[clang] Introduce diagnostics suppression mappings (#112517)

This implements

https://discourse.llvm.org/t/rfc-add-support-for-controlling-diagnostics-severities-at-file-level-granularity-through-command-line/81292.

Users now can suppress warnings for certain headers by providing a
mapping with globs, a sample file looks like:
```
[unused]
src:*
src:*clang/*=emit
```

This will suppress warnings from `-Wunused` group in all files that
aren't under `clang/` directory. This mapping file can be passed to
clang via `--warning-suppression-mappings=foo.txt`.

At a high level, mapping file is stored in DiagnosticOptions and then
processed with rest of the warning flags when creating a
DiagnosticsEngine. This is a functor that uses SpecialCaseLists
underneath to match against globs coming from the mappings file.

This implies processing warning options now performs IO, relevant
interfaces are updated to take in a VFS, falling back to RealFileSystem
when one is not available.

1 files changed, 11 insertions, 6 deletions

diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index f58e27a..8df5465 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -1367,7 +1367,7 @@ ASTUnit::getMainBufferWithPrecompiledPreamble(
       // after parsing the preamble.
       getDiagnostics().Reset();
       ProcessWarningOptions(getDiagnostics(),
-                            PreambleInvocationIn.getDiagnosticOpts());
+                            PreambleInvocationIn.getDiagnosticOpts(), *VFS);
       getDiagnostics().setNumWarnings(NumWarningsInPreamble);
 
       PreambleRebuildCountdown = 1;
@@ -1593,7 +1593,8 @@ ASTUnit *ASTUnit::LoadFromCompilerInvocationAction(
   // We'll manage file buffers ourselves.
   CI->getPreprocessorOpts().RetainRemappedFileBuffers = true;
   CI->getFrontendOpts().DisableFree = false;
-  ProcessWarningOptions(AST->getDiagnostics(), CI->getDiagnosticOpts());
+  ProcessWarningOptions(AST->getDiagnostics(), CI->getDiagnosticOpts(),
+                        AST->getFileManager().getVirtualFileSystem());
 
   // Create the compiler instance to use for building the AST.
   std::unique_ptr<CompilerInstance> Clang(
@@ -1701,7 +1702,8 @@ bool ASTUnit::LoadFromCompilerInvocation(
   Invocation->getPreprocessorOpts().RetainRemappedFileBuffers = true;
   Invocation->getFrontendOpts().DisableFree = false;
   getDiagnostics().Reset();
-  ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts());
+  ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts(),
+                        *VFS);
 
   std::unique_ptr<llvm::MemoryBuffer> OverrideMainBuffer;
   if (PrecompilePreambleAfterNParses > 0) {
@@ -1709,7 +1711,8 @@ bool ASTUnit::LoadFromCompilerInvocation(
     OverrideMainBuffer =
         getMainBufferWithPrecompiledPreamble(PCHContainerOps, *Invocation, VFS);
     getDiagnostics().Reset();
-    ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts());
+    ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts(),
+                          *VFS);
   }
 
   SimpleTimer ParsingTimer(WantTiming);
@@ -1902,7 +1905,8 @@ bool ASTUnit::Reparse(std::shared_ptr<PCHContainerOperations> PCHContainerOps,
   // Clear out the diagnostics state.
   FileMgr.reset();
   getDiagnostics().Reset();
-  ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts());
+  ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts(),
+                        *VFS);
   if (OverrideMainBuffer)
     getDiagnostics().setNumWarnings(NumWarningsInPreamble);
 
@@ -2241,7 +2245,8 @@ void ASTUnit::CodeComplete(
   CaptureDroppedDiagnostics Capture(CaptureDiagsKind::All,
                                     Clang->getDiagnostics(),
                                     &StoredDiagnostics, nullptr);
-  ProcessWarningOptions(Diag, Inv.getDiagnosticOpts());
+  ProcessWarningOptions(Diag, Inv.getDiagnosticOpts(),
+                        FileMgr.getVirtualFileSystem());
 
   // Create the target instance.
   if (!Clang->createTarget()) {