Option parsing: support case-insensitive option matching.
Link.exe's command line options are case-insensitive. This patch
adds a new attribute to OptTable to let the option parser to compare
options, ignoring case.
Command lines are generally case-insensitive on Windows. CL.exe is an
exception. So this new attribute should be useful for other commands
running on Windows.
Differential Revision: http://llvm-reviews.chandlerc.com/D1485
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189416 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/OptParserEmitter.cpp b/utils/TableGen/OptParserEmitter.cpp
index 86328bf..f269436 100644
--- a/utils/TableGen/OptParserEmitter.cpp
+++ b/utils/TableGen/OptParserEmitter.cpp
@@ -13,27 +13,25 @@
#include "llvm/ADT/Twine.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/TableGenBackend.h"
+#include <cstring>
#include <map>
+#include <strings.h>
using namespace llvm;
+// Ordering on Info. The logic should match with the consumer-side function in
+// llvm/Option/OptTable.h.
static int StrCmpOptionName(const char *A, const char *B) {
- char a = *A, b = *B;
- while (a == b) {
- if (a == '\0')
- return 0;
-
- a = *++A;
- b = *++B;
+ size_t I = strlen(A);
+ size_t J = strlen(B);
+ if (I == J) {
+ if (int N = strcasecmp(A, B))
+ return N;
+ return strcmp(A, B);
}
-
- 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;
+ if (I < J)
+ return strncasecmp(A, B, I) < 0 ? -1 : 1;
+ return strncasecmp(A, B, J) <= 0 ? -1 : 1;
}
static int CompareOptionRecords(const void *Av, const void *Bv) {
@@ -50,7 +48,7 @@
if (!ASent)
if (int Cmp = StrCmpOptionName(A->getValueAsString("Name").c_str(),
B->getValueAsString("Name").c_str()))
- return Cmp;
+ return Cmp;
if (!ASent) {
std::vector<std::string> APrefixes = A->getValueAsListOfStrings("Prefixes");