X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;ds=sidebyside;f=utils%2FTableGen%2FCodeEmitterGen.cpp;h=40065bf009cec59f9dd525ca8914f0348da63ff8;hb=eb178c146a0f56cca8421eda9fb6ed2a8c73a2b4;hp=6cf18c2ded9e37b091ce2338616d047dd95ba645;hpb=2082ebe8b3a5db302748828ab4f79a36d239c1d9;p=oota-llvm.git

diff --git a/utils/TableGen/CodeEmitterGen.cpp b/utils/TableGen/CodeEmitterGen.cpp
index 6cf18c2ded9..40065bf009c 100644
--- a/utils/TableGen/CodeEmitterGen.cpp
+++ b/utils/TableGen/CodeEmitterGen.cpp
@@ -7,7 +7,9 @@
 // 
 //===----------------------------------------------------------------------===//
 //
-// FIXME: Document.
+// CodeEmitterGen uses the descriptions of instructions and their fields to
+// construct an automated code emitter: a function that, given a MachineInstr,
+// returns the (currently, 32-bit unsigned) value of the instruction.
 //
 //===----------------------------------------------------------------------===//
 
@@ -21,8 +23,9 @@ void CodeEmitterGen::run(std::ostream &o) {
 
   EmitSourceFileHeader("Machine Code Emitter", o);
 
-  std::string Namespace = "V9::";
-  std::string ClassName = "SparcV9CodeEmitter::";
+  std::string Namespace = Insts[0]->getValueAsString("Namespace") + "::";
+  std::string ClassName = Insts[0]->getValueAsString("ClassPrefix") + 
+    "CodeEmitter::";
 
   //const std::string &Namespace = Inst->getValue("Namespace")->getName();
   o << "unsigned " << ClassName
@@ -152,7 +155,7 @@ void CodeEmitterGen::run(std::ostream &o) {
               << " &= (1<<" << beginBitInVar+1 << ") - 1;\n";
             
             // Shift the value to the correct place (according to place in inst)
-            assert(endBitInInst >= 0 && "Negative shift amount in inst position!");
+            assert(endBitInInst >= 0 && "Negative shift amount!");
             if (endBitInInst != 0)
               o << "      op" << OpOrder[Vals[i].getName()]
               << " <<= " << endBitInInst << ";\n";
@@ -175,14 +178,12 @@ void CodeEmitterGen::run(std::ostream &o) {
         // Scan through the field looking for bit initializers of the current
         // variable...
         for (int i = FieldInitializer->getNumBits()-1; i >= 0; --i) {
-          if (BitInit *BI = dynamic_cast<BitInit*>(FieldInitializer->getBit(i)))
-          {
+          Init *I = FieldInitializer->getBit(i);
+          if (BitInit *BI = dynamic_cast<BitInit*>(I)) {
             DEBUG(o << "      // bit init: f: " << f << ", i: " << i << "\n");
-          } else if (UnsetInit *UI =
-                     dynamic_cast<UnsetInit*>(FieldInitializer->getBit(i))) {
+          } else if (UnsetInit *UI = dynamic_cast<UnsetInit*>(I)) {
             DEBUG(o << "      // unset init: f: " << f << ", i: " << i << "\n");
-          } else if (VarBitInit *VBI =
-                     dynamic_cast<VarBitInit*>(FieldInitializer->getBit(i))) {
+          } else if (VarBitInit *VBI = dynamic_cast<VarBitInit*>(I)) {
             TypedInit *TI = VBI->getVariable();
             if (VarInit *VI = dynamic_cast<VarInit*>(TI)) {
               // If the bits of the field are laid out consecutively in the