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-rw-r--r--llvm/lib/Transforms/InstCombine/InstCombineInternal.h6
-rw-r--r--llvm/lib/Transforms/Utils/Local.cpp103
2 files changed, 35 insertions, 74 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
index 0a3382e1903..0d76cdf371e 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
@@ -28,9 +28,6 @@
#include "llvm/IR/PatternMatch.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/InstCombine/InstCombineWorklist.h"
-#include "llvm/Transforms/Utils/Local.h"
-#include "llvm/Support/Dwarf.h"
-#include "llvm/IR/DIBuilder.h"
#define DEBUG_TYPE "instcombine"
@@ -473,9 +470,8 @@ public:
/// methods should return the value returned by this function.
Instruction *eraseInstFromFunction(Instruction &I) {
DEBUG(dbgs() << "IC: ERASE " << I << '\n');
- assert(I.use_empty() && "Cannot erase instruction that is used!");
- salvageDebugInfo(I);
+ assert(I.use_empty() && "Cannot erase instruction that is used!");
// Make sure that we reprocess all operands now that we reduced their
// use counts.
if (I.getNumOperands() < 8) {
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 431055233e9..acbc131118f 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -1085,14 +1085,15 @@ static bool PhiHasDebugValue(DILocalVariable *DIVar,
// Since we can't guarantee that the original dbg.declare instrinsic
// is removed by LowerDbgDeclare(), we need to make sure that we are
// not inserting the same dbg.value intrinsic over and over.
- bool Found = false;
- findDbgValues(APN, [&](DbgValueInst &DVI) {
- assert(DVI.getValue() == APN);
- assert(DVI.getOffset() == 0);
- if ((DVI.getVariable() == DIVar) && (DVI.getExpression() == DIExpr))
- Found = true;
- });
- return Found;
+ SmallVector<DbgValueInst *, 1> DbgValues;
+ findDbgValues(DbgValues, APN);
+ for (auto *DVI : DbgValues) {
+ assert(DVI->getValue() == APN);
+ assert(DVI->getOffset() == 0);
+ if ((DVI->getVariable() == DIVar) && (DVI->getExpression() == DIExpr))
+ return true;
+ }
+ return false;
}
/// Inserts a llvm.dbg.value intrinsic before a store to an alloca'd value
@@ -1250,40 +1251,44 @@ DbgDeclareInst *llvm::FindAllocaDbgDeclare(Value *V) {
return nullptr;
}
-void llvm::findDbgValues(Value *V, std::function<void(DbgValueInst &)> Action) {
+void llvm::findDbgValues(SmallVectorImpl<DbgValueInst *> &DbgValues, Value *V) {
if (auto *L = LocalAsMetadata::getIfExists(V))
if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), L))
for (User *U : MDV->users())
if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(U))
- Action(*DVI);
+ DbgValues.push_back(DVI);
+}
+
+static void DIExprAddDeref(SmallVectorImpl<uint64_t> &Expr) {
+ Expr.push_back(dwarf::DW_OP_deref);
}
-static void appendOffset(SmallVectorImpl<uint64_t> &Ops, int64_t Offset) {
+static void DIExprAddOffset(SmallVectorImpl<uint64_t> &Expr, int Offset) {
if (Offset > 0) {
- Ops.push_back(dwarf::DW_OP_plus);
- Ops.push_back(Offset);
+ Expr.push_back(dwarf::DW_OP_plus);
+ Expr.push_back(Offset);
} else if (Offset < 0) {
- Ops.push_back(dwarf::DW_OP_minus);
- Ops.push_back(-Offset);
+ Expr.push_back(dwarf::DW_OP_minus);
+ Expr.push_back(-Offset);
}
}
-/// Prepend \p DIExpr with a deref and offset operation.
-static DIExpression *prependDIExpr(DIBuilder &Builder, DIExpression *DIExpr,
- bool Deref, int64_t Offset) {
+static DIExpression *BuildReplacementDIExpr(DIBuilder &Builder,
+ DIExpression *DIExpr, bool Deref,
+ int Offset) {
if (!Deref && !Offset)
return DIExpr;
// Create a copy of the original DIDescriptor for user variable, prepending
// "deref" operation to a list of address elements, as new llvm.dbg.declare
// will take a value storing address of the memory for variable, not
// alloca itself.
- SmallVector<uint64_t, 4> Ops;
+ SmallVector<uint64_t, 4> NewDIExpr;
if (Deref)
- Ops.push_back(dwarf::DW_OP_deref);
- appendOffset(Ops, Offset);
+ DIExprAddDeref(NewDIExpr);
+ DIExprAddOffset(NewDIExpr, Offset);
if (DIExpr)
- Ops.append(DIExpr->elements_begin(), DIExpr->elements_end());
- return Builder.createExpression(Ops);
+ NewDIExpr.append(DIExpr->elements_begin(), DIExpr->elements_end());
+ return Builder.createExpression(NewDIExpr);
}
bool llvm::replaceDbgDeclare(Value *Address, Value *NewAddress,
@@ -1297,7 +1302,7 @@ bool llvm::replaceDbgDeclare(Value *Address, Value *NewAddress,
auto *DIExpr = DDI->getExpression();
assert(DIVar && "Missing variable");
- DIExpr = prependDIExpr(Builder, DIExpr, Deref, Offset);
+ DIExpr = BuildReplacementDIExpr(Builder, DIExpr, Deref, Offset);
// Insert llvm.dbg.declare immediately after the original alloca, and remove
// old llvm.dbg.declare.
@@ -1329,11 +1334,11 @@ static void replaceOneDbgValueForAlloca(DbgValueInst *DVI, Value *NewAddress,
// Insert the offset immediately after the first deref.
// We could just change the offset argument of dbg.value, but it's unsigned...
if (Offset) {
- SmallVector<uint64_t, 4> Ops;
- Ops.push_back(dwarf::DW_OP_deref);
- appendOffset(Ops, Offset);
- Ops.append(DIExpr->elements_begin() + 1, DIExpr->elements_end());
- DIExpr = Builder.createExpression(Ops);
+ SmallVector<uint64_t, 4> NewDIExpr;
+ DIExprAddDeref(NewDIExpr);
+ DIExprAddOffset(NewDIExpr, Offset);
+ NewDIExpr.append(DIExpr->elements_begin() + 1, DIExpr->elements_end());
+ DIExpr = Builder.createExpression(NewDIExpr);
}
Builder.insertDbgValueIntrinsic(NewAddress, DVI->getOffset(), DIVar, DIExpr,
@@ -1352,46 +1357,6 @@ void llvm::replaceDbgValueForAlloca(AllocaInst *AI, Value *NewAllocaAddress,
}
}
-void llvm::salvageDebugInfo(Instruction &I) {
- auto MDWrap = [&](Value *V) {
- return MetadataAsValue::get(I.getContext(), ValueAsMetadata::get(V));
- };
- auto &M = *I.getModule();
- if (auto *BitCast = dyn_cast<BitCastInst>(&I))
- findDbgValues(BitCast, [&](DbgValueInst &DVI) {
- // Bitcasts are entirely irrelevant for debug info. Rewrite the dbg.value
- // to use the cast's source.
- DVI.setOperand(0, MDWrap(I.getOperand(0)));
- DEBUG(dbgs() << "SALVAGE: " << DVI << '\n');
- });
- else if (auto *GEP = dyn_cast<GetElementPtrInst>(&I))
- findDbgValues(GEP, [&](DbgValueInst &DVI) {
- unsigned BitWidth =
- M.getDataLayout().getPointerSizeInBits(GEP->getPointerAddressSpace());
- APInt Offset(BitWidth, 0);
- // Rewrite a constant GEP into a DIExpression.
- if (GEP->accumulateConstantOffset(M.getDataLayout(), Offset)) {
- auto *DIExpr = DVI.getExpression();
- DIBuilder DIB(M, /*AllowUnresolved*/ false);
- // GEP offsets are i32 and thus alwaus fit into an int64_t.
- DIExpr = prependDIExpr(DIB, DIExpr, NoDeref, Offset.getSExtValue());
- DVI.setOperand(0, MDWrap(I.getOperand(0)));
- DVI.setOperand(3, MetadataAsValue::get(I.getContext(), DIExpr));
- DEBUG(dbgs() << "SALVAGE: " << DVI << '\n');
- }
- });
- else if (auto *Load = dyn_cast<LoadInst>(&I))
- findDbgValues(Load, [&](DbgValueInst &DVI) {
- // Rewrite the load into DW_OP_deref.
- auto *DIExpr = DVI.getExpression();
- DIBuilder DIB(M, /*AllowUnresolved*/ false);
- DIExpr = prependDIExpr(DIB, DIExpr, WithDeref, 0);
- DVI.setOperand(0, MDWrap(I.getOperand(0)));
- DVI.setOperand(3, MetadataAsValue::get(I.getContext(), DIExpr));
- DEBUG(dbgs() << "SALVAGE: " << DVI << '\n');
- });
-}
-
unsigned llvm::removeAllNonTerminatorAndEHPadInstructions(BasicBlock *BB) {
unsigned NumDeadInst = 0;
// Delete the instructions backwards, as it has a reduced likelihood of
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