Initial community commit

Src/Wasabi/bfc/stack.cpp

@@ -0,0 +1,77 @@
+#include "precomp_wasabi_bfc.h"
+#include "stack.h"
+
+//#define STACK_SIZE_INCREMENT 250
+
+// going from 250 to 32 decreases size of VM working set by several megabytes
+#define STACK_SIZE_INCREMENT 32
+
+StackBase::StackBase() 
+{
+  nslots = 0;
+  cur = 0;
+  stack = NULL;
+}
+
+StackBase::~StackBase()
+{
+  if (stack != NULL) FREE(stack);
+}
+
+int StackBase::push(void *item, int sizeofT, int increment)
+{
+  if (increment <= 0) increment = STACK_SIZE_INCREMENT;
+  if (stack == NULL) {
+    nslots = increment;
+    stack = (char*)MALLOC(sizeofT * nslots);
+  } else if (cur >= nslots) {
+    int newnslots = nslots + increment;
+    stack = (char*)REALLOC(stack, sizeofT*newnslots);
+    nslots = newnslots;
+  }
+  MEMCPY(stack + cur*sizeofT, item, sizeofT);
+  cur++;
+  return cur;
+}
+
+int StackBase::peek() {
+  return cur;
+}
+
+int StackBase::peekAt(void *ptr, int n, int sizeofT) {
+  if (ptr != NULL) MEMCPY(ptr, stack + (cur-1-n)*sizeofT, sizeofT);
+  return cur;
+}
+
+int StackBase::getRef(void **ptr, int n, int sizeofT) {
+  if (ptr != NULL) *ptr = stack + (cur-1-n)*sizeofT;
+  return cur;
+}
+
+void *StackBase::top(int sizeofT) {
+  ASSERT(cur >= 0);
+  if (cur == 0) return NULL;
+  return stack + (cur-1)*sizeofT;
+}
+
+int StackBase::pop(void *ptr, int sizeofT) {
+  ASSERT(cur >= 0);
+  if (cur == 0) return 0;
+  ASSERT(stack != NULL);
+  --cur;
+  if (ptr != NULL) MEMCPY(ptr, stack + cur*sizeofT, sizeofT);
+  return 1;
+}
+
+int StackBase::isempty() {
+  return cur == 0;
+}
+
+void StackBase::purge() {
+  ASSERT(isempty());
+  if (stack != NULL) {
+    FREE(stack);
+    stack = NULL;
+  }
+}
+