1 files changed, 249 insertions, 0 deletions
diff --git a/lib/Module/OptimizeLegacy.cpp b/lib/Module/OptimizeLegacy.cpp
new file mode 100644
index 00000000..53488924
--- /dev/null
+++ b/lib/Module/OptimizeLegacy.cpp
@@ -0,0 +1,249 @@
+// FIXME: This file is a bastard child of opt.cpp and llvm-ld's
+// Optimize.cpp. This stuff should live in common code.
+
+//===- Optimize.cpp - Optimize a complete program -------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements all optimization of the linked module for llvm-ld.
+//
+//===----------------------------------------------------------------------===//
+
+#include "klee/Config/Version.h"
+#include "klee/Support/OptionCategories.h"
+
+#include "klee/Support/CompilerWarning.h"
+
+#include "ModuleHelper.h"
+
+DISABLE_WARNING_PUSH
+DISABLE_WARNING_DEPRECATED_DECLARATIONS
+#include "llvm/Analysis/GlobalsModRef.h"
+#include "llvm/Analysis/LoopPass.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Verifier.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/IPO/FunctionAttrs.h"
+#include "llvm/Transforms/InstCombine/InstCombine.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/Transforms/Scalar/GVN.h"
+#include "llvm/Transforms/Utils.h"
+DISABLE_WARNING_POP
+
+using namespace llvm;
+using namespace klee;
+
+namespace {
+static cl::opt<bool>
+    DisableInline("disable-inlining",
+                  cl::desc("Do not run the inliner pass (default=false)"),
+                  cl::init(false), cl::cat(klee::ModuleCat));
+
+static cl::opt<bool> DisableInternalize(
+    "disable-internalize",
+    cl::desc("Do not mark all symbols as internal (default=false)"),
+    cl::init(false), cl::cat(klee::ModuleCat));
+
+static cl::opt<bool> VerifyEach("verify-each",
+                                cl::desc("Verify intermediate results of all "
+                                         "optimization passes (default=false)"),
+                                cl::init(false), cl::cat(klee::ModuleCat));
+
+static cl::opt<bool>
+    Strip("strip-all", cl::desc("Strip all symbol information from executable"),
+          cl::init(false), cl::cat(klee::ModuleCat));
+
+static cl::opt<bool>
+    StripDebug("strip-debug",
+               cl::desc("Strip debugger symbol info from executable"),
+               cl::init(false), cl::cat(klee::ModuleCat));
+
+// A utility function that adds a pass to the pass manager but will also add
+// a verifier pass after if we're supposed to verify.
+static inline void addPass(legacy::PassManager &PM, Pass *P) {
+  // Add the pass to the pass manager...
+  PM.add(P);
+
+  // If we are verifying all of the intermediate steps, add the verifier...
+  if (VerifyEach)
+    PM.add(createVerifierPass());
+}
+} // namespace
+
+static void AddStandardCompilePasses(legacy::PassManager &PM) {
+  PM.add(createVerifierPass()); // Verify that input is correct
+
+  // If the -strip-debug command line option was specified, do it.
+  if (StripDebug)
+    addPass(PM, createStripSymbolsPass(true));
+
+  addPass(PM, createCFGSimplificationPass());       // Clean up disgusting code
+  addPass(PM, createPromoteMemoryToRegisterPass()); // Kill useless allocas
+  addPass(PM, createGlobalOptimizerPass());         // Optimize out global vars
+  addPass(PM, createGlobalDCEPass()); // Remove unused fns and globs
+#if LLVM_VERSION_CODE >= LLVM_VERSION(11, 0)
+  addPass(PM, createSCCPPass()); // Constant prop with SCCP
+#else
+  addPass(PM, createIPConstantPropagationPass()); // IP Constant Propagation
+#endif
+  addPass(PM, createDeadArgEliminationPass());   // Dead argument elimination
+  addPass(PM, createInstructionCombiningPass()); // Clean up after IPCP & DAE
+  addPass(PM, createCFGSimplificationPass());    // Clean up after IPCP & DAE
+
+  addPass(PM, createPruneEHPass()); // Remove dead EH info
+  addPass(PM, createPostOrderFunctionAttrsLegacyPass());
+  addPass(PM,
+          createReversePostOrderFunctionAttrsPass()); // Deduce function attrs
+
+  if (!DisableInline)
+    addPass(PM, createFunctionInliningPass()); // Inline small functions
+  addPass(PM, createArgumentPromotionPass());  // Scalarize uninlined fn args
+
+  addPass(PM, createInstructionCombiningPass()); // Cleanup for scalarrepl.
+  addPass(PM, createJumpThreadingPass());        // Thread jumps.
+  addPass(PM, createCFGSimplificationPass());    // Merge & remove BBs
+  addPass(PM, createSROAPass());                 // Break up aggregate allocas
+  addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
+
+  addPass(PM, createTailCallEliminationPass()); // Eliminate tail calls
+  addPass(PM, createCFGSimplificationPass());   // Merge & remove BBs
+  addPass(PM, createReassociatePass());         // Reassociate expressions
+  addPass(PM, createLoopRotatePass());
+  addPass(PM, createLICMPass());         // Hoist loop invariants
+  addPass(PM, createLoopUnswitchPass()); // Unswitch loops.
+  // FIXME : Removing instcombine causes nestedloop regression.
+  addPass(PM, createInstructionCombiningPass());
+  addPass(PM, createIndVarSimplifyPass());       // Canonicalize indvars
+  addPass(PM, createLoopDeletionPass());         // Delete dead loops
+  addPass(PM, createLoopUnrollPass());           // Unroll small loops
+  addPass(PM, createInstructionCombiningPass()); // Clean up after the unroller
+  addPass(PM, createGVNPass());                  // Remove redundancies
+  addPass(PM, createMemCpyOptPass());            // Remove memcpy / form memset
+  addPass(PM, createSCCPPass());                 // Constant prop with SCCP
+
+  // Run instcombine after redundancy elimination to exploit opportunities
+  // opened up by them.
+  addPass(PM, createInstructionCombiningPass());
+
+  addPass(PM, createDeadStoreEliminationPass()); // Delete dead stores
+  addPass(PM, createAggressiveDCEPass());        // Delete dead instructions
+  addPass(PM, createCFGSimplificationPass());    // Merge & remove BBs
+  addPass(PM, createStripDeadPrototypesPass());  // Get rid of dead prototypes
+  addPass(PM, createConstantMergePass());        // Merge dup global constants
+}
+
+/// Optimize - Perform link time optimizations. This will run the scalar
+/// optimizations, any loaded plugin-optimization modules, and then the
+/// inter-procedural optimizations if applicable.
+void klee::optimizeModule(llvm::Module *M,
+                          llvm::ArrayRef<const char *> preservedFunctions) {
+
+  // Instantiate the pass manager to organize the passes.
+  legacy::PassManager Passes;
+
+  // If we're verifying, start off with a verification pass.
+  if (VerifyEach)
+    Passes.add(createVerifierPass());
+
+  // DWD - Run the opt standard pass list as well.
+  AddStandardCompilePasses(Passes);
+
+  // Now that composite has been compiled, scan through the module, looking
+  // for a main function.  If main is defined, mark all other functions
+  // internal.
+  if (!DisableInternalize) {
+    auto PreserveFunctions = [=](const llvm::GlobalValue &GV) {
+      StringRef GVName = GV.getName();
+
+      for (const char *fun : preservedFunctions)
+        if (GVName.equals(fun))
+          return true;
+
+      return false;
+    };
+    ModulePass *pass = createInternalizePass(PreserveFunctions);
+    addPass(Passes, pass);
+  }
+
+  // Propagate constants at call sites into the functions they call.  This
+  // opens opportunities for globalopt (and inlining) by substituting function
+  // pointers passed as arguments to direct uses of functions.
+  addPass(Passes, createIPSCCPPass());
+
+  // Now that we internalized some globals, see if we can hack on them!
+  addPass(Passes, createGlobalOptimizerPass());
+
+  // Linking modules together can lead to duplicated global constants, only
+  // keep one copy of each constant...
+  addPass(Passes, createConstantMergePass());
+
+  // Remove unused arguments from functions...
+  addPass(Passes, createDeadArgEliminationPass());
+
+  // Reduce the code after globalopt and ipsccp.  Both can open up significant
+  // simplification opportunities, and both can propagate functions through
+  // function pointers.  When this happens, we often have to resolve varargs
+  // calls, etc, so let instcombine do this.
+  addPass(Passes, createInstructionCombiningPass());
+
+  if (!DisableInline)
+    addPass(Passes, createFunctionInliningPass()); // Inline small functions
+
+  addPass(Passes, createPruneEHPass());         // Remove dead EH info
+  addPass(Passes, createGlobalOptimizerPass()); // Optimize globals again.
+  addPass(Passes, createGlobalDCEPass());       // Remove dead functions
+
+  // If we didn't decide to inline a function, check to see if we can
+  // transform it to pass arguments by value instead of by reference.
+  addPass(Passes, createArgumentPromotionPass());
+
+  // The IPO passes may leave cruft around.  Clean up after them.
+  addPass(Passes, createInstructionCombiningPass());
+  addPass(Passes, createJumpThreadingPass()); // Thread jumps.
+  addPass(Passes, createSROAPass());          // Break up allocas
+
+  // Run a few AA driven optimizations here and now, to cleanup the code.
+  addPass(Passes, createPostOrderFunctionAttrsLegacyPass());
+  addPass(Passes, createReversePostOrderFunctionAttrsPass()); // Add nocapture
+  addPass(Passes, createGlobalsAAWrapperPass()); // IP alias analysis
+
+  addPass(Passes, createLICMPass());                 // Hoist loop invariants
+  addPass(Passes, createGVNPass());                  // Remove redundancies
+  addPass(Passes, createMemCpyOptPass());            // Remove dead memcpy's
+  addPass(Passes, createDeadStoreEliminationPass()); // Nuke dead stores
+
+  // Cleanup and simplify the code after the scalar optimizations.
+  addPass(Passes, createInstructionCombiningPass());
+
+  addPass(Passes, createJumpThreadingPass());           // Thread jumps.
+  addPass(Passes, createPromoteMemoryToRegisterPass()); // Cleanup jumpthread.
+
+  // Delete basic blocks, which optimization passes may have killed...
+  addPass(Passes, createCFGSimplificationPass());
+
+  // Now that we have optimized the program, discard unreachable functions...
+  addPass(Passes, createGlobalDCEPass());
+
+  // If the -s or -S command line options were specified, strip the symbols out
+  // of the resulting program to make it smaller.  -s and -S are GNU ld options
+  // that we are supporting; they alias -strip-all and -strip-debug.
+  if (Strip || StripDebug)
+    addPass(Passes, createStripSymbolsPass(StripDebug && !Strip));
+
+  // The user's passes may leave cruft around; clean up after them.
+  addPass(Passes, createInstructionCombiningPass());
+  addPass(Passes, createCFGSimplificationPass());
+  addPass(Passes, createAggressiveDCEPass());
+  addPass(Passes, createGlobalDCEPass());
+
+  // Run our queue of passes all at once now, efficiently.
+  Passes.run(*M);
+}