[llvm-exegesis] A mechanism to add target-specific functionality.

Summary: This is a step towards implementing memory operands and X87.

Reviewers: gchatelet

Subscribers: mgorny, tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D48210

llvm-svn: 335038

1 files changed, 36 insertions, 0 deletions

diff --git a/llvm/tools/llvm-exegesis/lib/Target.cpp b/llvm/tools/llvm-exegesis/lib/Target.cpp
new file mode 100644
index 00000000000..1b11f93e353
--- /dev/null
+++ b/llvm/tools/llvm-exegesis/lib/Target.cpp
@@ -0,0 +1,36 @@
+//===-- Target.cpp ----------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#include "Target.h"
+
+namespace exegesis {
+
+ExegesisTarget::~ExegesisTarget() {}  // anchor.
+
+static ExegesisTarget* FirstTarget = nullptr;
+
+const ExegesisTarget* ExegesisTarget::lookup(llvm::StringRef TT) {
+  const llvm::Triple::ArchType Arch = llvm::Triple(TT).getArch();
+  for (const ExegesisTarget* T = FirstTarget; T != nullptr; T = T->Next) {
+    if (T->matchesArch(Arch)) return T;
+  }
+  return nullptr;
+}
+
+void ExegesisTarget::registerTarget(ExegesisTarget *Target){
+  if (FirstTarget == nullptr) {
+    FirstTarget = Target;
+    return;
+  }
+  assert(Target->Next == nullptr && "target has already been registered");
+  if (Target->Next != nullptr)
+    return;
+  Target->Next = FirstTarget;
+  FirstTarget = Target;
+}
+}  // namespace exegesis