set up some infrastructure, some minor cleanups.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95260 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86MCCodeEmitter.cpp b/lib/Target/X86/X86MCCodeEmitter.cpp
index 0578c6d..d5613b2 100644
--- a/lib/Target/X86/X86MCCodeEmitter.cpp
+++ b/lib/Target/X86/X86MCCodeEmitter.cpp
@@ -13,23 +13,31 @@
#define DEBUG_TYPE "x86-emitter"
#include "X86.h"
-#include "X86TargetMachine.h"
+#include "X86InstrInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
class X86MCCodeEmitter : public MCCodeEmitter {
X86MCCodeEmitter(const X86MCCodeEmitter &); // DO NOT IMPLEMENT
void operator=(const X86MCCodeEmitter &); // DO NOT IMPLEMENT
- X86TargetMachine &TM;
+ const TargetMachine &TM;
+ const TargetInstrInfo &TII;
public:
- X86MCCodeEmitter(X86TargetMachine &tm) : TM(tm) {
+ X86MCCodeEmitter(TargetMachine &tm)
+ : TM(tm), TII(*TM.getInstrInfo()) {
}
~X86MCCodeEmitter() {}
- void EncodeInstruction(const MCInst &MI, raw_ostream &OS) const {
+ void EmitByte(unsigned char C, raw_ostream &OS) const {
+ OS << (char)C;
}
+
+ void EncodeInstruction(const MCInst &MI, raw_ostream &OS) const;
+
};
} // end anonymous namespace
@@ -37,5 +45,31 @@
MCCodeEmitter *llvm::createX86MCCodeEmitter(const Target &,
TargetMachine &TM) {
- return new X86MCCodeEmitter(static_cast<X86TargetMachine&>(TM));
+ return new X86MCCodeEmitter(TM);
+}
+
+
+
+void X86MCCodeEmitter::
+EncodeInstruction(const MCInst &MI, raw_ostream &OS) const {
+ unsigned Opcode = MI.getOpcode();
+ const TargetInstrDesc &Desc = TII.get(Opcode);
+
+ // Emit the lock opcode prefix as needed.
+ if (Desc.TSFlags & X86II::LOCK)
+ EmitByte(0xF0, OS);
+
+ // Emit segment override opcode prefix as needed.
+ switch (Desc.TSFlags & X86II::SegOvrMask) {
+ default: assert(0 && "Invalid segment!");
+ case 0: break; // No segment override!
+ case X86II::FS:
+ EmitByte(0x64, OS);
+ break;
+ case X86II::GS:
+ EmitByte(0x65, OS);
+ break;
+ }
+
+
}