Implement rb_hash_bulk_insert

Author: Th3-M4jor

CHANGELOG.md

@@ -19,6 +19,7 @@ Compatibility:
 * Implement `rb_str_strlen()` (#3697, @Th3-M4jor).
 * Support `Time.new` with String argument and error when invalid (#3693, @rwstauner).
 * Implement `rb_enc_interned_str()` (#3703, @Th3-M4jor).
+* Implement `rb_hash_bulk_insert()` (#3705, @Th3-M4jor).
 
 Performance:
 

lib/cext/include/truffleruby/truffleruby-abi-version.h

@@ -20,6 +20,6 @@
 // $RUBY_VERSION must be the same as TruffleRuby.LANGUAGE_VERSION.
 // $ABI_NUMBER starts at 1 and is incremented for every ABI-incompatible change.
 
-#define TRUFFLERUBY_ABI_VERSION "3.2.4.6"
+#define TRUFFLERUBY_ABI_VERSION "3.2.4.7"
 
 #endif

spec/ruby/optional/capi/ext/hash_spec.c

@@ -134,6 +134,20 @@ VALUE hash_spec_compute_a_hash_code(VALUE self, VALUE seed) {
   return ULONG2NUM(h);
 }
 
+VALUE hash_spec_rb_hash_bulk_insert(VALUE self, VALUE array_len, VALUE array, VALUE hash) {
+  VALUE* ptr;
+  
+  if (array == Qnil) {
+    ptr = NULL;
+  } else {
+    ptr = RARRAY_PTR(array);
+  }
+
+  long len = FIX2LONG(array_len);
+  rb_hash_bulk_insert(len, ptr, hash);
+  return Qnil;
+}
+
 void Init_hash_spec(void) {
   VALUE cls = rb_define_class("CApiHashSpecs", rb_cObject);
   rb_define_method(cls, "rb_hash", hash_spec_rb_hash, 1);
@@ -162,6 +176,7 @@ void Init_hash_spec(void) {
   rb_define_method(cls, "rb_hash_size", hash_spec_rb_hash_size, 1);
   rb_define_method(cls, "rb_hash_set_ifnone", hash_spec_rb_hash_set_ifnone, 2);
   rb_define_method(cls, "compute_a_hash_code", hash_spec_compute_a_hash_code, 1);
+  rb_define_method(cls, "rb_hash_bulk_insert", hash_spec_rb_hash_bulk_insert, 3);
 }
 
 #ifdef __cplusplus

spec/ruby/optional/capi/hash_spec.rb

@@ -194,6 +194,61 @@
     end
   end
 
+  describe "rb_hash_bulk_insert" do
+    it 'inserts key-value pairs into the hash' do
+      arr = [:a, 1, :b, 2, :c, 3]
+      hash = {}
+
+      @s.rb_hash_bulk_insert(arr.length, arr, hash)
+
+      hash.should == {a: 1, b: 2, c: 3}
+    end
+
+    it 'overwrites existing keys' do
+      arr = [:a, 4, :b, 5, :c, 6]
+      hash = {a: 1, b: 2}
+
+      @s.rb_hash_bulk_insert(arr.length, arr, hash)
+
+      hash.should == {a: 4, b: 5, c: 6}
+    end
+
+    it 'uses the last key in the array if it appears multiple times' do
+      arr = [:a, 1, :b, 2, :a, 3]
+      hash = {}
+
+      @s.rb_hash_bulk_insert(arr.length, arr, hash)
+
+      hash.should == {a: 3, b: 2}
+    end
+
+    it 'allows the array to be NULL if the length is zero' do
+      hash = {}
+
+      @s.rb_hash_bulk_insert(0, nil, hash)
+
+      hash.should == {}
+    end
+
+    it 'does not include any keys after the given length' do
+      arr = [:a, 1, :b, 2, :c, 3, :d, 4]
+      hash = {}
+
+      @s.rb_hash_bulk_insert(arr.length - 2, arr, hash)
+
+      hash.should == {a: 1, b: 2, c: 3}
+    end
+
+    it 'does not modify the hash if the length is zero' do
+      arr = []
+      hash = {a: 1, b: 2}
+
+      @s.rb_hash_bulk_insert(arr.length, arr, hash)
+
+      hash.should == {a: 1, b: 2}
+    end
+  end
+
   describe "rb_hash_size" do
     it "returns the size of the hash" do
       hsh = {fast: 'car', good: 'music'}

src/main/c/cext/hash.c

@@ -100,6 +100,14 @@ void rb_hash_foreach(VALUE hash, int (*func)(VALUE key, VALUE val, VALUE arg), V
   polyglot_invoke(RUBY_CEXT, "rb_hash_foreach", rb_tr_unwrap(hash), func, (void*)arg);
 }
 
+void rb_hash_bulk_insert(long n, const VALUE *values, VALUE hash) {
+  void* unwrapped_hash = rb_tr_unwrap(hash);
+
+  for (long i = 0; i < n; i += 2) {
+    polyglot_invoke(unwrapped_hash, "[]=", rb_tr_unwrap(values[i]), rb_tr_unwrap(values[i + 1]));
+  }
+}
+
 VALUE rb_hash_size(VALUE hash) {
   return RUBY_INVOKE(hash, "size");
 }