Add XCore disassembler.

Currently there is no instruction encoding info and
XCoreDisassembler::getInstruction() always returns Fail. I intend to add
instruction encodings and tests in follow on commits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170292 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 109 insertions, 0 deletions

diff --git a/lib/Target/XCore/Disassembler/CMakeLists.txt b/lib/Target/XCore/Disassembler/CMakeLists.txt
new file mode 100644
index 0000000..cdc5d99
--- /dev/null
+++ b/lib/Target/XCore/Disassembler/CMakeLists.txt
@@ -0,0 +1,5 @@
+add_llvm_library(LLVMXCoreDisassembler
+  XCoreDisassembler.cpp
+  )
+
+add_dependencies(LLVMXCoreDisassembler XCoreCommonTableGen)
diff --git a/lib/Target/XCore/Disassembler/LLVMBuild.txt b/lib/Target/XCore/Disassembler/LLVMBuild.txt
new file mode 100644
index 0000000..028de2c
--- /dev/null
+++ b/lib/Target/XCore/Disassembler/LLVMBuild.txt
@@ -0,0 +1,23 @@
+;===- ./lib/Target/XCore/Disassembler/LLVMBuild.txt ------------*- Conf -*--===;
+;
+;                     The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = XCoreDisassembler
+parent = XCore
+required_libraries = MC Support XCoreInfo
+add_to_library_groups = XCore
diff --git a/lib/Target/XCore/Disassembler/Makefile b/lib/Target/XCore/Disassembler/Makefile
new file mode 100644
index 0000000..2b28d39
--- /dev/null
+++ b/lib/Target/XCore/Disassembler/Makefile
@@ -0,0 +1,13 @@
+##===- lib/Target/XCore/Disassembler/Makefile --------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../../../..
+LIBRARYNAME = LLVMXCoreDisassembler
+
+include $(LEVEL)/Makefile.common
diff --git a/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp b/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp
new file mode 100644
index 0000000..16b3c20
--- /dev/null
+++ b/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp
@@ -0,0 +1,68 @@
+//===- XCoreDisassembler.cpp - Disassembler for XCore -----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is part of the XCore Disassembler.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCDisassembler.h"
+#include "llvm/MC/MCFixedLenDisassembler.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/MemoryObject.h"
+#include "llvm/Support/TargetRegistry.h"
+
+using namespace llvm;
+
+typedef MCDisassembler::DecodeStatus DecodeStatus;
+
+namespace {
+
+/// XCoreDisassembler - a disasembler class for XCore.
+class XCoreDisassembler : public MCDisassembler {
+public:
+  /// Constructor     - Initializes the disassembler.
+  ///
+  XCoreDisassembler(const MCSubtargetInfo &STI) :
+    MCDisassembler(STI) {}
+
+  /// getInstruction - See MCDisassembler.
+  virtual DecodeStatus getInstruction(MCInst &instr,
+                                      uint64_t &size,
+                                      const MemoryObject &region,
+                                      uint64_t address,
+                                      raw_ostream &vStream,
+                                      raw_ostream &cStream) const;
+};
+
+}
+
+MCDisassembler::DecodeStatus
+XCoreDisassembler::getInstruction(MCInst &instr,
+                                  uint64_t &Size,
+                                  const MemoryObject &Region,
+                                  uint64_t Address,
+                                  raw_ostream &vStream,
+                                  raw_ostream &cStream) const {
+  return Fail;
+}
+
+namespace llvm {
+  extern Target TheXCoreTarget;
+}
+
+static MCDisassembler *createXCoreDisassembler(const Target &T,
+                                               const MCSubtargetInfo &STI) {
+  return new XCoreDisassembler(STI);
+}
+
+extern "C" void LLVMInitializeXCoreDisassembler() {
+  // Register the disassembler.
+  TargetRegistry::RegisterMCDisassembler(TheXCoreTarget,
+                                         createXCoreDisassembler);
+}