[PATCH] Fix FFI return type for closures in the java interpreter

[Matthew Fortune <Matthew.Fortune@imgtec.com>]

Hi,

I've identified a latent bug in the java interpreter that affects MIPS
n32 and n64 ABIs both little and big endian and, I presume, any 64-bit
big endian target with int as 32-bit.

A full description is in my original post:

https://gcc.gnu.org/ml/java-patches/2016-q2/msg00020.html

Patch tested on x86_64-pc-linux-gnu where the new testcase works both
before and after with no regressions. Also tested on mips64el-linux-gnu
where the test fails before and works after with no regressions.

Aurelien provided the test case and I tried to follow an existing test
to integrate it. Let me know if there is anything else I need to do.

I mentioned in my earlier post about a possible similar issue in the
lang/reflect/natVMProxy.cc code (unbox function) by code inspection. I
don't know how to trigger this code but perhaps someone can advise.

OK to commit?

Thanks,
Matthew

libjava/

	* interpret-run.cc: Use ffi_arg for FFI integer return types.

libjava/testsuite/

	* libjava.jar/arraysort.java: New file.
	* libjava.jar/arraysort.jar: New file.
	* libjava.jar/arraysort.out: New file.
	* libjava.jar/arraysort.xfail: New file.
---
 libjava/interpret-run.cc                      |   2 +-
 libjava/testsuite/libjava.jar/arraysort.jar   | Bin 0 -> 1864 bytes
 libjava/testsuite/libjava.jar/arraysort.java  |  44 ++++++++++++++++++++++++++
 libjava/testsuite/libjava.jar/arraysort.out   |  10 ++++++
 libjava/testsuite/libjava.jar/arraysort.xfail |   1 +
 5 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100644 libjava/testsuite/libjava.jar/arraysort.jar
 create mode 100644 libjava/testsuite/libjava.jar/arraysort.java
 create mode 100644 libjava/testsuite/libjava.jar/arraysort.out
 create mode 100644 libjava/testsuite/libjava.jar/arraysort.xfail

diff --git a/libjava/interpret-run.cc b/libjava/interpret-run.cc
index a4c2d4d..6be354e 100644
--- a/libjava/interpret-run.cc
+++ b/libjava/interpret-run.cc
@@ -1838,7 +1838,7 @@ details.  */
       return;
 
     insn_ireturn:
-      *(jint *) retp = POPI ();
+      *(ffi_arg *) retp = POPI ();
       return;
 
     insn_return:
diff --git a/libjava/testsuite/libjava.jar/arraysort.jar b/libjava/testsuite/libjava.jar/arraysort.jar
new file mode 100644
index 0000000000000000000000000000000000000000..ee051e45a836f99563e3e15ce748795d01e87e4e
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diff --git a/libjava/testsuite/libjava.jar/arraysort.java b/libjava/testsuite/libjava.jar/arraysort.java
new file mode 100644
index 0000000..56c181d
--- /dev/null
+++ b/libjava/testsuite/libjava.jar/arraysort.java
@@ -0,0 +1,44 @@
+import java.util.Arrays;
+import java.util.Comparator;
+
+public class arraysort
+{
+  private static final Comparator<String> STRING_COMPARATOR = new Comparator<String>()
+  {
+    public int compare(String str1, String str2)
+    {
+      return str1.compareTo(str2);
+    }
+  };
+
+  static void dumpArray(String[] strings)
+  {
+    int i;
+
+    for (i = 0 ; i < strings.length ; i++)
+    {
+      System.out.println("[" + i + "] " + strings[i]);
+    }
+  }
+
+  public static void main(String[] args)
+  {
+    String[] strings;
+
+    strings = new String[4];
+
+    strings[0] = "a";
+    strings[1] = "c";
+    strings[2] = "b";
+    strings[3] = "d";
+
+    System.out.println("Array of string, before:");
+    dumpArray(strings);
+
+    Arrays.sort(strings, STRING_COMPARATOR);
+
+    System.out.println("Array of string, after:");
+    dumpArray(strings);
+  }
+}
+
diff --git a/libjava/testsuite/libjava.jar/arraysort.out b/libjava/testsuite/libjava.jar/arraysort.out
new file mode 100644
index 0000000..938ce9f
--- /dev/null
+++ b/libjava/testsuite/libjava.jar/arraysort.out
@@ -0,0 +1,10 @@
+Array of string, before:
+[0] a
+[1] c
+[2] b
+[3] d
+Array of string, after:
+[0] a
+[1] b
+[2] c
+[3] d
diff --git a/libjava/testsuite/libjava.jar/arraysort.xfail b/libjava/testsuite/libjava.jar/arraysort.xfail
new file mode 100644
index 0000000..2bbbe56
--- /dev/null
+++ b/libjava/testsuite/libjava.jar/arraysort.xfail
@@ -0,0 +1 @@
+main=arraysort
-- 
2.4.1