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precompile and cache Carbon prelude (#7432)

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Refactors the link driver to automatically compile and cache the carbon
prelude for use in linking.

Implements a `carbon_library` rule for compiling the Core library
dependencies in the examples.
This commit is contained in:
Lucile Rose Nihlen
2026-07-16 18:02:14 +00:00
committed by GitHub
parent 90f6654b48
commit 625f2ca629
63 changed files with 1454 additions and 634 deletions
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toolchain/testing/file_test.cpp
+21 -2
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@@ -47,6 +47,9 @@ struct SharedTestData {
// Files in the prelude.
llvm::SmallVector<std::string> prelude_files;
// Files in core not in the prelude.
llvm::SmallVector<std::string> core_files;
// The installed files that tests can use.
llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> file_system =
new llvm::vfs::InMemoryFileSystem();
@@ -63,6 +66,12 @@ static auto GetSharedTestData(llvm::StringRef exe_path)
CARBON_RETURN_IF_ERROR(AddFile(*data.file_system, file));
}
CARBON_ASSIGN_OR_RETURN(data.core_files,
data.installation.ReadCarbonCoreManifest());
for (const auto& file : data.core_files) {
CARBON_RETURN_IF_ERROR(AddFile(*data.file_system, file));
}
llvm::SmallVector<std::string> clang_header_files;
CARBON_ASSIGN_OR_RETURN(clang_header_files,
data.installation.ReadClangHeadersManifest());
@@ -166,6 +175,7 @@ auto ToolchainFileTest::Run(
if (component_ == "check" || component_ == "lower") {
filtered_test_args.reserve(test_args.size());
bool found_prelude_flag = false;
bool found_include_core_flag = false;
for (auto arg : test_args) {
bool driver_flag = arg == "--custom-core" || arg == "--no-prelude-import";
// A flag specified by a test prelude to indicate the intention to include
@@ -174,7 +184,9 @@ auto ToolchainFileTest::Run(
if (driver_flag || full_prelude) {
found_prelude_flag = true;
}
if (!full_prelude) {
bool include_core = arg == "--include-carbon-core";
found_include_core_flag |= include_core;
if (!full_prelude && !include_core) {
filtered_test_args.push_back(arg);
}
}
@@ -183,6 +195,13 @@ auto ToolchainFileTest::Run(
"Include a prelude from //toolchain/testing/testdata/min_prelude "
"to specify what should be imported into the test.");
}
// The compile driver includes the carbon-core by default, but we invert
// this logic for the check and lower phases, meaning we detect the presence
// of `--include-carbon-core` in the arguments, and unless that is there
// we automatically append the `--no-include-carbon-core` flag.
if (!found_include_core_flag) {
filtered_test_args.push_back("--no-include-carbon-core");
}
} else {
filtered_test_args = test_args;
}
@@ -266,7 +285,7 @@ auto ToolchainFileTest::GetDefaultArgs() const
} else if (component_ == "lower") {
args.insert(args.end(), {"--dump-llvm-ir", "--target=x86_64-linux-gnu"});
} else if (component_ == "codegen") {
// codegen tests specify flags as needed.
args.insert(args.end(), {"--no-include-carbon-core"});
} else {
CARBON_FATAL("Unexpected test component {0}: {1}", component_, test_name());
}