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Debug info: Refactor EmitDwarfRegOpPiece to be a member function of

Browse Source 
AsmPrinter.
No functional change.

http://reviews.llvm.org/D3373
rdar://problem/15928306

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207369 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl 2014-04-27 18:25:45 +00:00
parent eccd574af8
commit 75955d843f
2 changed files with 55 additions and 18 deletions
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10
include/llvm/CodeGen/AsmPrinter.h
View File

@ -430,7 +430,17 @@ namespace llvm {
/// encoding specified.
virtual unsigned getISAEncoding() { return 0; }
/// \brief Emit a partial dwarf register operation.
/// \param MLoc the register
/// \param PieceSizeInBits size and
/// \param PieceOffsetBits offset of the piece in bits, if this is one
/// piece of an aggregate value.
void EmitDwarfRegOpPiece(ByteStreamer &BS, const MachineLocation &MLoc,
unsigned PieceSize,
unsigned PieceOffset) const;
/// EmitDwarfRegOp - Emit dwarf register operation.
/// \param Indirect whether this is a register-indirect address
virtual void EmitDwarfRegOp(ByteStreamer &BS, const MachineLocation &MLoc,
bool Indirect) const;

63
lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
View File

@ -217,30 +217,48 @@ static void emitDwarfRegOpIndirect(ByteStreamer &Streamer, int Reg, int Offset,
/// Emit a dwarf register operation for describing
/// - a small value occupying only part of a register or
/// - a small register representing only part of a value.
static void emitDwarfOpPiece(ByteStreamer &Streamer, unsigned Size,
unsigned Offset) {
assert(Size > 0);
if (Offset > 0) {
static void emitDwarfOpPiece(ByteStreamer &Streamer, unsigned SizeInBits,
unsigned OffsetInBits) {
assert(SizeInBits > 0 && "zero-sized piece");
unsigned SizeOfByte = 8;
if (OffsetInBits > 0 || SizeInBits % SizeOfByte) {
Streamer.EmitInt8(dwarf::DW_OP_bit_piece, "DW_OP_bit_piece");
Streamer.EmitULEB128(Size, Twine(Size));
Streamer.EmitULEB128(Offset, Twine(Offset));
Streamer.EmitULEB128(SizeInBits, Twine(SizeInBits));
Streamer.EmitULEB128(OffsetInBits, Twine(OffsetInBits));
} else {
Streamer.EmitInt8(dwarf::DW_OP_piece, "DW_OP_piece");
unsigned ByteSize = Size / 8; // Assuming 8 bits per byte.
unsigned ByteSize = SizeInBits / SizeOfByte;
Streamer.EmitULEB128(ByteSize, Twine(ByteSize));
}
}
/// Emit a shift-right dwarf expression.
static void emitDwarfOpShr(ByteStreamer &Streamer,
unsigned ShiftBy) {
Streamer.EmitInt8(dwarf::DW_OP_constu, "DW_OP_constu");
Streamer.EmitULEB128(ShiftBy);
Streamer.EmitInt8(dwarf::DW_OP_shr, "DW_OP_shr");
}
/// Some targets do not provide a DWARF register number for every
/// register. This function attempts to emit a dwarf register by
/// register. This function attempts to emit a DWARF register by
/// emitting a piece of a super-register or by piecing together
/// multiple subregisters that alias the register.
static void EmitDwarfRegOpPiece(ByteStreamer &Streamer, const AsmPrinter &AP,
const MachineLocation &MLoc) {
void AsmPrinter::EmitDwarfRegOpPiece(ByteStreamer &Streamer,
const MachineLocation &MLoc,
unsigned PieceSizeInBits,
unsigned PieceOffsetInBits) const {
assert(!MLoc.isIndirect());
const TargetRegisterInfo *TRI = AP.TM.getRegisterInfo();
const TargetRegisterInfo *TRI = TM.getRegisterInfo();
int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
// If this is a valid register number, emit it.
if (Reg >= 0) {
emitDwarfRegOp(Streamer, Reg);
emitDwarfOpPiece(Streamer, PieceSizeInBits, PieceOffsetInBits);
return;
}
// Walk up the super-register chain until we find a valid number.
// For example, EAX on x86_64 is a 32-bit piece of RAX with offset 0.
for (MCSuperRegIterator SR(MLoc.getReg(), TRI); SR.isValid(); ++SR) {
@ -249,9 +267,19 @@ static void EmitDwarfRegOpPiece(ByteStreamer &Streamer, const AsmPrinter &AP,
unsigned Idx = TRI->getSubRegIndex(*SR, MLoc.getReg());
unsigned Size = TRI->getSubRegIdxSize(Idx);
unsigned Offset = TRI->getSubRegIdxOffset(Idx);
AP.OutStreamer.AddComment("super-register");
OutStreamer.AddComment("super-register");
emitDwarfRegOp(Streamer, Reg);
emitDwarfOpPiece(Streamer, Size, Offset);
if (PieceOffsetInBits == Offset) {
emitDwarfOpPiece(Streamer, Size, Offset);
} else {
// If this is part of a variable in a sub-register at a
// non-zero offset, we need to manually shift the value into
// place, since the DW_OP_piece describes the part of the
// variable, not the position of the subregister.
emitDwarfOpPiece(Streamer, Size, PieceOffsetInBits);
if (Offset)
emitDwarfOpShr(Streamer, Offset);
}
return;
}
}
@ -261,7 +289,7 @@ static void EmitDwarfRegOpPiece(ByteStreamer &Streamer, const AsmPrinter &AP,
//
// Keep track of the current position so we can emit the more
// efficient DW_OP_piece.
unsigned CurPos = 0;
unsigned CurPos = PieceOffsetInBits;
// The size of the register in bits, assuming 8 bits per byte.
unsigned RegSize = TRI->getMinimalPhysRegClass(MLoc.getReg())->getSize() * 8;
// Keep track of the bits in the register we already emitted, so we
@ -282,7 +310,7 @@ static void EmitDwarfRegOpPiece(ByteStreamer &Streamer, const AsmPrinter &AP,
// If this sub-register has a DWARF number and we haven't covered
// its range, emit a DWARF piece for it.
if (Reg >= 0 && Intersection.any()) {
AP.OutStreamer.AddComment("sub-register");
OutStreamer.AddComment("sub-register");
emitDwarfRegOp(Streamer, Reg);
emitDwarfOpPiece(Streamer, Size, Offset == CurPos ? 0 : Offset);
CurPos = Offset + Size;
@ -292,7 +320,7 @@ static void EmitDwarfRegOpPiece(ByteStreamer &Streamer, const AsmPrinter &AP,
}
}
if (CurPos == 0) {
if (CurPos == PieceOffsetInBits) {
// FIXME: We have no reasonable way of handling errors in here.
Streamer.EmitInt8(dwarf::DW_OP_nop,
"nop (could not find a dwarf register number)");
@ -318,8 +346,7 @@ void AsmPrinter::EmitDwarfRegOp(ByteStreamer &Streamer,
}
// Attempt to find a valid super- or sub-register.
if (!Indirect && !MLoc.isIndirect())
return EmitDwarfRegOpPiece(Streamer, *this, MLoc);
return EmitDwarfRegOpPiece(Streamer, MLoc, 0, 0);
}
if (MLoc.isIndirect())