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AsmPrinter: Calculate type upfront for location lists, NFC

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We can calculate the variable type up front before calling
`DebugLocEntry::finalize()`.  In fact, since we only care about the type
if it's an `MDBasicType`, don't even bother resolving it using the type
identifier map.

llvm-svn: 235201
This commit is contained in:
Duncan P. N. Exon Smith 2015-04-17 16:28:58 +00:00
parent 03f76e09ca
commit 8710293596
2 changed files with 15 additions and 15 deletions
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3
lib/CodeGen/AsmPrinter/DebugLocEntry.h
View File

@ -153,8 +153,7 @@ public:
}
/// \brief Lower this entry into a DWARF expression.
void finalize(const AsmPrinter &AP,
const DITypeIdentifierMap &TypeIdentifierMap);
void finalize(const AsmPrinter &AP, const MDBasicType *TypeIdentifierMap);
/// \brief Return the lowered DWARF expression.
StringRef getDWARFBytes() const { return DWARFBytes; }

27
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -921,9 +921,16 @@ void DwarfDebug::collectVariableInfo(DwarfCompileUnit &TheCU, DISubprogram SP,
// Build the location list for this variable.
buildLocationList(LocList.List, Ranges);
// If the variable has an MDBasicType, extract it. Basic types cannot have
// unique identifiers, so don't bother resolving the type with the
// identifier map.
const MDBasicType *BT = dyn_cast<MDBasicType>(
static_cast<const Metadata *>(IV.first->getType()));
// Finalize the entry by lowering it into a DWARF bytestream.
for (auto &Entry : LocList.List)
Entry.finalize(*Asm, TypeIdentifierMap);
Entry.finalize(*Asm, BT);
}
// Collect info for variables that were optimized out.
@ -1469,21 +1476,17 @@ void DwarfDebug::emitDebugLocEntry(ByteStreamer &Streamer,
Streamer.EmitInt8(Byte, Comment != End ? *(Comment++) : "");
}
static void emitDebugLocValue(const AsmPrinter &AP,
const DITypeIdentifierMap &TypeIdentifierMap,
static void emitDebugLocValue(const AsmPrinter &AP, const MDBasicType *BT,
ByteStreamer &Streamer,
const DebugLocEntry::Value &Value,
unsigned PieceOffsetInBits) {
DIVariable DV = Value.getVariable();
DebugLocDwarfExpression DwarfExpr(*AP.MF->getSubtarget().getRegisterInfo(),
AP.getDwarfDebug()->getDwarfVersion(),
Streamer);
// Regular entry.
if (Value.isInt()) {
MDType *T = DV->getType().resolve(TypeIdentifierMap);
auto *B = dyn_cast<MDBasicType>(T);
if (B && (B->getEncoding() == dwarf::DW_ATE_signed ||
B->getEncoding() == dwarf::DW_ATE_signed_char))
if (BT && (BT->getEncoding() == dwarf::DW_ATE_signed ||
BT->getEncoding() == dwarf::DW_ATE_signed_char))
DwarfExpr.AddSignedConstant(Value.getInt());
else
DwarfExpr.AddUnsignedConstant(Value.getInt());
@ -1509,9 +1512,7 @@ static void emitDebugLocValue(const AsmPrinter &AP,
// FIXME: ^
}
void DebugLocEntry::finalize(const AsmPrinter &AP,
const DITypeIdentifierMap &TypeIdentifierMap) {
void DebugLocEntry::finalize(const AsmPrinter &AP, const MDBasicType *BT) {
BufferByteStreamer Streamer(DWARFBytes, Comments);
const DebugLocEntry::Value Value = Values[0];
if (Value.isBitPiece()) {
@ -1538,11 +1539,11 @@ void DebugLocEntry::finalize(const AsmPrinter &AP,
}
Offset += PieceSize;
emitDebugLocValue(AP, TypeIdentifierMap, Streamer, Piece, PieceOffset);
emitDebugLocValue(AP, BT, Streamer, Piece, PieceOffset);
}
} else {
assert(Values.size() == 1 && "only pieces may have >1 value");
emitDebugLocValue(AP, TypeIdentifierMap, Streamer, Value, 0);
emitDebugLocValue(AP, BT, Streamer, Value, 0);
}
}