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[ValueMapper] Add debug output for metadata remapping

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This is useful for debugging which pointers are updated during remapping
process.

Differential Revision: https://reviews.llvm.org/D95775
This commit is contained in:
Ruiling Song 2021-02-01 17:24:12 +08:00
parent 4335051f8d
commit 648b01f347
1 changed files with 24 additions and 5 deletions
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29
lib/Transforms/Utils/ValueMapper.cpp
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@ -26,8 +26,8 @@
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalObject.h"
#include "llvm/IR/GlobalIndirectSymbol.h"
#include "llvm/IR/GlobalObject.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instruction.h"
@ -37,6 +37,7 @@
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
#include <cassert>
#include <limits>
#include <memory>
@ -44,6 +45,8 @@
using namespace llvm;
#define DEBUG_TYPE "value-mapper"
// Out of line method to get vtable etc for class.
void ValueMapTypeRemapper::anchor() {}
void ValueMaterializer::anchor() {}
@ -570,10 +573,18 @@ Optional<Metadata *> MDNodeMapper::tryToMapOperand(const Metadata *Op) {
MDNode *MDNodeMapper::mapDistinctNode(const MDNode &N) {
assert(N.isDistinct() && "Expected a distinct node");
assert(!M.getVM().getMappedMD(&N) && "Expected an unmapped node");
DistinctWorklist.push_back(cast<MDNode>(
(M.Flags & RF_ReuseAndMutateDistinctMDs)
? M.mapToSelf(&N)
: M.mapToMetadata(&N, MDNode::replaceWithDistinct(N.clone()))));
Metadata *NewM = nullptr;
if (M.Flags & RF_ReuseAndMutateDistinctMDs) {
NewM = M.mapToSelf(&N);
} else {
NewM = MDNode::replaceWithDistinct(N.clone());
LLVM_DEBUG(dbgs() << "\nMap " << N << "\n"
<< "To " << *NewM << "\n\n");
M.mapToMetadata(&N, NewM);
}
DistinctWorklist.push_back(cast<MDNode>(NewM));
return DistinctWorklist.back();
}
@ -621,6 +632,9 @@ void MDNodeMapper::remapOperands(MDNode &N, OperandMapper mapOperand) {
for (unsigned I = 0, E = N.getNumOperands(); I != E; ++I) {
Metadata *Old = N.getOperand(I);
Metadata *New = mapOperand(Old);
if (Old != New)
LLVM_DEBUG(dbgs() << "Replacing Op " << Old << " with " << New << " in "
<< N << "\n");
if (Old != New)
N.replaceOperandWith(I, New);
@ -740,6 +754,11 @@ void MDNodeMapper::mapNodesInPOT(UniquedGraph &G) {
});
auto *NewN = MDNode::replaceWithUniqued(std::move(ClonedN));
if (N && NewN && N != NewN) {
LLVM_DEBUG(dbgs() << "\nMap " << *N << "\n"
<< "To " << *NewN << "\n\n");
}
M.mapToMetadata(N, NewN);
// Nodes that were referenced out of order in the POT are involved in a