[clang] Disable -clear-ast-before-backend with -print-stats

[aeubanks]

Summary

We still need access to various things in the ASTContext when printing stats.

[dblaikie]

Could you check some of the stats output is valid/expected, not just corrupt/garbage? "just doesn't crash" isn't a great criteria for a test.

[aeubanks]

In D111973#3069304, @dblaikie wrote:

Could you check some of the stats output is valid/expected, not just corrupt/garbage? "just doesn't crash" isn't a great criteria for a test.

forgot to upload the diff, but I did so in the committed change

[aeubanks]

In D111973#3070519, @aeubanks wrote:

In D111973#3069304, @dblaikie wrote:

Could you check some of the stats output is valid/expected, not just corrupt/garbage? "just doesn't crash" isn't a great criteria for a test.

forgot to upload the diff, but I did so in the committed change

oh wait phab updated with the committed change, I didn't know that happened

clang/lib/Frontend/CompilerInvocation.cpp

static bool FixupInvocation(CompilerInvocation &Invocation,
   CodeGenOptions &CodeGenOpts = Invocation.getCodeGenOpts();
   TargetOptions &TargetOpts = Invocation.getTargetOpts();
   FrontendOptions &FrontendOpts = Invocation.getFrontendOpts();
   CodeGenOpts.XRayInstrumentFunctions = LangOpts.XRayInstrument;
   CodeGenOpts.XRayAlwaysEmitCustomEvents = LangOpts.XRayAlwaysEmitCustomEvents;
   CodeGenOpts.XRayAlwaysEmitTypedEvents = LangOpts.XRayAlwaysEmitTypedEvents;
   CodeGenOpts.DisableFree = FrontendOpts.DisableFree;
   FrontendOpts.GenerateGlobalModuleIndex = FrontendOpts.UseGlobalModuleIndex;
+  if (FrontendOpts.ShowStats)
+    CodeGenOpts.ClearASTBeforeBackend = false;
   LangOpts.SanitizeCoverage = CodeGenOpts.hasSanitizeCoverage();
   LangOpts.ForceEmitVTables = CodeGenOpts.ForceEmitVTables;
   LangOpts.SpeculativeLoadHardening = CodeGenOpts.SpeculativeLoadHardening;
   LangOpts.CurrentModule = LangOpts.ModuleName;
 
   llvm::Triple T(TargetOpts.Triple);
   llvm::Triple::ArchType Arch = T.getArch();
 

clang/test/Misc/clear-ast-before-backend.c

 // RUN: %clang_cc1 -clear-ast-before-backend %s -emit-obj -o /dev/null -O1
+// RUN: %clang_cc1 -clear-ast-before-backend %s -emit-obj -o /dev/null -print-stats 2>&1 | FileCheck %s
+
+// CHECK: *** Decl Stats:
+// CHECK: {{.*}} decls total
+// CHECK: 1 Function decls
+// CHECK: Total bytes =
 
 void f() {}