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//===-- ValueEnumerator.cpp - Number values and types for bitcode writer --===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the ValueEnumerator class.
//
//===----------------------------------------------------------------------===//
#include "ValueEnumerator.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/TypeSymbolTable.h"
#include "llvm/ValueSymbolTable.h"
using namespace llvm;
/// ValueEnumerator - Enumerate module-level information.
ValueEnumerator::ValueEnumerator(const Module *M) {
// Enumerate the global variables.
for (Module::const_global_iterator I = M->global_begin(),
E = M->global_end(); I != E; ++I)
EnumerateValue(I);
// Enumerate the functions.
for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
EnumerateValue(I);
// Enumerate the aliases.
for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
I != E; ++I)
EnumerateValue(I);
// Enumerate the global variable initializers.
for (Module::const_global_iterator I = M->global_begin(),
E = M->global_end(); I != E; ++I)
if (I->hasInitializer())
EnumerateValue(I->getInitializer());
// Enumerate the aliasees.
for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
I != E; ++I)
EnumerateValue(I->getAliasee());
// FIXME: Implement the 'string constant' optimization.
// Enumerate types used by the type symbol table.
EnumerateTypeSymbolTable(M->getTypeSymbolTable());
// Insert constants that are named at module level into the slot pool so that
// the module symbol table can refer to them...
EnumerateValueSymbolTable(M->getValueSymbolTable());
// Enumerate types used by function bodies and argument lists.
for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
I != E; ++I)
EnumerateType(I->getType());
for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E;++I){
for (User::const_op_iterator OI = I->op_begin(), E = I->op_end();
OI != E; ++OI)
EnumerateType((*OI)->getType());
EnumerateType(I->getType());
}
}
// FIXME: std::partition the type and value tables so that first-class types
// come earlier than aggregates. FIXME: Emit a marker into the module
// indicating which aggregates types AND values can be dropped form the table.
// FIXME: Sort type/value tables by frequency.
// FIXME: Sort constants by type to reduce size.
}
/// EnumerateTypeSymbolTable - Insert all of the types in the specified symbol
/// table.
void ValueEnumerator::EnumerateTypeSymbolTable(const TypeSymbolTable &TST) {
for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
TI != TE; ++TI)
EnumerateType(TI->second);
}
/// EnumerateValueSymbolTable - Insert all of the values in the specified symbol
/// table into the values table.
void ValueEnumerator::EnumerateValueSymbolTable(const ValueSymbolTable &VST) {
for (ValueSymbolTable::const_iterator VI = VST.begin(), VE = VST.end();
VI != VE; ++VI)
EnumerateValue(VI->getValue());
}
void ValueEnumerator::EnumerateValue(const Value *V) {
assert(V->getType() != Type::VoidTy && "Can't insert void values!");
// Check to see if it's already in!
unsigned &ValueID = ValueMap[V];
if (ValueID) {
// Increment use count.
Values[ValueID-1].second++;
return;
}
// Add the value.
Values.push_back(std::make_pair(V, 1U));
ValueID = Values.size();
if (const Constant *C = dyn_cast<Constant>(V)) {
if (isa<GlobalValue>(C)) {
// Initializers for globals are handled explicitly elsewhere.
} else {
// This makes sure that if a constant has uses (for example an array of
// const ints), that they are inserted also.
for (User::const_op_iterator I = C->op_begin(), E = C->op_end();
I != E; ++I)
EnumerateValue(*I);
}
}
EnumerateType(V->getType());
}
void ValueEnumerator::EnumerateType(const Type *Ty) {
unsigned &TypeID = TypeMap[Ty];
if (TypeID) {
// If we've already seen this type, just increase its occurrence count.
Types[TypeID-1].second++;
return;
}
// First time we saw this type, add it.
Types.push_back(std::make_pair(Ty, 1U));
TypeID = Types.size();
// Enumerate subtypes.
for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
I != E; ++I)
EnumerateType(*I);
// If this is a function type, enumerate the param attrs.
if (const FunctionType *FTy = dyn_cast<FunctionType>(Ty))
EnumerateParamAttrs(FTy->getParamAttrs());
}
void ValueEnumerator::EnumerateParamAttrs(const ParamAttrsList *PAL) {
if (PAL == 0) return; // null is always 0.
// Do a lookup.
unsigned &Entry = ParamAttrMap[PAL];
if (Entry == 0) {
// Never saw this before, add it.
ParamAttrs.push_back(PAL);
Entry = ParamAttrs.size();
}
}
/// PurgeAggregateValues - If there are any aggregate values at the end of the
/// value list, remove them and return the count of the remaining values. If
/// there are none, return -1.
int ValueEnumerator::PurgeAggregateValues() {
// If there are no aggregate values at the end of the list, return -1.
if (Values.empty() || Values.back().first->getType()->isFirstClassType())
return -1;
// Otherwise, remove aggregate values...
while (!Values.empty() && !Values.back().first->getType()->isFirstClassType())
Values.pop_back();
// ... and return the new size.
return Values.size();
}
void ValueEnumerator::incorporateFunction(const Function &F) {
NumModuleValues = Values.size();
// Adding function arguments to the value table.
for(Function::const_arg_iterator I = F.arg_begin(), E = F.arg_end();
I != E; ++I)
EnumerateValue(I);
FirstFuncConstantID = Values.size();
// Add all function-level constants to the value table.
for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I)
for (User::const_op_iterator OI = I->op_begin(), E = I->op_end();
OI != E; ++OI) {
if ((isa<Constant>(*OI) && !isa<GlobalValue>(*OI)) ||
isa<InlineAsm>(*OI))
EnumerateValue(*OI);
}
BasicBlocks.push_back(BB);
ValueMap[BB] = BasicBlocks.size();
}
FirstInstID = Values.size();
// Add all of the instructions.
for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I) {
if (I->getType() != Type::VoidTy)
EnumerateValue(I);
}
}
}
void ValueEnumerator::purgeFunction() {
/// Remove purged values from the ValueMap.
for (unsigned i = NumModuleValues, e = Values.size(); i != e; ++i)
ValueMap.erase(Values[i].first);
for (unsigned i = 0, e = BasicBlocks.size(); i != e; ++i)
ValueMap.erase(BasicBlocks[i]);
Values.resize(NumModuleValues);
BasicBlocks.clear();
}
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