Initial revision

1 files changed, 176 insertions, 0 deletions

diff --git a/Lib/dis.py b/Lib/dis.py
new file mode 100644
index 0000000..fe57fb9
--- /dev/null
+++ b/Lib/dis.py
@@ -0,0 +1,176 @@
+# Disassembler
+
+import sys
+import string
+
+def dis():
+	tb = sys.last_traceback
+	while tb.tb_next: tb = tb.tb_next
+	distb(tb)
+
+def distb(tb):
+	disassemble(tb.tb_frame.f_code, tb.tb_lasti)
+
+def disco(co):
+	disassemble(co, -1)
+
+def disassemble(co, lasti):
+	code = co.co_code
+	labels = findlabels(code)
+	n = len(code)
+	i = 0
+	while i < n:
+		c = code[i]
+		op = ord(c)
+		if op = SET_LINENO and i > 0: print # Extra blank line
+		if i = lasti: print '-->',
+		else: print '   ',
+		if i in labels: print '>>',
+		else: print '  ',
+		print string.rjust(`i`, 4),
+		print string.ljust(opname[op], 15),
+		i = i+1
+		if op >= HAVE_ARGUMENT:
+			oparg = ord(code[i]) + ord(code[i+1])*256
+			i = i+2
+			print string.rjust(`oparg`, 5),
+			if op in hasconst:
+				print '(' + `co.co_consts[oparg]` + ')',
+			elif op in hasname:
+				print '(' + co.co_names[oparg] + ')',
+			elif op in hasjrel:
+				print '(to ' + `i + oparg` + ')',
+		print
+
+def findlabels(code):
+	labels = []
+	n = len(code)
+	i = 0
+	while i < n:
+		c = code[i]
+		op = ord(c)
+		i = i+1
+		if op >= HAVE_ARGUMENT:
+			oparg = ord(code[i]) + ord(code[i+1])*256
+			i = i+2
+			label = -1
+			if op in hasjrel:
+				label = i+oparg
+			elif op in hasjabs:
+				label = oparg
+			if label >= 0:
+				if label not in labels:
+					labels.append(label)
+	return labels
+
+hasconst = []
+hasname = []
+hasjrel = []
+hasjabs = []
+
+opname = range(256)
+for op in opname: opname[op] = '<' + `op` + '>'
+
+def def_op(name, op):
+	opname[op] = name
+
+def name_op(name, op):
+	opname[op] = name
+	hasname.append(op)
+
+def jrel_op(name, op):
+	opname[op] = name
+	hasjrel.append(op)
+
+def jabs_op(name, op):
+	opname[op] = name
+	hasjabs.append(op)
+
+# Instruction opcodes for compiled code
+
+def_op('STOP_CODE', 0)
+def_op('POP_TOP', 1)
+def_op('ROT_TWO', 2)
+def_op('ROT_THREE', 3)
+def_op('DUP_TOP', 4)
+
+def_op('UNARY_POSITIVE', 10)
+def_op('UNARY_NEGATIVE', 11)
+def_op('UNARY_NOT', 12)
+def_op('UNARY_CONVERT', 13)
+def_op('UNARY_CALL', 14)
+
+def_op('BINARY_MULTIPLY', 20)
+def_op('BINARY_DIVIDE', 21)
+def_op('BINARY_MODULO', 22)
+def_op('BINARY_ADD', 23)
+def_op('BINARY_SUBTRACT', 24)
+def_op('BINARY_SUBSCR', 25)
+def_op('BINARY_CALL', 26)
+
+def_op('SLICE+0', 30)
+def_op('SLICE+1', 31)
+def_op('SLICE+2', 32)
+def_op('SLICE+3', 33)
+
+def_op('STORE_SLICE+0', 40)
+def_op('STORE_SLICE+1', 41)
+def_op('STORE_SLICE+2', 42)
+def_op('STORE_SLICE+3', 43)
+
+def_op('DELETE_SLICE+0', 50)
+def_op('DELETE_SLICE+1', 51)
+def_op('DELETE_SLICE+2', 52)
+def_op('DELETE_SLICE+3', 53)
+
+def_op('STORE_SUBSCR', 60)
+def_op('DELETE_SUBSCR', 61)
+
+def_op('PRINT_EXPR', 70)
+def_op('PRINT_ITEM', 71)
+def_op('PRINT_NEWLINE', 72)
+
+def_op('BREAK_LOOP', 80)
+def_op('RAISE_EXCEPTION', 81)
+def_op('LOAD_LOCALS', 82)
+def_op('RETURN_VALUE', 83)
+def_op('REQUIRE_ARGS', 84)
+def_op('REFUSE_ARGS', 85)
+def_op('BUILD_FUNCTION', 86)
+def_op('POP_BLOCK', 87)
+def_op('END_FINALLY', 88)
+def_op('BUILD_CLASS', 89)
+
+HAVE_ARGUMENT = 90		# Opcodes from here have an argument: 
+
+name_op('STORE_NAME', 90)	# Index in name list 
+name_op('DELETE_NAME', 91)	# "" 
+def_op('UNPACK_TUPLE', 92)	# Number of tuple items 
+def_op('UNPACK_LIST', 93)	# Number of list items 
+# unused:		94
+name_op('STORE_ATTR', 95)	# Index in name list 
+name_op('DELETE_ATTR', 96)	# "" 
+
+def_op('LOAD_CONST', 100)	# Index in const list 
+hasconst.append(100)
+name_op('LOAD_NAME', 101)	# Index in name list 
+def_op('BUILD_TUPLE', 102)	# Number of tuple items 
+def_op('BUILD_LIST', 103)	# Number of list items 
+def_op('BUILD_MAP', 104)	# Always zero for now 
+name_op('LOAD_ATTR', 105)	# Index in name list 
+def_op('COMPARE_OP', 106)	# Comparison operator 
+name_op('IMPORT_NAME', 107)	# Index in name list 
+name_op('IMPORT_FROM', 108)	# Index in name list 
+
+jrel_op('JUMP_FORWARD', 110)	# Number of bytes to skip 
+jrel_op('JUMP_IF_FALSE', 111)	# "" 
+jrel_op('JUMP_IF_TRUE', 112)	# "" 
+jabs_op('JUMP_ABSOLUTE', 113)	# Target byte offset from beginning of code 
+jrel_op('FOR_LOOP', 114)	# Number of bytes to skip 
+
+jrel_op('SETUP_LOOP', 120)	# Distance to target address
+jrel_op('SETUP_EXCEPT', 121)	# ""
+jrel_op('SETUP_FINALLY', 122)	# ""
+
+def_op('SET_LINENO', 127)	# Current line number
+SET_LINENO = 127