Strange Segmentation Fault in glsl-optimizer + emscripten opitimizations

asm-o1-optimizations.js

function __ZL25remove_unlinked_functionsPKvPvS1_($key, $data, $closure) {
 $key = $key | 0;
 $data = $data | 0;
 $closure = $closure | 0;
 var $0 = 0, $1 = 0, $10 = 0, $11 = 0, $12 = 0, $13 = 0, $14 = 0, $15 = 0, $16 = 0, $17 = 0, $18 = 0, $19 = 0, $2 = 0, $3 = 0, $4 = 0, $5 = 0, $6 = 0, $7 = 0, $8 = 0, $9 = 0;
 var label = 0, sp = 0;
 sp = STACKTOP;
 $0 = $data + 16 | 0;
 $1 = __ZNK9exec_list8is_emptyEv($0) | 0;
 if (!$1) {
  $2 = $data + 4 | 0;
  $3 = __ZNK9exec_list8is_emptyEv($2) | 0;
  if (!$3) {
   return;
  }
 }
 $4 = __ZNK9exec_list8is_emptyEv($0) | 0;
 if (!$4) {
  while (1) {
   $7 = __ZN9exec_list8pop_headEv($0) | 0;
   $8 = $7 + 8 | 0;
   $9 = SAFE_HEAP_LOAD($8 | 0, 4, 0, 0) | 0 | 0;
   $10 = $9 + 4 | 0;
   __ZL13destroy_linksP9exec_listPN12_GLOBAL__N_18functionE($10, $data);
   $11 = __ZNK9exec_list8is_emptyEv($0) | 0;
   if ($11) {
    break;
   }
  }
 }
 $5 = $data + 4 | 0;
 $6 = __ZNK9exec_list8is_emptyEv($5) | 0;
 if (!$6) {
  while (1) {
   $12 = __ZN9exec_list8pop_headEv($5) | 0;
   $13 = $12 + 8 | 0;
   $14 = SAFE_HEAP_LOAD($13 | 0, 4, 0, 0) | 0 | 0;
   $15 = $14 + 16 | 0;
   __ZL13destroy_linksP9exec_listPN12_GLOBAL__N_18functionE($15, $data);
   $16 = __ZNK9exec_list8is_emptyEv($5) | 0;
   if ($16) {
    break;
   }
  }
 }
 $17 = $closure + 32 | 0;
 $18 = SAFE_HEAP_LOAD($17 | 0, 4, 0, 0) | 0 | 0;
 _hash_table_remove($18, $key);
 $19 = $closure + 40 | 0;
 SAFE_HEAP_STORE($19 >> 0 | 0, 1 | 0, 1, 0);
 return;
}

asm.js

function __ZL25remove_unlinked_functionsPKvPvS1_($key, $data, $closure) {
 $key = $key | 0;
 $data = $data | 0;
 $closure = $closure | 0;
 var $1 = 0, $11 = 0, $17 = 0, $23 = 0, $28 = 0, $30 = 0, $36 = 0, $42 = 0, $5 = 0, $7 = 0, $9 = 0, $__next$0$in$i = 0, $__next$0$in$i8 = 0, $__next$0$in$in4$i = 0, $__next$0$in$in4$i$phi = 0, $__next$0$in$in4$i4 = 0, $__next$0$in$in4$i4$phi = 0, $__next$0$in2$i = 0, $__next$0$in2$i2 = 0, $__next$0$in5$i = 0, $__next$0$in5$i3 = 0, $node$0$in3$i = 0, $node$0$in3$i$phi = 0, $node$0$in3$i5 = 0, $node$0$in3$i5$phi = 0;
 $1 = SAFE_HEAP_LOAD($data + 16 | 0, 4, 0, 0) | 0 | 0;
 $5 = SAFE_HEAP_LOAD($data + 4 | 0, 4, 0, 0) | 0 | 0;
 $7 = ($5 | 0) == ($data + 8 | 0);
 do if (($1 | 0) == ($data + 20 | 0)) {
  if ($7) {
   _hash_table_remove(SAFE_HEAP_LOAD($closure + 32 | 0, 4, 0, 0) | 0 | 0, $key);
   SAFE_HEAP_STORE($closure + 40 >> 0 | 0, 1 | 0, 1, 0);
   break;
  }
  L5 : while (1) {
   if ($5) {
    $28 = $5 + 4 | 0;
    $30 = SAFE_HEAP_LOAD($5 | 0, 4, 0, 0) | 0 | 0;
    SAFE_HEAP_STORE($30 + 4 | 0, SAFE_HEAP_LOAD($28 | 0, 4, 0, 0) | 0 | 0, 4, 0);
    SAFE_HEAP_STORE(SAFE_HEAP_LOAD($28 | 0, 4, 0, 0) | 0 | 0, $30 | 0, 4, 0);
    SAFE_HEAP_STORE($5 | 0, 0 | 0, 4, 0);
    SAFE_HEAP_STORE($28 | 0, 0 | 0, 4, 0);
   }
   $36 = SAFE_HEAP_LOAD((SAFE_HEAP_LOAD($5 + 8 | 0, 4, 0, 0) | 0 | 0) + 16 | 0, 4, 0, 0) | 0 | 0;
   $__next$0$in2$i = SAFE_HEAP_LOAD($36 | 0, 4, 0, 0) | 0 | 0;
   if (!$__next$0$in2$i) continue; else {
    $__next$0$in$in4$i = $36;
    $__next$0$in5$i = $__next$0$in2$i;
    $node$0$in3$i = $36;
   }
   while (1) {
    if ((SAFE_HEAP_LOAD($node$0$in3$i + 8 | 0, 4, 0, 0) | 0 | 0) == ($data | 0)) {
     $42 = $node$0$in3$i + 4 | 0;
     SAFE_HEAP_STORE($__next$0$in5$i + 4 | 0, SAFE_HEAP_LOAD($42 | 0, 4, 0, 0) | 0 | 0, 4, 0);
     SAFE_HEAP_STORE(SAFE_HEAP_LOAD($42 | 0, 4, 0, 0) | 0 | 0, $__next$0$in5$i | 0, 4, 0);
     SAFE_HEAP_STORE($__next$0$in$in4$i | 0, 0 | 0, 4, 0);
     SAFE_HEAP_STORE($42 | 0, 0 | 0, 4, 0);
    }
    $__next$0$in$i = SAFE_HEAP_LOAD($__next$0$in5$i | 0, 4, 0, 0) | 0 | 0;
    if (!$__next$0$in$i) continue L5; else {
     $node$0$in3$i$phi = $__next$0$in5$i;
     $__next$0$in$in4$i$phi = $__next$0$in5$i;
     $__next$0$in5$i = $__next$0$in$i;
     $node$0$in3$i = $node$0$in3$i$phi;
     $__next$0$in$in4$i = $__next$0$in$in4$i$phi;
    }
   }
  }
 } else if ($7) L16 : while (1) {
  if ($1) {
   $9 = $1 + 4 | 0;
   $11 = SAFE_HEAP_LOAD($1 | 0, 4, 0, 0) | 0 | 0;
   SAFE_HEAP_STORE($11 + 4 | 0, SAFE_HEAP_LOAD($9 | 0, 4, 0, 0) | 0 | 0, 4, 0);
   SAFE_HEAP_STORE(SAFE_HEAP_LOAD($9 | 0, 4, 0, 0) | 0 | 0, $11 | 0, 4, 0);
   SAFE_HEAP_STORE($1 | 0, 0 | 0, 4, 0);
   SAFE_HEAP_STORE($9 | 0, 0 | 0, 4, 0);
  }
  $17 = SAFE_HEAP_LOAD((SAFE_HEAP_LOAD($1 + 8 | 0, 4, 0, 0) | 0 | 0) + 4 | 0, 4, 0, 0) | 0 | 0;
  $__next$0$in2$i2 = SAFE_HEAP_LOAD($17 | 0, 4, 0, 0) | 0 | 0;
  if (!$__next$0$in2$i2) continue; else {
   $__next$0$in$in4$i4 = $17;
   $__next$0$in5$i3 = $__next$0$in2$i2;
   $node$0$in3$i5 = $17;
  }
  while (1) {
   if ((SAFE_HEAP_LOAD($node$0$in3$i5 + 8 | 0, 4, 0, 0) | 0 | 0) == ($data | 0)) {
    $23 = $node$0$in3$i5 + 4 | 0;
    SAFE_HEAP_STORE($__next$0$in5$i3 + 4 | 0, SAFE_HEAP_LOAD($23 | 0, 4, 0, 0) | 0 | 0, 4, 0);
    SAFE_HEAP_STORE(SAFE_HEAP_LOAD($23 | 0, 4, 0, 0) | 0 | 0, $__next$0$in5$i3 | 0, 4, 0);
    SAFE_HEAP_STORE($__next$0$in$in4$i4 | 0, 0 | 0, 4, 0);
    SAFE_HEAP_STORE($23 | 0, 0 | 0, 4, 0);
   }
   $__next$0$in$i8 = SAFE_HEAP_LOAD($__next$0$in5$i3 | 0, 4, 0, 0) | 0 | 0;
   if (!$__next$0$in$i8) continue L16; else {
    $node$0$in3$i5$phi = $__next$0$in5$i3;
    $__next$0$in$in4$i4$phi = $__next$0$in5$i3;
    $__next$0$in5$i3 = $__next$0$in$i8;
    $node$0$in3$i5 = $node$0$in3$i5$phi;
    $__next$0$in$in4$i4 = $__next$0$in$in4$i4$phi;
   }
  }
 } while (0);
 return;
}

ir_function_detect_recursion.cpp

/**
 * Remove a function if it has either no in or no out links
 */
static void
remove_unlinked_functions(const void *key, void *data, void *closure)
{
   has_recursion_visitor *visitor = (has_recursion_visitor *) closure;
   function *f = (function *) data;

   if (f->callers.is_empty() || f->callees.is_empty()) {
      while (!f->callers.is_empty()) {
         struct call_node *n = (struct call_node *) f->callers.pop_head();
         destroy_links(& n->func->callees, f);
      }

      while (!f->callees.is_empty()) {
         struct call_node *n = (struct call_node *) f->callees.pop_head();
         destroy_links(& n->func->callers, f);
      }

      hash_table_remove(visitor->function_hash, key);
      visitor->progress = true;
   }
}

stack trace

Uncaught abort("segmentation fault storing 4 bytes to address 0") at Error
    at jsStackTrace (http://localhost:8000/gits/glsl-optimizer/glsl-optimizer.js:1227:13)
    at stackTrace (http://localhost:8000/gits/glsl-optimizer/glsl-optimizer.js:1244:22)
    at abort (http://localhost:8000/gits/glsl-optimizer/glsl-optimizer.js:139828:44)
    at SAFE_HEAP_STORE (http://localhost:8000/gits/glsl-optimizer/glsl-optimizer.js:363:85)
    at Array.__ZL25remove_unlinked_functionsPKvPvS1_ [remove_unlinked_functions(void const*, void*, void*)] (http://localhost:8000/gits/glsl-optimizer/glsl-optimizer.js:100247:4)
    at _hash_table_call_foreach (http://localhost:8000/gits/glsl-optimizer/glsl-optimizer.js:122267:73)
    at __Z25detect_recursion_unlinkedP22_mesa_glsl_parse_stateP9exec_list [detect_recursion_unlinked(_mesa_glsl_parse_state*, exec_list*)] (http://localhost:8000/gits/glsl-optimizer/glsl-optimizer.js:124528:3)
    at __Z16_mesa_ast_to_hirP9exec_listP22_mesa_glsl_parse_state [_mesa_ast_to_hir(exec_list*, _mesa_glsl_parse_state*)] (http://localhost:8000/gits/glsl-optimizer/glsl-optimizer.js:75238:2)
    at __Z16glslopt_optimizeP11glslopt_ctx19glslopt_shader_typePKcj [glslopt_optimize(glslopt_ctx*, glslopt_shader_type, char const*, unsigned int)] (http://localhost:8000/gits/glsl-optimizer/glsl-optimizer.js:67724:5)
    at _optimize_glsl (http://localhost:8000/gits/glsl-optimizer/glsl-optimizer.js:109512:8)abort @ glsl-optimizer.js:139832SAFE_HEAP_STORE @ glsl-optimizer.js:363__ZL25remove_unlinked_functionsPKvPvS1_ @ glsl-optimizer.js:100247_hash_table_call_foreach @ glsl-optimizer.js:122267__Z25detect_recursion_unlinkedP22_mesa_glsl_parse_stateP9exec_list @ glsl-optimizer.js:124528__Z16_mesa_ast_to_hirP9exec_listP22_mesa_glsl_parse_state @ glsl-optimizer.js:75238__Z16glslopt_optimizeP11glslopt_ctx19glslopt_shader_typePKcj @ glsl-optimizer.js:67724_optimize_glsl @ glsl-optimizer.js:109512asm._optimize_glsl @ glsl-optimizer.js:137853(anonymous function) @ VM395:6optimize @ (index):106onclick @ (index):48