[Truffle] String#num_bytes= and primitive :string_resize_capacity

Author: chrisseaton

spec/truffle/tags/rubysl/rubysl-stringio/spec/append_tags.txt

@@ -1,8 +1,2 @@
-fails:StringIO#<< when passed [Object] returns self
 fails:StringIO#<< when passed [Object] writes the passed argument onto self
 fails:StringIO#<< when passed [Object] writes the passed argument at the current position
-fails:StringIO#<< when passed [Object] pads self with \000 when the current position is after the end
-fails:StringIO#<< when passed [Object] taints self's String when the passed argument is tainted
-fails:StringIO#<< when passed [Object] does not taint self when the passed argument is tainted
-fails:StringIO#<< when passed [Object] updates self's position
-fails:StringIO#<< when passed [Object] tries to convert the passed argument to a String using #to_s

spec/truffle/tags/rubysl/rubysl-stringio/spec/close_read_tags.txt

@@ -1,10 +1,7 @@
 fails:StringIO#print prints $_ when passed no arguments
 fails:StringIO#print prints the passed arguments to self
 fails:StringIO#print tries to convert the passed Object to a String using #to_s
-fails:StringIO#print returns nil
 fails:StringIO#print pads self with \000 when the current position is after the end
-fails:StringIO#print honors the output record separator global
 fails:StringIO#print updates the current position
-fails:StringIO#print correctly updates the current position when honoring the output record separator global
 fails:StringIO#print when in append mode appends the passed argument to the end of self
 fails:StringIO#print when in append mode correctly updates self's position

spec/truffle/tags/rubysl/rubysl-stringio/spec/print_tags.txt

@@ -1,4 +1 @@
-fails:StringIO#printf returns nil
-fails:StringIO#printf pads self with \000 when the current position is after the end
 fails:StringIO#printf performs format conversion
-fails:StringIO#printf updates the current position

spec/truffle/tags/rubysl/rubysl-stringio/spec/printf_tags.txt

@@ -6,5 +6,4 @@ fails:StringIO#reopen when passed [Object, Integer] raises an Errno::EACCES when
 fails:StringIO#reopen when passed [Object, Integer] raises a TypeError when trying to reopen self with a frozen String in truncate-mode
 fails:StringIO#reopen when passed [Object, Integer] raises a RuntimeError when trying to reopen self with a frozen String in truncate-mode
 fails:StringIO#reopen when passed [Object, Integer] does not raise IOError when passed a frozen String in read-mode
-fails:StringIO#reopen reopens a stream when given a String argument
 fails:StringIO#reopen does not truncate the content even when the StringIO argument is in the truncate mode

spec/truffle/tags/rubysl/rubysl-stringio/spec/putc_tags.txt

@@ -2213,4 +2213,22 @@ public static ByteList swapcase(RubyString string) {
         }
     }
 
+    @CoreMethod(names = "_set_num_bytes", required = 1)
+    public abstract static class SetNumBytesNode extends CoreMethodNode {
+
+        public SetNumBytesNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public SetNumBytesNode(SetNumBytesNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public RubyString setNumBytes(RubyString string, int count) {
+            string.getByteList().view(0, count);
+            return string;
+        }
+    }
+
 }