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authorBoris Kolpackov <boris@codesynthesis.com>2021-06-08 15:30:35 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2021-06-08 15:30:35 +0200
commit26750bd14c715bb616d1779f031b8f5b0ced1bbf (patch)
treef67a1e04ad756b1462cb303dbabba01099106950 /libbuild2/build/script
parent41cdd833e6ea37752be183541cfa5c5fbdc11ab1 (diff)
Redo low verbosity diagnostic deduction to use scope instead of targetadhoc-rule
Diffstat (limited to 'libbuild2/build/script')
-rw-r--r--libbuild2/build/script/parser.cxx30
-rw-r--r--libbuild2/build/script/parser.hxx16
-rw-r--r--libbuild2/build/script/parser.test.cxx2
3 files changed, 26 insertions, 22 deletions
diff --git a/libbuild2/build/script/parser.cxx b/libbuild2/build/script/parser.cxx
index 9194e30..b602880 100644
--- a/libbuild2/build/script/parser.cxx
+++ b/libbuild2/build/script/parser.cxx
@@ -28,7 +28,6 @@ namespace build2
script parser::
pre_parse (const scope& bs,
- const target* tg,
const small_vector<action, 1>& as,
istream& is, const path_name& pn, uint64_t line,
optional<string> diag, const location& diag_loc)
@@ -40,11 +39,11 @@ namespace build2
lexer l (is, *path_, line, lexer_mode::command_line);
set_lexer (&l);
- // The script shouldn't be able to modify the target/scopes.
+ // The script shouldn't be able to modify the scopes.
//
- target_ = const_cast<target*> (tg);
+ target_ = nullptr;
actions_ = &as;
- scope_ = const_cast<scope*> (tg != nullptr ? &tg->base_scope () : &bs);
+ scope_ = const_cast<scope*> (&bs);
root_ = scope_->root_scope ();
pbase_ = scope_->src_path_;
@@ -585,18 +584,12 @@ namespace build2
parse_names_result pr;
{
- // During pre-parse, if the script name is not set manually and we
- // have the target, we suspend pre-parse, parse the command names
- // for real and try to deduce the script name from the result.
- // Otherwise, we continue to pre-parse and bail out after parsing
- // the names.
- //
- // @@ TODO: maybe we could recognize literal names even if target
- // is NULL (see the tests for some ugly recipes). But will need
- // to be careful to still pick up ambiguity between literal and
- // skipped due to target being NULL.
+ // During pre-parse, if the script name is not set manually we
+ // suspend pre-parse, parse the command names for real and try to
+ // deduce the script name from the result. Otherwise, we continue
+ // to pre-parse and bail out after parsing the names.
//
- // Note that the later is not just an optimization since expansion
+ // Note that the latter is not just an optimization since expansion
// that wouldn't fail during execution may fail in this special
// mode, for example:
//
@@ -615,7 +608,7 @@ namespace build2
//
// This is also the reason why we add a diag frame.
//
- if (pre_parse_ && (diag_weight_ != 4 && target_ != nullptr))
+ if (pre_parse_ && diag_weight_ != 4)
{
pre_parse_ = false; // Make parse_names() perform expansions.
pre_parse_suspended_ = true;
@@ -646,7 +639,7 @@ namespace build2
pre_parse_ = true;
}
- if (pre_parse_ && (diag_weight_ == 4 || target_ == nullptr))
+ if (pre_parse_ && diag_weight_ == 4)
return nullopt;
}
@@ -1041,6 +1034,7 @@ namespace build2
// it could be used for (we need scope_ for calling functions such as
// $target.path()).
//
+ target_ = nullptr;
root_ = const_cast<scope*> (&rs);
scope_ = const_cast<scope*> (&bs);
pbase_ = scope_->src_path_;
@@ -1170,7 +1164,7 @@ namespace build2
const variable* pvar (scope_->ctx.var_pool.find (name));
if (pvar != nullptr)
- r = (*target_)[*pvar];
+ r = (*scope_)[*pvar];
}
if (!depdb_clear_)
diff --git a/libbuild2/build/script/parser.hxx b/libbuild2/build/script/parser.hxx
index 8c787f9..948c381 100644
--- a/libbuild2/build/script/parser.hxx
+++ b/libbuild2/build/script/parser.hxx
@@ -32,11 +32,21 @@ namespace build2
parser (context& c): build2::script::parser (c) {}
// Note that the returned script object references the passed path
- // name. Target is NULL if this recipe is shared among multiple
- // targets.
+ // name.
+ //
+ // Note also that we use the scope to lookup variable values while
+ // trying to deduce the low verbosity diagnostics name (see code
+ // around pre_parse_suspended for details). But that means we may
+ // derive such a name based on the wrong value. This can happen if the
+ // expanded variable value is reset after the recipe has been
+ // pre-parsed or if such a value is set on the target (which is where
+ // we start when looking up variables during the real parse). The
+ // current thinking is that a remote possibility of this happening is
+ // acceptable in this situation -- the worst that can happen is that
+ // we will end up with mismatching diagnostics.
//
script
- pre_parse (const scope&, const target*, const small_vector<action, 1>&,
+ pre_parse (const scope&, const small_vector<action, 1>&,
istream&, const path_name&, uint64_t line,
optional<string> diag_name, const location& diag_loc);
diff --git a/libbuild2/build/script/parser.test.cxx b/libbuild2/build/script/parser.test.cxx
index 0bc1c5d..c9356a8 100644
--- a/libbuild2/build/script/parser.test.cxx
+++ b/libbuild2/build/script/parser.test.cxx
@@ -208,7 +208,7 @@ namespace build2
parser p (ctx);
path_name nm ("buildfile");
- script s (p.pre_parse (tt.base_scope (), &tt, acts,
+ script s (p.pre_parse (tt.base_scope (), acts,
cin, nm,
11 /* line */,
(m != mode::diag