From: Igor Laevsky <igmyrj@gmail.com>
Date: Thu, 16 Nov 2017 15:23:08 +0000 (+0000)
Subject: [FuzzMutate] NFC. Move parseModule and writeModule from llvm-isel-fuzzer into FuzzMutate.
X-Git-Tag: llvmorg-6.0.0-rc1~3238
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e714ef49afef7fc2d6f478974acf2c49860d05dc;p=platform%2Fupstream%2Fllvm.git

[FuzzMutate] NFC. Move parseModule and writeModule from llvm-isel-fuzzer into FuzzMutate.
This is to be able to reuse them in the llvm-opt-fuzzer.

llvm-svn: 318407
---

diff --git a/llvm/include/llvm/FuzzMutate/FuzzerCLI.h b/llvm/include/llvm/FuzzMutate/FuzzerCLI.h
index c7350f6..a775fdf 100644
--- a/llvm/include/llvm/FuzzMutate/FuzzerCLI.h
+++ b/llvm/include/llvm/FuzzMutate/FuzzerCLI.h
@@ -16,6 +16,7 @@
 #define LLVM_FUZZMUTATE_FUZZER_CLI_H
 
 #include "llvm/ADT/StringRef.h"
+#include "llvm/IR/LLVMContext.h"
 #include "llvm/Support/DataTypes.h"
 
 namespace llvm {
@@ -50,6 +51,23 @@ using FuzzerInitFun = int (*)(int *argc, char ***argv);
 int runFuzzerOnInputs(int ArgC, char *ArgV[], FuzzerTestFun TestOne,
                       FuzzerInitFun Init = [](int *, char ***) { return 0; });
 
+/// Fuzzer friendly interface for the llvm bitcode parser.
+///
+/// \param Data Bitcode we are going to parse
+/// \param Size Size of the 'Data' in bytes
+/// \return New module or nullptr in case of error
+std::unique_ptr<Module> parseModule(const uint8_t *Data, size_t Size,
+                                    LLVMContext &Context);
+
+/// Fuzzer friendly interface for the llvm bitcode printer.
+///
+/// \param M Module to print
+/// \param Dest Location to store serialized module
+/// \param MaxSize Size of the destination buffer
+/// \return Number of bytes that were written. When module size exceeds MaxSize
+///         returns 0 and leaves Dest unchanged.
+size_t writeModule(const Module &M, uint8_t *Dest, size_t MaxSize);
+
 } // end llvm namespace
 
 #endif // LLVM_FUZZMUTATE_FUZZER_CLI_H
diff --git a/llvm/lib/FuzzMutate/FuzzerCLI.cpp b/llvm/lib/FuzzMutate/FuzzerCLI.cpp
index 906f7af..158edf2 100644
--- a/llvm/lib/FuzzMutate/FuzzerCLI.cpp
+++ b/llvm/lib/FuzzMutate/FuzzerCLI.cpp
@@ -9,10 +9,14 @@
 
 #include "llvm/FuzzMutate/FuzzerCLI.h"
 #include "llvm/ADT/Triple.h"
+#include "llvm/Bitcode/BitcodeReader.h"
+#include "llvm/Bitcode/BitcodeWriter.h"
+#include "llvm/IR/LLVMContext.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/SourceMgr.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
@@ -131,3 +135,35 @@ int llvm::runFuzzerOnInputs(int ArgC, char *ArgV[], FuzzerTestFun TestOne,
   }
   return 0;
 }
+
+std::unique_ptr<Module> llvm::parseModule(
+    const uint8_t *Data, size_t Size, LLVMContext &Context) {
+
+  if (Size <= 1)
+    // We get bogus data given an empty corpus - just create a new module.
+    return llvm::make_unique<Module>("M", Context);
+
+  auto Buffer = MemoryBuffer::getMemBuffer(
+      StringRef(reinterpret_cast<const char *>(Data), Size), "Fuzzer input",
+      /*RequiresNullTerminator=*/false);
+
+  SMDiagnostic Err;
+  auto M = parseBitcodeFile(Buffer->getMemBufferRef(), Context);
+  if (Error E = M.takeError()) {
+    errs() << toString(std::move(E)) << "\n";
+    return nullptr;
+  }
+  return std::move(M.get());
+}
+
+size_t llvm::writeModule(const Module &M, uint8_t *Dest, size_t MaxSize) {
+  std::string Buf;
+  {
+    raw_string_ostream OS(Buf);
+    WriteBitcodeToFile(&M, OS);
+  }
+  if (Buf.size() > MaxSize)
+      return 0;
+  memcpy(Dest, Buf.data(), Buf.size());
+  return Buf.size();
+}
diff --git a/llvm/tools/llvm-isel-fuzzer/llvm-isel-fuzzer.cpp b/llvm/tools/llvm-isel-fuzzer/llvm-isel-fuzzer.cpp
index cc886ad..f0a963b 100644
--- a/llvm/tools/llvm-isel-fuzzer/llvm-isel-fuzzer.cpp
+++ b/llvm/tools/llvm-isel-fuzzer/llvm-isel-fuzzer.cpp
@@ -52,33 +52,6 @@ TargetTriple("mtriple", cl::desc("Override target triple for module"));
 static std::unique_ptr<TargetMachine> TM;
 static std::unique_ptr<IRMutator> Mutator;
 
-static std::unique_ptr<Module> parseModule(const uint8_t *Data, size_t Size,
-                                           LLVMContext &Context) {
-  auto Buffer = MemoryBuffer::getMemBuffer(
-      StringRef(reinterpret_cast<const char *>(Data), Size), "Fuzzer input",
-      /*RequiresNullTerminator=*/false);
-
-  SMDiagnostic Err;
-  auto M = parseBitcodeFile(Buffer->getMemBufferRef(), Context);
-  if (Error E = M.takeError()) {
-    errs() << toString(std::move(E)) << "\n";
-    return nullptr;
-  }
-  return std::move(M.get());
-}
-
-static size_t writeModule(const Module &M, uint8_t *Dest, size_t MaxSize) {
-  std::string Buf;
-  {
-    raw_string_ostream OS(Buf);
-    WriteBitcodeToFile(&M, OS);
-  }
-  if (Buf.size() > MaxSize)
-    return 0;
-  memcpy(Dest, Buf.data(), Buf.size());
-  return Buf.size();
-}
-
 std::unique_ptr<IRMutator> createISelMutator() {
   std::vector<TypeGetter> Types{
       Type::getInt1Ty,  Type::getInt8Ty,  Type::getInt16Ty, Type::getInt32Ty,
diff --git a/llvm/tools/llvm-opt-fuzzer/llvm-opt-fuzzer.cpp b/llvm/tools/llvm-opt-fuzzer/llvm-opt-fuzzer.cpp
index 1bbfa5b..7ca1d93 100644
--- a/llvm/tools/llvm-opt-fuzzer/llvm-opt-fuzzer.cpp
+++ b/llvm/tools/llvm-opt-fuzzer/llvm-opt-fuzzer.cpp
@@ -37,42 +37,6 @@ static cl::opt<std::string> PassPipeline(
 static std::unique_ptr<IRMutator> Mutator;
 static std::unique_ptr<TargetMachine> TM;
 
-// This function is mostly copied from the llvm-isel-fuzzer.
-// TODO: Move this into FuzzMutate library and reuse.
-static std::unique_ptr<Module> parseModule(const uint8_t *Data, size_t Size,
-                                           LLVMContext &Context) {
-
-  if (Size <= 1)
-    // We get bogus data given an empty corpus - just create a new module.
-    return llvm::make_unique<Module>("M", Context);
-
-  auto Buffer = MemoryBuffer::getMemBuffer(
-      StringRef(reinterpret_cast<const char *>(Data), Size), "Fuzzer input",
-      /*RequiresNullTerminator=*/false);
-
-  SMDiagnostic Err;
-  auto M = parseBitcodeFile(Buffer->getMemBufferRef(), Context);
-  if (Error E = M.takeError()) {
-    errs() << toString(std::move(E)) << "\n";
-    return nullptr;
-  }
-  return std::move(M.get());
-}
-
-// This function is copied from the llvm-isel-fuzzer.
-// TODO: Move this into FuzzMutate library and reuse.
-static size_t writeModule(const Module &M, uint8_t *Dest, size_t MaxSize) {
-  std::string Buf;
-  {
-    raw_string_ostream OS(Buf);
-    WriteBitcodeToFile(&M, OS);
-  }
-  if (Buf.size() > MaxSize)
-      return 0;
-  memcpy(Dest, Buf.data(), Buf.size());
-  return Buf.size();
-}
-
 std::unique_ptr<IRMutator> createOptMutator() {
   std::vector<TypeGetter> Types{
       Type::getInt1Ty,  Type::getInt8Ty,  Type::getInt16Ty, Type::getInt32Ty,