From 733b74c1a5c72afb485d1ed9826310319dee96e7 Mon Sep 17 00:00:00 2001
From: Ned Batchelder <ned@nedbatchelder.com>
Date: Sat, 10 Oct 2009 10:43:16 -0400
Subject: Need this too

---
 coverage/bytecode.py | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 coverage/bytecode.py

(limited to 'coverage/bytecode.py')

diff --git a/coverage/bytecode.py b/coverage/bytecode.py
new file mode 100644
index 00000000..0680a57f
--- /dev/null
+++ b/coverage/bytecode.py
@@ -0,0 +1,81 @@
+"""Bytecode manipulation for coverage.py"""
+
+import opcode, sys, types
+
+class ByteCode(object):
+    """A single bytecode."""
+    def __init__(self):
+        self.offset = -1
+        self.op = -1
+        self.oparg = -1
+        self.next_offset = -1
+        self.jump_to = -1
+
+
+class ByteCodes(object):
+    """Iterator over byte codes in `code`.
+    
+    Returns `ByteCode` objects.
+    
+    """
+    def __init__(self, code):
+        self.code = code
+        self.offset = 0
+        
+    if sys.hexversion > 0x03000000:
+        def byte_at(self, i):
+            return self.code[i]
+    else:
+        def byte_at(self, i):
+            return ord(self.code[i])
+
+    def __iter__(self):
+        return self
+    
+    def __next__(self):
+        if self.offset >= len(self.code):
+            raise StopIteration
+        
+        bc = ByteCode()
+        bc.op = self.byte_at(self.offset)
+        bc.offset = self.offset
+        
+        next_offset = self.offset+1
+        if bc.op >= opcode.HAVE_ARGUMENT:
+            bc.oparg = self.byte_at(self.offset+1) + 256*self.byte_at(self.offset+2)
+            next_offset += 2
+            
+            label = -1
+            if bc.op in opcode.hasjrel:
+                label = next_offset + bc.oparg
+            elif bc.op in opcode.hasjabs:
+                label = bc.oparg
+            bc.jump_to = label
+            
+        bc.next_offset = self.offset = next_offset
+        return bc
+    
+    next = __next__     # Py2k uses an old-style non-dunder name.
+
+
+class CodeObjects(object):
+    """Iterate over all the code objects in `code`."""
+    def __init__(self, code):
+        self.stack = [code]
+        
+    def __iter__(self):
+        return self
+    
+    def __next__(self):
+        if self.stack:
+            # We're going to return the code object on the stack, but first
+            # push its children for later returning.
+            code = self.stack.pop()
+            for c in code.co_consts:
+                if isinstance(c, types.CodeType):
+                    self.stack.append(c)
+            return code
+
+        raise StopIteration
+
+    next = __next__
-- 
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