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Diffstat (limited to 'gcc-4.7/gcc/ada/gnat1drv.adb')
| -rw-r--r-- | gcc-4.7/gcc/ada/gnat1drv.adb | 1244 |
1 files changed, 0 insertions, 1244 deletions
diff --git a/gcc-4.7/gcc/ada/gnat1drv.adb b/gcc-4.7/gcc/ada/gnat1drv.adb deleted file mode 100644 index cd992513a..000000000 --- a/gcc-4.7/gcc/ada/gnat1drv.adb +++ /dev/null @@ -1,1244 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT COMPILER COMPONENTS -- --- -- --- G N A T 1 D R V -- --- -- --- B o d y -- --- -- --- Copyright (C) 1992-2011, 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 Atree; use Atree; -with Back_End; use Back_End; -with Comperr; -with Csets; use Csets; -with Debug; use Debug; -with Elists; -with Errout; use Errout; -with Exp_CG; -with Fmap; -with Fname; use Fname; -with Fname.UF; use Fname.UF; -with Frontend; -with Gnatvsn; use Gnatvsn; -with Hostparm; -with Inline; -with Lib; use Lib; -with Lib.Writ; use Lib.Writ; -with Lib.Xref; -with Namet; use Namet; -with Nlists; -with Opt; use Opt; -with Osint; use Osint; -with Output; use Output; -with Par_SCO; -with Prepcomp; -with Repinfo; use Repinfo; -with Restrict; -with Rident; use Rident; -with Rtsfind; -with SCOs; -with Sem; -with Sem_Ch8; -with Sem_Ch12; -with Sem_Ch13; -with Sem_Elim; -with Sem_Eval; -with Sem_Type; -with Sinfo; use Sinfo; -with Sinput.L; use Sinput.L; -with Snames; -with Sprint; use Sprint; -with Stringt; -with Stylesw; use Stylesw; -with Targparm; use Targparm; -with Tree_Gen; -with Treepr; use Treepr; -with Ttypes; -with Types; use Types; -with Uintp; use Uintp; -with Uname; use Uname; -with Urealp; -with Usage; -with Validsw; use Validsw; - -with System.Assertions; - -procedure Gnat1drv is - Main_Unit_Node : Node_Id; - -- Compilation unit node for main unit - - Main_Kind : Node_Kind; - -- Kind of main compilation unit node - - Back_End_Mode : Back_End.Back_End_Mode_Type; - -- Record back end mode - - procedure Adjust_Global_Switches; - -- There are various interactions between front end switch settings, - -- including debug switch settings and target dependent parameters. - -- This procedure takes care of properly handling these interactions. - -- We do it after scanning out all the switches, so that we are not - -- depending on the order in which switches appear. - - procedure Check_Bad_Body; - -- Called to check if the unit we are compiling has a bad body - - procedure Check_Rep_Info; - -- Called when we are not generating code, to check if -gnatR was requested - -- and if so, explain that we will not be honoring the request. - - procedure Check_Library_Items; - -- For debugging -- checks the behavior of Walk_Library_Items - pragma Warnings (Off, Check_Library_Items); - -- In case the call below is commented out - - ---------------------------- - -- Adjust_Global_Switches -- - ---------------------------- - - procedure Adjust_Global_Switches is - begin - -- Debug flag -gnatd.I is a synonym for Generate_SCIL and requires code - -- generation. - - if Debug_Flag_Dot_II - and then Operating_Mode = Generate_Code - then - Generate_SCIL := True; - end if; - - -- Disable CodePeer_Mode in Check_Syntax, since we need front-end - -- expansion. - - if Operating_Mode = Check_Syntax then - CodePeer_Mode := False; - end if; - - -- Set ASIS mode if -gnatt and -gnatc are set - - if Operating_Mode = Check_Semantics and then Tree_Output then - ASIS_Mode := True; - - -- Turn off inlining in ASIS mode, since ASIS cannot handle the extra - -- information in the trees caused by inlining being active. - - -- More specifically, the tree seems to be malformed from the ASIS - -- point of view if -gnatc and -gnatn appear together??? - - Inline_Active := False; - - -- Turn off SCIL generation and CodePeer mode in semantics mode, - -- since SCIL requires front-end expansion. - - Generate_SCIL := False; - CodePeer_Mode := False; - end if; - - -- SCIL mode needs to disable front-end inlining since the generated - -- trees (in particular order and consistency between specs compiled - -- as part of a main unit or as part of a with-clause) are causing - -- troubles. - - if Generate_SCIL then - Front_End_Inlining := False; - end if; - - -- Tune settings for optimal SCIL generation in CodePeer mode - - if CodePeer_Mode then - - -- Turn off inlining, confuses CodePeer output and gains nothing - - Front_End_Inlining := False; - Inline_Active := False; - - -- Disable front-end optimizations, to keep the tree as close to the - -- source code as possible, and also to avoid inconsistencies between - -- trees when using different optimization switches. - - Optimization_Level := 0; - - -- Enable some restrictions systematically to simplify the generated - -- code (and ease analysis). Note that restriction checks are also - -- disabled in CodePeer mode, see Restrict.Check_Restriction, and - -- user specified Restrictions pragmas are ignored, see - -- Sem_Prag.Process_Restrictions_Or_Restriction_Warnings. - - Restrict.Restrictions.Set (No_Initialize_Scalars) := True; - Restrict.Restrictions.Set (No_Task_Hierarchy) := True; - Restrict.Restrictions.Set (No_Abort_Statements) := True; - Restrict.Restrictions.Set (Max_Asynchronous_Select_Nesting) := True; - Restrict.Restrictions.Value (Max_Asynchronous_Select_Nesting) := 0; - - -- Suppress overflow, division by zero and access checks since they - -- are handled implicitly by CodePeer. - - -- Turn off dynamic elaboration checks: generates inconsistencies in - -- trees between specs compiled as part of a main unit or as part of - -- a with-clause. - - -- Turn off alignment checks: these cannot be proved statically by - -- CodePeer and generate false positives. - - -- Enable all other language checks - - Suppress_Options := - (Access_Check => True, - Alignment_Check => True, - Division_Check => True, - Elaboration_Check => True, - Overflow_Check => True, - others => False); - Enable_Overflow_Checks := False; - Dynamic_Elaboration_Checks := False; - - -- Kill debug of generated code, since it messes up sloc values - - Debug_Generated_Code := False; - - -- Turn cross-referencing on in case it was disabled (e.g. by -gnatD) - -- Do we really need to spend time generating xref in CodePeer - -- mode??? Consider setting Xref_Active to False. - - Xref_Active := True; - - -- Polling mode forced off, since it generates confusing junk - - Polling_Required := False; - - -- Set operating mode to Generate_Code to benefit from full front-end - -- expansion (e.g. generics). - - Operating_Mode := Generate_Code; - - -- We need SCIL generation of course - - Generate_SCIL := True; - - -- Enable assertions and debug pragmas, since they give CodePeer - -- valuable extra information. - - Assertions_Enabled := True; - Debug_Pragmas_Enabled := True; - - -- Disable all simple value propagation. This is an optimization - -- which is valuable for code optimization, and also for generation - -- of compiler warnings, but these are being turned off by default, - -- and CodePeer generates better messages (referencing original - -- variables) this way. - - Debug_Flag_MM := True; - - -- Set normal RM validity checking, and checking of IN OUT parameters - -- (this might give CodePeer more useful checks to analyze, to be - -- confirmed???). All other validity checking is turned off, since - -- this can generate very complex trees that only confuse CodePeer - -- and do not bring enough useful info. - - Reset_Validity_Check_Options; - Validity_Check_Default := True; - Validity_Check_In_Out_Params := True; - Validity_Check_In_Params := True; - - -- Turn off style check options since we are not interested in any - -- front-end warnings when we are getting CodePeer output. - - Reset_Style_Check_Options; - - -- Always perform semantics and generate ali files in CodePeer mode, - -- so that a gnatmake -c -k will proceed further when possible. - - Force_ALI_Tree_File := True; - Try_Semantics := True; - end if; - - -- Set Configurable_Run_Time mode if system.ads flag set - - if Targparm.Configurable_Run_Time_On_Target or Debug_Flag_YY then - Configurable_Run_Time_Mode := True; - end if; - - -- Set -gnatR3m mode if debug flag A set - - if Debug_Flag_AA then - Back_Annotate_Rep_Info := True; - List_Representation_Info := 1; - List_Representation_Info_Mechanisms := True; - end if; - - -- Force Target_Strict_Alignment true if debug flag -gnatd.a is set - - if Debug_Flag_Dot_A then - Ttypes.Target_Strict_Alignment := True; - end if; - - -- Disable static allocation of dispatch tables if -gnatd.t or if layout - -- is enabled. The front end's layout phase currently treats types that - -- have discriminant-dependent arrays as not being static even when a - -- discriminant constraint on the type is static, and this leads to - -- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ??? - - if Debug_Flag_Dot_T or else Frontend_Layout_On_Target then - Static_Dispatch_Tables := False; - end if; - - -- Flip endian mode if -gnatd8 set - - if Debug_Flag_8 then - Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian; - end if; - - -- Deal with forcing OpenVMS switches True if debug flag M is set, but - -- record the setting of Targparm.Open_VMS_On_Target in True_VMS_Target - -- before doing this, so we know if we are in real OpenVMS or not! - - Opt.True_VMS_Target := Targparm.OpenVMS_On_Target; - - if Debug_Flag_M then - Targparm.OpenVMS_On_Target := True; - Hostparm.OpenVMS := True; - end if; - - -- Activate front end layout if debug flag -gnatdF is set - - if Debug_Flag_FF then - Targparm.Frontend_Layout_On_Target := True; - end if; - - -- Set and check exception mechanism - - if Targparm.ZCX_By_Default_On_Target then - Exception_Mechanism := Back_End_Exceptions; - end if; - - -- Set proper status for overflow checks. We turn on overflow checks if - -- -gnatp was not specified, and either -gnato is set or the back-end - -- takes care of overflow checks. Otherwise we suppress overflow checks - -- by default (since front end checks are expensive). - - if not Opt.Suppress_Checks - and then (Opt.Enable_Overflow_Checks - or else - (Targparm.Backend_Divide_Checks_On_Target - and - Targparm.Backend_Overflow_Checks_On_Target)) - then - Suppress_Options (Overflow_Check) := False; - else - Suppress_Options (Overflow_Check) := True; - end if; - - -- Set switch indicating if we can use N_Expression_With_Actions - - -- Debug flag -gnatd.X decisively sets usage on - - if Debug_Flag_Dot_XX then - Use_Expression_With_Actions := True; - - -- Debug flag -gnatd.Y decisively sets usage off - - elsif Debug_Flag_Dot_YY then - Use_Expression_With_Actions := False; - - -- Otherwise this feature is implemented, so we allow its use - - else - Use_Expression_With_Actions := True; - end if; - - -- Set switch indicating if back end can handle limited types, and - -- guarantee that no incorrect copies are made (e.g. in the context - -- of a conditional expression). - - -- Debug flag -gnatd.L decisively sets usage on - - if Debug_Flag_Dot_LL then - Back_End_Handles_Limited_Types := True; - - -- If no debug flag, usage off for AAMP, VM, SCIL cases - - elsif AAMP_On_Target - or else VM_Target /= No_VM - or else Generate_SCIL - then - Back_End_Handles_Limited_Types := False; - - -- Otherwise normal gcc back end, for now still turn flag off by - -- default, since there are unresolved problems in the front end. - - else - Back_End_Handles_Limited_Types := False; - end if; - - -- Set switches for formal verification mode - - if Debug_Flag_Dot_FF then - - Alfa_Mode := True; - - -- Set strict standard interpretation of compiler permissions - - if Debug_Flag_Dot_DD then - Strict_Alfa_Mode := True; - end if; - - -- Turn off inlining, which would confuse formal verification output - -- and gain nothing. - - Front_End_Inlining := False; - Inline_Active := False; - - -- Disable front-end optimizations, to keep the tree as close to the - -- source code as possible, and also to avoid inconsistencies between - -- trees when using different optimization switches. - - Optimization_Level := 0; - - -- Enable some restrictions systematically to simplify the generated - -- code (and ease analysis). Note that restriction checks are also - -- disabled in Alfa mode, see Restrict.Check_Restriction, and user - -- specified Restrictions pragmas are ignored, see - -- Sem_Prag.Process_Restrictions_Or_Restriction_Warnings. - - Restrict.Restrictions.Set (No_Initialize_Scalars) := True; - - -- Suppress all language checks since they are handled implicitly by - -- the formal verification backend. - -- Turn off dynamic elaboration checks. - -- Turn off alignment checks. - -- Turn off validity checking. - - Suppress_Options := (others => True); - Enable_Overflow_Checks := False; - Dynamic_Elaboration_Checks := False; - Reset_Validity_Check_Options; - - -- Kill debug of generated code, since it messes up sloc values - - Debug_Generated_Code := False; - - -- Turn cross-referencing on in case it was disabled (e.g. by -gnatD) - -- as it is needed for computing effects of subprograms in the formal - -- verification backend. - - Xref_Active := True; - - -- Polling mode forced off, since it generates confusing junk - - Polling_Required := False; - - -- Set operating mode to Generate_Code, but full front-end expansion - -- is not desirable in Alfa mode, so a light expansion is performed - -- instead. - - Operating_Mode := Generate_Code; - - -- Skip call to gigi - - Debug_Flag_HH := True; - - -- Disable Expressions_With_Actions nodes - - -- The gnat2why backend does not deal with Expressions_With_Actions - -- in all places (in particular assertions). It is difficult to - -- determine in the frontend which cases are allowed, so we disable - -- Expressions_With_Actions entirely. Even in the cases where - -- gnat2why deals with Expressions_With_Actions, it is easier to - -- deal with the original constructs (quantified, conditional and - -- case expressions) instead of the rewritten ones. - - Use_Expression_With_Actions := False; - - -- Enable assertions and debug pragmas, since they give valuable - -- extra information for formal verification. - - Assertions_Enabled := True; - Debug_Pragmas_Enabled := True; - - -- Turn off style check options since we are not interested in any - -- front-end warnings when we are getting Alfa output. - - Reset_Style_Check_Options; - - -- Suppress compiler warnings, since what we are interested in here - -- is what formal verification can find out. - - Warning_Mode := Suppress; - - -- Suppress the generation of name tables for enumerations, which are - -- not needed for formal verification, and fall outside the Alfa - -- subset (use of pointers). - - Global_Discard_Names := True; - - -- Suppress the expansion of tagged types and dispatching calls, - -- which lead to the generation of non-Alfa code (use of pointers), - -- which is more complex to formally verify than the original source. - - Tagged_Type_Expansion := False; - end if; - end Adjust_Global_Switches; - - -------------------- - -- Check_Bad_Body -- - -------------------- - - procedure Check_Bad_Body is - Sname : Unit_Name_Type; - Src_Ind : Source_File_Index; - Fname : File_Name_Type; - - procedure Bad_Body_Error (Msg : String); - -- Issue message for bad body found - - -------------------- - -- Bad_Body_Error -- - -------------------- - - procedure Bad_Body_Error (Msg : String) is - begin - Error_Msg_N (Msg, Main_Unit_Node); - Error_Msg_File_1 := Fname; - Error_Msg_N ("remove incorrect body in file{!", Main_Unit_Node); - end Bad_Body_Error; - - -- Start of processing for Check_Bad_Body - - begin - -- Nothing to do if we are only checking syntax, because we don't know - -- enough to know if we require or forbid a body in this case. - - if Operating_Mode = Check_Syntax then - return; - end if; - - -- Check for body not allowed - - if (Main_Kind = N_Package_Declaration - and then not Body_Required (Main_Unit_Node)) - or else (Main_Kind = N_Generic_Package_Declaration - and then not Body_Required (Main_Unit_Node)) - or else Main_Kind = N_Package_Renaming_Declaration - or else Main_Kind = N_Subprogram_Renaming_Declaration - or else Nkind (Original_Node (Unit (Main_Unit_Node))) - in N_Generic_Instantiation - then - Sname := Unit_Name (Main_Unit); - - -- If we do not already have a body name, then get the body name - -- (but how can we have a body name here???) - - if not Is_Body_Name (Sname) then - Sname := Get_Body_Name (Sname); - end if; - - Fname := Get_File_Name (Sname, Subunit => False); - Src_Ind := Load_Source_File (Fname); - - -- Case where body is present and it is not a subunit. Exclude the - -- subunit case, because it has nothing to do with the package we are - -- compiling. It is illegal for a child unit and a subunit with the - -- same expanded name (RM 10.2(9)) to appear together in a partition, - -- but there is nothing to stop a compilation environment from having - -- both, and the test here simply allows that. If there is an attempt - -- to include both in a partition, this is diagnosed at bind time. In - -- Ada 83 mode this is not a warning case. - - -- Note: if weird file names are being used, we can have a situation - -- where the file name that supposedly contains body in fact contains - -- a spec, or we can't tell what it contains. Skip the error message - -- in these cases. - - -- Also ignore body that is nothing but pragma No_Body; (that's the - -- whole point of this pragma, to be used this way and to cause the - -- body file to be ignored in this context). - - if Src_Ind /= No_Source_File - and then Get_Expected_Unit_Type (Fname) = Expect_Body - and then not Source_File_Is_Subunit (Src_Ind) - and then not Source_File_Is_No_Body (Src_Ind) - then - Errout.Finalize (Last_Call => False); - - Error_Msg_Unit_1 := Sname; - - -- Ada 83 case of a package body being ignored. This is not an - -- error as far as the Ada 83 RM is concerned, but it is almost - -- certainly not what is wanted so output a warning. Give this - -- message only if there were no errors, since otherwise it may - -- be incorrect (we may have misinterpreted a junk spec as not - -- needing a body when it really does). - - if Main_Kind = N_Package_Declaration - and then Ada_Version = Ada_83 - and then Operating_Mode = Generate_Code - and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body - and then not Compilation_Errors - then - Error_Msg_N - ("package $$ does not require a body?", Main_Unit_Node); - Error_Msg_File_1 := Fname; - Error_Msg_N ("body in file{? will be ignored", Main_Unit_Node); - - -- Ada 95 cases of a body file present when no body is - -- permitted. This we consider to be an error. - - else - -- For generic instantiations, we never allow a body - - if Nkind (Original_Node (Unit (Main_Unit_Node))) - in N_Generic_Instantiation - then - Bad_Body_Error - ("generic instantiation for $$ does not allow a body"); - - -- A library unit that is a renaming never allows a body - - elsif Main_Kind in N_Renaming_Declaration then - Bad_Body_Error - ("renaming declaration for $$ does not allow a body!"); - - -- Remaining cases are packages and generic packages. Here - -- we only do the test if there are no previous errors, - -- because if there are errors, they may lead us to - -- incorrectly believe that a package does not allow a body - -- when in fact it does. - - elsif not Compilation_Errors then - if Main_Kind = N_Package_Declaration then - Bad_Body_Error - ("package $$ does not allow a body!"); - - elsif Main_Kind = N_Generic_Package_Declaration then - Bad_Body_Error - ("generic package $$ does not allow a body!"); - end if; - end if; - - end if; - end if; - end if; - end Check_Bad_Body; - - ------------------------- - -- Check_Library_Items -- - ------------------------- - - -- Walk_Library_Items has plenty of assertions, so all we need to do is - -- call it, just for these assertions, not actually doing anything else. - - procedure Check_Library_Items is - - procedure Action (Item : Node_Id); - -- Action passed to Walk_Library_Items to do nothing - - ------------ - -- Action -- - ------------ - - procedure Action (Item : Node_Id) is - begin - null; - end Action; - - procedure Walk is new Sem.Walk_Library_Items (Action); - - -- Start of processing for Check_Library_Items - - begin - Walk; - end Check_Library_Items; - - -------------------- - -- Check_Rep_Info -- - -------------------- - - procedure Check_Rep_Info is - begin - if List_Representation_Info /= 0 - or else List_Representation_Info_Mechanisms - then - Set_Standard_Error; - Write_Eol; - Write_Str - ("cannot generate representation information, no code generated"); - Write_Eol; - Write_Eol; - Set_Standard_Output; - end if; - end Check_Rep_Info; - --- Start of processing for Gnat1drv - -begin - -- This inner block is set up to catch assertion errors and constraint - -- errors. Since the code for handling these errors can cause another - -- exception to be raised (namely Unrecoverable_Error), we need two - -- nested blocks, so that the outer one handles unrecoverable error. - - begin - -- Initialize all packages. For the most part, these initialization - -- calls can be made in any order. Exceptions are as follows: - - -- Lib.Initialize need to be called before Scan_Compiler_Arguments, - -- because it initializes a table filled by Scan_Compiler_Arguments. - - Osint.Initialize; - Fmap.Reset_Tables; - Lib.Initialize; - Lib.Xref.Initialize; - Scan_Compiler_Arguments; - Osint.Add_Default_Search_Dirs; - - Nlists.Initialize; - Sinput.Initialize; - Sem.Initialize; - Exp_CG.Initialize; - Csets.Initialize; - Uintp.Initialize; - Urealp.Initialize; - Errout.Initialize; - SCOs.Initialize; - Snames.Initialize; - Stringt.Initialize; - Inline.Initialize; - Par_SCO.Initialize; - Sem_Ch8.Initialize; - Sem_Ch12.Initialize; - Sem_Ch13.Initialize; - Sem_Elim.Initialize; - Sem_Eval.Initialize; - Sem_Type.Init_Interp_Tables; - - -- Acquire target parameters from system.ads (source of package System) - - declare - use Sinput; - - S : Source_File_Index; - N : File_Name_Type; - - begin - Name_Buffer (1 .. 10) := "system.ads"; - Name_Len := 10; - N := Name_Find; - S := Load_Source_File (N); - - if S = No_Source_File then - Write_Line - ("fatal error, run-time library not installed correctly"); - Write_Line ("cannot locate file system.ads"); - raise Unrecoverable_Error; - - -- Remember source index of system.ads (which was read successfully) - - else - System_Source_File_Index := S; - end if; - - Targparm.Get_Target_Parameters - (System_Text => Source_Text (S), - Source_First => Source_First (S), - Source_Last => Source_Last (S)); - - -- Acquire configuration pragma information from Targparm - - Restrict.Restrictions := Targparm.Restrictions_On_Target; - end; - - Adjust_Global_Switches; - - -- Output copyright notice if full list mode unless we have a list - -- file, in which case we defer this so that it is output in the file - - if (Verbose_Mode or else (Full_List and then Full_List_File_Name = null)) - and then not Debug_Flag_7 - then - Write_Eol; - Write_Str ("GNAT "); - Write_Str (Gnat_Version_String); - Write_Eol; - Write_Str ("Copyright 1992-" & Current_Year - & ", Free Software Foundation, Inc."); - Write_Eol; - end if; - - -- Check we do not have more than one source file, this happens only in - -- the case where the driver is called directly, it cannot happen when - -- gnat1 is invoked from gcc in the normal case. - - if Osint.Number_Of_Files /= 1 then - Usage; - Write_Eol; - Osint.Fail ("you must provide one source file"); - - elsif Usage_Requested then - Usage; - end if; - - Original_Operating_Mode := Operating_Mode; - Frontend; - - -- Exit with errors if the main source could not be parsed. Also, when - -- -gnatd.H is present, the source file is not set. - - if Sinput.Main_Source_File = No_Source_File then - - -- Handle -gnatd.H debug mode - - if Debug_Flag_Dot_HH then - - -- For -gnatd.H, lock all the tables to keep the convention that - -- the backend needs to unlock the tables it wants to touch. - - Atree.Lock; - Elists.Lock; - Fname.UF.Lock; - Inline.Lock; - Lib.Lock; - Nlists.Lock; - Sem.Lock; - Sinput.Lock; - Namet.Lock; - Stringt.Lock; - - -- And all we need to do is to call the back end - - Back_End.Call_Back_End (Back_End.Generate_Object); - end if; - - Errout.Finalize (Last_Call => True); - Errout.Output_Messages; - Exit_Program (E_Errors); - end if; - - Main_Unit_Node := Cunit (Main_Unit); - Main_Kind := Nkind (Unit (Main_Unit_Node)); - Check_Bad_Body; - - -- In CodePeer mode we always delete old SCIL files before regenerating - -- new ones, in case of e.g. errors, and also to remove obsolete scilx - -- files generated by CodePeer itself. - - if CodePeer_Mode then - Comperr.Delete_SCIL_Files; - end if; - - -- Exit if compilation errors detected - - Errout.Finalize (Last_Call => False); - - if Compilation_Errors then - Treepr.Tree_Dump; - Sem_Ch13.Validate_Unchecked_Conversions; - Sem_Ch13.Validate_Address_Clauses; - Sem_Ch13.Validate_Independence; - Errout.Output_Messages; - Namet.Finalize; - - -- Generate ALI file if specially requested - - if Opt.Force_ALI_Tree_File then - Write_ALI (Object => False); - Tree_Gen; - end if; - - Errout.Finalize (Last_Call => True); - Exit_Program (E_Errors); - end if; - - -- Set Generate_Code on main unit and its spec. We do this even if are - -- not generating code, since Lib-Writ uses this to determine which - -- units get written in the ali file. - - Set_Generate_Code (Main_Unit); - - -- If we have a corresponding spec, and it comes from source or it is - -- not a generated spec for a child subprogram body, then we need object - -- code for the spec unit as well. - - if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body - and then not Acts_As_Spec (Main_Unit_Node) - then - if Nkind (Unit (Main_Unit_Node)) = N_Subprogram_Body - and then not Comes_From_Source (Library_Unit (Main_Unit_Node)) - then - null; - else - Set_Generate_Code - (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node))); - end if; - end if; - - -- Case of no code required to be generated, exit indicating no error - - if Original_Operating_Mode = Check_Syntax then - Treepr.Tree_Dump; - Errout.Finalize (Last_Call => True); - Errout.Output_Messages; - Tree_Gen; - Namet.Finalize; - Check_Rep_Info; - - -- Use a goto instead of calling Exit_Program so that finalization - -- occurs normally. - - goto End_Of_Program; - - elsif Original_Operating_Mode = Check_Semantics then - Back_End_Mode := Declarations_Only; - - -- All remaining cases are cases in which the user requested that code - -- be generated (i.e. no -gnatc or -gnats switch was used). Check if we - -- can in fact satisfy this request. - - -- Cannot generate code if someone has turned off code generation for - -- any reason at all. We will try to figure out a reason below. - - elsif Operating_Mode /= Generate_Code then - Back_End_Mode := Skip; - - -- We can generate code for a subprogram body unless there were missing - -- subunits. Note that we always generate code for all generic units (a - -- change from some previous versions of GNAT). - - elsif Main_Kind = N_Subprogram_Body and then not Subunits_Missing then - Back_End_Mode := Generate_Object; - - -- We can generate code for a package body unless there are subunits - -- missing (note that we always generate code for generic units, which - -- is a change from some earlier versions of GNAT). - - elsif Main_Kind = N_Package_Body and then not Subunits_Missing then - Back_End_Mode := Generate_Object; - - -- We can generate code for a package declaration or a subprogram - -- declaration only if it does not required a body. - - elsif Nkind_In (Main_Kind, - N_Package_Declaration, - N_Subprogram_Declaration) - and then - (not Body_Required (Main_Unit_Node) - or else - Distribution_Stub_Mode = Generate_Caller_Stub_Body) - then - Back_End_Mode := Generate_Object; - - -- We can generate code for a generic package declaration of a generic - -- subprogram declaration only if does not require a body. - - elsif Nkind_In (Main_Kind, N_Generic_Package_Declaration, - N_Generic_Subprogram_Declaration) - and then not Body_Required (Main_Unit_Node) - then - Back_End_Mode := Generate_Object; - - -- Compilation units that are renamings do not require bodies, so we can - -- generate code for them. - - elsif Nkind_In (Main_Kind, N_Package_Renaming_Declaration, - N_Subprogram_Renaming_Declaration) - then - Back_End_Mode := Generate_Object; - - -- Compilation units that are generic renamings do not require bodies - -- so we can generate code for them. - - elsif Main_Kind in N_Generic_Renaming_Declaration then - Back_End_Mode := Generate_Object; - - -- It's not an error to generate SCIL for e.g. a spec which has a body - - elsif CodePeer_Mode then - Back_End_Mode := Generate_Object; - - -- In all other cases (specs which have bodies, generics, and bodies - -- where subunits are missing), we cannot generate code and we generate - -- a warning message. Note that generic instantiations are gone at this - -- stage since they have been replaced by their instances. - - else - Back_End_Mode := Skip; - end if; - - -- At this stage Back_End_Mode is set to indicate if the backend should - -- be called to generate code. If it is Skip, then code generation has - -- been turned off, even though code was requested by the original - -- command. This is not an error from the user point of view, but it is - -- an error from the point of view of the gcc driver, so we must exit - -- with an error status. - - -- We generate an informative message (from the gcc point of view, it - -- is an error message, but from the users point of view this is not an - -- error, just a consequence of compiling something that cannot - -- generate code). - - if Back_End_Mode = Skip then - Set_Standard_Error; - Write_Str ("cannot generate code for "); - Write_Str ("file "); - Write_Name (Unit_File_Name (Main_Unit)); - - if Subunits_Missing then - Write_Str (" (missing subunits)"); - Write_Eol; - - -- Force generation of ALI file, for backward compatibility - - Opt.Force_ALI_Tree_File := True; - - elsif Main_Kind = N_Subunit then - Write_Str (" (subunit)"); - Write_Eol; - - -- Force generation of ALI file, for backward compatibility - - Opt.Force_ALI_Tree_File := True; - - elsif Main_Kind = N_Subprogram_Declaration then - Write_Str (" (subprogram spec)"); - Write_Eol; - - -- Generic package body in GNAT implementation mode - - elsif Main_Kind = N_Package_Body and then GNAT_Mode then - Write_Str (" (predefined generic)"); - Write_Eol; - - -- Force generation of ALI file, for backward compatibility - - Opt.Force_ALI_Tree_File := True; - - -- Only other case is a package spec - - else - Write_Str (" (package spec)"); - Write_Eol; - end if; - - Set_Standard_Output; - - Sem_Ch13.Validate_Unchecked_Conversions; - Sem_Ch13.Validate_Address_Clauses; - Sem_Ch13.Validate_Independence; - Errout.Finalize (Last_Call => True); - Errout.Output_Messages; - Treepr.Tree_Dump; - Tree_Gen; - - -- Generate ALI file if specially requested, or for missing subunits, - -- subunits or predefined generic. - - if Opt.Force_ALI_Tree_File then - Write_ALI (Object => False); - end if; - - Namet.Finalize; - Check_Rep_Info; - - -- Exit program with error indication, to kill object file - - Exit_Program (E_No_Code); - end if; - - -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also set - -- as indicated by Back_Annotate_Rep_Info being set to True. - - -- We don't call for annotations on a subunit, because to process those - -- the back-end requires that the parent(s) be properly compiled. - - -- Annotation is suppressed for targets where front-end layout is - -- enabled, because the front end determines representations. - - -- Annotation is also suppressed in the case of compiling for a VM, - -- since representations are largely symbolic there. - - if Back_End_Mode = Declarations_Only - and then (not (Back_Annotate_Rep_Info or Generate_SCIL) - or else Main_Kind = N_Subunit - or else Targparm.Frontend_Layout_On_Target - or else Targparm.VM_Target /= No_VM) - then - Sem_Ch13.Validate_Unchecked_Conversions; - Sem_Ch13.Validate_Address_Clauses; - Sem_Ch13.Validate_Independence; - Errout.Finalize (Last_Call => True); - Errout.Output_Messages; - Write_ALI (Object => False); - Tree_Dump; - Tree_Gen; - Namet.Finalize; - Check_Rep_Info; - return; - end if; - - -- Ensure that we properly register a dependency on system.ads, since - -- even if we do not semantically depend on this, Targparm has read - -- system parameters from the system.ads file. - - Lib.Writ.Ensure_System_Dependency; - - -- Add dependencies, if any, on preprocessing data file and on - -- preprocessing definition file(s). - - Prepcomp.Add_Dependencies; - - -- Back end needs to explicitly unlock tables it needs to touch - - Atree.Lock; - Elists.Lock; - Fname.UF.Lock; - Inline.Lock; - Lib.Lock; - Nlists.Lock; - Sem.Lock; - Sinput.Lock; - Namet.Lock; - Stringt.Lock; - - -- ???Check_Library_Items under control of a debug flag, because it - -- currently does not work if the -gnatn switch (back end inlining) is - -- used. - - if Debug_Flag_Dot_WW then - Check_Library_Items; - end if; - - -- Here we call the back end to generate the output code - - Generating_Code := True; - Back_End.Call_Back_End (Back_End_Mode); - - -- Once the backend is complete, we unlock the names table. This call - -- allows a few extra entries, needed for example for the file name for - -- the library file output. - - Namet.Unlock; - - -- Generate the call-graph output of dispatching calls - - Exp_CG.Generate_CG_Output; - - -- Validate unchecked conversions (using the values for size and - -- alignment annotated by the backend where possible). - - Sem_Ch13.Validate_Unchecked_Conversions; - - -- Validate address clauses (again using alignment values annotated - -- by the backend where possible). - - Sem_Ch13.Validate_Address_Clauses; - - -- Validate independence pragmas (again using values annotated by - -- the back end for component layout etc.) - - Sem_Ch13.Validate_Independence; - - -- Now we complete output of errors, rep info and the tree info. These - -- are delayed till now, since it is perfectly possible for gigi to - -- generate errors, modify the tree (in particular by setting flags - -- indicating that elaboration is required, and also to back annotate - -- representation information for List_Rep_Info. - - Errout.Finalize (Last_Call => True); - Errout.Output_Messages; - List_Rep_Info; - - -- Only write the library if the backend did not generate any error - -- messages. Otherwise signal errors to the driver program so that - -- there will be no attempt to generate an object file. - - if Compilation_Errors then - Treepr.Tree_Dump; - Exit_Program (E_Errors); - end if; - - Write_ALI (Object => (Back_End_Mode = Generate_Object)); - - if not Compilation_Errors then - - -- In case of ada backends, we need to make sure that the generated - -- object file has a timestamp greater than the ALI file. We do this - -- to make gnatmake happy when checking the ALI and obj timestamps, - -- where it expects the object file being written after the ali file. - - -- Gnatmake's assumption is true for gcc platforms where the gcc - -- wrapper needs to call the assembler after calling gnat1, but is - -- not true for ada backends, where the object files are created - -- directly by gnat1 (so are created before the ali file). - - Back_End.Gen_Or_Update_Object_File; - end if; - - -- Generate ASIS tree after writing the ALI file, since in ASIS mode, - -- Write_ALI may in fact result in further tree decoration from the - -- original tree file. Note that we dump the tree just before generating - -- it, so that the dump will exactly reflect what is written out. - - Treepr.Tree_Dump; - Tree_Gen; - - -- Finalize name table and we are all done - - Namet.Finalize; - - exception - -- Handle fatal internal compiler errors - - when Rtsfind.RE_Not_Available => - Comperr.Compiler_Abort ("RE_Not_Available"); - - when System.Assertions.Assert_Failure => - Comperr.Compiler_Abort ("Assert_Failure"); - - when Constraint_Error => - Comperr.Compiler_Abort ("Constraint_Error"); - - when Program_Error => - Comperr.Compiler_Abort ("Program_Error"); - - when Storage_Error => - - -- Assume this is a bug. If it is real, the message will in any case - -- say Storage_Error, giving a strong hint! - - Comperr.Compiler_Abort ("Storage_Error"); - end; - - <<End_Of_Program>> - null; - - -- The outer exception handles an unrecoverable error - -exception - when Unrecoverable_Error => - Errout.Finalize (Last_Call => True); - Errout.Output_Messages; - - Set_Standard_Error; - Write_Str ("compilation abandoned"); - Write_Eol; - - Set_Standard_Output; - Source_Dump; - Tree_Dump; - Exit_Program (E_Errors); - -end Gnat1drv; |