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6520785dcd
out of a large function to reduce it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5408 91177308-0d34-0410-b5e6-96231b3b80d8
84 lines
3.4 KiB
C++
84 lines
3.4 KiB
C++
//===- ExtractFunction.cpp - Extract a function from Program --------------===//
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//
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// This file implements a method that extracts a function from program, cleans
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// it up, and returns it as a new module.
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//
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//===----------------------------------------------------------------------===//
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#include "BugDriver.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Utils/Cloning.h"
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#include "llvm/Type.h"
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#include "llvm/Constant.h"
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/// extractFunctionFromModule - This method is used to extract the specified
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/// (non-external) function from the current program, slim down the module, and
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/// then return it. This does not modify Program at all, it modifies a copy,
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/// which it returns.
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Module *BugDriver::extractFunctionFromModule(Function *F) const {
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Module *Result = CloneModule(Program);
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// Translate from the old module to the new copied module...
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Module::iterator RFI = Result->begin(); // Get iterator to corresponding fn
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std::advance(RFI, std::distance(Program->begin(), Module::iterator(F)));
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// In addition to just parsing the input from GCC, we also want to spiff it up
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// a little bit. Do this now.
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//
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PassManager Passes;
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Passes.add(createFunctionExtractionPass(RFI)); // Extract the function
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Passes.add(createGlobalDCEPass()); // Delete unreachable globals
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Passes.add(createFunctionResolvingPass()); // Delete prototypes
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Passes.add(createDeadTypeEliminationPass()); // Remove dead types...
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Passes.run(*Result);
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return Result;
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}
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/// deleteInstructionFromProgram - This method clones the current Program and
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/// deletes the specified instruction from the cloned module. It then runs a
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/// series of cleanup passes (ADCE and SimplifyCFG) to eliminate any code which
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/// depends on the value. The modified module is then returned.
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///
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Module *BugDriver::deleteInstructionFromProgram(Instruction *I,
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unsigned Simplification) const {
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Module *Result = CloneModule(Program);
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BasicBlock *PBB = I->getParent();
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Function *PF = PBB->getParent();
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Module::iterator RFI = Result->begin(); // Get iterator to corresponding fn
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std::advance(RFI, std::distance(Program->begin(), Module::iterator(PF)));
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Function::iterator RBI = RFI->begin(); // Get iterator to corresponding BB
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std::advance(RBI, std::distance(PF->begin(), Function::iterator(PBB)));
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BasicBlock::iterator RI = RBI->begin(); // Get iterator to corresponding inst
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std::advance(RI, std::distance(PBB->begin(), BasicBlock::iterator(I)));
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I = RI; // Got the corresponding instruction!
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// If this instruction produces a value, replace any users with null values
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if (I->getType() != Type::VoidTy)
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I->replaceAllUsesWith(Constant::getNullValue(I->getType()));
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// Remove the instruction from the program.
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I->getParent()->getInstList().erase(I);
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// In addition to just parsing the input from GCC, we also want to spiff it up
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// a little bit. Do this now.
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//
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PassManager Passes;
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if (Simplification > 2)
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Passes.add(createAggressiveDCEPass()); // Remove dead code...
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//Passes.add(createInstructionCombiningPass());
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if (Simplification > 1)
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Passes.add(createDeadCodeEliminationPass());
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if (Simplification)
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Passes.add(createCFGSimplificationPass()); // Delete dead control flow
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Passes.run(*Result);
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return Result;
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}
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