Index: Modules/_json.c
===================================================================
--- Modules/_json.c	(révision 76635)
+++ Modules/_json.c	(copie de travail)
@@ -442,9 +442,22 @@
     Py_ssize_t next = begin;
     int has_unicode = 0;
     char *buf = PyString_AS_STRING(pystr);
-    PyObject *chunks = PyList_New(0);
-    if (chunks == NULL) {
-        goto bail;
+    PyObject *chunks = NULL;
+    PyObject *chunk = NULL;
+
+#define APPEND_OLD_CHUNK \
+    if (chunk != NULL) { \
+        if (chunks == NULL) { \
+            chunks = PyList_New(0); \
+            if (chunks == NULL) { \
+                goto bail; \
+            } \
+        } \
+        if (PyList_Append(chunks, chunk)) { \
+            Py_DECREF(chunk); \
+            goto bail; \
+        } \
+        Py_CLEAR(chunk); \
     }
     if (end < 0 || len <= end) {
         PyErr_SetString(PyExc_ValueError, "end is out of bounds");
@@ -453,7 +466,6 @@
     while (1) {
         /* Find the end of the string or the next escape */
         Py_UNICODE c = 0;
-        PyObject *chunk = NULL;
         for (next = end; next < len; next++) {
             c = (unsigned char)buf[next];
             if (c == '"' || c == '\\') {
@@ -473,6 +485,7 @@
         }
         /* Pick up this chunk if it's not zero length */
         if (next != end) {
+            APPEND_OLD_CHUNK
             PyObject *strchunk = PyString_FromStringAndSize(&buf[end], next - end);
             if (strchunk == NULL) {
                 goto bail;
@@ -487,11 +500,6 @@
             else {
                 chunk = strchunk;
             }
-            if (PyList_Append(chunks, chunk)) {
-                Py_DECREF(chunk);
-                goto bail;
-            }
-            Py_DECREF(chunk);
         }
         next++;
         if (c == '"') {
@@ -596,6 +604,7 @@
         if (c > 0x7f) {
             has_unicode = 1;
         }
+        APPEND_OLD_CHUNK
         if (has_unicode) {
             chunk = PyUnicode_FromUnicode(&c, 1);
             if (chunk == NULL) {
@@ -609,18 +618,22 @@
                 goto bail;
             }
         }
-        if (PyList_Append(chunks, chunk)) {
-            Py_DECREF(chunk);
+    }
+
+    if (chunks == NULL) {
+        if (chunk != NULL)
+            rval = chunk;
+        else
+            rval = PyString_FromStringAndSize("", 0);
+    }
+    else {
+        APPEND_OLD_CHUNK
+        rval = join_list_string(chunks);
+        if (rval == NULL) {
             goto bail;
         }
-        Py_DECREF(chunk);
+        Py_CLEAR(chunks);
     }
-
-    rval = join_list_string(chunks);
-    if (rval == NULL) {
-        goto bail;
-    }
-    Py_CLEAR(chunks);
     *next_end_ptr = end;
     return rval;
 bail:
@@ -927,18 +940,26 @@
     */
     char *str = PyString_AS_STRING(pystr);
     Py_ssize_t end_idx = PyString_GET_SIZE(pystr) - 1;
-    PyObject *rval;
-    PyObject *pairs;
+    PyObject *rval = NULL;
+    PyObject *pairs = NULL;
     PyObject *item;
     PyObject *key = NULL;
     PyObject *val = NULL;
     char *encoding = PyString_AS_STRING(s->encoding);
     int strict = PyObject_IsTrue(s->strict);
+    int has_pairs_hook = (s->pairs_hook != Py_None);
     Py_ssize_t next_idx;
 
-    pairs = PyList_New(0);
-    if (pairs == NULL)
-        return NULL;
+    if (has_pairs_hook) {
+        pairs = PyList_New(0);
+        if (pairs == NULL)
+            return NULL;
+    }
+    else {
+        rval = PyDict_New();
+        if (rval == NULL)
+            return NULL;
+    }
 
     /* skip whitespace after { */
     while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
@@ -970,16 +991,24 @@
             if (val == NULL)
                 goto bail;
 
-            item = PyTuple_Pack(2, key, val);
-            if (item == NULL)
-                goto bail;
-            Py_CLEAR(key);
-            Py_CLEAR(val);
-            if (PyList_Append(pairs, item) == -1) {
+            if (has_pairs_hook) {
+                item = PyTuple_Pack(2, key, val);
+                if (item == NULL)
+                    goto bail;
+                Py_CLEAR(key);
+                Py_CLEAR(val);
+                if (PyList_Append(pairs, item) == -1) {
+                    Py_DECREF(item);
+                    goto bail;
+                }
                 Py_DECREF(item);
-                goto bail;
             }
-            Py_DECREF(item);
+            else {
+                if (PyDict_SetItem(rval, key, val) < 0)
+                    goto bail;
+                Py_CLEAR(key);
+                Py_CLEAR(val);
+            }
             idx = next_idx;
 
             /* skip whitespace before } or , */
@@ -1016,12 +1045,6 @@
         return val;
     }
 
-    rval = PyObject_CallFunctionObjArgs((PyObject *)(&PyDict_Type), 
-                                         pairs, NULL);
-    if (rval == NULL)
-        goto bail;
-    Py_CLEAR(pairs);
-
     /* if object_hook is not None: rval = object_hook(rval) */
     if (s->object_hook != Py_None) {
         val = PyObject_CallFunctionObjArgs(s->object_hook, rval, NULL);
@@ -1034,6 +1057,7 @@
     *next_idx_ptr = idx + 1;
     return rval;
 bail:
+    Py_XDECREF(rval);
     Py_XDECREF(key);
     Py_XDECREF(val);
     Py_XDECREF(pairs);