[Ada] Fix 32/64bit mistake on SYSTEM_INFO component in s-win32

The dwActiveProcessorMask field in a SYSTEM_INFO structure on Windows
should be DWORD_PTR, an integer the size of a pointer.

In s-win32, it is currently declared as DWORD. This happens to work on
32bit hosts and is wrong on 64bit hosts, causing mishaps in accesses to
this component and all the following ones.

The proposed correction adds a definition for DWORD_PTR and uses it for
dwActiveProcessorMask in System.Win32.SYSTEM_INFO.

2019-09-18  Olivier Hainque  <hainque@adacore.com>

gcc/ada/

	* libgnat/s-win32.ads (DWORD_PTR): New type, pointer size
	unsigned int.
	(SYSTEM_INFO): Use it for dwActiveProcessorMask.

gcc/testsuite/

	* gnat.dg/system_info1.adb: New testcase.

From-SVN: r275843

4 files changed, 44 insertions, 10 deletions

diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 77089cc..02628c9 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,9 @@
+2019-09-18  Olivier Hainque  <hainque@adacore.com>
+
+	* libgnat/s-win32.ads (DWORD_PTR): New type, pointer size
+	unsigned int.
+	(SYSTEM_INFO): Use it for dwActiveProcessorMask.
+
 2019-09-18  Arnaud Charlet  <charlet@adacore.com>
 
 	* doc/gnat_rm/implementation_defined_pragmas.rst: Improve doc on
diff --git a/gcc/ada/libgnat/s-win32.ads b/gcc/ada/libgnat/s-win32.ads
index ab832cd..853cef0 100644
--- a/gcc/ada/libgnat/s-win32.ads
+++ b/gcc/ada/libgnat/s-win32.ads
@@ -57,15 +57,16 @@ package System.Win32 is
    INVALID_HANDLE_VALUE : constant HANDLE := -1;
    INVALID_FILE_SIZE    : constant := 16#FFFFFFFF#;
 
-   type ULONG  is new Interfaces.C.unsigned_long;
-   type DWORD  is new Interfaces.C.unsigned_long;
-   type WORD   is new Interfaces.C.unsigned_short;
-   type BYTE   is new Interfaces.C.unsigned_char;
-   type LONG   is new Interfaces.C.long;
-   type CHAR   is new Interfaces.C.char;
-   type SIZE_T is new Interfaces.C.size_t;
-
-   type BOOL   is new Interfaces.C.int;
+   type ULONG     is new Interfaces.C.unsigned_long;
+   type DWORD     is new Interfaces.C.unsigned_long;
+   type WORD      is new Interfaces.C.unsigned_short;
+   type BYTE      is new Interfaces.C.unsigned_char;
+   type LONG      is new Interfaces.C.long;
+   type CHAR      is new Interfaces.C.char;
+   type SIZE_T    is new Interfaces.C.size_t;
+   type DWORD_PTR is mod 2 ** Standard'Address_Size;
+
+   type BOOL      is new Interfaces.C.int;
    for BOOL'Size use Interfaces.C.int'Size;
 
    type Bits1  is range 0 .. 2 ** 1 - 1;
@@ -265,7 +266,7 @@ package System.Win32 is
       dwPageSize                  : DWORD;
       lpMinimumApplicationAddress : PVOID;
       lpMaximumApplicationAddress : PVOID;
-      dwActiveProcessorMask       : DWORD;
+      dwActiveProcessorMask       : DWORD_PTR;
       dwNumberOfProcessors        : DWORD;
       dwProcessorType             : DWORD;
       dwAllocationGranularity     : DWORD;
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 5e143b57..1db62e2 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2019-09-18  Olivier Hainque  <hainque@adacore.com>
+
+	* gnat.dg/system_info1.adb: New testcase.
+
 2019-09-18  Bob Duff  <duff@adacore.com>
 
 	* gnat.dg/containers1.adb, gnat.dg/containers1.ads: New
diff --git a/gcc/testsuite/gnat.dg/system_info1.adb b/gcc/testsuite/gnat.dg/system_info1.adb
new file mode 100644
index 0000000..493a18e
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/system_info1.adb
@@ -0,0 +1,23 @@
+--  { dg-do run }
+
+with System.Multiprocessors;
+with System.Task_Info;
+
+procedure System_Info1 is
+   Ncpus : constant System.Multiprocessors.CPU :=
+     System.Multiprocessors.Number_Of_CPUS;
+   Nprocs : constant Integer :=
+     System.Task_Info.Number_Of_Processors;
+
+   use type System.Multiprocessors.CPU;
+begin
+   if Nprocs <= 0 or else Nprocs > 1024 then
+      raise Program_Error;
+   end if;
+   if Ncpus <= 0 or else Ncpus > 1024 then
+      raise Program_Error;
+   end if;
+   if Nprocs /= Integer (Ncpus) then
+      raise Program_Error;
+   end if;
+end;
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