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yasm/modules/parsers/gas/gas-parser.c

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Preliminary GAS parser. Only a few instructions are supported at present. This work is being done under contract with a company that has requested to remain unnamed at the present time. * bc-int.h (yasm_effaddr): Add strong flag to indicate if the effective address is definitely an effective address; GAS does not use [] to designate effective addresses so it's otherwise impossible to tell the difference between "expr(,1)" and just "expr" (important for the relative jump instructions). * bytecode.h (yasm_ea_set_strong): New function to set the strong flag. * bytecode.c (yasm_ea_set_strong): Implementation. * x86bc.c (yasm_x86__ea_create_reg): Initialize strong flag. * arch.h (yasm_insn_operand): Add deref flag to indicate use of "*foo" in GAS syntax. * arch.c (yasm_operand_create_reg, yasm_operand_create_segreg) (yasm_operand_create_mem, yasm_operand_create_imm): Set deref flag to 0. * gas: GAS syntax lexer and parser. Not all directives are implemented yet (some will require additional core bytecodes). * elf-objfmt.c (elf_objfmt_section_switch): Add support for GAS-style section flags. * x86arch.h (yasm_arch_x86): Add parser setting. * x86arch.c (x86_create): Check for gas parser and initialize setting. * x86bc.c (yasm_x86__ea_create_expr): Transform val+RIP to val wrt RIP when using the GAS parser (this is how GAS interprets "expr(%rip)"). * x86id.re: Too many changes to enumerate in detail. Add new modifiers for GAS suffixes. Start using them in a couple instructions. Split check_id into subfunctions (still one entry point at present). (yasm_x86__finalize_insn): Support new modifiers, reverse operands, derefs. * yasm.c (main): Change all undef to extern when using GAS parser (this is default GAS behavior). svn path=/trunk/yasm/; revision=1239
19 years ago
/*
* GAS-compatible parser
*
* Copyright (C) 2005 Peter Johnson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of other contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <util.h>
/*@unused@*/ RCSID("$Id$");
#define YASM_LIB_INTERNAL
#include <libyasm.h>
#include "gas-parser.h"
static void
gas_parser_do_parse(yasm_object *object, yasm_preproc *pp, yasm_arch *a,
yasm_objfmt *of, FILE *f, const char *in_filename,
int save_input, yasm_section *def_sect)
{
yasm_parser_gas parser_gas;
parser_gas.object = object;
parser_gas.linemap = yasm_object_get_linemap(parser_gas.object);
parser_gas.symtab = yasm_object_get_symtab(parser_gas.object);
parser_gas.in = f;
parser_gas.locallabel_base = (char *)NULL;
parser_gas.locallabel_base_len = 0;
parser_gas.preproc = pp;
parser_gas.arch = a;
parser_gas.objfmt = of;
parser_gas.cur_section = def_sect;
parser_gas.prev_bc = yasm_section_bcs_first(def_sect);
parser_gas.save_input = save_input;
parser_gas.save_last = 0;
/* initialize scanner structure */
parser_gas.s.bot = NULL;
parser_gas.s.tok = NULL;
parser_gas.s.ptr = NULL;
parser_gas.s.cur = NULL;
parser_gas.s.pos = NULL;
parser_gas.s.lim = NULL;
parser_gas.s.top = NULL;
parser_gas.s.eof = NULL;
parser_gas.s.tchar = 0;
parser_gas.s.tline = 0;
parser_gas.s.cline = 1;
parser_gas.state = INITIAL;
Add support for single-level GAS .rept directive. Nested .rept's are not allowed at the moment. The implementation works mostly like a preproc; it copies source lines and replays them to the lexer. A new .line directive was added to fix up line numbers for errors and warnings. * gas-parser.h (yasm_parser_gas): Add rept structure storage. (gas_rept): New data structure for .rept state. (gas_rept_line): Data structure to store source lines within .rept block. * gas-parser.c: Initialize rept to NULL and check for unclosed rept. * gas-bison.y: Add support for .line, .rept, and .endr directives. The DIR_REPT handler just creates the rept structure, and the DIR_ENDR handler just errors (.endr without .rept). All the real work is done in the lexer. * gas-token.re (rept_input): Replays captured .rept block source lines back to fill(). (fill): Call rept_input() instead of yasm_preproc_input() if expanding a rept block. (gas_parser_lex): Capture source lines and store into rept data structures. Also added a whole bunch of testcases. svn path=/trunk/yasm/; revision=1306
19 years ago
parser_gas.rept = NULL;
Preliminary GAS parser. Only a few instructions are supported at present. This work is being done under contract with a company that has requested to remain unnamed at the present time. * bc-int.h (yasm_effaddr): Add strong flag to indicate if the effective address is definitely an effective address; GAS does not use [] to designate effective addresses so it's otherwise impossible to tell the difference between "expr(,1)" and just "expr" (important for the relative jump instructions). * bytecode.h (yasm_ea_set_strong): New function to set the strong flag. * bytecode.c (yasm_ea_set_strong): Implementation. * x86bc.c (yasm_x86__ea_create_reg): Initialize strong flag. * arch.h (yasm_insn_operand): Add deref flag to indicate use of "*foo" in GAS syntax. * arch.c (yasm_operand_create_reg, yasm_operand_create_segreg) (yasm_operand_create_mem, yasm_operand_create_imm): Set deref flag to 0. * gas: GAS syntax lexer and parser. Not all directives are implemented yet (some will require additional core bytecodes). * elf-objfmt.c (elf_objfmt_section_switch): Add support for GAS-style section flags. * x86arch.h (yasm_arch_x86): Add parser setting. * x86arch.c (x86_create): Check for gas parser and initialize setting. * x86bc.c (yasm_x86__ea_create_expr): Transform val+RIP to val wrt RIP when using the GAS parser (this is how GAS interprets "expr(%rip)"). * x86id.re: Too many changes to enumerate in detail. Add new modifiers for GAS suffixes. Start using them in a couple instructions. Split check_id into subfunctions (still one entry point at present). (yasm_x86__finalize_insn): Support new modifiers, reverse operands, derefs. * yasm.c (main): Change all undef to extern when using GAS parser (this is default GAS behavior). svn path=/trunk/yasm/; revision=1239
19 years ago
/* yacc debugging, needs YYDEBUG set in bison.y.in to work */
parser_gas.debug = 1;
gas_parser_parse(&parser_gas);
Add support for single-level GAS .rept directive. Nested .rept's are not allowed at the moment. The implementation works mostly like a preproc; it copies source lines and replays them to the lexer. A new .line directive was added to fix up line numbers for errors and warnings. * gas-parser.h (yasm_parser_gas): Add rept structure storage. (gas_rept): New data structure for .rept state. (gas_rept_line): Data structure to store source lines within .rept block. * gas-parser.c: Initialize rept to NULL and check for unclosed rept. * gas-bison.y: Add support for .line, .rept, and .endr directives. The DIR_REPT handler just creates the rept structure, and the DIR_ENDR handler just errors (.endr without .rept). All the real work is done in the lexer. * gas-token.re (rept_input): Replays captured .rept block source lines back to fill(). (fill): Call rept_input() instead of yasm_preproc_input() if expanding a rept block. (gas_parser_lex): Capture source lines and store into rept data structures. Also added a whole bunch of testcases. svn path=/trunk/yasm/; revision=1306
19 years ago
/* Check for ending inside a rept */
if (parser_gas.rept)
yasm__error(parser_gas.rept->startline,
N_("rept without matching endr"));
Preliminary GAS parser. Only a few instructions are supported at present. This work is being done under contract with a company that has requested to remain unnamed at the present time. * bc-int.h (yasm_effaddr): Add strong flag to indicate if the effective address is definitely an effective address; GAS does not use [] to designate effective addresses so it's otherwise impossible to tell the difference between "expr(,1)" and just "expr" (important for the relative jump instructions). * bytecode.h (yasm_ea_set_strong): New function to set the strong flag. * bytecode.c (yasm_ea_set_strong): Implementation. * x86bc.c (yasm_x86__ea_create_reg): Initialize strong flag. * arch.h (yasm_insn_operand): Add deref flag to indicate use of "*foo" in GAS syntax. * arch.c (yasm_operand_create_reg, yasm_operand_create_segreg) (yasm_operand_create_mem, yasm_operand_create_imm): Set deref flag to 0. * gas: GAS syntax lexer and parser. Not all directives are implemented yet (some will require additional core bytecodes). * elf-objfmt.c (elf_objfmt_section_switch): Add support for GAS-style section flags. * x86arch.h (yasm_arch_x86): Add parser setting. * x86arch.c (x86_create): Check for gas parser and initialize setting. * x86bc.c (yasm_x86__ea_create_expr): Transform val+RIP to val wrt RIP when using the GAS parser (this is how GAS interprets "expr(%rip)"). * x86id.re: Too many changes to enumerate in detail. Add new modifiers for GAS suffixes. Start using them in a couple instructions. Split check_id into subfunctions (still one entry point at present). (yasm_x86__finalize_insn): Support new modifiers, reverse operands, derefs. * yasm.c (main): Change all undef to extern when using GAS parser (this is default GAS behavior). svn path=/trunk/yasm/; revision=1239
19 years ago
gas_parser_cleanup(&parser_gas);
/* Free locallabel base if necessary */
if (parser_gas.locallabel_base)
yasm_xfree(parser_gas.locallabel_base);
}
/* Define valid preprocessors to use with this parser */
static const char *gas_parser_preproc_keywords[] = {
"raw",
NULL
};
/* Define parser structure -- see parser.h for details */
yasm_parser_module yasm_gas_LTX_parser = {
"GNU AS (GAS)-compatible parser",
"gas",
gas_parser_preproc_keywords,
"raw",
gas_parser_do_parse
};