Subzero: Partial implementation of global initializers.

src/llvm2ice.cpp

Index: src/llvm2ice.cpp
diff --git a/src/llvm2ice.cpp b/src/llvm2ice.cpp
index c3a98dfed6b2d13a06f6dbeeb054d700990864ab..523b6d3f8b58fa2b5c75bac8c8e63cd9dcd1b2eb 100644
--- a/src/llvm2ice.cpp
+++ b/src/llvm2ice.cpp
@@ -726,6 +726,48 @@ int main(int argc, char **argv) {
   raw_os_ostream *Ls = new raw_os_ostream(LogFilename == "-" ? std::cout : Lfs);
   Ls->SetUnbuffered();
 
+  Ice::GlobalContext Ctx(Ls, Os, VMask, TargetArch, OptLevel, TestPrefix);
+
+  OwningPtr<Ice::TargetGlobalInitLowering> GlobalLowering(
+      Ice::TargetGlobalInitLowering::createLowering(TargetArch, &Ctx));
+  for (Module::const_global_iterator I = Mod->global_begin(),
+                                     E = Mod->global_end();
+       I != E; ++I) {
+    if (!I->hasInitializer())
+      continue;
+    const Constant *Initializer = I->getInitializer();
+    Ice::IceString Name = I->getName();
+    unsigned Align = I->getAlignment();
+    uint64_t NumElements = 0;
+    const char *Data = NULL;
+    bool IsInternal = I->hasInternalLinkage();
+    bool IsConst = I->isConstant();
+    bool IsZeroInitializer = false;
+
+    if (const ConstantDataArray *CDA =
+            dyn_cast<ConstantDataArray>(Initializer)) {
+      NumElements = CDA->getNumElements();
+      assert(isa<IntegerType>(CDA->getElementType()) &&
+             cast<IntegerType>(CDA->getElementType())->getBitWidth() == 8);
+      Data = CDA->getRawDataValues().data();
+    } else if (isa<ConstantAggregateZero>(Initializer)) {
+      if (const ArrayType *AT = dyn_cast<ArrayType>(Initializer->getType())) {
+        assert(isa<IntegerType>(AT->getElementType()) &&
+               cast<IntegerType>(AT->getElementType())->getBitWidth() == 8);
+        NumElements = AT->getNumElements();
+        IsZeroInitializer = true;
+      } else {
+        llvm_unreachable("Unhandled constant aggregate zero type");
+      }
+    } else {
+      llvm_unreachable("Unhandled global initializer");
+    }
+
+    GlobalLowering->lower(Name, Align, IsInternal, IsConst, IsZeroInitializer,
+                          NumElements, Data, DisableTranslation);
+  }
+  GlobalLowering.reset();
+
   // Ideally, Func would be declared inside the loop and its object
   // would be automatically deleted at the end of the loop iteration.
   // However, emitting the constant pool requires a valid Cfg object,
@@ -735,7 +777,6 @@ int main(int argc, char **argv) {
   // object, change all Ice::Constant related functions to use
   // GlobalContext instead of Cfg, and then clean up this loop.
   OwningPtr<Ice::Cfg> Func;
-  Ice::GlobalContext Ctx(Ls, Os, VMask, TargetArch, OptLevel, TestPrefix);
 
   for (Module::const_iterator I = Mod->begin(), E = Mod->end(); I != E; ++I) {
     if (I->empty())