------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- D E B U G --
-- --
-- B o d y --
-- --
-- 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- . --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
package body Debug is
---------------------------------
-- Summary of Debug Flag Usage --
---------------------------------
-- Debug flags for compiler (GNAT1)
-- da Generate messages tracking semantic analyzer progress
-- db Show encoding of type names for debug output
-- dc List names of units as they are compiled
-- dd Dynamic allocation of tables messages generated
-- de List the entity table
-- df Full tree/source print (includes withed units)
-- dg Print source from tree (generated code only)
-- dh Generate listing showing loading of name table hash chains
-- di Generate messages for visibility linking/delinking
-- dj Suppress "junk null check" for access parameter values
-- dk Generate GNATBUG message on abort, even if previous errors
-- dl Generate unit load trace messages
-- dm Allow VMS features even if not OpenVMS version
-- dn Generate messages for node/list allocation
-- do Print source from tree (original code only)
-- dp Generate messages for parser scope stack push/pops
-- dq No auto-alignment of small records
-- dr Generate parser resynchronization messages
-- ds Print source from tree (including original and generated stuff)
-- dt Print full tree
-- du Uncheck categorization pragmas
-- dv Output trace of overload resolution
-- dw Print trace of semantic scope stack
-- dx Force expansion on, even if no code being generated
-- dy Print tree of package Standard
-- dz Print source of package Standard
-- dA All entities included in representation information output
-- dB Output debug encoding of type names and variants
-- dC Output debugging information on check suppression
-- dD Delete elaboration checks in inner level routines
-- dE Apply elaboration checks to predefined units
-- dF Front end data layout enabled
-- dG Generate all warnings including those normally suppressed
-- dH Hold (kill) call to gigi
-- dI Inhibit internal name numbering in gnatG listing
-- dJ Output debugging trace info for JGNAT (Java VM version of GNAT)
-- dK Kill all error messages
-- dL Output trace information on elaboration checking
-- dM Assume all variables are modified (no current values)
-- dN No file name information in exception messages
-- dO Output immediate error messages
-- dP Do not check for controlled objects in preelaborable packages
-- dQ Do not generate runtime check for duplicated external tag
-- dR Bypass check for correct version of s-rpc
-- dS Never convert numbers to machine numbers in Sem_Eval
-- dT Convert to machine numbers only for constant declarations
-- dU Enable garbage collection of unreachable entities
-- dV Enable viewing of all symbols in debugger
-- dW Disable warnings on calls for IN OUT parameters
-- dX Display messages on reads of potentially uninitialized scalars
-- dY Enable configurable run-time mode
-- dZ Generate listing showing the contents of the dispatch tables
-- d.a Force Target_Strict_Alignment mode to True
-- d.b Dump backend types
-- d.c Generate inline concatenation, do not call procedure
-- d.d Disable atomic synchronization
-- d.e Enable atomic synchronization
-- d.f Inhibit folding of static expressions
-- d.g Enable conversion of raise into goto
-- d.h
-- d.i Ignore Warnings pragmas
-- d.j Generate listing of frontend inlined calls
-- d.k Enable new support for frontend inlining
-- d.l Use Ada 95 semantics for limited function returns
-- d.m For -gnatl, print full source only for main unit
-- d.n Print source file names
-- d.o Generate .NET listing of CIL code
-- d.p Enable the .NET CIL verifier
-- d.q
-- d.r Enable OK_To_Reorder_Components in non-variant records
-- d.s Disable expansion of slice move, use memmove
-- d.t Disable static allocation of library level dispatch tables
-- d.u
-- d.v Enable OK_To_Reorder_Components in variant records
-- d.w Do not check for infinite loops
-- d.x No exception handlers
-- d.y
-- d.z
-- d.A Read/write Aspect_Specifications hash table to tree
-- d.B
-- d.C Generate concatenation call, do not generate inline code
-- d.D SPARK strict mode
-- d.E Force SPARK mode for gnat2why
-- d.F SPARK mode
-- d.G Frame condition mode for gnat2why
-- d.H Standard package only mode for gnat2why
-- d.I Do not ignore enum representation clauses in CodePeer mode
-- d.J Disable parallel SCIL generation mode
-- d.K SPARK detection only mode for gnat2why
-- d.L Depend on back end for limited types in if and case expressions
-- d.M Relaxed RM semantics
-- d.N Add node to all entities
-- d.O Dump internal SCO tables
-- d.P Previous (non-optimized) handling of length comparisons
-- d.Q Flow Analysis mode for gnat2why
-- d.R Restrictions in ali files in positional form
-- d.S Force Optimize_Alignment (Space)
-- d.T Force Optimize_Alignment (Time)
-- d.U Ignore indirect calls for static elaboration
-- d.V Extensions for formal verification
-- d.W Print out debugging information for Walk_Library_Items
-- d.X Use Expression_With_Actions
-- d.Y Do not use Expression_With_Actions
-- d.Z Dump flow analysis graphs, for debugging purposes (gnat2why)
-- d1 Error msgs have node numbers where possible
-- d2 Eliminate error flags in verbose form error messages
-- d3 Dump bad node in Comperr on an abort
-- d4 Inhibit automatic krunch of predefined library unit files
-- d5 Debug output for tree read/write
-- d6 Default access unconstrained to thin pointers
-- d7 Do not output version & file time stamp in -gnatv or -gnatl mode
-- d8 Force opposite endianness in packed stuff
-- d9 Allow lock free implementation
-- Debug flags for binder (GNATBIND)
-- da All links (including internal units) listed if there is a cycle
-- db Output information from Better_Choice
-- dc List units as they are chosen
-- dd
-- de Elaboration dependencies including system units
-- df
-- dg
-- dh
-- di Ignore_Errors mode for reading ali files
-- dj
-- dk
-- dl
-- dm
-- dn List details of manipulation of Num_Pred values
-- do Use old preference for elaboration order
-- dp
-- dq
-- dr
-- ds
-- dt
-- du List units as they are acquired
-- dv
-- dw
-- dx Force binder to read xref information from ali files
-- dy
-- dz
-- Debug flags used in package Make and its clients (e.g. GNATMAKE)
-- da
-- db
-- dc
-- dd
-- de
-- df Only output file names, not path names, in log
-- dg
-- dh Generate listing showing loading of name table hash chains
-- di
-- dj
-- dk
-- dl
-- dm Display the number of maximum simultaneous compilations
-- dn Do not delete temp files created by gnatmake
-- do
-- dp Prints the contents of the Q used by Make.Compile_Sources
-- dq Prints source files as they are enqueued and dequeued
-- dr
-- ds
-- dt Display time stamps when there is a mismatch
-- du List units as their ali files are acquired
-- dv
-- dw Prints the list of units withed by the unit currently explored
-- dx
-- dy
-- dz
--------------------------------------------
-- Documentation for Compiler Debug Flags --
--------------------------------------------
-- da Generate messages tracking semantic analyzer progress. A message
-- is output showing each node as it gets analyzed, expanded,
-- resolved, or evaluated. This option is useful for finding out
-- exactly where a bomb during semantic analysis is occurring.
-- db In Exp_Dbug, certain type names are encoded to include debugging
-- information. This debug switch causes lines to be output showing
-- the encodings used.
-- dc List names of units as they are compiled. One line of output will
-- be generated at the start of compiling each unit (package or
-- subprogram).
-- dd Dynamic allocation of tables messages generated. Each time a
-- table is reallocated, a line is output indicating the expansion.
-- de List the entity table
-- df Full tree/source print (includes withed units). Normally the tree
-- output (dt) or recreated source output (dg,do,ds) includes only
-- the main unit. If df is set, then the output in either case
-- includes all compiled units (see also dg,do,ds,dt). Note that to
-- be effective, this swich must be used in combination with one or
-- more of dt, dg, do or ds.
-- dg Print the source recreated from the generated tree. In the case
-- where the tree has been rewritten this output includes only the
-- generated code, not the original code (see also df,do,ds,dz).
-- This flag differs from -gnatG in that the output also includes
-- non-source generated null statements, and freeze nodes, which
-- are normally omitted in -gnatG mode.
-- dh Generates a table at the end of a compilation showing how the hash
-- table chains built by the Namet package are loaded. This is useful
-- in ensuring that the hashing algorithm (in Namet.Hash) is working
-- effectively with typical sets of program identifiers.
-- di Generate messages for visibility linking/delinking
-- dj Suppress "junk null check" for access parameters. This flag permits
-- Ada programs to pass null parameters to access parameters, and to
-- explicitly check such access values against the null literal.
-- Neither of these is valid Ada, but both were allowed in versions of
-- GNAT before 3.10, so this switch can ease the transition process.
-- dk Immediate kill on abort. Normally on an abort (i.e. a call to
-- Comperr.Compiler_Abort), the GNATBUG message is not given if
-- there is a previous error. This debug switch bypasses this test
-- and gives the message unconditionally (useful for debugging).
-- dl Generate unit load trace messages. A line of traceback output is
-- generated each time a request is made to the library manager to
-- load a new unit.
-- dm Some features are permitted only in OpenVMS ports of GNAT (e.g.
-- the specification of passing by descriptor). Normally any use
-- of these features will be flagged as an error, but this debug
-- flag allows acceptance of these features in non OpenVMS ports.
-- Of course they may not have any useful effect, and in particular
-- attempting to generate code with this flag set may blow up.
-- The flag also forces the use of 64-bits for Long_Integer.
-- dn Generate messages for node/list allocation. Each time a node or
-- list header is allocated, a line of output is generated. Certain
-- other basic tree operations also cause a line of output to be
-- generated. This option is useful in seeing where the parser is
-- blowing up.
-- do Print the source recreated from the generated tree. In the case
-- where the tree has been rewritten, this output includes only the
-- original code, not the generated code (see also df,dg,ds,dz).
-- dp Generate messages for parser scope stack push/pops. A line of
-- output by the parser each time the parser scope stack is either
-- pushed or popped. Useful in debugging situations where the
-- parser scope stack ends up incorrectly synchronized
-- dq In layout version 1.38, 2002/01/12, a circuit was implemented
-- to give decent default alignment to short records that had no
-- specific alignment set. This debug option restores the previous
-- behavior of giving such records poor alignments, typically 1.
-- This may be useful in dealing with transition.
-- dr Generate parser resynchronization messages. Normally the parser
-- resynchronizes quietly. With this debug option, two messages
-- are generated, one when the parser starts a resynchronization
-- skip, and another when it resumes parsing. Useful in debugging
-- inadequate error recovery situations.
-- ds Print the source recreated from the generated tree. In the case
-- where the tree has been rewritten this output includes both the
-- generated code and the original code with the generated code
-- being enlosed in curly brackets (see also df,do,ds,dz)
-- dt Print full tree. The generated tree is output (see also df,dy)
-- du Uncheck categorization pragmas. This debug switch causes the
-- categorization pragmas (Pure, Preelaborate etc) to be ignored
-- so that normal checks are not made (this is particularly useful
-- for adding temporary debugging code to units that have pragmas
-- that are inconsistent with the debugging code added.
-- dv Output trace of overload resolution. Outputs messages for
-- overload attempts that involve cascaded errors, or where
-- an interepretation is incompatible with the context.
-- dw Write semantic scope stack messages. Each time a scope is created
-- or removed, a message is output (see the Sem_Ch8.Push_Scope and
-- Sem_Ch8.Pop_Scope subprograms).
-- dx Force expansion on, even if no code being generated. Normally the
-- expander is inhibited if no code is generated. This switch forces
-- expansion to proceed normally even if the backend is not being
-- called. This is particularly useful for debugging purposes when
-- using the front-end only version of the compiler (which normally
-- would never do any expansion).
-- dy Print tree of package Standard. Normally the tree print out does
-- not include package Standard, even if the -df switch is set. This
-- switch forces output of the internal tree built for Standard.
-- dz Print source of package Standard. Normally the source print out
-- does not include package Standard, even if the -df switch is set.
-- This switch forces output of the source recreated from the internal
-- tree built for Standard. Note that this differs from -gnatS in
-- that it prints from the actual tree using the normal Sprint
-- circuitry for printing trees.
-- dA Forces output of representation information, including full
-- information for all internal type and object entities, as well
-- as all user defined type and object entities including private
-- and incomplete types. This debug switch also automatically sets
-- the equivalent of -gnatR3m.
-- dB Output debug encodings for types and variants. See Exp_Dbug for
-- exact form of the generated output.
-- dC Output trace information showing the decisions made during
-- check suppression activity in unit Checks.
-- dD Delete new elaboration checks. This flag causes GNAT to return
-- to the 3.13a elaboration semantics, and to suppress the fixing
-- of two bugs. The first is in the context of inner routines in
-- dynamic elaboration mode, when the subprogram we are in was
-- called at elaboration time by a unit that was also compiled with
-- dynamic elaboration checks. In this case, if A calls B calls C,
-- and all are in different units, we need an elaboration check at
-- each call. These nested checks were only put in recently (see
-- version 1.80 of Sem_Elab) and we provide this debug flag to
-- revert to the previous behavior in case of regressions. The
-- other behavior reverted by this flag is the treatment of the
-- Elaborate_Body pragma in static elaboration mode. This used to
-- be treated as not needing elaboration checking, but in fact in
-- general Elaborate_All is still required because of nested calls.
-- dE Apply compile time elaboration checking for with relations between
-- predefined units. Normally no checks are made (it seems that at
-- least on the SGI, such checks run into trouble).
-- dF Front end data layout enabled. Normally front end data layout
-- is only enabled if the target parameter Backend_Layout is False.
-- This debugging switch enables it unconditionally.
-- dG Generate all warnings. Normally Errout suppresses warnings on
-- units that are not part of the main extended source, and also
-- suppresses warnings on instantiations in the main extended
-- source that duplicate warnings already posted on the template.
-- This switch stops both kinds of deletion and causes Errout to
-- post all warnings sent to it.
-- dH Inhibit call to gigi. This is useful for testing front end data
-- layout, and may be useful in other debugging situations where
-- you do not want gigi to intefere with the testing.
-- dI Inhibit internal name numbering in gnatDG listing. Any sequence of
-- the form appearing in
-- a name is replaced by .... This
-- is used in the fixed bugs run to minimize system and version
-- dependency in filed -gnatD or -gnatG output.
-- dJ Generate debugging trace output for the JGNAT back end. This
-- consists of symbolic Java Byte Code sequences for all generated
-- classes plus additional information to indicate local variables
-- and methods.
-- dK Kill all error messages. This debug flag suppresses the output
-- of all error messages. It is used in regression tests where the
-- error messages are target dependent and irrelevant.
-- dL Output trace information on elaboration checking. This debug
-- switch causes output to be generated showing each call or
-- instantiation as it is checked, and the progress of the recursive
-- trace through calls at elaboration time.
-- dM Assume all variables have been modified, and ignore current value
-- indications. This debug flag disconnects the tracking of constant
-- values (see Exp_Ch2.Expand_Current_Value).
-- dN Do not generate file name information in exception messages
-- dO Output immediate error messages. This causes error messages to
-- be output as soon as they are generated (disconnecting several
-- circuits for improvement of messages, deletion of duplicate
-- messages etc). Useful to diagnose compiler bombs caused by
-- erroneous handling of error situations
-- dP Do not check for controlled objects in preelaborable packages.
-- RM 10.2.1(9) forbids the use of library level controlled objects
-- in preelaborable packages, but this restriction is a huge pain,
-- especially in the predefined library units.
-- dQ Eliminate check for duplicate external tags. This check was added
-- as per AI 0113, and causes some backward compatibility problems.
-- It is never legitimate to have duplicate external tags, so the
-- check is certainly valid, but this debug switch can be useful for
-- enabling previous behavior of ignoring this problem.
-- dR Bypass the check for a proper version of s-rpc being present
-- to use the -gnatz? switch. This allows debugging of the use
-- of stubs generation without needing to have GLADE (or some
-- other PCS installed).
-- dS Omit conversion of fpt numbers to exact machine numbers in
-- non-static evaluation contexts (see Check_Non_Static_Context).
-- This is intended for testing out timing problems with this
-- conversion circuit.
-- dT Similar to dS, but omits the conversions only in the case where
-- the parent is not a constant declaration.
-- dU Enable garbage collection of unreachable entities. This enables
-- both the reachability analysis and changing the Is_Public and
-- Is_Eliminated flags.
-- dV Enable viewing of all symbols in debugger. Causes debug information
-- to be generated for all symbols, including internal symbols. This
-- is enabled by default for -gnatD, but this switch allows this to
-- be enabled without generating modified source files. Note that the
-- use of -gnatdV ensures in the dwarf/elf case that all symbols that
-- are present in the elf tables are also in the dwarf tables (which
-- seems to be required by some tools). Another effect of dV is to
-- generate full qualified names, including internal names generated
-- for blocks and loops.
-- dW Disable warnings when a possibly uninitialized scalar value is
-- passed to an IN OUT parameter of a procedure. This usage is a
-- quite improper bounded error [erroneous in Ada 83] situation,
-- and would normally generate a warning. However, to ease the
-- task of transitioning incorrect legacy code, we provide this
-- undocumented feature for suppressing these warnings.
-- dY Enable configurable run-time mode, just as though the System file
-- had Configurable_Run_Time_Mode set to True. This is useful in
-- testing high integrity mode.
-- dZ Generate listing showing the contents of the dispatch tables. Each
-- line has an internally generated number used for references between
-- tagged types and primitives. For each primitive the output has the
-- following fields:
--
-- - Letter 'P' or letter 's': The former indicates that this
-- primitive will be located in a primary dispatch table. The
-- latter indicates that it will be located in a secondary
-- dispatch table.
--
-- - Name of the primitive. In case of predefined Ada primitives
-- the text "(predefined)" is added before the name, and these
-- acronyms are used: SR (Stream_Read), SW (Stream_Write), SI
-- (Stream_Input), SO (Stream_Output), DA (Deep_Adjust), DF
-- (Deep_Finalize). In addition Oeq identifies the equality
-- operator, and "_assign" the assignment.
--
-- - If the primitive covers interface types, two extra fields
-- referencing other primitives are generated: "Alias" references
-- the primitive of the tagged type that covers an interface
-- primitive, and "AI_Alias" references the covered interface
-- primitive.
--
-- - The expression "at #xx" indicates the slot of the dispatch
-- table occupied by such primitive in its corresponding primary
-- or secondary dispatch table.
--
-- - In case of abstract subprograms the text "is abstract" is
-- added at the end of the line.
-- d.a Force Target_Strict_Alignment to True, even on targets where it
-- would normally be false. Can be used for testing strict alignment
-- circuitry in the compiler.
-- d.b Dump back end types. During Create_Standard, the back end is
-- queried for all available types. This option shows them.
-- d.c Generate inline concatenation, instead of calling one of the
-- System.Concat_n.Str_Concat_n routines in cases where the latter
-- routines would normally be called.
-- d.d Disable atomic synchronization for all atomic variable references.
-- Pragma Enable_Atomic_Synchronization is ignored.
-- d.e Enable atomic synchronization for all atomic variable references.
-- Pragma Disable_Atomic_Synchronization is ignored, and also the
-- compiler switch -gnated is ignored.
-- d.f Suppress folding of static expressions. This of course results
-- in seriously non-conforming behavior, but is useful sometimes
-- when tracking down handling of complex expressions.
-- d.g Enables conversion of a raise statement into a goto when the
-- relevant handler is statically determinable. For now we only try
-- this if this debug flag is set. Later we will enable this more
-- generally by default.
-- d.i Ignore all occurrences of pragma Warnings in the sources. This can
-- be used in particular to disable Warnings (Off) to check if any of
-- these statements are inappropriate.
-- d.j Generate listing of frontend inlined calls and inline calls passed
-- to the backend. This is useful to locate skipped calls that must be
-- inlined by the frontend.
-- d.k Enable new semantics of frontend inlining. This is useful to test
-- this new feature in all the platforms.
-- d.l Use Ada 95 semantics for limited function returns. This may be
-- used to work around the incompatibility introduced by AI-318-2.
-- It is useful only in -gnat05 mode.
-- d.m When -gnatl is used, the normal output includes full listings of
-- all files in the extended main source (body/spec/subunits). If this
-- debug switch is used, then the full listing is given only for the
-- main source (this corresponds to a previous behavior of -gnatl and
-- is used for running the ACATS tests).
-- d.n Print source file names as they are loaded. This is useful if the
-- compiler has a bug -- these are the files that need to be included
-- in a bug report.
-- d.o Generate listing showing the IL instructions generated by the .NET
-- compiler for each subprogram.
-- d.p Enable the .NET CIL verifier. During development the verifier is
-- disabled by default and this flag is used to enable it. In the
-- future we will reverse this functionality.
-- d.r Forces the flag OK_To_Reorder_Components to be set in all record
-- base types that have no discriminants.
-- d.s Normally the compiler expands slice moves into loops if overlap
-- might be possible. This debug flag inhibits that expansion, and
-- the back end is expected to use an appropriate routine to handle
-- overlap, based on Forward_OK and Backwards_OK flags.
-- d.t The compiler has been modified (a fairly extensive modification)
-- to generate static dispatch tables for library level tagged types.
-- This debug switch disables this modification and reverts to the
-- previous dynamic construction of tables. It is there as a possible
-- work around if we run into trouble with the new implementation.
-- d.v Forces the flag OK_To_Reorder_Components to be set in all record
-- base types that have at least one discriminant (v = variant).
-- d.w This flag turns off the scanning of loops to detect possible
-- infinite loops.
-- d.A There seems to be a problem with ASIS if we activate the circuit
-- for reading and writing the aspect specification hash table, so
-- for now, this is controlled by the debug flag d.A. The hash table
-- is only written and read if this flag is set.
-- d.x No exception handlers in generated code. This causes exception
-- handlers to be eliminated from the generated code. They are still
-- fully compiled and analyzed, they just get eliminated from the
-- code generation step.
-- d.C Generate call to System.Concat_n.Str_Concat_n routines in cases
-- where we would normally generate inline concatenation code.
-- d.D SPARK strict mode. Interpret compiler permissions as strictly as
-- possible in SPARK mode.
-- d.E Force SPARK mode for gnat2why. In this mode, errors are issued for
-- all violations of SPARK in user code, and warnings are issued for
-- constructs not yet implemented in gnat2why.
-- d.F SPARK mode. Generate AST in a form suitable for formal
-- verification, as well as additional cross reference information in
-- ALI files to compute effects of subprograms. Note that ALI files
-- are only written when option d.G is also given.
-- d.G Frame condition mode for gnat2why. In this mode, gnat2why will not
-- generate Why code. Instead, it generates ALI files with an extra
-- section which contains the effects of subprograms.
-- d.H Standard package only mode for gnat2why. In this mode, gnat2why
-- will only generate Why code for package Standard. Any given input
-- file will be ignored.
-- d.I Do not ignore enum representation clauses in CodePeer mode.
-- The default of ignoring representation clauses for enumeration
-- types in CodePeer is good for the majority of Ada code, but in some
-- cases being able to change this default might be useful to remove
-- some false positives.
-- d.J Disable parallel SCIL generation. Normally SCIL file generation is
-- done in parallel to speed processing. This switch disables this
-- behavior.
-- d.K SPARK detection only mode for gnat2why. In this mode, gnat2why
-- does not generate Why code.
-- d.L Normally the front end generates special expansion for conditional
-- expressions of a limited type. This debug flag removes this special
-- case expansion, leaving it up to the back end to handle conditional
-- expressions correctly.
-- d.M Relaxed RM semantics. This flag sets Opt.Relaxed_RM_Semantics
-- See Opt.Relaxed_RM_Semantics for more details.
-- d.N Enlarge entities by one node (but don't attempt to use this extra
-- node for storage of any flags or fields). This can be used to do
-- experiments on the impact of increasing entity sizes.
-- d.O Dump internal SCO tables. Before outputting the SCO information to
-- the ALI file, the internal SCO tables (SCO_Table/SCO_Unit_Table)
-- are dumped for debugging purposes.
-- d.P Previous non-optimized handling of length comparisons. Setting this
-- flag inhibits the effect of Optimize_Length_Comparison in Exp_Ch4.
-- This is there in case we find a situation where the optimization
-- malfunctions, to provide a work around.
-- d.Q Flow Analysis mode for gnat2why. When this flag is given,
-- gnat2why will do flow analysis, and no translation to Why is done.
-- d.R As documented in lib-writ.ads, restrictions in the ali file can
-- have two forms, positional and named. The named notation is the
-- current preferred form, but the use of this debug switch will force
-- the use of the obsolescent positional form.
-- d.S Force Optimize_Alignment (Space) mode as the default
-- d.T Force Optimize_Alignment (Time) mode as the default
-- d.U Ignore indirect calls for static elaboration. The static
-- elaboration model is conservative, especially regarding indirect
-- calls. If you say Proc'Access, it will assume you might call
-- Proc. This can cause elaboration cycles at bind time. This flag
-- reverts to the behavior of earlier compilers, which ignored
-- indirect calls.
-- d.V Extensions for formal verification. New attributes/aspects/pragmas
-- defined in GNAT for formal verification with the tool GNATprove are
-- only accepted under this switch.
-- d.W Print out debugging information for Walk_Library_Items, including
-- the order in which units are walked. This is primarily for use in
-- debugging CodePeer mode.
-- d.X By default, the compiler uses an elaborate rewriting framework for
-- short-circuited forms where the right hand condition generates
-- actions to be inserted. With the gcc backend, we now use the new
-- N_Expression_With_Actions node for this expansion, but we still use
-- the old method for other backends and in SCIL mode. This debug flag
-- forces use of the new N_Expression_With_Actions node in these other
-- cases and is intended for transitional use.
-- d.Z In gnat2why, in Flow analysis mode (-gnatd.Q), dump the different
-- graphs (control flow, control dependence) for debugging purposes.
-- This debug flag will be removed when flow analysis is sufficiently
-- stable.
-- d.Y Prevents the use of the N_Expression_With_Actions node even in the
-- case of the gcc back end. Provided as a back up in case the new
-- scheme has problems.
-- d1 Error messages have node numbers where possible. Normally error
-- messages have only source locations. This option is useful when
-- debugging errors caused by expanded code, where the source location
-- does not give enough information.
-- d2 Suppress output of the error position flags for verbose form error
-- messages. The messages are still interspersed in the listing, but
-- without any error flags or extra blank lines. Also causes an extra
-- <<< to be output at the right margin. This is intended to be the
-- easiest format for checking conformance of ACATS B tests. This
-- flag also suppresses the additional messages explaining why a
-- non-static expression is non-static (see Sem_Eval.Why_Not_Static).
-- This avoids having to worry about these messages in ACATS testing.
-- d3 Causes Comperr to dump the contents of the node for which an abort
-- was detected (normally only the Node_Id of the node is output).
-- d4 Inhibits automatic krunching of predefined library unit file names.
-- Normally, as described in the spec of package Krunch, such files
-- are automatically krunched to 8 characters, with special treatment
-- of the prefixes Ada, System, and Interfaces. Setting this debug
-- switch disables this special treatment.
-- d5 Causes the tree read/write circuit to output detailed information
-- tracking the data that is read and written element by element.
-- d6 Normally access-to-unconstrained-array types are represented
-- using fat (double) pointers. Using this debug flag causes them
-- to default to thin. This can be used to test the performance
-- implications of using thin pointers, and also to test that the
-- compiler functions correctly with this choice.
-- d7 Normally a -gnatl or -gnatv listing includes the time stamp
-- of the source file. This debug flag suppresses this output,
-- and also suppresses the message with the version number.
-- This is useful in certain regression tests.
-- d8 This forces the packed stuff to generate code assuming the
-- opposite endianness from the actual correct value. Useful in
-- testing out code generation from the packed routines.
-- d9 This allows lock free implementation for protected objects
-- (see Exp_Ch9).
------------------------------------------
-- Documentation for Binder Debug Flags --
------------------------------------------
-- da Normally if there is an elaboration circularity, then in describing
-- the cycle, links involving internal units are omitted, since they
-- are irrelevant and confusing. This debug flag causes all links to
-- be listed, and is useful when diagnosing circularities introduced
-- by incorrect changes to the run-time library itself.
-- db Output debug information from Better_Choice in Binde, which uses
-- various heuristics to determine elaboration order in cases where
-- multiple orders are valid.
-- dc List units as they are chosen. As units are selected for addition to
-- the elaboration order, a line of output is generated showing which
-- unit has been selected.
-- de Similar to the effect of -e (output complete list of elaboration
-- dependencies) except that internal units are included in the
-- listing.
-- di Normally gnatbind calls Read_Ali with Ignore_Errors set to
-- False, since the binder really needs correct version ALI
-- files to do its job. This debug flag causes Ignore_Errors
-- mode to be set for the binder (and is particularly useful
-- for testing ignore errors mode).
-- dn List details of manipulation of Num_Pred values during execution of
-- the algorithm used to determine a correct order of elaboration. This
-- is useful in diagnosing any problems in its behavior.
-- do Use old elaboration order preference. The new preference rules
-- prefer specs with no bodies to specs with bodies, and between two
-- specs with bodies, prefers the one whose body is closer to being
-- able to be elaborated. This is a clear improvement, but we provide
-- this debug flag in case of regressions.
-- du List unit name and file name for each unit as it is read in
-- dx Force the binder to read (and then ignore) the xref information
-- in ali files (used to check that read circuit is working OK).
--------------------------------------------
-- Documentation for gnatmake Debug Flags --
--------------------------------------------
-- df Only output file names, not path names, in log
-- dh Generate listing showing loading of name table hash chains,
-- same as for the compiler.
-- dm Issue a message indicating the maximum number of simultaneous
-- compilations.
-- dn Do not delete temporary files created by gnatmake at the end
-- of execution, such as temporary config pragma files, mapping
-- files or project path files.
-- dp Prints the Q used by routine Make.Compile_Sources every time
-- we go around the main compile loop of Make.Compile_Sources
-- dq Prints source files as they are enqueued and dequeued in the Q
-- used by routine Make.Compile_Sources. Useful to figure out the
-- order in which sources are recompiled.
-- dt When a time stamp mismatch has been found for an ALI file,
-- display the source file name, the time stamp expected and
-- the time stamp found.
-- du List unit name and file name for each unit as it is read in
-- dw Prints the list of units withed by the unit currently explored
-- during the main loop of Make.Compile_Sources.
---------------------------------------------
-- Documentation for gprbuild Debug Flags --
---------------------------------------------
-- dn Do not delete temporary files createed by gprbuild at the end
-- of execution, such as temporary config pragma files, mapping
-- files or project path files.
-- dt When a time stamp mismatch has been found for an ALI file,
-- display the source file name, the time stamp expected and
-- the time stamp found.
--------------------
-- Set_Debug_Flag --
--------------------
procedure Set_Debug_Flag (C : Character; Val : Boolean := True) is
subtype Dig is Character range '1' .. '9';
subtype LLet is Character range 'a' .. 'z';
subtype ULet is Character range 'A' .. 'Z';
begin
if C in Dig then
case Dig (C) is
when '1' => Debug_Flag_1 := Val;
when '2' => Debug_Flag_2 := Val;
when '3' => Debug_Flag_3 := Val;
when '4' => Debug_Flag_4 := Val;
when '5' => Debug_Flag_5 := Val;
when '6' => Debug_Flag_6 := Val;
when '7' => Debug_Flag_7 := Val;
when '8' => Debug_Flag_8 := Val;
when '9' => Debug_Flag_9 := Val;
end case;
elsif C in ULet then
case ULet (C) is
when 'A' => Debug_Flag_AA := Val;
when 'B' => Debug_Flag_BB := Val;
when 'C' => Debug_Flag_CC := Val;
when 'D' => Debug_Flag_DD := Val;
when 'E' => Debug_Flag_EE := Val;
when 'F' => Debug_Flag_FF := Val;
when 'G' => Debug_Flag_GG := Val;
when 'H' => Debug_Flag_HH := Val;
when 'I' => Debug_Flag_II := Val;
when 'J' => Debug_Flag_JJ := Val;
when 'K' => Debug_Flag_KK := Val;
when 'L' => Debug_Flag_LL := Val;
when 'M' => Debug_Flag_MM := Val;
when 'N' => Debug_Flag_NN := Val;
when 'O' => Debug_Flag_OO := Val;
when 'P' => Debug_Flag_PP := Val;
when 'Q' => Debug_Flag_QQ := Val;
when 'R' => Debug_Flag_RR := Val;
when 'S' => Debug_Flag_SS := Val;
when 'T' => Debug_Flag_TT := Val;
when 'U' => Debug_Flag_UU := Val;
when 'V' => Debug_Flag_VV := Val;
when 'W' => Debug_Flag_WW := Val;
when 'X' => Debug_Flag_XX := Val;
when 'Y' => Debug_Flag_YY := Val;
when 'Z' => Debug_Flag_ZZ := Val;
end case;
else
case LLet (C) is
when 'a' => Debug_Flag_A := Val;
when 'b' => Debug_Flag_B := Val;
when 'c' => Debug_Flag_C := Val;
when 'd' => Debug_Flag_D := Val;
when 'e' => Debug_Flag_E := Val;
when 'f' => Debug_Flag_F := Val;
when 'g' => Debug_Flag_G := Val;
when 'h' => Debug_Flag_H := Val;
when 'i' => Debug_Flag_I := Val;
when 'j' => Debug_Flag_J := Val;
when 'k' => Debug_Flag_K := Val;
when 'l' => Debug_Flag_L := Val;
when 'm' => Debug_Flag_M := Val;
when 'n' => Debug_Flag_N := Val;
when 'o' => Debug_Flag_O := Val;
when 'p' => Debug_Flag_P := Val;
when 'q' => Debug_Flag_Q := Val;
when 'r' => Debug_Flag_R := Val;
when 's' => Debug_Flag_S := Val;
when 't' => Debug_Flag_T := Val;
when 'u' => Debug_Flag_U := Val;
when 'v' => Debug_Flag_V := Val;
when 'w' => Debug_Flag_W := Val;
when 'x' => Debug_Flag_X := Val;
when 'y' => Debug_Flag_Y := Val;
when 'z' => Debug_Flag_Z := Val;
end case;
end if;
end Set_Debug_Flag;
---------------------------
-- Set_Dotted_Debug_Flag --
---------------------------
procedure Set_Dotted_Debug_Flag (C : Character; Val : Boolean := True) is
subtype Dig is Character range '1' .. '9';
subtype LLet is Character range 'a' .. 'z';
subtype ULet is Character range 'A' .. 'Z';
begin
if C in Dig then
case Dig (C) is
when '1' => Debug_Flag_Dot_1 := Val;
when '2' => Debug_Flag_Dot_2 := Val;
when '3' => Debug_Flag_Dot_3 := Val;
when '4' => Debug_Flag_Dot_4 := Val;
when '5' => Debug_Flag_Dot_5 := Val;
when '6' => Debug_Flag_Dot_6 := Val;
when '7' => Debug_Flag_Dot_7 := Val;
when '8' => Debug_Flag_Dot_8 := Val;
when '9' => Debug_Flag_Dot_9 := Val;
end case;
elsif C in ULet then
case ULet (C) is
when 'A' => Debug_Flag_Dot_AA := Val;
when 'B' => Debug_Flag_Dot_BB := Val;
when 'C' => Debug_Flag_Dot_CC := Val;
when 'D' => Debug_Flag_Dot_DD := Val;
when 'E' => Debug_Flag_Dot_EE := Val;
when 'F' => Debug_Flag_Dot_FF := Val;
when 'G' => Debug_Flag_Dot_GG := Val;
when 'H' => Debug_Flag_Dot_HH := Val;
when 'I' => Debug_Flag_Dot_II := Val;
when 'J' => Debug_Flag_Dot_JJ := Val;
when 'K' => Debug_Flag_Dot_KK := Val;
when 'L' => Debug_Flag_Dot_LL := Val;
when 'M' => Debug_Flag_Dot_MM := Val;
when 'N' => Debug_Flag_Dot_NN := Val;
when 'O' => Debug_Flag_Dot_OO := Val;
when 'P' => Debug_Flag_Dot_PP := Val;
when 'Q' => Debug_Flag_Dot_QQ := Val;
when 'R' => Debug_Flag_Dot_RR := Val;
when 'S' => Debug_Flag_Dot_SS := Val;
when 'T' => Debug_Flag_Dot_TT := Val;
when 'U' => Debug_Flag_Dot_UU := Val;
when 'V' => Debug_Flag_Dot_VV := Val;
when 'W' => Debug_Flag_Dot_WW := Val;
when 'X' => Debug_Flag_Dot_XX := Val;
when 'Y' => Debug_Flag_Dot_YY := Val;
when 'Z' => Debug_Flag_Dot_ZZ := Val;
end case;
else
case LLet (C) is
when 'a' => Debug_Flag_Dot_A := Val;
when 'b' => Debug_Flag_Dot_B := Val;
when 'c' => Debug_Flag_Dot_C := Val;
when 'd' => Debug_Flag_Dot_D := Val;
when 'e' => Debug_Flag_Dot_E := Val;
when 'f' => Debug_Flag_Dot_F := Val;
when 'g' => Debug_Flag_Dot_G := Val;
when 'h' => Debug_Flag_Dot_H := Val;
when 'i' => Debug_Flag_Dot_I := Val;
when 'j' => Debug_Flag_Dot_J := Val;
when 'k' => Debug_Flag_Dot_K := Val;
when 'l' => Debug_Flag_Dot_L := Val;
when 'm' => Debug_Flag_Dot_M := Val;
when 'n' => Debug_Flag_Dot_N := Val;
when 'o' => Debug_Flag_Dot_O := Val;
when 'p' => Debug_Flag_Dot_P := Val;
when 'q' => Debug_Flag_Dot_Q := Val;
when 'r' => Debug_Flag_Dot_R := Val;
when 's' => Debug_Flag_Dot_S := Val;
when 't' => Debug_Flag_Dot_T := Val;
when 'u' => Debug_Flag_Dot_U := Val;
when 'v' => Debug_Flag_Dot_V := Val;
when 'w' => Debug_Flag_Dot_W := Val;
when 'x' => Debug_Flag_Dot_X := Val;
when 'y' => Debug_Flag_Dot_Y := Val;
when 'z' => Debug_Flag_Dot_Z := Val;
end case;
end if;
end Set_Dotted_Debug_Flag;
end Debug;