simple realloc implementation

2 files changed, 16 insertions, 6 deletions

diff --git a/src/library.js b/src/library.js
index 6567ebab..b7c9c157 100644
--- a/src/library.js
+++ b/src/library.js
@@ -39,6 +39,21 @@ var Library = {
     throw 'ABORT: ' + code + ', at ' + (new Error().stack);
   },
 
+  realloc: function(ptr, size) {
+    // Very simple, inefficient implementation - if you use a real malloc, best to use
+    // a real realloc with it
+    if (!size) {
+      if (ptr) _free(ptr);
+      return 0;
+    }
+    var ret = _malloc(size);
+    if (ptr) {
+      _memcpy(ret, ptr, size); // might be some invalid reads
+      _free(ptr);
+    }
+    return ret;
+  },
+
   // string.h
 
   strspn: function(pstr, pset) {
diff --git a/src/preamble.js b/src/preamble.js
index 133e2669..47278f83 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -301,7 +301,6 @@ function _atoi(s) {
 }
 
 function _llvm_memcpy_i32(dest, src, num, idunno) {
-// XXX hardcoded ptr impl
   for (var i = 0; i < num; i++) {
 #if SAFE_HEAP
     SAFE_HEAP_STORE(dest + i, HEAP[src + i]);
@@ -314,12 +313,8 @@ function _llvm_memcpy_i32(dest, src, num, idunno) {
 #endif
 #endif
   }
-//  dest = Pointer_niceify(dest);
-//  src = Pointer_niceify(src);
-//  dest.slab = src.slab.slice(src.pos);
 }
-_llvm_memcpy_i64 = _llvm_memcpy_i32;
-_llvm_memcpy_p0i8_p0i8_i32 = _llvm_memcpy_i32;
+_memcpy = _llvm_memcpy_i64 = _llvm_memcpy_p0i8_p0i8_i32 = _llvm_memcpy_i32;
 
 function llvm_memset_i32(ptr, value, num) {
   for (var i = 0; i < num; i++) {