();
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if (const Constant *C = dyn_cast<Constant>(V)) {
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if (isa<GlobalValue>(C)) {
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// Initializers for globals are handled explicitly elsewhere.
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} else {
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// This makes sure that if a constant has uses (for example an array of
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// const ints), that they are inserted also.
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for (User::const_op_iterator I = C->op_begin(), E = C->op_end();
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I != E; ++I)
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EnumerateValue(*I);
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}
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}
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EnumerateType(V->getType());
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}
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void ValueEnumerator::EnumerateType(const Type *Ty) {
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unsigned &TypeID = TypeMap[Ty];
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if (TypeID) {
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// If we've already seen this type, just increase its occurrence count.
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Types[TypeID-1].second++;
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return;
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}
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// First time we saw this type, add it.
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Types.push_back(std::make_pair(Ty, 1U));
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TypeID = Types.size();
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// Enumerate subtypes.
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for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
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I != E; ++I)
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EnumerateType(*I);
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}
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/// PurgeAggregateValues - If there are any aggregate values at the end of the
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/// value list, remove them and return the count of the remaining values. If
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/// there are none, return -1.
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int ValueEnumerator::PurgeAggregateValues() {
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// If there are no aggregate values at the end of the list, return -1.
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if (Values.empty() || Values.back().first->getType()->isFirstClassType())
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return -1;
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// Otherwise, remove aggregate values...
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while (!Values.empty() && !Values.back().first->getType()->isFirstClassType())
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Values.pop_back();
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// ... and return the new size.
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return Values.size();
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}
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void ValueEnumerator::incorporateFunction(const Function &F) {
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NumModuleValues = Values.size();
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// Adding function arguments to the value table.
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for(Function::const_arg_iterator I = F.arg_begin(), E = F.arg_end();
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I != E; ++I)
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EnumerateValue(I);
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FirstFuncConstantID = Values.size();
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// Add all function-level constants to the value table.
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for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
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for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I)
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for (User::const_op_iterator OI = I->op_begin(), E = I->op_end();
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OI != E; ++OI) {
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if ((isa<Constant>(*OI) && !isa<GlobalValue>(*OI)) ||
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isa<InlineAsm>(*OI))
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EnumerateValue(*OI);
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}
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ValueMap[BB] = BasicBlocks.size();
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BasicBlocks.push_back(BB);
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}
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FirstInstID = Values.size();
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// Add all of the instructions.
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for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
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for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I) {
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if (I->getType() != Type::VoidTy)
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EnumerateValue(I);
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}
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}
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}
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void ValueEnumerator::purgeFunction() {
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/// Remove purged values from the ValueMap.
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for (unsigned i = NumModuleValues, e = Values.size(); i != e; ++i)
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ValueMap.erase(Values[i].first);
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for (unsigned i = 0, e = BasicBlocks.size(); i != e; ++i)
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ValueMap.erase(BasicBlocks[i]);
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Values.resize(NumModuleValues);
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BasicBlocks.clear();
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}
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