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src/share/vm/code/vmreg.hpp@d1605aabd0a1 (annotated)

src/share/vm/code/vmreg.hpp

Wed, 02 Jul 2008 12:55:16 -0700

author

xdono

date

Wed, 02 Jul 2008 12:55:16 -0700

changeset 631

d1605aabd0a1

parent 535

c7c777385a15

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6719955: Update copyright year
Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell

duke@435	1	/*
xdono@631	2	* Copyright 1998-2008 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	//------------------------------VMReg------------------------------------------
duke@435	26	// The VM uses 'unwarped' stack slots; the compiler uses 'warped' stack slots.
duke@435	27	// Register numbers below VMRegImpl::stack0 are the same for both. Register
duke@435	28	// numbers above stack0 are either warped (in the compiler) or unwarped
duke@435	29	// (in the VM). Unwarped numbers represent stack indices, offsets from
duke@435	30	// the current stack pointer. Warped numbers are required during compilation
duke@435	31	// when we do not yet know how big the frame will be.
duke@435	32
duke@435	33	class VMRegImpl;
duke@435	34	typedef VMRegImpl* VMReg;
duke@435	35
duke@435	36	class VMRegImpl {
duke@435	37	// friend class OopMap;
duke@435	38	friend class VMStructs;
duke@435	39	friend class OptoReg;
duke@435	40	// friend class Location;
duke@435	41	private:
duke@435	42	enum {
duke@435	43	BAD = -1
duke@435	44	};
duke@435	45
duke@435	46
duke@435	47
duke@435	48	static VMReg stack0;
duke@435	49	// Names for registers
duke@435	50	static const char *regName[];
duke@435	51	static const int register_count;
duke@435	52
duke@435	53
duke@435	54	public:
duke@435	55
duke@435	56	static VMReg as_VMReg(int val, bool bad_ok = false) { assert(val > BAD || bad_ok, "invalid"); return (VMReg) (intptr_t) val; }
duke@435	57
duke@435	58	const char* name() {
duke@435	59	if (is_reg()) {
duke@435	60	return regName[value()];
duke@435	61	} else if (!is_valid()) {
duke@435	62	return "BAD";
duke@435	63	} else {
duke@435	64	// shouldn't really be called with stack
duke@435	65	return "STACKED REG";
duke@435	66	}
duke@435	67	}
duke@435	68	static VMReg Bad() { return (VMReg) (intptr_t) BAD; }
kvn@460	69	bool is_valid() const { return ((intptr_t) this) != BAD; }
kvn@460	70	bool is_stack() const { return (intptr_t) this >= (intptr_t) stack0; }
kvn@460	71	bool is_reg() const { return is_valid() && !is_stack(); }
duke@435	72
duke@435	73	// A concrete register is a value that returns true for is_reg() and is
duke@435	74	// also a register you could use in the assembler. On machines with
duke@435	75	// 64bit registers only one half of the VMReg (and OptoReg) is considered
duke@435	76	// concrete.
duke@435	77	bool is_concrete();
duke@435	78
duke@435	79	// VMRegs are 4 bytes wide on all platforms
duke@435	80	static const int stack_slot_size;
duke@435	81	static const int slots_per_word;
duke@435	82
duke@435	83
duke@435	84	// This really ought to check that the register is "real" in the sense that
duke@435	85	// we don't try and get the VMReg number of a physical register that doesn't
duke@435	86	// have an expressible part. That would be pd specific code
duke@435	87	VMReg next() {
duke@435	88	assert((is_reg() && value() < stack0->value() - 1) || is_stack(), "must be");
duke@435	89	return (VMReg)(intptr_t)(value() + 1);
duke@435	90	}
duke@435	91	VMReg prev() {
duke@435	92	assert((is_stack() && value() > stack0->value()) || (is_reg() && value() != 0), "must be");
duke@435	93	return (VMReg)(intptr_t)(value() - 1);
duke@435	94	}
duke@435	95
duke@435	96
duke@435	97	intptr_t value() const {return (intptr_t) this; }
duke@435	98
jrose@535	99	void print_on(outputStream* st) const;
kvn@460	100	void print() const { print_on(tty); }
duke@435	101
duke@435	102	// bias a stack slot.
duke@435	103	// Typically used to adjust a virtual frame slots by amounts that are offset by
duke@435	104	// amounts that are part of the native abi. The VMReg must be a stack slot
duke@435	105	// and the result must be also.
duke@435	106
duke@435	107	VMReg bias(int offset) {
duke@435	108	assert(is_stack(), "must be");
duke@435	109	// VMReg res = VMRegImpl::as_VMReg(value() + offset);
duke@435	110	VMReg res = stack2reg(reg2stack() + offset);
duke@435	111	assert(res->is_stack(), "must be");
duke@435	112	return res;
duke@435	113	}
duke@435	114
duke@435	115	// Convert register numbers to stack slots and vice versa
duke@435	116	static VMReg stack2reg( int idx ) {
duke@435	117	return (VMReg) (intptr_t) (stack0->value() + idx);
duke@435	118	}
duke@435	119
duke@435	120	uintptr_t reg2stack() {
duke@435	121	assert( is_stack(), "Not a stack-based register" );
duke@435	122	return value() - stack0->value();
duke@435	123	}
duke@435	124
duke@435	125	static void set_regName();
duke@435	126
duke@435	127	#include "incls/_vmreg_pd.hpp.incl"
duke@435	128
duke@435	129	};
duke@435	130
duke@435	131	//---------------------------VMRegPair-------------------------------------------
duke@435	132	// Pairs of 32-bit registers for arguments.
duke@435	133	// SharedRuntime::java_calling_convention will overwrite the structs with
duke@435	134	// the calling convention's registers. VMRegImpl::Bad is returned for any
duke@435	135	// unused 32-bit register. This happens for the unused high half of Int
duke@435	136	// arguments, or for 32-bit pointers or for longs in the 32-bit sparc build
duke@435	137	// (which are passed to natives in low 32-bits of e.g. O0/O1 and the high
duke@435	138	// 32-bits of O0/O1 are set to VMRegImpl::Bad). Longs in one register & doubles
duke@435	139	// always return a high and a low register, as do 64-bit pointers.
duke@435	140	//
duke@435	141	class VMRegPair {
duke@435	142	private:
duke@435	143	VMReg _second;
duke@435	144	VMReg _first;
duke@435	145	public:
duke@435	146	void set_bad ( ) { _second=VMRegImpl::Bad(); _first=VMRegImpl::Bad(); }
duke@435	147	void set1 ( VMReg v ) { _second=VMRegImpl::Bad(); _first=v; }
duke@435	148	void set2 ( VMReg v ) { _second=v->next(); _first=v; }
duke@435	149	void set_pair( VMReg second, VMReg first ) { _second= second; _first= first; }
duke@435	150	void set_ptr ( VMReg ptr ) {
duke@435	151	#ifdef _LP64
duke@435	152	_second = ptr->next();
duke@435	153	#else
duke@435	154	_second = VMRegImpl::Bad();
duke@435	155	#endif
duke@435	156	_first = ptr;
duke@435	157	}
duke@435	158	// Return true if single register, even if the pair is really just adjacent stack slots
jrose@535	159	bool is_single_reg() const {
duke@435	160	return (_first->is_valid()) && (_first->value() + 1 == _second->value());
duke@435	161	}
duke@435	162
duke@435	163	// Return true if single stack based "register" where the slot alignment matches input alignment
jrose@535	164	bool is_adjacent_on_stack(int alignment) const {
duke@435	165	return (_first->is_stack() && (_first->value() + 1 == _second->value()) && ((_first->value() & (alignment-1)) == 0));
duke@435	166	}
duke@435	167
duke@435	168	// Return true if single stack based "register" where the slot alignment matches input alignment
jrose@535	169	bool is_adjacent_aligned_on_stack(int alignment) const {
duke@435	170	return (_first->is_stack() && (_first->value() + 1 == _second->value()) && ((_first->value() & (alignment-1)) == 0));
duke@435	171	}
duke@435	172
duke@435	173	// Return true if single register but adjacent stack slots do not count
jrose@535	174	bool is_single_phys_reg() const {
duke@435	175	return (_first->is_reg() && (_first->value() + 1 == _second->value()));
duke@435	176	}
duke@435	177
duke@435	178	VMReg second() const { return _second; }
duke@435	179	VMReg first() const { return _first; }
duke@435	180	VMRegPair(VMReg s, VMReg f) { _second = s; _first = f; }
duke@435	181	VMRegPair(VMReg f) { _second = VMRegImpl::Bad(); _first = f; }
duke@435	182	VMRegPair() { _second = VMRegImpl::Bad(); _first = VMRegImpl::Bad(); }
duke@435	183	};