Author: Armin Rigo <[email protected]>
Branch: continulet-jit-3
Changeset: r57385:27968d877bae
Date: 2012-09-19 14:33 +0200
http://bitbucket.org/pypy/pypy/changeset/27968d877bae/
Log: The JITFRAME object type
diff --git a/pypy/jit/metainterp/jitframe.py b/pypy/jit/metainterp/jitframe.py
new file mode 100644
--- /dev/null
+++ b/pypy/jit/metainterp/jitframe.py
@@ -0,0 +1,40 @@
+from pypy.rpython.lltypesystem import lltype, llmemory, rffi
+
+
+GCINDEXLIST = lltype.GcArray(rffi.UINT)
+
+JITFRAME = lltype.GcStruct('JITFRAME',
+ ('gcindexlist', lltype.Ptr(GCINDEXLIST)),
+ ('items', lltype.Array(llmemory.Address)))
+JITFRAMEPTR = lltype.Ptr(JITFRAME)
+
+# ____________________________________________________________
+
+FRAME_ITERATOR = lltype.GcStruct('FRAME_ITERATOR',
+ ('remaining_indices', lltype.Signed))
+frame_iterator = lltype.malloc(FRAME_ITERATOR, immortal=True)
+
+GCINDEXLIST_OFS = llmemory.offsetof(JITFRAME, 'gcindexlist')
+ITEMS_BASE_OFS = (llmemory.offsetof(JITFRAME, 'items') +
+ llmemory.itemoffsetof(JITFRAME.items))
+SIZE_OF_ADDR = llmemory.sizeof(llmemory.Address)
+
+def customtrace(obj, prev):
+ gcindexlist = llmemory.cast_adr_to_ptr(obj, JITFRAMEPTR).gcindexlist
+ if not prev:
+ # return first the address of the 'gcindexlist' field
+ frame_iterator.remaining_indices = len(gcindexlist)
+ return obj + GCINDEXLIST_OFS
+ elif frame_iterator.remaining_indices > 0:
+ # return next the addresses of '.items[n]', for n in gcindexlist
+ frame_iterator.remaining_indices -= 1
+ n = gcindexlist[frame_iterator.remaining_indices]
+ n = lltype.cast_primitive(lltype.Signed, n)
+ return obj + ITEMS_BASE_OFS + n * SIZE_OF_ADDR
+ else:
+ return llmemory.NULL
+
+CUSTOMTRACEFUNC = lltype.FuncType([llmemory.Address, llmemory.Address],
+ llmemory.Address)
+customtraceptr = llhelper(lltype.Ptr(CUSTOMTRACEFUNC), customtrace)
+lltype.attachRuntimeTypeInfo(SHADOWSTACKREF, customtraceptr=customtraceptr)
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