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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190544 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren 2013-09-11 19:40:28 +00:00
parent 4f7e2c38e8
commit 995de6cddf
1 changed files with 14 additions and 2 deletions
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16
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -424,10 +424,13 @@ DIE *DwarfDebug::updateSubprogramScopeDIE(CompileUnit *SPCU,
return SPDie;
}
/// Check whether we should create a DIE for the given Scope, return true
/// if we don't create a DIE (the corresponding DIE is null).
bool DwarfDebug::isLexicalScopeDIENull(LexicalScope *Scope) {
if (Scope->isAbstractScope())
return false;
// We don't create a DIE if there is no Range.
const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
if (Ranges.empty())
return true;
@ -435,6 +438,8 @@ bool DwarfDebug::isLexicalScopeDIENull(LexicalScope *Scope) {
if (Ranges.size() > 1)
return false;
// We don't create a DIE if we have a single Range and the end label
// is null.
SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin();
MCSymbol *End = getLabelAfterInsn(RI->second);
return !End;
@ -595,6 +600,9 @@ DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
DIE *ObjectPointer = NULL;
bool ChildrenCreated = false;
// We try to create the scope DIE first, then the children DIEs. This will
// avoid creating un-used children then removing them later when we find out
// the scope DIE is null.
DIE *ScopeDIE = NULL;
if (Scope->getInlinedAt())
ScopeDIE = constructInlinedScopeDIE(TheCU, Scope);
@ -610,12 +618,15 @@ DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
ScopeDIE = updateSubprogramScopeDIE(TheCU, DS);
}
else {
// Early exit when we know the scope DIE is going to be null.
if (isLexicalScopeDIENull(Scope))
return NULL;
// We create children only when we know the scope DIE is not going to be
// null.
// We create children here when we know the scope DIE is not going to be
// null and the children will be added to the scope DIE.
ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
ChildrenCreated = true;
// There is no need to emit empty lexical block DIE.
std::pair<ImportedEntityMap::const_iterator,
ImportedEntityMap::const_iterator> Range = std::equal_range(
@ -637,6 +648,7 @@ DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
return NULL;
}
if (!ChildrenCreated)
// We create children when the scope DIE is not null.
ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
// Add children