# HG changeset patch
# User dsimms
# Date 1377502381 -7200
# Node ID 409c50cf1e5de3347da794f49c25058f695b6ace
# Parent  8f3ad1962aefc84e2d9c9957fdf4068c369e5db6
8022683: JNI GetStringUTFChars should return NULL on allocation failure not abort the VM
Summary: Return NULL on OOM from GetStringChars, GetStringUTFChars and Get<PrimitiveType>ArrayElements family of functions.
Reviewed-by: dholmes, coleenp

diff -r 8f3ad1962aef -r 409c50cf1e5d hotspot/src/share/vm/memory/allocation.hpp
--- a/hotspot/src/share/vm/memory/allocation.hpp	Sun Aug 25 21:21:18 2013 -0400
+++ b/hotspot/src/share/vm/memory/allocation.hpp	Mon Aug 26 09:33:01 2013 +0200
@@ -666,7 +666,7 @@
   NEW_RESOURCE_ARRAY_RETURN_NULL(type, 1)
 
 #define NEW_C_HEAP_ARRAY3(type, size, memflags, pc, allocfail)\
-  (type*) AllocateHeap(size * sizeof(type), memflags, pc, allocfail)
+  (type*) AllocateHeap((size) * sizeof(type), memflags, pc, allocfail)
 
 #define NEW_C_HEAP_ARRAY2(type, size, memflags, pc)\
   (type*) (AllocateHeap((size) * sizeof(type), memflags, pc))
@@ -675,16 +675,16 @@
   (type*) (AllocateHeap((size) * sizeof(type), memflags))
 
 #define NEW_C_HEAP_ARRAY2_RETURN_NULL(type, size, memflags, pc)\
-  NEW_C_HEAP_ARRAY3(type, size, memflags, pc, AllocFailStrategy::RETURN_NULL)
+  NEW_C_HEAP_ARRAY3(type, (size), memflags, pc, AllocFailStrategy::RETURN_NULL)
 
 #define NEW_C_HEAP_ARRAY_RETURN_NULL(type, size, memflags)\
-  NEW_C_HEAP_ARRAY3(type, size, memflags, (address)0, AllocFailStrategy::RETURN_NULL)
+  NEW_C_HEAP_ARRAY3(type, (size), memflags, (address)0, AllocFailStrategy::RETURN_NULL)
 
 #define REALLOC_C_HEAP_ARRAY(type, old, size, memflags)\
-  (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), memflags))
+  (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags))
 
 #define REALLOC_C_HEAP_ARRAY_RETURN_NULL(type, old, size, memflags)\
-   (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), memflags, AllocFailStrategy::RETURN_NULL))
+  (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags, AllocFailStrategy::RETURN_NULL))
 
 #define FREE_C_HEAP_ARRAY(type, old, memflags) \
   FreeHeap((char*)(old), memflags)
diff -r 8f3ad1962aef -r 409c50cf1e5d hotspot/src/share/vm/prims/jni.cpp
--- a/hotspot/src/share/vm/prims/jni.cpp	Sun Aug 25 21:21:18 2013 -0400
+++ b/hotspot/src/share/vm/prims/jni.cpp	Mon Aug 26 09:33:01 2013 +0200
@@ -3234,19 +3234,22 @@
  HOTSPOT_JNI_GETSTRINGCHARS_ENTRY(
                                   env, string, (uintptr_t *) isCopy);
 #endif /* USDT2 */
-  //%note jni_5
-  if (isCopy != NULL) {
-    *isCopy = JNI_TRUE;
-  }
   oop s = JNIHandles::resolve_non_null(string);
   int s_len = java_lang_String::length(s);
   typeArrayOop s_value = java_lang_String::value(s);
   int s_offset = java_lang_String::offset(s);
-  jchar* buf = NEW_C_HEAP_ARRAY(jchar, s_len + 1, mtInternal);  // add one for zero termination
-  if (s_len > 0) {
-    memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len);
+  jchar* buf = NEW_C_HEAP_ARRAY_RETURN_NULL(jchar, s_len + 1, mtInternal);  // add one for zero termination
+  /* JNI Specification states return NULL on OOM */
+  if (buf != NULL) {
+    if (s_len > 0) {
+      memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len);
+    }
+    buf[s_len] = 0;
+    //%note jni_5
+    if (isCopy != NULL) {
+      *isCopy = JNI_TRUE;
+    }
   }
-  buf[s_len] = 0;
 #ifndef USDT2
   DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf);
 #else /* USDT2 */
@@ -3335,9 +3338,14 @@
 #endif /* USDT2 */
   oop java_string = JNIHandles::resolve_non_null(string);
   size_t length = java_lang_String::utf8_length(java_string);
-  char* result = AllocateHeap(length + 1, mtInternal);
-  java_lang_String::as_utf8_string(java_string, result, (int) length + 1);
-  if (isCopy != NULL) *isCopy = JNI_TRUE;
+  /* JNI Specification states return NULL on OOM */
+  char* result = AllocateHeap(length + 1, mtInternal, 0, AllocFailStrategy::RETURN_NULL);
+  if (result != NULL) {
+    java_lang_String::as_utf8_string(java_string, result, (int) length + 1);
+    if (isCopy != NULL) {
+      *isCopy = JNI_TRUE;
+    }
+  }
 #ifndef USDT2
   DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result);
 #else /* USDT2 */
@@ -3591,11 +3599,16 @@
      * Avoid asserts in typeArrayOop. */ \
     result = (ElementType*)get_bad_address(); \
   } else { \
-    result = NEW_C_HEAP_ARRAY(ElementType, len, mtInternal); \
-    /* copy the array to the c chunk */ \
-    memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \
+    /* JNI Specification states return NULL on OOM */                    \
+    result = NEW_C_HEAP_ARRAY_RETURN_NULL(ElementType, len, mtInternal); \
+    if (result != NULL) {                                                \
+      /* copy the array to the c chunk */                                \
+      memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len);      \
+      if (isCopy) {                                                      \
+        *isCopy = JNI_TRUE;                                              \
+      }                                                                  \
+    }                                                                    \
   } \
-  if (isCopy) *isCopy = JNI_TRUE; \
   DTRACE_PROBE1(hotspot_jni, Get##Result##ArrayElements__return, result);\
   return result; \
 JNI_END
@@ -3628,11 +3641,16 @@
      * Avoid asserts in typeArrayOop. */ \
     result = (ElementType*)get_bad_address(); \
   } else { \
-    result = NEW_C_HEAP_ARRAY(ElementType, len, mtInternal); \
-    /* copy the array to the c chunk */ \
-    memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \
+    /* JNI Specification states return NULL on OOM */                    \
+    result = NEW_C_HEAP_ARRAY_RETURN_NULL(ElementType, len, mtInternal); \
+    if (result != NULL) {                                                \
+      /* copy the array to the c chunk */                                \
+      memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len);      \
+      if (isCopy) {                                                      \
+        *isCopy = JNI_TRUE;                                              \
+      }                                                                  \
+    }                                                                    \
   } \
-  if (isCopy) *isCopy = JNI_TRUE; \
   ReturnProbe; \
   return result; \
 JNI_END