Enable -Wconversion (facebook#39291)

Summary: X-link: facebook/yoga#1359 This enables clang warnings around potentially unsafe conversions, such as those with mismatched signedness, or ones which may lead to truncation. This should catch issues in local development which create errors for MSVC (e.g. Dash), who's default `/W3` includes warnings akin to `-Wshorten-64-to-32`. This full set of warnings here is a tad spammy, but probably more useful than not. Changelog: [Internal] Reviewed By: yungsters Differential Revision: D48954777
NickGerleman · Sep 5, 2023 · 31ef368 · 31ef368
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Showing 9 changed files with 101 additions and 86 deletions.
diff --git a/packages/react-native/ReactCommon/yoga/cmake/project-defaults.cmake b/packages/react-native/ReactCommon/yoga/cmake/project-defaults.cmake
@@ -35,6 +35,7 @@ add_compile_options(
     -Wall
     -Wextra
     -Werror
+    -Wconversion
     # Disable RTTI
     $<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>
     # Use -O2 (prioritize speed)

diff --git a/packages/react-native/ReactCommon/yoga/yoga/algorithm/CalculateLayout.cpp b/packages/react-native/ReactCommon/yoga/yoga/algorithm/CalculateLayout.cpp
@@ -823,8 +823,8 @@ static void zeroOutLayoutRecursively(
     yoga::Node* const node,
     void* layoutContext) {
   node->getLayout() = {};
-  node->setLayoutDimension(0, 0);
-  node->setLayoutDimension(0, 1);
+  node->setLayoutDimension(0, YGDimensionWidth);
+  node->setLayoutDimension(0, YGDimensionHeight);
   node->setHasNewLayout(true);
 
   node->iterChildrenAfterCloningIfNeeded(
@@ -1488,19 +1488,19 @@ static void YGJustifyMainAxis(
           betweenMainDim +=
               yoga::maxOrDefined(
                   collectedFlexItemsValues.remainingFreeSpace, 0) /
-              (collectedFlexItemsValues.itemsOnLine - 1);
+              static_cast<float>(collectedFlexItemsValues.itemsOnLine - 1);
         }
         break;
       case YGJustifySpaceEvenly:
         // Space is distributed evenly across all elements
         leadingMainDim = collectedFlexItemsValues.remainingFreeSpace /
-            (collectedFlexItemsValues.itemsOnLine + 1);
+            static_cast<float>(collectedFlexItemsValues.itemsOnLine + 1);
         betweenMainDim += leadingMainDim;
         break;
       case YGJustifySpaceAround:
         // Space on the edges is half of the space between elements
         leadingMainDim = 0.5f * collectedFlexItemsValues.remainingFreeSpace /
-            collectedFlexItemsValues.itemsOnLine;
+            static_cast<float>(collectedFlexItemsValues.itemsOnLine);
         betweenMainDim += leadingMainDim * 2;
         break;
       case YGJustifyFlexStart:
@@ -1550,7 +1550,7 @@ static void YGJustifyMainAxis(
         if (child->marginLeadingValue(mainAxis).unit == YGUnitAuto) {
           collectedFlexItemsValues.mainDim +=
               collectedFlexItemsValues.remainingFreeSpace /
-              numberOfAutoMarginsOnCurrentLine;
+              static_cast<float>(numberOfAutoMarginsOnCurrentLine);
         }
 
         if (performLayout) {
@@ -1563,7 +1563,7 @@ static void YGJustifyMainAxis(
         if (child->marginTrailingValue(mainAxis).unit == YGUnitAuto) {
           collectedFlexItemsValues.mainDim +=
               collectedFlexItemsValues.remainingFreeSpace /
-              numberOfAutoMarginsOnCurrentLine;
+              static_cast<float>(numberOfAutoMarginsOnCurrentLine);
         }
         bool canSkipFlex =
             !performLayout && measureModeCrossDim == YGMeasureModeExactly;
@@ -1890,7 +1890,7 @@ static void calculateLayoutImpl(
   if (childCount > 1) {
     totalMainDim +=
         node->getGapForAxis(mainAxis, availableInnerCrossDim).unwrap() *
-        (childCount - 1);
+        static_cast<float>(childCount - 1);
   }
 
   const bool mainAxisOverflows =
@@ -2261,22 +2261,26 @@ static void calculateLayoutImpl(
           break;
         case YGAlignStretch:
           if (availableInnerCrossDim > totalLineCrossDim) {
-            crossDimLead = remainingAlignContentDim / lineCount;
+            crossDimLead =
+                remainingAlignContentDim / static_cast<float>(lineCount);
           }
           break;
         case YGAlignSpaceAround:
           if (availableInnerCrossDim > totalLineCrossDim) {
-            currentLead += remainingAlignContentDim / (2 * lineCount);
+            currentLead +=
+                remainingAlignContentDim / (2 * static_cast<float>(lineCount));
             if (lineCount > 1) {
-              crossDimLead = remainingAlignContentDim / lineCount;
+              crossDimLead =
+                  remainingAlignContentDim / static_cast<float>(lineCount);
             }
           } else {
             currentLead += remainingAlignContentDim / 2;
           }
           break;
         case YGAlignSpaceBetween:
           if (availableInnerCrossDim > totalLineCrossDim && lineCount > 1) {
-            crossDimLead = remainingAlignContentDim / (lineCount - 1);
+            crossDimLead =
+                remainingAlignContentDim / static_cast<float>(lineCount - 1);
           }
           break;
         case YGAlignAuto:
@@ -2843,11 +2847,11 @@ bool calculateLayoutInternal(
     layout->lastOwnerDirection = ownerDirection;
 
     if (cachedResults == nullptr) {
-      if (layout->nextCachedMeasurementsIndex + 1 >
-          (uint32_t) layoutMarkerData.maxMeasureCache) {
-        layoutMarkerData.maxMeasureCache =
-            layout->nextCachedMeasurementsIndex + 1;
-      }
+
+      layoutMarkerData.maxMeasureCache = std::max(
+          layoutMarkerData.maxMeasureCache,
+          layout->nextCachedMeasurementsIndex + 1u);
+
       if (layout->nextCachedMeasurementsIndex ==
           LayoutResults::MaxCachedMeasurements) {
         if (gPrintChanges) {

diff --git a/packages/react-native/ReactCommon/yoga/yoga/bits/NumericBitfield.h b/packages/react-native/ReactCommon/yoga/yoga/bits/NumericBitfield.h
@@ -15,12 +15,12 @@
 
 namespace facebook::yoga::details {
 
-constexpr size_t log2ceilFn(size_t n) {
+constexpr uint8_t log2ceilFn(uint8_t n) {
   return n < 1 ? 0 : (1 + log2ceilFn(n / 2));
 }
 
-constexpr int mask(size_t bitWidth, size_t index) {
-  return ((1 << bitWidth) - 1) << index;
+constexpr uint32_t mask(uint8_t bitWidth, uint8_t index) {
+  return ((1u << bitWidth) - 1u) << index;
 }
 
 } // namespace facebook::yoga::details
@@ -29,38 +29,31 @@ namespace facebook::yoga {
 
 // The number of bits necessary to represent enums defined with YG_ENUM_SEQ_DECL
 template <typename Enum>
-constexpr size_t minimumBitCount() {
+constexpr uint8_t minimumBitCount() {
   static_assert(
       enums::count<Enum>() > 0, "Enums must have at least one entries");
   return details::log2ceilFn(enums::count<Enum>() - 1);
 }
 
 template <typename Enum>
-constexpr Enum getEnumData(int flags, size_t index) {
+constexpr Enum getEnumData(uint32_t flags, uint8_t index) {
   return static_cast<Enum>(
       (flags & details::mask(minimumBitCount<Enum>(), index)) >> index);
 }
 
 template <typename Enum>
-void setEnumData(uint32_t& flags, size_t index, int newValue) {
-  flags = (flags & ~details::mask(minimumBitCount<Enum>(), index)) |
-      ((newValue << index) & (details::mask(minimumBitCount<Enum>(), index)));
-}
-
-template <typename Enum>
-void setEnumData(uint8_t& flags, size_t index, int newValue) {
+void setEnumData(uint32_t& flags, uint8_t index, uint32_t newValue) {
   flags =
       (flags &
-       ~static_cast<uint8_t>(details::mask(minimumBitCount<Enum>(), index))) |
-      ((newValue << index) &
-       (static_cast<uint8_t>(details::mask(minimumBitCount<Enum>(), index))));
+       ~static_cast<uint32_t>(details::mask(minimumBitCount<Enum>(), index))) |
+      ((newValue << index) & (details::mask(minimumBitCount<Enum>(), index)));
 }
 
-constexpr bool getBooleanData(int flags, size_t index) {
+constexpr bool getBooleanData(uint32_t flags, uint8_t index) {
   return (flags >> index) & 1;
 }
 
-inline void setBooleanData(uint8_t& flags, size_t index, bool value) {
+inline void setBooleanData(uint32_t& flags, uint8_t index, bool value) {
   if (value) {
     flags |= 1 << index;
   } else {

diff --git a/packages/react-native/ReactCommon/yoga/yoga/debug/NodeToString.cpp b/packages/react-native/ReactCommon/yoga/yoga/debug/NodeToString.cpp
@@ -33,7 +33,7 @@ static void appendFormattedString(std::string& str, const char* fmt, ...) {
   va_start(args, fmt);
   va_list argsCopy;
   va_copy(argsCopy, args);
-  std::vector<char> buf(1 + vsnprintf(NULL, 0, fmt, args));
+  std::vector<char> buf(1 + static_cast<size_t>(vsnprintf(NULL, 0, fmt, args)));
   va_end(args);
   vsnprintf(buf.data(), buf.size(), fmt, argsCopy);
   va_end(argsCopy);
@@ -96,7 +96,7 @@ static void appendEdges(
   } else {
     for (int edge = YGEdgeLeft; edge != YGEdgeAll; ++edge) {
       std::string str = key + "-" + YGEdgeToString(static_cast<YGEdge>(edge));
-      appendNumberIfNotZero(base, str, edges[edge]);
+      appendNumberIfNotZero(base, str, edges[static_cast<size_t>(edge)]);
     }
   }
 }

diff --git a/packages/react-native/ReactCommon/yoga/yoga/event/event.h b/packages/react-native/ReactCommon/yoga/yoga/event/event.h
@@ -38,7 +38,7 @@ enum struct LayoutPassReason : int {
 struct LayoutData {
   int layouts;
   int measures;
-  int maxMeasureCache;
+  uint32_t maxMeasureCache;
   int cachedLayouts;
   int cachedMeasures;
   int measureCallbacks;

diff --git a/packages/react-native/ReactCommon/yoga/yoga/node/LayoutResults.h b/packages/react-native/ReactCommon/yoga/yoga/node/LayoutResults.h
@@ -15,6 +15,14 @@
 
 namespace facebook::yoga {
 
+#pragma pack(push)
+#pragma pack(1)
+struct LayoutResultFlags {
+  uint8_t direction : 2;
+  bool hadOverflow : 1;
+};
+#pragma pack(pop)
+
 struct LayoutResults {
   // This value was chosen based on empirical data:
   // 98% of analyzed layouts require less than 8 entries.
@@ -27,10 +35,7 @@ struct LayoutResults {
   std::array<float, 4> padding = {};
 
 private:
-  static constexpr size_t directionOffset = 0;
-  static constexpr size_t hadOverflowOffset =
-      directionOffset + minimumBitCount<YGDirection>();
-  uint8_t flags = 0;
+  LayoutResultFlags flags_{};
 
 public:
   uint32_t computedFlexBasisGeneration = 0;
@@ -48,17 +53,15 @@ struct LayoutResults {
   CachedMeasurement cachedLayout{};
 
   YGDirection direction() const {
-    return getEnumData<YGDirection>(flags, directionOffset);
+    return static_cast<YGDirection>(flags_.direction);
   }
 
   void setDirection(YGDirection direction) {
-    setEnumData<YGDirection>(flags, directionOffset, direction);
+    flags_.direction = static_cast<uint8_t>(direction);
   }
 
-  bool hadOverflow() const { return getBooleanData(flags, hadOverflowOffset); }
-  void setHadOverflow(bool hadOverflow) {
-    setBooleanData(flags, hadOverflowOffset, hadOverflow);
-  }
+  bool hadOverflow() const { return flags_.hadOverflow; }
+  void setHadOverflow(bool hadOverflow) { flags_.hadOverflow = hadOverflow; }
 
   bool operator==(LayoutResults layout) const;
   bool operator!=(LayoutResults layout) const { return !(*this == layout); }

diff --git a/packages/react-native/ReactCommon/yoga/yoga/node/Node.cpp b/packages/react-native/ReactCommon/yoga/yoga/node/Node.cpp
@@ -6,6 +6,7 @@
  */
 
 #include <algorithm>
+#include <cstddef>
 #include <iostream>
 
 #include <yoga/algorithm/FlexDirection.h>
@@ -264,16 +265,16 @@ YOGA_EXPORT void Node::setMeasureFunc(MeasureWithContextFn measureFunc) {
   setMeasureFunc(m);
 }
 
-void Node::replaceChild(Node* child, uint32_t index) {
+void Node::replaceChild(Node* child, size_t index) {
   children_[index] = child;
 }
 
 void Node::replaceChild(Node* oldChild, Node* newChild) {
   std::replace(children_.begin(), children_.end(), oldChild, newChild);
 }
 
-void Node::insertChild(Node* child, uint32_t index) {
-  children_.insert(children_.begin() + index, child);
+void Node::insertChild(Node* child, size_t index) {
+  children_.insert(children_.begin() + static_cast<ptrdiff_t>(index), child);
 }
 
 void Node::setConfig(yoga::Config* config) {
@@ -311,24 +312,30 @@ bool Node::removeChild(Node* child) {
   return false;
 }
 
-void Node::removeChild(uint32_t index) {
-  children_.erase(children_.begin() + index);
+void Node::removeChild(size_t index) {
+  children_.erase(children_.begin() + static_cast<ptrdiff_t>(index));
 }
 
 void Node::setLayoutDirection(YGDirection direction) {
   layout_.setDirection(direction);
 }
 
-void Node::setLayoutMargin(float margin, int index) {
-  layout_.margin[index] = margin;
+void Node::setLayoutMargin(float margin, YGEdge edge) {
+  assertFatal(
+      edge < layout_.margin.size(), "Edge must be top/left/bottom/right");
+  layout_.margin[edge] = margin;
 }
 
-void Node::setLayoutBorder(float border, int index) {
-  layout_.border[index] = border;
+void Node::setLayoutBorder(float border, YGEdge edge) {
+  assertFatal(
+      edge < layout_.border.size(), "Edge must be top/left/bottom/right");
+  layout_.border[edge] = border;
 }
 
-void Node::setLayoutPadding(float padding, int index) {
-  layout_.padding[index] = padding;
+void Node::setLayoutPadding(float padding, YGEdge edge) {
+  assertFatal(
+      edge < layout_.padding.size(), "Edge must be top/left/bottom/right");
+  layout_.padding[edge] = padding;
 }
 
 void Node::setLayoutLastOwnerDirection(YGDirection direction) {
@@ -339,25 +346,30 @@ void Node::setLayoutComputedFlexBasis(const FloatOptional computedFlexBasis) {
   layout_.computedFlexBasis = computedFlexBasis;
 }
 
-void Node::setLayoutPosition(float position, int index) {
-  layout_.position[index] = position;
+void Node::setLayoutPosition(float position, YGEdge edge) {
+  assertFatal(
+      edge < layout_.position.size(), "Edge must be top/left/bottom/right");
+  layout_.position[edge] = position;
 }
 
 void Node::setLayoutComputedFlexBasisGeneration(
     uint32_t computedFlexBasisGeneration) {
   layout_.computedFlexBasisGeneration = computedFlexBasisGeneration;
 }
 
-void Node::setLayoutMeasuredDimension(float measuredDimension, int index) {
-  layout_.measuredDimensions[index] = measuredDimension;
+void Node::setLayoutMeasuredDimension(
+    float measuredDimension,
+    YGDimension dimension) {
+  layout_.measuredDimensions[static_cast<size_t>(dimension)] =
+      measuredDimension;
 }
 
 void Node::setLayoutHadOverflow(bool hadOverflow) {
   layout_.setHadOverflow(hadOverflow);
 }
 
-void Node::setLayoutDimension(float dimension, int index) {
-  layout_.dimensions[index] = dimension;
+void Node::setLayoutDimension(float dimensionValue, YGDimension dimension) {
+  layout_.dimensions[static_cast<size_t>(dimension)] = dimensionValue;
 }
 
 // If both left and right are defined, then use left. Otherwise return +left or