[Courgette] Initial Implementation of LabelManager.

courgette/image_utils.h

Index: courgette/image_utils.h
diff --git a/courgette/image_utils.h b/courgette/image_utils.h
index c016357732d05745c3487a317b1eab98d91fa840..38bd93db8d2cbd7cba6a3a7f4123dd108e512248 100644
--- a/courgette/image_utils.h
+++ b/courgette/image_utils.h
@@ -15,6 +15,26 @@ namespace courgette {
 
 typedef uint32 RVA;
 
+// A Label is a symbolic reference to an address.  Unlike a conventional
+// assembly language, we always know the address.  The address will later be
+// stored in a table and the Label will be replaced with the index into the
+// table.
+// TODO(huangs): Make this a struct, and remove "_" from member names.
+class Label {
+ public:
+  enum : int { kNoIndex = -1 };
+  explicit Label(RVA rva) : rva_(rva) {}
+
+  bool operator==(const Label& other) const {
+    return rva_ == other.rva_ && index_ == other.index_ &&
+        count_ == other.count_;
+  }
+
+  RVA rva_ = 0;           // Address referred to by the label.
+  int index_ = kNoIndex;  // Index of address in address table.
+  int32 count_ = 0;

[grt (UTC plus 2), 2015/12/04 19:33:41]

note that all new code should #include <stdint.h> and use the standard int32_t
rather than int32. since the old types are used everywhere else, i don't expect
you to change them all, just bringing this to your attention in case you didn't
know about it for use in future coding adventures. :-)

[huangs, 2015/12/04 20:01:13]

Ah okay. Thanks for the info!

+};
+
 // These helper functions avoid the need for casts in the main code.
 inline uint16 ReadU16(const uint8* address, size_t offset) {
   return *reinterpret_cast<const uint16*>(address + offset);