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Rewrite the attribute hashing algorithm to use the type of the value

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pointed to by the attribute, rather than the form as a first
step to determining how to hash the values. No functional change
intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203044 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2014-03-06 00:38:32 +00:00
parent 025c1cefca
commit 028462964b
1 changed files with 37 additions and 33 deletions
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70
lib/CodeGen/AsmPrinter/DIEHash.cpp
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@ -300,42 +300,41 @@ void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
// reproducibility of the signature, the set of forms used in the signature
// computation is limited to the following: DW_FORM_sdata, DW_FORM_flag,
// DW_FORM_string, and DW_FORM_block.
switch (Desc->getForm()) {
case dwarf::DW_FORM_string:
llvm_unreachable(
"Add support for DW_FORM_string if we ever start emitting them again");
case dwarf::DW_FORM_GNU_str_index:
case dwarf::DW_FORM_strp:
switch (Value->getType()) {
case DIEValue::isInteger: {
addULEB128('A');
addULEB128(Attribute);
switch (Desc->getForm()) {
case dwarf::DW_FORM_data1:
case dwarf::DW_FORM_data2:
case dwarf::DW_FORM_data4:
case dwarf::DW_FORM_data8:
case dwarf::DW_FORM_udata:
case dwarf::DW_FORM_sdata:
addULEB128(dwarf::DW_FORM_sdata);
addSLEB128((int64_t)cast<DIEInteger>(Value)->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());
break;
default:
llvm_unreachable("Unknown integer form!");
}
break;
}
case DIEValue::isString:
addULEB128('A');
addULEB128(Attribute);
addULEB128(dwarf::DW_FORM_string);
addString(cast<DIEString>(Value)->getString());
break;
case dwarf::DW_FORM_data1:
case dwarf::DW_FORM_data2:
case dwarf::DW_FORM_data4:
case dwarf::DW_FORM_data8:
case dwarf::DW_FORM_udata:
case dwarf::DW_FORM_sdata:
addULEB128('A');
addULEB128(Attribute);
addULEB128(dwarf::DW_FORM_sdata);
addSLEB128((int64_t)cast<DIEInteger>(Value)->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('A');
addULEB128(Attribute);
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:
case DIEValue::isBlock:
case DIEValue::isLoc:
addULEB128('A');
addULEB128(Attribute);
addULEB128(dwarf::DW_FORM_block);
@ -347,8 +346,13 @@ void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) {
hashBlockData(cast<DIELoc>(Value)->getValues());
}
break;
default:
llvm_unreachable("Add support for additional forms");
case DIEValue::isExpr:
case DIEValue::isLabel:
case DIEValue::isDelta:
case DIEValue::isEntry:
case DIEValue::isTypeSignature:
case DIEValue::isLocList:
llvm_unreachable("Add support for additional value types.");
}
}