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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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43
lib/CodeGen/AsmPrinter/DwarfUnit.cpp
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@ -1139,6 +1139,22 @@ void DwarfUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
addSourceLine(&Buffer, DTy);
}
/// constructSubprogramArguments - Construct function argument DIEs.
void DwarfUnit::constructSubprogramArguments(DIE &Buffer, DIArray Args) {
for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
DIDescriptor Ty = Args.getElement(i);
if (Ty.isUnspecifiedParameter()) {
assert(i == N-1 && "ellipsis must be the last argument");
createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
} else {
DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
addType(Arg, DIType(Ty));
if (DIType(Ty).isArtificial())
addFlag(Arg, dwarf::DW_AT_artificial);
}
}
}
/// constructTypeDIE - Construct type DIE from DICompositeType.
void DwarfUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
// Add name if not anonymous or intermediate type.
@ -1162,19 +1178,12 @@ void DwarfUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
addType(&Buffer, RTy);
bool isPrototyped = true;
// Add arguments.
for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
DIDescriptor Ty = Elements.getElement(i);
if (Ty.isUnspecifiedParameter()) {
createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
isPrototyped = false;
} else {
DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
addType(Arg, DIType(Ty));
if (DIType(Ty).isArtificial())
addFlag(Arg, dwarf::DW_AT_artificial);
}
}
if (Elements.getNumElements() == 2 &&
Elements.getElement(1).isUnspecifiedParameter())
isPrototyped = false;
constructSubprogramArguments(Buffer, Elements);
// Add prototype flag if we're dealing with a C language and the
// function has been prototyped.
uint16_t Language = getLanguage();
@ -1457,13 +1466,7 @@ DIE *DwarfUnit::getOrCreateSubprogramDIE(DISubprogram SP) {
// Add arguments. Do not add arguments for subprogram definition. They will
// be handled while processing variables.
for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
DIType ATy(Args.getElement(i));
addType(Arg, ATy);
if (ATy.isArtificial())
addFlag(Arg, dwarf::DW_AT_artificial);
}
constructSubprogramArguments(*SPDie, Args);
}
if (SP.isArtificial())