gold/yyscript.y

   1 /* yyscript.y -- linker script grammer for gold.  */
   2
   3 /* This is a bison grammar to parse a subset of the original GNU ld
   4    linker script language.  */
   5
   6 %{
   7
   8 #include "config.h"
   9
  10 #include <stddef.h>
  11 #include <stdint.h>
  12
  13 #include "script-c.h"
  14
  15 %}
  16
  17 /* We need to use a pure parser because we might be multi-threaded.
  18    We pass some arguments through the parser to the lexer.  */
  19
  20 %pure-parser
  21
  22 %parse-param {void* closure}
  23 %lex-param {void* closure}
  24
  25 /* Since we require bison anyhow, we take advantage of it.  */
  26
  27 %error-verbose
  28
  29 /* The values associated with tokens.  */
  30
  31 %union {
  32   const char* string;
  33   int64_t integer;
  34 }
  35
  36 /* Operators, including a precedence table for expressions.  */
  37
  38 %right PLUSEQ MINUSEQ MULTEQ DIVEQ '=' LSHIFTEQ RSHIFTEQ ANDEQ OREQ
  39 %right '?' ':'
  40 %left OROR
  41 %left ANDAND
  42 %left '|'
  43 %left '^'
  44 %left '&'
  45 %left EQ NE
  46 %left '<' '>' LE GE
  47 %left LSHIFT RSHIFT
  48 %left '+' '-'
  49 %left '*' '/' '%'
  50
  51 /* Constants.  */
  52
  53 %token <string> STRING
  54 %token <integer> INTEGER
  55
  56 /* Keywords.  This list is taken from ldgram.y and ldlex.l in the old
  57    GNU linker, with the keywords which only appear in MRI mode
  58    removed.  Not all these keywords are actually used in this grammar.
  59    In most cases the keyword is recognized as the token name in upper
  60    case.  The comments indicate where this is not the case.  */
  61
  62 %token ABSOLUTE
  63 %token ADDR
  64 %token ALIGN_K          /* ALIGN */
  65 %token ASSERT_K         /* ASSERT */
  66 %token AS_NEEDED
  67 %token AT
  68 %token BIND
  69 %token BLOCK
  70 %token BYTE
  71 %token CONSTANT
  72 %token CONSTRUCTORS
  73 %token COPY
  74 %token CREATE_OBJECT_SYMBOLS
  75 %token DATA_SEGMENT_ALIGN
  76 %token DATA_SEGMENT_END
  77 %token DATA_SEGMENT_RELRO_END
  78 %token DEFINED
  79 %token DSECT
  80 %token ENTRY
  81 %token EXCLUDE_FILE
  82 %token EXTERN
  83 %token FILL
  84 %token FLOAT
  85 %token FORCE_COMMON_ALLOCATION
  86 %token GLOBAL           /* global */
  87 %token GROUP
  88 %token HLL
  89 %token INCLUDE
  90 %token INFO
  91 %token INHIBIT_COMMON_ALLOCATION
  92 %token INPUT
  93 %token KEEP
  94 %token LENGTH           /* LENGTH, l, len */
  95 %token LOADADDR
  96 %token LOCAL            /* local */
  97 %token LONG
  98 %token MAP
  99 %token MAX_K            /* MAX */
 100 %token MEMORY
 101 %token MIN_K            /* MIN */
 102 %token NEXT
 103 %token NOCROSSREFS
 104 %token NOFLOAT
 105 %token NOLOAD
 106 %token ONLY_IF_RO
 107 %token ONLY_IF_RW
 108 %token ORIGIN           /* ORIGIN, o, org */
 109 %token OUTPUT
 110 %token OUTPUT_ARCH
 111 %token OUTPUT_FORMAT
 112 %token OVERLAY
 113 %token PHDRS
 114 %token PROVIDE
 115 %token PROVIDE_HIDDEN
 116 %token QUAD
 117 %token SEARCH_DIR
 118 %token SECTIONS
 119 %token SEGMENT_START
 120 %token SHORT
 121 %token SIZEOF
 122 %token SIZEOF_HEADERS   /* SIZEOF_HEADERS, sizeof_headers */
 123 %token SORT_BY_ALIGNMENT
 124 %token SORT_BY_NAME
 125 %token SPECIAL
 126 %token SQUAD
 127 %token STARTUP
 128 %token SUBALIGN
 129 %token SYSLIB
 130 %token TARGET_K         /* TARGET */
 131 %token TRUNCATE
 132 %token VERSIONK         /* VERSION */
 133
 134 %%
 135
 136 file_list:
 137           file_list file_cmd
 138         | /* empty */
 139         ;
 140
 141 file_cmd:
 142           OUTPUT_FORMAT '(' STRING ')'
 143         | GROUP
 144             { script_start_group(closure); }
 145           '(' input_list ')'
 146             { script_end_group(closure); }
 147         ;
 148
 149 input_list:
 150           input_list_element
 151         | input_list opt_comma input_list_element
 152         ;
 153
 154 input_list_element:
 155           STRING
 156             { script_add_file(closure, $1); }
 157         | AS_NEEDED
 158             { script_start_as_needed(closure); }
 159           '(' input_list ')'
 160             { script_end_as_needed(closure); }
 161         ;
 162
 163 opt_comma:
 164           ','
 165         | /* empty */
 166         ;
 167
 168 %%