From fc360dc30be41b7ea941ae39fd8a847b6e0263c5 Mon Sep 17 00:00:00 2001
From: Adrian Prantl <aprantl@apple.com>
Date: Tue, 24 Feb 2015 04:25:59 +0000
Subject: Wrap clang module files in a Mach-O, ELF, or COFF container. This is
 a necessary prerequisite for debugging with modules. The .pcm files become
 containers that hold the serialized AST which allows us to store debug
 information in the module file that can be shared by all object files that
 were built importing the module.

rdar://problem/19104245

This reapplies r230044 with a fixed configure+make build and updated
dependencies. Take 3.

llvm-svn: 230305
---
 clang/lib/Frontend/FrontendActions.cpp | 40 ++++++++++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 4 deletions(-)

(limited to 'clang/lib/Frontend/FrontendActions.cpp')

diff --git a/clang/lib/Frontend/FrontendActions.cpp b/clang/lib/Frontend/FrontendActions.cpp
index a55a3257851..3e0f525e653 100644
--- a/clang/lib/Frontend/FrontendActions.cpp
+++ b/clang/lib/Frontend/FrontendActions.cpp
@@ -10,10 +10,13 @@
 #include "clang/Frontend/FrontendActions.h"
 #include "clang/AST/ASTConsumer.h"
 #include "clang/Basic/FileManager.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/CodeGen/CodeGenModuleContainer.h"
 #include "clang/Frontend/ASTConsumers.h"
 #include "clang/Frontend/ASTUnit.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/MultiplexConsumer.h"
 #include "clang/Frontend/Utils.h"
 #include "clang/Lex/HeaderSearch.h"
 #include "clang/Lex/Pragma.h"
@@ -85,8 +88,23 @@ GeneratePCHAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
 
   if (!CI.getFrontendOpts().RelocatablePCH)
     Sysroot.clear();
-  return llvm::make_unique<PCHGenerator>(CI.getPreprocessor(), OutputFile,
-                                         nullptr, Sysroot, OS);
+
+  std::vector<std::unique_ptr<ASTConsumer>> Consumers;
+  Consumers.push_back(llvm::make_unique<PCHGenerator>(CI.getPreprocessor(),
+                                                      OutputFile, nullptr,
+                                                      Sysroot));
+
+  auto CGOpts = CI.getCodeGenOpts();
+  // The debug info emitted by ModuleContainerGenerator is not affected by the
+  // optimization level.
+  CGOpts.OptimizationLevel = 0;
+  CGOpts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
+  Consumers.push_back(std::unique_ptr<ASTConsumer>(
+      CreateModuleContainerGenerator(CI.getDiagnostics(), "PCH", CGOpts,
+                                     CI.getTargetOpts(), CI.getLangOpts(), OS,
+                                     cast<PCHGenerator>(Consumers[0].get()))));
+
+  return llvm::make_unique<MultiplexConsumer>(std::move(Consumers));
 }
 
 bool GeneratePCHAction::ComputeASTConsumerArguments(CompilerInstance &CI,
@@ -122,8 +140,22 @@ GenerateModuleAction::CreateASTConsumer(CompilerInstance &CI,
   if (ComputeASTConsumerArguments(CI, InFile, Sysroot, OutputFile, OS))
     return nullptr;
 
-  return llvm::make_unique<PCHGenerator>(CI.getPreprocessor(), OutputFile,
-                                         Module, Sysroot, OS);
+  std::vector<std::unique_ptr<ASTConsumer>> Consumers;
+  Consumers.push_back(llvm::make_unique<PCHGenerator>(CI.getPreprocessor(),
+                                                      OutputFile, Module,
+                                                      Sysroot));
+
+  auto CGOpts = CI.getCodeGenOpts();
+  // The debug info emitted by ModuleContainerGenerator is not affected by the
+  // optimization level.
+  CGOpts.OptimizationLevel = 0;
+  CGOpts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
+  Consumers.push_back(
+      std::unique_ptr<ASTConsumer>(CreateModuleContainerGenerator(
+          CI.getDiagnostics(), Module->getFullModuleName(), CGOpts,
+          CI.getTargetOpts(), CI.getLangOpts(), OS,
+          cast<PCHGenerator>(Consumers[0].get()))));
+  return llvm::make_unique<MultiplexConsumer>(std::move(Consumers));
 }
 
 static SmallVectorImpl<char> &
-- 
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