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debug.adb: Document use of -gnatd.a and -gnatd.I

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2007-10-15  Tristan Gingold  <gingold@adacore.com>

	* debug.adb: Document use of -gnatd.a and -gnatd.I

	* layout.adb: On OpenVMS -gnatd.a disables alignment optimization.

From-SVN: r129321
This commit is contained in:
Tristan Gingold 2007-10-15 15:54:21 +02:00 committed by Arnaud Charlet
parent 250db54966
commit a8ee464537
2 changed files with 22 additions and 6 deletions
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14
gcc/ada/debug.adb
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@ -93,7 +93,7 @@ package body Debug is
-- dY Enable configurable run-time mode
-- dZ Generate listing showing the contents of the dispatch tables
-- d.a
-- d.a Disable OpenVMS alignment optimization on types
-- d.b
-- d.c
-- d.d
@ -128,7 +128,7 @@ package body Debug is
-- d.F
-- d.G
-- d.H
-- d.I
-- d.I Inspector mode
-- d.J
-- d.K
-- d.L
@ -495,6 +495,12 @@ package body Debug is
-- - In case of abstract subprograms the text "is abstract" is
-- added at the end of the line.
-- d.a Disable OpenVMS alignment optimization on types. On OpenVMS,
-- record types whose size is odd "in between" (e.g. 17 bits) are
-- over-aligned to the next power of 2 (until 8 bytes). This over
-- alignment improve generated code and is more consistent with
-- what Dec Ada does.
-- d.f Suppress folding of static expressions. This of course results
-- in seriously non-conforming behavior, but is useful sometimes
-- when tracking down handling of complex expressions.
@ -533,6 +539,10 @@ package body Debug is
-- fully compiled and analyzed, they just get eliminated from the
-- code generation step.
-- d.I Inspector mode. Relevant for VM_Target /= None. Try to generate
-- byte code, even in case of unsupported construct, for the sake
-- of static analysis tools.
-- d1 Error messages have node numbers where possible. Normally error
-- messages have only source locations. This option is useful when
-- debugging errors caused by expanded code, where the source location

14
gcc/ada/layout.adb
View File

@ -819,6 +819,7 @@ package body Layout is
OK : Boolean;
LLo : Uint;
LHi : Uint;
pragma Warnings (Off, LHi);
begin
Set_Parent (Len, E);
@ -1908,7 +1909,9 @@ package body Layout is
First_Discr : Entity_Id;
Last_Discr : Entity_Id;
Esiz : SO_Ref;
RM_Siz : SO_Ref;
RM_Siz : SO_Ref;
pragma Warnings (Off, SO_Ref);
RM_Siz_Expr : Node_Id := Empty;
-- Expression for the evolving RM_Siz value. This is typically a
@ -2789,10 +2792,13 @@ package body Layout is
-- On VMS, also reset for odd "in between" sizes, e.g. a 17-bit
-- record is given an alignment of 4. This is more consistent with
-- what DEC Ada does.
elsif OpenVMS_On_Target and then Siz > System_Storage_Unit then
-- what DEC Ada does (-gnatd.a turns this off which can be used to
-- examine the value of this special transformation).
elsif OpenVMS_On_Target
and then not Debug_Flag_Dot_A
and then Siz > System_Storage_Unit
then
if Siz <= 2 * System_Storage_Unit then
Align := 2;
elsif Siz <= 4 * System_Storage_Unit then