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Rational Cross-Development Facility:
M68020/OS-2000
Release Information
Rev7_2_2 Release
\f
Copyright 1992 by Rational
Part Number: 508-003218-007
October 1992 (Software Release Rev7_2_2)
Motorola is a registered trademark of Motorola, Inc.
Rational is a registered trademark and Rational Environment is a
trademark of Rational.
Rational
3320 Scott Boulevard
Santa Clara, California 95054-3197
\f
Rev7_2_2 Release
1. Overview
Rev7_2_2 is a release of the Rational M68020/OS-2000
Cross-Development Facility (CDF). This release note lists new
features added, problems fixed, and problems still outstanding
since the previous release of the CDF.
The main features of this release are:
* Support for shared-code generics
* Support for spec/load views
* Support for code views
* Integration with "Program_Library" facilities, providing
faster prelinking
* Reduced compilation times
* Object files are now generated directly by the compiler
This release REQUIRES environment release D_12_4_7 or later.
This release generates code that is incompatible with code
generated by previous versions of the CDF.
1.1. Views in This Release
This release includes the following views:
* !TARGETS.IMPLEMENTATION.MC68020_OS2000_DEBUGGERS.REV11_SPEC
* !TARGETS.IMPLEMENTATION.MC68020_OS2000_DEBUGGERS.REV11_0_3
* !TARGETS.IMPLEMENTATION.MC68020_OS2000_TARGET.REV11_SPEC
* !TARGETS.IMPLEMENTATION.MC68020_OS2000_TARGET.CODE11_0_3
* !TARGETS.IMPLEMENTATION.MOTOROLA_68K.REV7_2_SPEC
* !TARGETS.IMPLEMENTATION.MOTOROLA_68K.CODE7_2_20
* !TARGETS.IMPLEMENTATION.MOTOROLA_68K_HOST.REV11_5_SPEC
* !TARGETS.IMPLEMENTATION.MOTOROLA_68K_HOST.CODE_REV7_13
* !TARGETS.IMPLEMENTATION.MOTOROLA_68K_TRANSFER.REV3_SPEC
* !TARGETS.IMPLEMENTATION.MOTOROLA_68K_TRANSFER.REV3_1_1
* !TARGETS.IMPLEMENTATION.OBJECT_CONVERSION.REV7_2_SPEC
* !TARGETS.IMPLEMENTATION.OBJECT_CONVERSION.CODE7_2_0
RATIONAL October 1992 1\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
* !TARGETS.IMPLEMENTATION.OBJECT_MODULE.REV7_2_SPEC
* !TARGETS.IMPLEMENTATION.OBJECT_MODULE.CODE7_2_0
* !TARGETS.IMPLEMENTATION.MC68020_OS2000_RUNTIMES.REV7_2_3
* !TARGETS.IMPLEMENTATION.MOTOROLA_68K_MACHINE.OS2000_11_0_6
1.2. Changed Predefined Units
The predefined units themselves have not changed, but their
location has. See Section 17, "Code Views and the Predefined
Subsystem," for more information.
2. Status of Software Problems in This Release
2.1. Reported Problems Fixed
* 0-0251-6
The compiler now deals more efficiently with constant strings.
* 1181016-Shei-Lsj
Internal_error - float constant out of range. This has been
fixed.
* 4814499-Etoi-Kjm
Pragma Pack on unconstrained arrays of booleans caused code
generation error. This has been fixed.
* 5307212-Stan-Mv
There were problems when declaring subtypes of short integer.
This has been fixed.
* 721413-Etoi-Mv
Internal error during phase: LAB. This has been fixed.
* 9883117-Etoi-Mv
The code generator caused an error when it encountered certain
combinations of multiply nested loops and case statements.
This has been fixed.
* 9723630-0104-6
Support for pragma Inline in compilation tools. Comp.Make now
codes bodies as quickly as possible after the spec. This is
not a full solution, but makes the problems much less likely
to occur.
* 0-0248-9
Combined views required because of inlining and generics.
Since shared-code generics are no longer proscribed from spec
views, it is now feasible to use spec-load subsystems with the
2 October 1992 RATIONAL\f
Rev7_2_2 Release
Mc68020_Os2000 target. Inlining subprogram calls through spec
views is not supported, but this does not prevent the use of
spec-load subsystems.
* 9723630-0022-1
Instantiation in limited private task type. Fixed in this
release.
* 9723630-0120-2
Slow compilation and linking. The
Cross_Cg.Linker_Generate_Map switch can now be used to control
whether a link map file is generated when a main program is
coded.
* 2887093-Shei-Jst
Middle pass problem with spliced contexts. Fixed in this
release.
* 5003830-Euse-Lsj
Constraint Error is no longer raised when compiling
Nosc.Speller.
* 1680472-Shei-Lsj
Constraint Error in stmt_gen.gen_stmt. This has been fixed.
* 4031776-Shei-Jst
Array inequality on packed arrays of discretes failed. This
has been fixed.
* 8518071-Etoi-Mv
Evaluation of 3D boolean array failed. This has been fixed.
* 3244099-Rati-Pbk
A request to zero only the portions of records which are
unused because of alignment issues; the loops that are
currently generated are expensive. This has been fixed.
* 7582583-Etoi-Mv
A representation clause was accepted after the default
determination of an entity. Since this situation is illegal
(according to the LRM), this should have been flagged as an
error. Fixed in Delta 3.0.
* SPR#900515-3
CDF Code generation error (internal error in WRI)
* SPR#900822-16, 900822-24
Deadlock or crash of operating system/ada runtime
* SPR#900928-3
Constraint Error when assigning integer
* SPR#911003-10
Unexpected Traps
RATIONAL October 1992 3\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
* SPR#911230-1
Package Command_Line cannot handle long lines
* SPR#920130-5
Compiler error in coding stage
* SPR#920203-24
Priorities of main programs and tasks
* SPR#920205-2
Rational allows pragma shared on records
* SPR#920305-1
CDF Linker aborts with errors (Undefined symbol)
* SPR#920323-13
Error in dead code elimination
* SPR#920505-17, 920522-13
Collection sizes too large - waste of heap memory
* SPR#920505-23
Elaboration fails (Array incorrectly initialized)
* MFP 74
[ITX] Illegal operand combination for Am.Move
* MFP 73
Program_Error in Piwg
* MFP 72
runtime problem
* MFP 71
[ITX] E-Stack underflow
* MFP 69
[WTR] Bad pc relative address
* MFP 68
[WTR] Compiler capacity exceeded
* MFP 67
[MID] in Decl_Gen.Gen_Decl - Constraint_Error (Null Access)
* MFP 66
[MID] Access_Gen.Operations.Unchecked_Deallocation:
Formal_Private_Class.
* MFP 64
[MID] Attempt to reconstruct object in current unit
* MFP 63
[MID] in Stmt_Gen.Gen_Stmt - Constraint_Error (Null Access)
4 October 1992 RATIONAL\f
Rev7_2_2 Release
* MFP 62
Sedt runtime problem
* MFP 60
[MID] in Stmt_Gen.Gen_Stmt - !Lrm.System.Assertion_Error
* MFP 59
[CSE] Internal error (Unhandled Exception => Constraint_Error
(Array Index)
* MFP 58
CDF accepts fixed point in out object, which leads to infinite
loop and storage leak
* MFP 57
[MID] in Decl_Gen.Gen_Decl - !Lrm.System.Assertion_Error
* MFP 55
[MID] in Code_Generation.Generate - Constraint_Error (Null
Access)
* MFP 54
Incorrect raise of Numeric_Error
* MFP 53
[MID] in Decl_Gen.Gen_Decl - Program_Error (prompt executed)
* MFP 53a
ERROR [LNK] Can't process library ...
* MFP 51
Debugger puts wrong indicies for arrays in record
* MFP 50
[MID] in Stmt_Gen.Gen_Stmt - !Lrm.System.Assertion_Error
* MFP 49
[ITX] Illegal operand combination for Am.Move.
* MFP 48
[MID] Context.Enclosing_Generic_Package_Id failed.
* MFP 46
[CHK] Not a valid exp_tree node
* MFP 45
[ITX] Illegal operand combination for Am.Move.
* MFP 44
[CHK] Null pointer.
* MFP 43
[MID] Shared instance subprogram lacks Original_Node
attribute: 0.DN_VOID.
RATIONAL October 1992 5\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
* MFP 42
[CHK] Object is down-level addressed.
* MFP 41
[MID] Unexpected Diana: Types.Arrays. Reconstruct_Array_Info
DN_IN_ID.
* MFP 40
[MID] Unexpected Diana: Types.Arrays. Reconstruct_Array_Info
DN_IN_ID.
* MFP 39
[CHK] dot does not have a basetype
* MFP 38
[MID] in Stmt_Gen.Gen_Stmt - !Lrm.System.Assertion_Error [This
is really the same as Mfp_35]
* MFP 37
[MID] in Code_Generation.Generate - Constraint_Error (Null
Access)
* MFP 36
[MID] Shared instance subprogram lacks Original_Node
attribute: 0.DN_VOID.
* MFP 35
Unimplemented feature: Task entry as shared generic actual
subprogram.
* MFP 34
Unimplemented feature: Shared generic subprogram skins over
Unchecked Conversion
* MFP 33
[ITX] Illegal address mode for Am.Add.
* MFP 32
[MID] Shared instance subprogram lacks Original_Node
attribute: 0.DN_VOID.
* MFP 31
[MID] Float_Util.Comparison_Operation: bad class.
* MFP 30
WARNING [MID] Reconstruction of instantiation base not
implemented
* MFP 29
[MID] Unimplemented Feature: Tasks in outermost level of
shared generic
* MFP 28
[MID] Unimplemented Feature: In-out array objects
6 October 1992 RATIONAL\f
Rev7_2_2 Release
* MFP 27
[MID] Attempt to reconstruct object in current unit
* MFP 26
Debugger Problem
* MFP 25
[Cse] Constraint_Error (Null Access) At #41b503, #4ff
* MFP 23
Bad code for variant record
* MFP 22
[ITX] Exception in CODER while coding routine _RECORD ...
* MFP 21
[CSE] Constraint_Error (Null Access) at #52A902, #5C6
* MFP 20
Execution-time misuse of base register
* MFP 18
[CSE] Constraint_Error (Type Range) at #3A4104, #4BC
* MFP 16
Ada runtime traps not handled as exceptions
* MFP 15
[ASY] Value for constant block does not fit element size
* MFP 14
[ITX] Exception in CODER while coding routine _RECORD ...
* MFP 13
[ITX] E-Stack underflow.
* MFP 11
[Cse] Constraint_Error (Type Range) At #320902, #C60
* MFP 10
[Itx] Attempt To Restore Spilled Register ...
* MFP 9
[Lab] Constraint_Error (Null Access) At #383102, #Be6
* MFP 8
[Evo] Internal Error In Phase Evo At ...
* MFP 7
[Mid] Unexpected Diana: Instantiation_Checking.Get_Indices
* MFP 6
[Itx] Internal Coder Stack Inconsistency
RATIONAL October 1992 7\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
* MFP 4
[Mid] In Stmt_Gen.Gen_Stmt - !Lrm.System.Assertion_Error
* MFP 1
[Mid] In Dec_Gen.Gen_Decl Assertion_Error At #3aa902, #B09
2.2. Reported Problems Not Fixed in This Release
The following problems reported against previous revisions are
not fixed in the current release:
* SPR#910614-1
Memory allocated in a declare block is not reused in
subsequent non-overlapping declare blocks.
* SPR#910731-1
Text_Io.Get_Line skips a line of input.
* MFP 65
[MID] Unimplemented Feature: Unchecked_Conversion of a formal
private type used as a formal subprogram.
* MFP 54a
The debugger can be invoked correctly, but the directory of
the program must be given as part of the name of the program.
* MFP 47 Debugger unable to put complex packed object
* MFP 24 Unimplemented Feature: Formal fixed point types
* MFP 19 Size representation clause failed to compile
* MFP 17 [WTR] Lost symbol. when coding task body
* MFP 12 [Chk] Object Is Down-Level Addressed.
* MFP 5 Representation Clause Permitted After Forcing Occurrence
* MFP 3 [Mid] In Decl_Gen.Gen_Decl Assertion_Error At #3abd02,
#C9
* MFP 2 Undefined Symbol Referenced During Link Time
2.3. Other Issues Not Dealt With in This Release
This section contains suggestions and errors that need further
clarification or evaluation.
* 9723630-0020-9, 9723630-0067-2, SPR#890627-3, SPR#980731-3
Odd length of modules. Will be considered for a future
release.
8 October 1992 RATIONAL\f
Rev7_2_2 Release
* 4815206-Etoi-Kjm
Stack usage for main programs have changed radically. The
scheme for determining the size of discriminated records was
improved, causing an object which used to be allocated on the
heap to be allocated on the stack. It appears from the PRS
that the customer has a tool which thinks that this storage is
never assigned to, although the generated code does seem to be
doing the assignment. This may no longer be a problem.
* 0-0215-1
Warning messages "Tree_Check_Error" still remain. Waiting for
test case from customer.
* 9723630-0105-1
An assignment statement that doesn't work. This is not
reproduceable. Waiting for test case from customer.
* SPR#881116-1
Minimize run-time library checks of linker command file
* SPR#881212-2
Error path starting at /h0 costs memory
* SPR#881222-3
Add option "CPU" to Debug.Invoke
* SPR#890509-1
Debugger support for tuning heap and stack sizes
* SPR#890518-2
Incremental change of pragma main
3. Changes and New Features
The following features have been changed or added. Consult your
Rational technical representative for more details.
3.1. Improvements in Compiler Operation
3.1.1. Incremental Changes
Support for incremental operations has been improved; in
particular, the user may now make incremental changes in coded
package specifications. As a result, the OS-2000 compiler now
supports all incremental operations provided by the R1000's
native compiler.
RATIONAL October 1992 9\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
3.1.2. Compile-Time Improvements
Compile-time when handling floating point literals has been
greatly reduced. This is especially visible with large array
aggregates consisting of float literals.
The Build_Conflict_Graph algorithm now runs 2ver fewer nodes,
which improves performance because it is an O(N) algorithm.
Several expensive optimizer algorithms were improved to reduce
compile times.
The assembly-code writer has been replaced with an object-code
writer. This eliminates the step of running the assembler, which
was previously a bottleneck in the code generation process, and
results in a substantial reduction in compile time. If the
Cross_Cg.Asm_Listing switch is set to True, a listing file is
generated by running the assembly-code writer in addition to the
object-code writer.
3.1.3. More Efficient Use of Compiler Streams
Invocations of the CDF back ends have always been serialized;
that is, each compiler stream can only handle a single
compilation at a time. This is still true, but it is now the
case for main programs that the serialization lock is
relinquished as soon as the linker is invoked. This means that
the compilation stream on which a main program is being coded is
freed for another compilation as soon as the linker is invoked,
rather than after it completes.
3.1.4. Address Clause Support
Support for address clauses on objects has been improved:
* The address need not be determinable at compile time if the
object is an array or record.
* Addresses clauses may now be used on arrays and records whose
size is not determinable at compile time.
The address given in the address clause must be determinable at
compile time unless the specified object is an array or record,
in which case the address may be dynamic. An address is
considered to be determinable at compile time only if it takes
the form of a call to System.To_Address with a compile-time
determinable argument.
An object may not have both pragma Import_Object and an address
clause.
10 October 1992 RATIONAL\f
Rev7_2_2 Release
An address clause with a static address will cause the object to
be addressed using absolute addressing. Pragma Import_Object
will cause the object to be addressed A5-relative, with the
linker resolving the external symbolic name to get the offset.
An object having an address clause is NOT subject to default
initialization unless this is explicitly requested using pragma
Initialize. Pragma Initialize has the following format:
pragma INITIALIZE(simple_name);
This pragma causes the imported or address-claused object denoted
by simple_name to become subject to default initialization.
The parameter to pragma Initialize, simple_name, must denote a
variable declared earlier in the same declarative part. The
variable must be an array or record and must have an address
clause or pragma Import_Object applied to it before the
occurrence of pragma Initialize. The object must not have an
explicit initial value.
3.1.5. <Elab_Order_Listing> file
If the Cross_Cg.Elab_Order_Listing switch is set to True, the
Os2000 CDF now generates an <Elab_Order_Listing> file when a main
program body is coded. This file consists of a list of the fully
qualified names of the units in the closure of the main program,
listed in the order of their elaboration. The file also includes
comments indicating how a unit came to be included in the
closure. The format of this file is suitable for use as an
indirect file in a naming expression, although names of any units
out of code views will not be resolvable.
When the main program is demoted to installed, the
<Elab_Order_Listing> file is destroyed.
3.1.6. Object-Module Converter
The object-module converter is now run automatically as part of
coding a main program, generating an <Os2000> file. When a main
program is demoted from coded to installed, the <Os2000> file is
automatically deleted.
Since the <Os2000> file is now automatically generated, the
compiler no longer creates a <Exe> file by default. An <Exe>
file can be created by setting the Cross_Cg.Produce_Full_Exe
switch to true.
RATIONAL October 1992 11\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
3.2. Improvements in Generated Code
Compiler code generation has been improved in the following areas
(among others):
* The propagation of constraint information has been improved.
This improves the elimination of unnecessary overflow and
constraint checks.
* To reduce overall register costs, the allocation of common
subexpressions has been integrated with that of other objects.
* The allocation of volatile registers has been improved. This
increases the number of opportunities for stack frame
elimination when the debugging level is PARTIAL or NONE.
* Object preferencing has been improved, reducing the number of
move instructions.
* Processing of case statements by the optimizer has been much
improved. The optimizer chooses from a number of different
techniques to implement each case statement, depending on
factors such as its size and density. Different techniques
are combined when appropriate, for example to handle a large,
generally sparse case statement having small regions of high
density.
* Constant folding has been expanded. In particular, constant
folding of floating point expressions has been improved.
3.3. Shared-Code Generics
Users may request that all instantiations of a given generic
share the same general code, that all instantiations of a given
generic have their own custom code, or that all instantiations by
default share the same code but that specified instantiations
have their own code. Two new pragmas, Generic_Policy and
Instance_Policy, are used to specify the manner in which code is
to be generated for generics.
3.3.1. Pragma Generic_Policy
pragma GENERIC_POLICY ([GENERIC_UNIT =>] simple_name,
[CODE =>] REPLICATED | SHARED)
The simple name must denote a generic package or subprogram.
The pragma and the declaration of the named generic must occur
immediately within the same declarative part or package
specification; the generic declaration must occur before the
pragma. Only one Generic_Policy pragma may be applied to a
generic.
12 October 1992 RATIONAL\f
Rev7_2_2 Release
The pragma specifies how code should be generated for the
generic. If the Shared option is selected, code will be
generated for the generic itself; this code will be used for all
instantiations of the generic (except as noted below). If the
Replicated option is selected, code will not be generated for the
generic, but rather for each instantiation of the generic. The
replicated code for an instantiation will be smaller and faster
than the shared code for the corresponding generic.
Demoting the body of a replicated generic to installed causes all
instantiations of that generic to also be demoted to installed,
whereas demoting the body of a shared generic to installed does
not cause demotion of any instantiations (except those that were
explicitly made replicated using pragma Instance_Policy).
If pragma Generic_Policy is not specified, the compiler decides
between Shared and Replicated. At present, the default is always
Replicated.
Replicated generics are not permitted in spec views (therefore, a
generic in a spec view must also have a generic policy pragma
specifying that the code is to be shared). The generic policy
must be the same for corresponding generics in a load view and
spec view. This is currently not enforced, so care should be
taken to ensure that all generics which appear in a spec view are
implemented as shared-code generics.
To simplify the rules for spec/load view compatibility, and
because complete control is afforded by the pragmas defined here,
pragma Optimize does not play a role in selecting between shared
and replicated code.
3.3.2. Pragma Instance_Policy
When a policy of shared has been selected for a generic, the user
may still wish for certain instantiations to have replicated code
for performance reasons. Pragma Instance_Policy allows this to
be specified for a particular instantiation.
pragma INSTANCE_POLICY ([INSTANTIATION =>] simple_name,
[CODE =>] REPLICATED)
The simple name must denote an instantiation of a generic (which
may be either shared or replicated).
The pragma and the declaration of the named instantiation must
occur immediately within the same declarative part or package
specification; the instantiation must occur before the pragma.
If the simple_name names several overloaded subprogram
instantiations in the current declarative part or package
specification, the pragma applies to all of them. Only one
Instance_Policy pragma may be applied to a single instantiation.
RATIONAL October 1992 13\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
The pragma is ignored if the instantiation refers to a generic in
a spec view.
3.3.3. Shared-Code Generic Features
The following subset of shared-code generic features is supported
in this release:
* Formal floating point types
* Formal private and limited private types
* Formal access types
* Formal subprograms
* Formal objects of mode IN
* Formal arrays
* Formal discrete and integer types
* Formal scalar objects of mode IN OUT
* Formal nondiscriminated record objects of mode IN OUT
* Formal array objects of mode IN OUT
* Generics (shared or replicated) nested immediately within
shared generic packages
* Subunits, and subunits of subunits
A Generic_Policy pragma with a policy of Shared will be rejected
of the generic has any of the following formal parameters:
* Formal fixed point types
* Formal discriminated private and limited private types
* IN OUT discriminated objects
* IN OUT formal private or limited private objects
Exceptions declared in shared generics are not handled strictly
correctly. The Ada language requires that such exceptions be
replicated for each instantiation (as happens naturally when a
macro-expansion technique is used); at the present time, this
does not occur for shared generics.
There is a temporary restriction on the use of bodiless library
unit generic packages. Use of this construct will result in an
error at code generation time.
14 October 1992 RATIONAL\f
Rev7_2_2 Release
The temporary restriction concerning the declaration of task
types and objects in shared generic package specs and bodies has
been removed; such declarations will now be correctly processed.
3.3.4. Guidelines for Using Shared Code Generics
This section discusses the performance impact of shared code
generics and offers some suggestions on when to use them and how
to optimize performance when they are used. In general, shared
code generics will be less time efficient than replicated
generics, but will often be more space efficient as well as
permitting the spec of the generic to be placed in a spec view.
The code is less efficient because code is generated to handle
all the parameters with which a generic can be instantiated,
rather than only the code necessary for the specific parameters
which are available at the instantiation site (where code for
replicated generics is generated). Shared generics must also
manage the state of a generic package (i.e., objects declared in
the package). This is always less efficient, since it requires
an extra level of indirection, and sometimes more than one. In
general, shared code generics will be more space efficient
because code will only be generated once rather than at each of
the instatiation sites, but only if there are several
instantiations of the generic (it is always more efficient to use
replicated generics if there is only one instantiation).
It is also possible that a shared code generic will allocate more
heap or stack than the same generic replicated. This occurs when
the shared generic needs to allocate space but has less
information about how much space to allocate than it would if it
were replicated. For instance, suppose a generic has a formal in
object which is used as a bound in an array. If the generic is
replicated, the compiler may be aware of the value that has been
give to the object, in which case it will allocate the array
statically. If the generic is shared, however, the array must be
allocated dynamically, since the compiler must generate code
without knowing the bounds of the array. Whether more space will
be used because of a given generic depends heavily on what kinds
of generic parameters it takes, so here is a type by type list of
some of the effects.
* Formal Floating Point Types
All simple objects of a formal floating point type will cause
more stack space to be allocated, since the compiler allocates
enough space to store a double-word value. Arrays of formal
floats will be only as long as is needed, but they will be
dynamic in all cases, since the size of the element cannot be
known at compile time.
* Formal Subprograms
All formal subprograms are implemented by passing a compiler
generated subprogram which does any needed type conversions
and then calls the actual subprogram. They have little effect
on the stack or heap used, although they do cause an extra
RATIONAL October 1992 15\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
stack frame to be allocated.
* Formal Access Types
No extra space is allocated for an object of a formal access
type, but extra master layers may be created in some cases
where we are unable to tell whether the access type is an
access to a task type.
* Formal Objects of Mode IN
Formal IN objects have no significant effect on the amount of
space allocated.
* Formal Arrays
Formal arrays cause little difference in the amount of space
allocated on either heap or stack.
* Formal Private Types
Formal private types can incur much more overhead with shared
code generics than with replicated generics. This is because
the compiler must now allow for the possiblity of any type.
In general, objects of a formal private type will be allocated
a single word on the stack. If the actual type is a simple
type (i.e. a scalar), the word will contain the value of
object. If the actual type is more complex, the word will
point to another object allocated dynamically which will
contain the actual data, or possibly more pointers to other
dynamic objects. With this scheme, little more space is
allocated that is necessary, but space which would have been
on the stack in a replicated generic will now be allocated
dynamically, sometimes on the heap. Also, since pointers must
be dereferenced (in some cases a chain of pointers must be
followed), operations on formal private types will be slower
than in replicated generics. In many cases, runtime calls are
made to perform operations (e.g., equality tests, assignment,
function return of formal privates, etc).
* Formal Discrete and Integer Types
The only effect of formal discrete and integer types is that
some arrays which would be allocated statically will become
dynamic.
* Formal Scalars of Mode IN OUT
In out objects cause little change in the amount of space
allocated.
With all types an effort has been made to ensure that shared code
generics behave in the same way as the same generic does when
replicated, including raising the same errors at the same
locations. The only exception to this is that in some cases with
formal floating point types Constraint_Error will be raised where
Numeric_Error was previously raised.
16 October 1992 RATIONAL\f
Rev7_2_2 Release
3.4. Code Views and the Predefined Subsystem
Prior to this release, code views could not be transferred
between machines because the link names of the predefined units
(e.g. system) were not the same on different machines. This has
been corrected by placing the predefined units in a subsystem
view called !Targets.Predefined. As a result, new models are
required which point to the new predefined units.
This new organization permits worlds which were compiled with
previous compilers to coexist on the same machine with worlds
compiled with the new compiler. Note, however, that modules
produced by one version of the compiler cannot be linked with
modules produced by another version.
Existing subsystem views which are to be compiled with the new
compiler must have their models replaced. The links in other
worlds must be changed to point to the new predefined units. A
tool is provided with this release which will demote units in
existing worlds and update these worlds for the Rev7_2 compiler -
see the installation notes for more details.
3.5. Other New Features
3.5.1. Pragma Assert
pragma ASSERT([Predicate =>] boolean_expression
[, [Class =>] integer_expression]);
When the pragma is encountered, boolean_expression is evaluated.
If the resulting value is FALSE, the exception
System.Assertion_Error is raised; otherwise, no further action is
taken. If System.Assertion_Error is not defined, Program_Error
is raised instead.
The integer_expression is ignored; for the moment, it is allowed
only for compatibility with the R1000 Ada code generator.
This pragma may appear wherever a statement or declaration would
be legal.
3.5.2. Pragma Collection_Policy
The pragma Collection_Policy can be used to customize storage
management. The complete syntax for this pragma is:
pragma COLLECTION_POLICY (Access_Type => access_type,
Initial_Size => integer_expression
[, Extensible => boolean_expression]
[, Extension_Size =>
integer_expression]);
RATIONAL October 1992 17\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
This pragma must appear in the same declarative region as the
access type that it applies to, and the access type's full type
declaration must occur before the pragma. This implies that, in
order to use a private type for the Access_Type argument, the
pragma must be given in the private part after the complete
access-type declaration. At most one such pragma is allowed for
a given access type.
The Collection_Policy pragma is ignored when:
* a `Storage_Size clause is given for the access type; in this
case, the Storage_Size takes precedence. This is because a
statement of the form:
for X'Storage_Size use size;
is equivalent to:
pragma Collection_Policy (Access_Type => X,
Initial_Size => size,
Extensible => False);
* the pragma follows a forcing occurrence of the access type
(LRM 13.1.6).
Access_Type and Initial_Size are required. Extensible and
Extension_Size are optional. All arguments must be specified
using named association, as shown in all examples in this
pragma's discussion.
If Extensible is False, the collection is nonextensible. If
Extensible is True, which is the default if not specified, then
the collection will be extended by a certain number of storage
units when it fills up, if it is possible to do so. The number
of storage units in the extension size is chosen by the runtime
system unless the Extension_Size is specified.
Extension_Size allows the user to specify the number of storage
units to be allocated whenever the collection needs to be
extended. This parameter is ignored if Extensible is False.
Initial_Size gives the size in storage units of the collection
created at the point of the type declaration. If no pragma
Collection_Policy is used, the initial size of the collection is
determined by the runtime system. A nonpositive Initial_Value on
a nonextensible collection raises the Storage_Error exception in
the situations described below. Currently,
for X'Storage_Size use 0;
means that no collection should be created for X. The same
effect is achieved with pragma Collection_Policy by giving:
18 October 1992 RATIONAL\f
Rev7_2_2 Release
pragma Collection_Policy (Access_Type => X,
Initial_Size => 0,
Extensible => False);
In both of the above cases, an attempt to use an allocator will
result in a Storage_Error exception. However, you could also
say:
pragma Collection_Policy (Access_Type => x,
Initial_Size => 0,
Extensible => True,
Extension_Size => 100);
which means "do not create a collection until an allocation is
performed." When the first allocator is executed, the collection
is created with the extension size.
3.5.3. New Attribute: 'Homogeneous
Applicable to an access type; yields a Boolean value. The value
returned is False if the designated type given in the access type
declaration is an unconstrained array type or an unconstrained
discriminated record type, and True otherwise.
If the attribute is True, then all objects in the collection must
have the same size. The converse, however, is not true.
Note that the attribute is a property of the type, not of the
subtype. Thus, for any access type T, T'Homogeneous =
T'Base'Homogeneous.
For example:
type T1 is access String;
type T2 is new T1 (1 .. 10); -- T2'Homogeneous = False
At the implementation level, the attribute indicates whether or
not constraint information needs to be stored with allocated
objects.
3.5.4. Object Writer
The compiler now generates an object file directly. Previously,
the compiler generated an assembly file and invoked the assembler
to obtain an object file. This change results in code generation
times that are approximately 25% faster. As a consequence, the
Cross_Cg.Asm_Source switch is now obsolete. To obtain an assembly
listing, use the Cross_Cg.Listing switch.
RATIONAL October 1992 19\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
3.5.5. Elaboration Checks
The CDF now supports the Suppress_Elaboration_Objects switch,
which eliminates all elaboration objects and the code to test and
set them. When this new switch is set to true, the compiler
behaves as if the user had inserted:
pragma Suppress (Elaboration_Check, On => Snaggle);
for each subprogram 'snaggle' in each compilation unit in the
library. This significantly reduces the amount of initialization
code in Ada units.
Because the prelinker guarantees that spec/load subsystems are
elaborated in layers, the compiler never generates elaboration
checks on cross-subsystem calls to subprograms that are imported
via a spec view. Due to this, it is not necessary that the
Suppress_Elaboration_Objects switch have the same value in
corresponding spec and load views.
Elaboration objects for generics are NOT affected by the
Suppress_Elaboration_Objects switch.
20 October 1992 RATIONAL\f
Rev7_2_2 Release
Contents
1. Overview 1
1.1. Views in This Release 1
1.2. Changed Predefined Units 2
2. Status of Software Problems in This Release 2
2.1. Reported Problems Fixed 2
2.2. Reported Problems Not Fixed in This Release 8
2.3. Other Issues Not Dealt With in This Release 8
3. Changes and New Features 9
3.1. Improvements in Compiler Operation 9
3.1.1. Incremental Changes 9
3.1.2. Compile-Time Improvements 10
3.1.3. More Efficient Use of Compiler Streams 10
3.1.4. Address Clause Support 10
3.1.5. <Elab_Order_Listing> file 11
3.1.6. Object-Module Converter 11
3.2. Improvements in Generated Code 12
3.3. Shared-Code Generics 12
3.3.1. Pragma Generic_Policy 12
3.3.2. Pragma Instance_Policy 13
3.3.3. Shared-Code Generic Features 14
3.3.4. Guidelines for Using Shared Code Generics 15
3.4. Code Views and the Predefined Subsystem 17
3.5. Other New Features 17
3.5.1. Pragma Assert 17
3.5.2. Pragma Collection_Policy 17
3.5.3. New Attribute: 'Homogeneous 19
3.5.4. Object Writer 19
3.5.5. Elaboration Checks 20
RATIONAL October 1992 iii\f
Rational Cross-Development Facility:
M68020/OS-2000 Release Information
iv October 1992 RATIONAL\f
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72 235 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#900515-3) show
96 248 moveto
(CDF Code generation error \050internal error in WRI\051) show
72 266 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#900822-16, 900822-24) show
96 279 moveto
(Deadlock or crash of operating system/ada runtime) show
72 297 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#900928-3) show
96 310 moveto
(Constraint Error when assigning integer) show
72 328 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#911003-10) show
96 341 moveto
(Unexpected Traps) show
72 359 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#911230-1) show
96 372 moveto
(Package Command_Line cannot handle long lines) show
72 390 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#920130-5) show
96 403 moveto
(Compiler error in coding stage) show
72 421 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#920203-24) show
96 434 moveto
(Priorities of main programs and tasks) show
72 452 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#920205-2) show
96 465 moveto
(Rational allows pragma shared on records) show
72 483 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#920305-1) show
96 496 moveto
(CDF Linker aborts with errors \050Undefined symbol\051) show
72 514 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#920323-13) show
96 527 moveto
(Error in dead code elimination) show
72 545 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#920505-17, 920522-13) show
96 558 moveto
(Collection sizes too large - waste of heap memory) show
72 576 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#920505-23) show
96 589 moveto
(Elaboration fails \050Array incorrectly initialized\051) show
72 607 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 74) show
96 620 moveto
([ITX] Illegal operand combination for Am.Move) show
72 638 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 73) show
96 651 moveto
(Program_Error in Piwg) show
72 669 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 72) show
96 682 moveto
(runtime problem) show
72 700 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 71) show
96 713 moveto
([ITX] E-Stack underflow) show
72 756 moveto
17 /AvantGarde-Book SelectFont
(RATIONAL) show
10 /Palatino-Roman SelectFont
( October 1992) show
310.940 MX
(3) show
EndPage
%%Page: 4 6
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
(Rational Cross-Development Facility:) show
72 48 moveto
(M68020/OS-2000 Release Information) show
72 84 moveto
11 /Palatino-Roman SelectFont
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 69) show
96 97 moveto
([WTR] Bad pc relative address) show
72 115 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 68) show
96 128 moveto
([WTR] Compiler capacity exceeded) show
72 146 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 67) show
96 159 moveto
([MID] in Decl_Gen.Gen_Decl - Constraint_Error \050Null Access\051) show
72 177 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 66) show
96 190 moveto
([MID] Access_Gen.Operations.Unchecked_Deallocation: Formal_Private_Class.) show
72 208 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 64) show
96 221 moveto
([MID] Attempt to reconstruct object in current unit) show
72 239 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 63) show
96 252 moveto
([MID] in Stmt_Gen.Gen_Stmt - Constraint_Error \050Null Access\051) show
72 270 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 62) show
96 283 moveto
(Sedt runtime problem) show
72 301 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 60) show
96 314 moveto
([MID] in Stmt_Gen.Gen_Stmt - !Lrm.System.Assertion_Error) show
72 332 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 59) show
96 345 moveto
([CSE] Internal error \050Unhandled Exception => Constraint_Error \050Array Index\051) show
72 363 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 58) show
96 376 moveto
(CDF accepts fixed point in out object, which leads to infinite loop and storage leak) show
72 394 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 57) show
96 407 moveto
([MID] in Decl_Gen.Gen_Decl - !Lrm.System.Assertion_Error) show
72 425 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 55) show
96 438 moveto
([MID] in Code_Generation.Generate - Constraint_Error \050Null Access\051) show
72 456 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 54) show
96 469 moveto
(Incorrect raise of Numeric_Error) show
72 487 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 53) show
96 500 moveto
([MID] in Decl_Gen.Gen_Decl - Program_Error \050prompt executed\051) show
72 518 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 53a) show
96 531 moveto
(ERROR [LNK] Can't process library ...) show
72 549 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 51) show
96 562 moveto
(Debugger puts wrong indicies for arrays in record) show
72 580 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 50) show
96 593 moveto
([MID] in Stmt_Gen.Gen_Stmt - !Lrm.System.Assertion_Error) show
72 611 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 49) show
96 624 moveto
([ITX] Illegal operand combination for Am.Move.) show
72 642 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 48) show
96 655 moveto
([MID] Context.Enclosing_Generic_Package_Id failed.) show
72 673 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 46) show
96 686 moveto
([CHK] Not a valid exp_tree node) show
72 704 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 45) show
96 717 moveto
([ITX] Illegal operand combination for Am.Move.) show
72 756 moveto
10 /Palatino-Roman SelectFont
(4) show
308.731 MX
(October 1992 ) show
17 /AvantGarde-Book SelectFont
( RATIONAL) show
EndPage
%%Page: 5 7
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
390.180 MX
(Rev7_2_2 Release) show
72 72 moveto
11 /Palatino-Roman SelectFont
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 44) show
96 85 moveto
([CHK] Null pointer.) show
72 103 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 43) show
96 116 moveto
([MID] Shared instance subprogram lacks Original_Node attribute: 0.DN_VOID.) show
72 134 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 42) show
96 147 moveto
([CHK] Object is down-level addressed.) show
72 165 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 41) show
96 178 moveto
([MID] Unexpected Diana: Types.Arrays. Reconstruct_Array_Info DN_IN_ID.) show
72 196 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 40) show
96 209 moveto
([MID] Unexpected Diana: Types.Arrays. Reconstruct_Array_Info DN_IN_ID.) show
72 227 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 39) show
96 240 moveto
([CHK] dot does not have a basetype) show
72 258 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 38) show
96 271 moveto
([MID] in) 2.092 WS
4.843 MX
(Stmt_Gen.Gen_Stmt - !Lrm.System.Assertion_Error [This is really the same as) 2.093 WS
96 284 moveto
(Mfp_35]) show
72 302 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 37) show
96 315 moveto
([MID] in Code_Generation.Generate - Constraint_Error \050Null Access\051) show
72 333 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 36) show
96 346 moveto
([MID] Shared instance subprogram lacks Original_Node attribute: 0.DN_VOID.) show
72 364 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 35) show
96 377 moveto
(Unimplemented feature: Task entry as shared generic actual subprogram.) show
72 395 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 34) show
96 408 moveto
(Unimplemented feature: Shared generic subprogram skins over Unchecked Conversion) show
72 426 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 33) show
96 439 moveto
([ITX] Illegal address mode for Am.Add.) show
72 457 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 32) show
96 470 moveto
([MID] Shared instance subprogram lacks Original_Node attribute: 0.DN_VOID.) show
72 488 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 31) show
96 501 moveto
([MID] Float_Util.Comparison_Operation: bad class.) show
72 519 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 30) show
96 532 moveto
(WARNING [MID] Reconstruction of instantiation base not implemented) show
72 550 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 29) show
96 563 moveto
([MID] Unimplemented Feature: Tasks in outermost level of shared generic) show
72 581 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 28) show
96 594 moveto
([MID] Unimplemented Feature: In-out array objects) show
72 612 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 27) show
96 625 moveto
([MID] Attempt to reconstruct object in current unit) show
72 643 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 26) show
96 656 moveto
(Debugger Problem) show
72 674 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 25) show
96 687 moveto
([Cse] Constraint_Error \050Null Access\051 At #41b503, #4ff) show
72 705 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 23) show
96 718 moveto
(Bad code for variant record) show
72 756 moveto
17 /AvantGarde-Book SelectFont
(RATIONAL) show
10 /Palatino-Roman SelectFont
( October 1992) show
310.940 MX
(5) show
EndPage
%%Page: 6 8
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
(Rational Cross-Development Facility:) show
72 48 moveto
(M68020/OS-2000 Release Information) show
72 84 moveto
11 /Palatino-Roman SelectFont
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 22) show
96 97 moveto
([ITX] Exception in CODER while coding routine _RECORD ...) show
72 115 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 21) show
96 128 moveto
([CSE] Constraint_Error \050Null Access\051 at #52A902, #5C6) show
72 146 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 20) show
96 159 moveto
(Execution-time misuse of base register) show
72 177 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 18) show
96 190 moveto
([CSE] Constraint_Error \050Type Range\051 at #3A4104, #4BC) show
72 208 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 16) show
96 221 moveto
(Ada runtime traps not handled as exceptions) show
72 239 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 15) show
96 252 moveto
([ASY] Value for constant block does not fit element size) show
72 270 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 14) show
96 283 moveto
([ITX] Exception in CODER while coding routine _RECORD ...) show
72 301 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 13) show
96 314 moveto
([ITX] E-Stack underflow.) show
72 332 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 11) show
96 345 moveto
([Cse] Constraint_Error \050Type Range\051 At #320902, #C60) show
72 363 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 10) show
96 376 moveto
([Itx] Attempt To Restore Spilled Register ...) show
72 394 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 9) show
96 407 moveto
([Lab] Constraint_Error \050Null Access\051 At #383102, #Be6) show
72 425 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 8) show
96 438 moveto
([Evo] Internal Error In Phase Evo At ...) show
72 456 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 7) show
96 469 moveto
([Mid] Unexpected Diana: Instantiation_Checking.Get_Indices) show
72 487 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 6) show
96 500 moveto
([Itx] Internal Coder Stack Inconsistency) show
72 518 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 4) show
96 531 moveto
([Mid] In Stmt_Gen.Gen_Stmt - !Lrm.System.Assertion_Error) show
72 549 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 1) show
96 562 moveto
([Mid] In Dec_Gen.Gen_Decl Assertion_Error At #3aa902, #B09) show
72 600 moveto
13 /Palatino-Bold SelectFont
(2.2. Reported Problems Not Fixed in This Release) show
72 624 moveto
11 /Palatino-Roman SelectFont
(The following problems reported against previous revisions are) show
11 /Palatino-Italic SelectFont
( not) show
11 /Palatino-Roman SelectFont
( fixed in the current release:) show
72 642 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#910614-1) show
96 655 moveto
(Memory allocated in) 0.820 WS
3.569 MX
(a declare block is not reused in subsequent non-overlapping declare) 0.819 WS
96 668 moveto
(blocks.) show
72 686 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#910731-1) show
96 699 moveto
(Text_Io.Get_Line skips a line of input.) show
72 756 moveto
10 /Palatino-Roman SelectFont
(6) show
308.731 MX
(October 1992 ) show
17 /AvantGarde-Book SelectFont
( RATIONAL) show
EndPage
%%Page: 7 9
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
390.180 MX
(Rev7_2_2 Release) show
72 72 moveto
11 /Palatino-Roman SelectFont
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 65) show
96 85 moveto
([MID] Unimplemented Feature: Unchecked_Conversion of) 0.476 WS
3.227 MX
(a formal private type used as a) 0.477 WS
96 98 moveto
(formal subprogram.) show
72 116 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 54a) show
96 129 moveto
(The debugger can be invoked correctly, but the directory of the program) 0.495 WS
3.244 MX
(must be given as) 0.494 WS
96 142 moveto
(part of the name of the program.) show
72 160 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 47 Debugger unable to put complex packed object) show
72 178 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 24 Unimplemented Feature: Formal fixed point types) show
72 196 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 19 Size representation clause failed to compile) show
72 214 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 17 [WTR] Lost symbol. when coding task body) show
72 232 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 12 [Chk] Object Is Down-Level Addressed.) show
72 250 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 5 Representation Clause Permitted After Forcing Occurrence) show
72 268 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 3 [Mid] In Decl_Gen.Gen_Decl Assertion_Error At #3abd02, #C9) show
72 286 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(MFP 2 Undefined Symbol Referenced During Link Time) show
72 324 moveto
13 /Palatino-Bold SelectFont
(2.3. Other Issues Not Dealt With in This Release) show
72 348 moveto
11 /Palatino-Roman SelectFont
(This section contains suggestions and errors that need further clarification or evaluation.) show
72 366 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(9723630-0020-9, 9723630-0067-2, SPR#890627-3, SPR#980731-3) show
96 379 moveto
(Odd length of modules. Will be considered for a future release.) show
72 397 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(4815206-Etoi-Kjm) show
96 410 moveto
(Stack usage for main) 1.384 WS
4.135 MX
(programs have changed radically. The scheme for determining the) 1.385 WS
96 423 moveto
(size of discriminated records was improved, causing an object which used to be allocated) 0.790 WS
96 436 moveto
(on the heap to be allocated on the stack. It appears from) 0.946 WS
3.697 MX
(the PRS that the customer has a) 0.947 WS
96 449 moveto
(tool which thinks that this) 0.750 WS
3.499 MX
(storage is never assigned to, although the generated code does) 0.749 WS
96 462 moveto
(seem to be doing the assignment. This may no longer be a problem.) show
72 480 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(0-0215-1) show
96 493 moveto
(Warning messages "Tree_Check_Error" still remain. Waiting for test case from customer.) show
72 511 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(9723630-0105-1) show
96 524 moveto
(An assignment statement that) 1.824 WS
4.575 MX
(doesn't work. This is not reproduceable. Waiting for test) 1.825 WS
96 537 moveto
(case from customer.) show
72 555 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#881116-1) show
96 568 moveto
(Minimize run-time library checks of linker command file) show
72 586 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#881212-2) show
96 599 moveto
(Error path starting at /h0 costs memory) show
72 617 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#881222-3) show
96 630 moveto
(Add option "CPU" to Debug.Invoke) show
72 648 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#890509-1) show
96 661 moveto
(Debugger support for tuning heap and stack sizes) show
72 679 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(SPR#890518-2) show
96 692 moveto
(Incremental change of pragma main) show
72 756 moveto
17 /AvantGarde-Book SelectFont
(RATIONAL) show
10 /Palatino-Roman SelectFont
( October 1992) show
310.940 MX
(7) show
EndPage
%%Page: 8 10
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
(Rational Cross-Development Facility:) show
72 48 moveto
(M68020/OS-2000 Release Information) show
72 88 moveto
15 /Palatino-Bold SelectFont
(3. Changes and New Features) show
72 112 moveto
11 /Palatino-Roman SelectFont
(The following features have been changed) 5.113 WS
7.862 MX
(or added. Consult your Rational technical) 5.112 WS
72 125 moveto
(representative for more details.) show
72 163 moveto
13 /Palatino-Bold SelectFont
(3.1. Improvements in Compiler Operation) show
72 200 moveto
12 /Palatino-Bold SelectFont
(3.1.1. Incremental Changes) show
72 224 moveto
11 /Palatino-Roman SelectFont
(Support for) 1.003 WS
3.754 MX
(incremental operations has been improved; in particular, the user may now make) 1.004 WS
72 237 moveto
(incremental changes in coded package specifications. As) 1.749 WS
4.498 MX
(a result, the OS-2000 compiler now) 1.748 WS
72 250 moveto
(supports all incremental operations provided by the R1000's native compiler.) show
72 287 moveto
12 /Palatino-Bold SelectFont
(3.1.2. Compile-Time Improvements) show
72 311 moveto
11 /Palatino-Roman SelectFont
(Compile-time when handling floating point literals has been greatly reduced.) 0.585 WS
3.336 MX
(This is especially) 0.586 WS
72 324 moveto
(visible with large array aggregates consisting of float literals.) show
72 342 moveto
(The Build_Conflict_Graph algorithm now runs over fewer nodes, which improves) 0.346 WS
3.095 MX
(performance) show
72 355 moveto
(because it is an O\050N\051) show
0 -2.750 rmoveto
8 /Palatino-Roman SelectFont
(2) show
11 /Palatino-Roman SelectFont
0 2.750 rmoveto
( algorithm.) show
72 373 moveto
(Several expensive optimizer algorithms were improved to reduce compile times.) show
72 391 moveto
(The assembly-code writer has been replaced) 0.191 WS
2.942 MX
(with an object-code writer. This eliminates the step) 0.192 WS
72 404 moveto
(of running the assembler, which was previously a bottleneck in the code generation) 1.521 WS
4.270 MX
(process,) show
72 417 moveto
(and results in a) 0.174 WS
2.925 MX
(substantial reduction in compile time. If the Cross_Cg.Asm_Listing switch is set) 0.175 WS
72 430 moveto
(to True,) 2.631 WS
5.380 MX
(a listing file is generated by running the assembly-code writer in addition to the) 2.630 WS
72 443 moveto
(object-code writer.) show
72 480 moveto
12 /Palatino-Bold SelectFont
(3.1.3. More Efficient Use of Compiler Streams) show
72 504 moveto
11 /Palatino-Roman SelectFont
(Invocations of the CDF back ends have always been serialized; that is, each compiler stream) 0.144 WS
2.895 MX
(can) show
72 517 moveto
(only handle) 1.712 WS
4.461 MX
(a single compilation at a time. This is still true, but it is now the case for main) 1.711 WS
72 530 moveto
(programs that the serialization lock is relinquished as soon as the linker is) 0.380 WS
3.131 MX
(invoked. This means) 0.381 WS
72 543 moveto
(that the compilation stream on which a main program is being) 2.428 WS
5.177 MX
(coded is freed for another) 2.427 WS
72 556 moveto
(compilation as soon as the linker is invoked, rather than after it completes.) show
72 593 moveto
12 /Palatino-Bold SelectFont
(3.1.4. Address Clause Support) show
72 617 moveto
11 /Palatino-Roman SelectFont
(Support for address clauses on objects has been improved:) show
72 635 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(The address need not be determinable at compile time if the object is an array or record.) show
72 653 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Addresses clauses may now be used on) 0.425 WS
3.176 MX
(arrays and records whose size is not determinable) 0.426 WS
96 666 moveto
(at compile time.) show
72 684 moveto
(The address given in) 2.627 WS
5.376 MX
(the address clause must be determinable at compile time unless the) 2.626 WS
72 697 moveto
(specified object is an array or record, in) 0.430 WS
3.181 MX
(which case the address may be dynamic. An address is) 0.431 WS
72 710 moveto
(considered to be determinable at compile time only if it) 4.640 WS
7.389 MX
(takes the form of a call to) 4.639 WS
72 723 moveto
(System.To_Address with a compile-time determinable argument.) show
72 756 moveto
10 /Palatino-Roman SelectFont
(8) show
308.731 MX
(October 1992 ) show
17 /AvantGarde-Book SelectFont
( RATIONAL) show
EndPage
%%Page: 9 11
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
390.180 MX
(Rev7_2_2 Release) show
72 72 moveto
11 /Palatino-Roman SelectFont
(An object may not have both pragma Import_Object and an address clause.) show
72 90 moveto
(An address clause with a static address will cause the object) 1.628 WS
4.379 MX
(to be addressed using absolute) 1.629 WS
72 103 moveto
(addressing. Pragma Import_Object will cause the object) 1.287 WS
4.036 MX
(to be addressed A5-relative, with the) 1.286 WS
72 116 moveto
(linker resolving the external symbolic name to get the offset.) show
72 134 moveto
(An object having an) 3.133 WS
5.884 MX
(address clause is NOT subject to default initialization unless this is) 3.134 WS
72 147 moveto
(explicitly requested using pragma Initialize. Pragma Initialize has the following format:) show
72 171 moveto
10 /Courier-Bold SelectFont
(pragma INITIALIZE\050simple_name\051;) show
72 195 moveto
11 /Palatino-Roman SelectFont
(This pragma causes) 0.224 WS
2.973 MX
(the imported or address-claused object denoted by simple_name to become) 0.223 WS
72 208 moveto
(subject to default initialization.) show
72 226 moveto
(The parameter to pragma Initialize, simple_name, must denote a variable declared) 0.188 WS
2.939 MX
(earlier in the) 0.189 WS
72 239 moveto
(same declarative part. The variable must be an array or record and must) 0.158 WS
2.907 MX
(have an address clause) 0.157 WS
72 252 moveto
(or pragma Import_Object applied to it) 1.654 WS
4.405 MX
(before the occurrence of pragma Initialize. The object) 1.655 WS
72 265 moveto
(must not have an explicit initial value.) show
72 302 moveto
12 /Palatino-Bold SelectFont
(3.1.5. <Elab_Order_Listing> file) show
72 326 moveto
11 /Palatino-Roman SelectFont
(If the Cross_Cg.Elab_Order_Listing switch is set to True,) 1.749 WS
4.498 MX
(the Os2000 CDF now generates an) 1.748 WS
72 339 moveto
(<Elab_Order_Listing> file when a main program body is coded. This file consists) 0.319 WS
3.070 MX
(of a list of the) 0.320 WS
72 352 moveto
(fully qualified) 0.308 WS
3.057 MX
(names of the units in the closure of the main program, listed in the order of their) 0.307 WS
72 365 moveto
(elaboration. The file also includes comments indicating how a unit came to be included in the) 0.950 WS
72 378 moveto
(closure. The format of this file is suitable for use as an indirect file in a) 1.796 WS
4.545 MX
(naming expression,) 1.795 WS
72 391 moveto
(although names of any units out of code views will not be resolvable.) show
72 409 moveto
(When the main program is demoted to installed, the <Elab_Order_Listing> file is destroyed.) show
72 446 moveto
12 /Palatino-Bold SelectFont
(3.1.6. Object-Module Converter) show
72 470 moveto
11 /Palatino-Roman SelectFont
(The object-module converter is now run automatically as part of) 2.734 WS
5.485 MX
(coding a main program,) 2.735 WS
72 483 moveto
(generating an <Os2000> file. When a main program is demoted from coded to installed,) 1.630 WS
4.379 MX
(the) show
72 496 moveto
(<Os2000> file is automatically deleted.) show
72 514 moveto
(Since the <Os2000> file is now automatically generated, the) 0.370 WS
3.121 MX
(compiler no longer creates a <Exe>) 0.371 WS
72 527 moveto
(file by default. An <Exe>) 0.942 WS
3.691 MX
(file can be created by setting the Cross_Cg.Produce_Full_Exe switch) 0.941 WS
72 540 moveto
(to true.) show
72 578 moveto
13 /Palatino-Bold SelectFont
(3.2. Improvements in Generated Code) show
72 602 moveto
11 /Palatino-Roman SelectFont
(Compiler code generation has been improved in the following areas \050among others\051:) show
72 620 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(The propagation of constraint information has been improved. This improves) 4.922 WS
7.673 MX
(the) show
96 633 moveto
(elimination of unnecessary overflow and constraint checks.) show
72 651 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(To reduce overall register costs, the allocation of) 3.811 WS
6.560 MX
(common subexpressions has been) 3.810 WS
96 664 moveto
(integrated with that of other objects.) show
72 682 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(The allocation of volatile) 3.232 WS
5.983 MX
(registers has been improved. This increases the number of) 3.233 WS
96 695 moveto
(opportunities for stack frame elimination when the debugging level is PARTIAL or NONE.) show
72 713 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Object preferencing has been improved, reducing the number of move instructions.) show
72 756 moveto
17 /AvantGarde-Book SelectFont
(RATIONAL) show
10 /Palatino-Roman SelectFont
( October 1992) show
310.940 MX
(9) show
EndPage
%%Page: 10 12
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
(Rational Cross-Development Facility:) show
72 48 moveto
(M68020/OS-2000 Release Information) show
72 84 moveto
11 /Palatino-Roman SelectFont
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Processing of case statements by the optimizer has been much improved.) 1.483 WS
4.232 MX
(The optimizer) 1.482 WS
96 97 moveto
(chooses from a number of) 4.424 WS
7.175 MX
(different techniques to implement each case statement,) 4.425 WS
96 110 moveto
(depending on factors such as its size and) 0.254 WS
3.003 MX
(density. Different techniques are combined when) 0.253 WS
96 123 moveto
(appropriate, for example to) 1.263 WS
4.014 MX
(handle a large, generally sparse case statement having small) 1.264 WS
96 136 moveto
(regions of high density.) show
72 154 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Constant folding has been expanded. In particular, constant) 3.076 WS
5.825 MX
(folding of floating point) 3.075 WS
96 167 moveto
(expressions has been improved.) show
72 205 moveto
13 /Palatino-Bold SelectFont
(3.3. Shared-Code Generics) show
72 229 moveto
11 /Palatino-Roman SelectFont
(Users may request that all instantiations of a given generic share the same general) 0.326 WS
3.077 MX
(code, that all) 0.327 WS
72 242 moveto
(instantiations of a given generic have their own custom code, or that all instantiations by) 0.007 WS
2.756 MX
(default) show
72 255 moveto
(share the same code but that specified instantiations) 0.993 WS
3.744 MX
(have their own code. Two new pragmas,) 0.994 WS
72 268 moveto
(Generic_Policy and Instance_Policy,) 2.301 WS
5.050 MX
(are used to specify the manner in which code is to be) 2.300 WS
72 281 moveto
(generated for generics.) show
72 318 moveto
12 /Palatino-Bold SelectFont
(3.3.1. Pragma Generic_Policy) show
72 342 moveto
10 /Courier-Bold SelectFont
(pragma GENERIC_POLICY \050[GENERIC_UNIT =>] simple_name,) show
72 354 moveto
( [CODE =>] REPLICATED | SHARED\051) show
72 378 moveto
11 /Palatino-Roman SelectFont
(The simple name must denote a generic package or subprogram.) show
72 396 moveto
(The pragma and the declaration) 0.398 WS
3.149 MX
(of the named generic must occur immediately within the same) 0.399 WS
72 409 moveto
(declarative part or package specification; the) 0.331 WS
3.080 MX
(generic declaration must occur before the pragma.) 0.330 WS
72 422 moveto
(Only one Generic_Policy pragma may be applied to a generic.) show
72 440 moveto
(The pragma specifies how code should be) 1.825 WS
4.576 MX
(generated for the generic. If the Shared option is) 1.826 WS
72 453 moveto
(selected, code will be generated) 0.241 WS
2.990 MX
(for the generic itself; this code will be used for all instantiations) 0.240 WS
72 466 moveto
(of the generic \050except as noted below\051. If the Replicated option is selected, code will) 1.864 WS
4.615 MX
(not be) 1.865 WS
72 479 moveto
(generated for the generic, but rather for each instantiation of) 0.044 WS
2.793 MX
(the generic. The replicated code for) 0.043 WS
72 492 moveto
(an instantiation will be smaller and faster than the shared code for the corresponding generic.) show
72 510 moveto
(Demoting the body) 0.262 WS
3.013 MX
(of a replicated generic to installed causes all instantiations of that generic to) 0.263 WS
72 523 moveto
(also be demoted to installed, whereas demoting the) 0.886 WS
3.635 MX
(body of a shared generic to installed does) 0.885 WS
72 536 moveto
(not cause demotion of any instantiations \050except those that) 2.234 WS
4.985 MX
(were explicitly made replicated) 2.235 WS
72 549 moveto
(using pragma Instance_Policy\051.) show
72 567 moveto
(If pragma Generic_Policy is) 0.267 WS
3.016 MX
(not specified, the compiler decides between Shared and Replicated.) 0.266 WS
72 580 moveto
(At present, the default is always Replicated.) show
72 598 moveto
(Replicated generics are not permitted in spec views) 1.300 WS
4.051 MX
(\050therefore, a generic in a spec view must) 1.301 WS
72 611 moveto
(also have) 0.818 WS
3.567 MX
(a generic policy pragma specifying that the code is to be shared\051. The generic policy) 0.817 WS
72 624 moveto
(must be the same for corresponding generics in a load view and spec view. This) 0.180 WS
2.931 MX
(is currently not) 0.181 WS
72 637 moveto
(enforced, so care should be taken to ensure that all generics which appear) 1.219 WS
3.968 MX
(in a spec view are) 1.218 WS
72 650 moveto
(implemented as shared-code generics.) show
72 668 moveto
(To simplify the rules for spec/load view compatibility, and because) 3.643 WS
6.394 MX
(complete control is) 3.644 WS
72 681 moveto
(afforded by) 2.690 WS
5.439 MX
(the pragmas defined here, pragma Optimize does) 2.689 WS
11 /Palatino-Italic SelectFont
( not) 2.689 WS
11 /Palatino-Roman SelectFont
( play a role in selecting) 2.689 WS
72 694 moveto
(between shared and replicated code.) show
72 756 moveto
10 /Palatino-Roman SelectFont
(10) show
303.731 MX
(October 1992 ) show
17 /AvantGarde-Book SelectFont
( RATIONAL) show
EndPage
%%Page: 11 13
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
390.180 MX
(Rev7_2_2 Release) show
72 73 moveto
12 /Palatino-Bold SelectFont
(3.3.2. Pragma Instance_Policy) show
72 97 moveto
11 /Palatino-Roman SelectFont
(When a policy of shared has been selected for a generic, the user may still wish) 1.876 WS
4.627 MX
(for certain) 1.877 WS
72 110 moveto
(instantiations to have replicated) 0.901 WS
3.650 MX
(code for performance reasons. Pragma Instance_Policy allows) 0.900 WS
72 123 moveto
(this to be specified for a particular instantiation.) show
72 147 moveto
10 /Courier-Bold SelectFont
(pragma INSTANCE_POLICY \050[INSTANTIATION =>] simple_name,) show
72 159 moveto
( [CODE =>] REPLICATED\051) show
72 183 moveto
11 /Palatino-Roman SelectFont
(The simple name must denote an instantiation of a generic \050which may) 1.961 WS
4.712 MX
(be either shared or) 1.962 WS
72 196 moveto
(replicated\051.) show
72 214 moveto
(The pragma and the declaration of) 0.595 WS
3.344 MX
(the named instantiation must occur immediately within the) 0.594 WS
72 227 moveto
(same declarative part or package specification; the instantiation must occur) 0.640 WS
3.391 MX
(before the pragma.) 0.641 WS
72 240 moveto
(If the simple_name names several overloaded) 4.533 WS
7.282 MX
(subprogram instantiations in the current) 4.532 WS
72 253 moveto
(declarative part or package specification,) 4.255 WS
7.006 MX
(the pragma applies to all of them. Only one) 4.256 WS
72 266 moveto
(Instance_Policy pragma may be applied to a single instantiation.) show
72 284 moveto
(The pragma is ignored if the instantiation refers to a generic in a spec view.) show
72 321 moveto
12 /Palatino-Bold SelectFont
(3.3.3. Shared-Code Generic Features) show
72 345 moveto
11 /Palatino-Roman SelectFont
(The following subset of shared-code generic features is supported in this release:) show
72 363 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal floating point types) show
72 381 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal private and limited private types) show
72 399 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal access types) show
72 417 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal subprograms) show
72 435 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal objects of mode IN) show
72 453 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal arrays) show
72 471 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal discrete and integer types) show
72 489 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal scalar objects of mode IN OUT) show
72 507 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal nondiscriminated record objects of mode IN OUT) show
72 525 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal array objects of mode IN OUT) show
72 543 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Generics \050shared or replicated\051 nested immediately within shared generic packages) show
72 561 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Subunits, and subunits of subunits) show
72 579 moveto
(A Generic_Policy pragma with a policy of Shared will) 0.710 WS
3.459 MX
(be rejected of the generic has any of the) 0.709 WS
72 592 moveto
(following formal parameters:) show
72 610 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal fixed point types) show
72 628 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(Formal discriminated private and limited private types) show
72 646 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(IN OUT discriminated objects) show
72 664 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(IN OUT formal private or limited private objects) show
72 682 moveto
(Exceptions declared in shared) 1.932 WS
4.683 MX
(generics are not handled strictly correctly. The Ada language) 1.933 WS
72 695 moveto
(requires that such exceptions be) 0.722 WS
3.471 MX
(replicated for each instantiation \050as happens naturally when a) 0.721 WS
72 708 moveto
(macro-expansion technique is used\051; at the present time, this does not occur for shared generics.) show
72 756 moveto
17 /AvantGarde-Book SelectFont
(RATIONAL) show
10 /Palatino-Roman SelectFont
( October 1992) show
305.940 MX
(11) show
EndPage
%%Page: 12 14
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
(Rational Cross-Development Facility:) show
72 48 moveto
(M68020/OS-2000 Release Information) show
72 84 moveto
11 /Palatino-Roman SelectFont
(There is a temporary restriction) 0.399 WS
3.150 MX
(on the use of bodiless library unit generic packages. Use of this) 0.400 WS
72 97 moveto
(construct will result in an error at code generation time.) show
72 115 moveto
(The temporary restriction concerning the declaration of task types and objects in shared) 0.278 WS
3.027 MX
(generic) show
72 128 moveto
(package specs and bodies has been removed; such declarations will now be correctly processed.) show
72 165 moveto
12 /Palatino-Bold SelectFont
(3.3.4. Guidelines for Using Shared Code Generics) show
72 189 moveto
11 /Palatino-Roman SelectFont
(This section discusses the performance impact of shared code generics and) 3.864 WS
6.615 MX
(offers some) 3.865 WS
72 202 moveto
(suggestions on when to use them and how to optimize performance) 1.592 WS
4.341 MX
(when they are used. In) 1.591 WS
72 215 moveto
(general, shared) 0.892 WS
3.643 MX
(code generics will be less time efficient than replicated generics, but will often) 0.893 WS
72 228 moveto
(be more space efficient as well as permitting) 0.339 WS
3.088 MX
(the spec of the generic to be placed in a spec view.) 0.338 WS
72 241 moveto
(The code) 1.087 WS
3.838 MX
(is less efficient because code is generated to handle all the parameters with which a) 1.088 WS
72 254 moveto
(generic can be instantiated, rather than only the code necessary for the specific) 2.269 WS
5.018 MX
(parameters) show
72 267 moveto
(which are available at the instantiation site \050where code) 1.430 WS
4.181 MX
(for replicated generics is generated\051.) 1.431 WS
72 280 moveto
(Shared generics must also manage the state of a generic package \050i.e., objects declared in) 1.426 WS
4.175 MX
(the) show
72 293 moveto
(package\051. This is always less efficient, since it requires an) 3.256 WS
6.007 MX
(extra level of indirection, and) 3.257 WS
72 306 moveto
(sometimes more than one.) 0.361 WS
3.110 MX
(In general, shared code generics will be more space efficient because) 0.360 WS
72 319 moveto
(code will only be generated once rather than at each of the instatiation sites, but only) 0.082 WS
2.833 MX
(if there are) 0.083 WS
72 332 moveto
(several instantiations of the) 0.161 WS
2.910 MX
(generic \050it is always more efficient to use replicated generics if there) 0.160 WS
72 345 moveto
(is only one instantiation\051.) show
72 363 moveto
(It is also possible that a shared code generic will allocate more heap or stack than the) 1.691 WS
4.442 MX
(same) show
72 376 moveto
(generic replicated. This occurs when) 1.908 WS
4.657 MX
(the shared generic needs to allocate space but has less) 1.907 WS
72 389 moveto
(information about how much space to allocate than it would if it) 0.630 WS
3.381 MX
(were replicated. For instance,) 0.631 WS
72 402 moveto
(suppose a generic has a formal in object which is used as a bound in) 0.715 WS
3.464 MX
(an array. If the generic is) 0.714 WS
72 415 moveto
(replicated, the) 1.298 WS
4.049 MX
(compiler may be aware of the value that has been give to the object, in which) 1.299 WS
72 428 moveto
(case it will) 1.854 WS
4.603 MX
(allocate the array statically. If the generic is shared, however, the array must be) 1.853 WS
72 441 moveto
(allocated dynamically, since the compiler) 1.020 WS
3.771 MX
(must generate code without knowing the bounds of) 1.021 WS
72 454 moveto
(the array. Whether more space will be) 0.091 WS
2.840 MX
(used because of a given generic depends heavily on what) 0.090 WS
72 467 moveto
(kinds of generic parameters it takes, so here is a type by type list of some of the effects.) show
72 485 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
11 /Palatino-Bold SelectFont
19.434 MX
(Formal Floating Point Types) show
96 498 moveto
11 /Palatino-Roman SelectFont
(All simple objects of a formal floating point type will cause more stack) 3.048 WS
5.799 MX
(space to be) 3.049 WS
96 511 moveto
(allocated, since the compiler allocates enough space to store) 0.836 WS
3.585 MX
(a double-word value. Arrays) 0.835 WS
96 524 moveto
(of formal floats will be only as long as is needed, but they will) 1.446 WS
4.197 MX
(be dynamic in all cases,) 1.447 WS
96 537 moveto
(since the size of the element cannot be known at compile time.) show
72 555 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
11 /Palatino-Bold SelectFont
19.434 MX
(Formal Subprograms) show
96 568 moveto
11 /Palatino-Roman SelectFont
(All formal subprograms are) 1.779 WS
4.528 MX
(implemented by passing a compiler generated subprogram) 1.778 WS
96 581 moveto
(which does any needed type conversions and then calls the) 0.403 WS
3.154 MX
(actual subprogram. They have) 0.404 WS
96 594 moveto
(little effect on) 1.232 WS
3.981 MX
(the stack or heap used, although they do cause an extra stack frame to be) 1.231 WS
96 607 moveto
(allocated.) show
72 625 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
11 /Palatino-Bold SelectFont
19.434 MX
(Formal Access Types) show
96 638 moveto
11 /Palatino-Roman SelectFont
(No extra space is allocated for an object of a formal) 1.428 WS
4.179 MX
(access type, but extra master layers) 1.429 WS
96 651 moveto
(may be created in) 1.406 WS
4.155 MX
(some cases where we are unable to tell whether the access type is an) 1.405 WS
96 664 moveto
(access to a task type.) show
72 682 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
11 /Palatino-Bold SelectFont
19.434 MX
(Formal Objects of Mode IN) show
96 695 moveto
11 /Palatino-Roman SelectFont
(Formal IN objects have no significant effect on the amount of space allocated.) show
72 756 moveto
10 /Palatino-Roman SelectFont
(12) show
303.731 MX
(October 1992 ) show
17 /AvantGarde-Book SelectFont
( RATIONAL) show
EndPage
%%Page: 13 15
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
390.180 MX
(Rev7_2_2 Release) show
72 72 moveto
11 /Palatino-Roman SelectFont
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
11 /Palatino-Bold SelectFont
19.434 MX
(Formal Arrays) show
96 85 moveto
11 /Palatino-Roman SelectFont
(Formal arrays cause little difference in) 1.763 WS
4.514 MX
(the amount of space allocated on either heap or) 1.764 WS
96 98 moveto
(stack.) show
72 116 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
11 /Palatino-Bold SelectFont
19.434 MX
(Formal Private Types) show
96 129 moveto
11 /Palatino-Roman SelectFont
(Formal private) 0.686 WS
3.435 MX
(types can incur much more overhead with shared code generics than with) 0.685 WS
96 142 moveto
(replicated generics. This is because the compiler must now allow for) 0.771 WS
3.522 MX
(the possiblity of any) 0.772 WS
96 155 moveto
(type. In general,) 1.718 WS
4.467 MX
(objects of a formal private type will be allocated a single word on the) 1.717 WS
96 168 moveto
(stack. If the actual type is a simple type \050i.e. a scalar\051, the word will) 1.124 WS
3.875 MX
(contain the value of) 1.125 WS
96 181 moveto
(object. If the actual type) 1.022 WS
3.771 MX
(is more complex, the word will point to another object allocated) 1.021 WS
96 194 moveto
(dynamically which will contain) 0.015 WS
2.766 MX
(the actual data, or possibly more pointers to other dynamic) 0.016 WS
96 207 moveto
(objects. With this scheme, little more space is allocated that is necessary, but space which) 0.897 WS
96 220 moveto
(would have been on) 1.205 WS
3.956 MX
(the stack in a replicated generic will now be allocated dynamically,) 1.206 WS
96 233 moveto
(sometimes on the heap. Also,) 0.131 WS
2.880 MX
(since pointers must be dereferenced \050in some cases a chain of) 0.130 WS
96 246 moveto
(pointers must be followed\051, operations) 2.375 WS
5.126 MX
(on formal private types will be slower than in) 2.376 WS
96 259 moveto
(replicated generics. In) 2.217 WS
4.966 MX
(many cases, runtime calls are made to perform operations \050e.g.,) 2.216 WS
96 272 moveto
(equality tests, assignment, function return of formal privates, etc\051.) show
72 290 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
11 /Palatino-Bold SelectFont
19.434 MX
(Formal Discrete and Integer Types) show
96 303 moveto
11 /Palatino-Roman SelectFont
(The only effect of formal discrete and integer types is that some arrays) 1.398 WS
4.149 MX
(which would be) 1.399 WS
96 316 moveto
(allocated statically will become dynamic.) show
72 334 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
11 /Palatino-Bold SelectFont
19.434 MX
(Formal Scalars of Mode IN OUT) show
96 347 moveto
11 /Palatino-Roman SelectFont
(In out objects cause little change in the amount of space allocated.) show
72 365 moveto
(With all types an effort has been made to ensure that shared code generics behave in the same) 0.692 WS
72 378 moveto
(way as the same generic does when replicated, including raising the same errors at) 1.307 WS
4.058 MX
(the same) 1.308 WS
72 391 moveto
(locations. The only exception to) 2.292 WS
5.041 MX
(this is that in some cases with formal floating point types) 2.291 WS
72 404 moveto
(Constraint_Error will be raised where Numeric_Error was previously raised.) show
72 442 moveto
13 /Palatino-Bold SelectFont
(3.4. Code Views and the Predefined Subsystem) show
72 466 moveto
11 /Palatino-Roman SelectFont
(Prior to this release, code views could not be transferred between machines because the link) 1.527 WS
72 479 moveto
(names of the predefined units) 0.851 WS
3.600 MX
(\050e.g. system\051 were not the same on different machines. This has) 0.850 WS
72 492 moveto
(been corrected by placing the predefined units in) 0.660 WS
3.411 MX
(a subsystem view called !Targets.Predefined.) 0.661 WS
72 505 moveto
(As a result,) show
11 /Palatino-Italic SelectFont
( new models are required which point to the new predefined units.) show
72 523 moveto
11 /Palatino-Roman SelectFont
(This new organization permits worlds which were compiled) 0.340 WS
3.089 MX
(with previous compilers to coexist) 0.339 WS
72 536 moveto
(on the same machine with worlds compiled with the new compiler. Note, however, that) 3.099 WS
72 549 moveto
(modules produced by one version of the compiler cannot be linked) 0.498 WS
3.247 MX
(with modules produced by) 0.497 WS
72 562 moveto
(another version.) show
72 580 moveto
11 /Palatino-Italic SelectFont
(Existing subsystem views) 2.429 WS
5.180 MX
(which are to be compiled with the new compiler must have their models) 2.430 WS
72 593 moveto
(replaced.) show
11 /Palatino-Roman SelectFont
( The links in other) 0.267 WS
3.016 MX
(worlds must be changed to point to the new predefined units. A tool) 0.266 WS
72 606 moveto
(is provided with this release which will demote units in) 2.354 WS
5.105 MX
(existing worlds and update these) 2.355 WS
72 619 moveto
(worlds for the Rev7_2 compiler - see the installation notes for more details.) show
72 756 moveto
17 /AvantGarde-Book SelectFont
(RATIONAL) show
10 /Palatino-Roman SelectFont
( October 1992) show
305.940 MX
(13) show
EndPage
%%Page: 14 16
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
(Rational Cross-Development Facility:) show
72 48 moveto
(M68020/OS-2000 Release Information) show
72 86 moveto
13 /Palatino-Bold SelectFont
(3.5. Other New Features) show
72 123 moveto
12 /Palatino-Bold SelectFont
(3.5.1. Pragma Assert) show
72 147 moveto
10 /Courier-Bold SelectFont
(pragma ASSERT\050[Predicate =>] boolean_expression) show
72 159 moveto
( [, [Class =>] integer_expression]\051;) show
72 183 moveto
11 /Palatino-Roman SelectFont
(When the pragma) 2.182 WS
4.931 MX
(is encountered, boolean_expression is evaluated. If the resulting value is) 2.181 WS
72 196 moveto
(FALSE, the exception System.Assertion_Error is raised;) 0.691 WS
3.442 MX
(otherwise, no further action is taken. If) 0.692 WS
72 209 moveto
(System.Assertion_Error is not defined, Program_Error is raised instead.) show
72 227 moveto
(The integer_expression is ignored; for the moment, it is allowed only for compatibility) 0.424 WS
3.173 MX
(with the) 0.423 WS
72 240 moveto
(R1000 Ada code generator.) show
72 258 moveto
(This pragma may appear wherever a statement or declaration would be legal.) show
72 295 moveto
12 /Palatino-Bold SelectFont
(3.5.2. Pragma Collection_Policy) show
72 319 moveto
11 /Palatino-Roman SelectFont
(The pragma Collection_Policy can be used to) 1.937 WS
4.688 MX
(customize storage management. The complete) 1.938 WS
72 332 moveto
(syntax for this pragma is:) show
72 356 moveto
10 /Courier-Bold SelectFont
(pragma COLLECTION_POLICY \050Access_Type => access_type,) show
72 368 moveto
( Initial_Size => integer_expression) show
72 380 moveto
( [, Extensible => boolean_expression]) show
72 392 moveto
( [, Extension_Size => integer_expression]\051;) show
72 416 moveto
11 /Palatino-Roman SelectFont
(This pragma must appear in the same declarative region as the access type that it applies) 0.014 WS
2.763 MX
(to, and) 0.013 WS
72 429 moveto
(the access type's full type) 0.444 WS
3.195 MX
(declaration must occur before the pragma. This implies that, in order) 0.445 WS
72 442 moveto
(to use a) 1.095 WS
3.844 MX
(private type for the Access_Type argument, the pragma must be given in the private) 1.094 WS
72 455 moveto
(part after the complete access-type declaration. At most one such pragma is allowed for) 0.284 WS
3.035 MX
(a given) 0.285 WS
72 468 moveto
(access type.) show
72 486 moveto
(The Collection_Policy pragma is ignored when:) show
72 504 moveto
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(a `Storage_Size clause is given for the access type; in this case, the Storage_Size takes) 2.404 WS
96 517 moveto
(precedence. This is because a statement of the form:) show
96 541 moveto
10 /Courier-Bold SelectFont
(for X'Storage_Size use size;) show
96 565 moveto
11 /Palatino-Roman SelectFont
(is equivalent to:) show
96 589 moveto
10 /Courier-Bold SelectFont
(pragma Collection_Policy \050Access_Type => X,) show
96 601 moveto
( Initial_Size => size,) show
96 613 moveto
( Extensible => False\051;) show
72 637 moveto
11 /Palatino-Roman SelectFont
0 -1.100 rmoveto
6 /ZapfDingbats SelectFont
(n) show
11 /Palatino-Roman SelectFont
0 1.100 rmoveto
19.434 MX
(the pragma follows a forcing occurrence of the access type \050LRM 13.1.6\051.) show
72 655 moveto
(Access_Type and Initial_Size are required. Extensible and Extension_Size are optional.) 2.966 WS
5.717 MX
(All) show
72 668 moveto
(arguments must) 3.534 WS
6.283 MX
(be specified using named association, as shown in all examples in this) 3.533 WS
72 681 moveto
(pragma's discussion.) show
72 756 moveto
10 /Palatino-Roman SelectFont
(14) show
303.731 MX
(October 1992 ) show
17 /AvantGarde-Book SelectFont
( RATIONAL) show
EndPage
%%Page: 15 17
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
390.180 MX
(Rev7_2_2 Release) show
72 72 moveto
11 /Palatino-Roman SelectFont
(If Extensible is) 0.348 WS
3.099 MX
(False, the collection is nonextensible. If Extensible is True, which is the default if) 0.349 WS
72 85 moveto
(not specified, then the collection will be extended by a) 0.636 WS
3.385 MX
(certain number of storage units when it) 0.635 WS
72 98 moveto
(fills up, if it is possible to do so. The number of storage units in the extension size is) 0.598 WS
3.349 MX
(chosen by) 0.599 WS
72 111 moveto
(the runtime system unless the Extension_Size is specified.) show
72 129 moveto
(Extension_Size allows the user to) 0.566 WS
3.315 MX
(specify the number of storage units to be allocated whenever) 0.565 WS
72 142 moveto
(the collection needs to be extended. This parameter is ignored if Extensible is False.) show
72 160 moveto
(Initial_Size gives the size) 2.326 WS
5.077 MX
(in storage units of the collection created at the point of the type) 2.327 WS
72 173 moveto
(declaration. If no pragma Collection_Policy is used,) 4.362 WS
7.111 MX
(the initial size of the collection is) 4.361 WS
72 186 moveto
(determined by the runtime system. A nonpositive) 1.540 WS
4.291 MX
(Initial_Value on a nonextensible collection) 1.541 WS
72 199 moveto
(raises the Storage_Error exception in the situations described below. Currently,) show
72 223 moveto
10 /Courier-Bold SelectFont
(for X'Storage_Size use 0;) show
72 247 moveto
11 /Palatino-Roman SelectFont
(means that no collection should be created for X.) 2.071 WS
4.820 MX
(The same effect is achieved with pragma) 2.070 WS
72 260 moveto
(Collection_Policy by giving:) show
72 284 moveto
10 /Courier-Bold SelectFont
(pragma Collection_Policy \050Access_Type => X,) show
72 296 moveto
( Initial_Size => 0,) show
72 308 moveto
( Extensible => False\051;) show
72 332 moveto
11 /Palatino-Roman SelectFont
(In both of the) 3.162 WS
5.913 MX
(above cases, an attempt to use an allocator will result in a Storage_Error) 3.163 WS
72 345 moveto
(exception. However, you could also say:) show
72 369 moveto
10 /Courier-Bold SelectFont
(pragma Collection_Policy \050Access_Type => x,) show
72 381 moveto
( Initial_Size => 0,) show
72 393 moveto
( Extensible => True,) show
72 405 moveto
( Extension_Size => 100\051;) show
72 429 moveto
11 /Palatino-Roman SelectFont
(which means "do not create a collection until an allocation is performed.") 2.947 WS
5.696 MX
(When the first) 2.946 WS
72 442 moveto
(allocator is executed, the collection is created with the extension size.) show
72 479 moveto
12 /Palatino-Bold SelectFont
(3.5.3. New Attribute: 'Homogeneous) show
72 503 moveto
11 /Palatino-Roman SelectFont
(Applicable to an access type; yields a Boolean value.) 3.470 WS
6.221 MX
(The value returned is False if the) 3.471 WS
72 516 moveto
(designated type given in) 2.638 WS
5.387 MX
(the access type declaration is an unconstrained array type or an) 2.637 WS
72 529 moveto
(unconstrained discriminated record type, and True otherwise.) show
72 547 moveto
(If the attribute is) 0.653 WS
3.404 MX
(True, then all objects in the collection must have the same size. The converse,) 0.654 WS
72 560 moveto
(however, is not true.) show
72 578 moveto
(Note that the attribute is a) 0.386 WS
3.135 MX
(property of the type, not of the subtype. Thus, for any access type T,) 0.385 WS
72 591 moveto
(T'Homogeneous = T'Base'Homogeneous.) show
72 609 moveto
(For example:) show
72 633 moveto
10 /Courier-Bold SelectFont
( type T1 is access String;) show
72 645 moveto
( type T2 is new T1 \0501 .. 10\051; -- T2'Homogeneous = False) show
72 669 moveto
11 /Palatino-Roman SelectFont
(At the implementation level, the attribute indicates) 0.153 WS
2.904 MX
(whether or not constraint information needs) 0.154 WS
72 682 moveto
(to be stored with allocated objects.) show
72 756 moveto
17 /AvantGarde-Book SelectFont
(RATIONAL) show
10 /Palatino-Roman SelectFont
( October 1992) show
305.940 MX
(15) show
EndPage
%%Page: 16 18
BeginPage
792 false PositionPage
72 36 moveto
10 /Palatino-Roman SelectFont
(Rational Cross-Development Facility:) show
72 48 moveto
(M68020/OS-2000 Release Information) show
72 85 moveto
12 /Palatino-Bold SelectFont
(3.5.4. Object Writer) show
72 109 moveto
11 /Palatino-Roman SelectFont
(The compiler now generates an object file directly. Previously, the) 2.978 WS
5.727 MX
(compiler generated an) 2.977 WS
72 122 moveto
(assembly file and invoked the assembler to obtain an) 1.633 WS
4.384 MX
(object file. This change results in code) 1.634 WS
72 135 moveto
(generation times that are approximately 25%) 0.396 WS
3.145 MX
(faster. As a consequence,) 0.395 WS
11 /Palatino-Italic SelectFont
( the Cross_Cg.Asm_Source) 0.395 WS
72 148 moveto
(switch is now obsolete) show
11 /Palatino-Roman SelectFont
(. To obtain an assembly listing, use the Cross_Cg.Listing switch.) show
72 185 moveto
12 /Palatino-Bold SelectFont
(3.5.5. Elaboration Checks) show
72 209 moveto
11 /Palatino-Roman SelectFont
(The CDF) 5.331 WS
8.082 MX
(now supports the Suppress_Elaboration_Objects switch, which eliminates all) 5.332 WS
72 222 moveto
(elaboration objects and the code to test and set them. When this new switch is) 1.029 WS
3.778 MX
(set to true, the) 1.028 WS
72 235 moveto
(compiler behaves as if the user had inserted:) show
72 259 moveto
10 /Courier-Bold SelectFont
( pragma Suppress \050Elaboration_Check, On => Snaggle\051;) show
72 283 moveto
11 /Palatino-Roman SelectFont
(for each subprogram 'snaggle' in each compilation unit in the) 0.281 WS
3.032 MX
(library. This significantly reduces) 0.282 WS
72 296 moveto
(the amount of initialization code in Ada units.) show
72 314 moveto
(Because the prelinker guarantees that spec/load) 3.415 WS
6.164 MX
(subsystems are elaborated in layers, the) 3.414 WS
72 327 moveto
(compiler never generates elaboration checks on cross-subsystem) 1.031 WS
3.782 MX
(calls to subprograms that are) 1.032 WS
72 340 moveto
(imported via a spec view. Due to this, it is not necessary) 0.362 WS
3.111 MX
(that the Suppress_Elaboration_Objects) 0.361 WS
72 353 moveto
(switch have the same value in corresponding spec and load views.) show
72 371 moveto
(Elaboration objects for generics are NOT affected by the Suppress_Elaboration_Objects switch.) show
72 756 moveto
10 /Palatino-Roman SelectFont
(16) show
303.731 MX
(October 1992 ) show
17 /AvantGarde-Book SelectFont
( RATIONAL) show
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