From: Ole André Vadla Ravnås <oleavr@gmail.com>
Date: Tue, 14 Mar 2017 18:17:15 +0000 (+0100)
Subject: gvariant: Optimize (de)serialization of arrays with type-signature "ay"
X-Git-Tag: 0.34.11~18
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0fa25d16ae9515207b5840a37bd7ef36418a90d2;p=thirdparty%2Fvala.git

gvariant: Optimize (de)serialization of arrays with type-signature "ay"

https://bugzilla.gnome.org/show_bug.cgi?id=772426
---

diff --git a/codegen/valagvariantmodule.vala b/codegen/valagvariantmodule.vala
index f3113f4f4..9cf642de1 100644
--- a/codegen/valagvariantmodule.vala
+++ b/codegen/valagvariantmodule.vala
@@ -264,6 +264,10 @@ public class Vala.GVariantModule : GAsyncModule {
 	}
 
 	CCodeExpression deserialize_array (ArrayType array_type, CCodeExpression variant_expr, CCodeExpression? expr) {
+		if (array_type.rank == 1 && get_type_signature (array_type) == "ay") {
+			return deserialize_buffer_array (array_type, variant_expr, expr);
+		}
+
 		string temp_name = "_tmp%d_".printf (next_temp_var_id++);
 
 		var new_call = new CCodeFunctionCall (new CCodeIdentifier ("g_new"));
@@ -343,6 +347,29 @@ public class Vala.GVariantModule : GAsyncModule {
 		}
 	}
 
+	CCodeExpression deserialize_buffer_array (ArrayType array_type, CCodeExpression variant_expr, CCodeExpression? expr) {
+		string temp_name = "_tmp%d_".printf (next_temp_var_id++);
+
+		var get_data_call = new CCodeFunctionCall (new CCodeIdentifier ("g_variant_get_data"));
+		get_data_call.add_argument (variant_expr);
+
+		var get_size_call = new CCodeFunctionCall (new CCodeIdentifier ("g_variant_get_size"));
+		get_size_call.add_argument (variant_expr);
+		ccode.add_declaration ("gsize", new CCodeVariableDeclarator (temp_name + "_length", get_size_call));
+		var length = new CCodeIdentifier (temp_name + "_length");
+
+		var dup_call = new CCodeFunctionCall (new CCodeIdentifier ("g_memdup"));
+		dup_call.add_argument (get_data_call);
+		dup_call.add_argument (length);
+
+		ccode.add_declaration (get_ccode_name (array_type), new CCodeVariableDeclarator (temp_name, dup_call));
+		if (expr != null) {
+			ccode.add_assignment (get_array_length (expr, 1), length);
+		}
+
+		return new CCodeIdentifier (temp_name);
+	}
+
 	CCodeExpression? deserialize_struct (Struct st, CCodeExpression variant_expr) {
 		string temp_name = "_tmp%d_".printf (next_temp_var_id++);
 		string subiter_name = "_tmp%d_".printf (next_temp_var_id++);
@@ -578,6 +605,10 @@ public class Vala.GVariantModule : GAsyncModule {
 	}
 
 	CCodeExpression? serialize_array (ArrayType array_type, CCodeExpression array_expr) {
+		if (array_type.rank == 1 && get_type_signature (array_type) == "ay") {
+			return serialize_buffer_array (array_type, array_expr);
+		}
+
 		string array_iter_name = "_tmp%d_".printf (next_temp_var_id++);
 
 		ccode.add_declaration (get_ccode_name (array_type), new CCodeVariableDeclarator (array_iter_name));
@@ -631,6 +662,28 @@ public class Vala.GVariantModule : GAsyncModule {
 		return builder_end;
 	}
 
+	CCodeExpression serialize_buffer_array (ArrayType array_type, CCodeExpression array_expr) {
+		string buffer_name = "_tmp%d_".printf (next_temp_var_id++);
+
+		var gvariant_type = new CCodeFunctionCall (new CCodeIdentifier ("G_VARIANT_TYPE"));
+		gvariant_type.add_argument (new CCodeConstant ("\"%s\"".printf (get_type_signature (array_type))));
+
+		var dup_call = new CCodeFunctionCall (new CCodeIdentifier ("g_memdup"));
+		dup_call.add_argument (array_expr);
+		dup_call.add_argument (get_array_length (array_expr, 1));
+		ccode.add_declaration (get_ccode_name (array_type), new CCodeVariableDeclarator (buffer_name, dup_call));
+
+		var new_call = new CCodeFunctionCall (new CCodeIdentifier ("g_variant_new_from_data"));
+		new_call.add_argument (gvariant_type);
+		new_call.add_argument (new CCodeIdentifier (buffer_name));
+		new_call.add_argument (get_array_length (array_expr, 1));
+		new_call.add_argument (new CCodeConstant ("TRUE"));
+		new_call.add_argument (new CCodeIdentifier ("g_free"));
+		new_call.add_argument (new CCodeIdentifier (buffer_name));
+
+		return new_call;
+	}
+
 	CCodeExpression? serialize_struct (Struct st, CCodeExpression struct_expr) {
 		string builder_name = "_tmp%d_".printf (next_temp_var_id++);
 
diff --git a/tests/Makefile.am b/tests/Makefile.am
index e78fbd2f2..2889ffea9 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -43,6 +43,7 @@ TESTS = \
 	basic-types/bug761307.vala \
 	basic-types/bug761736.vala \
 	basic-types/bug771626.test \
+	basic-types/bug772426.vala \
 	basic-types/bug777697.test \
 	namespaces.vala \
 	methods/lambda.vala \
diff --git a/tests/basic-types/bug772426.vala b/tests/basic-types/bug772426.vala
new file mode 100644
index 000000000..43094e8df
--- /dev/null
+++ b/tests/basic-types/bug772426.vala
@@ -0,0 +1,18 @@
+int BUFFER_LENGTH = 1048576;
+
+void main () {
+	// Some reasonably sized memory block
+	void* buffer_p = malloc (BUFFER_LENGTH);
+	Memory.set (buffer_p, 0x55555555, BUFFER_LENGTH);
+	unowned uint8[] buffer = (uint8[]) buffer_p;
+	buffer.length = BUFFER_LENGTH;
+
+	// Serialize
+	Variant v = buffer;
+
+	// Deserialize
+	var result = (uint8[]) v;
+
+	assert (Memory.cmp (buffer, result, BUFFER_LENGTH) == 0);
+	free (buffer_p);
+}