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Some revisions to Devang's change r136759 for merged global debug info.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136802 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2011-08-03 19:42:51 +00:00
parent e4ad50bb43
commit cfc55c2fc9
1 changed files with 9 additions and 23 deletions
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32
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -955,12 +955,13 @@ CompileUnit *DwarfDebug::getCompileUnit(const MDNode *N) const {
static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
if (!CE || CE->getNumOperands() != 3 ||
CE->getOpcode() != Instruction::GetElementPtr ||
!isa<PointerType>(CE->getOperand(0)->getType()))
CE->getOpcode() != Instruction::GetElementPtr)
return NULL;
// First operand points to a global value.
if (!isa<GlobalValue>(CE->getOperand(0)))
// First operand points to a global struct.
Value *Ptr = CE->getOperand(0);
if (!isa<GlobalValue>(Ptr) ||
!isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
return NULL;
// Second operand is zero.
@ -975,23 +976,6 @@ static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
return CE;
}
// getMergedGlobalElementOffset - If CE is accessing a merged global
// then find byte offset of the element accessed by CE. This must be
// used only CE returned by getMergedGlobalExpr(). See above.
static uint64_t getMergedGlobalElementOffset(const TargetData &TD,
const ConstantExpr *CE) {
assert (getMergedGlobalExpr(CE) && "This is not a merged global!");
uint64_t e = cast<ConstantInt>(CE->getOperand(2))->getZExtValue();
if (e == 0) return 0;
uint64_t Offset = 0;
const PointerType *PTy = dyn_cast<PointerType>(CE->getOperand(0)->getType());
const StructType *STy = dyn_cast<StructType>(PTy->getElementType());
for (uint64_t i = 0; i != e; ++i)
Offset += TD.getTypeAllocSize(STy->getElementType(i));
return Offset;
}
/// constructGlobalVariableDIE - Construct global variable DIE.
void DwarfDebug::constructGlobalVariableDIE(const MDNode *N) {
DIGlobalVariable GV(N);
@ -1060,12 +1044,14 @@ void DwarfDebug::constructGlobalVariableDIE(const MDNode *N) {
else if (const ConstantExpr *CE = getMergedGlobalExpr(N->getOperand(11))) {
// GV is a merged global.
DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
Value *Ptr = CE->getOperand(0);
TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
TheCU->addLabel(Block, 0, dwarf::DW_FORM_udata,
Asm->Mang->getSymbol(cast<GlobalValue>(CE->getOperand(0))));
Asm->Mang->getSymbol(cast<GlobalValue>(Ptr)));
TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
SmallVector<Value*, 3> Idx(CE->op_begin()+1, CE->op_end());
TheCU->addUInt(Block, 0, dwarf::DW_FORM_udata,
getMergedGlobalElementOffset(Asm->getTargetData(), CE));
Asm->getTargetData().getIndexedOffset(Ptr->getType(), Idx));
TheCU->addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
TheCU->addBlock(VariableDIE, dwarf::DW_AT_location, 0, Block);
}