diff options
Diffstat (limited to 'libbuild2/context.cxx')
| -rw-r--r-- | libbuild2/context.cxx | 453 |
1 files changed, 245 insertions, 208 deletions
diff --git a/libbuild2/context.cxx b/libbuild2/context.cxx index 90c4f6c..1bc294d 100644 --- a/libbuild2/context.cxx +++ b/libbuild2/context.cxx @@ -72,6 +72,220 @@ namespace build2 data_->var_pool.map_.reserve (res.variables); } + pair<char, variable_override> context:: + parse_variable_override (const string& s, size_t i, bool buildspec) + { + istringstream is (s); + is.exceptions (istringstream::failbit | istringstream::badbit); + + // Similar to buildspec we do "effective escaping" of the special `'"\$(` + // characters (basically what's escapable inside a double-quoted literal + // plus the single quote; note, however, that we exclude line + // continuations and `)` since they would make directory paths on Windows + // unusable). + // + path_name in ("<cmdline>"); + lexer l (is, in, 1 /* line */, "\'\"\\$("); + + // At the buildfile level the scope-specific variable should be separated + // from the directory with a whitespace, for example: + // + // ./ foo=$bar + // + // However, requiring this for command line variables would be too + // inconvinient so we support both. + // + // We also have the optional visibility modifier as a first character of + // the variable name: + // + // ! - global + // % - project + // / - scope + // + // The last one clashes a bit with the directory prefix: + // + // ./ /foo=bar + // .//foo=bar + // + // But that's probably ok (the need for a scope-qualified override with + // scope visibility should be pretty rare). Note also that to set the + // value on the global scope we use !. + // + // And so the first token should be a word which can be either a variable + // name (potentially with the directory qualification) or just the + // directory, in which case it should be followed by another word + // (unqualified variable name). To avoid treating any of the visibility + // modifiers as special we use the cmdvar mode. + // + l.mode (lexer_mode::cmdvar); + token t (l.next ()); + + optional<dir_path> dir; + if (t.type == token_type::word) + { + string& v (t.value); + size_t p (path::traits_type::rfind_separator (v)); + + if (p != string::npos && p != 0) // If first then visibility. + { + if (p == v.size () - 1) + { + // Separate directory. + // + dir = dir_path (move (v)); + t = l.next (); + + // Target-specific overrides are not yet supported (and probably + // never will be; the beast is already complex enough). + // + if (t.type == token_type::colon) + { + diag_record dr (fail); + + dr << "'" << s << "' is a target-specific override"; + + if (buildspec) + dr << info << "use double '--' to treat this argument as " + << "buildspec"; + } + } + else + { + // Combined directory. + // + // If double separator (visibility marker), then keep the first in + // name. + // + if (p != 0 && path::traits_type::is_separator (v[p - 1])) + --p; + + dir = dir_path (t.value, 0, p + 1); // Include the separator. + t.value.erase (0, p + 1); // Erase the separator. + } + + if (dir->relative ()) + { + // Handle the special relative to base scope case (.../). + // + auto i (dir->begin ()); + + if (*i == "...") + dir = dir_path (++i, dir->end ()); // Note: can become empty. + else + dir->complete (); // Relative to CWD. + } + + if (dir->absolute ()) + dir->normalize (); + } + } + + token_type tt (l.next ().type); + + // The token should be the variable name followed by =, +=, or =+. + // + if (t.type != token_type::word || t.value.empty () || + (tt != token_type::assign && + tt != token_type::prepend && + tt != token_type::append)) + { + diag_record dr (fail); + + dr << "expected variable assignment instead of '" << s << "'"; + + if (buildspec) + dr << info << "use double '--' to treat this argument as buildspec"; + } + + // Take care of the visibility. Note that here we rely on the fact that + // none of these characters are lexer's name separators. + // + char c (t.value[0]); + + if (path::traits_type::is_separator (c)) + c = '/'; // Normalize. + + string n (t.value, c == '!' || c == '%' || c == '/' ? 1 : 0); + + // Make sure it is qualified. + // + // We can support overridable public unqualified variables (which must + // all be pre-entered by the end of this constructor) but we will need + // to detect their names here in an ad hoc manner (we cannot enter them + // before this logic because of the "untyped override" requirement). + // + // Note: issue the same diagnostics as in variable_pool::update(). + // + if (n.find ('.') == string::npos) + fail << "variable " << n << " cannot be overridden"; + + if (c == '!' && dir) + fail << "scope-qualified global override of variable " << n; + + // Pre-enter the main variable. Note that we rely on all the overridable + // variables with global visibility to be known (either entered or + // handled via a pattern) at this stage. + // + variable_pool& vp (data_->var_pool); + variable& var ( + const_cast<variable&> (vp.insert (n, true /* overridable */))); + + const variable* o; + { + variable_visibility v (c == '/' ? variable_visibility::scope : + c == '%' ? variable_visibility::project : + variable_visibility::global); + + const char* k (tt == token_type::assign ? "__override" : + tt == token_type::append ? "__suffix" : "__prefix"); + + unique_ptr<variable> p ( + new variable { + n + '.' + to_string (i + 1) + '.' + k, + &vp /* owner */, + nullptr /* aliases */, + nullptr /* type */, + nullptr /* overrides */, + v}); + + // Back link. + // + p->aliases = p.get (); + if (var.overrides != nullptr) + swap (p->aliases, + const_cast<variable*> (var.overrides.get ())->aliases); + + // Forward link. + // + p->overrides = move (var.overrides); + var.overrides = move (p); + + o = var.overrides.get (); + } + + // Currently we expand project overrides in the global scope to keep + // things simple. Pass original variable for diagnostics. Use current + // working directory as pattern base. + // + scope& gs (global_scope.rw ()); + + parser p (*this); + pair<value, token> r (p.parse_variable_value (l, gs, &work, var)); + + if (r.second.type != token_type::eos) + fail << "unexpected " << r.second << " in variable assignment " + << "'" << s << "'"; + + // Make sure the value is not typed. + // + if (r.first.type != nullptr) + fail << "typed override of variable " << n; + + return make_pair ( + c, + variable_override {var, *o, move (dir), move (r.first)}); + } + context:: context (scheduler& s, global_mutexes& ms, @@ -84,7 +298,8 @@ namespace build2 const strings& cmd_vars, reserves res, optional<context*> mc, - const loaded_modules_lock* ml) + const loaded_modules_lock* ml, + const function<var_override_function>& var_ovr_func) : data_ (new data (*this)), sched (&s), mutexes (&ms), @@ -130,7 +345,7 @@ namespace build2 // meta_operation_table.insert ("noop"); meta_operation_table.insert ("perform"); - meta_operation_table.insert ("configure"); + meta_operation_table.insert ("configure"); // bpkg assumes no process. meta_operation_table.insert ("disfigure"); if (config_preprocess_create != nullptr) @@ -373,223 +588,44 @@ namespace build2 // marked as such first. Then, as we enter variables, we can verify that // the override is alowed. // - for (size_t i (0); i != cmd_vars.size (); ++i) { - const string& s (cmd_vars[i]); + size_t i (0); + for (; i != cmd_vars.size (); ++i) + { + const string& s (cmd_vars[i]); - istringstream is (s); - is.exceptions (istringstream::failbit | istringstream::badbit); + pair<char, variable_override> p ( + parse_variable_override (s, i, true /* buildspec */)); - // Similar to buildspec we do "effective escaping" of the special - // `'"\$(` characters (basically what's escapable inside a double-quoted - // literal plus the single quote; note, however, that we exclude line - // continuations and `)` since they would make directory paths on - // Windows unusable). - // - path_name in ("<cmdline>"); - lexer l (is, in, 1 /* line */, "\'\"\\$("); + char c (p.first); + variable_override& vo (p.second); - // At the buildfile level the scope-specific variable should be - // separated from the directory with a whitespace, for example: - // - // ./ foo=$bar - // - // However, requiring this for command line variables would be too - // inconvinient so we support both. - // - // We also have the optional visibility modifier as a first character of - // the variable name: - // - // ! - global - // % - project - // / - scope - // - // The last one clashes a bit with the directory prefix: - // - // ./ /foo=bar - // .//foo=bar - // - // But that's probably ok (the need for a scope-qualified override with - // scope visibility should be pretty rare). Note also that to set the - // value on the global scope we use !. - // - // And so the first token should be a word which can be either a - // variable name (potentially with the directory qualification) or just - // the directory, in which case it should be followed by another word - // (unqualified variable name). To avoid treating any of the visibility - // modifiers as special we use the cmdvar mode. - // - l.mode (lexer_mode::cmdvar); - token t (l.next ()); - - optional<dir_path> dir; - if (t.type == token_type::word) - { - string& v (t.value); - size_t p (path::traits_type::rfind_separator (v)); - - if (p != string::npos && p != 0) // If first then visibility. + // Global and absolute scope overrides we can enter directly. Project + // and relative scope ones will be entered later for each project. + // + if (c == '!' || (vo.dir && vo.dir->absolute ())) { - if (p == v.size () - 1) - { - // Separate directory. - // - dir = dir_path (move (v)); - t = l.next (); - - // Target-specific overrides are not yet supported (and probably - // never will be; the beast is already complex enough). - // - if (t.type == token_type::colon) - fail << "'" << s << "' is a target-specific override" << - info << "use double '--' to treat this argument as buildspec"; - } - else - { - // Combined directory. - // - // If double separator (visibility marker), then keep the first in - // name. - // - if (p != 0 && path::traits_type::is_separator (v[p - 1])) - --p; - - dir = dir_path (t.value, 0, p + 1); // Include the separator. - t.value.erase (0, p + 1); // Erase the separator. - } + scope& s (c == '!' ? gs : *sm.insert_out (*vo.dir)->second.front ()); - if (dir->relative ()) - { - // Handle the special relative to base scope case (.../). - // - auto i (dir->begin ()); - - if (*i == "...") - dir = dir_path (++i, dir->end ()); // Note: can become empty. - else - dir->complete (); // Relative to CWD. - } + auto p (s.vars.insert (vo.ovr)); + assert (p.second); // Variable name is unique. - if (dir->absolute ()) - dir->normalize (); + value& v (p.first); + v = move (vo.val); } - } - - token_type tt (l.next ().type); + else + data_->var_overrides.push_back (move (vo)); - // The token should be the variable name followed by =, +=, or =+. - // - if (t.type != token_type::word || t.value.empty () || - (tt != token_type::assign && - tt != token_type::prepend && - tt != token_type::append)) - { - fail << "expected variable assignment instead of '" << s << "'" << - info << "use double '--' to treat this argument as buildspec"; - } - - // Take care of the visibility. Note that here we rely on the fact that - // none of these characters are lexer's name separators. - // - char c (t.value[0]); - - if (path::traits_type::is_separator (c)) - c = '/'; // Normalize. - - string n (t.value, c == '!' || c == '%' || c == '/' ? 1 : 0); - - // Make sure it is qualified. - // - // We can support overridable public unqualified variables (which must - // all be pre-entered by the end of this constructor) but we will need - // to detect their names here in an ad hoc manner (we cannot enter them - // before this logic because of the "untyped override" requirement). - // - // Note: issue the same diagnostics as in variable_pool::update(). - // - if (n.find ('.') == string::npos) - fail << "variable " << n << " cannot be overridden"; - - if (c == '!' && dir) - fail << "scope-qualified global override of variable " << n; - - // Pre-enter the main variable. Note that we rely on all the overridable - // variables with global visibility to be known (either entered or - // handled via a pettern) at this stage. - // - variable& var ( - const_cast<variable&> (vp.insert (n, true /* overridable */))); - - const variable* o; - { - variable_visibility v (c == '/' ? variable_visibility::scope : - c == '%' ? variable_visibility::project : - variable_visibility::global); - - const char* k (tt == token_type::assign ? "__override" : - tt == token_type::append ? "__suffix" : "__prefix"); - - unique_ptr<variable> p ( - new variable { - n + '.' + to_string (i + 1) + '.' + k, - &vp /* owner */, - nullptr /* aliases */, - nullptr /* type */, - nullptr /* overrides */, - v}); - - // Back link. + // Save global overrides for nested contexts. // - p->aliases = p.get (); - if (var.overrides != nullptr) - swap (p->aliases, - const_cast<variable*> (var.overrides.get ())->aliases); - - // Forward link. - // - p->overrides = move (var.overrides); - var.overrides = move (p); - - o = var.overrides.get (); + if (c == '!') + data_->global_var_overrides.push_back (s); } - // Currently we expand project overrides in the global scope to keep - // things simple. Pass original variable for diagnostics. Use current - // working directory as pattern base. - // - parser p (*this); - pair<value, token> r (p.parse_variable_value (l, gs, &work, var)); - - if (r.second.type != token_type::eos) - fail << "unexpected " << r.second << " in variable assignment " - << "'" << s << "'"; - - // Make sure the value is not typed. - // - if (r.first.type != nullptr) - fail << "typed override of variable " << n; - - // Global and absolute scope overrides we can enter directly. Project - // and relative scope ones will be entered later for each project. - // - if (c == '!' || (dir && dir->absolute ())) - { - scope& s (c == '!' ? gs : *sm.insert_out (*dir)->second.front ()); - - auto p (s.vars.insert (*o)); - assert (p.second); // Variable name is unique. - - value& v (p.first); - v = move (r.first); - } - else - data_->var_overrides.push_back ( - variable_override {var, *o, move (dir), move (r.first)}); - - // Save global overrides for nested contexts. + // Parse any ad hoc project-wide overrides. // - if (c == '!') - data_->global_var_overrides.push_back (s); + if (var_ovr_func != nullptr) + var_ovr_func (*this, i); } // Enter remaining variable patterns and builtin variables. @@ -719,7 +755,8 @@ namespace build2 void context:: enter_project_overrides (scope& rs, const dir_path& out_base, - const variable_overrides& ovrs) + const variable_overrides& ovrs, + scope* as) { // The mildly tricky part here is to distinguish the situation where we // are bootstrapping the same project multiple times. The first override @@ -744,7 +781,7 @@ namespace build2 scope& s ( o.dir ? *sm.insert_out ((out_base / *o.dir).normalize ())->second.front () - : *rs.weak_scope ()); + : *(as != nullptr ? as : (as = rs.weak_scope ()))); auto p (s.vars.insert (o.ovr)); |