[gcmole] Add support for DisallowGarbageCollection

Add support for DisallowGarbageCollection scope. This scope will be
introduced once this CL landed.

DisallowGarbageCollection works like DisallowHeapAllocation but also
disallows safepoints.

Bug: v8:10315
Change-Id: Ia7d777d4104b32810dd481ad9dbdf0edd075b6cf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2395561
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69881}

tools/gcmole/gcmole-tools.tar.gz.sha1

-0af04ef475bc746a501fe17d3b56ccb03fc151fc
+ffcb7a55a1310c139f83204a96c939beedf16df7

tools/gcmole/gcmole.cc

@@ -685,6 +685,7 @@ class FunctionAnalyzer {
                    clang::CXXRecordDecl* maybe_object_decl,
                    clang::CXXRecordDecl* smi_decl,
                    clang::CXXRecordDecl* no_gc_decl,
+                   clang::CXXRecordDecl* no_gc_or_safepoint_decl,
                    clang::CXXRecordDecl* no_heap_access_decl,
                    clang::DiagnosticsEngine& d, clang::SourceManager& sm)
       : ctx_(ctx),
@@ -692,6 +693,7 @@ class FunctionAnalyzer {
         maybe_object_decl_(maybe_object_decl),
         smi_decl_(smi_decl),
         no_gc_decl_(no_gc_decl),
+        no_gc_or_safepoint_decl_(no_gc_or_safepoint_decl),
         no_heap_access_decl_(no_heap_access_decl),
         d_(d),
         sm_(sm),
@@ -1406,6 +1408,8 @@ class FunctionAnalyzer {
     }
 
     return (no_gc_decl_ && IsDerivedFrom(definition, no_gc_decl_)) ||
+           (no_gc_or_safepoint_decl_ &&
+            IsDerivedFrom(definition, no_gc_or_safepoint_decl_)) ||
            (no_heap_access_decl_ &&
             IsDerivedFrom(definition, no_heap_access_decl_));
   }
@@ -1491,6 +1495,7 @@ class FunctionAnalyzer {
   clang::CXXRecordDecl* maybe_object_decl_;
   clang::CXXRecordDecl* smi_decl_;
   clang::CXXRecordDecl* no_gc_decl_;
+  clang::CXXRecordDecl* no_gc_or_safepoint_decl_;
   clang::CXXRecordDecl* no_heap_access_decl_;
 
   clang::DiagnosticsEngine& d_;
@@ -1557,6 +1562,11 @@ class ProblemsFinder : public clang::ASTConsumer,
             .ResolveNamespace("internal")
             .ResolveTemplate("DisallowHeapAllocation");
 
+    clang::CXXRecordDecl* no_gc_or_safepoint_decl =
+        r.ResolveNamespace("v8")
+            .ResolveNamespace("internal")
+            .ResolveTemplate("DisallowGarbageCollection");
+
     clang::CXXRecordDecl* no_heap_access_decl =
         r.ResolveNamespace("v8")
             .ResolveNamespace("internal")
@@ -1586,10 +1596,10 @@ class ProblemsFinder : public clang::ASTConsumer,
       no_heap_access_decl = no_heap_access_decl->getDefinition();
 
     if (object_decl != NULL && smi_decl != NULL && maybe_object_decl != NULL) {
-      function_analyzer_ =
-          new FunctionAnalyzer(clang::ItaniumMangleContext::create(ctx, d_),
-                               object_decl, maybe_object_decl, smi_decl,
-                               no_gc_decl, no_heap_access_decl, d_, sm_);
+      function_analyzer_ = new FunctionAnalyzer(
+          clang::ItaniumMangleContext::create(ctx, d_), object_decl,
+          maybe_object_decl, smi_decl, no_gc_decl, no_gc_or_safepoint_decl,
+          no_heap_access_decl, d_, sm_);
       TraverseDecl(ctx.getTranslationUnitDecl());
     } else {
       if (object_decl == NULL) {