From 63a329f81c83b58694571cebb39c3ab8cec935c4 Mon Sep 17 00:00:00 2001 From: Eric Botcazou Date: Thu, 24 May 2018 13:07:06 +0000 Subject: [PATCH] [Ada] Fix irregular output with -gnatR3 This fixes a long-standing quirk present in the layout information for record types displayed by the -gnatR3 switch: when a component has a variable (starting) position, its corresponding line in the output has an irregular and awkward format. After this change, the format is the same as in all the other cases. For the following record: type R (m : natural) is record s : string (1 .. m); r : natural; b : boolean; end record; for R'alignment use 4; pragma Pack (R); the output of -gnatR3 used to be: for R'Object_Size use 17179869248; for R'Value_Size use ((#1 + 8) * 8); for R'Alignment use 4; for R use record m at 0 range 0 .. 30; s at 4 range 0 .. ((#1 * 8)) - 1; r at bit offset (((#1 + 4) * 8)) size in bits = 31 b at bit offset ((((#1 + 7) * 8) + 7)) size in bits = 1 end record; and is changed into: for R'Object_Size use 17179869248; for R'Value_Size use ((#1 + 8) * 8); for R'Alignment use 4; for R use record m at 0 range 0 .. 30; s at 4 range 0 .. ((#1 * 8)) - 1; r at (#1 + 4) range 0 .. 30; b at (#1 + 7) range 7 .. 7; end record; 2018-05-24 Eric Botcazou gcc/ada/ * fe.h (Set_Normalized_First_Bit): Declare. (Set_Normalized_Position): Likewise. * repinfo.adb (List_Record_Layout): Do not use irregular output for a variable position. Fix minor spacing issue. * gcc-interface/decl.c (annotate_rep): If a field has a variable offset, compute the normalized position and annotate it in addition to the bit offset. From-SVN: r260669 --- gcc/ada/ChangeLog | 10 +++++++ gcc/ada/fe.h | 4 +++ gcc/ada/gcc-interface/decl.c | 58 +++++++++++++++++++++++++----------- gcc/ada/repinfo.adb | 24 +-------------- 4 files changed, 56 insertions(+), 40 deletions(-) diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog index 0ea491e1ffc..5ebe69e4de6 100644 --- a/gcc/ada/ChangeLog +++ b/gcc/ada/ChangeLog @@ -1,3 +1,13 @@ +2018-05-24 Eric Botcazou + + * fe.h (Set_Normalized_First_Bit): Declare. + (Set_Normalized_Position): Likewise. + * repinfo.adb (List_Record_Layout): Do not use irregular output for a + variable position. Fix minor spacing issue. + * gcc-interface/decl.c (annotate_rep): If a field has a variable + offset, compute the normalized position and annotate it in addition to + the bit offset. + 2018-05-24 Eric Botcazou * gcc-interface/trans.c (Handled_Sequence_Of_Statements_to_gnu): diff --git a/gcc/ada/fe.h b/gcc/ada/fe.h index 77faac9777a..1928609ba05 100644 --- a/gcc/ada/fe.h +++ b/gcc/ada/fe.h @@ -68,6 +68,8 @@ extern Boolean Debug_Flag_NN; #define Set_Component_Size einfo__set_component_size #define Set_Esize einfo__set_esize #define Set_Mechanism einfo__set_mechanism +#define Set_Normalized_First_Bit einfo__set_normalized_first_bit +#define Set_Normalized_Position einfo__set_normalized_position #define Set_RM_Size einfo__set_rm_size extern void Set_Alignment (Entity_Id, Uint); @@ -75,6 +77,8 @@ extern void Set_Component_Bit_Offset (Entity_Id, Uint); extern void Set_Component_Size (Entity_Id, Uint); extern void Set_Esize (Entity_Id, Uint); extern void Set_Mechanism (Entity_Id, Mechanism_Type); +extern void Set_Normalized_First_Bit (Entity_Id, Uint); +extern void Set_Normalized_Position (Entity_Id, Uint); extern void Set_RM_Size (Entity_Id, Uint); #define Is_Entity_Name einfo__is_entity_name diff --git a/gcc/ada/gcc-interface/decl.c b/gcc/ada/gcc-interface/decl.c index 7a827b742d8..a63cc1887bf 100644 --- a/gcc/ada/gcc-interface/decl.c +++ b/gcc/ada/gcc-interface/decl.c @@ -8291,7 +8291,8 @@ annotate_rep (Entity_Id gnat_entity, tree gnu_type) gnu_list); if (t) { - tree parent_offset; + tree offset = TREE_VEC_ELT (TREE_VALUE (t), 0); + tree bit_offset = TREE_VEC_ELT (TREE_VALUE (t), 2); /* If we are just annotating types and the type is tagged, the tag and the parent components are not generated by the front-end so @@ -8301,31 +8302,46 @@ annotate_rep (Entity_Id gnat_entity, tree gnu_type) && Is_Tagged_Type (gnat_entity) && No (Component_Clause (gnat_field))) { + tree parent_bit_offset; + /* For a component appearing in the current extension, the offset is the size of the parent. */ if (Is_Derived_Type (gnat_entity) && Original_Record_Component (gnat_field) == gnat_field) - parent_offset + parent_bit_offset = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))), bitsizetype); else - parent_offset = bitsize_int (POINTER_SIZE); + parent_bit_offset = bitsize_int (POINTER_SIZE); if (TYPE_FIELDS (gnu_type)) - parent_offset - = round_up (parent_offset, + parent_bit_offset + = round_up (parent_bit_offset, DECL_ALIGN (TYPE_FIELDS (gnu_type))); + + offset + = size_binop (PLUS_EXPR, offset, + fold_convert (sizetype, + size_binop (TRUNC_DIV_EXPR, + parent_bit_offset, + bitsize_unit_node))); + } + + /* If the field has a variable offset, also compute the normalized + position since it's easier to do on trees here than to deduce + it from the annotated expression of Component_Bit_Offset. */ + if (TREE_CODE (offset) != INTEGER_CST) + { + normalize_offset (&offset, &bit_offset, BITS_PER_UNIT); + Set_Normalized_Position (gnat_field, + annotate_value (offset)); + Set_Normalized_First_Bit (gnat_field, + annotate_value (bit_offset)); } - else - parent_offset = bitsize_zero_node; Set_Component_Bit_Offset (gnat_field, - annotate_value - (size_binop (PLUS_EXPR, - bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0), - TREE_VEC_ELT (TREE_VALUE (t), 2)), - parent_offset))); + annotate_value (bit_from_pos (offset, bit_offset))); Set_Esize (gnat_field, annotate_value (DECL_SIZE (TREE_PURPOSE (t)))); @@ -8334,19 +8350,27 @@ annotate_rep (Entity_Id gnat_entity, tree gnu_type) { /* If there is no entry, this is an inherited component whose position is the same as in the parent type. */ - Entity_Id gnat_orig_field = Original_Record_Component (gnat_field); + Entity_Id gnat_orig = Original_Record_Component (gnat_field); /* If we are just annotating types, discriminants renaming those of the parent have no entry so deal with them specifically. */ if (type_annotate_only - && gnat_orig_field == gnat_field + && gnat_orig == gnat_field && Ekind (gnat_field) == E_Discriminant) - gnat_orig_field = Corresponding_Discriminant (gnat_field); + gnat_orig = Corresponding_Discriminant (gnat_field); + + if (Known_Normalized_Position (gnat_orig)) + { + Set_Normalized_Position (gnat_field, + Normalized_Position (gnat_orig)); + Set_Normalized_First_Bit (gnat_field, + Normalized_First_Bit (gnat_orig)); + } Set_Component_Bit_Offset (gnat_field, - Component_Bit_Offset (gnat_orig_field)); + Component_Bit_Offset (gnat_orig)); - Set_Esize (gnat_field, Esize (gnat_orig_field)); + Set_Esize (gnat_field, Esize (gnat_orig)); } } } diff --git a/gcc/ada/repinfo.adb b/gcc/ada/repinfo.adb index 7f7152d7b12..fd7a9319038 100644 --- a/gcc/ada/repinfo.adb +++ b/gcc/ada/repinfo.adb @@ -992,7 +992,6 @@ package body Repinfo is declare Ctyp : constant Entity_Id := Underlying_Type (Etype (Comp)); Esiz : constant Uint := Esize (Comp); - Bofs : constant Uint := Component_Bit_Offset (Comp); Npos : constant Uint := Normalized_Position (Comp); Fbit : constant Uint := Normalized_First_Bit (Comp); Spos : Uint; @@ -1047,35 +1046,14 @@ package body Repinfo is Spaces (Max_Spos_Length - UI_Image_Length); Write_Str (UI_Image_Buffer (1 .. UI_Image_Length)); - elsif Known_Component_Bit_Offset (Comp) - and then List_Representation_Info = 3 - then - Spaces (Max_Spos_Length - 2); - Write_Str ("bit offset "); - - if Starting_Position /= Uint_0 - or else Starting_First_Bit /= Uint_0 - then - UI_Write (Starting_Position * SSU + Starting_First_Bit); - Write_Str (" + "); - end if; - - Write_Val (Bofs, Paren => True); - Write_Str (" size in bits = "); - Write_Val (Esiz, Paren => True); - Write_Eol; - - goto Continue; - elsif Known_Normalized_Position (Comp) and then List_Representation_Info = 3 then Spaces (Max_Spos_Length - 2); if Starting_Position /= Uint_0 then - Write_Char (' '); UI_Write (Starting_Position); - Write_Str (" +"); + Write_Str (" + "); end if; Write_Val (Npos); -- 2.30.2