From dbe717effbdf31236088837f4686fd5ad5e71893 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@google.com>
Date: Tue, 14 Nov 2006 19:21:05 +0000
Subject: More dynamic object support, initial scripting support.

---
 gold/yyscript.y | 168 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 gold/yyscript.y

(limited to 'gold/yyscript.y')

diff --git a/gold/yyscript.y b/gold/yyscript.y
new file mode 100644
index 0000000..0bd2b60
--- /dev/null
+++ b/gold/yyscript.y
@@ -0,0 +1,168 @@
+/* yyscript.y -- linker script grammer for gold.  */
+
+/* This is a bison grammar to parse a subset of the original GNU ld
+   linker script language.  */
+
+%{
+
+#include "config.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "script-c.h"
+
+%}
+
+/* We need to use a pure parser because we might be multi-threaded.
+   We pass some arguments through the parser to the lexer.  */
+
+%pure-parser
+
+%parse-param {void* closure}
+%lex-param {void* closure}
+
+/* Since we require bison anyhow, we take advantage of it.  */
+
+%error-verbose
+
+/* The values associated with tokens.  */
+
+%union {
+  const char* string;
+  int64_t integer;
+}
+
+/* Operators, including a precedence table for expressions.  */
+
+%right PLUSEQ MINUSEQ MULTEQ DIVEQ '=' LSHIFTEQ RSHIFTEQ ANDEQ OREQ
+%right '?' ':'
+%left OROR
+%left ANDAND
+%left '|'
+%left '^'
+%left '&'
+%left EQ NE
+%left '<' '>' LE GE
+%left LSHIFT RSHIFT
+%left '+' '-'
+%left '*' '/' '%'
+
+/* Constants.  */
+
+%token <string> STRING
+%token <integer> INTEGER
+
+/* Keywords.  This list is taken from ldgram.y and ldlex.l in the old
+   GNU linker, with the keywords which only appear in MRI mode
+   removed.  Not all these keywords are actually used in this grammar.
+   In most cases the keyword is recognized as the token name in upper
+   case.  The comments indicate where this is not the case.  */
+
+%token ABSOLUTE
+%token ADDR
+%token ALIGN_K		/* ALIGN */
+%token ASSERT_K		/* ASSERT */
+%token AS_NEEDED
+%token AT
+%token BIND
+%token BLOCK
+%token BYTE
+%token CONSTANT
+%token CONSTRUCTORS
+%token COPY
+%token CREATE_OBJECT_SYMBOLS
+%token DATA_SEGMENT_ALIGN
+%token DATA_SEGMENT_END
+%token DATA_SEGMENT_RELRO_END
+%token DEFINED
+%token DSECT
+%token ENTRY
+%token EXCLUDE_FILE
+%token EXTERN
+%token FILL
+%token FLOAT
+%token FORCE_COMMON_ALLOCATION
+%token GLOBAL		/* global */
+%token GROUP
+%token HLL
+%token INCLUDE
+%token INFO
+%token INHIBIT_COMMON_ALLOCATION
+%token INPUT
+%token KEEP
+%token LENGTH		/* LENGTH, l, len */
+%token LOADADDR
+%token LOCAL		/* local */
+%token LONG
+%token MAP
+%token MAX_K		/* MAX */
+%token MEMORY
+%token MIN_K		/* MIN */
+%token NEXT
+%token NOCROSSREFS
+%token NOFLOAT
+%token NOLOAD
+%token ONLY_IF_RO
+%token ONLY_IF_RW
+%token ORIGIN		/* ORIGIN, o, org */
+%token OUTPUT
+%token OUTPUT_ARCH
+%token OUTPUT_FORMAT
+%token OVERLAY
+%token PHDRS
+%token PROVIDE
+%token PROVIDE_HIDDEN
+%token QUAD
+%token SEARCH_DIR
+%token SECTIONS
+%token SEGMENT_START
+%token SHORT
+%token SIZEOF
+%token SIZEOF_HEADERS	/* SIZEOF_HEADERS, sizeof_headers */
+%token SORT_BY_ALIGNMENT
+%token SORT_BY_NAME
+%token SPECIAL
+%token SQUAD
+%token STARTUP
+%token SUBALIGN
+%token SYSLIB
+%token TARGET_K		/* TARGET */
+%token TRUNCATE
+%token VERSIONK		/* VERSION */
+
+%%
+
+file_list:
+	  file_list file_cmd
+	| /* empty */
+	;
+
+file_cmd:
+	  OUTPUT_FORMAT '(' STRING ')'
+	| GROUP
+	    { script_start_group(closure); }
+	  '(' input_list ')'
+	    { script_end_group(closure); }
+	;
+
+input_list:
+	  input_list_element
+	| input_list opt_comma input_list_element
+	;
+
+input_list_element:
+	  STRING
+	    { script_add_file(closure, $1); }
+	| AS_NEEDED
+	    { script_start_as_needed(closure); }
+	  '(' input_list ')'
+	    { script_end_as_needed(closure); }
+	;
+
+opt_comma:
+	  ','
+	| /* empty */
+	;
+
+%%
-- 
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