rupprecht created this revision. rupprecht added reviewers: cassanova, JDevlieghere, mib. Herald added a project: All. rupprecht requested review of this revision. Herald added a project: LLDB. Herald added a subscriber: lldb-commits.
The expression fuzzer checks an environment variable, `LLDB_FUZZER_TARGET`, to get the fuzzer target binary. This is fine, but internally our tooling for running fuzz tests only has proper handling for flag values. It's surprisingly complicated to add support for that, and allowing it to be passed via flag seems reasonable anyway. Repository: rG LLVM Github Monorepo https://reviews.llvm.org/D133546 Files: lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/lldb-expression-fuzzer.cpp Index: lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/lldb-expression-fuzzer.cpp =================================================================== --- lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/lldb-expression-fuzzer.cpp +++ lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/lldb-expression-fuzzer.cpp @@ -35,7 +35,7 @@ using namespace llvm; using namespace clang_fuzzer; -char *target_path; +const char *target_path = nullptr; void ReportError(llvm::StringRef message) { WithColor::error() << message << '\n'; @@ -47,7 +47,20 @@ signal(SIGPIPE, SIG_IGN); #endif - target_path = ::getenv("LLDB_FUZZER_TARGET"); + // `target_path` can be set by either the "--lldb_fuzzer_target" commandline + // flag or the "LLDB_FUZZER_TARGET" environment variable. Arbitrarily, we + // always do flag parsing and only check the environment variable if the + // commandline flag is not set. + for (int i = 1; i < *argc; ++i) { + auto this_arg = llvm::StringRef((*argv)[i]); + WithColor::note() << "argv[" << i << "] = " << this_arg << "\n"; + if (this_arg.consume_front("--lldb_fuzzer_target=")) + target_path = this_arg.data(); + } + + if (!target_path) + target_path = ::getenv("LLDB_FUZZER_TARGET"); + if (!target_path) ReportError( "no target path specified in with the LLDB_FUZZER_TARGET variable");
Index: lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/lldb-expression-fuzzer.cpp =================================================================== --- lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/lldb-expression-fuzzer.cpp +++ lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/lldb-expression-fuzzer.cpp @@ -35,7 +35,7 @@ using namespace llvm; using namespace clang_fuzzer; -char *target_path; +const char *target_path = nullptr; void ReportError(llvm::StringRef message) { WithColor::error() << message << '\n'; @@ -47,7 +47,20 @@ signal(SIGPIPE, SIG_IGN); #endif - target_path = ::getenv("LLDB_FUZZER_TARGET"); + // `target_path` can be set by either the "--lldb_fuzzer_target" commandline + // flag or the "LLDB_FUZZER_TARGET" environment variable. Arbitrarily, we + // always do flag parsing and only check the environment variable if the + // commandline flag is not set. + for (int i = 1; i < *argc; ++i) { + auto this_arg = llvm::StringRef((*argv)[i]); + WithColor::note() << "argv[" << i << "] = " << this_arg << "\n"; + if (this_arg.consume_front("--lldb_fuzzer_target=")) + target_path = this_arg.data(); + } + + if (!target_path) + target_path = ::getenv("LLDB_FUZZER_TARGET"); + if (!target_path) ReportError( "no target path specified in with the LLDB_FUZZER_TARGET variable");
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