Commit 184157a - toy-debugger

Add command-line option to set startup breakpoints

Author	Mitja Felicijan <mitja.felicijan@gmail.com>	2026-01-17 02:21:19 +0100
Committer	Mitja Felicijan <mitja.felicijan@gmail.com>	2026-01-17 02:21:19 +0100
Commit	`184157ac185c981d9511e7a36ba21d35f29c0032` (patch)

`-rw-r--r--`	README.md	7
`-rw-r--r--`	tdbg.cpp	16

2 files changed, 21 insertions, 2 deletions



./tdbg ./example -e MYENV=qwe -- arg1 arg2 arg3
```
  
Example with breakpoints:
  
```sh
./tdbg ./example -b main
./tdbg ./example -b example.c:54 -b example.c:60
```
  
### Interactive Commands
  
| Key | Action                                                            |


 int main(int argc, char** argv) {
 	std::vector<std::string> target_env;
+	std::vector<std::string> startup_breakpoints;
 	std::vector<std::string> debuggee_args;
 	std::string target_path;
 		std::string arg = argv[i];
 		if (arg == "-e" && i + 1 < argc) {
 			target_env.push_back(argv[++i]);
+		} else if (arg == "-b" && i + 1 < argc) {
+			startup_breakpoints.push_back(argv[++i]);
 		} else if (arg == "--") {
 			for (int j = i + 1; j < argc; ++j) {
 				debuggee_args.push_back(argv[j]);
 	}
 	if (target_path.empty()) {
-		std::cerr << "Usage: " << argv[0] << " [-e KEY=VALUE] ... <target_executable> [-- arg1 arg2 ...]\n";
+		std::cerr << "Usage: " << argv[0] << " [-e KEY=VALUE] [-b BREAKPOINT] ... <target_executable> [-- arg1 arg2 ...]\n";
 		return 1;
 	}
 		return 1;
 	}
+	std::vector<std::string> log_buffer;
+	for (const auto& bp_spec : startup_breakpoints) {
+		SBBreakpoint bp = create_breakpoint(target, bp_spec);
+		if (bp.IsValid() && bp.GetNumLocations() > 0) {
+			log_msg(log_buffer, "Set startup breakpoint: " + bp_spec);
+		} else {
+			log_msg(log_buffer, "Failed to set startup breakpoint: " + bp_spec);
+		}
+	}
 	SBProcess process;
 	SBThread thread;
 	InputMode mode = INPUT_MODE_NORMAL;
 	std::string input_buffer;
 	std::string current_source_filename;
-	std::vector<std::string> log_buffer;
 	std::vector<std::string> watch_expressions;
 	int log_scroll_offset = 0;
 	int locals_scroll_offset = 0;

diff --git a/README.md b/README.md
...
33	./tdbg ./example -e MYENV=qwe -- arg1 arg2 arg3	33	./tdbg ./example -e MYENV=qwe -- arg1 arg2 arg3
34	```	34	```
35		35
		36	Example with breakpoints:
		37
		38	```sh
		39	./tdbg ./example -b main
		40	./tdbg ./example -b example.c:54 -b example.c:60
		41	```
		42
36	### Interactive Commands	43	### Interactive Commands
37		44
38	\| Key \| Action \|	45	\| Key \| Action \|
...