[PATCH 3/4] Add tests for gdb.Value(bufobj, type) constructor

[Kevin Buettner <kevinb@redhat.com>]

gdb/testsuite/ChangeLog:
    
            * gdb.python/py-value.exp (test_value_from_buffer): New proc with
            call from main program.
---
 gdb/testsuite/gdb.python/py-value.exp | 42 +++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/gdb/testsuite/gdb.python/py-value.exp b/gdb/testsuite/gdb.python/py-value.exp
index 4f04aa9417..ba7de2166e 100644
--- a/gdb/testsuite/gdb.python/py-value.exp
+++ b/gdb/testsuite/gdb.python/py-value.exp
@@ -510,6 +510,47 @@ proc test_float_conversion {} {
     gdb_test "python print(float(gdb.Value(0)))" "0\\.0"
 }
 
+proc test_value_from_buffer {} {
+  global gdb_prompt
+  global gdb_py_is_py3k
+
+  gdb_py_test_silent_cmd "python tp=gdb.lookup_type('int')" "look up int type" 0
+  gdb_py_test_silent_cmd "python size_a=gdb.parse_and_eval('sizeof(a)')" \
+                         "find size of a" 0
+  gdb_py_test_silent_cmd "python size_a0=gdb.parse_and_eval('sizeof(a\[0\])')" \
+                         "find size of element of a" 0
+  gdb_py_test_silent_cmd "python addr=gdb.parse_and_eval('&a')" \
+                         "find address of a" 0
+  gdb_py_test_silent_cmd "python b=gdb.selected_inferior().read_memory(addr,size_a)" \
+                         "read buffer from memory" 1
+  gdb_test "python v=gdb.Value(b,tp); print(v)" "1" \
+            "construct value from buffer"
+  gdb_test "python v=gdb.Value(b\[size_a0:\],tp); print(v)" "2" \
+            "convert 2nd elem of buffer to value"
+  gdb_test "python v=gdb.Value(b\[2*size_a0:\],tp); print(v)" "3" \
+           "convert 3rd elem of buffer to value"
+  gdb_test "python v=gdb.Value(b\[2*size_a0+1:\],tp); print(v)" \
+           "TypeError: Size of type is larger than that of buffer object\..*" \
+	   "attempt to convert smaller buffer than size of type"
+  gdb_py_test_silent_cmd "python atp=tp.array(2) ; print(atp)" \
+                         "make array type" 0
+  gdb_py_test_silent_cmd "python va=gdb.Value(b,atp)" \
+                         "construct array value from buffer" 0
+  gdb_test "python print(va)" "\\{1, 2, 3\\}" "print array value"
+  gdb_test "python print(va\[0\])" "1" "print first array element"
+  gdb_test "python print(va\[1\])" "2" "print second array element"
+  gdb_test "python print(va\[2\])" "3" "print third array element"
+  gdb_test "python print(va\[3\])" "gdb\.error: no such vector element.*" \
+           "print out of bounds array element"
+  gdb_py_test_silent_cmd "python atpbig=tp.array(3)" "make bigger array type" 0
+  gdb_test "python vabig=gdb.Value(b,atpbig)" \
+           "TypeError: Size of type is larger than that of buffer object\..*" \
+	   "attempt to construct large value with small buffer" 
+  gdb_test "python v=gdb.Value(2048,tp)" \
+           "TypeError: Object must support the python buffer protocol\..*" \
+           "attempt to construct value from buffer with non-buffer object"
+}
+
 # Build C version of executable.  C++ is built later.
 if { [build_inferior "${binfile}" "c"] < 0 } {
     return -1
@@ -538,6 +579,7 @@ if ![runto_main] then {
 }
 
 test_value_in_inferior
+test_value_from_buffer
 test_inferior_function_call
 test_value_after_death