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-rw-r--r--llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp85
1 files changed, 49 insertions, 36 deletions
diff --git a/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp b/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
index c7138bfbc8b..fe79efce290 100644
--- a/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
+++ b/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
@@ -21,7 +21,6 @@
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
-#include "llvm/IR/AttributeSetNode.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Constant.h"
@@ -173,9 +172,8 @@ bool DeadArgumentEliminationPass::DeleteDeadVarargs(Function &Fn) {
for (unsigned i = 0; PAL.getSlotIndex(i) <= NumArgs; ++i)
AttributesVec.push_back(PAL.getSlotAttributes(i));
if (PAL.hasAttributes(AttributeList::FunctionIndex))
- AttributesVec.push_back(AttributeList::get(Fn.getContext(),
- AttributeList::FunctionIndex,
- PAL.getFnAttributes()));
+ AttributesVec.push_back(
+ AttributeList::get(Fn.getContext(), PAL.getFnAttributes()));
PAL = AttributeList::get(Fn.getContext(), AttributesVec);
}
@@ -686,13 +684,9 @@ bool DeadArgumentEliminationPass::RemoveDeadStuffFromFunction(Function *F) {
bool HasLiveReturnedArg = false;
// Set up to build a new list of parameter attributes.
- SmallVector<AttributeSetNode *, 8> AttributesVec;
+ SmallVector<AttributeList, 8> AttributesVec;
const AttributeList &PAL = F->getAttributes();
- // Reserve an empty slot for the return value attributes, which we will
- // compute last.
- AttributesVec.push_back(nullptr);
-
// Remember which arguments are still alive.
SmallVector<bool, 10> ArgAlive(FTy->getNumParams(), false);
// Construct the new parameter list from non-dead arguments. Also construct
@@ -705,8 +699,16 @@ bool DeadArgumentEliminationPass::RemoveDeadStuffFromFunction(Function *F) {
if (LiveValues.erase(Arg)) {
Params.push_back(I->getType());
ArgAlive[i] = true;
- AttributesVec.push_back(PAL.getParamAttributes(i + 1));
- HasLiveReturnedArg |= PAL.hasAttribute(i + 1, Attribute::Returned);
+
+ // Get the original parameter attributes (skipping the first one, that is
+ // for the return value.
+ if (PAL.hasAttributes(i + 1)) {
+ AttrBuilder B(PAL, i + 1);
+ if (B.contains(Attribute::Returned))
+ HasLiveReturnedArg = true;
+ AttributesVec.push_back(
+ AttributeList::get(F->getContext(), Params.size(), B));
+ }
} else {
++NumArgumentsEliminated;
DEBUG(dbgs() << "DeadArgumentEliminationPass - Removing argument " << i
@@ -780,25 +782,29 @@ bool DeadArgumentEliminationPass::RemoveDeadStuffFromFunction(Function *F) {
assert(NRetTy && "No new return type found?");
// The existing function return attributes.
- AttrBuilder RAttrs(PAL.getRetAttributes());
+ AttributeList RAttrs = PAL.getRetAttributes();
// Remove any incompatible attributes, but only if we removed all return
// values. Otherwise, ensure that we don't have any conflicting attributes
// here. Currently, this should not be possible, but special handling might be
// required when new return value attributes are added.
if (NRetTy->isVoidTy())
- RAttrs.remove(AttributeFuncs::typeIncompatible(NRetTy));
+ RAttrs = RAttrs.removeAttributes(NRetTy->getContext(),
+ AttributeList::ReturnIndex,
+ AttributeFuncs::typeIncompatible(NRetTy));
else
- assert(!RAttrs.overlaps(AttributeFuncs::typeIncompatible(NRetTy)) &&
+ assert(!AttrBuilder(RAttrs, AttributeList::ReturnIndex)
+ .overlaps(AttributeFuncs::typeIncompatible(NRetTy)) &&
"Return attributes no longer compatible?");
- AttributesVec[0] = AttributeSetNode::get(F->getContext(), RAttrs);
+ if (RAttrs.hasAttributes(AttributeList::ReturnIndex))
+ AttributesVec.push_back(AttributeList::get(NRetTy->getContext(), RAttrs));
- // Transfer the function attributes, if any.
- AttributesVec.push_back(PAL.getFnAttributes());
+ if (PAL.hasAttributes(AttributeList::FunctionIndex))
+ AttributesVec.push_back(
+ AttributeList::get(F->getContext(), PAL.getFnAttributes()));
// Reconstruct the AttributesList based on the vector we constructed.
- assert(AttributesVec.size() == Params.size() + 2);
AttributeList NewPAL = AttributeList::get(F->getContext(), AttributesVec);
// Create the new function type based on the recomputed parameters.
@@ -829,11 +835,15 @@ bool DeadArgumentEliminationPass::RemoveDeadStuffFromFunction(Function *F) {
AttributesVec.clear();
const AttributeList &CallPAL = CS.getAttributes();
- // Adjust the call return attributes in case the function was changed to
- // return void.
- AttrBuilder RAttrs(CallPAL.getRetAttributes());
- RAttrs.remove(AttributeFuncs::typeIncompatible(NRetTy));
- AttributesVec.push_back(AttributeSetNode::get(F->getContext(), RAttrs));
+ // The call return attributes.
+ AttributeList RAttrs = CallPAL.getRetAttributes();
+
+ // Adjust in case the function was changed to return void.
+ RAttrs = RAttrs.removeAttributes(
+ NRetTy->getContext(), AttributeList::ReturnIndex,
+ AttributeFuncs::typeIncompatible(NF->getReturnType()));
+ if (RAttrs.hasAttributes(AttributeList::ReturnIndex))
+ AttributesVec.push_back(AttributeList::get(NF->getContext(), RAttrs));
// Declare these outside of the loops, so we can reuse them for the second
// loop, which loops the varargs.
@@ -845,30 +855,33 @@ bool DeadArgumentEliminationPass::RemoveDeadStuffFromFunction(Function *F) {
if (ArgAlive[i]) {
Args.push_back(*I);
// Get original parameter attributes, but skip return attributes.
- AttributeSetNode *Attrs = CallPAL.getParamAttributes(i + 1);
- if (NRetTy != RetTy && Attrs &&
- Attrs->hasAttribute(Attribute::Returned)) {
+ if (CallPAL.hasAttributes(i + 1)) {
+ AttrBuilder B(CallPAL, i + 1);
// If the return type has changed, then get rid of 'returned' on the
// call site. The alternative is to make all 'returned' attributes on
// call sites keep the return value alive just like 'returned'
- // attributes on function declaration but it's less clearly a win and
- // this is not an expected case anyway
- AttributesVec.push_back(AttributeSetNode::get(
- F->getContext(),
- AttrBuilder(Attrs).removeAttribute(Attribute::Returned)));
- } else {
- // Otherwise, use the original attributes.
- AttributesVec.push_back(Attrs);
+ // attributes on function declaration but it's less clearly a win
+ // and this is not an expected case anyway
+ if (NRetTy != RetTy && B.contains(Attribute::Returned))
+ B.removeAttribute(Attribute::Returned);
+ AttributesVec.push_back(
+ AttributeList::get(F->getContext(), Args.size(), B));
}
}
// Push any varargs arguments on the list. Don't forget their attributes.
for (CallSite::arg_iterator E = CS.arg_end(); I != E; ++I, ++i) {
Args.push_back(*I);
- AttributesVec.push_back(CallPAL.getParamAttributes(i + 1));
+ if (CallPAL.hasAttributes(i + 1)) {
+ AttrBuilder B(CallPAL, i + 1);
+ AttributesVec.push_back(
+ AttributeList::get(F->getContext(), Args.size(), B));
+ }
}
- AttributesVec.push_back(CallPAL.getFnAttributes());
+ if (CallPAL.hasAttributes(AttributeList::FunctionIndex))
+ AttributesVec.push_back(
+ AttributeList::get(Call->getContext(), CallPAL.getFnAttributes()));
// Reconstruct the AttributesList based on the vector we constructed.
AttributeList NewCallPAL =
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