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Add support for hashing attributes with DW_FORM_block. This required

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passing down an AsmPrinter instance so we could compute the size of
the block which could be target specific. All of the test cases in
the unittest don't have any target specific data so we can use a NULL
AsmPrinter there. This also depends upon block data being added as
integers.

We can now hash the entire fission-cu.ll compile unit so turn the
flag on there with the hash value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201752 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2014-02-20 02:50:45 +00:00
parent eed3d708ee
commit 31dd38ed2f
5 changed files with 93 additions and 4 deletions
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26
lib/CodeGen/AsmPrinter/DIEHash.cpp
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@ -17,6 +17,7 @@
#include "DIE.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Endian.h"
@ -269,6 +270,15 @@ void DIEHash::hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
computeHash(Entry);
}
// 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());
}
// Hash an individual attribute \param Attr based on the type of attribute and
// the form.
void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
@ -321,6 +331,22 @@ void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
addULEB128(dwarf::DW_FORM_flag);
addULEB128((int64_t)cast<DIEInteger>(Value)->getValue());
break;
case dwarf::DW_FORM_exprloc:
case dwarf::DW_FORM_block1:
case dwarf::DW_FORM_block2:
case dwarf::DW_FORM_block4:
case dwarf::DW_FORM_block:
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 {
addULEB128(cast<DIELoc>(Value)->ComputeSize(AP));
hashBlockData(cast<DIELoc>(Value)->getValues());
}
break;
default:
llvm_unreachable("Add support for additional forms");
}