From f0bfd1f91fdba41a6d9fa7ada6e02ea8121f604c Mon Sep 17 00:00:00 2001 From: Hristian Kirtchev Date: Tue, 9 Jul 2019 07:55:12 +0000 Subject: [PATCH] [Ada] Elaboration order v4.0 and generic instantiations This patch updates the library graph augmentation mechanism of the elaboration order v4.0 to emulate a particular behavior of the v3.0 scheme involving generic instantiations. If a unit without any elaboration code instantiates a generic without any elaboration code, the invocation edge from the instance to the generic body is not considered for library graph augmentation. ------------ -- Source -- ------------ -- gen_pack1.ads generic type Element_Type is private; package Gen_Pack1 is procedure Read; end Gen_Pack1; -- gen_pack1.adb with Types1; package body Gen_Pack1 is procedure Read is null; end Gen_Pack1; -- types1.ads with Gen_Pack1; package Types1 is procedure Read; package Optional_Numbers is new Gen_Pack1 (Positive); end Types1; -- main1.adb with Types1; procedure Main1 is begin Types1.Optional_Numbers.Read; end Main1; ----------------- -- Compilation -- ----------------- $ gnatmake -q main1.adb 2019-07-09 Hristian Kirtchev gcc/ada/ * bindo-augmentors.adb (Visit_Elaboration_Root): Do not start a DFS from an elaboration root whose corresponding unit lacks elaboration code. This behavior mimics that of the old elaboration order mechanism. * bindo-graphs.adb (Find_All_Cycles_Through_Vertex): Move the vertex tracing within the functional branches of the routine. This prevents spurious trace output. (Has_No_Elaboration_Code): New routine. (Trace_Cycle, Trace_Edge): Update the various Ids to use the "standard" trace format. * bindo-graphs.ads (Has_No_Elaboration_Code): New routine. * bindo-units.ads, bindo-units.adb (Has_No_Elaboration_Code): New routine. From-SVN: r273288 --- gcc/ada/ChangeLog | 16 ++++++++++++++++ gcc/ada/bindo-augmentors.adb | 11 +++++++++++ gcc/ada/bindo-graphs.adb | 30 +++++++++++++++++++++++------- gcc/ada/bindo-graphs.ads | 7 +++++++ gcc/ada/bindo-units.adb | 13 +++++++++++++ gcc/ada/bindo-units.ads | 4 ++++ 6 files changed, 74 insertions(+), 7 deletions(-) diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog index a2c6066c0e2..b191e2d0e21 100644 --- a/gcc/ada/ChangeLog +++ b/gcc/ada/ChangeLog @@ -1,3 +1,19 @@ +2019-07-09 Hristian Kirtchev + + * bindo-augmentors.adb (Visit_Elaboration_Root): Do not start a + DFS from an elaboration root whose corresponding unit lacks + elaboration code. This behavior mimics that of the old + elaboration order mechanism. + * bindo-graphs.adb (Find_All_Cycles_Through_Vertex): Move the + vertex tracing within the functional branches of the routine. + This prevents spurious trace output. + (Has_No_Elaboration_Code): New routine. + (Trace_Cycle, Trace_Edge): Update the various Ids to use the + "standard" trace format. + * bindo-graphs.ads (Has_No_Elaboration_Code): New routine. + * bindo-units.ads, bindo-units.adb (Has_No_Elaboration_Code): + New routine. + 2019-07-09 Piotr Trojanek * ali.ads, bindo-graphs.adb, bindo-validators.adb, clean.adb, diff --git a/gcc/ada/bindo-augmentors.adb b/gcc/ada/bindo-augmentors.adb index bb68a2e4ca5..e0e23386672 100644 --- a/gcc/ada/bindo-augmentors.adb +++ b/gcc/ada/bindo-augmentors.adb @@ -152,6 +152,17 @@ package body Bindo.Augmentors is Visited : IGV_Sets.Membership_Set; begin + -- Nothing to do when the unit where the elaboration root resides + -- lacks elaboration code. This implies that any invocation edges + -- going out of the unit are unwanted. This behavior emulates the + -- old elaboration order mechanism. + + if Has_No_Elaboration_Code (Lib_Graph, Root_Vertex) then + return; + end if; + + -- Prepare the global data + Visited := IGV_Sets.Create (Number_Of_Vertices (Inv_Graph)); Visit_Vertex diff --git a/gcc/ada/bindo-graphs.adb b/gcc/ada/bindo-graphs.adb index 26b0c27f71f..c3ae738c669 100644 --- a/gcc/ada/bindo-graphs.adb +++ b/gcc/ada/bindo-graphs.adb @@ -2356,13 +2356,13 @@ package body Bindo.Graphs is return; end if; - Trace_Vertex (G, Vertex, Indent); - -- The current vertex denotes the end vertex of the cycle and closes -- the circuit. Normalize the cycle such that it is rotated with its -- most significant edge first, and record it for diagnostics. if LGV_Sets.Contains (End_Vertices, Vertex) then + Trace_Vertex (G, Vertex, Indent); + Normalize_And_Add_Cycle (G => G, Most_Significant_Edge => Most_Significant_Edge, @@ -2374,6 +2374,7 @@ package body Bindo.Graphs is -- not been visited yet. elsif not LGV_Sets.Contains (Visited_Vertices, Vertex) then + Trace_Vertex (G, Vertex, Indent); -- Prepare for vertex backtracking @@ -2859,6 +2860,21 @@ package body Bindo.Graphs is return DG.Has_Next (DG.Outgoing_Edge_Iterator (Iter)); end Has_Next; + ----------------------------- + -- Has_No_Elaboration_Code -- + ----------------------------- + + function Has_No_Elaboration_Code + (G : Library_Graph; + Vertex : Library_Graph_Vertex_Id) return Boolean + is + begin + pragma Assert (Present (G)); + pragma Assert (Present (Vertex)); + + return Has_No_Elaboration_Code (Unit (G, Vertex)); + end Has_No_Elaboration_Code; + ----------------------------------------- -- Hash_Library_Graph_Cycle_Attributes -- ----------------------------------------- @@ -4878,7 +4894,7 @@ package body Bindo.Graphs is Next (Iter, Edge); Indent_By (Edge_Indent); - Write_Str ("library graph edge (Edge_"); + Write_Str ("library graph edge (LGE_Id_"); Write_Int (Int (Edge)); Write_Str (")"); Write_Eol; @@ -4912,7 +4928,7 @@ package body Bindo.Graphs is end if; Indent_By (Indent); - Write_Str ("library graph edge (Edge_"); + Write_Str ("library graph edge (LGE_Id_"); Write_Int (Int (Edge)); Write_Str (")"); Write_Eol; @@ -4923,14 +4939,14 @@ package body Bindo.Graphs is Write_Eol; Indent_By (Attr_Indent); - Write_Str ("Predecessor (Vertex_"); + Write_Str ("Predecessor (LGV_Id_"); Write_Int (Int (Pred)); Write_Str (") name = "); Write_Name (Name (G, Pred)); Write_Eol; Indent_By (Attr_Indent); - Write_Str ("Successor (Vertex_"); + Write_Str ("Successor (LGV_Id_"); Write_Int (Int (Succ)); Write_Str (") name = "); Write_Name (Name (G, Succ)); @@ -4977,7 +4993,7 @@ package body Bindo.Graphs is end if; Indent_By (Indent); - Write_Str ("library graph vertex (Vertex_"); + Write_Str ("library graph vertex (LGV_Id_"); Write_Int (Int (Vertex)); Write_Str (")"); Write_Eol; diff --git a/gcc/ada/bindo-graphs.ads b/gcc/ada/bindo-graphs.ads index 53bc4eebe62..86ba823abe3 100644 --- a/gcc/ada/bindo-graphs.ads +++ b/gcc/ada/bindo-graphs.ads @@ -1028,6 +1028,13 @@ package Bindo.Graphs is -- Determine whether library graph G contains a cycle involving pragma -- Elaborate_All. + function Has_No_Elaboration_Code + (G : Library_Graph; + Vertex : Library_Graph_Vertex_Id) return Boolean; + pragma Inline (Has_No_Elaboration_Code); + -- Determine whether vertex Vertex of library graph G represents a unit + -- that lacks elaboration code. + function In_Same_Component (G : Library_Graph; Left : Library_Graph_Vertex_Id; diff --git a/gcc/ada/bindo-units.adb b/gcc/ada/bindo-units.adb index 05b52507f66..8b8fc283a98 100644 --- a/gcc/ada/bindo-units.adb +++ b/gcc/ada/bindo-units.adb @@ -199,6 +199,19 @@ package body Bindo.Units is return Unit_Sets.Has_Next (Unit_Sets.Iterator (Iter)); end Has_Next; + ----------------------------- + -- Has_No_Elaboration_Code -- + ----------------------------- + + function Has_No_Elaboration_Code (U_Id : Unit_Id) return Boolean is + pragma Assert (Present (U_Id)); + + U_Rec : Unit_Record renames ALI.Units.Table (U_Id); + + begin + return U_Rec.No_Elab; + end Has_No_Elaboration_Code; + ------------------------------- -- Hash_Invocation_Signature -- ------------------------------- diff --git a/gcc/ada/bindo-units.ads b/gcc/ada/bindo-units.ads index 37493935f0a..5f045c8b2ef 100644 --- a/gcc/ada/bindo-units.ads +++ b/gcc/ada/bindo-units.ads @@ -81,6 +81,10 @@ package Bindo.Units is pragma Inline (For_Each_Unit); -- Invoke Processor on each unit in the bind + function Has_No_Elaboration_Code (U_Id : Unit_Id) return Boolean; + pragma Inline (Has_No_Elaboration_Code); + -- Determine whether unit U_Id lacks elaboration code + function Hash_Invocation_Signature (IS_Id : Invocation_Signature_Id) return Bucket_Range_Type; pragma Inline (Hash_Invocation_Signature); -- 2.30.2