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Do not emit empty DW_TAG_lexical_block DIEs. In one test case, size of debug info reduced by almost 7%.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126009 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2011-02-19 01:31:27 +00:00
parent fe19e3f74c
commit 5bc9fec7ec
1 changed files with 20 additions and 17 deletions
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37
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -1800,6 +1800,16 @@ DIE *DwarfDebug::constructScopeDIE(DbgScope *Scope) {
if (!Scope || !Scope->getScopeNode()) if (!Scope || !Scope->getScopeNode())
return NULL; return NULL;
SmallVector <DIE *, 8> Children;
// Collect lexical scope childrens first.
const SmallVector<DbgVariable *, 8> &Variables = Scope->getDbgVariables();
for (unsigned i = 0, N = Variables.size(); i < N; ++i)
if (DIE *Variable = constructVariableDIE(Variables[i], Scope))
Children.push_back(Variable);
const SmallVector<DbgScope *, 4> &Scopes = Scope->getScopes();
for (unsigned j = 0, M = Scopes.size(); j < M; ++j)
if (DIE *Nested = constructScopeDIE(Scopes[j]))
Children.push_back(Nested);
DIScope DS(Scope->getScopeNode()); DIScope DS(Scope->getScopeNode());
DIE *ScopeDIE = NULL; DIE *ScopeDIE = NULL;
if (Scope->getInlinedAt()) if (Scope->getInlinedAt())
@ -1815,26 +1825,19 @@ DIE *DwarfDebug::constructScopeDIE(DbgScope *Scope) {
else else
ScopeDIE = updateSubprogramScopeDIE(DS); ScopeDIE = updateSubprogramScopeDIE(DS);
} }
else else {
// There is no need to emit empty lexical block DIE.
if (Children.empty())
return NULL;
ScopeDIE = constructLexicalScopeDIE(Scope); ScopeDIE = constructLexicalScopeDIE(Scope);
}
if (!ScopeDIE) return NULL; if (!ScopeDIE) return NULL;
// Add variables to scope. // Add children
const SmallVector<DbgVariable *, 8> &Variables = Scope->getDbgVariables(); for (SmallVector<DIE *, 8>::iterator I = Children.begin(),
for (unsigned i = 0, N = Variables.size(); i < N; ++i) { E = Children.end(); I != E; ++I)
DIE *VariableDIE = constructVariableDIE(Variables[i], Scope); ScopeDIE->addChild(*I);
if (VariableDIE)
ScopeDIE->addChild(VariableDIE);
}
// Add nested scopes.
const SmallVector<DbgScope *, 4> &Scopes = Scope->getScopes();
for (unsigned j = 0, M = Scopes.size(); j < M; ++j) {
// Define the Scope debug information entry.
DIE *NestedDIE = constructScopeDIE(Scopes[j]);
if (NestedDIE)
ScopeDIE->addChild(NestedDIE);
}
if (DS.isSubprogram()) if (DS.isSubprogram())
addPubTypes(DISubprogram(DS)); addPubTypes(DISubprogram(DS));