hotspot/src/share/vm/code/location.hpp
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rev 611 : Merge
@@ -1,10 +1,10 @@
#ifdef USE_PRAGMA_IDENT_HDR
#pragma ident "@(#)location.hpp 1.47 07/05/05 17:05:21 JVM"
#endif
/*
- * 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
@@ -29,57 +29,58 @@
// (such as integer or floating point register or a stack-held
// variable). Used when generating debug-information for nmethods.
//
// 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;
public:
enum Where {
on_stack,
in_register
};
enum Type {
+ invalid, // Invalid location
normal, // Ints, floats, double halves
oop, // Oop (please GC me!)
int_in_long, // Integer held in long register
lng, // Long held in one register
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_) {
set(where_, type_, offset_);
assert( where () == where_ , "" );
assert( type () == type_ , "" );
assert( offset() == offset_, "" );
}
inline void set(Where where_, Type type_, unsigned offset_) {
- _value = (uint16_t) ((where_ << WHERE_SHIFT) |
+ _value = (juint) ((where_ << WHERE_SHIFT) |
(type_ << TYPE_SHIFT) |
((offset_ << OFFSET_SHIFT) & OFFSET_MASK));
}
public:
@@ -87,11 +88,11 @@
// Stack location Factory. Offset is 4-byte aligned; remove low bits
static Location new_stk_loc( Type t, int offset ) { return Location(on_stack,t,offset>>LogBytesPerInt); }
// 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);}
Type type() const { return (Type) ((_value & TYPE_MASK) >> TYPE_SHIFT); }
unsigned offset() const { return (unsigned) ((_value & OFFSET_MASK) >> OFFSET_SHIFT); }