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AsmPrinter: Change DIEValue to be stored by value

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Change `DIEValue` to be stored/passed/etc. by value, instead of
reference.  It's now a discriminated union, with a `Val` field storing
the actual type.  The classes that used to inherit from `DIEValue` no
longer do.  There are two categories of these:

  - Small values fit in a single pointer and are stored by value.
  - Large values require auxiliary storage, and are stored by reference.

The only non-mechanical change is to tools/dsymutil/DwarfLinker.cpp.  It
was relying on `DIEInteger`s being passed around by reference, so I
replaced that assumption with a `PatchLocation` type that stores a safe
reference to where the `DIEInteger` lives instead.

This commit causes a temporary regression in memory usage, since I've
left merging `DIEAbbrevData` into `DIEValue` for a follow-up commit.  I
measured an increase from 845 MB to 879 MB, around 3.9%.  The follow-up
drops it lower than the starting point, and I've only recently brought
the memory this low anyway, so I'm committing these changes separately
to keep them incremental.  (I also considered swapping the commits, but
the other one first would cause a lot more code churn.)

(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@238349 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-05-27 19:22:50 +00:00
parent 3e7c30ada1
commit b9d92c6a8d
12 changed files with 514 additions and 544 deletions
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51
lib/CodeGen/AsmPrinter/DIEHash.cpp
View File

@@ -31,18 +31,14 @@ using namespace llvm;
/// \brief Grabs the string in whichever attribute is passed in and returns
/// a reference to it.
static StringRef getDIEStringAttr(const DIE &Die, uint16_t Attr) {
const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
const auto &Values = Die.getValues();
const DIEAbbrev &Abbrevs = Die.getAbbrev();
// Iterate through all the attributes until we find the one we're
// looking for, if we can't find it return an empty string.
for (size_t i = 0; i < Values.size(); ++i) {
if (Abbrevs.getData()[i].getAttribute() == Attr) {
DIEValue *V = Values[i];
assert(isa<DIEString>(V) && "String requested. Not a string.");
DIEString *S = cast<DIEString>(V);
return S->getString();
}
if (Abbrevs.getData()[i].getAttribute() == Attr)
return Values[i].getDIEString().getString();
}
return StringRef("");
}
@@ -123,7 +119,7 @@ void DIEHash::addParentContext(const DIE &Parent) {
// Collect all of the attributes for a particular DIE in single structure.
void DIEHash::collectAttributes(const DIE &Die, DIEAttrs &Attrs) {
const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
const SmallVectorImpl<DIEValue> &Values = Die.getValues();
const DIEAbbrev &Abbrevs = Die.getAbbrev();
#define COLLECT_ATTR(NAME) \
@@ -274,11 +270,9 @@ void DIEHash::hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
// Hash all of the values in a block like set of values. This assumes that
// all of the data is going to be added as integers.
void DIEHash::hashBlockData(const SmallVectorImpl<DIEValue *> &Values) {
for (SmallVectorImpl<DIEValue *>::const_iterator I = Values.begin(),
E = Values.end();
I != E; ++I)
Hash.update((uint64_t)cast<DIEInteger>(*I)->getValue());
void DIEHash::hashBlockData(const SmallVectorImpl<DIEValue> &Values) {
for (auto I = Values.begin(), E = Values.end(); I != E; ++I)
Hash.update((uint64_t)I->getDIEInteger().getValue());
}
// Hash the contents of a loclistptr class.
@@ -293,7 +287,7 @@ void DIEHash::hashLocList(const DIELocList &LocList) {
// Hash an individual attribute \param Attr based on the type of attribute and
// the form.
void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
const DIEValue *Value = Attr.Val;
const DIEValue &Value = Attr.Val;
const DIEAbbrevData *Desc = Attr.Desc;
dwarf::Attribute Attribute = Desc->getAttribute();
@@ -304,12 +298,15 @@ void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
// computation is limited to the following: DW_FORM_sdata, DW_FORM_flag,
// DW_FORM_string, and DW_FORM_block.
switch (Value->getType()) {
switch (Value.getType()) {
case DIEValue::isNone:
llvm_unreachable("Expected valid DIEValue");
// 7.27 Step 3
// ... An attribute that refers to another type entry T is processed as
// follows:
case DIEValue::isEntry:
hashDIEEntry(Attribute, Tag, cast<DIEEntry>(Value)->getEntry());
hashDIEEntry(Attribute, Tag, Value.getDIEEntry().getEntry());
break;
case DIEValue::isInteger: {
addULEB128('A');
@@ -322,14 +319,14 @@ void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
case dwarf::DW_FORM_udata:
case dwarf::DW_FORM_sdata:
addULEB128(dwarf::DW_FORM_sdata);
addSLEB128((int64_t)cast<DIEInteger>(Value)->getValue());
addSLEB128((int64_t)Value.getDIEInteger().getValue());
break;
// DW_FORM_flag_present is just flag with a value of one. We still give it a
// value so just use the value.
case dwarf::DW_FORM_flag_present:
case dwarf::DW_FORM_flag:
addULEB128(dwarf::DW_FORM_flag);
addULEB128((int64_t)cast<DIEInteger>(Value)->getValue());
addULEB128((int64_t)Value.getDIEInteger().getValue());
break;
default:
llvm_unreachable("Unknown integer form!");
@@ -340,7 +337,7 @@ void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
addULEB128('A');
addULEB128(Attribute);
addULEB128(dwarf::DW_FORM_string);
addString(cast<DIEString>(Value)->getString());
addString(Value.getDIEString().getString());
break;
case DIEValue::isBlock:
case DIEValue::isLoc:
@@ -348,17 +345,17 @@ void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
addULEB128('A');
addULEB128(Attribute);
addULEB128(dwarf::DW_FORM_block);
if (isa<DIEBlock>(Value)) {
addULEB128(cast<DIEBlock>(Value)->ComputeSize(AP));
hashBlockData(cast<DIEBlock>(Value)->getValues());
} else if (isa<DIELoc>(Value)) {
addULEB128(cast<DIELoc>(Value)->ComputeSize(AP));
hashBlockData(cast<DIELoc>(Value)->getValues());
if (Value.getType() == DIEValue::isBlock) {
addULEB128(Value.getDIEBlock().ComputeSize(AP));
hashBlockData(Value.getDIEBlock().getValues());
} else if (Value.getType() == DIEValue::isLoc) {
addULEB128(Value.getDIELoc().ComputeSize(AP));
hashBlockData(Value.getDIELoc().getValues());
} else {
// We could add the block length, but that would take
// a bit of work and not add a lot of uniqueness
// to the hash in some way we could test.
hashLocList(*cast<DIELocList>(Value));
hashLocList(Value.getDIELocList());
}
break;
// FIXME: It's uncertain whether or not we should handle this at the moment.
@@ -375,7 +372,7 @@ void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
void DIEHash::hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag) {
#define ADD_ATTR(ATTR) \
{ \
if (ATTR.Val != 0) \
if (ATTR.Val) \
hashAttribute(ATTR, Tag); \
}