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Debug Info: Implement DwarfCompileUnit::addComplexAddress() using

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DIEDwarfExpression (and get rid of a bunch of redundant code).

NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225900 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl 2015-01-14 01:01:30 +00:00
parent db48bda4a1
commit f82fc00e4c
1 changed files with 14 additions and 47 deletions
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61
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
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@ -1,5 +1,6 @@
#include "DwarfCompileUnit.h"
#include "DwarfExpression.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/GlobalValue.h"
@ -771,53 +772,19 @@ void DwarfCompileUnit::addComplexAddress(const DbgVariable &DV, DIE &Die,
dwarf::Attribute Attribute,
const MachineLocation &Location) {
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
unsigned N = DV.getNumAddrElements();
unsigned i = 0;
bool validReg;
if (Location.isReg()) {
if (N >= 2 && DV.getAddrElement(0) == dwarf::DW_OP_plus) {
assert(!DV.getVariable().isIndirect() &&
"double indirection not handled");
// If first address element is OpPlus then emit
// DW_OP_breg + Offset instead of DW_OP_reg + Offset.
validReg = addRegisterOffset(*Loc, Location.getReg(), DV.getAddrElement(1));
i = 2;
} else if (N >= 2 && DV.getAddrElement(0) == dwarf::DW_OP_deref) {
assert(!DV.getVariable().isIndirect() &&
"double indirection not handled");
validReg = addRegisterOpPiece(*Loc, Location.getReg(),
DV.getExpression().getPieceSize(),
DV.getExpression().getPieceOffset());
i = 3;
} else
validReg = addRegisterOpPiece(*Loc, Location.getReg());
} else
validReg = addRegisterOffset(*Loc, Location.getReg(), Location.getOffset());
if (!validReg)
return;
for (; i < N; ++i) {
uint64_t Element = DV.getAddrElement(i);
if (Element == dwarf::DW_OP_plus) {
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
addUInt(*Loc, dwarf::DW_FORM_udata, DV.getAddrElement(++i));
} else if (Element == dwarf::DW_OP_deref) {
if (!Location.isReg())
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
} else if (Element == dwarf::DW_OP_piece) {
const unsigned SizeOfByte = 8;
unsigned PieceOffsetInBits = DV.getAddrElement(++i) * SizeOfByte;
unsigned PieceSizeInBits = DV.getAddrElement(++i) * SizeOfByte;
// Emit DW_OP_bit_piece Size Offset.
assert(PieceSizeInBits > 0 && "piece has zero size");
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_bit_piece);
addUInt(*Loc, dwarf::DW_FORM_udata, PieceSizeInBits);
addUInt(*Loc, dwarf::DW_FORM_udata, PieceOffsetInBits);
} else
llvm_unreachable("unknown DIBuilder Opcode");
DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
DIExpression Expr = DV.getExpression();
if (Location.getOffset()) {
if (DwarfExpr.AddMachineRegIndirect(Location.getReg(),
Location.getOffset())) {
DwarfExpr.AddExpression(Expr);
assert(!DV.getVariable().isIndirect()
&& "double indirection not handled");
}
} else {
if (DwarfExpr.AddMachineRegExpression(Expr, Location.getReg()))
if (DV.getVariable().isIndirect())
DwarfExpr.EmitOp(dwarf::DW_OP_deref);
}
// Now attach the location information to the DIE.