Have ABI plugins vend llvm MCRegisterInfo data

Summary:
I was recently surprised to learn that there is a total of 2 (two) users
of the register info definitions contained in the ABI plugins. Yet, the
defitions themselves span nearly 10kLOC.
The two users are:
 - dwarf expression pretty printer
 - the mechanism for augmenting the register info definitions obtained
   over gdb-remote protocol (AugmentRegisterInfoViaABI)

Both of these uses need the DWARF an EH register numbers, which is
information that is already available in LLVM. This patch makes it
possible to do so.

It adds a GetMCRegisterInfo method to the ABI class, which every class
is expected to implement. Normally, it should be sufficient to obtain
the definitions from the appropriate llvm::Target object (for which I
provide a utility function), but the subclasses are free to construct it
in any way they deem fit.

We should be able to always get the MCRegisterInfo object from llvm,
with one important exception: if the relevant llvm target was disabled
at compile time. To handle this, I add a mechanism to disable the
compilation of ABI plugins based on the value of LLVM_TARGETS_TO_BUILD
cmake setting. This ensures all our existing are able to create their
MCRegisterInfo objects.

The new MCRegisterInfo api is not used yet, but the intention is to make
use of it in follow-up patches.

Reviewers: jasonmolenda, aprantl, JDevlieghere, tatyana-krasnukha

Subscribers: wuzish, nemanjai, mgorny, kbarton, atanasyan, lldb-commits

Differential Revision: https://reviews.llvm.org/D67965

llvm-svn: 372862

lldb/include/lldb/Target/ABI.h

@@ -15,8 +15,8 @@
 #include "lldb/lldb-private.h"
 
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/MC/MCRegisterInfo.h"
 
-// forward define the llvm::Type class
 namespace llvm {
 class Type;
 }
@@ -124,6 +124,8 @@ public:
     return pc;
   }
 
+  llvm::MCRegisterInfo &GetMCRegisterInfo() { return *m_mc_register_info_up; }
+
   virtual const RegisterInfo *GetRegisterInfoArray(uint32_t &count) = 0;
 
   bool GetRegisterInfoByName(ConstString name, RegisterInfo &info);
@@ -136,13 +138,19 @@ public:
   static lldb::ABISP FindPlugin(lldb::ProcessSP process_sp, const ArchSpec &arch);
 
 protected:
-  // Classes that inherit from ABI can see and modify these
-  ABI(lldb::ProcessSP process_sp) {
-    if (process_sp.get())
-        m_process_wp = process_sp;
+  ABI(lldb::ProcessSP process_sp, std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : m_process_wp(process_sp), m_mc_register_info_up(std::move(info_up)) {
+    assert(m_mc_register_info_up && "ABI must have MCRegisterInfo");
   }
 
+  /// Utility function to construct a MCRegisterInfo using the ArchSpec triple.
+  /// Plugins wishing to customize the construction can construct the
+  /// MCRegisterInfo themselves.
+  static std::unique_ptr<llvm::MCRegisterInfo>
+  MakeMCRegisterInfo(const ArchSpec &arch);
+
   lldb::ProcessWP m_process_wp;
+  std::unique_ptr<llvm::MCRegisterInfo> m_mc_register_info_up;
 
 private:
   DISALLOW_COPY_AND_ASSIGN(ABI);

lldb/source/API/CMakeLists.txt

@@ -103,6 +103,11 @@ add_lldb_library(liblldb SHARED
   ${option_install_prefix}
 )
 
+foreach (t ${LLVM_TARGETS_TO_BUILD})
+  set_property(SOURCE SystemInitializerFull.cpp APPEND PROPERTY
+    COMPILE_DEFINITIONS "LLVM_TARGET_${t}_BUILT")
+endforeach()
+
 if (MSVC)
   set_source_files_properties(SBReproducer.cpp PROPERTIES COMPILE_FLAGS /bigobj)
 endif()

lldb/source/API/SystemInitializerFull.cpp

@@ -174,20 +174,34 @@ llvm::Error SystemInitializerFull::Initialize() {
 
   ClangASTContext::Initialize();
 
-  ABIMacOSX_i386::Initialize();
-  ABIMacOSX_arm::Initialize();
+#ifdef LLVM_TARGET_AArch64_BUILT
   ABIMacOSX_arm64::Initialize();
-  ABISysV_arm::Initialize();
   ABISysV_arm64::Initialize();
+#endif
+#ifdef LLVM_TARGET_ARM_BUILT
+  ABIMacOSX_arm::Initialize();
+  ABISysV_arm::Initialize();
+#endif
+#ifdef LLVM_TARGET_Hexagon_BUILT
   ABISysV_hexagon::Initialize();
-  ABISysV_i386::Initialize();
-  ABISysV_x86_64::Initialize();
-  ABISysV_ppc::Initialize();
-  ABISysV_ppc64::Initialize();
+#endif
+#ifdef LLVM_TARGET_Mips_BUILT
   ABISysV_mips::Initialize();
   ABISysV_mips64::Initialize();
+#endif
+#ifdef LLVM_TARGET_PowerPC_BUILT
+  ABISysV_ppc::Initialize();
+  ABISysV_ppc64::Initialize();
+#endif
+#ifdef LLVM_TARGET_SystemZ_BUILT
   ABISysV_s390x::Initialize();
+#endif
+#ifdef LLVM_TARGET_X86_BUILT
+  ABIMacOSX_i386::Initialize();
+  ABISysV_i386::Initialize();
+  ABISysV_x86_64::Initialize();
   ABIWindows_x86_64::Initialize();
+#endif
 
   ArchitectureArm::Initialize();
   ArchitectureMips::Initialize();
@@ -288,20 +302,35 @@ void SystemInitializerFull::Terminate() {
   ArchitectureMips::Terminate();
   ArchitecturePPC64::Terminate();
 
-  ABIMacOSX_i386::Terminate();
-  ABIMacOSX_arm::Terminate();
+#ifdef LLVM_TARGET_AArch64_BUILT
   ABIMacOSX_arm64::Terminate();
-  ABISysV_arm::Terminate();
   ABISysV_arm64::Terminate();
+#endif
+#ifdef LLVM_TARGET_ARM_BUILT
+  ABIMacOSX_arm::Terminate();
+  ABISysV_arm::Terminate();
+#endif
+#ifdef LLVM_TARGET_Hexagon_BUILT
   ABISysV_hexagon::Terminate();
-  ABISysV_i386::Terminate();
-  ABISysV_x86_64::Terminate();
-  ABISysV_ppc::Terminate();
-  ABISysV_ppc64::Terminate();
+#endif
+#ifdef LLVM_TARGET_Mips_BUILT
   ABISysV_mips::Terminate();
   ABISysV_mips64::Terminate();
+#endif
+#ifdef LLVM_TARGET_PowerPC_BUILT
+  ABISysV_ppc::Terminate();
+  ABISysV_ppc64::Terminate();
+#endif
+#ifdef LLVM_TARGET_SystemZ_BUILT
   ABISysV_s390x::Terminate();
+#endif
+#ifdef LLVM_TARGET_X86_BUILT
+  ABIMacOSX_i386::Terminate();
+  ABISysV_i386::Terminate();
+  ABISysV_x86_64::Terminate();
   ABIWindows_x86_64::Terminate();
+#endif
+
   DisassemblerLLVMC::Terminate();
 
   JITLoaderGDB::Terminate();

lldb/source/Plugins/ABI/CMakeLists.txt

@@ -1,14 +1,28 @@
-add_subdirectory(SysV-arm)
-add_subdirectory(SysV-arm64)
-add_subdirectory(SysV-hexagon)
-add_subdirectory(SysV-ppc)
-add_subdirectory(SysV-ppc64)
-add_subdirectory(SysV-mips)
-add_subdirectory(SysV-mips64)
-add_subdirectory(SysV-s390x)
-add_subdirectory(SysV-i386)
-add_subdirectory(SysV-x86_64)
-add_subdirectory(MacOSX-i386)
-add_subdirectory(MacOSX-arm)
-add_subdirectory(MacOSX-arm64)
-add_subdirectory(Windows-x86_64)
+if ("AArch64" IN_LIST LLVM_TARGETS_TO_BUILD)
+  add_subdirectory(MacOSX-arm64)
+  add_subdirectory(SysV-arm64)
+endif()
+if ("ARM" IN_LIST LLVM_TARGETS_TO_BUILD)
+  add_subdirectory(MacOSX-arm)
+  add_subdirectory(SysV-arm)
+endif()
+if ("Hexagon" IN_LIST LLVM_TARGETS_TO_BUILD)
+  add_subdirectory(SysV-hexagon)
+endif()
+if ("Mips" IN_LIST LLVM_TARGETS_TO_BUILD)
+  add_subdirectory(SysV-mips)
+  add_subdirectory(SysV-mips64)
+endif()
+if ("PowerPC" IN_LIST LLVM_TARGETS_TO_BUILD)
+  add_subdirectory(SysV-ppc)
+  add_subdirectory(SysV-ppc64)
+endif()
+if ("SystemZ" IN_LIST LLVM_TARGETS_TO_BUILD)
+  add_subdirectory(SysV-s390x)
+endif()
+if ("X86" IN_LIST LLVM_TARGETS_TO_BUILD)
+  add_subdirectory(SysV-i386)
+  add_subdirectory(SysV-x86_64)
+  add_subdirectory(MacOSX-i386)
+  add_subdirectory(Windows-x86_64)
+endif()

lldb/source/Plugins/ABI/MacOSX-arm/ABIMacOSX_arm.cpp

@@ -1326,7 +1326,8 @@ ABIMacOSX_arm::CreateInstance(ProcessSP process_sp, const ArchSpec &arch) {
   if (vendor_type == llvm::Triple::Apple) {
     if ((arch_type == llvm::Triple::arm) ||
         (arch_type == llvm::Triple::thumb)) {
-      return ABISP(new ABIMacOSX_arm(process_sp));
+      return ABISP(
+          new ABIMacOSX_arm(std::move(process_sp), MakeMCRegisterInfo(arch)));
     }
   }
 

lldb/source/Plugins/ABI/MacOSX-arm/ABIMacOSX_arm.h

@@ -85,7 +85,9 @@ protected:
                            lldb_private::CompilerType &ast_type) const override;
 
 private:
-  ABIMacOSX_arm(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABIMacOSX_arm(lldb::ProcessSP process_sp,
+                std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/MacOSX-arm64/ABIMacOSX_arm64.cpp

@@ -1666,7 +1666,8 @@ ABIMacOSX_arm64::CreateInstance(ProcessSP process_sp, const ArchSpec &arch) {
 
   if (vendor_type == llvm::Triple::Apple) {
     if (arch_type == llvm::Triple::aarch64) {
-      return ABISP(new ABIMacOSX_arm64(process_sp));
+      return ABISP(
+          new ABIMacOSX_arm64(std::move(process_sp), MakeMCRegisterInfo(arch)));
     }
   }
 

lldb/source/Plugins/ABI/MacOSX-arm64/ABIMacOSX_arm64.h

@@ -93,7 +93,9 @@ protected:
                            lldb_private::CompilerType &ast_type) const override;
 
 private:
-  ABIMacOSX_arm64(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABIMacOSX_arm64(lldb::ProcessSP process_sp,
+                  std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/MacOSX-i386/ABIMacOSX_i386.cpp

@@ -710,7 +710,8 @@ ABIMacOSX_i386::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch)
   if ((arch.GetTriple().getArch() == llvm::Triple::x86) &&
       (arch.GetTriple().isMacOSX() || arch.GetTriple().isiOS() ||
        arch.GetTriple().isWatchOS())) {
-    return ABISP(new ABIMacOSX_i386(process_sp));
+    return ABISP(
+        new ABIMacOSX_i386(std::move(process_sp), MakeMCRegisterInfo(arch)));
   }
   return ABISP();
 }

lldb/source/Plugins/ABI/MacOSX-i386/ABIMacOSX_i386.h

@@ -92,7 +92,9 @@ protected:
   bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
 
 private:
-  ABIMacOSX_i386(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABIMacOSX_i386(lldb::ProcessSP process_sp,
+                 std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/SysV-arm/ABISysV_arm.cpp

@@ -1327,7 +1327,8 @@ ABISysV_arm::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) {
   if (vendor_type != llvm::Triple::Apple) {
     if ((arch_type == llvm::Triple::arm) ||
         (arch_type == llvm::Triple::thumb)) {
-      return ABISP(new ABISysV_arm(process_sp));
+      return ABISP(
+          new ABISysV_arm(std::move(process_sp), MakeMCRegisterInfo(arch)));
     }
   }
 

lldb/source/Plugins/ABI/SysV-arm/ABISysV_arm.h

@@ -85,7 +85,9 @@ protected:
                            lldb_private::CompilerType &ast_type) const override;
 
 private:
-  ABISysV_arm(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABISysV_arm(lldb::ProcessSP process_sp,
+              std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/SysV-arm64/ABISysV_arm64.cpp

@@ -1669,7 +1669,8 @@ ABISysV_arm64::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch)
 
   if (vendor_type != llvm::Triple::Apple) {
     if (arch_type == llvm::Triple::aarch64) {
-      return ABISP(new ABISysV_arm64(process_sp));
+      return ABISP(
+          new ABISysV_arm64(std::move(process_sp), MakeMCRegisterInfo(arch)));
     }
   }
 

lldb/source/Plugins/ABI/SysV-arm64/ABISysV_arm64.h

@@ -92,7 +92,9 @@ protected:
                            lldb_private::CompilerType &ast_type) const override;
 
 private:
-  ABISysV_arm64(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABISysV_arm64(lldb::ProcessSP process_sp,
+                std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/SysV-hexagon/ABISysV_hexagon.cpp

@@ -1014,7 +1014,8 @@ size_t ABISysV_hexagon::GetRedZoneSize() const { return 0; }
 ABISP
 ABISysV_hexagon::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) {
   if (arch.GetTriple().getArch() == llvm::Triple::hexagon) {
-    return ABISP(new ABISysV_hexagon(process_sp));
+    return ABISP(
+        new ABISysV_hexagon(std::move(process_sp), MakeMCRegisterInfo(arch)));
   }
   return ABISP();
 }

lldb/source/Plugins/ABI/SysV-hexagon/ABISysV_hexagon.h

@@ -97,7 +97,9 @@ protected:
   bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
 
 private:
-  ABISysV_hexagon(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABISysV_hexagon(lldb::ProcessSP process_sp,
+                  std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/SysV-i386/ABISysV_i386.cpp

@@ -198,7 +198,8 @@ ABISP
 ABISysV_i386::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) {
   if (arch.GetTriple().getVendor() != llvm::Triple::Apple) {
     if (arch.GetTriple().getArch() == llvm::Triple::x86) {
-      return ABISP(new ABISysV_i386(process_sp));
+      return ABISP(
+          new ABISysV_i386(std::move(process_sp), MakeMCRegisterInfo(arch)));
     }
   }
   return ABISP();

lldb/source/Plugins/ABI/SysV-i386/ABISysV_i386.h

@@ -100,7 +100,9 @@ protected:
   bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
 
 private:
-  ABISysV_i386(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABISysV_i386(lldb::ProcessSP process_sp,
+               std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/SysV-mips/ABISysV_mips.cpp

@@ -556,7 +556,8 @@ ABISysV_mips::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) {
   const llvm::Triple::ArchType arch_type = arch.GetTriple().getArch();
   if ((arch_type == llvm::Triple::mips) ||
       (arch_type == llvm::Triple::mipsel)) {
-    return ABISP(new ABISysV_mips(process_sp));
+    return ABISP(
+        new ABISysV_mips(std::move(process_sp), MakeMCRegisterInfo(arch)));
   }
   return ABISP();
 }

lldb/source/Plugins/ABI/SysV-mips/ABISysV_mips.h

@@ -87,7 +87,9 @@ protected:
   bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
 
 private:
-  ABISysV_mips(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABISysV_mips(lldb::ProcessSP process_sp,
+               std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/SysV-mips64/ABISysV_mips64.cpp

@@ -554,7 +554,8 @@ size_t ABISysV_mips64::GetRedZoneSize() const { return 0; }
 ABISP
 ABISysV_mips64::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) {
   if (arch.GetTriple().isMIPS64())
-    return ABISP(new ABISysV_mips64(process_sp));
+    return ABISP(
+        new ABISysV_mips64(std::move(process_sp), MakeMCRegisterInfo(arch)));
   return ABISP();
 }
 

lldb/source/Plugins/ABI/SysV-mips64/ABISysV_mips64.h

@@ -100,7 +100,9 @@ protected:
   bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
 
 private:
-  ABISysV_mips64(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABISysV_mips64(lldb::ProcessSP process_sp,
+                 std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/SysV-ppc/ABISysV_ppc.cpp

@@ -218,7 +218,8 @@ size_t ABISysV_ppc::GetRedZoneSize() const { return 224; }
 ABISP
 ABISysV_ppc::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) {
   if (arch.GetTriple().getArch() == llvm::Triple::ppc) {
-     return ABISP(new ABISysV_ppc(process_sp));
+    return ABISP(
+        new ABISysV_ppc(std::move(process_sp), MakeMCRegisterInfo(arch)));
   }
   return ABISP();
 }

lldb/source/Plugins/ABI/SysV-ppc/ABISysV_ppc.h

@@ -96,7 +96,9 @@ protected:
   bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
 
 private:
-  ABISysV_ppc(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABISysV_ppc(lldb::ProcessSP process_sp,
+              std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/SysV-ppc64/ABISysV_ppc64.cpp

@@ -70,7 +70,8 @@ ABISP
 ABISysV_ppc64::CreateInstance(lldb::ProcessSP process_sp,
                               const ArchSpec &arch) {
   if (arch.GetTriple().isPPC64())
-    return ABISP(new ABISysV_ppc64(process_sp));
+    return ABISP(
+        new ABISysV_ppc64(std::move(process_sp), MakeMCRegisterInfo(arch)));
   return ABISP();
 }
 

lldb/source/Plugins/ABI/SysV-ppc64/ABISysV_ppc64.h

@@ -96,7 +96,9 @@ protected:
   bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
 
 private:
-  ABISysV_ppc64(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABISysV_ppc64(lldb::ProcessSP process_sp,
+                std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 

lldb/source/Plugins/ABI/SysV-s390x/ABISysV_s390x.cpp

@@ -200,7 +200,7 @@ size_t ABISysV_s390x::GetRedZoneSize() const { return 0; }
 ABISP
 ABISysV_s390x::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) {
   if (arch.GetTriple().getArch() == llvm::Triple::systemz) {
-    return ABISP(new ABISysV_s390x(process_sp));
+    return ABISP(new ABISysV_s390x(std::move(process_sp), MakeMCRegisterInfo(arch)));
   }
   return ABISP();
 }

lldb/source/Plugins/ABI/SysV-s390x/ABISysV_s390x.h

@@ -88,7 +88,9 @@ protected:
   bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
 
 private:
-  ABISysV_s390x(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABISysV_s390x(lldb::ProcessSP process_sp,
+                std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/SysV-x86_64/ABISysV_x86_64.cpp

@@ -235,7 +235,8 @@ ABISysV_x86_64::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch)
       case llvm::Triple::EnvironmentType::UnknownEnvironment:
         // UnknownEnvironment is needed for older compilers that don't
         // support the simulator environment.
-        return ABISP(new ABISysV_x86_64(process_sp));
+        return ABISP(new ABISysV_x86_64(std::move(process_sp),
+                                        MakeMCRegisterInfo(arch)));
       default:
         return ABISP();
       }
@@ -246,7 +247,8 @@ ABISysV_x86_64::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch)
     case llvm::Triple::OSType::NetBSD:
     case llvm::Triple::OSType::Solaris:
     case llvm::Triple::OSType::UnknownOS:
-      return ABISP(new ABISysV_x86_64(process_sp));
+      return ABISP(
+          new ABISysV_x86_64(std::move(process_sp), MakeMCRegisterInfo(arch)));
     default:
       return ABISP();
     }

lldb/source/Plugins/ABI/SysV-x86_64/ABISysV_x86_64.h

@@ -98,7 +98,9 @@ protected:
   bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
 
 private:
-  ABISysV_x86_64(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABISysV_x86_64(lldb::ProcessSP process_sp,
+                 std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Plugins/ABI/Windows-x86_64/ABIWindows_x86_64.cpp

@@ -1092,7 +1092,8 @@ ABISP
 ABIWindows_x86_64::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) {
   if (arch.GetTriple().getArch() == llvm::Triple::x86_64 &&
       arch.GetTriple().isOSWindows()) {
-    return ABISP(new ABIWindows_x86_64(process_sp));
+    return ABISP(
+        new ABIWindows_x86_64(std::move(process_sp), MakeMCRegisterInfo(arch)));
   }
   return ABISP();
 }

lldb/source/Plugins/ABI/Windows-x86_64/ABIWindows_x86_64.h

@@ -91,7 +91,9 @@ protected:
   bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
 
 private:
-  ABIWindows_x86_64(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
+  ABIWindows_x86_64(lldb::ProcessSP process_sp,
+                    std::unique_ptr<llvm::MCRegisterInfo> info_up)
+      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
     // Call CreateInstance instead.
   }
 };

lldb/source/Target/ABI.cpp

@@ -15,6 +15,8 @@
 #include "lldb/Symbol/TypeSystem.h"
 #include "lldb/Target/Target.h"
 #include "lldb/Target/Thread.h"
+#include "lldb/Utility/Log.h"
+#include "llvm/Support/TargetRegistry.h"
 
 using namespace lldb;
 using namespace lldb_private;
@@ -210,3 +212,20 @@ bool ABI::GetFallbackRegisterLocation(
 
   return false;
 }
+
+std::unique_ptr<llvm::MCRegisterInfo> ABI::MakeMCRegisterInfo(const ArchSpec &arch) {
+  std::string triple = arch.GetTriple().getTriple();
+  std::string lookup_error;
+  const llvm::Target *target =
+      llvm::TargetRegistry::lookupTarget(triple, lookup_error);
+  if (!target) {
+    LLDB_LOG(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS),
+             "Failed to create an llvm target for {0}: {1}", triple,
+             lookup_error);
+    return nullptr;
+  }
+  std::unique_ptr<llvm::MCRegisterInfo> info_up(
+      target->createMCRegInfo(triple));
+  assert(info_up);
+  return info_up;
+}

lldb/tools/lldb-test/CMakeLists.txt

@@ -24,4 +24,9 @@ add_lldb_tool(lldb-test
     Support
   )
   
+foreach (t ${LLVM_TARGETS_TO_BUILD})
+  set_property(SOURCE SystemInitializerTest.cpp APPEND PROPERTY
+    COMPILE_DEFINITIONS "LLVM_TARGET_${t}_BUILT")
+endforeach()
+
 include_directories(${LLDB_SOURCE_DIR}/source)

lldb/tools/lldb-test/SystemInitializerTest.cpp

@@ -28,6 +28,7 @@
 #include "Plugins/ABI/SysV-ppc64/ABISysV_ppc64.h"
 #include "Plugins/ABI/SysV-s390x/ABISysV_s390x.h"
 #include "Plugins/ABI/SysV-x86_64/ABISysV_x86_64.h"
+#include "Plugins/ABI/Windows-x86_64/ABIWindows_x86_64.h"
 #include "Plugins/Architecture/Arm/ArchitectureArm.h"
 #include "Plugins/Architecture/PPC64/ArchitecturePPC64.h"
 #include "Plugins/Disassembler/llvm/DisassemblerLLVMC.h"
@@ -144,19 +145,34 @@ llvm::Error SystemInitializerTest::Initialize() {
 
   ClangASTContext::Initialize();
 
-  ABIMacOSX_i386::Initialize();
-  ABIMacOSX_arm::Initialize();
+#ifdef LLVM_TARGET_AArch64_BUILT
   ABIMacOSX_arm64::Initialize();
-  ABISysV_arm::Initialize();
   ABISysV_arm64::Initialize();
+#endif
+#ifdef LLVM_TARGET_ARM_BUILT
+  ABIMacOSX_arm::Initialize();
+  ABISysV_arm::Initialize();
+#endif
+#ifdef LLVM_TARGET_Hexagon_BUILT
   ABISysV_hexagon::Initialize();
-  ABISysV_i386::Initialize();
-  ABISysV_x86_64::Initialize();
-  ABISysV_ppc::Initialize();
-  ABISysV_ppc64::Initialize();
+#endif
+#ifdef LLVM_TARGET_Mips_BUILT
   ABISysV_mips::Initialize();
   ABISysV_mips64::Initialize();
+#endif
+#ifdef LLVM_TARGET_PowerPC_BUILT
+  ABISysV_ppc::Initialize();
+  ABISysV_ppc64::Initialize();
+#endif
+#ifdef LLVM_TARGET_SystemZ_BUILT
   ABISysV_s390x::Initialize();
+#endif
+#ifdef LLVM_TARGET_X86_BUILT
+  ABIMacOSX_i386::Initialize();
+  ABISysV_i386::Initialize();
+  ABISysV_x86_64::Initialize();
+  ABIWindows_x86_64::Initialize();
+#endif
 
   ArchitectureArm::Initialize();
   ArchitecturePPC64::Initialize();
@@ -246,19 +262,35 @@ void SystemInitializerTest::Terminate() {
 
   ClangASTContext::Terminate();
 
-  ABIMacOSX_i386::Terminate();
-  ABIMacOSX_arm::Terminate();
+#ifdef LLVM_TARGET_AArch64_BUILT
   ABIMacOSX_arm64::Terminate();
-  ABISysV_arm::Terminate();
   ABISysV_arm64::Terminate();
+#endif
+#ifdef LLVM_TARGET_ARM_BUILT
+  ABIMacOSX_arm::Terminate();
+  ABISysV_arm::Terminate();
+#endif
+#ifdef LLVM_TARGET_Hexagon_BUILT
   ABISysV_hexagon::Terminate();
-  ABISysV_i386::Terminate();
-  ABISysV_x86_64::Terminate();
-  ABISysV_ppc::Terminate();
-  ABISysV_ppc64::Terminate();
+#endif
+#ifdef LLVM_TARGET_Mips_BUILT
   ABISysV_mips::Terminate();
   ABISysV_mips64::Terminate();
+#endif
+#ifdef LLVM_TARGET_PowerPC_BUILT
+  ABISysV_ppc::Terminate();
+  ABISysV_ppc64::Terminate();
+#endif
+#ifdef LLVM_TARGET_SystemZ_BUILT
   ABISysV_s390x::Terminate();
+#endif
+#ifdef LLVM_TARGET_X86_BUILT
+  ABIMacOSX_i386::Terminate();
+  ABISysV_i386::Terminate();
+  ABISysV_x86_64::Terminate();
+  ABIWindows_x86_64::Terminate();
+#endif
+
   DisassemblerLLVMC::Terminate();
 
   JITLoaderGDB::Terminate();