From 584d589041f63fdd3ea777019679275657902c2d Mon Sep 17 00:00:00 2001
From: "kr.angelov" <kr.angelov@gmail.com>
Date: Mon, 11 Aug 2014 10:59:10 +0000
Subject: a partial support for def rules in the C runtime

The def rules are now compiled to byte code by the compiler and then to
native code by the JIT compiler in the runtime. Not all constructions
are implemented yet. The partial implementation is now in the repository
but it is not activated by default since this requires changes in the
PGF format. I will enable it only after it is complete.
---
 src/runtime/haskell/PGF/ByteCode.hs | 47 +++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/runtime/haskell/PGF/ByteCode.hs

(limited to 'src/runtime/haskell/PGF/ByteCode.hs')

diff --git a/src/runtime/haskell/PGF/ByteCode.hs b/src/runtime/haskell/PGF/ByteCode.hs
new file mode 100644
index 000000000..b8e7d889d
--- /dev/null
+++ b/src/runtime/haskell/PGF/ByteCode.hs
@@ -0,0 +1,47 @@
+module PGF.ByteCode(CodeLabel, Instr(..), ppCode, ppInstr) where
+
+import PGF.CId
+import Text.PrettyPrint
+
+type CodeLabel = Int
+
+data Instr
+  = EVAL   {-# UNPACK #-} !Int
+  | CASE CId     {-# UNPACK #-} !CodeLabel
+  | CASE_INT Int    {-# UNPACK #-} !CodeLabel
+  | CASE_STR String {-# UNPACK #-} !CodeLabel
+  | CASE_FLT Double {-# UNPACK #-} !CodeLabel
+  | ALLOC  {-# UNPACK #-} !Int
+  | PUT_CONSTR CId
+  | PUT_CLOSURE   {-# UNPACK #-} !CodeLabel
+  | PUT_INT {-# UNPACK #-} !Int
+  | PUT_STR String
+  | PUT_FLT {-# UNPACK #-} !Double
+  | SET_VALUE {-# UNPACK #-} !Int
+  | SET_VARIABLE    {-# UNPACK #-} !Int
+  | TAIL_CALL    CId
+  | FAIL
+  | RET {-# UNPACK #-} !Int
+
+ppCode :: CodeLabel -> [Instr] -> Doc
+ppCode l []     = empty
+ppCode l (i:is) = ppLabel l <+> ppInstr l i $$ ppCode (l+1) is
+
+ppInstr l (EVAL         n) = text "EVAL        " <+> int n
+ppInstr l (CASE id o     ) = text "CASE        " <+> ppCId id <+> ppLabel (l+o+1)
+ppInstr l (CASE_INT n o  ) = text "CASE_INT    " <+> int n <+> ppLabel (l+o+1)
+ppInstr l (CASE_STR s o  ) = text "CASE_STR    " <+> text (show s) <+> ppLabel (l+o+1)
+ppInstr l (CASE_FLT d o  ) = text "CASE_FLT    " <+> double d <+> ppLabel (l+o+1)
+ppInstr l (ALLOC        n) = text "ALLOC       " <+> int n
+ppInstr l (SET_VALUE    n) = text "SET_VALUE   " <+> int n
+ppInstr l (PUT_CONSTR  id) = text "PUT_CONSTR  " <+> ppCId id
+ppInstr l (PUT_CLOSURE  c) = text "PUT_CLOSURE " <+> ppLabel c
+ppInstr l (PUT_INT n     ) = text "PUT_INT     " <+> int n
+ppInstr l (PUT_STR s     ) = text "PUT_STR     " <+> text (show s)
+ppInstr l (PUT_FLT d     ) = text "PUT_FLT     " <+> double d
+ppInstr l (SET_VARIABLE n) = text "SET_VARIABLE" <+> int n
+ppInstr l (TAIL_CALL   id) = text "TAIL_CALL   " <+> ppCId id
+ppInstr l (FAIL          ) = text "FAIL"
+ppInstr l (RET          n) = text "RET         " <+> int n
+
+ppLabel l = text (let s = show l in replicate (4-length s) '0' ++ s)
-- 
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