------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- L I B . W R I T -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2013, 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. -- -- -- ------------------------------------------------------------------------------ -- This package contains the routines for writing the library information package Lib.Writ is ----------------------------------- -- Format of Library Information -- ----------------------------------- -- This section describes the format of the library information that is -- associated with object files. The exact method of this association is -- potentially implementation dependent and is described and implemented in -- package ali. From the point of view of the description here, all we need -- to know is that the information is represented as a string of characters -- that is somehow associated with an object file, and can be retrieved. If -- no library information exists for a given object file, then we take this -- as equivalent to the non-existence of the object file, as if source file -- has not been previously compiled. -- The library information is written as a series of lines of the form: -- Key_Character parameter parameter ... -- The following sections describe the format of these lines in detail -------------------------------------- -- Making Changes to the ALI Format -- -------------------------------------- -- A number of tools use ali.adb to parse ali files. This means that -- changes to this format can cause old versions of these tools to be -- incompatible with new versions of the compiler. Any changes to ali file -- formats must be carefully evaluated to understand any such possible -- conflicts, and in particular, it is very undesirable to create conflicts -- between older versions of GPS and newer versions of the compiler. -- If the following guidelines are respected, downward compatibility -- problems (old tools reading new ali files) should be minimized: -- The basic key character format must be kept -- The V line must be the first line, this is checked by ali.adb even in -- Ignore_Errors mode, and is used to verify that the file at hand is -- indeed likely intended to be an ali file. -- The P line must be present, though may be modified in contents -- according to remaining guidelines. Again, ali.adb assumes the P -- line is present even in Ignore_Errors mode. -- New modifiers can generally be added (in particular adding new two -- letter modifiers to the P or U lines is always safe) -- Adding entirely new lines (with a new key letter) to the ali file is -- always safe, at any point (other than before the V line), since such -- lines will be ignored. -- Following the guidelines in this section should ensure that this problem -- is minimized and that old tools will be able to deal successfully with -- new ali formats. Note that this does not apply to the compiler itself, -- which always requires consistency between the ali files and the binder. -- That is because one of the main functions of the binder is to ensure -- consistency of the partition, and this can be compromised if the ali -- files are inconsistent. ------------------ -- Header Lines -- ------------------ -- The initial header lines in the file give information about the -- compilation environment, and identify other special information such as -- main program parameters. -- ---------------- -- -- V Version -- -- ---------------- -- V "xxxxxxxxxxxxxxxx" -- -- This line indicates the library output version, as defined in -- Gnatvsn. It ensures that separate object modules of a program are -- consistent. It has to be changed if anything changes which would -- affect successful binding of separately compiled modules. Examples -- of such changes are modifications in the format of the library info -- described in this package, or modifications to calling sequences, or -- to the way that data is represented. -- Note: the V line absolutely must be the first line, and no change -- to the ALI format should change this, since even in Ignore_Errors -- mode, Scan_ALI insists on finding a V line. -- --------------------- -- -- M Main Program -- -- --------------------- -- M type [priority] [T=time-slice] [AB] [C=cpu] W=? -- This line appears only if the main unit for this file is suitable -- for use as a main program. The parameters are: -- type -- P for a parameterless procedure -- F for a function returning a value of integral type -- (used for writing a main program returning an exit status) -- priority -- Present only if there was a valid pragma Priority in the -- corresponding unit to set the main task priority. It is an -- unsigned decimal integer. -- T=time-slice -- Present only if there was a valid pragma Time_Slice in the -- corresponding unit. It is an unsigned decimal integer in the -- range 0 .. 10**9 giving the time slice value in units of -- milliseconds. The actual significance of this parameter is -- target dependent. -- AB -- Present if there is an allocator in the body of the procedure -- after the BEGIN. This will be a violation of the restriction -- No_Allocators_After_Elaboration if it is present, and this -- unit is used as a main program (only the binder can find the -- violation, since only the binder knows the main program). -- C=cpu -- Present only if there was a valid pragma CPU in the -- corresponding unit to set the main task affinity. It is an -- unsigned decimal integer. -- W=? -- This parameter indicates the wide character encoding method used -- when compiling the main program file. The ? character is the -- single character used in the -gnatW? switch. This is used to -- provide the default wide-character encoding for Wide_Text_IO -- files. -- ----------------- -- -- A Argument -- -- ----------------- -- A argument -- One of these lines appears for each of the arguments present in the -- call to the gnat1 program. This can be used if it is necessary to -- reconstruct this call (e.g. for fix and continue). -- ------------------- -- -- P Parameters -- -- ------------------- -- P <> -- Indicates various information that applies to the compilation of the -- corresponding source file. Parameters is a sequence of zero or more -- two letter codes that indicate configuration pragmas and other -- parameters that apply: -- The arguments are as follows: -- CE Compilation errors. If this is present it means that the ali -- file resulted from a compilation with the -gnatQ switch set, -- and illegalities were detected. The ali file contents may -- not be completely reliable, but the format will be correct -- and complete. Note that NO is always present if CE is -- present. -- DB Detect_Blocking pragma is in effect for all units in this -- file. -- Ex A valid Partition_Elaboration_Policy pragma applies to all -- the units in this file, where x is the first character -- (upper case) of the policy name (e.g. 'C' for Concurrent). -- FD Configuration pragmas apply to all the units in this file -- specifying a possibly non-standard floating point format -- (VAX float with Long_Float using D_Float). -- FG Configuration pragmas apply to all the units in this file -- specifying a possibly non-standard floating point format -- (VAX float with Long_Float using G_Float). -- FI Configuration pragmas apply to all the units in this file -- specifying a possibly non-standard floating point format -- (IEEE Float). -- Lx A valid Locking_Policy pragma applies to all the units in -- this file, where x is the first character (upper case) of -- the policy name (e.g. 'C' for Ceiling_Locking). -- NO No object. This flag indicates that the units in this file -- were not compiled to produce an object. This can occur as a -- result of the use of -gnatc, or if no object can be produced -- (e.g. when a package spec is compiled instead of the body, -- or a subunit on its own). -- NR No_Run_Time. Indicates that a pragma No_Run_Time applies -- to all units in the file. -- NS Normalize_Scalars pragma in effect for all units in -- this file. -- Qx A valid Queueing_Policy pragma applies to all the units -- in this file, where x is the first character (upper case) -- of the policy name (e.g. 'P' for Priority_Queueing). -- SL Indicates that the unit is an Interface to a Standalone -- Library. Note that this indication is never given by the -- compiler, but is added by the Project Manager in gnatmake -- when an Interface ALI file is copied to the library -- directory. -- SS This unit references System.Secondary_Stack (that is, -- the unit makes use of the secondary stack facilities). -- Tx A valid Task_Dispatching_Policy pragma applies to all -- the units in this file, where x is the first character -- (upper case) of the corresponding policy name (e.g. 'F' -- for FIFO_Within_Priorities). -- UA Unreserve_All_Interrupts pragma was processed in one or -- more units in this file -- ZX Units in this file use zero-cost exceptions and have -- generated exception tables. If ZX is not present, the -- longjmp/setjmp exception scheme is in use. -- Note that language defined units never output policy (Lx, Tx, Qx) -- parameters. Language defined units must correctly handle all -- possible cases. These values are checked for consistency by the -- binder and then copied to the generated binder output file. -- Note: The P line must be present. Even in Ignore_Errors mode, Scan_ALI -- insists on finding a P line. So if changes are made to the ALI format, -- they should not include removing the P line! -- --------------------- -- -- R Restrictions -- -- --------------------- -- There are two forms for R lines, positional and named. The positional -- notation is now considered obsolescent, it is not generated by the most -- recent versions of the compiler except under control of the debug switch -- -gnatdR, but is still recognized by the binder. -- The recognition by the binder is to ease the transition, and better deal -- with some cases of inconsistent builds using incompatible versions of -- the compiler and binder. The named notation is the current preferred -- approach. -- Note that R lines are generated using the information in unit Rident, -- and intepreted by the binder using the information in System.Rident. -- Normally these two units should be effectively identical. However in -- some cases of inconsistent builds, they may be different. This may lead -- to binder diagnostics, which can be suppressed using the -C switch for -- the binder, which results in ignoring unrecognized restrictions in the -- ali files. -- --------------------------------------- -- -- R Restrictions (Positional Form) -- -- --------------------------------------- -- The first R line records the status of restrictions generated by pragma -- Restrictions encountered, as well as information on what the compiler -- has been able to determine with respect to restrictions violations. -- The format is: -- R <> <> -- The first parameter is a string of characters that records -- information regarding restrictions that do not take parameter not -- take parameter values. It is a string of characters, one character -- for each value (in order) in All_Boolean_Restrictions. There are -- three possible settings for each restriction: -- r Restricted. Unit was compiled under control of a pragma -- Restrictions for the corresponding restriction. In this case -- the unit certainly does not violate the Restriction, since -- this would have been detected by the compiler. -- n Not used. The unit was not compiled under control of a pragma -- Restrictions for the corresponding restriction, and does not -- make any use of the referenced feature. -- v Violated. The unit was not compiled under control of a pragma -- Restrictions for the corresponding restriction, and it does -- indeed use the referenced feature. -- This information is used in the binder to check consistency, i.e. to -- detect cases where one unit has "r" and another unit has "v", which -- is not permitted, since these restrictions are partition-wide. -- The second parameter, which immediately follows the first (with no -- separating space) gives restriction information for identifiers for -- which a parameter is given. -- The parameter is a string of entries, one for each value in -- Restrict.All_Parameter_Restrictions. Each entry has two components -- in sequence, the first indicating whether or not there is a -- restriction, and the second indicating whether or not the compiler -- detected violations. In the boolean case it is not necessary to -- separate these, since if a restriction is set, and violated, that is -- an error. But in the parameter case, this is not true. For example, -- we can have a unit with a pragma Restrictions (Max_Tasks => 4), -- where the compiler can detect that there are exactly three tasks -- declared. Both of these pieces of information must be passed to the -- binder. The parameter of 4 is important in case the total number of -- tasks in the partition is greater than 4. The parameter of 3 is -- important in case some other unit has a restrictions pragma with -- Max_Tasks=>2. -- The component for the presence of restriction has one of two -- possible forms: -- n No pragma for this restriction is present in the set of units -- for this ali file. -- rN At least one pragma for this restriction is present in the -- set of units for this ali file. The value N is the minimum -- parameter value encountered in any such pragma. N is in the -- range of Integer (a value larger than N'Last causes the -- pragma to be ignored). -- The component for the violation detection has one of three -- possible forms: -- n No violations were detected by the compiler -- vN A violation was detected. N is either the maximum or total -- count of violations (depending on the checking type) in all -- the units represented by the ali file). Note that this -- setting is only allowed for restrictions that are in -- Checked_[Max|Sum]_Parameter_Restrictions. The value here is -- known to be exact by the compiler and is in the range of -- Natural. -- vN+ A violation was detected. The compiler cannot determine -- the exact count of violations, but it is at least N. -- There are no spaces within the parameter string, so the entry -- described above in the header of this section for Max_Tasks would -- appear as the string r4v3. -- Note: The restrictions line is required to be present. Even in -- Ignore_Errors mode, Scan_ALI expects to find an R line and will -- signal a fatal error if it is missing. This means that future -- changes to the ALI file format must retain the R line. -- ---------------------------------- -- -- R Restrictions (Named Form) -- -- ---------------------------------- -- The first R line for named form announces that named notation will be -- used, and also assures that there is at least one R line present, which -- makes parsing of ali files simpler. A blank line preceds the RN line. -- RN -- In named notation, the restrictions are given as a series of lines, one -- per retrictions that is specified or violated (no information is present -- for restrictions that are not specified or violated). In the following -- name is the name of the restriction in all upper case. -- For boolean restrictions, we have only two possibilities. A restrictions -- pragma is present, or a violation is detected: -- RR name -- A restriction pragma is present for the named boolean restriction. -- No violations were detected by the compiler (or the unit in question -- would have been found to be illegal). -- RV name -- No restriction pragma is present for the named boolean restriction. -- However, the compiler did detect one or more violations of this -- restriction, which may require a binder consistency check. Note that -- one case of a violation is the use of a Restriction_Set attribute for -- the restriction that yielded False. -- For the case of restrictions that take a parameter, we need both the -- information from pragma if present, and the actual information about -- what possible violations occur. For example, we can have a unit with -- a pragma Restrictions (Max_Tasks => 4), where the compiler can detect -- that there are exactly three tasks declared. Both of these pieces -- of information must be passed to the binder. The parameter of 4 is -- important in case the total number of tasks in the partition is greater -- than 4. The parameter of 3 is important in case some other unit has a -- restrictions pragma with Max_Tasks=>2. -- RR name=N -- A restriction pragma is present for the named restriction which is -- one of the restrictions taking a parameter. The value N (a decimal -- integer) is the value given in the restriction pragma. -- RV name=N -- A restriction pragma may or may not be present for the restriction -- given by name (one of the restrictions taking a parameter). But in -- either case, the compiler detected possible violations. N (a decimal -- integer) is the maximum or total count of violations (depending -- on the checking type) in all the units represented by the ali file). -- The value here is known to be exact by the compiler and is in the -- range of Natural. Note that if an RR line is present for the same -- restriction, then the value in the RV line cannot exceed the value -- in the RR line (since otherwise the compiler would have detected a -- violation of the restriction). -- RV name=N+ -- Similar to the above, but the compiler cannot determine the exact -- count of violations, but it is at least N. -- ------------------------------------------------- -- -- R Restrictions (No_Dependence Information) -- -- ------------------------------------------------- -- Subsequent R lines are present only if pragma Restriction No_Dependence -- is used. There is one such line for each such pragma appearing in the -- extended main unit. The format is: -- R unit_name -- Here the unit name is in all lower case. The components of the unit -- name are separated by periods. The names themselves are in encoded -- form, as documented in Namet. -- ------------------------- -- -- I Interrupt States -- -- ------------------------- -- I interrupt-number interrupt-state line-number -- This line records information from an Interrupt_State pragma. There -- is one line for each separate pragma, and if no such pragmas are -- used, then no I lines are present. -- The interrupt-number is an unsigned positive integer giving the -- value of the interrupt as defined in Ada.Interrupts.Names. -- The interrupt-state is one of r/s/u for Runtime/System/User -- The line number is an unsigned decimal integer giving the line -- number of the corresponding Interrupt_State pragma. This is used -- in consistency messages. -- -------------------------------------- -- -- S Priority Specific Dispatching -- -- -------------------------------------- -- S policy_identifier first_priority last_priority line-number -- This line records information from a Priority_Specific_Dispatching -- pragma. There is one line for each separate pragma, and if no such -- pragmas are used, then no S lines are present. -- The policy_identifier is the first character (upper case) of the -- corresponding policy name (e.g. 'F' for FIFO_Within_Priorities). -- The first_priority and last_priority fields define the range of -- priorities to which the specified dispatching policy apply. -- The line number is an unsigned decimal integer giving the line -- number of the corresponding Priority_Specific_Dispatching pragma. -- This is used in consistency messages. ---------------------------- -- Compilation Unit Lines -- ---------------------------- -- Following these header lines, a set of information lines appears for -- each compilation unit that appears in the corresponding object file. In -- particular, when a package body or subprogram body is compiled, there -- will be two sets of information, one for the spec and one for the body, -- with the entry for the body appearing first. This is the only case in -- which a single ALI file contains more than one unit (in particular note -- that subunits do *not* count as compilation units for this purpose, and -- generate no library information, since they are inlined). -- -------------------- -- -- U Unit Header -- -- -------------------- -- The lines for each compilation unit have the following form -- U unit-name source-name version <> -- This line identifies the unit to which this section of the library -- information file applies. The first three parameters are the unit -- name in internal format, as described in package Uname, and the name -- of the source file containing the unit. -- Version is the version given as eight hexadecimal characters with -- upper case letters. This value is the exclusive or of the source -- checksums of the unit and all its semantically dependent units. -- The <> are a series of two letter codes indicating -- information about the unit: -- BD Unit does not have pragma Elaborate_Body, but the elaboration -- circuit has determined that it would be a good idea if this -- pragma were present, since the body of the package contains -- elaboration code that modifies one or more variables in the -- visible part of the package. The binder will try, but does -- not promise, to keep the elaboration of the body close to -- the elaboration of the spec. -- DE Dynamic Elaboration. This unit was compiled with the dynamic -- elaboration model, as set by either the -gnatE switch or -- pragma Elaboration_Checks (Dynamic). -- -- EB Unit has pragma Elaborate_Body, or is a generic instance that -- has a body. Set for instances because RM 12.3(20) requires -- that the body be immediately elaborated after the spec (we -- would normally do that anyway, because elaborate spec and -- body together whenever possible, and for an instance it is -- always possible; however setting EB ensures that this is done -- even when using the -p gnatbind switch). -- EE Elaboration entity is present which must be set true when -- the unit is elaborated. The name of the elaboration entity is -- formed from the unit name in the usual way. If EE is present, -- then this boolean must be set True as part of the elaboration -- processing routine generated by the binder. Note that EE can -- be set even if NE is set. This happens when the boolean is -- needed solely for checking for the case of access before -- elaboration. -- GE Unit is a generic declaration, or corresponding body -- -- IL Unit source uses a style with identifiers in all lower-case -- IU (IL) or all upper case (IU). If the standard mixed-case usage -- is detected, or the compiler cannot determine the style, then -- no I parameter will appear. -- IS Initialize_Scalars pragma applies to this unit, or else there -- is at least one use of the Invalid_Value attribute. -- KM Unit source uses a style with keywords in mixed case (KM) -- KU or all upper case (KU). If the standard lower-case usage is -- is detected, or the compiler cannot determine the style, then -- no K parameter will appear. -- NE Unit has no elaboration routine. All subprogram bodies and -- specs are in this category. Package bodies and specs may or -- may not have NE set, depending on whether or not elaboration -- code is required. Set if N_Compilation_Unit node has flag -- Has_No_Elaboration_Code set. -- OL The units in this file are compiled with a local pragma -- Optimize_Alignment, so no consistency requirement applies -- to these units. All internal units have this status since -- they have an automatic default of Optimize_Alignment (Off). -- -- OO Optimize_Alignment (Off) is the default setting for all -- units in this file. All files in the partition that specify -- a default must specify the same default. -- OS Optimize_Alignment (Space) is the default setting for all -- units in this file. All files in the partition that specify -- a default must specify the same default. -- OT Optimize_Alignment (Time) is the default setting for all -- units in this file. All files in the partition that specify -- a default must specify the same default. -- PF The unit has a library-level (package) finalizer -- PK Unit is package, rather than a subprogram -- PU Unit has pragma Pure -- PR Unit has pragma Preelaborate -- RA Unit declares a Remote Access to Class-Wide (RACW) type -- RC Unit has pragma Remote_Call_Interface -- RT Unit has pragma Remote_Types -- SP Unit has pragma Shared_Passive. -- SU Unit is a subprogram, rather than a package -- The attributes may appear in any order, separated by spaces. -- ----------------------------- -- -- W, Y and Z Withed Units -- -- ----------------------------- -- Following each U line, is a series of lines of the form -- W unit-name [source-name lib-name] [E] [EA] [ED] [AD] -- or -- Y unit-name [source-name lib-name] [E] [EA] [ED] [AD] -- or -- Z unit-name [source-name lib-name] [E] [EA] [ED] [AD] -- One W line is present for each unit that is mentioned in an explicit -- non-limited with clause by the current unit. One Y line is present -- for each unit that is mentioned in an explicit limited with clause -- by the current unit. One Z line is present for each unit that is -- only implicitly withed by the current unit. The first parameter is -- the unit name in internal format. The second parameter is the file -- name of the file that must be compiled to compile this unit. It is -- usually the file for the body, except for packages which have no -- body. For units that need a body, if the source file for the body -- cannot be found, the file name of the spec is used instead. The -- third parameter is the file name of the library information file -- that contains the results of compiling this unit. The optional -- modifiers are used as follows: -- E pragma Elaborate applies to this unit -- EA pragma Elaborate_All applies to this unit -- ED Elaborate_Desirable set for this unit, which means that there -- is no Elaborate, but the analysis suggests that Program_Error -- may be raised if the Elaborate conditions cannot be satisfied. -- The binder will attempt to treat ED as E if it can. -- AD Elaborate_All_Desirable set for this unit, which means that -- there is no Elaborate_All, but the analysis suggests that -- Program_Error may be raised if the Elaborate_All conditions -- cannot be satisfied. The binder will attempt to treat AD as -- EA if it can. -- The parameter source-name and lib-name are omitted for the case of a -- generic unit compiled with earlier versions of GNAT which did not -- generate object or ali files for generics. For compatibility in the -- bootstrap path we continue to omit these entries for predefined -- generic units, even though we do now generate object and ali files. -- However, in SPARK mode, we always generate source-name and lib-name -- parameters. Bootstrap issues do not apply there, and we need this -- information to properly compute frame conditions of subprograms. -- The parameter source-name and lib-name are also omitted for the W -- lines that result from use of a Restriction_Set attribute which gets -- a result of False from a No_Dependence check, in the case where the -- unit is not in the semantic closure. In such a case, the bare W -- line is generated, but no D (dependency) line. This will make the -- binder do the consistency check, but not include the unit in the -- partition closure (unless it is properly With'ed somewhere). -- ----------------------- -- -- L Linker_Options -- -- ----------------------- -- Following the W lines (if any, or the U line if not), are an optional -- series of lines that indicates the usage of the pragma Linker_Options in -- the associated unit. For each appearance of a pragma Linker_Options (or -- Link_With) in the unit, a line is present with the form: -- L "string" -- where string is the string from the unit line enclosed in quotes. -- Within the quotes the following can occur: -- c graphic characters in range 20-7E other than " or { -- "" indicating a single " character -- {hh} indicating a character whose code is hex hh (0-9,A-F) -- {00} [ASCII.NUL] is used as a separator character -- to separate multiple arguments of a single -- Linker_Options pragma. -- For further details, see Stringt.Write_String_Table_Entry. Note that -- wide characters in the form {hhhh} cannot be produced, since pragma -- Linker_Option accepts only String, not Wide_String. -- The L lines are required to appear in the same order as the -- corresponding Linker_Options (or Link_With) pragmas appear in the -- source file, so that this order is preserved by the binder in -- constructing the set of linker arguments. -- Note: Linker_Options lines never appear in the ALI file generated for -- a predefined generic unit, and there is cicuitry in Sem_Prag to enforce -- this restriction, which is needed because of not generating source name -- and lib name parameters on the with lines for such files, as explained -- above in the section on with lines. -- -------------- -- -- N Notes -- -- -------------- -- The final section of unit-specific lines contains notes which record -- annotations inserted in source code for processing by external tools -- using pragmas. For each occurrence of any of these pragmas, a line is -- generated with the following syntax: -- N x [:] ... -- x is one of: -- A pragma Annotate -- C pragma Comment -- I pragma Ident -- T pragma Title -- S pragma Subtitle -- is the source location of the pragma in line:col format -- Successive entries record the pragma_argument_associations. -- If a pragma argument identifier is present, the entry is prefixed -- with the pragma argument identifier followed by a colon. -- represents the pragma argument, and has the following -- conventions: -- - identifiers are output verbatim -- - static string expressions are output as literals encoded as -- for L lines -- - static integer expressions are output as decimal literals -- - any other expression is replaced by the placeholder "" --------------------- -- Reference Lines -- --------------------- -- The reference lines contain information about references from any of the -- units in the compilation (including body version and version attributes, -- linker options pragmas and source dependencies). -- ------------------------------------ -- -- E External Version References -- -- ------------------------------------ -- One of these lines is present for each use of 'Body_Version or 'Version -- in any of the units of the compilation. These are used by the linker to -- determine which version symbols must be output. The format is simply: -- E name -- where name is the external name, i.e. the unit name with either a S or a -- B for spec or body version referenced (Body_Version always references -- the body, Version references the Spec, except in the case of a reference -- to a subprogram with no separate spec). Upper half and wide character -- codes are encoded using the same method as in Namet (Uhh for upper half, -- Whhhh for wide character, where hh are hex digits). -- --------------------- -- -- D Dependencies -- -- --------------------- -- The dependency lines indicate the source files on which the compiled -- units depend. This is used by the binder for consistency checking. -- These lines are also referenced by the cross-reference information. -- D source-name time-stamp checksum [subunit-name] line:file-name -- source-name also includes preprocessing data file and preprocessing -- definition file. These preprocessing files may be given as full -- path names instead of simple file names. If a full path name -- includes a directory with spaces, the path name is quoted (quote -- characters (") added at start and end, and any internal quotes are -- doubled). -- The time-stamp field contains the time stamp of the corresponding -- source file. See types.ads for details on time stamp representation. -- The checksum is an 8-hex digit representation of the source file -- checksum, with letters given in lower case. -- The subunit name is present only if the dependency line is for a -- subunit. It contains the fully qualified name of the subunit in all -- lower case letters. -- The line:file-name entry is present only if a Source_Reference -- pragma appeared in the source file identified by source-name. In -- this case, it gives the information from this pragma. Note that this -- allows cross-reference information to be related back to the -- original file. Note: the reason the line number comes first is that -- a leading digit immediately identifies this as a Source_Reference -- entry, rather than a subunit-name. -- A line number of zero for line: in this entry indicates that there -- is more than one source reference pragma. In this case, the line -- numbers in the cross-reference are correct, and refer to the -- original line number, but there is no information that allows a -- reader of the ALI file to determine the exact mapping of physical -- line numbers back to the original source. -- Files with a zero checksum and a non-zero time stamp are in general -- files on which the compilation depends but which are not Ada files -- with further dependencies. This includes preprocessor data files -- and preprocessor definition files. -- Note: blank lines are ignored when the library information is read, -- and separate sections of the file are separated by blank lines to -- ease readability. Blanks between fields are also ignored. -- For entries corresponding to files that were not present (and thus -- resulted in error messages), or for files that are not part of the -- dependency set, both the time stamp and checksum are set to all zero -- characters. These dummy entries are ignored by the binder in -- dependency checking, but must be present for proper interpretation -- of the cross-reference data. -------------------------- -- Cross-Reference Data -- -------------------------- -- The cross-reference data follows the dependency lines. See the spec of -- Lib.Xref in file lib-xref.ads for details on the format of this data. --------------------------------- -- Source Coverage Obligations -- --------------------------------- -- The Source Coverage Obligation (SCO) information follows the cross- -- reference data. See the spec of Par_SCO in file par_sco.ads for full -- details of the format. --------------------------------------- -- SPARK Cross-Reference Information -- --------------------------------------- -- The SPARK cross-reference information follows the SCO information. See -- the spec of SPARK_Xrefs in file spark_xrefs.ads for full details of the -- format. ---------------------- -- Global Variables -- ---------------------- -- The table defined here stores one entry for each Interrupt_State pragma -- encountered either in the main source or in an ancillary with'ed source. -- Since interrupt state values have to be consistent across all units in a -- partition, we detect inconsistencies at compile time when we can. type Interrupt_State_Entry is record Interrupt_Number : Pos; -- Interrupt number value Interrupt_State : Character; -- Set to r/s/u for Runtime/System/User Pragma_Loc : Source_Ptr; -- Location of pragma setting this value in place end record; package Interrupt_States is new Table.Table ( Table_Component_Type => Interrupt_State_Entry, Table_Index_Type => Nat, Table_Low_Bound => 1, Table_Initial => 30, Table_Increment => 200, Table_Name => "Name_Interrupt_States"); -- The table structure defined here stores one entry for each -- Priority_Specific_Dispatching pragma encountered either in the main -- source or in an ancillary with'ed source. Since have to be consistent -- across all units in a partition, we may as well detect inconsistencies -- at compile time when we can. type Specific_Dispatching_Entry is record Dispatching_Policy : Character; -- First character (upper case) of the corresponding policy name First_Priority : Nat; -- Lower bound of the priority range to which the specified dispatching -- policy applies. Last_Priority : Nat; -- Upper bound of the priority range to which the specified dispatching -- policy applies. Pragma_Loc : Source_Ptr; -- Location of pragma setting this value in place end record; package Specific_Dispatching is new Table.Table ( Table_Component_Type => Specific_Dispatching_Entry, Table_Index_Type => Nat, Table_Low_Bound => 1, Table_Initial => 10, Table_Increment => 100, Table_Name => "Name_Priority_Specific_Dispatching"); ----------------- -- Subprograms -- ----------------- procedure Ensure_System_Dependency; -- This procedure ensures that a dependency is created on system.ads. Even -- if there is no semantic dependency, Targparm has read the file to -- acquire target parameters, so we need a source dependency. procedure Write_ALI (Object : Boolean); -- This procedure writes the library information for the current main unit -- The Object parameter is true if an object file is created, and false -- otherwise. -- -- Note: in the case where we are not generating code (-gnatc mode), this -- routine only writes an ALI file if it cannot find an existing up to -- date ALI file. If it *can* find an existing up to date ALI file, then -- it reads this file and sets the Lib.Compilation_Arguments table from -- the A lines in this file. procedure Add_Preprocessing_Dependency (S : Source_File_Index); -- Indicate that there is a dependency to be added on a preprocessing data -- file or on a preprocessing definition file. end Lib.Writ;