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Split behavior into two pieces 

llvm-svn: 9741
This commit is contained in:
Chris Lattner 2003-11-05 21:43:02 +00:00
parent debac38f5e
commit 9e60aced2e
1 changed files with 13 additions and 13 deletions
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26
llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
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@ -39,10 +39,6 @@ namespace {
/// DAE - The dead argument elimination pass.
///
class DAE : public Pass {
/// DeleteFromExternalFunctions - Bugpoint sets this flag to indicate that
/// it is safe to hack apart functions without internal linkage.
bool DeleteFromExternalFunctions;
/// Liveness enum - During our initial pass over the program, we determine
/// that things are either definately alive, definately dead, or in need of
/// interprocedural analysis (MaybeLive).
@ -79,9 +75,10 @@ namespace {
std::multimap<Function*, CallSite> CallSites;
public:
DAE(bool DFEF = false) : DeleteFromExternalFunctions(DFEF) {}
bool run(Module &M);
virtual bool ShouldHackArguments() const { return false; }
private:
Liveness getArgumentLiveness(const Argument &A);
bool isMaybeLiveArgumentNowLive(Argument *Arg);
@ -95,17 +92,20 @@ namespace {
void RemoveDeadArgumentsFromFunction(Function *F);
};
RegisterOpt<DAE> X("deadargelim", "Dead Argument Elimination");
/// DAH - DeadArgumentHacking pass - Same as dead argument elimination, but
/// deletes arguments to functions which are external. This is only for use
/// by bugpoint.
struct DAH : public DAE {
virtual bool ShouldHackArguments() const { return true; }
};
}
/// createDeadArgEliminationPass - This pass removes arguments from functions
/// which are not used by the body of the function. If
/// DeleteFromExternalFunctions is true, the pass will modify functions that
/// have external linkage, which is not usually safe (this is used by bugpoint
/// to reduce testcases).
/// which are not used by the body of the function.
///
Pass *createDeadArgEliminationPass(bool DeleteFromExternalFunctions) {
return new DAE(DeleteFromExternalFunctions);
}
Pass *createDeadArgEliminationPass() { return new DAE(); }
Pass *createDeadArgHackingPass() { return new DAH(); }
static inline bool CallPassesValueThoughVararg(Instruction *Call,
const Value *Arg) {
@ -163,7 +163,7 @@ void DAE::SurveyFunction(Function &F) {
bool FunctionIntrinsicallyLive = false;
Liveness RetValLiveness = F.getReturnType() == Type::VoidTy ? Live : Dead;
if (!F.hasInternalLinkage() && !DeleteFromExternalFunctions)
if (!F.hasInternalLinkage() && !ShouldHackArguments())
FunctionIntrinsicallyLive = true;
else
for (Value::use_iterator I = F.use_begin(), E = F.use_end(); I != E; ++I) {