Backed out changeset 97977f224aff due to build breakage

js/src/jsopcode.cpp

@@ -75,14 +75,6 @@
 # include "jsnum.h"
 #endif
 
-#include "jsautooplen.h"
-
-/* Verify JSOP_XXX_LENGTH constant definitions. */
-#define OPDEF(op,val,name,token,length,nuses,ndefs,prec,format)               \
-    JS_STATIC_ASSERT(op##_LENGTH == length);
-#include "jsopcode.tbl"
-#undef OPDEF
-
 static const char js_incop_strs[][3] = {"++", "--"};
 
 const JSCodeSpec js_CodeSpec[] = {
@@ -2160,6 +2152,14 @@ Decompile(SprintStack *ss, jsbytecode *pc, intN nb, JSOp nextop)
                 todo = -2;
                 break;
 
+              case JSOP_SWAP:
+                /*
+                 * We don't generate this opcode currently, and previously we
+                 * did not need to decompile it.  If old, serialized bytecode
+                 * uses it still, we should fall through and set todo = -2.
+                 */
+                /* FALL THROUGH */
+
               case JSOP_GOSUB:
               case JSOP_GOSUBX:
                 /*
@@ -4993,7 +4993,8 @@ DecompileExpression(JSContext *cx, JSScript *script, JSFunction *fun,
 
     /* None of these stack-writing ops generates novel values. */
     JS_ASSERT(op != JSOP_CASE && op != JSOP_CASEX &&
-              op != JSOP_DUP && op != JSOP_DUP2);
+              op != JSOP_DUP && op != JSOP_DUP2 &&
+              op != JSOP_SWAP);
 
     /*
      * |this| could convert to a very long object initialiser, so cite it by
@@ -5273,6 +5274,13 @@ ReconstructPCStack(JSContext *cx, JSScript *script, jsbytecode *pc,
             pcstack[pcdepth + 3] = pcstack[pcdepth + 1];
             break;
 
+          case JSOP_SWAP:
+            JS_ASSERT(ndefs == 2);
+            pc2 = pcstack[pcdepth];
+            pcstack[pcdepth] = pcstack[pcdepth + 1];
+            pcstack[pcdepth + 1] = pc2;
+            break;
+
           case JSOP_LEAVEBLOCKEXPR:
             /*
              * The decompiler wants to see [leaveblockexpr] on pcstack, not