https://github.com/JDevlieghere created https://github.com/llvm/llvm-project/pull/207043
SourceManager::GetDefaultFileAndLine locates the executable's main to pick a default source file, used for input like "break set -l N" with no file specified. It searched for main by full name, but a function's linkage name can differ from its source name, in which case a full-name search for "main" does not find it and no default file is chosen. For example, wasi-libc renames main to __main_argc_argv, so on WebAssembly the debug function for main was never matched and "break set -l N" failed with "no default file available". Search by base name instead. The base name is "main" regardless of the linkage name, and where the two coincide the behavior is unchanged. >From cebd971d1866bea6857e2a278b23f95ed8b20b6a Mon Sep 17 00:00:00 2001 From: Jonas Devlieghere <[email protected]> Date: Wed, 1 Jul 2026 10:59:36 -0700 Subject: [PATCH] [lldb] Find the default source file's main by base name SourceManager::GetDefaultFileAndLine locates the executable's main to pick a default source file, used for input like "break set -l N" with no file specified. It searched for main by full name, but a function's linkage name can differ from its source name, in which case a full-name search for "main" does not find it and no default file is chosen. For example, wasi-libc renames main to __main_argc_argv, so on WebAssembly the debug function for main was never matched and "break set -l N" failed with "no default file available". Search by base name instead. The base name is "main" regardless of the linkage name, and where the two coincide the behavior is unchanged. --- lldb/source/Core/SourceManager.cpp | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/lldb/source/Core/SourceManager.cpp b/lldb/source/Core/SourceManager.cpp index d3e1bb5d332f0..af73a2c571c0f 100644 --- a/lldb/source/Core/SourceManager.cpp +++ b/lldb/source/Core/SourceManager.cpp @@ -429,8 +429,11 @@ SourceManager::GetDefaultFileAndLine() { function_options.include_symbols = false; // Force it to be a debug symbol. function_options.include_inlines = true; + // The linkage name can differ from the source name, so match on the + // base name to find the function regardless of how it was mangled or + // renamed. executable_ptr->FindFunctions(main_name, CompilerDeclContext(), - lldb::eFunctionNameTypeFull, + lldb::eFunctionNameTypeBase, function_options, sc_list); for (const SymbolContext &sc : sc_list) { if (sc.function) { _______________________________________________ lldb-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
