[torque] add hex literals

Bug: v8:7793
Change-Id: I69e27cb1e8477ca0d64ad7a96ab256cae96339f4
Reviewed-on: https://chromium-review.googlesource.com/1086801Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53521}

src/torque/Torque.g4

@@ -116,6 +116,7 @@ DECIMAL_LITERAL
         : MINUS? DECIMAL_INTEGER_LITERAL '.' DECIMAL_DIGIT* EXPONENT_PART?
         | MINUS? '.' DECIMAL_DIGIT+ EXPONENT_PART?
         | MINUS? DECIMAL_INTEGER_LITERAL EXPONENT_PART?
+        | MINUS? '0x' [0-9a-fA-F]+
         ;
 
 type : CONSTEXPR? IDENTIFIER

test/cctest/torque/test-torque.cc

@@ -170,6 +170,18 @@ TEST(TestUnsafeCast) {
   ft.CheckCall(ft.true_value());
 }
 
+TEST(TestHexLiteral) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+  CodeAssemblerTester asm_tester(isolate, 0);
+  TestBuiltinsFromDSLAssembler m(asm_tester.state());
+  {
+    m.TestHexLiteral();
+    m.Return(m.UndefinedConstant());
+  }
+  FunctionTester ft(asm_tester.GenerateCode(), 0);
+  ft.Call();
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8

test/torque/test-torque.tq

@@ -203,4 +203,9 @@ module test {
     }
     return False;
   }
+
+  macro TestHexLiteral() {
+    check(convert<intptr>(0xffff) + 1 == 0x10000);
+    check(convert<intptr>(-0xffff) == -65535);
+  }
 }