[Clang] Restore replace_path_prefix instead of startswith

In D49466, sys::path::replace_path_prefix was used instead startswith for -f[macro/debug/file]-prefix-map options.
However those were reverted later (commit rG3bb24bf25767ef5bbcef958b484e7a06d8689204) due to broken Windows tests.

This patch restores those replace_path_prefix calls.
It also modifies the prefix matching to be case-insensitive under Windows.

Differential Revision : https://reviews.llvm.org/D76869

1 files changed, 37 insertions, 12 deletions

diff --git a/llvm/unittests/Support/Path.cpp b/llvm/unittests/Support/Path.cpp
index a577f1b..8e842a9 100644
--- a/llvm/unittests/Support/Path.cpp
+++ b/llvm/unittests/Support/Path.cpp
@@ -1311,48 +1311,73 @@ TEST(Support, ReplacePathPrefix) {
   SmallString<64> Path1("/foo");
   SmallString<64> Path2("/old/foo");
   SmallString<64> Path3("/oldnew/foo");
+  SmallString<64> Path4("C:\\old/foo\\bar");
   SmallString<64> OldPrefix("/old");
   SmallString<64> OldPrefixSep("/old/");
+  SmallString<64> OldPrefixWin("c:/oLD/F");
   SmallString<64> NewPrefix("/new");
   SmallString<64> NewPrefix2("/longernew");
   SmallString<64> EmptyPrefix("");
+  bool Found;
 
   SmallString<64> Path = Path1;
-  path::replace_path_prefix(Path, OldPrefix, NewPrefix);
+  Found = path::replace_path_prefix(Path, OldPrefix, NewPrefix);
+  EXPECT_FALSE(Found);
   EXPECT_EQ(Path, "/foo");
   Path = Path2;
-  path::replace_path_prefix(Path, OldPrefix, NewPrefix);
+  Found = path::replace_path_prefix(Path, OldPrefix, NewPrefix);
+  EXPECT_TRUE(Found);
   EXPECT_EQ(Path, "/new/foo");
   Path = Path2;
-  path::replace_path_prefix(Path, OldPrefix, NewPrefix2);
+  Found = path::replace_path_prefix(Path, OldPrefix, NewPrefix2);
+  EXPECT_TRUE(Found);
   EXPECT_EQ(Path, "/longernew/foo");
   Path = Path1;
-  path::replace_path_prefix(Path, EmptyPrefix, NewPrefix);
+  Found = path::replace_path_prefix(Path, EmptyPrefix, NewPrefix);
+  EXPECT_TRUE(Found);
   EXPECT_EQ(Path, "/new/foo");
   Path = Path2;
-  path::replace_path_prefix(Path, OldPrefix, EmptyPrefix);
+  Found = path::replace_path_prefix(Path, OldPrefix, EmptyPrefix);
+  EXPECT_TRUE(Found);
   EXPECT_EQ(Path, "/foo");
   Path = Path2;
-  path::replace_path_prefix(Path, OldPrefixSep, EmptyPrefix);
+  Found = path::replace_path_prefix(Path, OldPrefixSep, EmptyPrefix);
+  EXPECT_TRUE(Found);
   EXPECT_EQ(Path, "foo");
   Path = Path3;
-  path::replace_path_prefix(Path, OldPrefix, NewPrefix);
+  Found = path::replace_path_prefix(Path, OldPrefix, NewPrefix);
+  EXPECT_TRUE(Found);
   EXPECT_EQ(Path, "/newnew/foo");
   Path = Path3;
-  path::replace_path_prefix(Path, OldPrefix, NewPrefix2);
+  Found = path::replace_path_prefix(Path, OldPrefix, NewPrefix2);
+  EXPECT_TRUE(Found);
   EXPECT_EQ(Path, "/longernewnew/foo");
   Path = Path1;
-  path::replace_path_prefix(Path, EmptyPrefix, NewPrefix);
+  Found = path::replace_path_prefix(Path, EmptyPrefix, NewPrefix);
+  EXPECT_TRUE(Found);
   EXPECT_EQ(Path, "/new/foo");
   Path = OldPrefix;
-  path::replace_path_prefix(Path, OldPrefix, NewPrefix);
+  Found = path::replace_path_prefix(Path, OldPrefix, NewPrefix);
+  EXPECT_TRUE(Found);
   EXPECT_EQ(Path, "/new");
   Path = OldPrefixSep;
-  path::replace_path_prefix(Path, OldPrefix, NewPrefix);
+  Found = path::replace_path_prefix(Path, OldPrefix, NewPrefix);
+  EXPECT_TRUE(Found);
   EXPECT_EQ(Path, "/new/");
   Path = OldPrefix;
-  path::replace_path_prefix(Path, OldPrefixSep, NewPrefix);
+  Found = path::replace_path_prefix(Path, OldPrefixSep, NewPrefix);
+  EXPECT_FALSE(Found);
   EXPECT_EQ(Path, "/old");
+  Path = Path4;
+  Found = path::replace_path_prefix(Path, OldPrefixWin, NewPrefix,
+                                    path::Style::windows);
+  EXPECT_TRUE(Found);
+  EXPECT_EQ(Path, "/newoo\\bar");
+  Path = Path4;
+  Found = path::replace_path_prefix(Path, OldPrefixWin, NewPrefix,
+                                    path::Style::posix);
+  EXPECT_FALSE(Found);
+  EXPECT_EQ(Path, "C:\\old/foo\\bar");
 }
 
 TEST_F(FileSystemTest, OpenFileForRead) {