| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- F R O N T E N D -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2021, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
| -- http://www.gnu.org/licenses for a complete copy of the license. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with System.Strings; use System.Strings; |
| |
| with Atree; use Atree; |
| with Checks; |
| with CStand; |
| with Debug; use Debug; |
| with Elists; |
| with Exp_Dbug; |
| with Exp_Unst; |
| with Fmap; |
| with Fname.UF; |
| with Ghost; use Ghost; |
| with Inline; use Inline; |
| with Lib; use Lib; |
| with Lib.Load; use Lib.Load; |
| with Lib.Xref; |
| with Live; use Live; |
| with Namet; use Namet; |
| with Nlists; use Nlists; |
| with Opt; use Opt; |
| with Osint; |
| with Par; |
| with Prep; |
| with Prepcomp; |
| with Restrict; use Restrict; |
| with Rident; use Rident; |
| with Rtsfind; |
| with Snames; use Snames; |
| with Sprint; |
| with Scn; use Scn; |
| with Sem; use Sem; |
| with Sem_Aux; |
| with Sem_Ch8; |
| with Sem_SCIL; |
| with Sem_Elab; use Sem_Elab; |
| with Sem_Prag; use Sem_Prag; |
| with Sem_Warn; |
| with Sinfo; use Sinfo; |
| with Sinfo.Nodes; use Sinfo.Nodes; |
| with Sinfo.Utils; use Sinfo.Utils; |
| with Sinput; use Sinput; |
| with Sinput.L; use Sinput.L; |
| with SCIL_LL; |
| with Tbuild; use Tbuild; |
| with Types; use Types; |
| with VAST; |
| |
| procedure Frontend is |
| begin |
| -- Carry out package initializations. These are initializations which might |
| -- logically be performed at elaboration time, were it not for the fact |
| -- that we may be doing things more than once in the big loop over files. |
| -- Like elaboration, the order in which these calls are made is in some |
| -- cases important. For example, Lib cannot be initialized before Namet, |
| -- since it uses names table entries. |
| |
| Rtsfind.Initialize; |
| Nlists.Initialize; |
| Elists.Initialize; |
| Lib.Load.Initialize; |
| Sem_Aux.Initialize; |
| Sem_Ch8.Initialize; |
| Sem_Prag.Initialize; |
| Fname.UF.Initialize; |
| Checks.Initialize; |
| Sem_Warn.Initialize; |
| Prep.Initialize; |
| Sem_Elab.Initialize; |
| |
| if Generate_SCIL then |
| SCIL_LL.Initialize; |
| end if; |
| |
| -- Create package Standard |
| |
| CStand.Create_Standard; |
| |
| -- Check possible symbol definitions specified by -gnateD switches |
| |
| Prepcomp.Process_Command_Line_Symbol_Definitions; |
| |
| -- If -gnatep= was specified, parse the preprocessing data file |
| |
| if Preprocessing_Data_File /= null then |
| Name_Len := Preprocessing_Data_File'Length; |
| Name_Buffer (1 .. Name_Len) := Preprocessing_Data_File.all; |
| Prepcomp.Parse_Preprocessing_Data_File (Name_Find); |
| |
| -- Otherwise, check if there were preprocessing symbols on the command |
| -- line and set preprocessing if there are. |
| |
| else |
| Prepcomp.Check_Symbols; |
| end if; |
| |
| -- We set Parsing_Main_Extended_Source true here to cover processing of all |
| -- the configuration pragma files, as well as the main source unit itself. |
| |
| Parsing_Main_Extended_Source := True; |
| |
| -- Now that the preprocessing situation is established, we are able to |
| -- load the main source (this is no longer done by Lib.Load.Initialize). |
| |
| Lib.Load.Load_Main_Source; |
| |
| -- Return immediately if the main source could not be found |
| |
| if Sinput.Main_Source_File <= No_Source_File then |
| return; |
| end if; |
| |
| -- Read and process configuration pragma files if present |
| |
| declare |
| Dot_Gnat_Adc : constant File_Name_Type := Name_Find ("./gnat.adc"); |
| Gnat_Adc : constant File_Name_Type := Name_Find ("gnat.adc"); |
| |
| Save_Style_Check : constant Boolean := Opt.Style_Check; |
| -- Save style check mode so it can be restored later |
| |
| Config_Pragmas : List_Id := Empty_List; |
| -- Gather configuration pragmas |
| |
| Source_Config_File : Source_File_Index; |
| -- Source reference for -gnatec configuration file |
| |
| Prag : Node_Id; |
| |
| begin |
| -- We always analyze config files with style checks off, since we |
| -- don't want a miscellaneous gnat.adc that is around to discombobulate |
| -- intended -gnatg or -gnaty compilations. We also disconnect checking |
| -- for maximum line length. |
| |
| Opt.Style_Check := False; |
| Style_Check := False; |
| |
| -- Capture current suppress options, which may get modified |
| |
| Scope_Suppress := Opt.Suppress_Options; |
| |
| -- First deal with gnat.adc file |
| |
| if Opt.Config_File then |
| Source_gnat_adc := Load_Config_File (Gnat_Adc); |
| |
| -- Case of gnat.adc file present |
| |
| if Source_gnat_adc > No_Source_File then |
| |
| -- Parse the gnat.adc file for configuration pragmas |
| |
| Initialize_Scanner (No_Unit, Source_gnat_adc); |
| Config_Pragmas := Par (Configuration_Pragmas => True); |
| |
| -- We add a compilation dependency for gnat.adc so that if it |
| -- changes, we force a recompilation. |
| |
| Prepcomp.Add_Dependency (Source_gnat_adc); |
| end if; |
| end if; |
| |
| -- Now deal with specified config pragmas files if there are any |
| |
| if Opt.Config_File_Names /= null then |
| |
| -- Loop through config pragmas files |
| |
| for Index in Opt.Config_File_Names'Range loop |
| declare |
| Len : constant Natural := Config_File_Names (Index)'Length; |
| Str : constant String (1 .. Len) := |
| Config_File_Names (Index).all; |
| |
| Config_Name : constant File_Name_Type := Name_Find (Str); |
| Temp_File : constant Boolean := |
| Len > 4 |
| and then |
| (Str (Len - 3 .. Len) = ".TMP" |
| or else |
| Str (Len - 3 .. Len) = ".tmp"); |
| -- Extension indicating a temporary config file? |
| |
| begin |
| -- Skip it if it's the default name, already loaded above. |
| -- Otherwise, we get confusing warning messages about seeing |
| -- the same thing twice. |
| |
| if Config_Name /= Gnat_Adc |
| and then Config_Name /= Dot_Gnat_Adc |
| then |
| -- Load the file, error if we did not find it |
| |
| Source_Config_File := Load_Config_File (Config_Name); |
| |
| if Source_Config_File <= No_Source_File then |
| Osint.Fail |
| ("cannot find configuration pragmas file " |
| & Config_File_Names (Index).all); |
| |
| -- If we did find the file, and it is not a temporary file, |
| -- then we add a compilation dependency for it so that if it |
| -- changes, we force a recompilation. |
| |
| elsif not Temp_File then |
| Prepcomp.Add_Dependency (Source_Config_File); |
| end if; |
| |
| -- Parse the config pragmas file, and accumulate results |
| |
| Initialize_Scanner (No_Unit, Source_Config_File); |
| Append_List_To |
| (Config_Pragmas, Par (Configuration_Pragmas => True)); |
| end if; |
| end; |
| end loop; |
| end if; |
| |
| -- Now analyze all pragmas except those whose analysis must be |
| -- deferred till after the main unit is analyzed. |
| |
| if Config_Pragmas /= Error_List |
| and then Operating_Mode /= Check_Syntax |
| then |
| Prag := First (Config_Pragmas); |
| while Present (Prag) loop |
| if not Delay_Config_Pragma_Analyze (Prag) then |
| Analyze_Pragma (Prag); |
| end if; |
| |
| Next (Prag); |
| end loop; |
| end if; |
| |
| -- Restore style check, but if config file turned on checks, leave on |
| |
| Opt.Style_Check := Save_Style_Check or Style_Check; |
| |
| -- Capture any modifications to suppress options from config pragmas |
| |
| Opt.Suppress_Options := Scope_Suppress; |
| |
| -- If a target dependency info file has been read through switch |
| -- -gnateT=, add it to the dependencies. |
| |
| if Target_Dependent_Info_Read_Name /= null then |
| declare |
| Index : Source_File_Index; |
| begin |
| Name_Len := 0; |
| Add_Str_To_Name_Buffer (Target_Dependent_Info_Read_Name.all); |
| Index := Load_Config_File (Name_Enter); |
| Prepcomp.Add_Dependency (Index); |
| end; |
| end if; |
| |
| -- This is where we can capture the value of the compilation unit |
| -- specific restrictions that have been set by the config pragma |
| -- files (or from Targparm), for later restoration when processing |
| -- e.g. subunits. |
| |
| Save_Config_Cunit_Boolean_Restrictions; |
| |
| -- If there was a -gnatem switch, initialize the mappings of unit names |
| -- to file names and of file names to path names from the mapping file. |
| |
| if Mapping_File_Name /= null then |
| Fmap.Initialize (Mapping_File_Name.all); |
| end if; |
| |
| -- Adjust Optimize_Alignment mode from debug switches if necessary |
| |
| if Debug_Flag_Dot_SS then |
| Optimize_Alignment := 'S'; |
| elsif Debug_Flag_Dot_TT then |
| Optimize_Alignment := 'T'; |
| end if; |
| |
| -- We have now processed the command line switches, and the |
| -- configuration pragma files, so this is the point at which we want to |
| -- capture the values of the configuration switches (see Opt for further |
| -- details). |
| |
| Register_Config_Switches; |
| |
| -- Check for file which contains No_Body pragma |
| |
| if Source_File_Is_No_Body (Source_Index (Main_Unit)) then |
| Change_Main_Unit_To_Spec; |
| end if; |
| |
| -- Initialize the scanner. Note that we do this after the call to |
| -- Create_Standard, which uses the scanner in its processing of |
| -- floating-point bounds. |
| |
| Initialize_Scanner (Main_Unit, Source_Index (Main_Unit)); |
| |
| -- Here we call the parser to parse the compilation unit (or units in |
| -- the check syntax mode, but in that case we won't go on to the |
| -- semantics in any case). |
| |
| Discard_List (Par (Configuration_Pragmas => False)); |
| Parsing_Main_Extended_Source := False; |
| |
| -- The main unit is now loaded, and subunits of it can be loaded, |
| -- without reporting spurious loading circularities. |
| |
| Set_Loading (Main_Unit, False); |
| |
| -- Now that the main unit is installed, we can complete the analysis |
| -- of the pragmas in gnat.adc and the configuration file, that require |
| -- a context for their semantic processing. |
| |
| if Config_Pragmas /= Error_List |
| and then Operating_Mode /= Check_Syntax |
| |
| -- Do not attempt to process deferred configuration pragmas if the |
| -- main unit failed to load, to avoid cascaded inconsistencies that |
| -- can lead to a compiler crash. |
| |
| and then Fatal_Error (Main_Unit) /= Error_Detected |
| then |
| -- Pragmas that require some semantic activity, such as |
| -- Interrupt_State, cannot be processed until the main unit is |
| -- installed, because they require a compilation unit on which to |
| -- attach with_clauses, etc. So analyze them now. |
| |
| declare |
| Prag : Node_Id; |
| |
| begin |
| Prag := First (Config_Pragmas); |
| while Present (Prag) loop |
| |
| -- Guard against the case where a configuration pragma may be |
| -- split into multiple pragmas and the original rewritten as a |
| -- null statement. |
| |
| if Nkind (Prag) = N_Pragma |
| and then Delay_Config_Pragma_Analyze (Prag) |
| then |
| Analyze_Pragma (Prag); |
| end if; |
| |
| Next (Prag); |
| end loop; |
| end; |
| end if; |
| |
| -- If we have restriction No_Exception_Propagation, and we did not have |
| -- an explicit switch turning off Warn_On_Non_Local_Exception, then turn |
| -- on this warning by default if we have encountered an exception |
| -- handler. |
| |
| if Restriction_Check_Required (No_Exception_Propagation) |
| and then not No_Warn_On_Non_Local_Exception |
| and then Exception_Handler_Encountered |
| then |
| Warn_On_Non_Local_Exception := True; |
| end if; |
| |
| -- Disable Initialize_Scalars for runtime files to avoid circular |
| -- dependencies. |
| |
| if Initialize_Scalars |
| and then Fname.Is_Predefined_File_Name (File_Name (Main_Source_File)) |
| then |
| Initialize_Scalars := False; |
| Init_Or_Norm_Scalars := Normalize_Scalars; |
| end if; |
| |
| -- Now on to the semantics. Skip if in syntax only mode |
| |
| if Operating_Mode /= Check_Syntax then |
| |
| -- Install the configuration pragmas in the tree |
| |
| Set_Config_Pragmas |
| (Aux_Decls_Node (Cunit (Main_Unit)), Config_Pragmas); |
| |
| -- Following steps are skipped if we had a fatal error during parsing |
| |
| if Fatal_Error (Main_Unit) /= Error_Detected then |
| |
| -- Reset Operating_Mode to Check_Semantics for subunits. We cannot |
| -- actually generate code for subunits, so we suppress expansion. |
| -- This also corrects certain problems that occur if we try to |
| -- incorporate subunits at a lower level. |
| |
| if Operating_Mode = Generate_Code |
| and then Nkind (Unit (Cunit (Main_Unit))) = N_Subunit |
| then |
| Operating_Mode := Check_Semantics; |
| end if; |
| |
| -- Analyze (and possibly expand) main unit |
| |
| Scope_Suppress := Suppress_Options; |
| Semantics (Cunit (Main_Unit)); |
| |
| -- Cleanup processing after completing main analysis |
| |
| -- In GNATprove_Mode we do not perform most expansions but body |
| -- instantiation is needed. |
| |
| pragma Assert |
| (Operating_Mode = Generate_Code |
| or else Operating_Mode = Check_Semantics); |
| |
| if Operating_Mode = Generate_Code |
| or else GNATprove_Mode |
| then |
| Instantiate_Bodies; |
| end if; |
| |
| -- Analyze all inlined bodies, check access-before-elaboration |
| -- rules, and remove ignored Ghost code when generating code or |
| -- compiling for GNATprove. |
| |
| if Operating_Mode = Generate_Code or else GNATprove_Mode then |
| if Inline_Processing_Required then |
| Analyze_Inlined_Bodies; |
| end if; |
| |
| -- Remove entities from program that do not have any execution |
| -- time references. |
| |
| if Debug_Flag_UU then |
| Collect_Garbage_Entities; |
| end if; |
| |
| if Legacy_Elaboration_Checks then |
| Check_Elab_Calls; |
| end if; |
| |
| -- Examine all top level scenarios collected during analysis |
| -- and resolution. Diagnose conditional ABEs, install run-time |
| -- checks to catch conditional ABEs, and guarantee the prior |
| -- elaboration of external units. |
| |
| Check_Elaboration_Scenarios; |
| |
| -- Examine all top level scenarios collected during analysis and |
| -- resolution in order to diagnose conditional ABEs, even in the |
| -- presence of serious errors. |
| |
| else |
| Check_Elaboration_Scenarios; |
| end if; |
| |
| -- At this stage we can unnest subprogram bodies if required |
| |
| if Total_Errors_Detected = 0 then |
| Exp_Unst.Unnest_Subprograms (Cunit (Main_Unit)); |
| end if; |
| |
| -- List library units if requested |
| |
| if List_Units then |
| Lib.List; |
| end if; |
| |
| -- Output waiting warning messages |
| |
| Lib.Xref.Process_Deferred_References; |
| Sem_Warn.Output_Non_Modified_In_Out_Warnings; |
| Sem_Warn.Output_Unreferenced_Messages; |
| Sem_Warn.Check_Unused_Withs; |
| Sem_Warn.Output_Unused_Warnings_Off_Warnings; |
| |
| -- Remove any ignored Ghost code as it must not appear in the |
| -- executable. This action must be performed last because it |
| -- heavily alters the tree. |
| |
| if Operating_Mode = Generate_Code or else GNATprove_Mode then |
| Remove_Ignored_Ghost_Code; |
| end if; |
| end if; |
| end if; |
| end; |
| |
| -- Qualify all entity names in inner packages, package bodies, etc |
| |
| if not GNATprove_Mode then |
| Exp_Dbug.Qualify_All_Entity_Names; |
| end if; |
| |
| -- SCIL backend requirement. Check that SCIL nodes associated with |
| -- dispatching calls reference subprogram calls. |
| |
| if Generate_SCIL then |
| pragma Debug (Sem_SCIL.Check_SCIL_Nodes (Cunit (Main_Unit))); |
| null; |
| end if; |
| |
| -- Verify the validity of the tree |
| |
| if Debug_Flag_Underscore_VV then |
| VAST.Check_Tree (Cunit (Main_Unit)); |
| end if; |
| |
| -- Dump the source now. Note that we do this as soon as the analysis |
| -- of the tree is complete, because it is not just a dump in the case |
| -- of -gnatD, where it rewrites all source locations in the tree. |
| |
| Sprint.Source_Dump; |
| |
| -- Check again for configuration pragmas that appear in the context |
| -- of the main unit. These pragmas only affect the main unit, and the |
| -- corresponding flag is reset after each call to Semantics, but they |
| -- may affect the generated ali for the unit, and therefore the flag |
| -- must be set properly after compilation. Currently we only check for |
| -- Initialize_Scalars, but others should be checked: as well??? |
| |
| declare |
| Item : Node_Id; |
| |
| begin |
| Item := First (Context_Items (Cunit (Main_Unit))); |
| while Present (Item) loop |
| if Nkind (Item) = N_Pragma |
| and then Pragma_Name (Item) = Name_Initialize_Scalars |
| then |
| Initialize_Scalars := True; |
| end if; |
| |
| Next (Item); |
| end loop; |
| end; |
| |
| -- If a mapping file has been specified by a -gnatem switch, update |
| -- it if there has been some sources that were not in the mappings. |
| |
| if Mapping_File_Name /= null then |
| Fmap.Update_Mapping_File (Mapping_File_Name.all); |
| end if; |
| |
| return; |
| end Frontend; |
