[GlobalISel] More detailed skeleton for the IRTranslator.

llvm-svn: 260456

1 files changed, 31 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index efb4ead0a94..704b01966f7 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -12,20 +12,39 @@
 
 #include "llvm/CodeGen/GlobalISel/IRTranslator.h"
 
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/IR/Function.h"
+
+#define DEBUG_TYPE "irtranslator"
+
 using namespace llvm;
 
 char IRTranslator::ID = 0;
 
 bool IRTranslator::translateADD(const Instruction &Inst) {
+  // Get or create a virtual register for each value.
+  // Unless the value is a Constant => loadimm cst?
+  // or inline constant each time?
+  // Creation of a virtual register needs to have a size.
   return false;
 }
 
-bool IRTranslator::translate(const Instruction &) {
-  return false;
+bool IRTranslator::translate(const Instruction &Inst) {
+  switch(Inst.getOpcode()) {
+    case Instruction::Add: {
+      return translateADD(Inst);
+    default:
+      llvm_unreachable("Opcode not supported");
+    }
+  }
 }
 
 
 void IRTranslator::finalize() {
+  // Release the memory used by the different maps we
+  // needed during the translation.
+  ValToVRegs.clear();
+  Constants.clear();
 }
 
 IRTranslator::IRTranslator()
@@ -33,5 +52,15 @@ IRTranslator::IRTranslator()
 }
 
 bool IRTranslator::runOnMachineFunction(MachineFunction &MF) {
+  const Function &F = *MF.getFunction();
+  for (const BasicBlock &BB: F) {
+    for (const Instruction &Inst: BB) {
+      bool Succeeded = translate(Inst);
+      if (!Succeeded) {
+        DEBUG(dbgs() << "Cannot translate: " << Inst << '\n');
+        report_fatal_error("Unable to translate instruction");
+      }
+    }
+  }
   return false;
 }