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Return a SwiftArrayEmptyBufferHandler if loc points to an EmptyArray Symbol. #10920

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Merged
merged 1 commit into from
Jul 25, 2025
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Return a SwiftArrayEmptyBufferHandler if loc points to an EmptyArray Symbol. #10920

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38 changes: 38 additions & 0 deletions lldb/source/Plugins/Language/Swift/SwiftArray.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,9 @@

#include "Plugins/LanguageRuntime/Swift/SwiftLanguageRuntime.h"
#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
#include "Plugins/TypeSystem/Swift/SwiftDemangle.h"
#include "Plugins/TypeSystem/Swift/TypeSystemSwiftTypeRef.h"
#include "lldb/Core/Address.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
Expand All @@ -23,6 +25,7 @@
// FIXME: we should not need this
#include "Plugins/Language/ObjC/Cocoa.h"
#include "lldb/lldb-enumerations.h"
#include "swift/Demangling/Demangler.h"

using namespace lldb;
using namespace lldb_private;
Expand Down Expand Up @@ -460,6 +463,41 @@ SwiftArrayBufferHandler::CreateBufferHandler(ValueObject &static_valobj) {
lldb::addr_t storage_location =
buffer_sp->GetValueAsUnsigned(LLDB_INVALID_ADDRESS);

lldb_private::Address addr = Address();
addr.SetLoadAddress(storage_location, exe_ctx.GetTargetPtr());

// If the storage_location points to a swiftEmptyArrayStorage symbol, return
// a SwiftArrayEmptyBufferHandler.
if (auto *symbol = addr.CalculateSymbolContextSymbol()) {
auto mangledName = symbol->GetMangled().GetMangledName().GetStringRef();
using namespace ::swift::Demangle;
Demangler dem;
NodePointer node = dem.demangleSymbol(mangledName);
if (node && swift_demangle::NodeAtPath(node, Node::Kind::Global)) {
auto *class_node = swift_demangle::ChildAtPath(
node,
{Node::Kind::TypeMetadata, Node::Kind::Type, Node::Kind::Class});
if (class_node && class_node->getNumChildren() == 2) {
auto *module_node = class_node->getFirstChild();
auto *ident_node = class_node->getLastChild();
if (module_node->getKind() == Node::Kind::Module &&
module_node->hasText() &&
ident_node->getKind() == Node::Kind::Identifier &&
ident_node->hasText()) {
auto module_name = module_node->getText();
auto class_name = ident_node->getText();
if (module_name == ::swift::STDLIB_NAME &&
class_name == "__EmptyArrayStorage") {
CompilerType elem_type(
valobj.GetCompilerType().GetArrayElementType(exe_scope));
return std::unique_ptr<SwiftArrayBufferHandler>(
new SwiftArrayEmptyBufferHandler(elem_type));
}
}
}
}
}

if (storage_location != LLDB_INVALID_ADDRESS) {
ProcessSP process_sp(valobj.GetProcessSP());
if (!process_sp)
Expand Down