310 lines
13 KiB
C
310 lines
13 KiB
C
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//===- BugDriver.h - Top-Level BugPoint class -------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This class contains all of the shared state and information that is used by
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// the BugPoint tool to track down errors in optimizations. This class is the
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// main driver class that invokes all sub-functionality.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_BUGPOINT_BUGDRIVER_H
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#define LLVM_TOOLS_BUGPOINT_BUGDRIVER_H
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#include "llvm/IR/ValueMap.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Transforms/Utils/ValueMapper.h"
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#include <memory>
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#include <string>
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#include <vector>
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namespace llvm {
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class Value;
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class PassInfo;
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class Module;
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class GlobalVariable;
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class Function;
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class BasicBlock;
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class AbstractInterpreter;
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class Instruction;
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class LLVMContext;
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class DebugCrashes;
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class CC;
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extern bool DisableSimplifyCFG;
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/// BugpointIsInterrupted - Set to true when the user presses ctrl-c.
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///
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extern bool BugpointIsInterrupted;
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class BugDriver {
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LLVMContext &Context;
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const char *ToolName; // argv[0] of bugpoint
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std::string ReferenceOutputFile; // Name of `good' output file
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std::unique_ptr<Module> Program; // The raw program, linked together
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std::vector<std::string> PassesToRun;
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AbstractInterpreter *Interpreter; // How to run the program
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AbstractInterpreter *SafeInterpreter; // To generate reference output, etc.
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CC *cc;
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bool run_find_bugs;
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unsigned Timeout;
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unsigned MemoryLimit;
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bool UseValgrind;
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// FIXME: sort out public/private distinctions...
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friend class ReducePassList;
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friend class ReduceMisCodegenFunctions;
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public:
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BugDriver(const char *toolname, bool find_bugs, unsigned timeout,
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unsigned memlimit, bool use_valgrind, LLVMContext &ctxt);
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~BugDriver();
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const char *getToolName() const { return ToolName; }
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LLVMContext &getContext() const { return Context; }
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// Set up methods... these methods are used to copy information about the
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// command line arguments into instance variables of BugDriver.
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//
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bool addSources(const std::vector<std::string> &FileNames);
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void addPass(std::string p) { PassesToRun.push_back(std::move(p)); }
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void setPassesToRun(const std::vector<std::string> &PTR) {
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PassesToRun = PTR;
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}
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const std::vector<std::string> &getPassesToRun() const { return PassesToRun; }
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/// run - The top level method that is invoked after all of the instance
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/// variables are set up from command line arguments. The \p as_child argument
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/// indicates whether the driver is to run in parent mode or child mode.
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///
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Error run();
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/// debugOptimizerCrash - This method is called when some optimizer pass
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/// crashes on input. It attempts to prune down the testcase to something
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/// reasonable, and figure out exactly which pass is crashing.
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///
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Error debugOptimizerCrash(const std::string &ID = "passes");
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/// debugCodeGeneratorCrash - This method is called when the code generator
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/// crashes on an input. It attempts to reduce the input as much as possible
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/// while still causing the code generator to crash.
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Error debugCodeGeneratorCrash();
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/// debugMiscompilation - This method is used when the passes selected are not
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/// crashing, but the generated output is semantically different from the
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/// input.
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Error debugMiscompilation();
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/// debugPassMiscompilation - This method is called when the specified pass
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/// miscompiles Program as input. It tries to reduce the testcase to
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/// something that smaller that still miscompiles the program.
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/// ReferenceOutput contains the filename of the file containing the output we
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/// are to match.
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///
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bool debugPassMiscompilation(const PassInfo *ThePass,
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const std::string &ReferenceOutput);
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/// compileSharedObject - This method creates a SharedObject from a given
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/// BitcodeFile for debugging a code generator.
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///
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Expected<std::string> compileSharedObject(const std::string &BitcodeFile);
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/// debugCodeGenerator - This method narrows down a module to a function or
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/// set of functions, using the CBE as a ``safe'' code generator for other
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/// functions that are not under consideration.
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Error debugCodeGenerator();
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/// isExecutingJIT - Returns true if bugpoint is currently testing the JIT
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///
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bool isExecutingJIT();
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Module &getProgram() const { return *Program; }
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/// Set the current module to the specified module, returning the old one.
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std::unique_ptr<Module> swapProgramIn(std::unique_ptr<Module> M);
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AbstractInterpreter *switchToSafeInterpreter() {
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AbstractInterpreter *Old = Interpreter;
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Interpreter = (AbstractInterpreter *)SafeInterpreter;
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return Old;
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}
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void switchToInterpreter(AbstractInterpreter *AI) { Interpreter = AI; }
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/// If we reduce or update the program somehow, call this method to update
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/// bugdriver with it. This deletes the old module and sets the specified one
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/// as the current program.
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void setNewProgram(std::unique_ptr<Module> M);
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/// Try to compile the specified module. This is used for code generation
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/// crash testing.
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Error compileProgram(Module &M) const;
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/// This method runs "Program", capturing the output of the program to a file.
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/// A recommended filename may be optionally specified.
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Expected<std::string> executeProgram(const Module &Program,
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std::string OutputFilename,
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std::string Bitcode,
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const std::string &SharedObjects,
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AbstractInterpreter *AI) const;
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/// Used to create reference output with the "safe" backend, if reference
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/// output is not provided. If there is a problem with the code generator
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/// (e.g., llc crashes), this will return false and set Error.
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Expected<std::string>
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executeProgramSafely(const Module &Program,
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const std::string &OutputFile) const;
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/// Calls compileProgram and then records the output into ReferenceOutputFile.
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/// Returns true if reference file created, false otherwise. Note:
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/// initializeExecutionEnvironment should be called BEFORE this function.
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Error createReferenceFile(Module &M, const std::string &Filename =
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"bugpoint.reference.out-%%%%%%%");
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/// This method executes the specified module and diffs the output against the
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/// file specified by ReferenceOutputFile. If the output is different, 1 is
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/// returned. If there is a problem with the code generator (e.g., llc
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/// crashes), this will return -1 and set Error.
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Expected<bool> diffProgram(const Module &Program,
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const std::string &BitcodeFile = "",
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const std::string &SharedObj = "",
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bool RemoveBitcode = false) const;
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/// This function is used to output M to a file named "bugpoint-ID.bc".
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void EmitProgressBitcode(const Module &M, const std::string &ID,
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bool NoFlyer = false) const;
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/// This method clones the current Program and deletes the specified
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/// instruction from the cloned module. It then runs a series of cleanup
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/// passes (ADCE and SimplifyCFG) to eliminate any code which depends on the
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/// value. The modified module is then returned.
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///
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std::unique_ptr<Module> deleteInstructionFromProgram(const Instruction *I,
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unsigned Simp);
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/// This method clones the current Program and performs a series of cleanups
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/// intended to get rid of extra cruft on the module. If the
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/// MayModifySemantics argument is true, then the cleanups is allowed to
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/// modify how the code behaves.
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///
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std::unique_ptr<Module> performFinalCleanups(std::unique_ptr<Module> M,
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bool MayModifySemantics = false);
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/// Given a module, extract up to one loop from it into a new function. This
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/// returns null if there are no extractable loops in the program or if the
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/// loop extractor crashes.
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std::unique_ptr<Module> extractLoop(Module *M);
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/// Extract all but the specified basic blocks into their own functions. The
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/// only detail is that M is actually a module cloned from the one the BBs are
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/// in, so some mapping needs to be performed. If this operation fails for
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/// some reason (ie the implementation is buggy), this function should return
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/// null, otherwise it returns a new Module.
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std::unique_ptr<Module>
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extractMappedBlocksFromModule(const std::vector<BasicBlock *> &BBs,
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Module *M);
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/// Carefully run the specified set of pass on the specified/ module,
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/// returning the transformed module on success, or a null pointer on failure.
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std::unique_ptr<Module> runPassesOn(Module *M,
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const std::vector<std::string> &Passes,
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ArrayRef<std::string> ExtraArgs = {});
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/// runPasses - Run the specified passes on Program, outputting a bitcode
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/// file and writting the filename into OutputFile if successful. If the
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/// optimizations fail for some reason (optimizer crashes), return true,
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/// otherwise return false. If DeleteOutput is set to true, the bitcode is
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/// deleted on success, and the filename string is undefined. This prints to
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/// outs() a single line message indicating whether compilation was successful
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/// or failed, unless Quiet is set. ExtraArgs specifies additional arguments
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/// to pass to the child bugpoint instance.
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///
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bool runPasses(Module &Program, const std::vector<std::string> &PassesToRun,
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std::string &OutputFilename, bool DeleteOutput = false,
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bool Quiet = false,
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ArrayRef<std::string> ExtraArgs = {}) const;
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/// runPasses - Just like the method above, but this just returns true or
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/// false indicating whether or not the optimizer crashed on the specified
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/// input (true = crashed). Does not produce any output.
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///
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bool runPasses(Module &M, const std::vector<std::string> &PassesToRun) const {
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std::string Filename;
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return runPasses(M, PassesToRun, Filename, true);
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}
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/// Take the specified pass list and create different combinations of passes
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/// to compile the program with. Compile the program with each set and mark
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/// test to see if it compiled correctly. If the passes compiled correctly
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/// output nothing and rearrange the passes into a new order. If the passes
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/// did not compile correctly, output the command required to recreate the
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/// failure.
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Error runManyPasses(const std::vector<std::string> &AllPasses);
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/// This writes the current "Program" to the named bitcode file. If an error
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/// occurs, true is returned.
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bool writeProgramToFile(const std::string &Filename, const Module &M) const;
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bool writeProgramToFile(const std::string &Filename, int FD,
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const Module &M) const;
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bool writeProgramToFile(int FD, const Module &M) const;
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private:
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/// initializeExecutionEnvironment - This method is used to set up the
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/// environment for executing LLVM programs.
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///
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Error initializeExecutionEnvironment();
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};
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struct DiscardTemp {
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sys::fs::TempFile &File;
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~DiscardTemp();
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};
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/// Given a bitcode or assembly input filename, parse and return it, or return
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/// null if not possible.
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///
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std::unique_ptr<Module> parseInputFile(StringRef InputFilename,
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LLVMContext &ctxt);
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/// getPassesString - Turn a list of passes into a string which indicates the
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/// command line options that must be passed to add the passes.
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///
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std::string getPassesString(const std::vector<std::string> &Passes);
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/// PrintFunctionList - prints out list of problematic functions
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///
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void PrintFunctionList(const std::vector<Function *> &Funcs);
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/// PrintGlobalVariableList - prints out list of problematic global variables
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///
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void PrintGlobalVariableList(const std::vector<GlobalVariable *> &GVs);
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// DeleteGlobalInitializer - "Remove" the global variable by deleting its
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// initializer, making it external.
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//
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void DeleteGlobalInitializer(GlobalVariable *GV);
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// DeleteFunctionBody - "Remove" the function by deleting all of it's basic
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// blocks, making it external.
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//
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void DeleteFunctionBody(Function *F);
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/// Given a module and a list of functions in the module, split the functions
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/// OUT of the specified module, and place them in the new module.
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std::unique_ptr<Module>
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SplitFunctionsOutOfModule(Module *M, const std::vector<Function *> &F,
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ValueToValueMapTy &VMap);
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} // End llvm namespace
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#endif
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