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AsmPrinter: Convert DIE::Values to a linked list

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Change `DIE::Values` to a singly linked list, where each node is
allocated on a `BumpPtrAllocator`.  In order to support `push_back()`,
the list is circular, and points at the tail element instead of the
head.  I abstracted the core list logic out to `IntrusiveBackList` so
that it can be reused for `DIE::Children`, which also cares about
`push_back()`.

This drops llc memory usage from 799 MB down to 735 MB, about 8%.

(I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`;
see r236629 for details.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240733 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-06-25 23:46:41 +00:00
parent d1ceba0333
commit 73e3fb6ba8
11 changed files with 463 additions and 268 deletions
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51
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
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@@ -42,7 +42,8 @@ void DwarfCompileUnit::addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
DD->addArangeLabel(SymbolCU(this, Label));
unsigned idx = DD->getAddressPool().getIndex(Label);
Die.addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, DIEInteger(idx));
Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_GNU_addr_index,
DIEInteger(idx));
}
void DwarfCompileUnit::addLocalLabelAddress(DIE &Die,
@@ -52,9 +53,11 @@ void DwarfCompileUnit::addLocalLabelAddress(DIE &Die,
DD->addArangeLabel(SymbolCU(this, Label));
if (Label)
Die.addValue(Attribute, dwarf::DW_FORM_addr, DIELabel(Label));
Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_addr,
DIELabel(Label));
else
Die.addValue(Attribute, dwarf::DW_FORM_addr, DIEInteger(0));
Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_addr,
DIEInteger(0));
}
unsigned DwarfCompileUnit::getOrCreateSourceID(StringRef FileName,
@@ -225,16 +228,15 @@ void DwarfCompileUnit::addRange(RangeSpan Range) {
CURanges.back().setEnd(Range.getEnd());
}
void DwarfCompileUnit::addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
const MCSymbol *Label,
const MCSymbol *Sec) {
DIE::value_iterator
DwarfCompileUnit::addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
const MCSymbol *Label, const MCSymbol *Sec) {
if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
addLabel(Die, Attribute,
DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
: dwarf::DW_FORM_data4,
Label);
else
addSectionDelta(Die, Attribute, Label, Sec);
return addLabel(Die, Attribute,
DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
: dwarf::DW_FORM_data4,
Label);
return addSectionDelta(Die, Attribute, Label, Sec);
}
void DwarfCompileUnit::initStmtList() {
@@ -242,20 +244,19 @@ void DwarfCompileUnit::initStmtList() {
MCSymbol *LineTableStartSym =
Asm->OutStreamer->getDwarfLineTableSymbol(getUniqueID());
stmtListIndex = std::distance(UnitDie.values_begin(), UnitDie.values_end());
// DW_AT_stmt_list is a offset of line number information for this
// compile unit in debug_line section. For split dwarf this is
// left in the skeleton CU and so not included.
// The line table entries are not always emitted in assembly, so it
// is not okay to use line_table_start here.
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
addSectionLabel(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym,
TLOF.getDwarfLineSection()->getBeginSymbol());
StmtListValue =
addSectionLabel(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym,
TLOF.getDwarfLineSection()->getBeginSymbol());
}
void DwarfCompileUnit::applyStmtList(DIE &D) {
D.addValue(UnitDie.values_begin()[stmtListIndex]);
D.addValue(DIEValueAllocator, *StmtListValue);
}
void DwarfCompileUnit::attachLowHighPC(DIE &D, const MCSymbol *Begin,
@@ -361,11 +362,13 @@ void DwarfCompileUnit::constructScopeDIE(
FinalChildren.push_back(std::move(ScopeDIE));
}
void DwarfCompileUnit::addSectionDelta(DIE &Die, dwarf::Attribute Attribute,
const MCSymbol *Hi, const MCSymbol *Lo) {
Die.addValue(Attribute, DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
: dwarf::DW_FORM_data4,
new (DIEValueAllocator) DIEDelta(Hi, Lo));
DIE::value_iterator
DwarfCompileUnit::addSectionDelta(DIE &Die, dwarf::Attribute Attribute,
const MCSymbol *Hi, const MCSymbol *Lo) {
return Die.addValue(DIEValueAllocator, Attribute,
DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
: dwarf::DW_FORM_data4,
new (DIEValueAllocator) DIEDelta(Hi, Lo));
}
void DwarfCompileUnit::addScopeRangeList(DIE &ScopeDIE,
@@ -781,7 +784,7 @@ void DwarfCompileUnit::addLocationList(DIE &Die, dwarf::Attribute Attribute,
unsigned Index) {
dwarf::Form Form = DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
: dwarf::DW_FORM_data4;
Die.addValue(Attribute, Form, DIELocList(Index));
Die.addValue(DIEValueAllocator, Attribute, Form, DIELocList(Index));
}
void DwarfCompileUnit::applyVariableAttributes(const DbgVariable &Var,
@@ -798,7 +801,7 @@ void DwarfCompileUnit::applyVariableAttributes(const DbgVariable &Var,
/// Add a Dwarf expression attribute data and value.
void DwarfCompileUnit::addExpr(DIELoc &Die, dwarf::Form Form,
const MCExpr *Expr) {
Die.addValue((dwarf::Attribute)0, Form, DIEExpr(Expr));
Die.addValue(DIEValueAllocator, (dwarf::Attribute)0, Form, DIEExpr(Expr));
}
void DwarfCompileUnit::applySubprogramAttributesToDefinition(