[njs] Math.pow() method fix.

[Valentin Bartenev]

details:   http://hg.nginx.org/njs/rev/db0d8e2a4928
branches:  
changeset: 280:db0d8e2a4928
user:      Valentin Bartenev <vbart at nginx.com>
date:      Thu Dec 08 01:52:41 2016 +0300
description:
Math.pow() method fix.

diffstat:

 njs/njs_math.c           |  12 ++++++++-
 njs/test/njs_unit_test.c |  60 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 1 deletions(-)

diffs (92 lines):

diff -r 6a60530c7b6b -r db0d8e2a4928 njs/njs_math.c
--- a/njs/njs_math.c	Thu Dec 08 19:50:03 2016 +0300
+++ b/njs/njs_math.c	Thu Dec 08 01:52:41 2016 +0300
@@ -578,7 +578,17 @@ njs_object_math_pow(njs_vm_t *vm, njs_va
         base = args[1].data.u.number;
         exponent = args[2].data.u.number;
 
-        num = pow(base, exponent);
+        /*
+         * Accordig to ECMA-262 the result of Math.pow(+/-1, +/-Infinity)
+         * should be NaN.
+         */
+
+        if (fabs(base) != 1 || !isinf(exponent)) {
+            num = pow(base, exponent);
+
+        } else {
+            num = NAN;
+        }
 
     } else {
         num = NAN;
diff -r 6a60530c7b6b -r db0d8e2a4928 njs/test/njs_unit_test.c
--- a/njs/test/njs_unit_test.c	Thu Dec 08 19:50:03 2016 +0300
+++ b/njs/test/njs_unit_test.c	Thu Dec 08 01:52:41 2016 +0300
@@ -6215,6 +6215,66 @@ static njs_unit_test_t  njs_test[] =
     { nxt_string("Math.pow()"),
       nxt_string("NaN") },
 
+    { nxt_string("Math.pow('a', -0)"),
+      nxt_string("1") },
+
+    { nxt_string("Math.pow(1.1, Infinity)"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow(-1.1, -Infinity)"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow(-1, Infinity)"),
+      nxt_string("NaN") },
+
+    { nxt_string("Math.pow(1, -Infinity)"),
+      nxt_string("NaN") },
+
+    { nxt_string("Math.pow(-0.9, Infinity)"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow(0.9, -Infinity)"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow('Infinity', 0.1)"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow(Infinity, '-0.1')"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow(-Infinity, 3)"),
+      nxt_string("-Infinity") },
+
+    { nxt_string("Math.pow('-Infinity', '3.1')"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow(-Infinity, '-3')"),
+      nxt_string("-0") },
+
+    { nxt_string("Math.pow('-Infinity', -2)"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow('0', 0.1)"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow(0, '-0.1')"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow(-0, 3)"),
+      nxt_string("-0") },
+
+    { nxt_string("Math.pow('-0', '3.1')"),
+      nxt_string("0") },
+
+    { nxt_string("Math.pow(-0, '-3')"),
+      nxt_string("-Infinity") },
+
+    { nxt_string("Math.pow('-0', -2)"),
+      nxt_string("Infinity") },
+
+    { nxt_string("Math.pow(-3, 0.1)"),
+      nxt_string("NaN") },
+
     { nxt_string("var a = Math.random(); a >= 0 && a < 1"),
       nxt_string("true") },