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[lldb] Upgrade GetIndexOfChildWithName to use llvm::Expected #136693

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Merged
merged 17 commits into from
Apr 30, 2025
Merged

[lldb] Upgrade GetIndexOfChildWithName to use llvm::Expected #136693

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f7d5ef8
[lldb] Upgrade GetIndexOfChildWithName to use llvm::Expected
charles-zablit Apr 22, 2025
db12ff1
fixup! [lldb] Upgrade GetIndexOfChildWithName to use llvm::Expected
charles-zablit Apr 22, 2025
4dda702
fix tests
charles-zablit Apr 23, 2025
320301d
fixup! fix tests
charles-zablit Apr 23, 2025
14b5250
use PRIu32 instead of %d
charles-zablit Apr 24, 2025
86f52fa
address comments
charles-zablit Apr 24, 2025
a35fea8
Update lldb/source/Plugins/Language/CPlusPlus/LibCxxVector.cpp
charles-zablit Apr 24, 2025
8d13ebb
Update lldb/source/ValueObject/ValueObjectSyntheticFilter.cpp
charles-zablit Apr 24, 2025
dcfe07b
Update lldb/source/Plugins/Language/CPlusPlus/LibCxxValarray.cpp
charles-zablit Apr 24, 2025
443b930
Update lldb/source/Plugins/Language/CPlusPlus/LibCxxVector.cpp
charles-zablit Apr 24, 2025
8d14f51
fix formatting
charles-zablit Apr 24, 2025
8ce502e
fix formatting
charles-zablit Apr 24, 2025
ac7cf1f
fix tests
charles-zablit Apr 24, 2025
3cf13ec
fixup! fix tests
charles-zablit Apr 24, 2025
4699999
fixup! fixup! fix tests
charles-zablit Apr 24, 2025
3db059d
switch to generic error message
charles-zablit Apr 29, 2025
23545b8
fixup! switch to generic error message
charles-zablit Apr 29, 2025
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13 changes: 8 additions & 5 deletions lldb/include/lldb/DataFormatters/TypeSynthetic.h
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Expand Up @@ -51,7 +51,7 @@ class SyntheticChildrenFrontEnd {

virtual lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) = 0;

virtual size_t GetIndexOfChildWithName(ConstString name) = 0;
virtual llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) = 0;

/// This function is assumed to always succeed and if it fails, the front-end
/// should know to deal with it in the correct way (most probably, by refusing
Expand Down Expand Up @@ -117,8 +117,11 @@ class SyntheticValueProviderFrontEnd : public SyntheticChildrenFrontEnd {

lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override { return nullptr; }

size_t GetIndexOfChildWithName(ConstString name) override {
return UINT32_MAX;
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override {
return llvm::createStringError(
"'SyntheticChildrenFrontEnd::SyntheticValueProviderFrontEnd' cannot "
"find index of child '%s'",
name.AsCString());
}

lldb::ChildCacheState Update() override {
Expand Down Expand Up @@ -343,7 +346,7 @@ class TypeFilterImpl : public SyntheticChildren {

bool MightHaveChildren() override { return filter->GetCount() > 0; }

size_t GetIndexOfChildWithName(ConstString name) override;
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override;

typedef std::shared_ptr<SyntheticChildrenFrontEnd> SharedPointer;

Expand Down Expand Up @@ -442,7 +445,7 @@ class ScriptedSyntheticChildren : public SyntheticChildren {

bool MightHaveChildren() override;

size_t GetIndexOfChildWithName(ConstString name) override;
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override;

lldb::ValueObjectSP GetSyntheticValue() override;

Expand Down
2 changes: 1 addition & 1 deletion lldb/include/lldb/DataFormatters/VectorIterator.h
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Expand Up @@ -30,7 +30,7 @@ class VectorIteratorSyntheticFrontEnd : public SyntheticChildrenFrontEnd {

lldb::ChildCacheState Update() override;

size_t GetIndexOfChildWithName(ConstString name) override;
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override;

private:
ExecutionContextRef m_exe_ctx_ref;
Expand Down
6 changes: 4 additions & 2 deletions lldb/include/lldb/Interpreter/ScriptInterpreter.h
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Expand Up @@ -368,10 +368,12 @@ class ScriptInterpreter : public PluginInterface {
return lldb::ValueObjectSP();
}

virtual int
virtual llvm::Expected<int>
GetIndexOfChildWithName(const StructuredData::ObjectSP &implementor,
const char *child_name) {
return UINT32_MAX;
return llvm::createStringError(
"'PluginInterface::ScriptInterpreter' cannot find index of child '%s'",
child_name);
}

virtual bool
Expand Down
5 changes: 3 additions & 2 deletions lldb/include/lldb/Symbol/CompilerType.h
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Expand Up @@ -444,8 +444,9 @@ class CompilerType {

/// Lookup a child given a name. This function will match base class names and
/// member member names in "clang_type" only, not descendants.
uint32_t GetIndexOfChildWithName(llvm::StringRef name,
bool omit_empty_base_classes) const;
llvm::Expected<uint32_t>
GetIndexOfChildWithName(llvm::StringRef name,
bool omit_empty_base_classes) const;

/// Lookup a child member given a name. This function will match member names
/// only and will descend into "clang_type" children in search for the first
Expand Down
9 changes: 6 additions & 3 deletions lldb/include/lldb/Symbol/TypeSystem.h
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Expand Up @@ -373,9 +373,12 @@ class TypeSystem : public PluginInterface,
bool &child_is_base_class, bool &child_is_deref_of_parent,
ValueObject *valobj, uint64_t &language_flags) = 0;

virtual uint32_t GetIndexOfChildWithName(lldb::opaque_compiler_type_t type,
llvm::StringRef name,
bool omit_empty_base_classes) = 0;
// Lookup a child given a name. This function will match base class names and
// member member names in "clang_type" only, not descendants.
virtual llvm::Expected<uint32_t>
GetIndexOfChildWithName(lldb::opaque_compiler_type_t type,
llvm::StringRef name,
bool omit_empty_base_classes) = 0;

virtual size_t GetIndexOfChildMemberWithName(
lldb::opaque_compiler_type_t type, llvm::StringRef name,
Expand Down
2 changes: 1 addition & 1 deletion lldb/include/lldb/ValueObject/ValueObject.h
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Expand Up @@ -498,7 +498,7 @@ class ValueObject {
virtual lldb::ValueObjectSP GetChildMemberWithName(llvm::StringRef name,
bool can_create = true);

virtual size_t GetIndexOfChildWithName(llvm::StringRef name);
virtual llvm::Expected<size_t> GetIndexOfChildWithName(llvm::StringRef name);

llvm::Expected<uint32_t> GetNumChildren(uint32_t max = UINT32_MAX);
/// Like \c GetNumChildren but returns 0 on error. You probably
Expand Down
2 changes: 1 addition & 1 deletion lldb/include/lldb/ValueObject/ValueObjectRegister.h
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Expand Up @@ -52,7 +52,7 @@ class ValueObjectRegisterSet : public ValueObject {
lldb::ValueObjectSP GetChildMemberWithName(llvm::StringRef name,
bool can_create = true) override;

size_t GetIndexOfChildWithName(llvm::StringRef name) override;
llvm::Expected<size_t> GetIndexOfChildWithName(llvm::StringRef name) override;

protected:
bool UpdateValue() override;
Expand Down
2 changes: 1 addition & 1 deletion lldb/include/lldb/ValueObject/ValueObjectSyntheticFilter.h
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Expand Up @@ -57,7 +57,7 @@ class ValueObjectSynthetic : public ValueObject {
lldb::ValueObjectSP GetChildMemberWithName(llvm::StringRef name,
bool can_create = true) override;

size_t GetIndexOfChildWithName(llvm::StringRef name) override;
llvm::Expected<size_t> GetIndexOfChildWithName(llvm::StringRef name) override;

lldb::ValueObjectSP
GetDynamicValue(lldb::DynamicValueType valueType) override;
Expand Down
8 changes: 5 additions & 3 deletions lldb/source/API/SBValue.cpp
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Expand Up @@ -704,13 +704,15 @@ SBValue SBValue::GetChildAtIndex(uint32_t idx,
uint32_t SBValue::GetIndexOfChildWithName(const char *name) {
LLDB_INSTRUMENT_VA(this, name);

uint32_t idx = UINT32_MAX;
ValueLocker locker;
lldb::ValueObjectSP value_sp(GetSP(locker));
if (value_sp) {
idx = value_sp->GetIndexOfChildWithName(name);
if (auto idx_or_err = value_sp->GetIndexOfChildWithName(name))
return *idx_or_err;
else
llvm::consumeError(idx_or_err.takeError());
}
return idx;
return UINT32_MAX;
}

SBValue SBValue::GetChildMemberWithName(const char *name) {
Expand Down
6 changes: 5 additions & 1 deletion lldb/source/DataFormatters/FormatterBytecode.cpp
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Expand Up @@ -9,6 +9,7 @@
#include "FormatterBytecode.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/ValueObject/ValueObject.h"
#include "lldb/ValueObject/ValueObjectConstResult.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Format.h"
Expand Down Expand Up @@ -489,7 +490,10 @@ llvm::Error Interpret(std::vector<ControlStackElement> &control,
TYPE_CHECK(Object, String);
auto name = data.Pop<std::string>();
POP_VALOBJ(valobj);
data.Push((uint64_t)valobj->GetIndexOfChildWithName(name));
if (auto index_or_err = valobj->GetIndexOfChildWithName(name))
data.Push((uint64_t)*index_or_err);
else
return index_or_err.takeError();
break;
}
case sel_get_type: {
Expand Down
14 changes: 9 additions & 5 deletions lldb/source/DataFormatters/TypeSynthetic.cpp
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Expand Up @@ -49,7 +49,7 @@ bool TypeFilterImpl::SetExpressionPathAtIndex(size_t i,
return true;
}

size_t
llvm::Expected<size_t>
TypeFilterImpl::FrontEnd::GetIndexOfChildWithName(ConstString name) {
const char *name_cstr = name.GetCString();
if (name_cstr) {
Expand All @@ -67,7 +67,9 @@ TypeFilterImpl::FrontEnd::GetIndexOfChildWithName(ConstString name) {
}
}
}
return UINT32_MAX;
return llvm::createStringError(
"'SyntheticChildrenFrontEnd::FrontEnd' cannot find index of child '%s'",
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Suggested change
"'SyntheticChildrenFrontEnd::FrontEnd' cannot find index of child '%s'",
"'TypeFilterImpl::FrontEnd' cannot find index of child '%s'",

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I would suggest leaving out the function name entirely.

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I initially suggested it because that'd make it easier to identify where this was coming from if we ever decide to log it (or see it in user reports)

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@Michael137 My thinking is that these error messages are meant to be read by LLDB users, and the function name is a tool to aid in debugging LLDB itself. Users won't understand the meaning of the function name here, so we shouldn't have it in the user-facing error message. If this is useful information needed to debug LLDB, then we should log it instead.
Let me know if you think that's not a good idea!

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Hmm fair question. Adding logging to all these places feels a bit noisy. In my opinion its helpful to be as specific as possible, and if we wanted to present something more generic to the user eventually then we can change the error message at the point where we are about to present it. I'm not sure where these error messages will currently show up actually

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Adding logging to all these places feels a bit noisy.

Currently the error is dropped silently. You wouldn't replace that with adding logging everywhere. My suggestion would be to:

  • return errors that are understandable to users
  • where necessary add logging in the error case with additional information

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I'm not sure where these error messages will currently show up actually

The error messages in the Expected return results of CompilerType are surfaced when formatting ValueObjects, for example.

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Hmm my main concern is that we end up getting user reports with a very generic error and then have no way to really tell where we went wrong. Then adding logging after-the-fact is a pretty slow turnaround. I guess usually these types of issues require a reproducer to debug anyway, so maybe this isn't a valid concern? Wdyt? I don't have a strong opinion on this. But it would be easier/more convenient to go from non-generic error back to generic error than the other way around if we really need to

name.AsCString());
}

std::string TypeFilterImpl::GetDescription() {
Expand Down Expand Up @@ -218,10 +220,12 @@ bool ScriptedSyntheticChildren::FrontEnd::MightHaveChildren() {
return m_interpreter->MightHaveChildrenSynthProviderInstance(m_wrapper_sp);
}

size_t ScriptedSyntheticChildren::FrontEnd::GetIndexOfChildWithName(
ConstString name) {
llvm::Expected<size_t>
ScriptedSyntheticChildren::FrontEnd::GetIndexOfChildWithName(ConstString name) {
if (!m_wrapper_sp || m_interpreter == nullptr)
return UINT32_MAX;
return llvm::createStringError(
"'ScriptedSyntheticChildren::FrontEnd' cannot find index of child '%s'",
name.AsCString());
return m_interpreter->GetIndexOfChildWithName(m_wrapper_sp,
name.GetCString());
}
Expand Down
10 changes: 7 additions & 3 deletions lldb/source/DataFormatters/VectorType.cpp
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Expand Up @@ -269,11 +269,15 @@ class VectorTypeSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
return lldb::ChildCacheState::eRefetch;
}

size_t GetIndexOfChildWithName(ConstString name) override {
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override {
const char *item_name = name.GetCString();
uint32_t idx = ExtractIndexFromString(item_name);
if (idx < UINT32_MAX && idx >= CalculateNumChildrenIgnoringErrors())
return UINT32_MAX;
if (idx == UINT32_MAX ||
(idx < UINT32_MAX && idx >= CalculateNumChildrenIgnoringErrors()))
return llvm::createStringError(
"'SyntheticChildrenFrontEnd::VectorTypeSyntheticFrontEnd' cannot "
"find index of child '%s'",
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Can we also print the idx that we found in the error message? (same applies to other places that do the idx >= CalculateNumChildrenIgnoringErrors comparison)

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Type has no child named '%s'

name.AsCString());
return idx;
}

Expand Down
19 changes: 15 additions & 4 deletions lldb/source/Plugins/Language/CPlusPlus/BlockPointer.cpp
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Expand Up @@ -144,9 +144,12 @@ class BlockPointerSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
return lldb::ChildCacheState::eRefetch;
}

size_t GetIndexOfChildWithName(ConstString name) override {
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override {
if (!m_block_struct_type.IsValid())
return UINT32_MAX;
return llvm::createStringError(
"'SyntheticChildrenFrontend::BlockPointerSyntheticFrontEnd' cannot "
"find index of child '%s'",
name.AsCString());

const bool omit_empty_base_classes = false;
return m_block_struct_type.GetIndexOfChildWithName(name.AsCString(),
Expand All @@ -172,8 +175,16 @@ bool lldb_private::formatters::BlockPointerSummaryProvider(

static const ConstString s_FuncPtr_name("__FuncPtr");

lldb::ValueObjectSP child_sp = synthetic_children->GetChildAtIndex(
synthetic_children->GetIndexOfChildWithName(s_FuncPtr_name));
auto index_or_err =
synthetic_children->GetIndexOfChildWithName(s_FuncPtr_name);

if (!index_or_err) {
LLDB_LOG_ERROR(GetLog(LLDBLog::Types), index_or_err.takeError(), "{0}");
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Suggested change
LLDB_LOG_ERROR(GetLog(LLDBLog::Types), index_or_err.takeError(), "{0}");
LLDB_LOG_ERROR(GetLog(LLDBLog::DataFormatters), index_or_err.takeError(), "{0}");

return false;
}

lldb::ValueObjectSP child_sp =
synthetic_children->GetChildAtIndex(*index_or_err);

if (!child_sp) {
return false;
Expand Down
14 changes: 11 additions & 3 deletions lldb/source/Plugins/Language/CPlusPlus/Coroutines.cpp
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Expand Up @@ -199,10 +199,15 @@ lldb_private::formatters::StdlibCoroutineHandleSyntheticFrontEnd::Update() {
return lldb::ChildCacheState::eRefetch;
}

size_t StdlibCoroutineHandleSyntheticFrontEnd::GetIndexOfChildWithName(
llvm::Expected<size_t>
StdlibCoroutineHandleSyntheticFrontEnd::GetIndexOfChildWithName(
ConstString name) {
if (!m_resume_ptr_sp || !m_destroy_ptr_sp)
return UINT32_MAX;
return llvm::createStringError(
"'SyntheticChildrenFrontend::StdlibCoroutineHandleSyntheticFrontEnd' "
"cannot find index of child '%s'. (m_resume_ptr_sp='%p', "
"m_destroy_ptr_sp='%p')",
name.AsCString(), m_resume_ptr_sp.get(), m_destroy_ptr_sp.get());

if (name == ConstString("resume"))
return 0;
Expand All @@ -211,7 +216,10 @@ size_t StdlibCoroutineHandleSyntheticFrontEnd::GetIndexOfChildWithName(
if (name == ConstString("promise_ptr") && m_promise_ptr_sp)
return 2;

return UINT32_MAX;
return llvm::createStringError(
"'SyntheticChildrenFrontend::StdlibCoroutineHandleSyntheticFrontEnd' "
"cannot find index of child '%s'",
name.AsCString());
}

SyntheticChildrenFrontEnd *
Expand Down
2 changes: 1 addition & 1 deletion lldb/source/Plugins/Language/CPlusPlus/Coroutines.h
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Expand Up @@ -40,7 +40,7 @@ class StdlibCoroutineHandleSyntheticFrontEnd

lldb::ChildCacheState Update() override;

size_t GetIndexOfChildWithName(ConstString name) override;
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override;

private:
lldb::ValueObjectSP m_resume_ptr_sp;
Expand Down
11 changes: 9 additions & 2 deletions lldb/source/Plugins/Language/CPlusPlus/GenericBitset.cpp
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Expand Up @@ -28,8 +28,15 @@ class GenericBitsetFrontEnd : public SyntheticChildrenFrontEnd {

GenericBitsetFrontEnd(ValueObject &valobj, StdLib stdlib);

size_t GetIndexOfChildWithName(ConstString name) override {
return formatters::ExtractIndexFromString(name.GetCString());
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override {
size_t idx = formatters::ExtractIndexFromString(name.GetCString());
if (idx == UINT32_MAX) {
return llvm::createStringError(
"'SyntheticChildrenFrontend::GenericBitsetFrontEnd' cannot find "
"index of child '%s'",
name.AsCString());
}
return idx;
}

lldb::ChildCacheState Update() override;
Expand Down
11 changes: 9 additions & 2 deletions lldb/source/Plugins/Language/CPlusPlus/GenericOptional.cpp
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Expand Up @@ -36,10 +36,17 @@ class GenericOptionalFrontend : public SyntheticChildrenFrontEnd {

GenericOptionalFrontend(ValueObject &valobj, StdLib stdlib);

size_t GetIndexOfChildWithName(ConstString name) override {
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override {
if (name == "$$dereference$$")
return 0;
return formatters::ExtractIndexFromString(name.GetCString());
size_t idx = formatters::ExtractIndexFromString(name.GetCString());
if (idx == UINT32_MAX) {
return llvm::createStringError(
"'SyntheticChildrenFrontend::GenericOptionalFrontend' cannot find "
"index of child '%s'",
name.AsCString());
}
return idx;
}

llvm::Expected<uint32_t> CalculateNumChildren() override {
Expand Down
28 changes: 21 additions & 7 deletions lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp
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Expand Up @@ -309,13 +309,17 @@ lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::Update() {
return lldb::ChildCacheState::eRefetch;
}

size_t lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::
llvm::Expected<size_t>
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
if (name == "__ptr_")
return 0;
if (name == "$$dereference$$")
return 1;
return UINT32_MAX;
return llvm::createStringError(
"'SyntheticChildrenFrontend::LibcxxSharedPtrSyntheticFrontEnd' cannot "
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Suggested change
"'SyntheticChildrenFrontend::LibcxxSharedPtrSyntheticFrontEnd' cannot "
"'LibcxxSharedPtrSyntheticFrontEnd' cannot "

"find index of child '%s'",
name.AsCString());
}

lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::
Expand Down Expand Up @@ -407,15 +411,19 @@ lldb_private::formatters::LibcxxUniquePtrSyntheticFrontEnd::Update() {
return lldb::ChildCacheState::eRefetch;
}

size_t lldb_private::formatters::LibcxxUniquePtrSyntheticFrontEnd::
llvm::Expected<size_t>
lldb_private::formatters::LibcxxUniquePtrSyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
if (name == "pointer")
return 0;
if (name == "deleter")
return 1;
if (name == "$$dereference$$")
return 2;
return UINT32_MAX;
return llvm::createStringError(
"'ScriptedSyntheticChildren::LibcxxUniquePtrSyntheticFrontEnd' cannot "
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Suggested change
"'ScriptedSyntheticChildren::LibcxxUniquePtrSyntheticFrontEnd' cannot "
"'LibcxxUniquePtrSyntheticFrontEnd' cannot "

"find index of child '%s'",
name.AsCString());
}

bool lldb_private::formatters::LibcxxContainerSummaryProvider(
Expand Down Expand Up @@ -456,9 +464,15 @@ ExtractLibcxxStringInfo(ValueObject &valobj) {
if (!l)
return {};

StringLayout layout = l->GetIndexOfChildWithName("__data_") == 0
? StringLayout::DSC
: StringLayout::CSD;
auto index_or_err = l->GetIndexOfChildWithName("__data_");
if (!index_or_err) {
LLDB_LOG_ERROR(GetLog(LLDBLog::DataFormatters), index_or_err.takeError(),
"{0}");
return {};
}

StringLayout layout =
*index_or_err == 0 ? StringLayout::DSC : StringLayout::CSD;

bool short_mode = false; // this means the string is in short-mode and the
// data is stored inline
Expand Down
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