1143 lines
30 KiB
Plaintext
1143 lines
30 KiB
Plaintext
/* yyscript.y -- linker script grammar for gold. */
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/* Copyright (C) 2006-2015 Free Software Foundation, Inc.
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Written by Ian Lance Taylor <iant@google.com>.
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This file is part of gold.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/* This is a bison grammar to parse a subset of the original GNU ld
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linker script language. */
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%{
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#include "config.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "script-c.h"
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%}
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/* We need to use a pure parser because we might be multi-threaded.
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We pass some arguments through the parser to the lexer. */
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%pure-parser
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%parse-param {void* closure}
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%lex-param {void* closure}
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/* Since we require bison anyhow, we take advantage of it. */
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%error-verbose
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/* The values associated with tokens. */
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%union {
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/* A string. */
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struct Parser_string string;
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/* A number. */
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uint64_t integer;
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/* An expression. */
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Expression_ptr expr;
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/* An output section header. */
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struct Parser_output_section_header output_section_header;
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/* An output section trailer. */
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struct Parser_output_section_trailer output_section_trailer;
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/* A section constraint. */
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enum Section_constraint constraint;
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/* A complete input section specification. */
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struct Input_section_spec input_section_spec;
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/* A list of wildcard specifications, with exclusions. */
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struct Wildcard_sections wildcard_sections;
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/* A single wildcard specification. */
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struct Wildcard_section wildcard_section;
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/* A list of strings. */
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String_list_ptr string_list;
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/* Information for a program header. */
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struct Phdr_info phdr_info;
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/* Used for version scripts and within VERSION {}. */
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struct Version_dependency_list* deplist;
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struct Version_expression_list* versyms;
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struct Version_tree* versnode;
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enum Script_section_type section_type;
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}
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/* Operators, including a precedence table for expressions. */
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%right PLUSEQ MINUSEQ MULTEQ DIVEQ '=' LSHIFTEQ RSHIFTEQ ANDEQ OREQ
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%right '?' ':'
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%left OROR
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%left ANDAND
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%left '|'
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%left '^'
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%left '&'
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%left EQ NE
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%left '<' '>' LE GE
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%left LSHIFT RSHIFT
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%left '+' '-'
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%left '*' '/' '%'
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/* A fake operator used to indicate unary operator precedence. */
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%right UNARY
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/* Constants. */
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%token <string> STRING
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%token <string> QUOTED_STRING
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%token <integer> INTEGER
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/* Keywords. This list is taken from ldgram.y and ldlex.l in the old
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GNU linker, with the keywords which only appear in MRI mode
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removed. Not all these keywords are actually used in this grammar.
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In most cases the keyword is recognized as the token name in upper
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case. The comments indicate where this is not the case. */
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%token ABSOLUTE
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%token ADDR
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%token ALIGN_K /* ALIGN */
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%token ALIGNOF
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%token ASSERT_K /* ASSERT */
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%token AS_NEEDED
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%token AT
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%token BIND
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%token BLOCK
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%token BYTE
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%token CONSTANT
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%token CONSTRUCTORS
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%token COPY
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%token CREATE_OBJECT_SYMBOLS
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%token DATA_SEGMENT_ALIGN
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%token DATA_SEGMENT_END
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%token DATA_SEGMENT_RELRO_END
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%token DEFINED
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%token DSECT
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%token ENTRY
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%token EXCLUDE_FILE
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%token EXTERN
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%token FILL
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%token FLOAT
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%token FORCE_COMMON_ALLOCATION
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%token GLOBAL /* global */
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%token GROUP
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%token HLL
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%token INCLUDE
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%token INHIBIT_COMMON_ALLOCATION
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%token INFO
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%token INPUT
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%token KEEP
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%token LEN
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%token LENGTH /* LENGTH, l, len */
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%token LOADADDR
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%token LOCAL /* local */
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%token LONG
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%token MAP
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%token MAX_K /* MAX */
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%token MEMORY
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%token MIN_K /* MIN */
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%token NEXT
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%token NOCROSSREFS
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%token NOFLOAT
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%token NOLOAD
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%token ONLY_IF_RO
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%token ONLY_IF_RW
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%token ORG
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%token ORIGIN /* ORIGIN, o, org */
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%token OUTPUT
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%token OUTPUT_ARCH
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%token OUTPUT_FORMAT
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%token OVERLAY
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%token PHDRS
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%token PROVIDE
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%token PROVIDE_HIDDEN
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%token QUAD
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%token SEARCH_DIR
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%token SECTIONS
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%token SEGMENT_START
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%token SHORT
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%token SIZEOF
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%token SIZEOF_HEADERS /* SIZEOF_HEADERS, sizeof_headers */
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%token SORT_BY_ALIGNMENT
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%token SORT_BY_NAME
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%token SPECIAL
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%token SQUAD
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%token STARTUP
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%token SUBALIGN
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%token SYSLIB
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%token TARGET_K /* TARGET */
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%token TRUNCATE
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%token VERSIONK /* VERSION */
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/* Keywords, part 2. These are keywords that are unique to gold,
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and not present in the old GNU linker. As before, unless the
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comments say otherwise, the keyword is recognized as the token
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name in upper case. */
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%token OPTION
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/* Special tokens used to tell the grammar what type of tokens we are
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parsing. The token stream always begins with one of these tokens.
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We do this because version scripts can appear embedded within
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linker scripts, and because --defsym uses the expression
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parser. */
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%token PARSING_LINKER_SCRIPT
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%token PARSING_VERSION_SCRIPT
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%token PARSING_DEFSYM
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%token PARSING_DYNAMIC_LIST
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%token PARSING_SECTIONS_BLOCK
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%token PARSING_SECTION_COMMANDS
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%token PARSING_MEMORY_DEF
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/* Non-terminal types, where needed. */
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%type <expr> parse_exp exp
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%type <expr> opt_at opt_align opt_subalign opt_fill
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%type <output_section_header> section_header opt_address_and_section_type
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%type <section_type> section_type
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%type <output_section_trailer> section_trailer
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%type <constraint> opt_constraint
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%type <string_list> opt_phdr
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%type <integer> data_length
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%type <input_section_spec> input_section_no_keep
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%type <wildcard_sections> wildcard_sections
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%type <wildcard_section> wildcard_file wildcard_section
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%type <string_list> exclude_names
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%type <string> wildcard_name
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%type <integer> phdr_type memory_attr
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%type <phdr_info> phdr_info
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%type <versyms> vers_defns
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%type <versnode> vers_tag
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%type <deplist> verdep
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%type <string> string
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%%
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/* Read the special token to see what to read next. */
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top:
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PARSING_LINKER_SCRIPT linker_script
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| PARSING_VERSION_SCRIPT version_script
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| PARSING_DEFSYM defsym_expr
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| PARSING_DYNAMIC_LIST dynamic_list_expr
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| PARSING_SECTIONS_BLOCK sections_block
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| PARSING_SECTION_COMMANDS section_cmds
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| PARSING_MEMORY_DEF memory_defs
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;
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/* A file contains a list of commands. */
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linker_script:
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linker_script file_cmd
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| /* empty */
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;
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/* A command which may appear at top level of a linker script. */
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file_cmd:
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EXTERN '(' extern_name_list ')'
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| FORCE_COMMON_ALLOCATION
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{ script_set_common_allocation(closure, 1); }
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| GROUP
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{ script_start_group(closure); }
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'(' input_list ')'
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{ script_end_group(closure); }
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| INHIBIT_COMMON_ALLOCATION
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{ script_set_common_allocation(closure, 0); }
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| INPUT '(' input_list ')'
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| MEMORY '{' memory_defs '}'
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| OPTION '(' string ')'
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{ script_parse_option(closure, $3.value, $3.length); }
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| OUTPUT_FORMAT '(' string ')'
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{
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if (!script_check_output_format(closure, $3.value, $3.length,
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NULL, 0, NULL, 0))
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YYABORT;
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}
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| OUTPUT_FORMAT '(' string ',' string ',' string ')'
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{
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if (!script_check_output_format(closure, $3.value, $3.length,
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$5.value, $5.length,
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$7.value, $7.length))
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YYABORT;
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}
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| PHDRS '{' phdrs_defs '}'
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| SEARCH_DIR '(' string ')'
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{ script_add_search_dir(closure, $3.value, $3.length); }
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| SECTIONS '{'
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{ script_start_sections(closure); }
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sections_block '}'
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{ script_finish_sections(closure); }
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| TARGET_K '(' string ')'
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{ script_set_target(closure, $3.value, $3.length); }
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| VERSIONK '{'
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{ script_push_lex_into_version_mode(closure); }
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version_script '}'
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{ script_pop_lex_mode(closure); }
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| ENTRY '(' string ')'
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{ script_set_entry(closure, $3.value, $3.length); }
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| assignment end
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| ASSERT_K '(' parse_exp ',' string ')'
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{ script_add_assertion(closure, $3, $5.value, $5.length); }
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| INCLUDE string
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{ script_include_directive(PARSING_LINKER_SCRIPT, closure,
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$2.value, $2.length); }
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| ignore_cmd
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| ';'
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;
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/* Top level commands which we ignore. The GNU linker uses these to
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select the output format, but we don't offer a choice. Ignoring
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these is more-or-less OK since most scripts simply explicitly
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choose the default. */
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ignore_cmd:
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OUTPUT_ARCH '(' string ')'
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;
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/* A list of external undefined symbols. We put the lexer into
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expression mode so that commas separate names; this is what the GNU
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linker does. */
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extern_name_list:
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{ script_push_lex_into_expression_mode(closure); }
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extern_name_list_body
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{ script_pop_lex_mode(closure); }
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;
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extern_name_list_body:
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string
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{ script_add_extern(closure, $1.value, $1.length); }
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| extern_name_list_body string
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{ script_add_extern(closure, $2.value, $2.length); }
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| extern_name_list_body ',' string
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{ script_add_extern(closure, $3.value, $3.length); }
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;
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/* A list of input file names. */
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input_list:
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input_list_element
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| input_list opt_comma input_list_element
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;
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/* An input file name. */
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input_list_element:
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string
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{ script_add_file(closure, $1.value, $1.length); }
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| '-' STRING
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{ script_add_library(closure, $2.value, $2.length); }
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| AS_NEEDED
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{ script_start_as_needed(closure); }
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'(' input_list ')'
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{ script_end_as_needed(closure); }
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;
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/* Commands in a SECTIONS block. */
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sections_block:
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sections_block section_block_cmd
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| /* empty */
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;
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/* A command which may appear within a SECTIONS block. */
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section_block_cmd:
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ENTRY '(' string ')'
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{ script_set_entry(closure, $3.value, $3.length); }
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| assignment end
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| ASSERT_K '(' parse_exp ',' string ')'
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{ script_add_assertion(closure, $3, $5.value, $5.length); }
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| INCLUDE string
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{ script_include_directive(PARSING_SECTIONS_BLOCK, closure,
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$2.value, $2.length); }
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| string section_header
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{ script_start_output_section(closure, $1.value, $1.length, &$2); }
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'{' section_cmds '}' section_trailer
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{ script_finish_output_section(closure, &$7); }
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;
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/* The header of an output section in a SECTIONS block--everything
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after the name. */
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section_header:
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{ script_push_lex_into_expression_mode(closure); }
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opt_address_and_section_type opt_at opt_align opt_subalign
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{ script_pop_lex_mode(closure); }
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opt_constraint
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{
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$$.address = $2.address;
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$$.section_type = $2.section_type;
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$$.load_address = $3;
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$$.align = $4;
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$$.subalign = $5;
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$$.constraint = $7;
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}
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;
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/* The optional address followed by the optional section type. This
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is a separate nonterminal to avoid a shift/reduce conflict on
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'(' in section_header. */
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opt_address_and_section_type:
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':'
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{
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$$.address = NULL;
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$$.section_type = SCRIPT_SECTION_TYPE_NONE;
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}
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| '(' ')' ':'
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{
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$$.address = NULL;
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$$.section_type = SCRIPT_SECTION_TYPE_NONE;
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}
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| exp ':'
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{
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$$.address = $1;
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$$.section_type = SCRIPT_SECTION_TYPE_NONE;
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}
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| exp '(' ')' ':'
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{
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$$.address = $1;
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$$.section_type = SCRIPT_SECTION_TYPE_NONE;
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}
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| '(' section_type ')' ':'
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{
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$$.address = NULL;
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$$.section_type = $2;
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}
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| exp '(' section_type ')' ':'
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{
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$$.address = $1;
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$$.section_type = $3;
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}
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;
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/* We only support NOLOAD. */
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section_type:
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NOLOAD
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{ $$ = SCRIPT_SECTION_TYPE_NOLOAD; }
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| DSECT
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{
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yyerror(closure, "DSECT section type is unsupported");
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$$ = SCRIPT_SECTION_TYPE_DSECT;
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}
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| COPY
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{
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yyerror(closure, "COPY section type is unsupported");
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$$ = SCRIPT_SECTION_TYPE_COPY;
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}
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| INFO
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{
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yyerror(closure, "INFO section type is unsupported");
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$$ = SCRIPT_SECTION_TYPE_INFO;
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}
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| OVERLAY
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{
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yyerror(closure, "OVERLAY section type is unsupported");
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$$ = SCRIPT_SECTION_TYPE_OVERLAY;
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}
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;
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/* The address at which an output section should be loaded. */
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opt_at:
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/* empty */
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{ $$ = NULL; }
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| AT '(' exp ')'
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{ $$ = $3; }
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;
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/* The alignment of an output section. */
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opt_align:
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/* empty */
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{ $$ = NULL; }
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| ALIGN_K '(' exp ')'
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{ $$ = $3; }
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;
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/* The input section alignment within an output section. */
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opt_subalign:
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/* empty */
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{ $$ = NULL; }
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| SUBALIGN '(' exp ')'
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{ $$ = $3; }
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;
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/* A section constraint. */
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opt_constraint:
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/* empty */
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{ $$ = CONSTRAINT_NONE; }
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| ONLY_IF_RO
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{ $$ = CONSTRAINT_ONLY_IF_RO; }
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| ONLY_IF_RW
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{ $$ = CONSTRAINT_ONLY_IF_RW; }
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| SPECIAL
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{ $$ = CONSTRAINT_SPECIAL; }
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;
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/* The trailer of an output section in a SECTIONS block. */
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section_trailer:
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opt_memspec opt_at_memspec opt_phdr opt_fill opt_comma
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{
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$$.fill = $4;
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$$.phdrs = $3;
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}
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;
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/* A memory specification for an output section. */
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opt_memspec:
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'>' string
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{ script_set_section_region(closure, $2.value, $2.length, 1); }
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| /* empty */
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;
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/* A memory specification for where to load an output section. */
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opt_at_memspec:
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AT '>' string
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{ script_set_section_region(closure, $3.value, $3.length, 0); }
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| /* empty */
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;
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/* The program segment an output section should go into. */
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opt_phdr:
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opt_phdr ':' string
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{ $$ = script_string_list_push_back($1, $3.value, $3.length); }
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| /* empty */
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{ $$ = NULL; }
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;
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/* The value to use to fill an output section. FIXME: This does not
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handle a string of arbitrary length. */
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opt_fill:
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'=' parse_exp
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{ $$ = $2; }
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| /* empty */
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{ $$ = NULL; }
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;
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/* Commands which may appear within the description of an output
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section in a SECTIONS block. */
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section_cmds:
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/* empty */
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| section_cmds section_cmd
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;
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/* A command which may appear within the description of an output
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section in a SECTIONS block. */
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section_cmd:
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assignment end
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| input_section_spec
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| data_length '(' parse_exp ')'
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{ script_add_data(closure, $1, $3); }
|
|
| ASSERT_K '(' parse_exp ',' string ')'
|
|
{ script_add_assertion(closure, $3, $5.value, $5.length); }
|
|
| FILL '(' parse_exp ')'
|
|
{ script_add_fill(closure, $3); }
|
|
| CONSTRUCTORS
|
|
{
|
|
/* The GNU linker uses CONSTRUCTORS for the a.out object
|
|
file format. It does nothing when using ELF. Since
|
|
some ELF linker scripts use it although it does
|
|
nothing, we accept it and ignore it. */
|
|
}
|
|
| SORT_BY_NAME '(' CONSTRUCTORS ')'
|
|
| INCLUDE string
|
|
{ script_include_directive(PARSING_SECTION_COMMANDS, closure,
|
|
$2.value, $2.length); }
|
|
| ';'
|
|
;
|
|
|
|
/* The length of data which may appear within the description of an
|
|
output section in a SECTIONS block. */
|
|
data_length:
|
|
QUAD
|
|
{ $$ = QUAD; }
|
|
| SQUAD
|
|
{ $$ = SQUAD; }
|
|
| LONG
|
|
{ $$ = LONG; }
|
|
| SHORT
|
|
{ $$ = SHORT; }
|
|
| BYTE
|
|
{ $$ = BYTE; }
|
|
;
|
|
|
|
/* An input section specification. This may appear within the
|
|
description of an output section in a SECTIONS block. */
|
|
input_section_spec:
|
|
input_section_no_keep
|
|
{ script_add_input_section(closure, &$1, 0); }
|
|
| KEEP '(' input_section_no_keep ')'
|
|
{ script_add_input_section(closure, &$3, 1); }
|
|
;
|
|
|
|
/* An input section specification within a KEEP clause. */
|
|
input_section_no_keep:
|
|
string
|
|
{
|
|
$$.file.name = $1;
|
|
$$.file.sort = SORT_WILDCARD_NONE;
|
|
$$.input_sections.sections = NULL;
|
|
$$.input_sections.exclude = NULL;
|
|
}
|
|
| wildcard_file '(' wildcard_sections ')'
|
|
{
|
|
$$.file = $1;
|
|
$$.input_sections = $3;
|
|
}
|
|
;
|
|
|
|
/* A wildcard file specification. */
|
|
wildcard_file:
|
|
wildcard_name
|
|
{
|
|
$$.name = $1;
|
|
$$.sort = SORT_WILDCARD_NONE;
|
|
}
|
|
| SORT_BY_NAME '(' wildcard_name ')'
|
|
{
|
|
$$.name = $3;
|
|
$$.sort = SORT_WILDCARD_BY_NAME;
|
|
}
|
|
;
|
|
|
|
/* A list of wild card section specifications. */
|
|
wildcard_sections:
|
|
wildcard_sections opt_comma wildcard_section
|
|
{
|
|
$$.sections = script_string_sort_list_add($1.sections, &$3);
|
|
$$.exclude = $1.exclude;
|
|
}
|
|
| wildcard_section
|
|
{
|
|
$$.sections = script_new_string_sort_list(&$1);
|
|
$$.exclude = NULL;
|
|
}
|
|
| wildcard_sections opt_comma EXCLUDE_FILE '(' exclude_names ')'
|
|
{
|
|
$$.sections = $1.sections;
|
|
$$.exclude = script_string_list_append($1.exclude, $5);
|
|
}
|
|
| EXCLUDE_FILE '(' exclude_names ')'
|
|
{
|
|
$$.sections = NULL;
|
|
$$.exclude = $3;
|
|
}
|
|
;
|
|
|
|
/* A single wild card specification. */
|
|
wildcard_section:
|
|
wildcard_name
|
|
{
|
|
$$.name = $1;
|
|
$$.sort = SORT_WILDCARD_NONE;
|
|
}
|
|
| SORT_BY_NAME '(' wildcard_section ')'
|
|
{
|
|
$$.name = $3.name;
|
|
switch ($3.sort)
|
|
{
|
|
case SORT_WILDCARD_NONE:
|
|
$$.sort = SORT_WILDCARD_BY_NAME;
|
|
break;
|
|
case SORT_WILDCARD_BY_NAME:
|
|
case SORT_WILDCARD_BY_NAME_BY_ALIGNMENT:
|
|
break;
|
|
case SORT_WILDCARD_BY_ALIGNMENT:
|
|
case SORT_WILDCARD_BY_ALIGNMENT_BY_NAME:
|
|
$$.sort = SORT_WILDCARD_BY_NAME_BY_ALIGNMENT;
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
| SORT_BY_ALIGNMENT '(' wildcard_section ')'
|
|
{
|
|
$$.name = $3.name;
|
|
switch ($3.sort)
|
|
{
|
|
case SORT_WILDCARD_NONE:
|
|
$$.sort = SORT_WILDCARD_BY_ALIGNMENT;
|
|
break;
|
|
case SORT_WILDCARD_BY_ALIGNMENT:
|
|
case SORT_WILDCARD_BY_ALIGNMENT_BY_NAME:
|
|
break;
|
|
case SORT_WILDCARD_BY_NAME:
|
|
case SORT_WILDCARD_BY_NAME_BY_ALIGNMENT:
|
|
$$.sort = SORT_WILDCARD_BY_ALIGNMENT_BY_NAME;
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
;
|
|
|
|
/* A list of file names to exclude. */
|
|
exclude_names:
|
|
exclude_names opt_comma wildcard_name
|
|
{ $$ = script_string_list_push_back($1, $3.value, $3.length); }
|
|
| wildcard_name
|
|
{ $$ = script_new_string_list($1.value, $1.length); }
|
|
;
|
|
|
|
/* A single wildcard name. We recognize '*' and '?' specially since
|
|
they are expression tokens. */
|
|
wildcard_name:
|
|
string
|
|
{ $$ = $1; }
|
|
| '*'
|
|
{
|
|
$$.value = "*";
|
|
$$.length = 1;
|
|
}
|
|
| '?'
|
|
{
|
|
$$.value = "?";
|
|
$$.length = 1;
|
|
}
|
|
;
|
|
|
|
/* A list of MEMORY definitions. */
|
|
memory_defs:
|
|
memory_defs opt_comma memory_def
|
|
| /* empty */
|
|
;
|
|
|
|
/* A single MEMORY definition. */
|
|
memory_def:
|
|
string memory_attr ':' memory_origin '=' parse_exp opt_comma memory_length '=' parse_exp
|
|
{ script_add_memory(closure, $1.value, $1.length, $2, $6, $10); }
|
|
|
|
|
INCLUDE string
|
|
{ script_include_directive(PARSING_MEMORY_DEF, closure,
|
|
$2.value, $2.length); }
|
|
|
|
|
;
|
|
|
|
/* The (optional) attributes of a MEMORY region. */
|
|
memory_attr:
|
|
'(' string ')'
|
|
{ $$ = script_parse_memory_attr(closure, $2.value, $2.length, 0); }
|
|
| /* Inverted attributes. */
|
|
'(' '!' string ')'
|
|
{ $$ = script_parse_memory_attr(closure, $3.value, $3.length, 1); }
|
|
| /* empty */
|
|
{ $$ = 0; }
|
|
;
|
|
|
|
memory_origin:
|
|
ORIGIN
|
|
|
|
|
ORG
|
|
|
|
|
'o'
|
|
;
|
|
|
|
memory_length:
|
|
LENGTH
|
|
|
|
|
LEN
|
|
|
|
|
'l'
|
|
;
|
|
|
|
/* A list of program header definitions. */
|
|
phdrs_defs:
|
|
phdrs_defs phdr_def
|
|
| /* empty */
|
|
;
|
|
|
|
/* A program header definition. */
|
|
phdr_def:
|
|
string phdr_type phdr_info ';'
|
|
{ script_add_phdr(closure, $1.value, $1.length, $2, &$3); }
|
|
;
|
|
|
|
/* A program header type. The GNU linker accepts a general expression
|
|
here, but that would be a pain because we would have to dig into
|
|
the expression structure. It's unlikely that anybody uses anything
|
|
other than a string or a number here, so that is all we expect. */
|
|
phdr_type:
|
|
string
|
|
{ $$ = script_phdr_string_to_type(closure, $1.value, $1.length); }
|
|
| INTEGER
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
/* Additional information for a program header. */
|
|
phdr_info:
|
|
/* empty */
|
|
{ memset(&$$, 0, sizeof(struct Phdr_info)); }
|
|
| string phdr_info
|
|
{
|
|
$$ = $2;
|
|
if ($1.length == 7 && strncmp($1.value, "FILEHDR", 7) == 0)
|
|
$$.includes_filehdr = 1;
|
|
else
|
|
yyerror(closure, "PHDRS syntax error");
|
|
}
|
|
| PHDRS phdr_info
|
|
{
|
|
$$ = $2;
|
|
$$.includes_phdrs = 1;
|
|
}
|
|
| string '(' INTEGER ')' phdr_info
|
|
{
|
|
$$ = $5;
|
|
if ($1.length == 5 && strncmp($1.value, "FLAGS", 5) == 0)
|
|
{
|
|
$$.is_flags_valid = 1;
|
|
$$.flags = $3;
|
|
}
|
|
else
|
|
yyerror(closure, "PHDRS syntax error");
|
|
}
|
|
| AT '(' parse_exp ')' phdr_info
|
|
{
|
|
$$ = $5;
|
|
$$.load_address = $3;
|
|
}
|
|
;
|
|
|
|
/* Set a symbol to a value. */
|
|
assignment:
|
|
string '=' parse_exp
|
|
{ script_set_symbol(closure, $1.value, $1.length, $3, 0, 0); }
|
|
| string PLUSEQ parse_exp
|
|
{
|
|
Expression_ptr s = script_exp_string($1.value, $1.length);
|
|
Expression_ptr e = script_exp_binary_add(s, $3);
|
|
script_set_symbol(closure, $1.value, $1.length, e, 0, 0);
|
|
}
|
|
| string MINUSEQ parse_exp
|
|
{
|
|
Expression_ptr s = script_exp_string($1.value, $1.length);
|
|
Expression_ptr e = script_exp_binary_sub(s, $3);
|
|
script_set_symbol(closure, $1.value, $1.length, e, 0, 0);
|
|
}
|
|
| string MULTEQ parse_exp
|
|
{
|
|
Expression_ptr s = script_exp_string($1.value, $1.length);
|
|
Expression_ptr e = script_exp_binary_mult(s, $3);
|
|
script_set_symbol(closure, $1.value, $1.length, e, 0, 0);
|
|
}
|
|
| string DIVEQ parse_exp
|
|
{
|
|
Expression_ptr s = script_exp_string($1.value, $1.length);
|
|
Expression_ptr e = script_exp_binary_div(s, $3);
|
|
script_set_symbol(closure, $1.value, $1.length, e, 0, 0);
|
|
}
|
|
| string LSHIFTEQ parse_exp
|
|
{
|
|
Expression_ptr s = script_exp_string($1.value, $1.length);
|
|
Expression_ptr e = script_exp_binary_lshift(s, $3);
|
|
script_set_symbol(closure, $1.value, $1.length, e, 0, 0);
|
|
}
|
|
| string RSHIFTEQ parse_exp
|
|
{
|
|
Expression_ptr s = script_exp_string($1.value, $1.length);
|
|
Expression_ptr e = script_exp_binary_rshift(s, $3);
|
|
script_set_symbol(closure, $1.value, $1.length, e, 0, 0);
|
|
}
|
|
| string ANDEQ parse_exp
|
|
{
|
|
Expression_ptr s = script_exp_string($1.value, $1.length);
|
|
Expression_ptr e = script_exp_binary_bitwise_and(s, $3);
|
|
script_set_symbol(closure, $1.value, $1.length, e, 0, 0);
|
|
}
|
|
| string OREQ parse_exp
|
|
{
|
|
Expression_ptr s = script_exp_string($1.value, $1.length);
|
|
Expression_ptr e = script_exp_binary_bitwise_or(s, $3);
|
|
script_set_symbol(closure, $1.value, $1.length, e, 0, 0);
|
|
}
|
|
| PROVIDE '(' string '=' parse_exp ')'
|
|
{ script_set_symbol(closure, $3.value, $3.length, $5, 1, 0); }
|
|
| PROVIDE_HIDDEN '(' string '=' parse_exp ')'
|
|
{ script_set_symbol(closure, $3.value, $3.length, $5, 1, 1); }
|
|
;
|
|
|
|
/* Parse an expression, putting the lexer into the right mode. */
|
|
parse_exp:
|
|
{ script_push_lex_into_expression_mode(closure); }
|
|
exp
|
|
{
|
|
script_pop_lex_mode(closure);
|
|
$$ = $2;
|
|
}
|
|
;
|
|
|
|
/* An expression. */
|
|
exp:
|
|
'(' exp ')'
|
|
{ $$ = $2; }
|
|
| '-' exp %prec UNARY
|
|
{ $$ = script_exp_unary_minus($2); }
|
|
| '!' exp %prec UNARY
|
|
{ $$ = script_exp_unary_logical_not($2); }
|
|
| '~' exp %prec UNARY
|
|
{ $$ = script_exp_unary_bitwise_not($2); }
|
|
| '+' exp %prec UNARY
|
|
{ $$ = $2; }
|
|
| exp '*' exp
|
|
{ $$ = script_exp_binary_mult($1, $3); }
|
|
| exp '/' exp
|
|
{ $$ = script_exp_binary_div($1, $3); }
|
|
| exp '%' exp
|
|
{ $$ = script_exp_binary_mod($1, $3); }
|
|
| exp '+' exp
|
|
{ $$ = script_exp_binary_add($1, $3); }
|
|
| exp '-' exp
|
|
{ $$ = script_exp_binary_sub($1, $3); }
|
|
| exp LSHIFT exp
|
|
{ $$ = script_exp_binary_lshift($1, $3); }
|
|
| exp RSHIFT exp
|
|
{ $$ = script_exp_binary_rshift($1, $3); }
|
|
| exp EQ exp
|
|
{ $$ = script_exp_binary_eq($1, $3); }
|
|
| exp NE exp
|
|
{ $$ = script_exp_binary_ne($1, $3); }
|
|
| exp LE exp
|
|
{ $$ = script_exp_binary_le($1, $3); }
|
|
| exp GE exp
|
|
{ $$ = script_exp_binary_ge($1, $3); }
|
|
| exp '<' exp
|
|
{ $$ = script_exp_binary_lt($1, $3); }
|
|
| exp '>' exp
|
|
{ $$ = script_exp_binary_gt($1, $3); }
|
|
| exp '&' exp
|
|
{ $$ = script_exp_binary_bitwise_and($1, $3); }
|
|
| exp '^' exp
|
|
{ $$ = script_exp_binary_bitwise_xor($1, $3); }
|
|
| exp '|' exp
|
|
{ $$ = script_exp_binary_bitwise_or($1, $3); }
|
|
| exp ANDAND exp
|
|
{ $$ = script_exp_binary_logical_and($1, $3); }
|
|
| exp OROR exp
|
|
{ $$ = script_exp_binary_logical_or($1, $3); }
|
|
| exp '?' exp ':' exp
|
|
{ $$ = script_exp_trinary_cond($1, $3, $5); }
|
|
| INTEGER
|
|
{ $$ = script_exp_integer($1); }
|
|
| string
|
|
{ $$ = script_symbol(closure, $1.value, $1.length); }
|
|
| MAX_K '(' exp ',' exp ')'
|
|
{ $$ = script_exp_function_max($3, $5); }
|
|
| MIN_K '(' exp ',' exp ')'
|
|
{ $$ = script_exp_function_min($3, $5); }
|
|
| DEFINED '(' string ')'
|
|
{ $$ = script_exp_function_defined($3.value, $3.length); }
|
|
| SIZEOF_HEADERS
|
|
{ $$ = script_exp_function_sizeof_headers(); }
|
|
| ALIGNOF '(' string ')'
|
|
{ $$ = script_exp_function_alignof($3.value, $3.length); }
|
|
| SIZEOF '(' string ')'
|
|
{ $$ = script_exp_function_sizeof($3.value, $3.length); }
|
|
| ADDR '(' string ')'
|
|
{ $$ = script_exp_function_addr($3.value, $3.length); }
|
|
| LOADADDR '(' string ')'
|
|
{ $$ = script_exp_function_loadaddr($3.value, $3.length); }
|
|
| ORIGIN '(' string ')'
|
|
{ $$ = script_exp_function_origin(closure, $3.value, $3.length); }
|
|
| LENGTH '(' string ')'
|
|
{ $$ = script_exp_function_length(closure, $3.value, $3.length); }
|
|
| CONSTANT '(' string ')'
|
|
{ $$ = script_exp_function_constant($3.value, $3.length); }
|
|
| ABSOLUTE '(' exp ')'
|
|
{ $$ = script_exp_function_absolute($3); }
|
|
| ALIGN_K '(' exp ')'
|
|
{ $$ = script_exp_function_align(script_exp_string(".", 1), $3); }
|
|
| ALIGN_K '(' exp ',' exp ')'
|
|
{ $$ = script_exp_function_align($3, $5); }
|
|
| BLOCK '(' exp ')'
|
|
{ $$ = script_exp_function_align(script_exp_string(".", 1), $3); }
|
|
| DATA_SEGMENT_ALIGN '(' exp ',' exp ')'
|
|
{
|
|
script_data_segment_align(closure);
|
|
$$ = script_exp_function_data_segment_align($3, $5);
|
|
}
|
|
| DATA_SEGMENT_RELRO_END '(' exp ',' exp ')'
|
|
{
|
|
script_data_segment_relro_end(closure);
|
|
$$ = script_exp_function_data_segment_relro_end($3, $5);
|
|
}
|
|
| DATA_SEGMENT_END '(' exp ')'
|
|
{ $$ = script_exp_function_data_segment_end($3); }
|
|
| SEGMENT_START '(' string ',' exp ')'
|
|
{
|
|
$$ = script_exp_function_segment_start($3.value, $3.length, $5);
|
|
/* We need to take note of any SEGMENT_START expressions
|
|
because they change the behaviour of -Ttext, -Tdata and
|
|
-Tbss options. */
|
|
script_saw_segment_start_expression(closure);
|
|
}
|
|
| ASSERT_K '(' exp ',' string ')'
|
|
{ $$ = script_exp_function_assert($3, $5.value, $5.length); }
|
|
;
|
|
|
|
/* Handle the --defsym option. */
|
|
defsym_expr:
|
|
string '=' parse_exp
|
|
{ script_set_symbol(closure, $1.value, $1.length, $3, 0, 0); }
|
|
;
|
|
|
|
/* Handle the --dynamic-list option. A dynamic list has the format
|
|
{ sym1; sym2; extern "C++" { namespace::sym3 }; };
|
|
We store the symbol we see in the "local" list; that is where
|
|
Command_line::in_dynamic_list() will look to do its check.
|
|
TODO(csilvers): More than one of these brace-lists can appear, and
|
|
should just be merged and treated as a single list. */
|
|
dynamic_list_expr: dynamic_list_nodes ;
|
|
|
|
dynamic_list_nodes:
|
|
dynamic_list_node
|
|
| dynamic_list_nodes dynamic_list_node
|
|
;
|
|
|
|
dynamic_list_node:
|
|
'{' vers_defns ';' '}' ';'
|
|
{ script_new_vers_node (closure, NULL, $2); }
|
|
;
|
|
|
|
/* A version script. */
|
|
version_script:
|
|
vers_nodes
|
|
;
|
|
|
|
vers_nodes:
|
|
vers_node
|
|
| vers_nodes vers_node
|
|
;
|
|
|
|
vers_node:
|
|
'{' vers_tag '}' ';'
|
|
{
|
|
script_register_vers_node (closure, NULL, 0, $2, NULL);
|
|
}
|
|
| string '{' vers_tag '}' ';'
|
|
{
|
|
script_register_vers_node (closure, $1.value, $1.length, $3,
|
|
NULL);
|
|
}
|
|
| string '{' vers_tag '}' verdep ';'
|
|
{
|
|
script_register_vers_node (closure, $1.value, $1.length, $3, $5);
|
|
}
|
|
;
|
|
|
|
verdep:
|
|
string
|
|
{
|
|
$$ = script_add_vers_depend (closure, NULL, $1.value, $1.length);
|
|
}
|
|
| verdep string
|
|
{
|
|
$$ = script_add_vers_depend (closure, $1, $2.value, $2.length);
|
|
}
|
|
;
|
|
|
|
vers_tag:
|
|
/* empty */
|
|
{ $$ = script_new_vers_node (closure, NULL, NULL); }
|
|
| vers_defns ';'
|
|
{ $$ = script_new_vers_node (closure, $1, NULL); }
|
|
| GLOBAL ':' vers_defns ';'
|
|
{ $$ = script_new_vers_node (closure, $3, NULL); }
|
|
| LOCAL ':' vers_defns ';'
|
|
{ $$ = script_new_vers_node (closure, NULL, $3); }
|
|
| GLOBAL ':' vers_defns ';' LOCAL ':' vers_defns ';'
|
|
{ $$ = script_new_vers_node (closure, $3, $7); }
|
|
;
|
|
|
|
/* Here is one of the rare places we care about the distinction
|
|
between STRING and QUOTED_STRING. For QUOTED_STRING, we do exact
|
|
matching on the pattern, so we pass in true for the exact_match
|
|
parameter. For STRING, we do glob matching and pass in false. */
|
|
vers_defns:
|
|
STRING
|
|
{
|
|
$$ = script_new_vers_pattern (closure, NULL, $1.value,
|
|
$1.length, 0);
|
|
}
|
|
| QUOTED_STRING
|
|
{
|
|
$$ = script_new_vers_pattern (closure, NULL, $1.value,
|
|
$1.length, 1);
|
|
}
|
|
| vers_defns ';' STRING
|
|
{
|
|
$$ = script_new_vers_pattern (closure, $1, $3.value,
|
|
$3.length, 0);
|
|
}
|
|
| vers_defns ';' QUOTED_STRING
|
|
{
|
|
$$ = script_new_vers_pattern (closure, $1, $3.value,
|
|
$3.length, 1);
|
|
}
|
|
| /* Push string on the language stack. */
|
|
EXTERN string '{'
|
|
{ version_script_push_lang (closure, $2.value, $2.length); }
|
|
vers_defns opt_semicolon '}'
|
|
{
|
|
$$ = $5;
|
|
version_script_pop_lang(closure);
|
|
}
|
|
| /* Push string on the language stack. This is more complicated
|
|
than the other cases because we need to merge the linked-list
|
|
state from the pre-EXTERN defns and the post-EXTERN defns. */
|
|
vers_defns ';' EXTERN string '{'
|
|
{ version_script_push_lang (closure, $4.value, $4.length); }
|
|
vers_defns opt_semicolon '}'
|
|
{
|
|
$$ = script_merge_expressions ($1, $7);
|
|
version_script_pop_lang(closure);
|
|
}
|
|
| EXTERN // "extern" as a symbol name
|
|
{
|
|
$$ = script_new_vers_pattern (closure, NULL, "extern",
|
|
sizeof("extern") - 1, 1);
|
|
}
|
|
| vers_defns ';' EXTERN
|
|
{
|
|
$$ = script_new_vers_pattern (closure, $1, "extern",
|
|
sizeof("extern") - 1, 1);
|
|
}
|
|
;
|
|
|
|
/* A string can be either a STRING or a QUOTED_STRING. Almost all the
|
|
time we don't care, and we use this rule. */
|
|
string:
|
|
STRING
|
|
{ $$ = $1; }
|
|
| QUOTED_STRING
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
/* Some statements require a terminator, which may be a semicolon or a
|
|
comma. */
|
|
end:
|
|
';'
|
|
| ','
|
|
;
|
|
|
|
/* An optional semicolon. */
|
|
opt_semicolon:
|
|
';'
|
|
| /* empty */
|
|
;
|
|
|
|
/* An optional comma. */
|
|
opt_comma:
|
|
','
|
|
| /* empty */
|
|
;
|
|
|
|
%%
|