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Add support for hashing location information for CU level hashes.

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Add a testcase based on sret.cpp where we can now hash the entire
compile unit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203319 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2014-03-08 00:29:41 +00:00
parent d07494f102
commit b1c8844101
5 changed files with 444 additions and 7 deletions
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34
lib/CodeGen/AsmPrinter/DIEHash.cpp
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@ -13,8 +13,10 @@
#define DEBUG_TYPE "dwarfdebug"
#include "ByteStreamer.h"
#include "DIEHash.h"
#include "DIE.h"
#include "DwarfDebug.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/AsmPrinter.h"
@ -279,6 +281,28 @@ void DIEHash::hashBlockData(const SmallVectorImpl<DIEValue *> &Values) {
Hash.update((uint64_t)cast<DIEInteger>(*I)->getValue());
}
// Hash the contents of a loclistptr class.
void DIEHash::hashLocList(const DIELocList &LocList) {
SmallVectorImpl<DotDebugLocEntry>::const_iterator Start =
AP->getDwarfDebug()->getDebugLocEntries().begin();
Start += LocList.getValue();
HashingByteStreamer Streamer(*this);
for (SmallVectorImpl<DotDebugLocEntry>::const_iterator
I = Start,
E = AP->getDwarfDebug()->getDebugLocEntries().end();
I != E; ++I) {
const DotDebugLocEntry &Entry = *I;
// Go through the entries until we hit the end of the list,
// which is the next empty entry.
if (Entry.isEmpty())
return;
else if (Entry.isMerged())
continue;
else
AP->getDwarfDebug()->emitDebugLocEntry(Streamer, Entry);
}
}
// Hash an individual attribute \param Attr based on the type of attribute and
// the form.
void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
@ -333,19 +357,23 @@ void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
break;
case DIEValue::isBlock:
case DIEValue::isLoc:
case DIEValue::isLocList:
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 {
} else if (isa<DIELoc>(Value)) {
addULEB128(cast<DIELoc>(Value)->ComputeSize(AP));
hashBlockData(cast<DIELoc>(Value)->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));
}
break;
// FIXME: Handle loclistptr.
case DIEValue::isLocList:
// FIXME: It's uncertain whether or not we should handle this at the moment.
case DIEValue::isExpr:
case DIEValue::isLabel: