DIE &DwarfCompileUnit::constructSubprogramScopeDIE(const DISubprogram *Sub,
LexicalScope *Scope) {
DIE &ScopeDIE = updateSubprogramScopeDIE(Sub);
if (Scope) {
assert(!Scope->getInlinedAt());
assert(!Scope->isAbstractScope());
// Collect lexical scope children first.
// ObjectPointer might be a local (non-argument) local variable if it's a
// block's synthetic this pointer.
if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, ScopeDIE))
addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, *ObjectPointer);
}
// If this is a variadic function, add an unspecified parameter.
DITypeRefArray FnArgs = Sub->getType()->getTypeArray();
// If we have a single element of null, it is a function that returns void.
// If we have more than one elements and the last one is null, it is a
// variadic function.
if (FnArgs.size() > 1 && !FnArgs[FnArgs.size() - 1] &&
!includeMinimalInlineScopes())
ScopeDIE.addChild(
DIE::get(DIEValueAllocator, dwarf::DW_TAG_unspecified_parameters));
return ScopeDIE;
}
LLVMMetadataRef LLVMDIBuilderGetOrCreateTypeArray(LLVMDIBuilderRef Dref,
LLVMMetadataRef *Data,
size_t Length) {
DIBuilder *D = unwrap(Dref);
Metadata **DataValue = unwrap(Data);
ArrayRef<Metadata *> Elements(DataValue, Length);
DITypeRefArray A = D->getOrCreateTypeArray(Elements);
return wrap(A.get());
}
void BTFTypeFuncProto::completeType(BTFDebug &BDebug) {
DITypeRefArray Elements = STy->getTypeArray();
auto RetType = Elements[0].resolve();
BTFType.Type = RetType ? BDebug.getTypeId(RetType) : 0;
BTFType.NameOff = 0;
// For null parameter which is typically the last one
// to represent the vararg, encode the NameOff/Type to be 0.
for (unsigned I = 1, N = Elements.size(); I < N; ++I) {
struct BTF::BTFParam Param;
auto Element = Elements[I].resolve();
if (Element) {
Param.NameOff = BDebug.addString(FuncArgNames[I]);
Param.Type = BDebug.getTypeId(Element);
} else {
Param.NameOff = 0;
Param.Type = 0;
}
Parameters.push_back(Param);
}
}
/// Handle subprogram or subroutine types.
void BTFDebug::visitSubroutineType(
const DISubroutineType *STy, bool ForSubprog,
const std::unordered_map<uint32_t, StringRef> &FuncArgNames,
uint32_t &TypeId) {
DITypeRefArray Elements = STy->getTypeArray();
uint32_t VLen = Elements.size() - 1;
if (VLen > BTF::MAX_VLEN)
return;
// Subprogram has a valid non-zero-length name, and the pointee of
// a function pointer has an empty name. The subprogram type will
// not be added to DIToIdMap as it should not be referenced by
// any other types.
auto TypeEntry = llvm::make_unique<BTFTypeFuncProto>(STy, VLen, FuncArgNames);
if (ForSubprog)
TypeId = addType(std::move(TypeEntry)); // For subprogram
else
addType(std::move(TypeEntry), STy); // For func ptr
// Visit return type and func arg types.
for (const auto Element : Elements) {
visitTypeEntry(Element.resolve());
}
}