NFC: Rename ConceptPAL to IsPAL

src/snmalloc/backend/backend.h

@@ -9,7 +9,7 @@ namespace snmalloc
    * address space management (LocalState).
    */
   template<
-    SNMALLOC_CONCEPT(ConceptPAL) PAL,
+    SNMALLOC_CONCEPT(IsPAL) PAL,
     typename PagemapEntry,
     typename Pagemap,
     typename LocalState>

src/snmalloc/backend/fixedglobalconfig.h

@@ -8,7 +8,7 @@ namespace snmalloc
   /**
    * A single fixed address range allocator configuration
    */
-  template<SNMALLOC_CONCEPT(ConceptPAL) PAL>
+  template<SNMALLOC_CONCEPT(IsPAL) PAL>
   class FixedRangeConfig final : public CommonConfig
   {
   public:

src/snmalloc/backend_helpers/cheri_slabmetadata_mixin.h

@@ -18,11 +18,7 @@ namespace snmalloc
   template<typename SlabMetadata>
   class StrictProvenanceSlabMetadataMixin : public SlabMetadata
   {
-    template<
-      SNMALLOC_CONCEPT(ConceptPAL) A1,
-      typename A2,
-      typename A3,
-      typename A4>
+    template<SNMALLOC_CONCEPT(IsPAL) A1, typename A2, typename A3, typename A4>
     friend class BackendAllocator;
 
     capptr::Arena<void> arena;

src/snmalloc/backend_helpers/defaultpagemapentry.h

@@ -24,11 +24,7 @@ namespace snmalloc
     /**
      * The private initialising constructor is usable only by this back end.
      */
-    template<
-      SNMALLOC_CONCEPT(ConceptPAL) A1,
-      typename A2,
-      typename A3,
-      typename A4>
+    template<SNMALLOC_CONCEPT(IsPAL) A1, typename A2, typename A3, typename A4>
     friend class BackendAllocator;
 
     /**

src/snmalloc/backend_helpers/palrange.h

@@ -3,7 +3,7 @@
 
 namespace snmalloc
 {
-  template<SNMALLOC_CONCEPT(ConceptPAL) PAL>
+  template<SNMALLOC_CONCEPT(IsPAL) PAL>
   class PalRange
   {
   public:

src/snmalloc/mem/backend_concept.h

@@ -162,7 +162,7 @@ namespace snmalloc
    */
   template<typename Config>
   concept IsConfig = std::is_base_of<CommonConfig, Config>::value&&
-    ConceptPAL<typename Config::Pal>&& IsBackend<
+    IsPAL<typename Config::Pal>&& IsBackend<
       typename Config::LocalState,
       typename Config::PagemapEntry,
       typename Config::Backend>&& requires()

src/snmalloc/pal/pal_concept.h

@@ -19,7 +19,7 @@ namespace snmalloc
    * PALs must advertize the bit vector of their supported features.
    */
   template<typename PAL>
-  concept ConceptPAL_static_features = requires()
+  concept IsPAL_static_features = requires()
   {
     typename std::integral_constant<uint64_t, PAL::pal_features>;
   };
@@ -28,7 +28,7 @@ namespace snmalloc
    * PALs must advertise the size of the address space and their page size
    */
   template<typename PAL>
-  concept ConceptPAL_static_sizes = requires()
+  concept IsPAL_static_sizes = requires()
   {
     typename std::integral_constant<std::size_t, PAL::address_bits>;
     typename std::integral_constant<std::size_t, PAL::page_size>;
@@ -38,7 +38,7 @@ namespace snmalloc
    * PALs expose an error reporting function which takes a const C string.
    */
   template<typename PAL>
-  concept ConceptPAL_error = requires(const char* const str)
+  concept IsPAL_error = requires(const char* const str)
   {
     {
       PAL::error(str)
@@ -50,7 +50,7 @@ namespace snmalloc
    * PALs expose a basic library of memory operations.
    */
   template<typename PAL>
-  concept ConceptPAL_memops = requires(void* vp, std::size_t sz)
+  concept IsPAL_memops = requires(void* vp, std::size_t sz)
   {
     {
       PAL::notify_not_using(vp, sz)
@@ -82,7 +82,7 @@ namespace snmalloc
    * places.
    */
   template<typename PAL>
-  concept ConceptPAL_tid = requires()
+  concept IsPAL_tid = requires()
   {
     {
       PAL::get_tid()
@@ -94,7 +94,7 @@ namespace snmalloc
    * Absent any feature flags, the PAL must support a crude primitive allocator
    */
   template<typename PAL>
-  concept ConceptPAL_reserve = requires(PAL p, std::size_t sz)
+  concept IsPAL_reserve = requires(PAL p, std::size_t sz)
   {
     {
       PAL::reserve(sz)
@@ -106,7 +106,7 @@ namespace snmalloc
    * Some PALs expose a richer allocator which understands aligned allocations
    */
   template<typename PAL>
-  concept ConceptPAL_reserve_aligned = requires(std::size_t sz)
+  concept IsPAL_reserve_aligned = requires(std::size_t sz)
   {
     {
       PAL::template reserve_aligned<true>(sz)
@@ -122,7 +122,7 @@ namespace snmalloc
    * Some PALs can provide memory pressure callbacks.
    */
   template<typename PAL>
-  concept ConceptPAL_mem_low_notify = requires(PalNotificationObject* pno)
+  concept IsPAL_mem_low_notify = requires(PalNotificationObject* pno)
   {
     {
       PAL::expensive_low_memory_check()
@@ -135,7 +135,7 @@ namespace snmalloc
   };
 
   template<typename PAL>
-  concept ConceptPAL_get_entropy64 = requires()
+  concept IsPAL_get_entropy64 = requires()
   {
     {
       PAL::get_entropy64()
@@ -149,18 +149,20 @@ namespace snmalloc
    * requisite claimed pal_features.  PALs not claiming particular features
    * are, naturally, not bound by the corresponding concept.
    */
+  // clang-format off
   template<typename PAL>
-  concept ConceptPAL = ConceptPAL_static_features<PAL>&&
-                         ConceptPAL_static_sizes<PAL>&& ConceptPAL_error<PAL>&&
-                           ConceptPAL_memops<PAL>&& ConceptPAL_tid<PAL> &&
-    (!pal_supports<Entropy, PAL> ||
-     ConceptPAL_get_entropy64<
-       PAL>)&&(!pal_supports<LowMemoryNotification, PAL> ||
-               ConceptPAL_mem_low_notify<
-                 PAL>)&&(pal_supports<NoAllocation, PAL> ||
-                         ((!pal_supports<AlignedAllocation, PAL> ||
-                           ConceptPAL_reserve_aligned<
-                             PAL>)&&ConceptPAL_reserve<PAL>));
+  concept IsPAL =
+    IsPAL_static_features<PAL> &&
+    IsPAL_static_sizes<PAL> &&
+    IsPAL_error<PAL> &&
+    IsPAL_memops<PAL> &&
+    IsPAL_tid<PAL> &&
+    (!pal_supports<Entropy, PAL> || IsPAL_get_entropy64<PAL>) &&
+    (!pal_supports<LowMemoryNotification, PAL> || IsPAL_mem_low_notify<PAL>) &&
+    (pal_supports<NoAllocation, PAL> ||
+      ((!pal_supports<AlignedAllocation, PAL> || IsPAL_reserve_aligned<PAL>) &&
+        IsPAL_reserve<PAL>));
+  // clang-format on
 
 } // namespace snmalloc
 #endif

src/snmalloc/pal/pal_noalloc.h

@@ -17,7 +17,7 @@ namespace snmalloc
    * The minimal subset of a PAL that we need for delegation
    */
   template<typename PAL>
-  concept PALNoAllocBase = ConceptPAL_static_sizes<PAL>&& ConceptPAL_error<PAL>;
+  concept PALNoAllocBase = IsPAL_static_sizes<PAL>&& IsPAL_error<PAL>;
 #endif
 
   /**