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//===-- DebugLoc.cpp - Implement DebugLoc class ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/IntrinsicInst.h"
#include "LLVMContextImpl.h"
#include "llvm/IR/DebugInfo.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// 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 DebugLoc::get(SP->getScopeLine(), 0, SP);
return DebugLoc();
}
DebugLoc DebugLoc::get(unsigned Line, unsigned Col, const MDNode *Scope,
const MDNode *InlinedAt) {
// If no scope is available, this is an unknown location.
if (!Scope)
return DebugLoc();
return DILocation::get(Scope->getContext(), Line, Col,
const_cast<MDNode *>(Scope),
const_cast<MDNode *>(InlinedAt));
}
DebugLoc DebugLoc::appendInlinedAt(DebugLoc DL, DILocation *InlinedAt,
LLVMContext &Ctx,
DenseMap<const MDNode *, MDNode *> &Cache,
bool ReplaceLast) {
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;
}
if (ReplaceLast && !IA->getInlinedAt())
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.
for (const DILocation *MD : reverse(InlinedAtLocations))
Cache[MD] = Last = DILocation::getDistinct(
Ctx, MD->getLine(), MD->getColumn(), MD->getScope(), Last);
return Last;
}
/// Reparent \c Scope from \c OrigSP to \c NewSP.
static DIScope *reparentScope(LLVMContext &Ctx, DIScope *Scope,
DISubprogram *OrigSP, DISubprogram *NewSP,
DenseMap<const MDNode *, MDNode *> &Cache) {
SmallVector<DIScope *, 3> ScopeChain;
DIScope *Last = NewSP;
DIScope *CurScope = Scope;
do {
if (auto *SP = dyn_cast<DISubprogram>(CurScope)) {
// Don't rewrite this scope chain if it doesn't lead to the replaced SP.
if (SP != OrigSP)
return Scope;
Cache.insert({OrigSP, NewSP});
break;
}
if (auto *Found = Cache[CurScope]) {
Last = cast<DIScope>(Found);
break;
}
ScopeChain.push_back(CurScope);
} while ((CurScope = CurScope->getScope().resolve()));
// 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.
for (const DIScope *MD : reverse(ScopeChain)) {
if (auto *LB = dyn_cast<DILexicalBlock>(MD))
Cache[MD] = Last = DILexicalBlock::getDistinct(
Ctx, Last, LB->getFile(), LB->getLine(), LB->getColumn());
else if (auto *LB = dyn_cast<DILexicalBlockFile>(MD))
Cache[MD] = Last = DILexicalBlockFile::getDistinct(
Ctx, Last, LB->getFile(), LB->getDiscriminator());
else
llvm_unreachable("illegal parent scope");
}
return Last;
}
void DebugLoc::reparentDebugInfo(Instruction &I, DISubprogram *OrigSP,
DISubprogram *NewSP,
DenseMap<const MDNode *, MDNode *> &Cache) {
auto DL = I.getDebugLoc();
if (!OrigSP || !NewSP || OrigSP == NewSP || !DL)
return;
// Reparent the debug location.
auto &Ctx = I.getContext();
DILocation *InlinedAt = DL->getInlinedAt();
if (InlinedAt) {
while (auto *IA = InlinedAt->getInlinedAt())
InlinedAt = IA;
auto NewScope =
reparentScope(Ctx, InlinedAt->getScope(), OrigSP, NewSP, Cache);
InlinedAt =
DebugLoc::get(InlinedAt->getLine(), InlinedAt->getColumn(), NewScope);
}
I.setDebugLoc(
DebugLoc::get(DL.getLine(), DL.getCol(),
reparentScope(Ctx, DL->getScope(), OrigSP, NewSP, Cache),
DebugLoc::appendInlinedAt(DL, InlinedAt, Ctx, Cache,
ReplaceLastInlinedAt)));
// Fix up debug variables to point to NewSP.
auto reparentVar = [&](DILocalVariable *Var) {
return DILocalVariable::getDistinct(
Ctx,
cast<DILocalScope>(
reparentScope(Ctx, Var->getScope(), OrigSP, NewSP, Cache)),
Var->getName(), Var->getFile(), Var->getLine(), Var->getType(),
Var->getArg(), Var->getFlags(), Var->getAlignInBits());
};
if (auto *DbgValue = dyn_cast<DbgValueInst>(&I)) {
auto *Var = DbgValue->getVariable();
I.setOperand(2, MetadataAsValue::get(Ctx, reparentVar(Var)));
} else if (auto *DbgDeclare = dyn_cast<DbgDeclareInst>(&I)) {
auto *Var = DbgDeclare->getVariable();
I.setOperand(1, MetadataAsValue::get(Ctx, reparentVar(Var)));
}
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void DebugLoc::dump() const {
if (!Loc)
return;
dbgs() << getLine();
if (getCol() != 0)
dbgs() << ',' << getCol();
if (DebugLoc InlinedAtDL = DebugLoc(getInlinedAt())) {
dbgs() << " @ ";
InlinedAtDL.dump();
} else
dbgs() << "\n";
}
#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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