import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

tools/jprof/intcnt.cpp

@@ -0,0 +1,71 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "intcnt.h"
+
+IntCount::IntCount() : numInts(0), iPair(nullptr) { }
+IntCount::~IntCount() { delete [] iPair;}
+int IntCount::getSize() {return numInts;}
+int IntCount::getCount(int pos) {return iPair[pos].cnt;}
+int IntCount::getIndex(int pos) {return iPair[pos].idx;}
+
+void IntCount::clear()
+{
+    delete[] iPair;
+    iPair = new IntPair[0];
+    numInts = 0;
+}
+
+int IntCount::countAdd(int index, int increment)
+{
+  if(numInts) {
+    // Do a binary search to find the element
+    int divPoint = 0;
+
+    if(index>iPair[numInts-1].idx) {
+	    divPoint = numInts;
+    } else if(index<iPair[0].idx) {
+	    divPoint = 0;
+    } else {
+	    int low=0, high=numInts-1;
+	    int mid = (low+high)/2;
+	    while(1) {
+        mid = (low+high)/2;
+
+        if(index<iPair[mid].idx) {
+          high = mid;
+        } else if(index>iPair[mid].idx) {
+          if(mid<numInts-1 && index<iPair[mid+1].idx) {
+            divPoint = mid+1;
+            break;
+          } else {
+            low = mid+1;
+          }
+        } else if(index==iPair[mid].idx) {
+          return iPair[mid].cnt += increment;
+        }
+	    }
+    }
+
+    int i;
+    IntPair *tpair = new IntPair[numInts+1];
+    for(i=0; i<divPoint; i++) {
+      tpair[i] = iPair[i];
+    }
+    for(i=divPoint; i<numInts; i++) {
+      tpair[i+1] = iPair[i];
+    }
+    ++numInts;
+    delete [] iPair;
+    iPair = tpair;
+    iPair[divPoint].idx = index;
+    iPair[divPoint].cnt = increment;
+    return increment;
+  } else {
+    iPair = new IntPair[1];
+    numInts = 1;
+    iPair[0].idx = index;
+    return iPair[0].cnt = increment;
+  }
+}