Remove oldSize from allocate API.

binary_trees - wren            .......... 0.29s 0.0048 107.79% relative to baseline
delta_blue - wren              .......... 0.12s 0.0017 106.95% relative to baseline
fib - wren                     .......... 0.30s 0.0042 119.95% relative to baseline
for - wren                     .......... 0.12s 0.0020 107.57% relative to baseline
method_call - wren             .......... 0.15s 0.0256 106.09% relative to baseline
map_numeric - wren             .......... 0.44s 0.0199 105.27% relative to baseline
map_string - wren              .......... 0.14s 0.0049 100.18% relative to baseline
string_equals - wren           .......... 0.30s 0.0032 100.57% relative to baseline

Thanks, Michel!

script/benchmark.py

@@ -264,7 +264,7 @@ def read_baseline():
             benchmark[2] = float(best)
 
 
-def generate_baseline(graph):
+def generate_baseline():
   print("generating baseline")
   baseline_text = ""
   for benchmark in BENCHMARKS:

src/include/wren.h

@@ -14,20 +14,19 @@ typedef struct WrenMethod WrenMethod;
 // A generic allocation function that handles all explicit memory management
 // used by Wren. It's used like so:
 //
-// - To allocate new memory, [memory] is NULL and [oldSize] is zero. It should
-//   return the allocated memory or NULL on failure.
+// - To allocate new memory, [memory] is NULL and [newSize] is the desired
+//   size. It should return the allocated memory or NULL on failure.
 //
-// - To attempt to grow an existing allocation, [memory] is the memory,
-//   [oldSize] is its previous size, and [newSize] is the desired size.
-//   It should return [memory] if it was able to grow it in place, or a new
-//   pointer if it had to move it.
+// - To attempt to grow an existing allocation, [memory] is the memory, and
+//   [newSize] is the desired size. It should return [memory] if it was able to
+//   grow it in place, or a new pointer if it had to move it.
 //
-// - To shrink memory, [memory], [oldSize], and [newSize] are the same as above
-//   but it will always return [memory].
+// - To shrink memory, [memory] and [newSize] are the same as above but it will
+//   always return [memory].
 //
-// - To free memory, [memory] will be the memory to free and [newSize] and
-//   [oldSize] will be zero. It should return NULL.
-typedef void* (*WrenReallocateFn)(void* memory, size_t oldSize, size_t newSize);
+// - To free memory, [memory] will be the memory to free and [newSize] will be
+//   zero. It should return NULL.
+typedef void* (*WrenReallocateFn)(void* memory, size_t newSize);
 
 // A function callable from Wren code, but implemented in C.
 typedef void (*WrenForeignMethodFn)(WrenVM* vm);

src/vm/wren_vm.c

@@ -18,22 +18,15 @@
   #include <time.h>
 #endif
 
-// The built-in reallocation function used when one is not provided by the
-// configuration.
-static void* defaultReallocate(void* memory, size_t oldSize, size_t newSize)
-{
-  return realloc(memory, newSize);
-}
-
 WrenVM* wrenNewVM(WrenConfiguration* configuration)
 {
-  WrenReallocateFn reallocate = defaultReallocate;
+  WrenReallocateFn reallocate = realloc;
   if (configuration->reallocateFn != NULL)
   {
     reallocate = configuration->reallocateFn;
   }
 
-  WrenVM* vm = (WrenVM*)reallocate(NULL, 0, sizeof(*vm));
+  WrenVM* vm = (WrenVM*)reallocate(NULL, sizeof(*vm));
   memset(vm, 0, sizeof(WrenVM));
 
   vm->reallocate = reallocate;
@@ -209,7 +202,7 @@ void* wrenReallocate(WrenVM* vm, void* memory, size_t oldSize, size_t newSize)
   if (newSize > 0 && vm->bytesAllocated > vm->nextGC) collectGarbage(vm);
 #endif
 
-  return vm->reallocate(memory, oldSize, newSize);
+  return vm->reallocate(memory, newSize);
 }
 
 // Captures the local variable [local] into an [Upvalue]. If that local is