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Split behavior into two pieces
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9741 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -39,10 +39,6 @@ namespace {
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/// DAE - The dead argument elimination pass.
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///
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class DAE : public Pass {
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/// DeleteFromExternalFunctions - Bugpoint sets this flag to indicate that
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/// it is safe to hack apart functions without internal linkage.
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bool DeleteFromExternalFunctions;
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/// Liveness enum - During our initial pass over the program, we determine
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/// that things are either definately alive, definately dead, or in need of
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/// interprocedural analysis (MaybeLive).
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@ -79,9 +75,10 @@ namespace {
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std::multimap<Function*, CallSite> CallSites;
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public:
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DAE(bool DFEF = false) : DeleteFromExternalFunctions(DFEF) {}
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bool run(Module &M);
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virtual bool ShouldHackArguments() const { return false; }
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private:
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Liveness getArgumentLiveness(const Argument &A);
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bool isMaybeLiveArgumentNowLive(Argument *Arg);
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@ -95,17 +92,20 @@ namespace {
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void RemoveDeadArgumentsFromFunction(Function *F);
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};
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RegisterOpt<DAE> X("deadargelim", "Dead Argument Elimination");
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/// DAH - DeadArgumentHacking pass - Same as dead argument elimination, but
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/// deletes arguments to functions which are external. This is only for use
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/// by bugpoint.
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struct DAH : public DAE {
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virtual bool ShouldHackArguments() const { return true; }
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};
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}
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/// createDeadArgEliminationPass - This pass removes arguments from functions
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/// which are not used by the body of the function. If
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/// DeleteFromExternalFunctions is true, the pass will modify functions that
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/// have external linkage, which is not usually safe (this is used by bugpoint
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/// to reduce testcases).
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/// which are not used by the body of the function.
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///
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Pass *createDeadArgEliminationPass(bool DeleteFromExternalFunctions) {
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return new DAE(DeleteFromExternalFunctions);
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}
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Pass *createDeadArgEliminationPass() { return new DAE(); }
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Pass *createDeadArgHackingPass() { return new DAH(); }
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static inline bool CallPassesValueThoughVararg(Instruction *Call,
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const Value *Arg) {
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@ -163,7 +163,7 @@ void DAE::SurveyFunction(Function &F) {
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bool FunctionIntrinsicallyLive = false;
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Liveness RetValLiveness = F.getReturnType() == Type::VoidTy ? Live : Dead;
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if (!F.hasInternalLinkage() && !DeleteFromExternalFunctions)
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if (!F.hasInternalLinkage() && !ShouldHackArguments())
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FunctionIntrinsicallyLive = true;
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else
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for (Value::use_iterator I = F.use_begin(), E = F.use_end(); I != E; ++I) {
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