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Switch to BumpPtrAllocator for C-string storage (#6550)

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This keeps the allocations cheap and simplifies the code. It was
inspired by the need to expand param files, but
no functionality changed yet.
This commit is contained in:
Chandler Carruth
2026-01-07 02:53:31 +00:00
committed by GitHub
parent 505b1c86b9
commit eecbb7e508
7 changed files with 34 additions and 44 deletions
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toolchain/driver/clang_runner.cpp
+3 -4
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@@ -237,14 +237,13 @@ auto ClangRunner::RunInternal(
std::optional<std::filesystem::path> libunwind_path,
std::optional<std::filesystem::path> libcxx_path, bool enable_leaking)
-> bool {
// Rebuild the args as C-string args.
llvm::OwningArrayRef<char> cstr_arg_storage;
llvm::BumpPtrAllocator alloc;
// Handle special dispatch for CC1 commands as they don't use the driver and
// we don't synthesize any default arguments there.
if (!args.empty() && args[0].starts_with("-cc1")) {
llvm::SmallVector<const char*, 64> cstr_args =
BuildCStrArgs(clang_path_.native(), args, cstr_arg_storage);
BuildCStrArgs(clang_path_.native(), args, alloc);
if (args[0] == "-cc1") {
CARBON_VLOG("Dispatching `-cc1` command line...");
int exit_code =
@@ -297,7 +296,7 @@ auto ClangRunner::RunInternal(
// Rebuild the args as C-string args.
llvm::SmallVector<const char*, 64> cstr_args =
BuildCStrArgs(clang_path_.native(), prefix_args, args, cstr_arg_storage);
BuildCStrArgs(clang_path_.native(), prefix_args, args, alloc);
CARBON_VLOG("Running Clang driver with the following arguments:\n");
for (const char* cstr_arg : llvm::ArrayRef(cstr_args)) {