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//===-- DebugLoc.cpp - Implement DebugLoc class ---------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/DebugLoc.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/DebugInfo.h"
#if LLVM_ENABLE_DEBUGLOC_TRACKING_ORIGIN
#include "llvm/Support/Signals.h"
namespace llvm {
DbgLocOrigin::DbgLocOrigin(bool ShouldCollectTrace) {
if (!ShouldCollectTrace)
return;
auto &[Depth, StackTrace] = StackTraces.emplace_back();
Depth = sys::getStackTrace(StackTrace);
}
void DbgLocOrigin::addTrace() {
// We only want to add new stacktraces if we already have one: addTrace exists
// to provide more context to how missing DebugLocs have propagated through
// the program, but by design if there is no existing stacktrace then we have
// decided not to track this DebugLoc as being "missing".
if (StackTraces.empty())
return;
auto &[Depth, StackTrace] = StackTraces.emplace_back();
Depth = sys::getStackTrace(StackTrace);
}
} // namespace llvm
#endif
using namespace llvm;
#if LLVM_ENABLE_DEBUGLOC_TRACKING_COVERAGE
DILocAndCoverageTracking::DILocAndCoverageTracking(const DILocation *L)
: TrackingMDNodeRef(const_cast<DILocation *>(L)), DbgLocOrigin(!L),
Kind(DebugLocKind::Normal) {}
#endif // LLVM_ENABLE_DEBUGLOC_TRACKING_COVERAGE
//===----------------------------------------------------------------------===//
// DebugLoc Implementation
//===----------------------------------------------------------------------===//
DebugLoc::DebugLoc(const DILocation *L) : Loc(const_cast<DILocation *>(L)) {}
DebugLoc::DebugLoc(const MDNode *L) : Loc(const_cast<MDNode *>(L)) {}
DILocation *DebugLoc::get() const {
return cast_or_null<DILocation>(Loc.get());
}
unsigned DebugLoc::getLine() const {
assert(get() && "Expected valid DebugLoc");
return get()->getLine();
}
unsigned DebugLoc::getCol() const {
assert(get() && "Expected valid DebugLoc");
return get()->getColumn();
}
MDNode *DebugLoc::getScope() const {
assert(get() && "Expected valid DebugLoc");
return get()->getScope();
}
DILocation *DebugLoc::getInlinedAt() const {
assert(get() && "Expected valid DebugLoc");
return get()->getInlinedAt();
}
MDNode *DebugLoc::getInlinedAtScope() const {
return cast<DILocation>(Loc)->getInlinedAtScope();
}
DebugLoc DebugLoc::getFnDebugLoc() const {
// FIXME: Add a method on \a DILocation that does this work.
const MDNode *Scope = getInlinedAtScope();
if (auto *SP = getDISubprogram(Scope))
return DILocation::get(SP->getContext(), SP->getScopeLine(), 0, SP);
return DebugLoc();
}
bool DebugLoc::isImplicitCode() const {
if (DILocation *Loc = get()) {
return Loc->isImplicitCode();
}
return true;
}
void DebugLoc::setImplicitCode(bool ImplicitCode) {
if (DILocation *Loc = get()) {
Loc->setImplicitCode(ImplicitCode);
}
}
DebugLoc DebugLoc::replaceInlinedAtSubprogram(
const DebugLoc &RootLoc, DISubprogram &NewSP, LLVMContext &Ctx,
DenseMap<const MDNode *, MDNode *> &Cache) {
SmallVector<DILocation *> LocChain;
DILocation *CachedResult = nullptr;
// Collect the inline chain, stopping if we find a location that has already
// been processed.
for (DILocation *Loc = RootLoc; Loc; Loc = Loc->getInlinedAt()) {
if (auto It = Cache.find(Loc); It != Cache.end()) {
CachedResult = cast<DILocation>(It->second);
break;
}
LocChain.push_back(Loc);
}
DILocation *UpdatedLoc = CachedResult;
if (!UpdatedLoc) {
// If no cache hits, then back() is the end of the inline chain, that is,
// the DILocation whose scope ends in the Subprogram to be replaced.
DILocation *LocToUpdate = LocChain.pop_back_val();
DIScope *NewScope = DILocalScope::cloneScopeForSubprogram(
*LocToUpdate->getScope(), NewSP, Ctx, Cache);
UpdatedLoc = DILocation::get(Ctx, LocToUpdate->getLine(),
LocToUpdate->getColumn(), NewScope);
Cache[LocToUpdate] = UpdatedLoc;
}
// Recreate the location chain, bottom-up, starting at the new scope (or a
// cached result).
for (const DILocation *LocToUpdate : reverse(LocChain)) {
UpdatedLoc =
DILocation::get(Ctx, LocToUpdate->getLine(), LocToUpdate->getColumn(),
LocToUpdate->getScope(), UpdatedLoc);
Cache[LocToUpdate] = UpdatedLoc;
}
return UpdatedLoc;
}
DebugLoc DebugLoc::appendInlinedAt(const DebugLoc &DL, DILocation *InlinedAt,
LLVMContext &Ctx,
DenseMap<const MDNode *, MDNode *> &Cache) {
SmallVector<DILocation *, 3> InlinedAtLocations;
DILocation *Last = InlinedAt;
DILocation *CurInlinedAt = DL;
// Gather all the inlined-at nodes.
while (DILocation *IA = CurInlinedAt->getInlinedAt()) {
// Skip any we've already built nodes for.
if (auto *Found = Cache[IA]) {
Last = cast<DILocation>(Found);
break;
}
InlinedAtLocations.push_back(IA);
CurInlinedAt = IA;
}
// Starting from the top, rebuild the nodes to point to the new inlined-at
// location (then rebuilding the rest of the chain behind it) and update the
// map of already-constructed inlined-at nodes.
// Key Instructions: InlinedAt fields don't need atom info.
for (const DILocation *MD : reverse(InlinedAtLocations))
Cache[MD] = Last = DILocation::getDistinct(
Ctx, MD->getLine(), MD->getColumn(), MD->getScope(), Last);
return Last;
}
DebugLoc DebugLoc::getMergedLocations(ArrayRef<DebugLoc> Locs) {
if (Locs.empty())
return DebugLoc();
if (Locs.size() == 1)
return Locs[0];
DebugLoc Merged = Locs[0];
for (const DebugLoc &DL : llvm::drop_begin(Locs)) {
Merged = getMergedLocation(Merged, DL);
if (!Merged)
break;
}
return Merged;
}
DebugLoc DebugLoc::getMergedLocation(DebugLoc LocA, DebugLoc LocB) {
if (!LocA)
return LocA;
if (!LocB)
return LocB;
return DILocation::getMergedLocation(LocA, LocB);
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void DebugLoc::dump() const { print(dbgs()); }
#endif
void DebugLoc::print(raw_ostream &OS) const {
if (!Loc)
return;
// Print source line info.
auto *Scope = cast<DIScope>(getScope());
OS << Scope->getFilename();
OS << ':' << getLine();
if (getCol() != 0)
OS << ':' << getCol();
if (DebugLoc InlinedAtDL = getInlinedAt()) {
OS << " @[ ";
InlinedAtDL.print(OS);
OS << " ]";
}
}
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