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Until now all debug info MDNodes referred to a root MDNode, a compile unit. This simplified handling of these needs in dwarf writer. However, one side effect of this is that during link time optimization all these MDNodes are _not_ uniqued. In other words there will be N number of MDNodes describing "int", "char" and all other types, which would suddenly grow when each object file starts using libraries like STL.

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MDNodes graph structure such that compiler unit keeps track of important MDNodes and update dwarf writer to process mdnodes top-down instead of bottom up.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137778 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2011-08-16 22:09:43 +00:00
parent 054ddf799b
commit 94c7ddb6f5
9 changed files with 249 additions and 179 deletions
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10
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
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@ -577,7 +577,10 @@ void CompileUnit::addToContextOwner(DIE *Die, DIDescriptor Context) {
/// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
/// given DIType.
DIE *CompileUnit::getOrCreateTypeDIE(DIType Ty) {
DIE *CompileUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
DIType Ty(TyNode);
if (!Ty.Verify())
return NULL;
DIE *TyDIE = getDIE(Ty);
if (TyDIE)
return TyDIE;
@ -629,7 +632,8 @@ void CompileUnit::addType(DIE *Entity, DIType Ty) {
void CompileUnit::addGlobalType(DIType Ty) {
DIDescriptor Context = Ty.getContext();
if (Ty.isCompositeType() && !Ty.getName().empty() && !Ty.isForwardDecl()
&& (Context.isCompileUnit() || Context.isFile() || Context.isNameSpace()))
&& (!Context || Context.isCompileUnit() || Context.isFile()
|| Context.isNameSpace()))
if (DIEEntry *Entry = getDIEEntry(Ty))
GlobalTypes[Ty.getName()] = Entry->getEntry();
}
@ -1358,7 +1362,7 @@ DIE *CompileUnit::createMemberDIE(DIDerivedType DT) {
addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
dwarf::DW_ACCESS_private);
// Otherwise C++ member and base classes are considered public.
else if (DT.getCompileUnit().getLanguage() == dwarf::DW_LANG_C_plus_plus)
else
addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_flag,
dwarf::DW_ACCESS_public);
if (DT.isVirtual())