[PATCH 13/26] hw/display/apple-gfx: Defines PGTask_s struct instead of casting

[Phil Dennis-Jordan]

The struct PGTask_s is only forward-declared by the macOS
ParavirtualizedGraphics.framework and treated as opaque, which
means client code can safely provide its own definition.

This change does exactly that, renaming struct AppleGFXTask to
PGTask_s, but keeping the original typedef name. The upshot are
improved type safety and fewer casts.

Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
---
 hw/display/apple-gfx.m | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/hw/display/apple-gfx.m b/hw/display/apple-gfx.m
index a23f731ddc..39e33ed999 100644
--- a/hw/display/apple-gfx.m
+++ b/hw/display/apple-gfx.m
@@ -62,13 +62,13 @@ -(uint32_t)mmioReadAtOffset:(size_t) offset;
 -(void)mmioWriteAtOffset:(size_t) offset value:(uint32_t)value;
 @end
 
-typedef struct AppleGFXTask {
-    QTAILQ_ENTRY(AppleGFXTask) node;
+typedef struct PGTask_s { // Name matches forward declaration in PG header
+    QTAILQ_ENTRY(PGTask_s) node;
     mach_vm_address_t address;
     uint64_t len;
 } AppleGFXTask;
 
-typedef QTAILQ_HEAD(, AppleGFXTask) AppleGFXTaskList;
+typedef QTAILQ_HEAD(, PGTask_s) AppleGFXTaskList;
 
 typedef struct AppleGFXState {
     SysBusDevice parent_obj;
@@ -384,19 +384,19 @@ static void apple_gfx_realize(DeviceState *dev, Error 
**errp)
         AppleGFXTask *task = apple_gfx_new_task(s, vmSize);
         *baseAddress = (void*)task->address;
         trace_apple_gfx_create_task(vmSize, *baseAddress);
-        return (PGTask_t *)task;
+        return task;
     };
 
-    desc.destroyTask = ^(PGTask_t * _Nonnull _task) {
-        AppleGFXTask *task = (AppleGFXTask *)_task;
+    desc.destroyTask = ^(AppleGFXTask * _Nonnull task) {
         trace_apple_gfx_destroy_task(task);
         QTAILQ_REMOVE(&s->tasks, task, node);
         mach_vm_deallocate(mach_task_self(), task->address, task->len);
         g_free(task);
     };
 
-    desc.mapMemory = ^(PGTask_t * _Nonnull _task, uint32_t rangeCount, 
uint64_t virtualOffset, bool readOnly, PGPhysicalMemoryRange_t * _Nonnull 
ranges) {
-        AppleGFXTask *task = (AppleGFXTask*)_task;
+    desc.mapMemory = ^(AppleGFXTask * _Nonnull task, uint32_t rangeCount,
+                       uint64_t virtualOffset, bool readOnly,
+                       PGPhysicalMemoryRange_t * _Nonnull ranges) {
         kern_return_t r;
         mach_vm_address_t target, source;
         trace_apple_gfx_map_memory(task, rangeCount, virtualOffset, readOnly);
@@ -433,8 +433,8 @@ static void apple_gfx_realize(DeviceState *dev, Error 
**errp)
         return (bool)true;
     };
 
-    desc.unmapMemory = ^(PGTask_t * _Nonnull _task, uint64_t virtualOffset, 
uint64_t length) {
-        AppleGFXTask *task = (AppleGFXTask *)_task;
+    desc.unmapMemory = ^(AppleGFXTask * _Nonnull task, uint64_t virtualOffset,
+                         uint64_t length) {
         kern_return_t r;
         mach_vm_address_t range_address;
 
-- 
2.39.3 (Apple Git-146)