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Cleanup and simplify code

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3036 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-07-23 22:03:41 +00:00
parent 9cfea85b8b
commit 7311e389a6
1 changed files with 22 additions and 59 deletions
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81
lib/Transforms/IPO/DeadTypeElimination.cpp
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@ -1,58 +1,41 @@
//===- CleanupGCCOutput.cpp - Cleanup GCC Output --------------------------===//
//===- DeadTypeElimination.cpp - Eliminate unused types for symbol table --===//
//
// This pass is used to cleanup the output of GCC. GCC's output is
// unneccessarily gross for a couple of reasons. This pass does the following
// things to try to clean it up:
//
// * Eliminate names for GCC types that we know can't be needed by the user.
// * Eliminate names for types that are unused in the entire translation unit
// * Fix various problems that we might have in PHI nodes and casts
//
// Note: This code produces dead declarations, it is a good idea to run DCE
// after this pass.
// This pass is used to cleanup the output of GCC. It eliminate names for types
// that are unused in the entire translation unit, using the FindUsedTypes pass.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/CleanupGCCOutput.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Analysis/FindUsedTypes.h"
#include "llvm/Module.h"
#include "llvm/SymbolTable.h"
#include "llvm/DerivedTypes.h"
#include "Support/StatisticReporter.h"
static Statistic<> NumTypeSymtabEntriesKilled("cleangcc\t- Number of unused typenames removed from symtab");
using std::vector;
namespace {
struct CleanupGCCOutput : public FunctionPass {
struct DTE : public Pass {
// 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.
//
// Also, initialize instance variables.
//
bool doInitialization(Module &M);
bool run(Module &M);
// FIXME:
// FIXME: This FunctionPass should be a PASS!
// FIXME:
bool runOnFunction(Function &F) { return false; }
// doPassFinalization - Strip out type names that are unused by the program
bool doFinalization(Module &M);
// getAnalysisUsage - This function needs FindUsedTypes to do its job...
//
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired(FindUsedTypes::ID);
}
};
RegisterPass<CleanupGCCOutput> X("cleangcc", "Cleanup GCC Output");
RegisterPass<DTE> X("deadtypeelim", "Dead Type Elimination");
Statistic<> NumKilled("deadtypeelim\t- Number of unused typenames removed from symtab");
}
Pass *createCleanupGCCOutputPass() {
return new CleanupGCCOutput();
Pass *createDeadTypeEliminationPass() {
return new DTE();
}
@ -71,14 +54,18 @@ static inline bool ShouldNukeSymtabEntry(const std::pair<std::string,Value*>&E){
return false;
}
// doInitialization - 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.
// run - 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. Also eliminate types that are never used
// in the entire program as indicated by FindUsedTypes.
//
bool CleanupGCCOutput::doInitialization(Module &M) {
bool DTE::run(Module &M) {
bool Changed = false;
if (SymbolTable *ST = M.getSymbolTable()) {
const std::set<const Type *> &UsedTypes =
getAnalysis<FindUsedTypes>().getTypes();
// Check the symbol table for superfluous type entries...
//
// Grab the 'type' plane of the module symbol...
@ -94,46 +81,22 @@ bool CleanupGCCOutput::doInitialization(Module &M) {
Plane.erase(PI); // Alas, GCC 2.95.3 doesn't *SIGH*
PI = Plane.begin();
#endif
++NumTypeSymtabEntriesKilled;
++NumKilled;
Changed = true;
} else {
++PI;
}
}
}
return Changed;
}
bool CleanupGCCOutput::doFinalization(Module &M) {
bool Changed = false;
if (SymbolTable *ST = M.getSymbolTable()) {
const std::set<const Type *> &UsedTypes =
getAnalysis<FindUsedTypes>().getTypes();
// Check the symbol table for superfluous type entries that aren't used in
// the program
//
// Grab the 'type' plane of the module symbol...
SymbolTable::iterator STI = ST->find(Type::TypeTy);
if (STI != ST->end()) {
// Loop over all entries in the type plane...
SymbolTable::VarMap &Plane = STI->second;
for (SymbolTable::VarMap::iterator PI = Plane.begin(); PI != Plane.end();)
if (!UsedTypes.count(cast<Type>(PI->second))) {
} else if (!UsedTypes.count(cast<Type>(PI->second))) {
#if MAP_IS_NOT_BRAINDEAD
PI = Plane.erase(PI); // STD C++ Map should support this!
#else
Plane.erase(PI); // Alas, GCC 2.95.3 doesn't *SIGH*
PI = Plane.begin(); // N^2 algorithms are fun. :(
#endif
++NumKilled;
Changed = true;
} else {
++PI;
}
}
}
return Changed;
}