Start processing function blocks in Subzero.

src/IceTypeConverter.h

+//===- subzero/src/IceTypeConverter.h - Convert ICE/LLVM Types --*- C++ -*-===//
+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines how to convert LLVM types to ICE types, and ICE types
+// to LLVM types.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_ICETYPECONVERTER_H
+#define SUBZERO_SRC_ICETYPECONVERTER_H
+
+#include "IceDefs.h"
+#include "IceTypes.h"
+#include "llvm/IR/DerivedTypes.h"
+
+namespace llvm {
+class LLVMContext;
+} // end of llvm namespace.
+
+namespace Ice {
+
+/// Converts LLVM types to ICE types, and ICE types to LLVM types.
+class TypeConverter {
+  TypeConverter(const TypeConverter&) LLVM_DELETED_FUNCTION;
+  TypeConverter &operator=(const TypeConverter&) LLVM_DELETED_FUNCTION;
+public:
+  /// Context is the context to use to build llvm types.
+  TypeConverter(llvm::LLVMContext &Context);
+
+  /// Returns the LLVM type for the corresponding ICE type Ty.
+  llvm::Type *convertToLLVMType(Type Ty) const {
+    // Note: We use "at" here to verify Ty is valid.
+    return LLVMTypes.at(Ty);
+  }
+
+  /// Converts LLVM type LLVMTy to an ICE type. Returns
+  /// Ice::IceType_NUM if unable to convert.
+  Type convertToIceType(llvm::Type *LLVMTy) const {
+    std::map<llvm::Type *, Type>::const_iterator
+        Pos = LLVM2IceMap.find(LLVMTy);
+    if (Pos == LLVM2IceMap.end())
+      return convertToIceTypeOther(LLVMTy);
+    return Pos->second;
+  }
+
+  /// Returns ICE model of pointer type.
+  Type getIcePointerType() const {
+    return IceType_i32;
+  }
+
+  /// Returns LLVM integer type with number of bits. Returns NULL
+  /// if not a valid PNaCl integer type.
+  llvm::Type *getLLVMIntegerType(unsigned NumBits) const;
+
+  /// Returns the LLVM vector type for Size and Ty arguments. Returns
+  /// NULL if not a valid PNaCl vector type.
+  llvm::Type *getLLVMVectorType(unsigned Size, Type Ty) const;
+
+private:
+  // The LLVM context to use to build LLVM types.
+  llvm::LLVMContext &Context;
+  // The list of allowable LLVM types. Indexed by ICE type.
+  std::vector<llvm::Type*> LLVMTypes;
+  // The inverse mapping of LLVMTypes.
+  std::map<llvm::Type *, Type> LLVM2IceMap;
+
+  // Add LLVM/ICE pair to internal tables.
+  void AddLLVMType(Type Ty, llvm::Type *LLVMTy);
+
+  // Converts types not in LLVM2IceMap.
+  Type convertToIceTypeOther(llvm::Type *LLVMTy) const;
+};
+
+} // end of Ice namespace.
+
+#endif // SUBZERO_SRC_ICETYPECONVERTER_H