Start implementing MachineCodeEmitter
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4870 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86CodeEmitter.cpp b/lib/Target/X86/X86CodeEmitter.cpp
index ba82503..ff6b4c6 100644
--- a/lib/Target/X86/X86CodeEmitter.cpp
+++ b/lib/Target/X86/X86CodeEmitter.cpp
@@ -8,6 +8,8 @@
#include "X86TargetMachine.h"
#include "llvm/PassManager.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstr.h"
namespace {
struct Emitter : public FunctionPass {
@@ -15,10 +17,11 @@
MachineCodeEmitter &MCE;
Emitter(TargetMachine &tm, MachineCodeEmitter &mce) : TM(tm), MCE(mce) {}
- ~Emitter() {
- }
- bool runOnFunction(Function &F) { return false; }
+ bool runOnFunction(Function &F);
+
+ void emitBasicBlock(MachineBasicBlock &MBB);
+ void emitInstruction(MachineInstr &MI);
};
}
@@ -34,3 +37,33 @@
PM.add(new Emitter(*this, MCE));
return false;
}
+
+bool Emitter::runOnFunction(Function &F) {
+ MachineFunction &MF = MachineFunction::get(&F);
+
+ MCE.startFunction(MF);
+ for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
+ emitBasicBlock(*I);
+ MCE.finishFunction(MF);
+ return false;
+}
+
+void Emitter::emitBasicBlock(MachineBasicBlock &MBB) {
+ MCE.startBasicBlock(MBB);
+ for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
+ emitInstruction(**I);
+}
+
+void Emitter::emitInstruction(MachineInstr &MI) {
+ unsigned Opcode = MI.getOpcode();
+ const MachineInstrDescriptor &Desc = TM.getInstrInfo().get(Opcode);
+
+ // Emit instruction prefixes if neccesary
+ if (Desc.TSFlags & X86II::OpSize) MCE.emitByte(0x66);// Operand size...
+ if (Desc.TSFlags & X86II::TB) MCE.emitByte(0x0F); // Two-byte opcode prefix
+
+ switch (Desc.TSFlags & X86II::FormMask) {
+ case X86II::RawFrm:
+ ;
+ }
+}