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IR: Add MDLocation class

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Add a new subclass of `UniquableMDNode`, `MDLocation`.  This will be the
IR version of `DebugLoc` and `DILocation`.  The goal is to rename this
to `DILocation` once the IR classes supersede the `DI`-prefixed
wrappers.

This isn't used anywhere yet.  Part of PR21433.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225824 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-01-13 20:44:56 +00:00
parent 9e495c518c
commit d640962656
7 changed files with 266 additions and 4 deletions
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93
lib/IR/Metadata.cpp
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@ -640,6 +640,93 @@ MDTuple *MDTuple::uniquifyImpl() {
void MDTuple::eraseFromStoreImpl() { getContext().pImpl->MDTuples.erase(this); }
MDLocation::MDLocation(LLVMContext &C, unsigned Line, unsigned Column,
ArrayRef<Metadata *> MDs, bool AllowRAUW)
: UniquableMDNode(C, MDLocationKind, MDs, AllowRAUW) {
assert((MDs.size() == 1 || MDs.size() == 2) &&
"Expected a scope and optional inlined-at");
// Set line and column.
assert(Line < (1u << 24) && "Expected 24-bit line");
assert(Column < (1u << 8) && "Expected 8-bit column");
MDNodeSubclassData = Line;
SubclassData16 = Column;
}
MDLocation *MDLocation::constructHelper(LLVMContext &Context, unsigned Line,
unsigned Column, Metadata *Scope,
Metadata *InlinedAt, bool AllowRAUW) {
SmallVector<Metadata *, 2> Ops;
Ops.push_back(Scope);
if (InlinedAt)
Ops.push_back(InlinedAt);
return new (Ops.size()) MDLocation(Context, Line, Column, Ops, AllowRAUW);
}
static void adjustLine(unsigned &Line) {
// Set to unknown on overflow. Still use 24 bits for now.
if (Line >= (1u << 24))
Line = 0;
}
static void adjustColumn(unsigned &Column) {
// Set to unknown on overflow. Still use 8 bits for now.
if (Column >= (1u << 8))
Column = 0;
}
MDLocation *MDLocation::getImpl(LLVMContext &Context, unsigned Line,
unsigned Column, Metadata *Scope,
Metadata *InlinedAt, bool ShouldCreate) {
// Fixup line/column.
adjustLine(Line);
adjustColumn(Column);
MDLocationInfo::KeyTy Key(Line, Column, Scope, InlinedAt);
auto &Store = Context.pImpl->MDLocations;
auto I = Store.find_as(Key);
if (I != Store.end())
return *I;
if (!ShouldCreate)
return nullptr;
auto *N = constructHelper(Context, Line, Column, Scope, InlinedAt,
/* AllowRAUW */ true);
Store.insert(N);
return N;
}
MDLocation *MDLocation::getDistinct(LLVMContext &Context, unsigned Line,
unsigned Column, Metadata *Scope,
Metadata *InlinedAt) {
// Fixup line/column.
adjustLine(Line);
adjustColumn(Column);
auto *N = constructHelper(Context, Line, Column, Scope, InlinedAt,
/* AllowRAUW */ false);
N->storeDistinctInContext();
return N;
}
MDLocation *MDLocation::uniquifyImpl() {
MDLocationInfo::KeyTy Key(this);
auto &Store = getContext().pImpl->MDLocations;
auto I = Store.find_as(Key);
if (I == Store.end()) {
Store.insert(this);
return this;
}
return *I;
}
void MDLocation::eraseFromStoreImpl() {
getContext().pImpl->MDLocations.erase(this);
}
MDNodeFwdDecl *MDNode::getTemporary(LLVMContext &Context,
ArrayRef<Metadata *> MDs) {
return MDNodeFwdDecl::get(Context, MDs);
@ -650,9 +737,9 @@ void MDNode::deleteTemporary(MDNode *N) { delete cast<MDNodeFwdDecl>(N); }
void UniquableMDNode::storeDistinctInContext() {
assert(!IsDistinctInContext && "Expected newly distinct metadata");
IsDistinctInContext = true;
auto *T = cast<MDTuple>(this);
T->setHash(0);
getContext().pImpl->DistinctMDNodes.insert(T);
if (auto *T = dyn_cast<MDTuple>(this))
T->setHash(0);
getContext().pImpl->DistinctMDNodes.insert(this);
}
void MDNode::replaceOperandWith(unsigned I, Metadata *New) {