[llvm-commits] [llvm] r115993 - /llvm/trunk/lib/Target/ARM/ARMMCCodeEmitter.cpp

[Jim Grosbach]

Author: grosbach
Date: Thu Oct  7 17:12:50 2010
New Revision: 115993

URL: http://llvm.org/viewvc/llvm-project?rev=115993&view=rev
Log:
Trivial MC code emitter shell. No instruction forms actually handled yet.

Modified:
    llvm/trunk/lib/Target/ARM/ARMMCCodeEmitter.cpp

Modified: llvm/trunk/lib/Target/ARM/ARMMCCodeEmitter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMMCCodeEmitter.cpp?rev=115993&r1=115992&r2=115993&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMMCCodeEmitter.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMMCCodeEmitter.cpp Thu Oct  7 17:12:50 2010
@@ -13,13 +13,16 @@
 
 #define DEBUG_TYPE "arm-emitter"
 #include "ARM.h"
-#include "ARMBaseInfo.h"
+#include "ARMInstrInfo.h"
 #include "llvm/MC/MCCodeEmitter.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCInst.h"
+#include "llvm/ADT/Statistic.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
+STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
+
 namespace {
 class ARMMCCodeEmitter : public MCCodeEmitter {
   ARMMCCodeEmitter(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
@@ -31,7 +34,6 @@
 public:
   ARMMCCodeEmitter(TargetMachine &tm, MCContext &ctx)
     : TM(tm), TII(*TM.getInstrInfo()), Ctx(ctx) {
-    assert(0 && "ARMMCCodeEmitter::ARMMCCodeEmitter() not yet implemented.");
   }
 
   ~ARMMCCodeEmitter() {}
@@ -107,7 +109,21 @@
 void ARMMCCodeEmitter::
 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
                   SmallVectorImpl<MCFixup> &Fixups) const {
-  assert(0 && "ARMMCCodeEmitter::EncodeInstruction() not yet implemented.");
+  unsigned Opcode = MI.getOpcode();
+  const TargetInstrDesc &Desc = TII.get(Opcode);
+  uint64_t TSFlags = Desc.TSFlags;
+
+  // Pseudo instructions don't get encoded.
+  if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
+    return;
+
+  ++MCNumEmitted;  // Keep track of the # of mi's emitted
+  switch (TSFlags & ARMII::FormMask) {
+  default: {
+    llvm_unreachable("Unhandled instruction encoding format!");
+    break;
+  }
+  }
 }
 
 // FIXME: These #defines shouldn't be necessary. Instead, tblgen should