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src/cpu/x86/vm/relocInfo_x86.cpp@c436414a719e (annotated)

src/cpu/x86/vm/relocInfo_x86.cpp

Wed, 21 May 2008 13:46:23 -0700

author

kvn

date

Wed, 21 May 2008 13:46:23 -0700

changeset 599

c436414a719e

parent 435

a61af66fc99e

child 631

d1605aabd0a1

permissions

-rw-r--r--

6703890: Compressed Oops: add LoadNKlass node to generate narrow oops (32-bits) compare instructions
Summary: Add LoadNKlass and CMoveN nodes, use CmpN and ConN nodes to generate narrow oops compare instructions.
Reviewed-by: never, rasbold

duke@435	1	/*
duke@435	2	* Copyright 1998-2005 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	# include "incls/_precompiled.incl"
duke@435	26	# include "incls/_relocInfo_x86.cpp.incl"
duke@435	27
duke@435	28
duke@435	29	void Relocation::pd_set_data_value(address x, intptr_t o) {
duke@435	30	#ifdef AMD64
duke@435	31	x += o;
duke@435	32	typedef Assembler::WhichOperand WhichOperand;
kvn@599	33	WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm64, call32, narrow oop
duke@435	34	assert(which == Assembler::disp32_operand ||
kvn@599	35	which == Assembler::narrow_oop_operand ||
duke@435	36	which == Assembler::imm64_operand, "format unpacks ok");
duke@435	37	if (which == Assembler::imm64_operand) {
duke@435	38	*pd_address_in_code() = x;
kvn@599	39	} else if (which == Assembler::narrow_oop_operand) {
kvn@599	40	address disp = Assembler::locate_operand(addr(), which);
kvn@599	41	*(int32_t*) disp = oopDesc::encode_heap_oop((oop)x);
duke@435	42	} else {
duke@435	43	// Note: Use runtime_call_type relocations for call32_operand.
duke@435	44	address ip = addr();
duke@435	45	address disp = Assembler::locate_operand(ip, which);
duke@435	46	address next_ip = Assembler::locate_next_instruction(ip);
duke@435	47	*(int32_t*) disp = x - next_ip;
duke@435	48	}
duke@435	49	#else
duke@435	50	*pd_address_in_code() = x + o;
duke@435	51	#endif // AMD64
duke@435	52	}
duke@435	53
duke@435	54
duke@435	55	address Relocation::pd_call_destination(address orig_addr) {
duke@435	56	intptr_t adj = 0;
duke@435	57	if (orig_addr != NULL) {
duke@435	58	// We just moved this call instruction from orig_addr to addr().
duke@435	59	// This means its target will appear to have grown by addr() - orig_addr.
duke@435	60	adj = -( addr() - orig_addr );
duke@435	61	}
duke@435	62	NativeInstruction* ni = nativeInstruction_at(addr());
duke@435	63	if (ni->is_call()) {
duke@435	64	return nativeCall_at(addr())->destination() + adj;
duke@435	65	} else if (ni->is_jump()) {
duke@435	66	return nativeJump_at(addr())->jump_destination() + adj;
duke@435	67	} else if (ni->is_cond_jump()) {
duke@435	68	return nativeGeneralJump_at(addr())->jump_destination() + adj;
duke@435	69	} else if (ni->is_mov_literal64()) {
duke@435	70	return (address) ((NativeMovConstReg*)ni)->data();
duke@435	71	} else {
duke@435	72	ShouldNotReachHere();
duke@435	73	return NULL;
duke@435	74	}
duke@435	75	}
duke@435	76
duke@435	77
duke@435	78	void Relocation::pd_set_call_destination(address x) {
duke@435	79	NativeInstruction* ni = nativeInstruction_at(addr());
duke@435	80	if (ni->is_call()) {
duke@435	81	nativeCall_at(addr())->set_destination(x);
duke@435	82	} else if (ni->is_jump()) {
duke@435	83	NativeJump* nj = nativeJump_at(addr());
duke@435	84	#ifdef AMD64
duke@435	85	if (nj->jump_destination() == (address) -1) {
duke@435	86	x = (address) -1; // retain jump to self
duke@435	87	}
duke@435	88	#endif // AMD64
duke@435	89	nj->set_jump_destination(x);
duke@435	90	} else if (ni->is_cond_jump()) {
duke@435	91	// %%%% kludge this, for now, until we get a jump_destination method
duke@435	92	address old_dest = nativeGeneralJump_at(addr())->jump_destination();
duke@435	93	address disp = Assembler::locate_operand(addr(), Assembler::call32_operand);
duke@435	94	*(jint*)disp += (x - old_dest);
duke@435	95	} else if (ni->is_mov_literal64()) {
duke@435	96	((NativeMovConstReg*)ni)->set_data((intptr_t)x);
duke@435	97	} else {
duke@435	98	ShouldNotReachHere();
duke@435	99	}
duke@435	100	}
duke@435	101
duke@435	102
duke@435	103	address* Relocation::pd_address_in_code() {
duke@435	104	// All embedded Intel addresses are stored in 32-bit words.
duke@435	105	// Since the addr points at the start of the instruction,
duke@435	106	// we must parse the instruction a bit to find the embedded word.
duke@435	107	assert(is_data(), "must be a DataRelocation");
duke@435	108	typedef Assembler::WhichOperand WhichOperand;
duke@435	109	WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm64/imm32
duke@435	110	#ifdef AMD64
duke@435	111	assert(which == Assembler::disp32_operand ||
duke@435	112	which == Assembler::call32_operand ||
duke@435	113	which == Assembler::imm64_operand, "format unpacks ok");
duke@435	114	if (which != Assembler::imm64_operand) {
duke@435	115	// The "address" in the code is a displacement can't return it as
duke@435	116	// and address* since it is really a jint*
duke@435	117	ShouldNotReachHere();
duke@435	118	return NULL;
duke@435	119	}
duke@435	120	#else
duke@435	121	assert(which == Assembler::disp32_operand || which == Assembler::imm32_operand, "format unpacks ok");
duke@435	122	#endif // AMD64
duke@435	123	return (address*) Assembler::locate_operand(addr(), which);
duke@435	124	}
duke@435	125
duke@435	126
duke@435	127	address Relocation::pd_get_address_from_code() {
duke@435	128	#ifdef AMD64
duke@435	129	// All embedded Intel addresses are stored in 32-bit words.
duke@435	130	// Since the addr points at the start of the instruction,
duke@435	131	// we must parse the instruction a bit to find the embedded word.
duke@435	132	assert(is_data(), "must be a DataRelocation");
duke@435	133	typedef Assembler::WhichOperand WhichOperand;
duke@435	134	WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm64/imm32
duke@435	135	assert(which == Assembler::disp32_operand ||
duke@435	136	which == Assembler::call32_operand ||
duke@435	137	which == Assembler::imm64_operand, "format unpacks ok");
duke@435	138	if (which != Assembler::imm64_operand) {
duke@435	139	address ip = addr();
duke@435	140	address disp = Assembler::locate_operand(ip, which);
duke@435	141	address next_ip = Assembler::locate_next_instruction(ip);
duke@435	142	address a = next_ip + *(int32_t*) disp;
duke@435	143	return a;
duke@435	144	}
duke@435	145	#endif // AMD64
duke@435	146	return *pd_address_in_code();
duke@435	147	}
duke@435	148
duke@435	149	int Relocation::pd_breakpoint_size() {
duke@435	150	// minimum breakpoint size, in short words
duke@435	151	return NativeIllegalInstruction::instruction_size / sizeof(short);
duke@435	152	}
duke@435	153
duke@435	154	void Relocation::pd_swap_in_breakpoint(address x, short* instrs, int instrlen) {
duke@435	155	Untested("pd_swap_in_breakpoint");
duke@435	156	if (instrs != NULL) {
duke@435	157	assert(instrlen * sizeof(short) == NativeIllegalInstruction::instruction_size, "enough instrlen in reloc. data");
duke@435	158	for (int i = 0; i < instrlen; i++) {
duke@435	159	instrs[i] = ((short*)x)[i];
duke@435	160	}
duke@435	161	}
duke@435	162	NativeIllegalInstruction::insert(x);
duke@435	163	}
duke@435	164
duke@435	165
duke@435	166	void Relocation::pd_swap_out_breakpoint(address x, short* instrs, int instrlen) {
duke@435	167	Untested("pd_swap_out_breakpoint");
duke@435	168	assert(NativeIllegalInstruction::instruction_size == sizeof(short), "right address unit for update");
duke@435	169	NativeInstruction* ni = nativeInstruction_at(x);
duke@435	170	*(short*)ni->addr_at(0) = instrs[0];
duke@435	171	}