tailored allocation, and increased MAX_EDGE to 14

archimedean.cpp

@@ -410,7 +410,8 @@ struct hrmap_archimedean : hrmap {
   heptagon *getOrigin() { return origin; }
 
   hrmap_archimedean() {
-    origin = new heptagon;
+    int N0 = isize(current.adjacent[0]);
+    origin = tailored_alloc<heptagon> (N0);
     origin->s = hsOrigin;
     origin->emeraldval = 0;
     origin->zebraval = 0;
@@ -418,23 +419,21 @@ struct hrmap_archimedean : hrmap {
     origin->fieldval = 0;
     origin->rval0 = origin->rval1 = 0;
     origin->cdata = NULL;
-    origin->c.clear();
     origin->alt = NULL;
     origin->distance = 0;
 
     parent_index_of(origin) = 0;
     id_of(origin) = 0;
-    origin->c7 = newCell(isize(current.adjacent[0]), origin);
+    origin->c7 = newCell(N0, origin);
     
     heptagon *alt = NULL;
     
     if(hyperbolic) {
       dynamicval<eGeometry> g(geometry, gNormal); 
-      alt = new heptagon;
+      alt = tailored_alloc<heptagon> (S7);
       alt->s = hsOrigin;
       alt->emeraldval = 0;
       alt->zebraval = 0;
-      alt->c.clear();
       alt->distance = 0;
       alt->c7 = NULL;
       alt->alt = alt;
@@ -491,7 +490,7 @@ transmatrix adjcell_matrix(heptagon *h, int d);
 
 heptagon *build_child(heptspin p, pair<int, int> adj) {
   indenter ind;
-  auto h = buildHeptagon1(new heptagon, p.at, p.spin, hstate(1), 0);
+  auto h = buildHeptagon1(tailored_alloc<heptagon> (isize(current.adjacent[adj.first])), p.at, p.spin, hstate(1), 0);
   SDEBUG( printf("NEW %p.%d ~ %p.0\n", p.at, p.spin, h); )
   id_of(h) = adj.first;
   parent_index_of(h) = adj.second;

barriers.cpp

@@ -741,7 +741,7 @@ bool buildBarrierNowall(cell *c, eLand l2, int forced_dir) {
   bool warpv = warped_version(c->land, l2);
   if(warpv && !archimedean && !pseudohept(c)) return false;
   
-  int ds[8];
+  int ds[MAX_EDGE];
   for(int i=0; i<c->type; i++) ds[i] = i;
   for(int j=0; j<c->type; j++) swap(ds[j], ds[hrand(j+1)]);
 

bigstuff.cpp

@@ -202,13 +202,12 @@ heptagon *createAlternateMap(cell *c, int rad, hstate firststate, int special) {
     if(polarb50(c) != 1) return NULL;
     }
   
-  heptagon *alt = new heptagon;
+  heptagon *alt = tailored_alloc<heptagon> (S7);
   allmaps.push_back(newAltMap(alt));
 //printf("new alt {%p}\n", alt);
   alt->s = firststate;
   alt->emeraldval = 0;
   alt->zebraval = 0;
-  alt->c.clear();
   alt->distance = 0;
   alt->c7 = NULL;
   alt->alt = alt;

binary-tiling.cpp

@@ -77,7 +77,7 @@ namespace binary {
     }
   
   heptagon *build(heptagon *parent, int d, int d1, int t, int side, int delta) {
-    auto h = buildHeptagon1(new heptagon, parent, d, hsOrigin, d1);
+    auto h = buildHeptagon1(tailored_alloc<heptagon> (t), parent, d, hsOrigin, d1);
     h->distance = parent->distance + delta;
     h->c7 = newCell(t, h);
     h->cdata = NULL;

cell.cpp

@@ -22,10 +22,9 @@ int cellcount = 0;
 void initcell(cell *c); // from game.cpp
 
 cell *newCell(int type, heptagon *master) {
-  cell *c = new cell;
+  cell *c = tailored_alloc<cell> (type);
   c->type = type;
   c->master = master;
-  for(int i=0; i<MAX_EDGE; i++) c->move(i) = NULL;
   initcell(c);
   return c;
   }
@@ -52,7 +51,7 @@ hrmap *newAltMap(heptagon *o) { return new hrmap_alternate(o); }
 
 hrmap_hyperbolic::hrmap_hyperbolic() {
   // printf("Creating hyperbolic map: %p\n", this);
-  origin = new heptagon;
+  origin = tailored_alloc<heptagon> (S7);
   heptagon& h = *origin;
   h.s = hsOrigin;
   h.emeraldval = a46 ? 0 : 98;
@@ -61,7 +60,6 @@ hrmap_hyperbolic::hrmap_hyperbolic() {
   h.fieldval = 0;
   h.rval0 = h.rval1 = 0;
   h.cdata = NULL;
-  h.c.clear();
   h.alt = NULL;
   h.distance = 0;
   isnonbitrunc = nonbitrunc;
@@ -109,7 +107,7 @@ struct hrmap_spherical : hrmap {
       h.rval0 = h.rval1 = 0;
       h.alt = NULL;
       h.cdata = NULL;
-      h.c.clear();
+      h.c.fullclear();
       h.fieldval = i;
       if(!irr::on) h.c7 = newCell(S7, &h);
       }

heptagon.cpp

@@ -69,14 +69,13 @@ template<class... T> auto iprintf(T... t) { for(int i=0; i<indent; i++) putchar(
 heptagon *buildHeptagon1(heptagon *h, heptagon *parent, int d, hstate s, int pard = 0, int fixdistance = COMPUTE) {
   h->alt = NULL;
   h->s = s;
-  h->c.clear();
   h->c.connect(pard, parent, d, false);
   h->cdata = NULL;
   return h;
   }
   
 heptagon *buildHeptagon(heptagon *parent, int d, hstate s, int pard = 0, int fixdistance = COMPUTE) {
-  heptagon *h = buildHeptagon1(new heptagon, parent, d, s, pard, fixdistance);
+  heptagon *h = buildHeptagon1(tailored_alloc<heptagon> (S7), parent, d, s, pard, fixdistance);
   if(binarytiling || archimedean) return h;
   if(parent->c7) {
     if(irr::on)

hyper.h

@@ -320,30 +320,43 @@ struct gcell {
 #define NOBARRIERS 15
 #define MODFIXER 10090080
 
-#define MAX_EDGE 12
+#define MAX_EDGE 14
 
 template<class T> struct walker;
 
 template<class T> struct connection_table {
+
+  // Assumption: class T has a field c of type connection_table<T>.
+
+  // NOTE: since aconnection_table may be allocated with
+  // less than MAX_EDGE neighbors (see tailored_alloc),
+  // the order of fields matters.
+
   unsigned char spintable[6];
   unsigned short mirrortable;
-  // neighbors; move[0] always goes towards origin, and then we go clockwise
   T* move_table[MAX_EDGE];
+  unsigned char spintable_extra[2];
+  
   T* full() { T* x; return (T*)((char*)this - ((char*)(&(x->c)) - (char*)x)); }
+  unsigned char& get_spinchar(int d) {
+    if(d < 12) return spintable[d>>1];
+    else return spintable_extra[(d-12)>>1];
+    }
   void setspin(int d, int spin, bool mirror) { 
-    spintable[d>>1] &= ~(15 << ((d&1) << 2));
-    spintable[d>>1] |= spin << ((d&1) << 2);
+    unsigned char& c = get_spinchar(d);
+    c &= ~(15 << ((d&1) << 2));
+    c |= spin << ((d&1) << 2);
     if(mirror) mirrortable |= (1 << d);
     else mirrortable &=~ (1 << d);
     }
   // we are spin(i)-th neighbor of move[i]
-  int spin(int d) { return (spintable[d>>1] >> ((d&1)<<2)) & 15; }
+  int spin(int d) { return (get_spinchar(d) >> ((d&1)<<2)) & 15; }
   bool mirror(int d) { return (mirrortable >> d) & 1; }  
   int fix(int d) { return (d + MODFIXER) % full()->degree(); }
   T*& modmove(int i) { return move(fix(i)); }
   T*& move(int i) { return move_table[i]; }
   unsigned char modspin(int i) { return spin(fix(i)); }
-  void clear() { 
+  void fullclear() { 
     for(int i=0; i<MAX_EDGE; i++) move_table[i] = NULL;
     }
   void connect(int d0, T* c1, int d1, bool m) {
@@ -357,6 +370,29 @@ template<class T> struct connection_table {
     }
   };
 
+// Allocate a class T with a connection_table, but 
+// with only `degree` connections. Also set yet
+// unknown connections to NULL.
+
+// Generating the hyperbolic world consumes lots of
+// RAM, so we really need to be careful on low memory devices. 
+
+template<class T> T* tailored_alloc(int degree) {
+  const T* sample = (T*) &degree;
+  T* result;
+#ifndef NO_TAILORED_ALLOC
+  if(degree <= 12) {
+    int b = (char*)&sample->c.move_table[degree] - (char*) sample;
+    result = (T*) new char[b];
+    new (result) T();
+    }
+  else 
+#endif
+    result = new T;
+  for(int i=0; i<degree; i++) result->c.move_table[i] = NULL;
+  return result;
+  }
+
 static const struct wstep_t { wstep_t() {} } wstep;
 static const struct wmirror_t { wmirror_t() {}} wmirror;
 static const struct rev_t { rev_t() {} } rev;
@@ -415,8 +451,6 @@ template<class T> struct walker {
   walker<T> mirrorat(int d) { return walker<T> (at, at->c.fix(d+d - spin), !mirrored); }
   };
 
-inline int fix42(int a) { return (a+MODFIXER)% S42; }
-
 struct cell;
 
 // automaton state
@@ -455,6 +489,11 @@ struct heptagon {
   ~heptagon () { heptacount--; }
   heptagon *cmove(int d) { return createStep(this, d); }
   inline int degree(); 
+
+  // prevent accidental copying
+  heptagon(const heptagon&) = delete;
+  heptagon& operator=(const heptagon&) = delete;
+  // do not add any fields after connection_table (see tailored_alloc)
   };
 
 struct cell : gcell {
@@ -472,6 +511,12 @@ struct cell : gcell {
   cell*& move(int d) { return c.move(d); }
   cell*& modmove(int d) { return c.modmove(d); }
   cell* cmove(int d) { return createMov(this, d); }
+  cell() {}
+
+  // prevent accidental copying
+  cell(const cell&) = delete;
+  heptagon& operator=(const cell&) = delete;
+  // do not add any fields after connection_table (see tailored_alloc)
   };
 
 int heptagon::degree() { if(archimedean) return c7->type; else return S7; }