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import sys
import pyparsing as pp
from pyparsing import pyparsing_common as ppc
LPAREN, RPAREN, LBRACE, RBRACE, LBROK, RBROK, COLON, SEMICOLON, EQUALS, COMMA = map(pp.Suppress, '(){}<>:;=,')
parse_suffix_int = lambda lit: int(lit[:-1]) * (10**(3*(1 + 'kmgtpe'.find(lit[-1].lower()))))
si_suffix = pp.oneOf('k m g t p e', caseless=True)
numeric_literal = pp.Regex('0x[0-9a-fA-F]+').setName('hex int').setParseAction(pp.tokenMap(int, 16)) \
| (pp.Regex('[0-9]+[kKmMgGtTpPeE]')).setName('size int').setParseAction(pp.tokenMap(parse_suffix_int)) \
| pp.Word(pp.nums).setName('int').setParseAction(pp.tokenMap(int))
access_def = pp.Regex('[rR]?[wW]?[xX]?').setName('access literal').setParseAction(pp.tokenMap(str.lower))
origin_expr = pp.Suppress(pp.CaselessKeyword('ORIGIN')) + EQUALS + numeric_literal
length_expr = pp.Suppress(pp.CaselessKeyword('LENGTH')) + EQUALS + numeric_literal
mem_expr = pp.Group(ppc.identifier + LPAREN + access_def + RPAREN + COLON + origin_expr + COMMA + length_expr)
mem_contents = pp.ZeroOrMore(mem_expr)
mem_toplevel = pp.CaselessKeyword("MEMORY") + pp.Group(LBRACE + pp.Optional(mem_contents, []) + RBRACE)
glob = pp.Word(pp.alphanums + '._*')
match_expr = pp.Forward()
assignment = pp.Forward()
funccall = pp.Group(pp.Word(pp.alphas + '_') + LPAREN + (assignment | numeric_literal | match_expr | glob | ppc.identifier) + RPAREN + pp.Optional(SEMICOLON))
value = numeric_literal | funccall | ppc.identifier | '.'
formula = (value + pp.oneOf('+ = * / %') + value) | value
# suppress stray semicolons
assignment << (SEMICOLON | pp.Group((ppc.identifier | '.') + EQUALS + (formula | value) + pp.Optional(SEMICOLON)))
match_expr << (glob + LPAREN + pp.OneOrMore(funccall | glob) + RPAREN)
section_contents = pp.ZeroOrMore(assignment | funccall | match_expr);
section_name = pp.Regex('\.[a-zA-Z0-9_.]+')
section_def = pp.Group(section_name + pp.Optional(numeric_literal) + COLON + LBRACE + pp.Group(section_contents) +
RBRACE + pp.Optional(RBROK + ppc.identifier + pp.Optional('AT' + RBROK + ppc.identifier)))
sec_contents = pp.ZeroOrMore(section_def | assignment)
sections_toplevel = pp.Group(pp.CaselessKeyword("SECTIONS").suppress() + LBRACE + sec_contents + RBRACE)
toplevel_elements = mem_toplevel | funccall | sections_toplevel | assignment
ldscript = pp.Group(pp.ZeroOrMore(toplevel_elements))
ldscript.ignore(pp.cppStyleComment)
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('linker_script', type=argparse.FileType('r'))
args = parser.parse_args()
#print(mem_expr.parseString('FLASH (rx) : ORIGIN = 0x0800000, LENGTH = 512K', parseAll=True))
# print(ldscript.parseString('''
# /* Entry Point */
# ENTRY(Reset_Handler)
#
# /* Highest address of the user mode stack */
# _estack = 0x20020000; /* end of RAM */
# /* Generate a link error if heap and stack don't fit into RAM */
# _Min_Heap_Size = 0x200;; /* required amount of heap */
# _Min_Stack_Size = 0x400;; /* required amount of stack */
# ''', parseAll=True))
print(ldscript.parseFile(args.linker_script, parseAll=True))
#print(funccall.parseString('KEEP(*(.isr_vector))'))
#print(section_contents.parseString('''
# . = ALIGN(4);
# KEEP(*(.isr_vector)) /* Startup code */
# . = ALIGN(4);
# ''', parseAll=True))
#print(section_def.parseString('''
# .text :
# {
# . = ALIGN(4);
# *(.text) /* .text sections (code) */
# *(.text*) /* .text* sections (code) */
# *(.glue_7) /* glue arm to thumb code */
# *(.glue_7t) /* glue thumb to arm code */
# *(.eh_frame)
#
# KEEP (*(.init))
# KEEP (*(.fini))
#
# . = ALIGN(4);
# _etext = .; /* define a global symbols at end of code */
# } >FLASH
# ''', parseAll=True))
#print(section_def.parseString('.ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH', parseAll=True))
#print(assignment.parseString('__preinit_array_start = .', parseAll=True))
#print(assignment.parseString('a = 23', parseAll=True))
#print(funccall.parseString('foo (a=23)', parseAll=True))
#print(funccall.parseString('PROVIDE_HIDDEN (__preinit_array_start = .);', parseAll=True))
#print(section_def.parseString('''
# .preinit_array :
# {
# PROVIDE_HIDDEN (__preinit_array_start = .);
# KEEP (*(.preinit_array*))
# PROVIDE_HIDDEN (__preinit_array_end = .);
# } >FLASH''', parseAll=True))
#print(match_expr.parseString('*(SORT(.init_array.*))', parseAll=True))
#print(funccall.parseString('KEEP (*(SORT(.init_array.*)))', parseAll=True))
#print(section_def.parseString('''
# .init_array :
# {
# PROVIDE_HIDDEN (__init_array_start = .);
# KEEP (*(SORT(.init_array.*)))
# KEEP (*(.init_array*))
# PROVIDE_HIDDEN (__init_array_end = .);
# } >FLASH
# ''', parseAll=True))
#print(match_expr.parseString('*(.ARM.extab* .gnu.linkonce.armextab.*)', parseAll=True))
#print(formula.parseString('. + _Min_Heap_Size', parseAll=True))
#print(assignment.parseString('. = . + _Min_Heap_Size;', parseAll=True))
#print(sections_toplevel.parseString('''
# SECTIONS
# {
# .ARMattributes : { }
# }
# ''', parseAll=True))
#sys.exit(0)
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