From: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date: Wed, 9 Nov 2011 01:24:17 +0000 (+0000)
Subject: [PCH] Fix reading from PCH of diagnostic pragmas.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=87429a05ff66fe6460eaa4855fd0da574e26bf7b;p=clang

[PCH] Fix reading from PCH of diagnostic pragmas.

In certain cases ASTReader would call the normal DiagnosticsEngine API to initialize
the state of diagnostic pragmas but DiagnosticsEngine would try to compare source locations
leading to crash because the main FileID was not yet initialized.

Yet another case of the ASTReader trying to use the normal APIs and inadvertently breaking
invariants. Fix this by having the ASTReader set up the internal state directly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144153 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/Basic/Diagnostic.h b/include/clang/Basic/Diagnostic.h
index 7dde271c38..78af10ce68 100644
--- a/include/clang/Basic/Diagnostic.h
+++ b/include/clang/Basic/Diagnostic.h
@@ -624,6 +624,21 @@ private:
   /// to insert, remove, or modify at a particular position.
   FixItHint FixItHints[MaxFixItHints];
 
+  DiagnosticMappingInfo makeMappingInfo(diag::Mapping Map, SourceLocation L) {
+    bool isPragma = L.isValid();
+    DiagnosticMappingInfo MappingInfo = DiagnosticMappingInfo::Make(
+      Map, /*IsUser=*/true, isPragma);
+
+    // If this is a pragma mapping, then set the diagnostic mapping flags so
+    // that we override command line options.
+    if (isPragma) {
+      MappingInfo.setNoWarningAsError(true);
+      MappingInfo.setNoErrorAsFatal(true);
+    }
+
+    return MappingInfo;
+  }
+
   /// ProcessDiag - This is the method used to report a diagnostic that is
   /// finally fully formed.
   ///
diff --git a/lib/Basic/Diagnostic.cpp b/lib/Basic/Diagnostic.cpp
index e5f390196d..7ea296233a 100644
--- a/lib/Basic/Diagnostic.cpp
+++ b/lib/Basic/Diagnostic.cpp
@@ -169,18 +169,9 @@ void DiagnosticsEngine::setDiagnosticMapping(diag::kind Diag, diag::Mapping Map,
          "Cannot map errors into warnings!");
   assert(!DiagStatePoints.empty());
 
-  bool isPragma = L.isValid();
   FullSourceLoc Loc(L, *SourceMgr);
   FullSourceLoc LastStateChangePos = DiagStatePoints.back().Loc;
-  DiagnosticMappingInfo MappingInfo = DiagnosticMappingInfo::Make(
-    Map, /*IsUser=*/true, isPragma);
-
-  // If this is a pragma mapping, then set the diagnostic mapping flags so that
-  // we override command line options.
-  if (isPragma) {
-    MappingInfo.setNoWarningAsError(true);
-    MappingInfo.setNoErrorAsFatal(true);
-  }
+  DiagnosticMappingInfo MappingInfo = makeMappingInfo(Map, L);
 
   // Common case; setting all the diagnostics of a group in one place.
   if (Loc.isInvalid() || Loc == LastStateChangePos) {
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index cbf6cd0c5c..3aeaf19cd5 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -3109,6 +3109,10 @@ void ASTReader::ReadPragmaDiagnosticMappings(DiagnosticsEngine &Diag) {
     unsigned Idx = 0;
     while (Idx < F.PragmaDiagMappings.size()) {
       SourceLocation Loc = ReadSourceLocation(F, F.PragmaDiagMappings[Idx++]);
+      Diag.DiagStates.push_back(*Diag.GetCurDiagState());
+      Diag.DiagStatePoints.push_back(
+          DiagnosticsEngine::DiagStatePoint(&Diag.DiagStates.back(),
+                                            FullSourceLoc(Loc, SourceMgr)));
       while (1) {
         assert(Idx < F.PragmaDiagMappings.size() &&
                "Invalid data, didn't find '-1' marking end of diag/map pairs");
@@ -3121,8 +3125,8 @@ void ASTReader::ReadPragmaDiagnosticMappings(DiagnosticsEngine &Diag) {
           break; // no more diag/map pairs for this location.
         }
         diag::Mapping Map = (diag::Mapping)F.PragmaDiagMappings[Idx++];
-        // The user bit gets set by WritePragmaDiagnosticMappings.
-        Diag.setDiagnosticMapping(DiagID, Map, Loc);
+        DiagnosticMappingInfo MappingInfo = Diag.makeMappingInfo(Map, Loc);
+        Diag.GetCurDiagState()->setMappingInfo(DiagID, MappingInfo);
       }
     }
   }
diff --git a/test/Index/Inputs/pragma_disable_warning.h b/test/Index/Inputs/pragma_disable_warning.h
new file mode 100644
index 0000000000..b40e9e7f97
--- /dev/null
+++ b/test/Index/Inputs/pragma_disable_warning.h
@@ -0,0 +1 @@
+#pragma clang diagnostic ignored "-Wunused-parameter"
diff --git a/test/Index/pragma-diag-reparse.c b/test/Index/pragma-diag-reparse.c
index 1dccd59523..71d0618d70 100644
--- a/test/Index/pragma-diag-reparse.c
+++ b/test/Index/pragma-diag-reparse.c
@@ -1,4 +1,5 @@
 #pragma clang diagnostic ignored "-Wtautological-compare"
+#include "pragma_disable_warning.h"
 
 int main (int argc, const char * argv[])
 {
@@ -13,6 +14,7 @@ int main (int argc, const char * argv[])
 void foo() { int b=0; while (b==b); }
 
 // RUN: env CINDEXTEST_EDITING=1 CINDEXTEST_FAILONERROR=1 c-index-test -test-load-source-reparse 5 local \
+// RUN: -I%S/Inputs \
 // RUN:   %s -Wall -Werror | FileCheck %s
 
-// CHECK: pragma-diag-reparse.c:7:7: VarDecl=x:7:7 (Definition) Extent=[7:3 - 7:10]
+// CHECK: pragma-diag-reparse.c:8:7: VarDecl=x:8:7 (Definition) Extent=[8:3 - 8:10]