refactor asm module parsing code into separate file

1 files changed, 2 insertions, 266 deletions

diff --git a/emlink.py b/emlink.py
index 387b7de8..3db7578e 100644
--- a/emlink.py
+++ b/emlink.py
@@ -6,9 +6,9 @@ Fast static linker for emscripten outputs. Specifically this links asm.js module
 See https://github.com/kripken/emscripten/wiki/Linking
 '''
 
-import os, subprocess, sys, re
+import os, subprocess, sys
 from tools import shared
-from tools import js_optimizer
+from tools.asm_module import AsmModule
 
 try:
   me, main, side, out = sys.argv[:4]
@@ -22,270 +22,6 @@ print 'Output:', out
 
 shared.try_delete(out)
 
-class AsmModule():
-  def __init__(self, filename):
-    self.filename = filename
-    self.js = open(filename).read()
-
-    self.start_asm = self.js.find(js_optimizer.start_asm_marker)
-    self.start_funcs = self.js.find(js_optimizer.start_funcs_marker)
-    self.end_funcs = self.js.rfind(js_optimizer.end_funcs_marker)
-    self.end_asm = self.js.rfind(js_optimizer.end_asm_marker)
-
-    # pre
-    self.pre_js = self.js[:self.start_asm]
-
-    # heap initializer
-    self.staticbump = int(re.search(shared.JS.memory_staticbump_pattern, self.pre_js).group(1))
-    if self.staticbump:
-      self.mem_init_js = re.search(shared.JS.memory_initializer_pattern, self.pre_js).group(0)
-
-    # global initializers
-    global_inits = re.search(shared.JS.global_initializers_pattern, self.pre_js)
-    if global_inits:
-      self.global_inits_js = global_inits.group(0)
-      self.global_inits = map(lambda init: init.split('{')[2][1:].split('(')[0], global_inits.groups(0)[0].split(','))
-    else:
-      self.global_inits_js = ''
-      self.global_inits = []
-
-    # imports (and global variables)
-    first_var = self.js.find('var ', self.js.find('var ', self.start_asm)+4)
-    self.pre_imports_js = self.js[self.start_asm:first_var]
-    self.imports_js = self.js[first_var:self.start_funcs]
-    self.imports = {}
-    for imp in js_optimizer.import_sig.finditer(self.imports_js):
-      key, value = imp.group(0).split('var ')[1][:-1].split('=', 1)
-      self.imports[key.strip()] = value.strip()
-    #print >> sys.stderr, 'imports', self.imports
-
-    # funcs
-    self.funcs_js = self.js[self.start_funcs:self.end_funcs]
-    self.funcs = set([m.group(2) for m in js_optimizer.func_sig.finditer(self.funcs_js)])
-    #print 'funcs', self.funcs
-
-    # tables and exports
-    post_js = self.js[self.end_funcs:self.end_asm]
-    ret = post_js.find('return')
-    self.tables_js = post_js[:ret]
-    self.exports_js = post_js[ret:]
-    self.tables = self.parse_tables(self.tables_js)
-    self.exports = set([export.strip() for export in self.exports_js[self.exports_js.find('{')+1:self.exports_js.find('}')].split(',')])
-
-    # post
-    self.post_js = self.js[self.end_asm:]
-    self.sendings = {}
-    for sending in [sending.strip() for sending in self.post_js[self.post_js.find('}, { ')+5:self.post_js.find(' }, buffer);')].split(',')]:
-      colon = sending.find(':')
-      self.sendings[sending[:colon].replace('"', '')] = sending[colon+1:].strip()
-    self.module_defs = set(re.findall('var [\w\d_$]+ = Module\["[\w\d_$]+"\] = asm\["[\w\d_$]+"\];\n', self.post_js))
-
-  def relocate_into(self, main):
-    # heap initializer
-    if self.staticbump > 0:
-      new_mem_init = self.mem_init_js[:self.mem_init_js.rfind(', ')] + ', Runtime.GLOBAL_BASE+%d)' % main.staticbump
-      main.pre_js = re.sub(shared.JS.memory_staticbump_pattern, 'STATICTOP = STATIC_BASE + %d;\n' % (main.staticbump + side.staticbump) + new_mem_init, main.pre_js, count=1)
-
-    # Find function name replacements TODO: do not rename duplicate names with duplicate contents, just merge them
-    replacements = {}
-    for func in self.funcs:
-      rep = func
-      while rep in main.funcs:
-        rep += '_'
-        replacements[func] = rep
-    #print >> sys.stderr, 'replacements:', replacements
-
-    # sendings: add invokes for new tables
-    all_sendings = main.sendings
-    added_sending = False
-    for table in self.tables:
-      if table not in main.tables:
-        sig = table[table.rfind('_')+1:]
-        all_sendings['invoke_%s' % sig] = shared.JS.make_invoke(sig, named=False)
-        added_sending = True
-
-    # imports
-    all_imports = main.imports
-    for key, value in self.imports.iteritems():
-      if key in self.funcs or key in main.funcs: continue # external function in one module, implemented in the other
-      value_concrete = '.' not in value # env.key means it is an import, an external value, and not a concrete one
-      main_value = main.imports.get(key)
-      main_value_concrete = main_value and '.' not in main_value
-      if value_concrete and main_value_concrete: continue # standard global var
-      if not main_value or value_concrete:
-        if '+' in value:
-          # relocate
-          value = value.replace('(', '').replace(')', '').replace('| 0', '').replace('|0', '').replace(' ', '')
-          left, right = value.split('+')
-          assert left == 'H_BASE'
-          value = str(main.staticbump + int(right))
-        all_imports[key] = value
-      if (value_concrete or main_value_concrete) and key in all_sendings:
-        del all_sendings[key] # import of external value no longer needed
-    main.imports_js = '\n'.join(['var %s = %s;' % (key, value) for key, value in all_imports.iteritems()]) + '\n'
-
-    # check for undefined references to global variables
-    def check_import(key, value):
-      if value.startswith('+') or value.endswith('|0'): # ignore functions
-        if key not in all_sendings:
-          print >> sys.stderr, 'warning: external variable %s is still not defined after linking' % key
-          all_sendings[key] = '0'
-    for key, value in all_imports.iteritems(): check_import(key, value)
-
-    if added_sending:
-      sendings_js = ', '.join(['%s: %s' % (key, value) for key, value in all_sendings.iteritems()])
-      sendings_start = main.post_js.find('}, { ')+5
-      sendings_end = main.post_js.find(' }, buffer);')
-      main.post_js = main.post_js[:sendings_start] + sendings_js + main.post_js[sendings_end:]
-
-    # tables
-    f_bases = {}
-    f_sizes = {}
-    for table, data in self.tables.iteritems():
-      main.tables[table] = self.merge_tables(table, main.tables.get(table), data, replacements, f_bases, f_sizes)
-    main.combine_tables()
-    #print >> sys.stderr, 'f bases', f_bases
-
-    # relocate
-    temp = shared.Building.js_optimizer(self.filename, ['asm', 'relocate', 'last'], extra_info={
-      'replacements': replacements,
-      'fBases': f_bases,
-      'hBase': main.staticbump
-    })
-    #print >> sys.stderr, 'relocated side into', temp
-    relocated_funcs = AsmModule(temp)
-    shared.try_delete(temp)
-    main.extra_funcs_js = relocated_funcs.funcs_js.replace(js_optimizer.start_funcs_marker, '\n')
-
-    # update function table uses
-    ft_marker = 'FUNCTION_TABLE_'
-
-    def update_fts(what):
-      updates = []
-      i = 1 # avoid seeing marker in recursion
-      while 1:
-        i = what.find(ft_marker, i)
-        if i < 0: break;
-        start = i
-        end = what.find('[', start)
-        table = what[i:end]
-        if table not in f_sizes:
-          # table was not modified
-          i += len(ft_marker)
-          continue
-        nesting = 1
-        while nesting > 0:
-          next = what.find(']', end+1)
-          nesting -= 1
-          nesting += what.count('[', end+1, next)
-          end = next
-        assert end > 0
-        mask = what.rfind('&', start, end)
-        assert mask > 0 and end - mask <= 13
-        fixed = update_fts(what[start:mask+1] + str(f_sizes[table]-1) + ']')
-        updates.append((start, end, fixed))
-        i = end # additional function table uses were done by recursion
-      # apply updates
-      if len(updates) == 0: return what
-      parts = []
-      so_far = 0
-      for i in range(len(updates)):
-        start, end, fixed = updates[i]
-        parts.append(what[so_far:start])
-        parts.append(fixed)
-        so_far = end+1
-      parts.append(what[so_far:])
-      return ''.join(parts)
-
-    main.funcs_js = update_fts(main.funcs_js)
-    main.extra_funcs_js = update_fts(main.extra_funcs_js)
-
-    # global initializers
-    if self.global_inits:
-      my_global_inits = map(lambda init: replacements[init] if init in replacements else init, self.global_inits)
-      all_global_inits = map(lambda init: '{ func: function() { %s() } }' % init, main.global_inits + my_global_inits)
-      all_global_inits_js = '/* global initializers */ __ATINIT__.push(' + ','.join(all_global_inits) + ');'
-      if main.global_inits:
-        target = main.global_inits_js
-      else:
-        target = '// === Body ===\n'
-        all_global_inits_js = target + all_global_inits_js
-      main.pre_js = main.pre_js.replace(target, all_global_inits_js)
-
-    # exports
-    def rep_exp(export):
-      key, value = export.split(':')
-      if key in replacements:
-        repped = replacements[key]
-        return repped + ': ' + repped
-      return export
-    my_exports = map(rep_exp, self.exports)
-    exports = main.exports.union(my_exports)
-    main.exports_js = 'return {' + ','.join(list(exports)) + '};\n})\n'
-
-    # post
-    def rep_def(deff):
-      key = deff.split(' ')[1]
-      if key in replacements:
-        rep = replacements[key]
-        return 'var %s = Module["%s"] = asm["%s"];\n' % (rep, rep, rep)
-      return deff
-    my_module_defs = map(rep_def, self.module_defs)
-    new_module_defs = set(my_module_defs).difference(main.module_defs)
-    if len(new_module_defs) > 0:
-      position = main.post_js.find('Runtime.') # Runtime is the start of the hardcoded ones
-      main.post_js = main.post_js[:position] + ''.join(list(new_module_defs)) + '\n' + main.post_js[position:]
-
-  def write(self, out):
-    f = open(out, 'w')
-    f.write(self.pre_js)
-    f.write(self.pre_imports_js)
-    f.write(self.imports_js)
-    f.write(self.funcs_js)
-    f.write(self.extra_funcs_js)
-    f.write(self.tables_js)
-    f.write(self.exports_js)
-    f.write(self.post_js)
-    f.close()
-
-  # Utilities
-
-  def parse_tables(self, js):
-    tables = {}
-    parts = js.split(';')
-    for part in parts:
-      if '=' not in part: continue
-      part = part.split('var ')[1]
-      name, data = part.split(' = ')
-      tables[name] = data
-    return tables
-
-  def merge_tables(self, table, main, side, replacements, f_bases, f_sizes):
-    sig = table.split('_')[-1]
-    side = side[1:-1].split(',')
-    side = map(lambda f: replacements[f] if f in replacements else f, side)
-    if not main:
-      f_bases[sig] = 0
-      f_sizes[table] = len(side)
-      return '[' + ','.join(side) + ']'
-    main = main[1:-1].split(',')
-    # TODO: handle non-aliasing case too
-    assert len(main) % 2 == 0
-    f_bases[sig] = len(main)
-    ret = main + side
-    size = 2
-    while size < len(ret): size *= 2
-    aborter = ret[1] # we can assume odd indexes have an aborting function with the right signature
-    ret = ret + [aborter]*(size - len(ret))
-    assert len(ret) == size
-    f_sizes[table] = size
-    return '[' + ','.join(ret) + ']'
-
-  def combine_tables(self):
-    self.tables_js = '// EMSCRIPTEN_END_FUNCS\n'
-    for table, data in self.tables.iteritems():
-      self.tables_js += 'var %s = %s;\n' % (table, data)
-
 main = AsmModule(main)
 side = AsmModule(side)