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src/hotspot/share/utilities/globalDefinitions_xlc.hpp
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rev 53569 : 8218136: minor hotspot adjustments for xlclang++ from xlc16 on AIX
@@ -1,8 +1,8 @@
/*
* Copyright (c) 1998, 2019, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2012, 2017 SAP SE. All rights reserved.
+ * Copyright (c) 2012, 2019 SAP SE. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
@@ -49,55 +49,47 @@
#include <limits.h>
#include <errno.h>
#include <stdint.h>
+// __IBMCPP__ is not defined any more with xlclang++
+#ifdef __IBMCPP__
+#if __IBMCPP__ < 1200
+#error "xlc < 12 not supported"
+#endif
+#endif
+
+#ifndef _AIX
+#error "missing AIX-specific definition _AIX"
+#endif
+
// Use XLC compiler builtins instead of inline assembler
#define USE_XLC_BUILTINS
+
#ifdef USE_XLC_BUILTINS
#include <builtins.h>
- #if __IBMCPP__ < 1000
- // the funtion prototype for __dcbtst(void *) is missing in XLC V8.0
- // I could compile a little test, where I provided the prototype.
- // The generated code was correct there. This is the prototype:
- // extern "builtin" void __dcbtst (void *);
- // For now we don't make use of it when compiling with XLC V8.0
- #else
- // __IBMCPP__ >= 1000
- // XLC V10 provides the prototype for __dcbtst (void *);
- #define USE_XLC_PREFETCH_WRITE_BUILTIN
- #endif
+// XLC V10 and higher provide the prototype for __dcbtst (void *);
#endif // USE_XLC_BUILTINS
// NULL vs NULL_WORD:
-// On Linux NULL is defined as a special type '__null'. Assigning __null to
-// integer variable will cause gcc warning. Use NULL_WORD in places where a
-// pointer is stored as integer value. On some platforms, sizeof(intptr_t) >
-// sizeof(void*), so here we want something which is integer type, but has the
-// same size as a pointer.
-#ifdef __GNUC__
- #error XLC and __GNUC__?
-#else
- #define NULL_WORD NULL
-#endif
+// Some platform/tool-chain combinations can't assign NULL to an integer
+// type so we define NULL_WORD to use in those contexts. For xlc they are the same.
+#define NULL_WORD NULL
// AIX also needs a 64 bit NULL to work as a null address pointer.
// Most system includes on AIX would define it as an int 0 if not already defined with one
// exception: /usr/include/dirent.h will unconditionally redefine NULL to int 0 again.
// In this case you need to copy the following defines to a position after #include <dirent.h>
-// (see jmv_aix.h).
-#ifdef AIX
- #include <dirent.h>
- #ifdef _LP64
+#include <dirent.h>
+#ifdef _LP64
#undef NULL
#define NULL 0L
- #else
+#else
#ifndef NULL
#define NULL 0
#endif
- #endif
-#endif // AIX
+#endif
// Compiler-specific primitive types
// All defs of int (uint16_6 etc) are defined in AIX' /usr/include/stdint.h
// Additional Java basic types
@@ -106,25 +98,18 @@
typedef uint16_t jushort;
typedef uint32_t juint;
typedef uint64_t julong;
// checking for nanness
-#ifdef AIX
inline int g_isnan(float f) { return isnan(f); }
inline int g_isnan(double f) { return isnan(f); }
-#else
-#error "missing platform-specific definition here"
-#endif
// Checking for finiteness
-
inline int g_isfinite(jfloat f) { return finite(f); }
inline int g_isfinite(jdouble f) { return finite(f); }
-
// Wide characters
-
inline int wcslen(const jchar* x) { return wcslen((const wchar_t*)x); }
// Formatting.
#ifdef _LP64
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