Run size_of tests with test-stylo.

MozReview-Commit-ID: KapDMqX6OjH

components/style/properties/data.py

@@ -211,11 +211,13 @@ class PropertiesData(object):
 
         In this situation, the `product` value is ignored while choosing
         which shorthands and longhands to generate; and instead all properties for
-        which code exists for either servo or stylo are generated.
+        which code exists for either servo or stylo are generated. Note that we skip
+        this behavior when the style crate is being built in gecko mode, because we
+        need manual glue for such properties and we don't have it.
     """
     def __init__(self, product, testing):
         self.product = product
-        self.testing = testing
+        self.testing = testing and product != "gecko"
         self.style_structs = []
         self.current_style_struct = None
         self.longhands = []

components/style/properties/properties.mako.rs

@@ -2387,17 +2387,62 @@ macro_rules! longhand_properties_idents {
     }
 }
 
-/// Retuns all longhands SpecifiedValue sizes. This is used in unit tests.
+/// Testing function to check the size of a PropertyDeclaration. We implement
+/// this here so that the code can be used by both servo and stylo unit tests.
+/// This is important because structs can have different sizes in stylo and
+/// servo.
 #[cfg(feature = "testing")]
-pub fn specified_value_sizes() -> Vec<(&'static str, usize, bool)> {
+pub fn test_size_of_property_declaration() {
     use std::mem::size_of;
-    let mut sizes = vec![];
 
+    let old = 48;
+    let new = size_of::<PropertyDeclaration>();
+    if new < old {
+        panic!("Your changes have decreased the stack size of PropertyDeclaration enum from {} to {}. \
+                Good work! Please update the size in components/style/properties/properties.mako.rs.",
+                old, new)
+    } else if new > old {
+        panic!("Your changes have increased the stack size of PropertyDeclaration enum from {} to {}. \
+                These enum is present in large quantities in the style, and increasing the size \
+                may negatively affect style system performance. Please consider using `boxed=\"True\"` in \
+                the longhand If you feel that the increase is necessary, update to the new size in \
+                components/style/properties/properties.mako.rs.",
+                old, new)
+    }
+}
+
+/// Testing function to check the size of all SpecifiedValues.
+#[cfg(feature = "testing")]
+pub fn test_size_of_specified_values() {
+    use std::mem::size_of;
+    let threshold = 32;
+
+    let mut longhands = vec![];
     % for property in data.longhands:
-        sizes.push(("${property.name}",
-                    size_of::<longhands::${property.ident}::SpecifiedValue>(),
-                    ${"true" if property.boxed else "false"}));
+        longhands.push(("${property.name}",
+                       size_of::<longhands::${property.ident}::SpecifiedValue>(),
+                       ${"true" if property.boxed else "false"}));
     % endfor
 
-    sizes
+    let mut failing_messages = vec![];
+
+    for specified_value in longhands {
+        if specified_value.1 > threshold && !specified_value.2 {
+            failing_messages.push(
+                format!("Your changes have increased the size of {} SpecifiedValue to {}. The threshold is \
+                        currently {}. SpecifiedValues affect size of PropertyDeclaration enum and \
+                        increasing the size may negative affect style system performance. Please consider \
+                        using `boxed=\"True\"` in this longhand.",
+                        specified_value.0, specified_value.1, threshold));
+        } else if specified_value.1 <= threshold && specified_value.2 {
+            failing_messages.push(
+                format!("Your changes have decreased the size of {} SpecifiedValue to {}. Good work! \
+                        The threshold is currently {}. Please consider removing `boxed=\"True\"` from this longhand.",
+                        specified_value.0, specified_value.1, threshold));
+        }
+    }
+
+    if !failing_messages.is_empty() {
+        panic!("{}", failing_messages.join("\n\n"));
+    }
 }

ports/geckolib/Cargo.toml

@@ -11,6 +11,7 @@ crate-type = ["staticlib", "rlib"]
 
 [features]
 bindgen = ["style/use_bindgen"]
+testing = ["style/testing"]
 
 [dependencies]
 atomic_refcell = "0.1"

python/servo/testing_commands.py

@@ -300,7 +300,7 @@ def test_stylo(self, release=False):
         release = ["--release"] if release else []
         ret = 0
         with cd(path.join("ports", "geckolib")):
-            ret = call(["cargo", "test", "-p", "stylo_tests"] + release, env=env)
+            ret = call(["cargo", "test", "-p", "stylo_tests", "--features", "testing"] + release, env=env)
         if ret != 0:
             return ret
         with cd(path.join("ports", "geckolib")):

tests/unit/style/size_of.rs

@@ -2,51 +2,12 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use std::mem::size_of;
-use style::properties::{PropertyDeclaration, specified_value_sizes};
-
 #[test]
 fn size_of_property_declaration() {
-    let old = 48;
-    let new = size_of::<PropertyDeclaration>();
-    if new < old {
-        panic!("Your changes have decreased the stack size of PropertyDeclaration enum from {} to {}. \
-                Good work! Please update the size in tests/unit/style/size_of.rs.",
-                old, new)
-    } else if new > old {
-        panic!("Your changes have increased the stack size of PropertyDeclaration enum from {} to {}. \
-                These enum is present in large quantities in the style, and increasing the size \
-                may negatively affect style system performance. Please consider using `boxed=\"True\"` in \
-                the longhand If you feel that the increase is necessary, update to the new size in \
-                tests/unit/style/size_of.rs.",
-                old, new)
-    }
+    ::style::properties::test_size_of_property_declaration();
 }
 
 #[test]
 fn size_of_specified_values() {
-    let threshold = 32;
-    let longhands = specified_value_sizes();
-
-    let mut failing_messages = vec![];
-
-    for specified_value in longhands {
-        if specified_value.1 > threshold && !specified_value.2 {
-            failing_messages.push(
-                format!("Your changes have increased the size of {} SpecifiedValue to {}. The threshold is \
-                        currently {}. SpecifiedValues affect size of PropertyDeclaration enum and \
-                        increasing the size may negative affect style system performance. Please consider \
-                        using `boxed=\"True\"` in this longhand.",
-                        specified_value.0, specified_value.1, threshold));
-        } else if specified_value.1 <= threshold && specified_value.2 {
-            failing_messages.push(
-                format!("Your changes have decreased the size of {} SpecifiedValue to {}. Good work! \
-                        The threshold is currently {}. Please consider removing `boxed=\"True\"` from this longhand.",
-                        specified_value.0, specified_value.1, threshold));
-        }
-    }
-
-    if !failing_messages.is_empty() {
-        panic!("{}", failing_messages.join("\n\n"));
-    }
+    ::style::properties::test_size_of_specified_values();
 }

tests/unit/stylo/Cargo.toml

@@ -11,6 +11,9 @@ name = "stylo_tests"
 path = "lib.rs"
 doctest = false
 
+[features]
+testing = ["style/testing"]
+
 [dependencies]
 app_units = "0.4"
 atomic_refcell = "0.1"

tests/unit/stylo/lib.rs

@@ -19,6 +19,7 @@ extern crate style;
 extern crate style_traits;
 
 mod sanity_checks;
+mod size_of;
 
 #[path = "../../../ports/geckolib/stylesheet_loader.rs"]
 mod stylesheet_loader;

tests/unit/stylo/size_of.rs

@@ -0,0 +1,13 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#[test]
+fn size_of_property_declaration() {
+    ::style::properties::test_size_of_property_declaration();
+}
+
+#[test]
+fn size_of_specified_values() {
+    ::style::properties::test_size_of_specified_values();
+}