169 lines
3.1 KiB
Plaintext
169 lines
3.1 KiB
Plaintext
/* yyscript.y -- linker script grammer for gold. */
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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 "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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const char* string;
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int64_t integer;
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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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/* Constants. */
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%token <string> 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 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 INFO
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%token INHIBIT_COMMON_ALLOCATION
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%token INPUT
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%token KEEP
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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 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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%%
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file_list:
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file_list file_cmd
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| /* empty */
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;
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file_cmd:
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OUTPUT_FORMAT '(' STRING ')'
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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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;
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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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input_list_element:
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STRING
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{ script_add_file(closure, $1); }
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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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opt_comma:
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','
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| /* empty */
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;
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%%
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