vendor/llvm-project/llvmorg-10-init-17466-ge26a78e7085

1 files changed, 84 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/OptEmitter.cpp b/llvm/utils/TableGen/OptEmitter.cpp
new file mode 100644
index 0000000000000..7fcf3074e0931
--- /dev/null
+++ b/llvm/utils/TableGen/OptEmitter.cpp
@@ -0,0 +1,84 @@
+//===- OptEmitter.cpp - Helper for emitting options.----------- -----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "OptEmitter.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/TableGen/Error.h"
+#include "llvm/TableGen/Record.h"
+#include <cctype>
+#include <cstring>
+
+namespace llvm {
+
+// Ordering on Info. The logic should match with the consumer-side function in
+// llvm/Option/OptTable.h.
+// FIXME: Make this take StringRefs instead of null terminated strings to
+// simplify callers.
+static int StrCmpOptionName(const char *A, const char *B) {
+  const char *X = A, *Y = B;
+  char a = tolower(*A), b = tolower(*B);
+  while (a == b) {
+    if (a == '\0')
+      return strcmp(A, B);
+
+    a = tolower(*++X);
+    b = tolower(*++Y);
+  }
+
+  if (a == '\0') // A is a prefix of B.
+    return 1;
+  if (b == '\0') // B is a prefix of A.
+    return -1;
+
+  // Otherwise lexicographic.
+  return (a < b) ? -1 : 1;
+}
+
+int CompareOptionRecords(Record *const *Av, Record *const *Bv) {
+  const Record *A = *Av;
+  const Record *B = *Bv;
+
+  // Sentinel options precede all others and are only ordered by precedence.
+  bool ASent = A->getValueAsDef("Kind")->getValueAsBit("Sentinel");
+  bool BSent = B->getValueAsDef("Kind")->getValueAsBit("Sentinel");
+  if (ASent != BSent)
+    return ASent ? -1 : 1;
+
+  // Compare options by name, unless they are sentinels.
+  if (!ASent)
+    if (int Cmp = StrCmpOptionName(A->getValueAsString("Name").str().c_str(),
+                                   B->getValueAsString("Name").str().c_str()))
+      return Cmp;
+
+  if (!ASent) {
+    std::vector<StringRef> APrefixes = A->getValueAsListOfStrings("Prefixes");
+    std::vector<StringRef> BPrefixes = B->getValueAsListOfStrings("Prefixes");
+
+    for (std::vector<StringRef>::const_iterator APre = APrefixes.begin(),
+                                                AEPre = APrefixes.end(),
+                                                BPre = BPrefixes.begin(),
+                                                BEPre = BPrefixes.end();
+         APre != AEPre && BPre != BEPre; ++APre, ++BPre) {
+      if (int Cmp = StrCmpOptionName(APre->str().c_str(), BPre->str().c_str()))
+        return Cmp;
+    }
+  }
+
+  // Then by the kind precedence;
+  int APrec = A->getValueAsDef("Kind")->getValueAsInt("Precedence");
+  int BPrec = B->getValueAsDef("Kind")->getValueAsInt("Precedence");
+  if (APrec == BPrec && A->getValueAsListOfStrings("Prefixes") ==
+                            B->getValueAsListOfStrings("Prefixes")) {
+    PrintError(A->getLoc(), Twine("Option is equivalent to"));
+    PrintError(B->getLoc(), Twine("Other defined here"));
+    PrintFatalError("Equivalent Options found.");
+  }
+  return APrec < BPrec ? -1 : 1;
+}
+
+} // namespace llvm