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Introduce ImmutableCallSite, useful for contexts where no mutation

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is necessary. Inherits from new templated baseclass CallSiteBase<>
which is highly customizable. Base CallSite on it too, in a configuration
that allows full mutation.
Adapt some call sites in analyses to employ ImmutableCallSite.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100100 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gabor Greif
2010-04-01 08:21:08 +00:00
parent 2d7820cb78
commit c8b82ccbcf
6 changed files with 240 additions and 195 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Transforms/IPO/DeadArgumentElimination.cpp
+28 -26
View File
@@ -129,11 +129,11 @@ namespace {
private:
Liveness MarkIfNotLive(RetOrArg Use, UseVector &MaybeLiveUses);
Liveness SurveyUse(Value::use_iterator U, UseVector &MaybeLiveUses,
Liveness SurveyUse(Value::const_use_iterator U, UseVector &MaybeLiveUses,
unsigned RetValNum = 0);
Liveness SurveyUses(Value *V, UseVector &MaybeLiveUses);
Liveness SurveyUses(const Value *V, UseVector &MaybeLiveUses);
void SurveyFunction(Function &F);
void SurveyFunction(const Function &F);
void MarkValue(const RetOrArg &RA, Liveness L,
const UseVector &MaybeLiveUses);
void MarkLive(const RetOrArg &RA);
@@ -310,10 +310,10 @@ DAE::Liveness DAE::MarkIfNotLive(RetOrArg Use, UseVector &MaybeLiveUses) {
/// RetValNum is the return value number to use when this use is used in a
/// return instruction. This is used in the recursion, you should always leave
/// it at 0.
DAE::Liveness DAE::SurveyUse(Value::use_iterator U, UseVector &MaybeLiveUses,
unsigned RetValNum) {
User *V = *U;
if (ReturnInst *RI = dyn_cast<ReturnInst>(V)) {
DAE::Liveness DAE::SurveyUse(Value::const_use_iterator U,
UseVector &MaybeLiveUses, unsigned RetValNum) {
const User *V = *U;
if (const ReturnInst *RI = dyn_cast<ReturnInst>(V)) {
// The value is returned from a function. It's only live when the
// function's return value is live. We use RetValNum here, for the case
// that U is really a use of an insertvalue instruction that uses the
@@ -322,7 +322,7 @@ DAE::Liveness DAE::SurveyUse(Value::use_iterator U, UseVector &MaybeLiveUses,
// We might be live, depending on the liveness of Use.
return MarkIfNotLive(Use, MaybeLiveUses);
}
if (InsertValueInst *IV = dyn_cast<InsertValueInst>(V)) {
if (const InsertValueInst *IV = dyn_cast<InsertValueInst>(V)) {
if (U.getOperandNo() != InsertValueInst::getAggregateOperandIndex()
&& IV->hasIndices())
// The use we are examining is inserted into an aggregate. Our liveness
@@ -334,7 +334,7 @@ DAE::Liveness DAE::SurveyUse(Value::use_iterator U, UseVector &MaybeLiveUses,
// we don't change RetValNum, but do survey all our uses.
Liveness Result = MaybeLive;
for (Value::use_iterator I = IV->use_begin(),
for (Value::const_use_iterator I = IV->use_begin(),
E = V->use_end(); I != E; ++I) {
Result = SurveyUse(I, MaybeLiveUses, RetValNum);
if (Result == Live)
@@ -342,9 +342,9 @@ DAE::Liveness DAE::SurveyUse(Value::use_iterator U, UseVector &MaybeLiveUses,
}
return Result;
}
CallSite CS = CallSite::get(V);
if (CS.getInstruction()) {
Function *F = CS.getCalledFunction();
if (ImmutableCallSite CS = V) {
const Function *F = CS.getCalledFunction();
if (F) {
// Used in a direct call.
@@ -359,7 +359,7 @@ DAE::Liveness DAE::SurveyUse(Value::use_iterator U, UseVector &MaybeLiveUses,
return Live;
assert(CS.getArgument(ArgNo)
== CS.getInstruction()->getOperand(U.getOperandNo())
== CS->getOperand(U.getOperandNo())
&& "Argument is not where we expected it");
// Value passed to a normal call. It's only live when the corresponding
@@ -378,11 +378,11 @@ DAE::Liveness DAE::SurveyUse(Value::use_iterator U, UseVector &MaybeLiveUses,
/// Adds all uses that cause the result to be MaybeLive to MaybeLiveRetUses. If
/// the result is Live, MaybeLiveUses might be modified but its content should
/// be ignored (since it might not be complete).
DAE::Liveness DAE::SurveyUses(Value *V, UseVector &MaybeLiveUses) {
DAE::Liveness DAE::SurveyUses(const Value *V, UseVector &MaybeLiveUses) {
// Assume it's dead (which will only hold if there are no uses at all..).
Liveness Result = MaybeLive;
// Check each use.
for (Value::use_iterator I = V->use_begin(),
for (Value::const_use_iterator I = V->use_begin(),
E = V->use_end(); I != E; ++I) {
Result = SurveyUse(I, MaybeLiveUses);
if (Result == Live)
@@ -399,7 +399,7 @@ DAE::Liveness DAE::SurveyUses(Value *V, UseVector &MaybeLiveUses) {
// We consider arguments of non-internal functions to be intrinsically alive as
// well as arguments to functions which have their "address taken".
//
void DAE::SurveyFunction(Function &F) {
void DAE::SurveyFunction(const Function &F) {
unsigned RetCount = NumRetVals(&F);
// Assume all return values are dead
typedef SmallVector<Liveness, 5> RetVals;
@@ -411,8 +411,8 @@ void DAE::SurveyFunction(Function &F) {
// MaybeLive. Initialized to a list of RetCount empty lists.
RetUses MaybeLiveRetUses(RetCount);
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
if (ReturnInst *RI = dyn_cast<ReturnInst>(BB->getTerminator()))
for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
if (const ReturnInst *RI = dyn_cast<ReturnInst>(BB->getTerminator()))
if (RI->getNumOperands() != 0 && RI->getOperand(0)->getType()
!= F.getFunctionType()->getReturnType()) {
// We don't support old style multiple return values.
@@ -431,17 +431,18 @@ void DAE::SurveyFunction(Function &F) {
unsigned NumLiveRetVals = 0;
const Type *STy = dyn_cast<StructType>(F.getReturnType());
// Loop all uses of the function.
for (Value::use_iterator I = F.use_begin(), E = F.use_end(); I != E; ++I) {
for (Value::const_use_iterator I = F.use_begin(), E = F.use_end();
I != E; ++I) {
// If the function is PASSED IN as an argument, its address has been
// taken.
CallSite CS = CallSite::get(*I);
if (!CS.getInstruction() || !CS.isCallee(I)) {
ImmutableCallSite CS(*I);
if (!CS || !CS.isCallee(I)) {
MarkLive(F);
return;
}
// If this use is anything other than a call site, the function is alive.
Instruction *TheCall = CS.getInstruction();
const Instruction *TheCall = CS.getInstruction();
if (!TheCall) { // Not a direct call site?
MarkLive(F);
return;
@@ -454,9 +455,9 @@ void DAE::SurveyFunction(Function &F) {
if (NumLiveRetVals != RetCount) {
if (STy) {
// Check all uses of the return value.
for (Value::use_iterator I = TheCall->use_begin(),
for (Value::const_use_iterator I = TheCall->use_begin(),
E = TheCall->use_end(); I != E; ++I) {
ExtractValueInst *Ext = dyn_cast<ExtractValueInst>(*I);
const ExtractValueInst *Ext = dyn_cast<ExtractValueInst>(*I);
if (Ext && Ext->hasIndices()) {
// This use uses a part of our return value, survey the uses of
// that part and store the results for this index only.
@@ -493,7 +494,7 @@ void DAE::SurveyFunction(Function &F) {
// Now, check all of our arguments.
unsigned i = 0;
UseVector MaybeLiveArgUses;
for (Function::arg_iterator AI = F.arg_begin(),
for (Function::const_arg_iterator AI = F.arg_begin(),
E = F.arg_end(); AI != E; ++AI, ++i) {
// See what the effect of this use is (recording any uses that cause
// MaybeLive in MaybeLiveArgUses).
@@ -690,7 +691,8 @@ bool DAE::RemoveDeadStuffFromFunction(Function *F) {
AttributesVec.push_back(AttributeWithIndex::get(~0, FnAttrs));
// Reconstruct the AttributesList based on the vector we constructed.
AttrListPtr NewPAL = AttrListPtr::get(AttributesVec.begin(), AttributesVec.end());
AttrListPtr NewPAL = AttrListPtr::get(AttributesVec.begin(),
AttributesVec.end());
// Work around LLVM bug PR56: the CWriter cannot emit varargs functions which
// have zero fixed arguments.