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Debug info: Support variadic functions.

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Variadic functions have an unspecified parameter tag after the last
argument. In IR this is represented as an unspecified parameter in the
subroutine type.

Paired commit with CFE r202185.

rdar://problem/13690847

This re-applies r202184 + a bugfix in DwarfDebug's argument handling.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202188 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl
2014-02-25 19:57:42 +00:00
parent 9791b3f9ae
commit dbaa6ab8b5
5 changed files with 141 additions and 29 deletions
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32
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@@ -403,15 +403,21 @@ DIE *DwarfDebug::updateSubprogramScopeDIE(DwarfCompileUnit *SPCU,
DIArray Args = SPTy.getTypeArray();
uint16_t SPTag = SPTy.getTag();
if (SPTag == dwarf::DW_TAG_subroutine_type)
// FIXME: Use DwarfUnit::constructSubprogramArguments() here.
for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
DIE *Arg =
SPCU->createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
DIType ATy(Args.getElement(i));
SPCU->addType(Arg, ATy);
if (ATy.isArtificial())
SPCU->addFlag(Arg, dwarf::DW_AT_artificial);
if (ATy.isObjectPointer())
SPCU->addDIEEntry(SPDie, dwarf::DW_AT_object_pointer, Arg);
if (ATy.isUnspecifiedParameter()) {
assert(i == N-1 && "ellipsis must be the last argument");
SPCU->createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, *SPDie);
} else {
DIE *Arg =
SPCU->createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
SPCU->addType(Arg, ATy);
if (ATy.isArtificial())
SPCU->addFlag(Arg, dwarf::DW_AT_artificial);
if (ATy.isObjectPointer())
SPCU->addDIEEntry(SPDie, dwarf::DW_AT_object_pointer, Arg);
}
}
DIE *SPDeclDie = SPDie;
SPDie = SPCU->createAndAddDIE(dwarf::DW_TAG_subprogram,
@@ -582,7 +588,7 @@ DIE *DwarfDebug::createScopeChildrenDIE(DwarfCompileUnit *TheCU,
DIE *ObjectPointer = NULL;
// Collect arguments for current function.
if (LScopes.isCurrentFunctionScope(Scope))
if (LScopes.isCurrentFunctionScope(Scope)) {
for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
if (DbgVariable *ArgDV = CurrentFnArguments[i])
if (DIE *Arg =
@@ -592,6 +598,16 @@ DIE *DwarfDebug::createScopeChildrenDIE(DwarfCompileUnit *TheCU,
ObjectPointer = Arg;
}
// Create the unspecified parameter that marks a function as variadic.
DISubprogram SP(Scope->getScopeNode());
assert(SP.Verify());
DIArray FnArgs = SP.getType().getTypeArray();
if (FnArgs.getElement(FnArgs.getNumElements()-1).isUnspecifiedParameter()) {
DIE *Ellipsis = new DIE(dwarf::DW_TAG_unspecified_parameters);
Children.push_back(Ellipsis);
}
}
// Collect lexical scope children first.
const SmallVectorImpl<DbgVariable *> &Variables =
ScopeVariables.lookup(Scope);