From 38fe30a595fdc61bb4258567c5251b99f2fd8faa Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Fri, 7 May 2010 16:22:32 +0000
Subject: [PATCH] Add a simple module-level debug info printer. It just sets up
 a DebugInfoFinder and iterates over all the contents calling print.

llvm-svn: 103262
---
 include/llvm/Analysis/Passes.h          |  3 +
 include/llvm/LinkAllPasses.h            |  1 +
 lib/Analysis/CMakeLists.txt             |  1 +
 lib/Analysis/ModuleDebugInfoPrinter.cpp | 86 +++++++++++++++++++++++++
 4 files changed, 91 insertions(+)
 create mode 100644 lib/Analysis/ModuleDebugInfoPrinter.cpp

diff --git a/include/llvm/Analysis/Passes.h b/include/llvm/Analysis/Passes.h
index 1a5cbb2298b..ce3f7a6677a 100644
--- a/include/llvm/Analysis/Passes.h
+++ b/include/llvm/Analysis/Passes.h
@@ -153,6 +153,9 @@ namespace llvm {
 
   // print debug info intrinsics in human readable form
   FunctionPass *createDbgInfoPrinterPass();
+
+  // Print module-level debug info metadata in human-readable form.
+  ModulePass *createModuleDebugInfoPrinterPass();
 }
 
 #endif
diff --git a/include/llvm/LinkAllPasses.h b/include/llvm/LinkAllPasses.h
index 24d2942ef4c..c2375eaab11 100644
--- a/include/llvm/LinkAllPasses.h
+++ b/include/llvm/LinkAllPasses.h
@@ -132,6 +132,7 @@ namespace {
       (void) llvm::createPrintModulePass(0);
       (void) llvm::createPrintFunctionPass("", 0);
       (void) llvm::createDbgInfoPrinterPass();
+      (void) llvm::createModuleDebugInfoPrinterPass();
       (void) llvm::createPartialInliningPass();
       (void) llvm::createSSIPass();
       (void) llvm::createSSIEverythingPass();
diff --git a/lib/Analysis/CMakeLists.txt b/lib/Analysis/CMakeLists.txt
index ad05dd99940..5a37ce09735 100644
--- a/lib/Analysis/CMakeLists.txt
+++ b/lib/Analysis/CMakeLists.txt
@@ -28,6 +28,7 @@ add_llvm_library(LLVMAnalysis
   LoopPass.cpp
   MemoryBuiltins.cpp
   MemoryDependenceAnalysis.cpp
+  ModuleDebugInfoPrinter.cpp
   PHITransAddr.cpp
   PointerTracking.cpp
   PostDominators.cpp
diff --git a/lib/Analysis/ModuleDebugInfoPrinter.cpp b/lib/Analysis/ModuleDebugInfoPrinter.cpp
new file mode 100644
index 00000000000..556d4c8aab5
--- /dev/null
+++ b/lib/Analysis/ModuleDebugInfoPrinter.cpp
@@ -0,0 +1,86 @@
+//===-- ModuleDebugInfoPrinter.cpp - Prints module debug info metadata ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass decodes the debug info metadata in a module and prints in a
+// (sufficiently-prepared-) human-readable form.
+//
+// For example, run this pass from opt along with the -analyze option, and
+// it'll print to standard output.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/Passes.h"
+#include "llvm/Analysis/DebugInfo.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/Pass.h"
+#include "llvm/Function.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/Statistic.h"
+using namespace llvm;
+
+namespace {
+  class ModuleDebugInfoPrinter : public ModulePass {
+    DebugInfoFinder Finder;
+  public:
+    static char ID; // Pass identification, replacement for typeid
+    ModuleDebugInfoPrinter() : ModulePass(&ID) {}
+
+    virtual bool runOnModule(Module &M);
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesAll();
+    }
+    virtual void print(raw_ostream &O, const Module *M) const;
+  };
+}
+
+char ModuleDebugInfoPrinter::ID = 0;
+static RegisterPass<ModuleDebugInfoPrinter>
+X("module-debuginfo",
+  "Decodes module-level debug info", false, true);
+
+ModulePass *llvm::createModuleDebugInfoPrinterPass() {
+  return new ModuleDebugInfoPrinter();
+}
+
+bool ModuleDebugInfoPrinter::runOnModule(Module &M) {
+  Finder.processModule(M);
+  return false;
+}
+
+void ModuleDebugInfoPrinter::print(raw_ostream &O, const Module *M) const {
+  for (DebugInfoFinder::iterator I = Finder.compile_unit_begin(),
+       E = Finder.compile_unit_end(); I != E; ++I) {
+    O << "Compile Unit: ";
+    DICompileUnit(*I).print(O);
+    O << '\n';
+  }
+
+  for (DebugInfoFinder::iterator I = Finder.subprogram_begin(),
+       E = Finder.subprogram_end(); I != E; ++I) {
+    O << "Subprogram: ";
+    DISubprogram(*I).print(O);
+    O << '\n';
+  }
+
+  for (DebugInfoFinder::iterator I = Finder.global_variable_begin(),
+       E = Finder.global_variable_end(); I != E; ++I) {
+    O << "GlobalVariable: ";
+    DIGlobalVariable(*I).print(O);
+    O << '\n';
+  }
+
+  for (DebugInfoFinder::iterator I = Finder.type_begin(),
+       E = Finder.type_end(); I != E; ++I) {
+    O << "Type: ";
+    DIType(*I).print(O);
+    O << '\n';
+  }
+}