tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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Script-getLineOffsets-06.js (2655B)

      1 // getLineOffsets works with extended instructions, such as JSOP_GOTOX.
      2 
      3 var g = newGlobal({newCompartment: true});
      4 g.line0 = null;
      5 var dbg = Debugger(g);
      6 var where;
      7 dbg.onDebuggerStatement = function (frame) {
      8    var s = frame.script;
      9    var offs;
     10    var lineno = g.line0 + where;
     11    offs = s.getLineOffsets(lineno);
     12    for (var i = 0; i < offs.length; i++) {
     13        assertEq(s.getOffsetLocation(offs[i]).lineNumber, lineno);
     14        s.setBreakpoint(offs[i], {hit: function (frame) { g.log += 'B'; }});
     15    }
     16    g.log += 'A';
     17 };
     18 
     19 function test(s) {
     20    assertEq(s.charAt(s.length - 1) !== '\n', true);
     21    var count = s.split(/\n/).length;  // number of lines in s
     22    g.i = 0;
     23    g.log = '';
     24    where = 1 + count;
     25    g.eval("line0 = Error().lineNumber;\n" +
     26           "debugger;\n" +          // line0 + 1
     27           s +                      // line0 + 2 ... line0 + where
     28           " log += 'C';\n");
     29    assertEq(g.log, 'ABC');
     30 }
     31 
     32 function repeat(s) {
     33    return Array((1 << 14) + 1).join(s);  // 16K copies of s
     34 }
     35 var long_expr = "i" + repeat(" + i");
     36 var long_throw_stmt = "throw " + long_expr + ";\n";
     37 
     38 // long break (JSOP_GOTOX)
     39 test("for (;;) {\n" +
     40     "    if (i === 0)\n" +
     41     "        break;\n" +
     42     "    " + long_throw_stmt +
     43     "}");
     44 
     45 // long continue (JSOP_GOTOX)
     46 test("do {\n" +
     47     "    if (i === 0)\n" +
     48     "        continue;\n" +
     49     "    " + long_throw_stmt +
     50     "} while (i !== 0);");
     51 
     52 // long if consequent (JSOP_IFEQX)
     53 test("if (i === 2) {\n" +
     54     "    " + long_throw_stmt +
     55     "}");
     56 
     57 // long catch-block with finally (JSOP_GOSUBX)
     58 test("try {\n" +
     59     "    i = 0;\n" +
     60     "} catch (exc) {\n" +
     61     "    throw " + long_expr + ";\n" +
     62     "} finally {\n" +
     63     "    i = 1;\n" +
     64     "}");
     65 
     66 // long case (JSOP_TABLESWITCHX)
     67 test("switch (i) {\n" +
     68     "  default:\n" +
     69     "  case 1: " + long_throw_stmt +
     70     "  case 0: i++; }");
     71 
     72 test("switch (i) {\n" +
     73     "  case 1: case 2: case 3: " + long_throw_stmt +
     74     "  default: i++; }");
     75 
     76 // long case (JSOP_LOOKUPSWITCHX)
     77 test("switch ('' + i) {\n" +
     78     "  default:\n" +
     79     "  case '1': " + long_throw_stmt +
     80     "  case '0': i++; }");
     81 
     82 test("switch (i) {\n" +
     83     "  case '1': case '2': case '3': " + long_throw_stmt +
     84     "  default: i++; }");
     85 
     86 // long case or case-expression (JSOP_CASEX)
     87 test("switch (i) {\n" +
     88     "  case i + 1 - i:\n" +
     89     "  default:\n" +
     90     "    " + long_throw_stmt +
     91     "  case i + i:\n" +
     92     "    i++; break; }");
     93 
     94 // long case when JSOP_CASE is used (JSOP_DEFAULTX)
     95 test("switch (i) {\n" +
     96     "  case i + 1 - i:\n" +
     97     "    " + long_throw_stmt +
     98     "  default:\n" +
     99     "    i++; break; }");