--- a/hotspot/src/share/vm/code/location.hpp Wed Sep 10 14:29:32 2008 -0700
+++ b/hotspot/src/share/vm/code/location.hpp Wed Sep 10 18:23:32 2008 -0700
@@ -1,5 +1,5 @@
/*
- * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
+ * Copyright 1997-2008 Sun Microsystems, Inc. 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
@@ -28,10 +28,10 @@
//
// Encoding:
//
-// bits:
-// Where: [15]
-// Type: [14..12]
-// Offset: [11..0]
+// bits (use low bits for best compression):
+// Type: [3..0]
+// Where: [4]
+// Offset: [31..5]
class Location VALUE_OBJ_CLASS_SPEC {
friend class VMStructs;
@@ -42,6 +42,7 @@
};
enum Type {
+ invalid, // Invalid location
normal, // Ints, floats, double halves
oop, // Oop (please GC me!)
int_in_long, // Integer held in long register
@@ -49,21 +50,21 @@
float_in_dbl, // Float held in double register
dbl, // Double held in one register
addr, // JSR return address
- invalid // Invalid location
+ narrowoop // Narrow Oop (please GC me!)
};
private:
enum {
- OFFSET_MASK = (jchar) 0x0FFF,
- OFFSET_SHIFT = 0,
- TYPE_MASK = (jchar) 0x7000,
- TYPE_SHIFT = 12,
- WHERE_MASK = (jchar) 0x8000,
- WHERE_SHIFT = 15
+ TYPE_MASK = (juint) 0x0F,
+ TYPE_SHIFT = 0,
+ WHERE_MASK = (juint) 0x10,
+ WHERE_SHIFT = 4,
+ OFFSET_MASK = (juint) 0xFFFFFFE0,
+ OFFSET_SHIFT = 5
};
- uint16_t _value;
+ juint _value;
// Create a bit-packed Location
Location(Where where_, Type type_, unsigned offset_) {
@@ -74,9 +75,9 @@
}
inline void set(Where where_, Type type_, unsigned offset_) {
- _value = (uint16_t) ((where_ << WHERE_SHIFT) |
- (type_ << TYPE_SHIFT) |
- ((offset_ << OFFSET_SHIFT) & OFFSET_MASK));
+ _value = (juint) ((where_ << WHERE_SHIFT) |
+ (type_ << TYPE_SHIFT) |
+ ((offset_ << OFFSET_SHIFT) & OFFSET_MASK));
}
public:
@@ -86,7 +87,7 @@
// Register location Factory
static Location new_reg_loc( Type t, VMReg reg ) { return Location(in_register, t, reg->value()); }
// Default constructor
- Location() { set(on_stack,invalid,(unsigned) -1); }
+ Location() { set(on_stack,invalid,0); }
// Bit field accessors
Where where() const { return (Where) ((_value & WHERE_MASK) >> WHERE_SHIFT);}