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-rw-r--r--libbuild2/build/script/parser.cxx871
1 files changed, 790 insertions, 81 deletions
diff --git a/libbuild2/build/script/parser.cxx b/libbuild2/build/script/parser.cxx
index 217fa11..67dbf69 100644
--- a/libbuild2/build/script/parser.cxx
+++ b/libbuild2/build/script/parser.cxx
@@ -3,13 +3,22 @@
#include <libbuild2/build/script/parser.hxx>
+#include <cstring> // strcmp()
+#include <sstream>
+
#include <libbutl/builtin.hxx>
+#include <libbuild2/depdb.hxx>
+#include <libbuild2/dyndep.hxx>
#include <libbuild2/function.hxx>
#include <libbuild2/algorithm.hxx>
+#include <libbuild2/make-parser.hxx>
+
+#include <libbuild2/script/run.hxx>
#include <libbuild2/build/script/lexer.hxx>
#include <libbuild2/build/script/runner.hxx>
+#include <libbuild2/build/script/builtin-options.hxx>
using namespace std;
using namespace butl;
@@ -125,6 +134,8 @@ namespace build2
// Save the custom dependency change tracking lines, if present.
//
s.depdb_clear = depdb_clear_.has_value ();
+ if (depdb_dyndep_)
+ s.depdb_dyndep = depdb_dyndep_->second;
s.depdb_preamble = move (depdb_preamble_);
return s;
@@ -487,7 +498,11 @@ namespace build2
next (t, tt);
if (tt != type::word ||
- (v != "clear" && v != "hash" && v != "string" && v != "env"))
+ (v != "clear" &&
+ v != "hash" &&
+ v != "string" &&
+ v != "env" &&
+ v != "dyndep"))
{
fail (get_location (t))
<< "expected 'depdb' builtin command instead of " << t;
@@ -527,12 +542,39 @@ namespace build2
// the referenced variable list, since it won't be used.
//
depdb_clear_ = l;
- save_line_ = nullptr;
+ save_line_ = nullptr;
script_->vars.clear ();
}
else
{
+ // Verify depdb-dyndep is last.
+ //
+ if (v == "dyndep")
+ {
+ // Note that for now we do not allow multiple dyndep calls.
+ // But we may wan to relax this later (though alternating
+ // targets with prerequisites in depdb may be tricky -- maybe
+ // still only allow additional targets in the first call).
+ //
+ if (!depdb_dyndep_)
+ depdb_dyndep_ = make_pair (l, depdb_preamble_.size ());
+ else
+ fail (l) << "multiple 'depdb dyndep' calls" <<
+ info (depdb_dyndep_->first) << "previous call is here";
+
+#if 0
+ if (peek () == type::word && peeked ().value == "--byproduct")
+ ;
+#endif
+ }
+ else
+ {
+ if (depdb_dyndep_)
+ fail (l) << "'depdb " << v << "' after 'depdb dyndep'" <<
+ info (depdb_dyndep_->first) << "'depdb dyndep' call is here";
+ }
+
// Move the script body to the end of the depdb preamble.
//
// Note that at this (pre-parsing) stage we cannot evaluate if
@@ -885,114 +927,140 @@ namespace build2
}
void parser::
- execute_depdb_preamble (const scope& rs, const scope& bs,
- environment& e, const script& s, runner& r,
- depdb& dd)
+ exec_depdb_preamble (action a, const scope& bs, const file& t,
+ environment& e, const script& s, runner& r,
+ lines_iterator begin, lines_iterator end,
+ depdb& dd,
+ bool* update,
+ bool* deferred_failure,
+ optional<timestamp> mt)
{
- tracer trace ("execute_depdb_preamble");
+ tracer trace ("exec_depdb_preamble");
// The only valid lines in the depdb preamble are the depdb builtin
// itself as well as the variable assignments, including via the set
// builtin.
- pre_exec (rs, bs, e, &s, &r);
+ pre_exec (*bs.root_scope (), bs, e, &s, &r);
// Let's "wrap up" the objects we operate upon into the single object
// to rely on "small function object" optimization.
//
struct
{
+ tracer& trace;
+
+ action a;
+ const scope& bs;
+ const file& t;
+
environment& env;
const script& scr;
+
depdb& dd;
- tracer& trace;
- } ctx {e, s, dd, trace};
-
- auto exec_cmd = [&ctx, this]
- (token& t,
- build2::script::token_type& tt,
- size_t li,
- bool /* single */,
- const location& ll)
+ bool* update;
+ bool* deferred_failure;
+ optional<timestamp> mt;
+
+ } data {trace, a, bs, t, e, s, dd, update, deferred_failure, mt};
+
+ auto exec_cmd = [this, &data] (token& t,
+ build2::script::token_type& tt,
+ size_t li,
+ bool /* single */,
+ const location& ll)
{
+ // Note that we never reset the line index to zero (as we do in
+ // execute_body()) assuming that there are some script body
+ // commands to follow.
+ //
if (tt == type::word && t.value == "depdb")
{
- names ns (exec_special (t, tt));
+ next (t, tt);
// This should have been enforced during pre-parsing.
//
- assert (!ns.empty ()); // <cmd> ... <newline>
+ assert (tt == type::word); // <cmd> ... <newline>
- const string& cmd (ns[0].value);
+ string cmd (move (t.value));
- if (cmd == "hash")
+ if (cmd == "dyndep")
{
- sha256 cs;
- for (auto i (ns.begin () + 1); i != ns.end (); ++i) // Skip <cmd>.
- to_checksum (cs, *i);
-
- if (ctx.dd.expect (cs.string ()) != nullptr)
- l4 ([&] {
- ctx.trace (ll)
- << "'depdb hash' argument change forcing update of "
- << ctx.env.target;});
+ // Note: cast is safe since this is always executed in apply().
+ //
+ exec_depdb_dyndep (t, tt,
+ li, ll,
+ data.a, data.bs, const_cast<file&> (data.t),
+ data.dd,
+ *data.update,
+ *data.deferred_failure,
+ *data.mt);
}
- else if (cmd == "string")
+ else
{
- string s;
- try
- {
- s = convert<string> (
- names (make_move_iterator (ns.begin () + 1),
- make_move_iterator (ns.end ())));
- }
- catch (const invalid_argument& e)
+ names ns (exec_special (t, tt, true /* skip <cmd> */));
+
+ if (cmd == "hash")
{
- fail (ll) << "invalid 'depdb string' argument: " << e;
+ sha256 cs;
+ for (const name& n: ns)
+ to_checksum (cs, n);
+
+ if (data.dd.expect (cs.string ()) != nullptr)
+ l4 ([&] {
+ data.trace (ll)
+ << "'depdb hash' argument change forcing update of "
+ << data.t;});
}
-
- if (ctx.dd.expect (s) != nullptr)
- l4 ([&] {
- ctx.trace (ll)
- << "'depdb string' argument change forcing update of "
- << ctx.env.target;});
- }
- else if (cmd == "env")
- {
- sha256 cs;
- const char* pf ("invalid 'depdb env' argument: ");
-
- try
+ else if (cmd == "string")
{
- // Skip <cmd>.
- //
- for (auto i (ns.begin () + 1); i != ns.end (); ++i)
+ string s;
+ try
+ {
+ s = convert<string> (move (ns));
+ }
+ catch (const invalid_argument& e)
{
- string vn (convert<string> (move (*i)));
- build2::script::verify_environment_var_name (vn, pf, ll);
- hash_environment (cs, vn);
+ fail (ll) << "invalid 'depdb string' argument: " << e;
}
+
+ if (data.dd.expect (s) != nullptr)
+ l4 ([&] {
+ data.trace (ll)
+ << "'depdb string' argument change forcing update of "
+ << data.t;});
}
- catch (const invalid_argument& e)
+ else if (cmd == "env")
{
- fail (ll) << pf << e;
- }
+ sha256 cs;
+ const char* pf ("invalid 'depdb env' argument: ");
- if (ctx.dd.expect (cs.string ()) != nullptr)
- l4 ([&] {
- ctx.trace (ll)
- << "'depdb env' environment change forcing update of "
- << ctx.env.target;});
+ try
+ {
+ for (name& n: ns)
+ {
+ string vn (convert<string> (move (n)));
+ build2::script::verify_environment_var_name (vn, pf, ll);
+ hash_environment (cs, vn);
+ }
+ }
+ catch (const invalid_argument& e)
+ {
+ fail (ll) << pf << e;
+ }
+
+ if (data.dd.expect (cs.string ()) != nullptr)
+ l4 ([&] {
+ data.trace (ll)
+ << "'depdb env' environment change forcing update of "
+ << data.t;});
+ }
+ else
+ assert (false);
}
- else
- assert (false);
}
else
{
- // Note that we don't reset the line index to zero (as we do in
- // execute_body()) assuming that there are some script body
- // commands to follow.
- //
command_expr ce (
parse_command_line (t, static_cast<token_type&> (tt)));
@@ -1006,7 +1074,7 @@ namespace build2
p.recall.string () == "set";
}) == ce.end ())
{
- const replay_tokens& rt (ctx.scr.depdb_preamble.back ().tokens);
+ const replay_tokens& rt (data.scr.depdb_preamble.back ().tokens);
assert (!rt.empty ());
fail (ll) << "disallowed command in depdb preamble" <<
@@ -1019,7 +1087,7 @@ namespace build2
}
};
- exec_lines (s.depdb_preamble, exec_cmd);
+ exec_lines (begin, end, exec_cmd);
}
void parser::
@@ -1051,7 +1119,7 @@ namespace build2
}
void parser::
- exec_lines (const lines& lns,
+ exec_lines (lines_iterator begin, lines_iterator end,
const function<exec_cmd_function>& exec_cmd)
{
// Note that we rely on "small function object" optimization for the
@@ -1090,25 +1158,23 @@ namespace build2
return runner_->run_if (*environment_, ce, li, ll);
};
- build2::script::parser::exec_lines (lns.begin (), lns.end (),
+ build2::script::parser::exec_lines (begin, end,
exec_set, exec_cmd, exec_if,
environment_->exec_line,
&environment_->var_pool);
}
names parser::
- exec_special (token& t, build2::script::token_type& tt,
- bool omit_builtin)
+ exec_special (token& t, build2::script::token_type& tt, bool skip_first)
{
- if (omit_builtin)
+ if (skip_first)
{
assert (tt != type::newline && tt != type::eos);
-
next (t, tt);
}
return tt != type::newline && tt != type::eos
- ? parse_names (t, tt, pattern_mode::expand)
+ ? parse_names (t, tt, pattern_mode::ignore)
: names ();
}
@@ -1134,6 +1200,649 @@ namespace build2
return r;
}
+ void parser::
+ exec_depdb_dyndep (token& lt, build2::script::token_type& ltt,
+ size_t li, const location& ll,
+ action a, const scope& bs, file& t,
+ depdb& dd,
+ bool& update,
+ bool& deferred_failure,
+ timestamp mt)
+ {
+ tracer trace ("exec_depdb_dyndep");
+
+ context& ctx (t.ctx);
+
+ // Similar approach to parse_env_builtin().
+ //
+ depdb_dep_options ops;
+ bool prog (false);
+ {
+ auto& t (lt);
+ auto& tt (ltt);
+
+ next (t, tt); // Skip 'dep' command.
+
+ // Note that an option name and value can belong to different name
+ // chunks. That's why we parse the arguments in the chunking mode
+ // into the list up to the `--` separator and parse this list into
+ // options afterwards. Note that the `--` separator should be
+ // omitted if there is no program (i.e., additional dependency info
+ // is being read from one of the prerequisites).
+ //
+ strings args;
+
+ names ns; // Reuse to reduce allocations.
+ while (tt != type::newline && tt != type::eos)
+ {
+ if (tt == type::word && t.value == "--")
+ {
+ prog = true;
+ break;
+ }
+
+ location l (get_location (t));
+
+ if (!start_names (tt))
+ fail (l) << "depdb dyndep: expected option or '--' separator "
+ << "instead of " << t;
+
+ parse_names (t, tt,
+ ns,
+ pattern_mode::ignore,
+ true /* chunk */,
+ "depdb dyndep builtin argument",
+ nullptr);
+
+ for (name& n: ns)
+ {
+ try
+ {
+ args.push_back (convert<string> (move (n)));
+ }
+ catch (const invalid_argument&)
+ {
+ diag_record dr (fail (l));
+ dr << "invalid string value ";
+ to_stream (dr.os, n, true /* quote */);
+ }
+ }
+
+ ns.clear ();
+ }
+
+ if (prog)
+ {
+ next (t, tt); // Skip '--'.
+
+ if (tt == type::newline || tt == type::eos)
+ fail (t) << "depdb dyndep: expected program name instead of "
+ << t;
+ }
+
+ // Parse the options.
+ //
+ // We would like to support both -I <dir> as well as -I<dir> forms
+ // for better compatibility. The latter requires manual parsing.
+ //
+ try
+ {
+ for (cli::vector_scanner scan (args); scan.more (); )
+ {
+ if (ops.parse (scan, cli::unknown_mode::stop) && !scan.more ())
+ break;
+
+ const char* a (scan.peek ());
+
+ // Handle -I<dir>
+ //
+ if (a[0] == '-' && a[1] == 'I')
+ {
+ try
+ {
+ ops.include_path ().push_back (dir_path (a + 2));
+ }
+ catch (const invalid_path&)
+ {
+ throw cli::invalid_value ("-I", a + 2);
+ }
+
+ scan.next ();
+ continue;
+ }
+
+#if 0
+ // Handle --byproduct in the wrong place.
+ //
+ if (strcmp (a, "--byproduct") == 0)
+ fail (ll) << "depdb dyndep: --byproduct must be first option";
+#endif
+
+ // Handle unknown option.
+ //
+ if (a[0] == '-')
+ throw cli::unknown_option (a);
+
+ // Handle unexpected argument.
+ //
+ fail (ll) << "depdb dyndep: unexpected argument '" << a << "'";
+ }
+ }
+ catch (const cli::exception& e)
+ {
+ fail (ll) << "depdb dyndep: " << e;
+ }
+ }
+
+ // Get the default prerequisite type falling back to file{} if not
+ // specified.
+ //
+ // The reason one would want to specify it is to make sure different
+ // rules "resolve" the same dynamic prerequisites to the same targets.
+ // For example, a rule that implements custom C compilation for some
+ // translation unit would want to make sure it resolves extracted
+ // system headers to h{} targets analogous to the c module's rule.
+ //
+ const target_type* def_pt;
+ if (ops.default_prereq_type_specified ())
+ {
+ const string& t (ops.default_prereq_type ());
+
+ def_pt = bs.find_target_type (t);
+ if (def_pt == nullptr)
+ fail (ll) << "unknown target type '" << t << "'";
+ }
+ else
+ def_pt = &file::static_type;
+
+ // This code is based on the prior work in the cc module (specifically
+ // extract_headers()) where you can often find more detailed rationale
+ // for some of the steps performed.
+
+ using dyndep = dyndep_rule;
+
+ // Build the maps lazily, only if/when needed.
+ //
+ using prefix_map = dyndep::prefix_map;
+ using srcout_map = dyndep::srcout_map;
+
+ function<dyndep::map_extension_func> map_ext (
+ [] (const scope& bs, const string& n, const string& e)
+ {
+ // @@ TODO: allow specifying base target types.
+ //
+ // Feels like the only reason one would want to specify base types
+ // is to tighten things up (as opposed to making some setup work)
+ // since it essentially restricts the set of registered target
+ // types that we will consider.
+ //
+ // Note also that these would be this project's target types while
+ // the file could be from another project.
+ //
+ return dyndep::map_extension (bs, n, e, nullptr);
+
+ // @@ TODO: should we return something as fallback (file{},
+ // def_pt)? Note: not the same semantics as enter_file()'s
+ // fallback. Feels like it could conceivably be different
+ // (e.g., h{} for fallback and hxx{} for some "unmappable" gen
+ // header). It looks like the "best" way currently is to define
+ // a custom target types for it (see moc{} in libQt5Core).
+ //
+ // Note also that we should only do this if bs is in our
+ // project.
+ });
+
+ // Don't we want to insert a "local"/prefixless mapping in case the
+ // user did not specify any -I's? But then will also need src-out
+ // remapping. So it will be equivalent to -I$out_base -I$src_base? But
+ // then it's not hard to add explicitly...
+ //
+ function<dyndep::prefix_map_func> pfx_map;
+
+ struct
+ {
+ tracer& trace;
+ const location& ll;
+ const depdb_dep_options& ops;
+ optional<prefix_map> map;
+ } pfx_data {trace, ll, ops, nullopt};
+
+ if (!ops.include_path ().empty ())
+ {
+ pfx_map = [this, &pfx_data] (action,
+ const scope& bs,
+ const target& t) -> const prefix_map&
+ {
+ if (!pfx_data.map)
+ {
+ pfx_data.map = prefix_map ();
+
+ const scope& rs (*bs.root_scope ());
+
+ for (dir_path d: pfx_data.ops.include_path ())
+ {
+ if (d.relative ())
+ fail (pfx_data.ll) << "depdb dyndep: relative include "
+ << "search path " << d;
+
+ if (!d.normalized (false /* canonical dir seperators */))
+ d.normalize ();
+
+ // If we are not inside our project root, then ignore.
+ //
+ if (d.sub (rs.out_path ()))
+ dyndep::append_prefix (
+ pfx_data.trace, *pfx_data.map, t, move (d));
+ }
+ }
+
+ return *pfx_data.map;
+ };
+ }
+
+ optional<path> file;
+ enum class format {make} fmt (format::make);
+ command_expr cmd;
+ srcout_map so_map;
+
+ // Parse the remainder of the command line as a program (which can be
+ // a pipe). If file is absent, then we save the command's stdout to a
+ // pipe. Otherwise, assume the command writes to file and add it to
+ // the cleanups.
+ //
+ // Note that MSVC /showInclude sends its output to stderr (and so
+ // could do other broken tools). However, the user can always merge
+ // stderr to stdout (2>&1).
+ //
+ auto init_run = [this, &ctx,
+ &lt, &ltt, &ll,
+ &ops, prog, &file, &cmd, &so_map] ()
+ {
+ // --format
+ //
+ if (ops.format_specified ())
+ {
+ const string& f (ops.format ());
+
+ if (f != "make")
+ fail (ll) << "depdb dyndep: invalid --format option value '"
+ << f << "'";
+ }
+
+ // --file
+ //
+ if (ops.file_specified ())
+ {
+ file = move (ops.file ());
+
+ if (file->relative ())
+ fail (ll) << "depdb dyndep: relative path specified with --file";
+ }
+
+ // Populate the srcout map with the -I$out_base -I$src_base pairs.
+ //
+ {
+ dyndep::srcout_builder builder (ctx, so_map);
+
+ for (dir_path d: ops.include_path ())
+ builder.next (move (d));
+ }
+
+ if (prog)
+ {
+ cmd = parse_command_line (lt, static_cast<token_type&> (ltt));
+
+ // If the output goes to stdout, then this should be a single
+ // pipeline without any logical operators (&& or ||).
+ //
+ if (!file && cmd.size () != 1)
+ fail (ll) << "depdb dyndep: command with stdout output cannot "
+ << "contain logical operators";
+
+ // Note that we may need to run this command multiple times. The
+ // two potential issues here are the re-registration of the
+ // clenups and re-use of the special files (stdin, stdout, etc;
+ // they include the line index in their names to avoid clashes
+ // between lines).
+ //
+ // Cleanups are not an issue, they will simply replaced. And
+ // overriding the contents of the special files seems harmless and
+ // consistent with what would happen if the command redirects its
+ // output to a non-special file.
+ //
+ if (file)
+ environment_->clean (
+ {build2::script::cleanup_type::always, *file},
+ true /* implicit */);
+ }
+ else
+ {
+ // Assume file is one of the prerequisites.
+ //
+ if (!file)
+ fail (ll) << "depdb dyndep: program or --file expected";
+ }
+ };
+
+ // Enter as a target, update, and add to the list of prerequisite
+ // targets a file.
+ //
+ const char* what (ops.what_specified ()
+ ? ops.what ().c_str ()
+ : "file");
+
+ size_t skip_count (0);
+ auto add = [this, &trace, what,
+ a, &bs, &t,
+ &map_ext, def_pt, &pfx_map, &so_map,
+ &dd, &skip_count] (path fp,
+ bool cache,
+ timestamp mt) -> optional<bool>
+ {
+ context& ctx (t.ctx);
+
+ // We can only defer the failure if we will be running the recipe
+ // body.
+ //
+ auto fail = [this, what, &ctx] (const auto& f) -> optional<bool>
+ {
+ bool df (!ctx.match_only && !ctx.dry_run_option);
+
+ diag_record dr;
+ dr << error << what << ' ' << f << " not found and no rule to "
+ << "generate it";
+
+ if (df)
+ dr << info << "failure deferred to recipe body diagnostics";
+
+ if (verb < 4)
+ dr << info << "re-run with --verbose=4 for more information";
+
+ if (df)
+ return nullopt;
+ else
+ dr << endf;
+ };
+
+ if (const build2::file* ft = dyndep::enter_file (
+ trace, what,
+ a, bs, t,
+ move (fp), cache, false /* normalize */,
+ map_ext, *def_pt, pfx_map, so_map).first)
+ {
+ if (optional<bool> u = dyndep::inject_file (
+ trace, what,
+ a, t,
+ *ft, mt, false /* fail */))
+ {
+ if (!cache)
+ dd.expect (ft->path ());
+
+ skip_count++;
+ return *u;
+ }
+ else if (cache)
+ {
+ dd.write (); // Invalidate this line.
+ return true;
+ }
+ else
+ return fail (*ft);
+ }
+ else
+ return fail (fp);
+ };
+
+ // If things go wrong (and they often do in this area), give the user
+ // a bit extra context.
+ //
+ auto df = make_diag_frame (
+ [this, &ll, &t] (const diag_record& dr)
+ {
+ if (verb != 0)
+ dr << info (ll) << "while extracting dynamic dependencies for "
+ << t;
+ });
+
+ // If nothing so far has invalidated the dependency database, then try
+ // the cached data before running the program.
+ //
+ bool cache (!update);
+
+ for (bool restart (true), first_run (true); restart; cache = false)
+ {
+ restart = false;
+
+ if (cache)
+ {
+ // If any, this is always the first run.
+ //
+ assert (skip_count == 0);
+
+ // We should always end with a blank line.
+ //
+ for (;;)
+ {
+ string* l (dd.read ());
+
+ // If the line is invalid, run the compiler.
+ //
+ if (l == nullptr)
+ {
+ restart = true;
+ break;
+ }
+
+ if (l->empty ()) // Done, nothing changed.
+ return;
+
+ if (optional<bool> r = add (path (move (*l)), true /*cache*/, mt))
+ {
+ restart = *r;
+
+ if (restart)
+ {
+ update = true;
+ l6 ([&]{trace << "restarting (cache)";});
+ break;
+ }
+ }
+ else
+ {
+ // Trigger rebuild and mark as expected to fail.
+ //
+ update = true;
+ deferred_failure = true;
+ return;
+ }
+ }
+ }
+ else
+ {
+ if (first_run)
+ {
+ init_run ();
+ first_run = false;
+ }
+ else if (!prog)
+ {
+ fail (ll) << "generated " << what << " without program to retry";
+ }
+
+ // Save the timestamp just before we run the command. If we depend
+ // on any file that has been updated since, then we should assume
+ // we have "seen" the old copy and restart.
+ //
+ timestamp rmt (prog ? system_clock::now () : mt);
+
+ // Run the command if any and reduce outputs to common istream.
+ //
+ // Note that the resulting stream should tolerate partial read.
+ //
+ // While reading the entire stdout into a string is not the most
+ // efficient way to do it, this does simplify things quite a bit,
+ // not least of which is not having to parse the output before
+ // knowing the program exist status.
+ //
+ istringstream iss;
+ if (prog)
+ {
+ string s;
+ build2::script::run (*environment_,
+ cmd,
+ li,
+ ll,
+ !file ? &s : nullptr);
+
+ if (!file)
+ {
+ iss.str (move (s));
+ iss.exceptions (istream::badbit);
+ }
+ }
+
+ ifdstream ifs (ifdstream::badbit);
+ if (file)
+ try
+ {
+ ifs.open (*file);
+ }
+ catch (const io_error& e)
+ {
+ fail (ll) << "unable to open file " << *file << ": " << e;
+ }
+
+ istream& is (file
+ ? static_cast<istream&> (ifs)
+ : static_cast<istream&> (iss));
+
+ const path_name& in (file
+ ? path_name (*file)
+ : path_name ("<stdin>"));
+
+ location il (in, 1);
+
+ // The way we parse things is format-specific.
+ //
+ size_t skip (skip_count);
+
+ switch (fmt)
+ {
+ case format::make:
+ {
+ using make_state = make_parser;
+ using make_type = make_parser::type;
+
+ make_parser make;
+
+ for (string l; !restart; ++il.line) // Reuse the buffer.
+ {
+ if (eof (getline (is, l)))
+ {
+ if (make.state != make_state::end)
+ fail (il) << "incomplete make dependency declaration";
+
+ break;
+ }
+
+ size_t pos (0);
+ do
+ {
+ pair<make_type, string> r;
+ {
+ auto df = make_diag_frame (
+ [this, &l] (const diag_record& dr)
+ {
+ if (verb != 0)
+ dr << info << "while parsing make dependency "
+ << "declaration line '" << l << "'";
+ });
+
+ r = make.next (l, pos, il, false /* strict */);
+ }
+
+ if (r.second.empty ())
+ continue;
+
+ // @@ TODO: what should we do about targets?
+ //
+ // Note that if we take GCC as an example, things are
+ // quite messed up: by default it ignores -o and just
+ // takes the source file name and replaces the extension
+ // with a platform-appropriate object file extension. One
+ // can specify a custom target (or even multiple targets)
+ // with -MT or with -MQ (quoting). Though MinGW GCC still
+ // does not quote `:` with -MQ. So in this case it's
+ // definitely easier for the user to ignore the targets
+ // and just specify everything in the buildfile.
+ //
+ // On the other hand, other tools are likely to produce
+ // more sensible output (except perhaps for quoting).
+ //
+ // @@ Maybe in the lax mode we should only recognize `:`
+ // if it's separated on at least one side?
+ //
+ // Alternatively, we could detect Windows drives in
+ // paths and "handle" them (I believe this is what GNU
+ // make does). Maybe we should have three formats:
+ // make-lax, make, make-strict?
+ //
+ if (r.first == make_type::target)
+ continue;
+
+ // Skip until where we left off.
+ //
+ if (skip != 0)
+ {
+ skip--;
+ continue;
+ }
+
+ if (optional<bool> u = add (path (move (r.second)),
+ false /* cache */,
+ rmt))
+ {
+ restart = *u;
+
+ if (restart)
+ {
+ update = true;
+ l6 ([&]{trace << "restarting";});
+ break;
+ }
+ }
+ else
+ {
+ // Trigger recompilation, mark as expected to fail, and
+ // bail out.
+ //
+ update = true;
+ deferred_failure = true;
+ break;
+ }
+ }
+ while (pos != l.size ());
+
+ if (make.state == make_state::end || deferred_failure)
+ break;
+ }
+
+ break;
+ }
+ }
+
+ // Bail out early if we have deferred a failure.
+ //
+ if (deferred_failure)
+ return;
+ }
+ }
+
+ // Add the terminating blank line (we are updating depdb).
+ //
+ dd.expect ("");
+ }
+
// When add a special variable don't forget to update lexer::word().
//
bool parser::
generated by cgit v1.1 at 2024-11-09 22:35:49 +0000