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revamped error handling

master
Daniel Kolesa 2017-06-08 19:17:16 +02:00
parent b1292f4c88
commit 0babad3786
1 changed files with 93 additions and 77 deletions
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170
main.cc
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@ -5,6 +5,7 @@
#include <stack>
#include <queue>
#include <future>
#include <stdexcept>
#include <ostd/string.hh>
#include <ostd/format.hh>
@ -28,6 +29,17 @@ using cscript::cs_bcode;
namespace fs = ostd::filesystem;
struct build_error: std::runtime_error {
using std::runtime_error::runtime_error;
template<typename ...A>
build_error(string_range fmt, A const &...args):
build_error(
ostd::format(ostd::appender<std::string>(), fmt, args...).get()
)
{}
};
/* glob matching code */
static void ob_get_path_parts(
@ -269,7 +281,6 @@ static string_range ob_compare_subst(
}
struct ob_state: cs_state {
string_range progname;
bool ignore_env = false;
/* represents a rule definition, possibly with a function */
@ -294,36 +305,27 @@ struct ob_state: cs_state {
std::unordered_map<string_range, std::vector<SubRule>> cache;
std::stack<std::queue<std::future<int>> *> waiting;
std::stack<std::queue<std::future<void>> *> waiting;
template<typename F>
int wait_result(F func) {
std::queue<std::future<int>> waits;
void wait_result(F func) {
std::queue<std::future<void>> waits;
waiting.push(&waits);
int ret = func();
waiting.pop();
if (ret) {
return ret;
try {
func();
} catch (...) {
waiting.pop();
throw;
}
waiting.pop();
while (!waits.empty()) {
auto &t = waits.front();
if (int tr = t.get(); tr) {
/* TODO: wait for unfinished tasks */
return tr;
}
/* TODO: wait for unfinished tasks */
waits.front().get();
waits.pop();
}
return 0;
}
template<typename ...A>
int error(int retcode, string_range fmt, A &&...args) {
ostd::cerr.write(progname, ": ");
ostd::cerr.writefln(fmt, std::forward<A>(args)...);
return retcode;
}
int exec_list(
void exec_list(
std::vector<SubRule> const &rlist, std::vector<std::string> &subdeps,
string_range tname
) {
@ -343,19 +345,15 @@ struct ob_state: cs_state {
atgt = ostd::iter(repd);
}
subdeps.push_back(std::string{atgt});
int r = exec_rule(atgt, tname);
if (r) {
return r;
}
exec_rule(atgt, tname);
}
}
return 0;
}
int exec_func(string_range tname, std::vector<SubRule> const &rlist) {
void exec_func(string_range tname, std::vector<SubRule> const &rlist) {
std::vector<std::string> subdeps;
int ret = wait_result([&rlist, &subdeps, &tname, this]() {
return exec_list(rlist, subdeps, tname);
wait_result([&rlist, &subdeps, &tname, this]() {
exec_list(rlist, subdeps, tname);
});
cs_bcode_ref *func = nullptr;
bool act = false;
@ -366,21 +364,27 @@ struct ob_state: cs_state {
break;
}
}
if ((!ret && (act || ob_check_exec(tname, subdeps))) && func) {
if ((act || ob_check_exec(tname, subdeps)) && func) {
cs_stacked_value targetv, sourcev, sourcesv;
if (!targetv.set_alias(new_ident("target"))) {
return 1;
throw build_error{
"internal error: could not set alias 'target'"
};
}
targetv.set_cstr(tname);
targetv.push();
if (!subdeps.empty()) {
if (!sourcev.set_alias(new_ident("source"))) {
return 1;
throw build_error{
"internal error: could not set alias 'source'"
};
}
if (!sourcesv.set_alias(new_ident("sources"))) {
return 1;
throw build_error{
"internal error: could not set alias 'sources'"
};
}
sourcev.set_cstr(subdeps[0]);
@ -392,18 +396,25 @@ struct ob_state: cs_state {
sourcesv.push();
}
return run_int(*func);
try {
run(*func);
} catch (cscript::cs_error const &e) {
throw build_error{e.what()};
}
}
return ret;
}
int exec_action(Rule *rule) {
return run_int(rule->func);
void exec_action(Rule *rule) {
try {
run(rule->func);
} catch (cscript::cs_error const &e) {
throw build_error{e.what()};
}
}
int find_rules(string_range target, std::vector<SubRule> &rlist) {
void find_rules(string_range target, std::vector<SubRule> &rlist) {
if (!rlist.empty()) {
return 0;
return;
}
SubRule *frule = nullptr;
bool exact = false;
@ -413,7 +424,7 @@ struct ob_state: cs_state {
rlist.back().rule = &rule;
if (rule.func) {
if (frule && exact) {
return error(1, "redefinition of rule '%s'", target);
throw build_error{"redefinition of rule '%s'", target};
}
if (!frule) {
frule = &rlist.back();
@ -436,7 +447,7 @@ struct ob_state: cs_state {
sr.sub = sub;
if (frule) {
if (sub.size() == frule->sub.size()) {
return error(1, "redefinition of rule '%s'", target);
throw build_error{"redefinition of rule '%s'", target};
}
if (sub.size() < frule->sub.size()) {
*frule = sr;
@ -447,34 +458,29 @@ struct ob_state: cs_state {
}
}
}
return 0;
}
int exec_rule(string_range target, string_range from = nullptr) {
void exec_rule(string_range target, string_range from = nullptr) {
std::vector<SubRule> &rlist = cache[target];
int fret = find_rules(target, rlist);
if (fret) {
return fret;
}
find_rules(target, rlist);
if ((rlist.size() == 1) && rlist[0].rule->action) {
return exec_action(rlist[0].rule);
exec_action(rlist[0].rule);
return;
}
if (rlist.empty() && !ob_check_file(target)) {
if (from.empty()) {
return error(1, "no rule to run target '%s'", target);
throw build_error{"no rule to run target '%s'", target};
} else {
return error(
1, "no rule to run target '%s' (needed by '%s')",
target, from
);
throw build_error{
"no rule to run target '%s' (needed by '%s')", target, from
};
}
return 1;
}
return exec_func(target, rlist);
exec_func(target, rlist);
}
int exec_main(string_range target) {
return wait_result([&target, this]() { return exec_rule(target); });
void exec_main(string_range target) {
wait_result([&target, this]() { exec_rule(target); });
}
void rule_add(
@ -550,18 +556,14 @@ struct ob_state: cs_state {
}
};
int main(int argc, char **argv) {
void do_main(int argc, char **argv) {
ob_state os;
string_range pn = argv[0];
string_range lslash = ostd::find_last(pn, '/');
os.progname = lslash.empty() ? pn : lslash.slice(1, lslash.size());
os.init_libs();
int ncpus = std::thread::hardware_concurrency();
os.new_ivar("numcpus", 4096, 1, ncpus);
ostd::arg_parser ap{pn};
ostd::arg_parser ap;
auto &help = ap.add_optional("-h", "--help", 0)
.help("print this message and exit")
@ -603,11 +605,11 @@ int main(int argc, char **argv) {
} catch (ostd::arg_error const &e) {
ostd::cerr.writefln("failed parsing arguments: %s", e.what());
ap.print_help(ostd::cerr.iter());
return 1;
throw build_error{""};
}
if (help.used()) {
return 0;
return;
}
if (!jobs) {
@ -620,9 +622,9 @@ int main(int argc, char **argv) {
fs::current_path(curdir);
}
} catch (fs::filesystem_error const &e) {
return os.error(
1, "failed changing directory: %s (%s)", curdir, e.what()
);
throw build_error{
"failed changing directory: %s (0s)", curdir, e.what()
};
}
os.new_ivar("numjobs", 4096, 1, jobs);
@ -636,13 +638,14 @@ int main(int argc, char **argv) {
writeln(args[0].get_strr());
});
os.new_command("shell", "C", [&os, &tpool](auto &, auto args, auto &res) {
os.new_command("shell", "C", [&os, &tpool](auto &, auto args, auto &) {
os.waiting.top()->push(tpool.push([
ds = std::string(args[0].get_strr())
]() {
return system(ds.data());
if (system(ds.data())) {
throw build_error{""};
}
}));
res.set_int(0);
});
os.new_command("getenv", "ss", [&os](auto &, auto args, auto &res) {
@ -685,8 +688,8 @@ int main(int argc, char **argv) {
res.set_str(std::move(ret));
});
os.new_command("invoke", "s", [&os](auto &, auto args, auto &res) {
res.set_int(os.exec_main(args[0].get_strr()));
os.new_command("invoke", "s", [&os](auto &, auto args, auto &) {
os.exec_main(args[0].get_strr());
});
os.new_command("glob", "C", [&os](auto &cs, auto args, auto &res) {
@ -699,12 +702,25 @@ int main(int argc, char **argv) {
});
if ((!fcont.empty() && !os.run_bool(fcont)) || !os.run_file(deffile)) {
return os.error(1, "failed creating rules");
throw build_error{"failed creating rules"};
}
if (os.rules.empty()) {
return os.error(1, "no targets");
throw build_error{"no targets"};
}
return os.exec_main(action);
os.exec_main(action);
}
int main(int argc, char **argv) {
try {
do_main(argc, argv);
} catch (build_error const &e) {
auto s = e.what();
if (s[0]) {
ostd::cerr.writefln("%s: %s", argv[0], s);
}
return 1;
}
return 0;
}