//===- DeadTypeElimination.cpp - Eliminate unused types for symbol table --===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// This pass is used to cleanup the output of GCC. It eliminate names for types
//
//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "deadtypeelim"
#include "llvm/Transforms/IPO.h"
#include "llvm/Analysis/FindUsedTypes.h"
#include "llvm/Module.h"
-#include "llvm/SymbolTable.h"
+#include "llvm/TypeSymbolTable.h"
#include "llvm/DerivedTypes.h"
#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/Compiler.h"
using namespace llvm;
+STATISTIC(NumKilled, "Number of unused typenames removed from symtab");
+
namespace {
- struct DTE : public ModulePass {
+ struct VISIBILITY_HIDDEN DTE : public ModulePass {
+ static char ID; // Pass identification, replacement for typeid
+ DTE() : ModulePass((intptr_t)&ID) {}
+
// doPassInitialization - For this pass, it removes global symbol table
// entries for primitive types. These are never used for linking in GCC and
// they make the output uglier to look at, so we nuke them.
AU.addRequired<FindUsedTypes>();
}
};
- RegisterOpt<DTE> X("deadtypeelim", "Dead Type Elimination");
- Statistic<>
- NumKilled("deadtypeelim", "Number of unused typenames removed from symtab");
+ char DTE::ID = 0;
+ RegisterPass<DTE> X("deadtypeelim", "Dead Type Elimination");
}
ModulePass *llvm::createDeadTypeEliminationPass() {
//
static inline bool ShouldNukeSymtabEntry(const Type *Ty){
// Nuke all names for primitive types!
- if (Ty->isPrimitiveType()) return true;
+ if (Ty->isPrimitiveType() || Ty->isInteger())
+ return true;
// Nuke all pointers to primitive types as well...
if (const PointerType *PT = dyn_cast<PointerType>(Ty))
- if (PT->getElementType()->isPrimitiveType()) return true;
+ if (PT->getElementType()->isPrimitiveType() ||
+ PT->getElementType()->isInteger())
+ return true;
return false;
}
bool DTE::runOnModule(Module &M) {
bool Changed = false;
- SymbolTable &ST = M.getSymbolTable();
+ TypeSymbolTable &ST = M.getTypeSymbolTable();
std::set<const Type *> UsedTypes = getAnalysis<FindUsedTypes>().getTypes();
// Check the symbol table for superfluous type entries...
//
// Grab the 'type' plane of the module symbol...
- SymbolTable::type_iterator TI = ST.type_begin();
- while ( TI != ST.type_end() ) {
+ TypeSymbolTable::iterator TI = ST.begin();
+ TypeSymbolTable::iterator TE = ST.end();
+ while ( TI != TE ) {
// If this entry should be unconditionally removed, or if we detect that
// the type is not used, remove it.
const Type *RHS = TI->second;
if (ShouldNukeSymtabEntry(RHS) || !UsedTypes.count(RHS)) {
- SymbolTable::type_iterator ToRemove = TI++;
- ST.remove(ToRemove->second);
+ ST.remove(TI++);
++NumKilled;
Changed = true;
} else {