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-rw-r--r--gold/main.cc88
1 files changed, 87 insertions, 1 deletions
diff --git a/gold/main.cc b/gold/main.cc
index 507e5dd..5112223 100644
--- a/gold/main.cc
+++ b/gold/main.cc
@@ -39,6 +39,85 @@
using namespace gold;
+// This function emits the commandline to a hard-coded file in temp.
+// This is useful for debugging since ld is typically invoked by gcc,
+// so its commandline is not always easy to extract. You should be
+// able to run 'gcc -B... foo.o -o foo' to invoke this linker the
+// first time, and then /tmp/ld-run-foo.sh to invoke it on subsequent
+// runes. "/tmp/ld-run-foo.sh debug" will run the linker inside gdb
+// (or whatever value the environment variable GDB is set to), for
+// even easier debugging. Since this is a debugging-only tool, and
+// creates files, it is only turned on when the user explicitly asks
+// for it, by compiling with -DDEBUG. Do not do this for release
+// versions of the linker!
+
+#ifdef DEBUG
+#include <stdio.h>
+#include <sys/stat.h> // for chmod()
+
+static std::string
+collect_argv(int argc, char** argv)
+{
+ // This is used by write_debug_script(), which wants the unedited argv.
+ std::string args;
+ for (int i = 0; i < argc; ++i)
+ {
+ args.append(" '");
+ // Now append argv[i], but with all single-quotes escaped
+ const char* argpos = argv[i];
+ while (1)
+ {
+ const int len = strcspn(argpos, "'");
+ args.append(argpos, len);
+ if (argpos[len] == '\0')
+ break;
+ args.append("'\"'\"'");
+ argpos += len + 1;
+ }
+ args.append("'");
+ }
+ return args;
+}
+
+static void
+write_debug_script(std::string filename_str,
+ const char* argv_0, const char* args)
+{
+ size_t slash = filename_str.rfind('/');
+ if (slash != std::string::npos)
+ filename_str = filename_str.c_str() + slash + 1;
+ filename_str = std::string("/var/tmp/ld-run-") + filename_str + ".sh";
+ const char* filename = filename_str.c_str();
+ FILE* fp = fopen(filename, "w");
+ if (fp)
+ {
+ fprintf(fp, "[ \"$1\" = debug ] && PREFIX=\"${GDB-/home/build/static/projects/tools/gdb} --annotate=3 --fullname %s --args\" && shift\n", argv_0);
+ fprintf(fp, "$PREFIX%s $*\n", args);
+ fclose(fp);
+ chmod(filename, 0755);
+ }
+ else
+ filename = "[none]";
+ fprintf(stderr, "Welcome to gold! Commandline written to %s.\n", filename);
+ fflush(stderr);
+}
+
+#else // !defined(DEBUG)
+
+static inline std::string
+collect_argv(int, char**)
+{
+ return "";
+}
+
+static inline void
+write_debug_script(std::string, const char*, const char*)
+{
+}
+
+#endif // !defined(DEBUG)
+
+
int
main(int argc, char** argv)
{
@@ -53,6 +132,9 @@ main(int argc, char** argv)
program_name = argv[0];
+ // This is used by write_debug_script(), which wants the unedited argv.
+ std::string args = collect_argv(argc, argv);
+
Errors errors(program_name);
// Initialize the global parameters, to let random code get to the
@@ -74,6 +156,10 @@ main(int argc, char** argv)
// Store some options in the globally accessible parameters.
set_parameters_from_options(&command_line.options());
+ // Do this as early as possible (since it prints a welcome message).
+ write_debug_script(command_line.options().output_file_name(),
+ program_name, args.c_str());
+
// The work queue.
Workqueue workqueue(command_line.options());
@@ -82,7 +168,7 @@ main(int argc, char** argv)
// The symbol table. We're going to guess here how many symbols
// we're going to see based on the number of input files. Even when
- // this is off, it means at worse we don't quite optimize hashtable
+ // this is off, it means at worst we don't quite optimize hashtable
// resizing as well as we could have (perhap using more memory).
Symbol_table symtab(command_line.number_of_input_files() * 1024,
command_line.options().version_script());