Add more systematic tests for comparisons.

tools/compare-table-gen.js

Index: tools/compare-table-gen.js
diff --git a/tools/compare-table-gen.js b/tools/compare-table-gen.js
new file mode 100644
index 0000000000000000000000000000000000000000..151be81517d6ad6dbf1c9ce858f5e8f125bc51b7
--- /dev/null
+++ b/tools/compare-table-gen.js
@@ -0,0 +1,108 @@
+// Generates a comparison table test case.
+// Usage: d8 compare-table-gen.js -- lt|lteq|gt|gteq|eq|ne|eq|sne
+
+var strings = ["true", "false", "null", "void 0", "0", "0.0", "-0", "\"\"", "-1", "-1.25", "1", "1.25", "-2147483648", "2147483648", "Infinity", "-Infinity", "NaN"];
+var values = new Array(strings.length);
+for (var i = 0; i < strings.length; i++) {
+  values[i] = eval(strings[i]);
+}
+
+function test() {
+  for (var i = 0; i < values.length; i++) {
+    for (var j = 0; j < values.length; j++) {
+      var a = values[i];
+      var b = values[j];
+      var x = expected[i][j];
+      assertEquals(x, func(a,b));
+      assertEquals(x, left_funcs[i](b));
+      assertEquals(x, right_funcs[j](a));
+    }
+  }
+
+  var result = matrix();
+  for (var i = 0; i < values.length; i++) {
+    for (var j = 0; j < values.length; j++) {
+      assertEquals(expected[i][j], result[i][j]);
+    }
+  }
+}
+
+function gen(name, cmp) {
+
+  print("// Copyright 2015 the V8 project authors. All rights reserved.");
+  print("// Use of this source code is governed by a BSD-style license that can be");
+  print("// found in the LICENSE file.");
+  print();
+  print("var values = [" + strings + "];");
+
+  var body = "(function " + name + "(a,b) { return a " + cmp + " b; })";
+  var func = eval(body);
+
+  print("var expected = [");
+
+  for (var i = 0; i < values.length; i++) {
+    var line = "  [";
+    for (var j = 0; j < values.length; j++) {
+      if (j > 0) line += ",";
+      line += func(values[i], values[j]) ? "true " : "false";
+    }
+    line += "]";
+    if (i < (values.length - 1)) line += ",";
+    print(line);
+  }
+  print("];");
+
+  print("var func = " + body + ";");
+  print("var left_funcs = [");
+
+  for (var i = 0; i < values.length; i++) {
+    var value = strings[i];
+    var body = "(function " + name + "_L" + i + "(b) { return " + value + " " + cmp + " b; })";
+    var end = i < (values.length - 1) ? "," : "";
+    print("  " + body + end);
+  }
+  print("];");
+
+  print("var right_funcs = [");
+  for (var i = 0; i < values.length; i++) {
+    var value = strings[i];
+    var body = "(function " + name + "_R" + i + "(a) { return a " + cmp + " " + value + "; })";
+    var end = i < (values.length - 1) ? "," : "";
+    print("  " + body + end);
+  }
+  print("];");
+
+  print("function matrix() {");
+  print("  return [");
+  for (var i = 0; i < values.length; i++) {
+    var line = "    [";
+    for (var j = 0; j < values.length; j++) {
+      if (j > 0) line += ",";
+      line += strings[i] + " " + cmp + " " + strings[j];
+    }
+    line += "]";
+    if (i < (values.length - 1)) line += ",";
+    print(line);
+  }
+  print("  ];");
+  print("}");
+
+
+  print(test.toString());
+  print("test();");
+  print("test();");
+
+  print();
+  print();
+}
+
+switch (arguments[0]) {
+  case "lt":   gen("lt",   "<"); break;
+  case "lteq": gen("lteq", "<="); break;
+  case "gt":   gen("gt",   ">"); break;
+  case "gteq": gen("gteq", ">="); break;
+  case "eq":   gen("eq",   "=="); break;
+  case "ne":   gen("ne",   "!="); break;
+  case "seq":  gen("seq",  "==="); break;
+  case "sne":  gen("sne",  "!=="); break;
+}