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[clang][clang-scan-deps] Add named modules to format 'experimental-full' #145221

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Merged
merged 7 commits into from
Jun 24, 2025
Merged

[clang][clang-scan-deps] Add named modules to format 'experimental-full' #145221

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981742e
[clang][clang-scan-deps] Add named modules to format 'experimental-full'
naveen-seth Jun 21, 2025
08b470d
Omit 'named-module-deps: […]' when empty to avoid updating all tests
naveen-seth Jun 23, 2025
1b4e90e
Avoid implicit conversion in non-empty check
naveen-seth Jun 23, 2025
2cde5be
"module-name" -> "named-module"
naveen-seth Jun 23, 2025
2628a65
Let consumers decide whether to handle named module scan results
naveen-seth Jun 23, 2025
868934a
Fix wording mistake in comment
naveen-seth Jun 24, 2025
74772e0
Make test windows-compatible
naveen-seth Jun 24, 2025
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14 changes: 14 additions & 0 deletions clang/include/clang/Tooling/DependencyScanning/DependencyScanningTool.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
#include "clang/Tooling/JSONCompilationDatabase.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/STLExtras.h"
#include <functional>
#include <optional>
#include <string>
Expand Down Expand Up @@ -56,6 +57,9 @@ struct TranslationUnitDeps {
/// determined that the differences are benign for this compilation.
std::vector<ModuleID> ClangModuleDeps;

/// A list of the C++20 named modules this translation unit depends on.
std::vector<std::string> NamedModuleDeps;

/// The sequence of commands required to build the translation unit. Commands
/// should be executed in order.
///
Expand Down Expand Up @@ -188,13 +192,23 @@ class FullDependencyConsumer : public DependencyConsumer {
ContextHash = std::move(Hash);
}

void handleProvidedAndRequiredStdCXXModules(
std::optional<P1689ModuleInfo> Provided,
std::vector<P1689ModuleInfo> Requires) override {
ModuleName = Provided ? Provided->ModuleName : "";
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Static analysis flagged code around here and I am stuck trying to understand what ModuleName is being used for here. Is this dead code? If not there should really be a comment explaining how it is used.

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@naveen-seth naveen-seth Aug 14, 2025 •
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ModuleName stores the name of the exported standard C++ module.
After takeTranslationUnitDeps(), it is stored in the TranslationUnitDeps.ID.ModuleName field (here).

I don't think this should be dead code because it is used in ClangScanDeps.cpp when using the --experimental-full format (first reassigned here, then used for printing here).

Maybe it would help improve clarity if we keep ContextHash and ModuleName together in a ModuleID field within FullDependencyConsumer, just as TranslationUnitDeps does, rather than keeping them ungrouped.
This would then more directly lead to the documentation of ModuleID.ModuleName (here).

llvm::transform(Requires, std::back_inserter(NamedModuleDeps),
[](const auto &Module) { return Module.ModuleName; });
}

TranslationUnitDeps takeTranslationUnitDeps();
ModuleDepsGraph takeModuleGraphDeps();

private:
std::vector<std::string> Dependencies;
std::vector<PrebuiltModuleDep> PrebuiltModuleDeps;
llvm::MapVector<ModuleID, ModuleDeps> ClangModuleDeps;
std::string ModuleName;
std::vector<std::string> NamedModuleDeps;
std::vector<ModuleID> DirectModuleDeps;
std::vector<Command> Commands;
std::string ContextHash;
Expand Down
2 changes: 2 additions & 0 deletions clang/lib/Tooling/DependencyScanning/DependencyScanningTool.cpp
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Expand Up @@ -171,6 +171,8 @@ TranslationUnitDeps FullDependencyConsumer::takeTranslationUnitDeps() {
TranslationUnitDeps TU;

TU.ID.ContextHash = std::move(ContextHash);
TU.ID.ModuleName = std::move(ModuleName);
TU.NamedModuleDeps = std::move(NamedModuleDeps);
TU.FileDeps = std::move(Dependencies);
TU.PrebuiltModuleDeps = std::move(PrebuiltModuleDeps);
TU.Commands = std::move(Commands);
Expand Down
5 changes: 2 additions & 3 deletions clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
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Expand Up @@ -714,9 +714,8 @@ void ModuleDepCollectorPP::EndOfMainFile() {

MDC.Consumer.handleDependencyOutputOpts(*MDC.Opts);

if (MDC.Service.getFormat() == ScanningOutputFormat::P1689)
MDC.Consumer.handleProvidedAndRequiredStdCXXModules(
MDC.ProvidedStdCXXModule, MDC.RequiredStdCXXModules);
MDC.Consumer.handleProvidedAndRequiredStdCXXModules(
MDC.ProvidedStdCXXModule, MDC.RequiredStdCXXModules);

for (auto &&I : MDC.ModularDeps)
MDC.Consumer.handleModuleDependency(*I.second);
Expand Down
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