[AAP] (3) Add AAP backend stub

[edward-jones]

Summary

Introduce the barebones for the AAP backend. This builds on D23665.

[rengolin]

AFAICR, people submit the code that can perform at least some simple tasks, not just the mock. So maybe this could already have parts of the codegen that you guys have.

[edward-jones]

The next 4 patches that I have add InstrInfo, RegisterInfo tablegen, and AsmParser and MC layer support. If I merged those changes into this one patch, then the backend would be able to run basic MC level tests. Alternatively I can submit those patches separately, as when combined they contain quite a lot of code.

[rengolin]

Right, in this case, seems trivial enough. Thanks!

[asb]

lib/Target/AAP/TargetInfo/AAPTargetInfo.cpp

17

In rL283702, all the in-tree backends changed to put TheFooTarget behind a getter. This patch should do the same.

[edward-jones]

Updated the patch to move TheAAPTarget behind a getter

[joerg]

Just being a bit pedantic here.

lib/Target/AAP/CMakeLists.txt

6

Extra spaces.

lib/Target/AAP/LLVMBuild.txt

2

Missing - for line length.

lib/Target/AAP/TargetInfo/AAPTargetInfo.cpp

28

Missing period.

lib/Target/AAP/TargetInfo/CMakeLists.txt

4

Extra space.

[joerg]

This change should update the top-level CMakeLists.txt as well to extend LLVM_ALL_TARGETS, otherwise I don't think this is fully self-contained.

[edward-jones]

In D23667#612942, @joerg wrote:

This change should update the top-level CMakeLists.txt as well to extend LLVM_ALL_TARGETS, otherwise I don't think this is fully self-contained.

The target is enabled through the CMake variable EXPERIMENTAL_TARGETS_TO_BUILD, so I haven't added AAP to LLVM_ALL_TARGETS

[edward-jones]

Rolled forward to top of tree and incorporated Joerg's suggestions.

[edward-jones]

Updated to reflect latest changes to LLVM

lib/Target/AAP/AAPTargetMachine.cpp

+//===-- AAPTargetMachine.cpp - Define TargetMachine for AAP ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements the info about AAP target spec.
+//
+//===----------------------------------------------------------------------===//
+
+extern "C" void LLVMInitializeAAPTarget() {
+}
+

lib/Target/AAP/CMakeLists.txt

+set(LLVM_TARGET_DEFINITIONS AAP.td)
+
+add_llvm_target(AAPCodeGen
+  AAPTargetMachine.cpp
+)
+
+add_subdirectory(TargetInfo)

lib/Target/AAP/LLVMBuild.txt

+;===- ./lib/Target/AAP/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
+;
+;===------------------------------------------------------------------------===;
+
+[common]
+subdirectories = TargetInfo
+
+[component_0]
+type = TargetGroup
+name = AAP
+parent = Target
+has_asmprinter = 0
+has_asmparser = 0
+
+[component_1]
+type = Library
+name = AAPCodeGen
+parent = AAP
+required_libraries = AsmPrinter CodeGen Core MC SelectionDAG Support Target AAPInfo
+add_to_library_groups = AAP

lib/Target/AAP/TargetInfo/AAPTargetInfo.cpp

+//===-- AAPTargetInfo.cpp - AAP Target Implementation ---------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/Module.h"
+#include "llvm/Support/TargetRegistry.h"
+
+using namespace llvm;
+
+namespace llvm {
+Target &getTheAAPTarget() {
+  static Target TheAAPTarget;
+  return TheAAPTarget;
+}
+}
+
+extern "C" void LLVMInitializeAAPTargetInfo() {
+  RegisterTarget<Triple::aap> X(getTheAAPTarget(), "aap", "AAP [experimental]");
+}
+
+// Placeholder. This will be removed when the MC support has been
+// introduced
+extern "C" void LLVMInitializeAAPTargetMC() {
+}

lib/Target/AAP/TargetInfo/CMakeLists.txt

+add_llvm_library(LLVMAAPInfo
+  AAPTargetInfo.cpp
+)

lib/Target/AAP/TargetInfo/LLVMBuild.txt

+;===- ./lib/Target/AAP/TargetInfo/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 = AAPInfo
+parent = AAP
+required_libraries = Support
+add_to_library_groups = AAP

lib/Target/LLVMBuild.txt

 ;   http://llvm.org/docs/LLVMBuild.html
 ;
 ;===------------------------------------------------------------------------===;
 
 ; Please keep these as one per line so that out-of-tree merges
 ; will typically require only insertion of a line.
 [common]
 subdirectories =
+ AAP
  AMDGPU
  ARM
  AArch64
  AVR
  BPF
  Lanai
  Hexagon
  MSP430