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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82729 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Mike Stump 2009-09-24 23:21:26 +00:00
parent ee4b8a7781
commit 7e3720da38
1 changed files with 6 additions and 14 deletions
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20
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -664,7 +664,6 @@ void DwarfDebug::AddBlockByrefAddress(DbgVariable *&DV, DIE *Die,
// Find the __forwarding field and the variable field in the __Block_byref
// struct.
DIArray Fields = blockStruct.getTypeArray();
DIDescriptor varField = DIDescriptor();
DIDescriptor forwardingField = DIDescriptor();
@ -681,20 +680,18 @@ void DwarfDebug::AddBlockByrefAddress(DbgVariable *&DV, DIE *Die,
varField = Element;
}
assert (!varField.isNull() && "Can't find byref variable in Block struct");
assert (!forwardingField.isNull()
&& "Can't find forwarding field in Block struct");
assert(!varField.isNull() && "Can't find byref variable in Block struct");
assert(!forwardingField.isNull()
&& "Can't find forwarding field in Block struct");
// Get the offsets for the forwarding field and the variable field.
unsigned int forwardingFieldOffset =
DIDerivedType(forwardingField.getNode()).getOffsetInBits() >> 3;
unsigned int varFieldOffset =
DIDerivedType(varField.getNode()).getOffsetInBits() >> 3;
// Decode the original location, and use that as the start of the
// byref variable's location.
// Decode the original location, and use that as the start of the byref
// variable's location.
unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
DIEBlock *Block = new DIEBlock();
@ -717,16 +714,14 @@ void DwarfDebug::AddBlockByrefAddress(DbgVariable *&DV, DIE *Die,
AddUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
}
// If we started with a pointer to the__Block_byref... struct, then
// If we started with a pointer to the __Block_byref... struct, then
// the first thing we need to do is dereference the pointer (DW_OP_deref).
if (isPointer)
AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
// Next add the offset for the '__forwarding' field:
// DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in
// adding the offset if it's 0.
if (forwardingFieldOffset > 0) {
AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
AddUInt(Block, 0, dwarf::DW_FORM_udata, forwardingFieldOffset);
@ -734,20 +729,17 @@ void DwarfDebug::AddBlockByrefAddress(DbgVariable *&DV, DIE *Die,
// Now dereference the __forwarding field to get to the real __Block_byref
// struct: DW_OP_deref.
AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
// Now that we've got the real __Block_byref... struct, add the offset
// for the variable's field to get to the location of the actual variable:
// DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0.
if (varFieldOffset > 0) {
AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
AddUInt(Block, 0, dwarf::DW_FORM_udata, varFieldOffset);
}
// Now attach the location information to the DIE.
AddBlock(Die, Attribute, 0, Block);
}