[clang] a301fb1 - [clang][modules] Print library module manifest path. (#76451)
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Mon Jan 22 10:42:36 PST 2024
Author: Mark de Wever
Date: 2024-01-22T19:42:32+01:00
New Revision: a301fb11014f9cfdf4ee8cada173c46a7677d9d3
URL: https://github.com/llvm/llvm-project/commit/a301fb11014f9cfdf4ee8cada173c46a7677d9d3
DIFF: https://github.com/llvm/llvm-project/commit/a301fb11014f9cfdf4ee8cada173c46a7677d9d3.diff
LOG: [clang][modules] Print library module manifest path. (#76451)
This implements a way for the compiler to find the modules.json
associated with the C++23 Standard library modules.
This is based on a discussion in SG15. At the moment no Standard library
installs this manifest. #75741 adds this feature in libc++.
Added:
clang/test/Driver/modules-print-library-module-manifest-path.cpp
Modified:
clang/include/clang/Driver/Driver.h
clang/include/clang/Driver/Options.td
clang/lib/Driver/Driver.cpp
Removed:
################################################################################
diff --git a/clang/include/clang/Driver/Driver.h b/clang/include/clang/Driver/Driver.h
index 3ee1bcf2a69c9b..595f104e406d37 100644
--- a/clang/include/clang/Driver/Driver.h
+++ b/clang/include/clang/Driver/Driver.h
@@ -602,6 +602,16 @@ class Driver {
// FIXME: This should be in CompilationInfo.
std::string GetProgramPath(StringRef Name, const ToolChain &TC) const;
+ /// Lookup the path to the Standard library module manifest.
+ ///
+ /// \param C - The compilation.
+ /// \param TC - The tool chain for additional information on
+ /// directories to search.
+ //
+ // FIXME: This should be in CompilationInfo.
+ std::string GetStdModuleManifestPath(const Compilation &C,
+ const ToolChain &TC) const;
+
/// HandleAutocompletions - Handle --autocomplete by searching and printing
/// possible flags, descriptions, and its arguments.
void HandleAutocompletions(StringRef PassedFlags) const;
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index f9e883e3e22de8..637b10652fcd9c 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -5306,6 +5306,9 @@ def print_resource_dir : Flag<["-", "--"], "print-resource-dir">,
def print_search_dirs : Flag<["-", "--"], "print-search-dirs">,
HelpText<"Print the paths used for finding libraries and programs">,
Visibility<[ClangOption, CLOption]>;
+def print_std_module_manifest_path : Flag<["-", "--"], "print-library-module-manifest-path">,
+ HelpText<"Print the path for the C++ Standard library module manifest">,
+ Visibility<[ClangOption, CLOption]>;
def print_targets : Flag<["-", "--"], "print-targets">,
HelpText<"Print the registered targets">,
Visibility<[ClangOption, CLOption]>;
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index da27ca2d28e91a..1c323702082301 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -2194,6 +2194,12 @@ bool Driver::HandleImmediateArgs(const Compilation &C) {
return false;
}
+ if (C.getArgs().hasArg(options::OPT_print_std_module_manifest_path)) {
+ llvm::outs() << GetStdModuleManifestPath(C, C.getDefaultToolChain())
+ << '\n';
+ return false;
+ }
+
if (C.getArgs().hasArg(options::OPT_print_runtime_dir)) {
if (std::optional<std::string> RuntimePath = TC.getRuntimePath())
llvm::outs() << *RuntimePath << '\n';
@@ -6165,6 +6171,44 @@ std::string Driver::GetProgramPath(StringRef Name, const ToolChain &TC) const {
return std::string(Name);
}
+std::string Driver::GetStdModuleManifestPath(const Compilation &C,
+ const ToolChain &TC) const {
+ std::string error = "<NOT PRESENT>";
+
+ switch (TC.GetCXXStdlibType(C.getArgs())) {
+ case ToolChain::CST_Libcxx: {
+ std::string lib = GetFilePath("libc++.so", TC);
+
+ // Note when there are multiple flavours of libc++ the module json needs to
+ // look at the command-line arguments for the proper json.
+ // These flavours do not exist at the moment, but there are plans to
+ // provide a variant that is built with sanitizer instrumentation enabled.
+
+ // For example
+ // StringRef modules = [&] {
+ // const SanitizerArgs &Sanitize = TC.getSanitizerArgs(C.getArgs());
+ // if (Sanitize.needsAsanRt())
+ // return "modules-asan.json";
+ // return "modules.json";
+ // }();
+
+ SmallString<128> path(lib.begin(), lib.end());
+ llvm::sys::path::remove_filename(path);
+ llvm::sys::path::append(path, "modules.json");
+ if (TC.getVFS().exists(path))
+ return static_cast<std::string>(path);
+
+ return error;
+ }
+
+ case ToolChain::CST_Libstdcxx:
+ // libstdc++ does not provide Standard library modules yet.
+ return error;
+ }
+
+ return error;
+}
+
std::string Driver::GetTemporaryPath(StringRef Prefix, StringRef Suffix) const {
SmallString<128> Path;
std::error_code EC = llvm::sys::fs::createTemporaryFile(Prefix, Suffix, Path);
diff --git a/clang/test/Driver/modules-print-library-module-manifest-path.cpp b/clang/test/Driver/modules-print-library-module-manifest-path.cpp
new file mode 100644
index 00000000000000..693a992876019e
--- /dev/null
+++ b/clang/test/Driver/modules-print-library-module-manifest-path.cpp
@@ -0,0 +1,36 @@
+// Test that -print-library-module-manifest-path finds the correct file.
+
+// RUN: rm -rf %t && split-file %s %t && cd %t
+// RUN: mkdir -p %t/Inputs/usr/lib/x86_64-linux-gnu
+// RUN: touch %t/Inputs/usr/lib/x86_64-linux-gnu/libc++.so
+
+// RUN: %clang -print-library-module-manifest-path \
+// RUN: -stdlib=libc++ \
+// RUN: --sysroot=%t/Inputs \
+// RUN: --target=x86_64-linux-gnu 2>&1 \
+// RUN: | FileCheck libcxx-no-module-json.cpp
+
+// RUN: touch %t/Inputs/usr/lib/x86_64-linux-gnu/modules.json
+// RUN: %clang -print-library-module-manifest-path \
+// RUN: -stdlib=libc++ \
+// RUN: --sysroot=%t/Inputs \
+// RUN: --target=x86_64-linux-gnu 2>&1 \
+// RUN: | FileCheck libcxx.cpp
+
+// RUN: %clang -print-library-module-manifest-path \
+// RUN: -stdlib=libstdc++ \
+// RUN: --sysroot=%t/Inputs \
+// RUN: --target=x86_64-linux-gnu 2>&1 \
+// RUN: | FileCheck libstdcxx.cpp
+
+//--- libcxx-no-module-json.cpp
+
+// CHECK: <NOT PRESENT>
+
+//--- libcxx.cpp
+
+// CHECK: {{.*}}/Inputs/usr/lib/x86_64-linux-gnu{{/|\\}}modules.json
+
+//--- libstdcxx.cpp
+
+// CHECK: <NOT PRESENT>
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