• file
• revisions
• annotate
• diff
• comparison
• raw

src/cpu/x86/vm/relocInfo_x86.cpp@f3de1255b035 (annotated)

src/cpu/x86/vm/relocInfo_x86.cpp

Wed, 07 May 2008 08:06:46 -0700

author

rasbold

date

Wed, 07 May 2008 08:06:46 -0700

changeset 580

f3de1255b035

parent 435

a61af66fc99e

child 599

c436414a719e

permissions

-rw-r--r--

6603011: RFE: Optimize long division
Summary: Transform long division by constant into multiply
Reviewed-by: never, kvn

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