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Remove DwarfDebug::PrevSection, PrevCU is sufficient for handling address range holes.

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PrevSection/PrevCU are used to detect holes in the address range of a CU
to ensure the DW_AT_ranges does not include those holes. When we see a
function with no debug info, though it may be in the same range as the
prior and subsequent functions, there should be a gap in the CU's
ranges. By setting PrevCU to null in that case, the range would not be
extended to cover the gap.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217466 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2014-09-09 22:56:36 +00:00
parent 589d2fc893
commit 9e0dae166f
3 changed files with 3 additions and 15 deletions
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2
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -1667,7 +1667,6 @@ void DwarfDebug::endFunction(const MachineFunction *MF) {
// If we don't have a lexical scope for this function then there will
// be a hole in the range information. Keep note of this by setting the
// previously used section to nullptr.
PrevSection = nullptr;
PrevCU = nullptr;
CurFn = nullptr;
return;
@ -1710,7 +1709,6 @@ void DwarfDebug::endFunction(const MachineFunction *MF) {
// Add the range of this function to the list of ranges for the CU.
RangeSpan Span(FunctionBeginSym, FunctionEndSym);
TheCU.addRange(std::move(Span));
PrevSection = Asm->getCurrentSection();
PrevCU = &TheCU;
// Clear debug info

7
lib/CodeGen/AsmPrinter/DwarfDebug.h
View File

@ -243,10 +243,6 @@ class DwarfDebug : public AsmPrinterHandler {
// If nonnull, stores the current machine instruction we're processing.
const MachineInstr *CurMI;
// If nonnull, stores the section that the previous function was allocated to
// emitting.
const MCSection *PrevSection;
// If nonnull, stores the CU in which the previous subprogram was contained.
const DwarfCompileUnit *PrevCU;
@ -631,9 +627,6 @@ public:
/// Returns the section symbol for the .debug_loc section.
MCSymbol *getDebugLocSym() const { return DwarfDebugLocSectionSym; }
/// Returns the previous section that was emitted into.
const MCSection *getPrevSection() const { return PrevSection; }
/// Returns the previous CU that was being updated
const DwarfCompileUnit *getPrevCU() const { return PrevCU; }

9
lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -2044,16 +2044,13 @@ void DwarfUnit::addRange(RangeSpan Range) {
// check the current section and CU against the previous section and CU we
// emitted into and the subprogram was contained within. If these are the
// same then extend our current range, otherwise add this as a new range.
if (CURanges.size() == 0 ||
this != DD->getPrevCU() ||
Asm->getCurrentSection() != DD->getPrevSection()) {
if (CURanges.empty() || this != DD->getPrevCU() ||
(&CURanges.back().getEnd()->getSection() !=
&Range.getEnd()->getSection())) {
CURanges.push_back(Range);
return;
}
assert(&(CURanges.back().getEnd()->getSection()) ==
&(Range.getEnd()->getSection()) &&
"We can only append to a range in the same section!");
CURanges.back().setEnd(Range.getEnd());
}
}