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Use the range machinery for DW_AT_ranges and DW_AT_high/lo_pc.

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This commit moves us from a single range per subprogram to extending
ranges if we are:

a) In the same section, and
b) In the same enclosing CU.

This means we have more fine grained ranges for compile units, and fewer
ranges overall when we have multiple functions in the same CU
adjacent to each other in the object file.

Also remove all of the earlier hacks around this functionality for
function sections etc. Also update all of the testcases to take into
account the merging functionality.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204277 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2014-03-19 22:42:36 +00:00
parent 925147ca20
commit f2a52c372d
10 changed files with 245 additions and 144 deletions
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54
lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@@ -282,22 +282,31 @@ void DwarfUnit::addSectionOffset(DIE *Die, dwarf::Attribute Attribute,
/// DW_FORM_addr or DW_FORM_GNU_addr_index.
///
void DwarfCompileUnit::addLabelAddress(DIE *Die, dwarf::Attribute Attribute,
MCSymbol *Label) {
const MCSymbol *Label) {
if (!DD->useSplitDwarf())
return addLocalLabelAddress(Die, Attribute, Label);
if (Label)
DD->addArangeLabel(SymbolCU(this, Label));
if (!DD->useSplitDwarf()) {
if (Label) {
DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
} else {
DIEValue *Value = new (DIEValueAllocator) DIEInteger(0);
Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
}
unsigned idx = DU->getAddrPoolIndex(Label);
DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
Die->addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
}
void DwarfCompileUnit::addLocalLabelAddress(DIE *Die,
dwarf::Attribute Attribute,
const MCSymbol *Label) {
if (Label)
DD->addArangeLabel(SymbolCU(this, Label));
if (Label) {
DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
} else {
unsigned idx = DU->getAddrPoolIndex(Label);
DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
Die->addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
DIEValue *Value = new (DIEValueAllocator) DIEInteger(0);
Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
}
}
@@ -2034,6 +2043,27 @@ void DwarfUnit::emitHeader(const MCSection *ASection,
Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
}
void DwarfUnit::addRange(RangeSpan Range) {
// Only add a range for this unit if we're emitting full debug.
if (getCUNode().getEmissionKind() == DIBuilder::FullDebug) {
// If we have no current ranges just add the range and return, otherwise,
// 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()) {
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());
}
}
void DwarfCompileUnit::initStmtList(MCSymbol *DwarfLineSectionSym) {
// Define start line table label for each Compile Unit.
MCSymbol *LineTableStartSym =