mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-04 05:17:07 +00:00
06c818e717
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6896 91177308-0d34-0410-b5e6-96231b3b80d8
105 lines
3.9 KiB
C++
105 lines
3.9 KiB
C++
//===- ExtractFunction.cpp - Extract a function from Program --------------===//
|
|
//
|
|
// This file implements a method that extracts a function from program, cleans
|
|
// it up, and returns it as a new module.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "BugDriver.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/PassManager.h"
|
|
#include "llvm/Transforms/IPO.h"
|
|
#include "llvm/Transforms/Scalar.h"
|
|
#include "llvm/Transforms/Utils/Cloning.h"
|
|
#include "llvm/Analysis/Verifier.h"
|
|
#include "llvm/Type.h"
|
|
#include "llvm/Constant.h"
|
|
#include "Support/CommandLine.h"
|
|
|
|
namespace {
|
|
cl::opt<bool>
|
|
NoADCE("disable-adce",
|
|
cl::desc("Do not use the -adce pass to reduce testcases"));
|
|
cl::opt<bool>
|
|
NoDCE ("disable-dce",
|
|
cl::desc("Do not use the -dce pass to reduce testcases"));
|
|
cl::opt<bool>
|
|
NoSCFG("disable-simplifycfg",
|
|
cl::desc("Do not use the -simplifycfg pass to reduce testcases"));
|
|
cl::opt<bool>
|
|
NoFinalCleanup("disable-final-cleanup",
|
|
cl::desc("Disable the final cleanup phase of narrowing"));
|
|
}
|
|
|
|
/// deleteInstructionFromProgram - This method clones the current Program and
|
|
/// deletes the specified instruction from the cloned module. It then runs a
|
|
/// series of cleanup passes (ADCE and SimplifyCFG) to eliminate any code which
|
|
/// depends on the value. The modified module is then returned.
|
|
///
|
|
Module *BugDriver::deleteInstructionFromProgram(Instruction *I,
|
|
unsigned Simplification) const {
|
|
Module *Result = CloneModule(Program);
|
|
|
|
BasicBlock *PBB = I->getParent();
|
|
Function *PF = PBB->getParent();
|
|
|
|
Module::iterator RFI = Result->begin(); // Get iterator to corresponding fn
|
|
std::advance(RFI, std::distance(Program->begin(), Module::iterator(PF)));
|
|
|
|
Function::iterator RBI = RFI->begin(); // Get iterator to corresponding BB
|
|
std::advance(RBI, std::distance(PF->begin(), Function::iterator(PBB)));
|
|
|
|
BasicBlock::iterator RI = RBI->begin(); // Get iterator to corresponding inst
|
|
std::advance(RI, std::distance(PBB->begin(), BasicBlock::iterator(I)));
|
|
I = RI; // Got the corresponding instruction!
|
|
|
|
// If this instruction produces a value, replace any users with null values
|
|
if (I->getType() != Type::VoidTy)
|
|
I->replaceAllUsesWith(Constant::getNullValue(I->getType()));
|
|
|
|
// Remove the instruction from the program.
|
|
I->getParent()->getInstList().erase(I);
|
|
|
|
// Spiff up the output a little bit.
|
|
PassManager Passes;
|
|
if (Simplification > 2 && !NoADCE)
|
|
Passes.add(createAggressiveDCEPass()); // Remove dead code...
|
|
//Passes.add(createInstructionCombiningPass());
|
|
if (Simplification > 1 && !NoDCE)
|
|
Passes.add(createDeadCodeEliminationPass());
|
|
if (Simplification && !NoSCFG)
|
|
Passes.add(createCFGSimplificationPass()); // Delete dead control flow
|
|
|
|
Passes.add(createVerifierPass());
|
|
Passes.run(*Result);
|
|
return Result;
|
|
}
|
|
|
|
/// performFinalCleanups - This method clones the current Program and performs
|
|
/// a series of cleanups intended to get rid of extra cruft on the module
|
|
/// before handing it to the user...
|
|
///
|
|
Module *BugDriver::performFinalCleanups() const {
|
|
Module *M = CloneModule(Program);
|
|
|
|
// Allow disabling these passes if they crash bugpoint.
|
|
//
|
|
// FIXME: This should eventually run these passes in a pass list to prevent
|
|
// them from being able to crash bugpoint at all!
|
|
//
|
|
if (NoFinalCleanup) return M;
|
|
|
|
// Make all functions external, so GlobalDCE doesn't delete them...
|
|
for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
|
|
I->setLinkage(GlobalValue::ExternalLinkage);
|
|
|
|
PassManager CleanupPasses;
|
|
CleanupPasses.add(createFunctionResolvingPass());
|
|
CleanupPasses.add(createGlobalDCEPass());
|
|
CleanupPasses.add(createDeadTypeEliminationPass());
|
|
CleanupPasses.add(createDeadArgEliminationPass(true));
|
|
CleanupPasses.add(createVerifierPass());
|
|
CleanupPasses.run(*M);
|
|
return M;
|
|
}
|