mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5119 91177308-0d34-0410-b5e6-96231b3b80d8
132 lines
4.4 KiB
C++
132 lines
4.4 KiB
C++
//===- CrashDebugger.cpp - Debug compilation crashes ----------------------===//
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//
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// This file defines the bugpoint internals that narrow down compilation crashes
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//
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//===----------------------------------------------------------------------===//
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#include "BugDriver.h"
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#include "SystemUtils.h"
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#include "llvm/Module.h"
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#include "llvm/Bytecode/Writer.h"
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#include "llvm/Pass.h"
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#include <fstream>
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/// debugCrash - This method is called when some pass crashes on input. It
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/// attempts to prune down the testcase to something reasonable, and figure
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/// out exactly which pass is crashing.
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///
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bool BugDriver::debugCrash() {
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std::cout << "\n*** Debugging optimizer crash!\n";
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// Determine which pass causes the optimizer to crash... using binary search
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unsigned LastToPass = 0, LastToCrash = PassesToRun.size();
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while (LastToPass != LastToCrash) {
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unsigned Mid = (LastToCrash+LastToPass+1) / 2;
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std::vector<const PassInfo*> P(PassesToRun.begin(),
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PassesToRun.begin()+Mid);
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std::cout << "Checking to see if the first " << Mid << " passes crash: ";
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if (runPasses(P))
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LastToCrash = Mid-1;
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else
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LastToPass = Mid;
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}
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// Make sure something crashed. :)
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if (LastToCrash >= PassesToRun.size()) {
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std::cerr << "ERROR: No passes crashed!\n";
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return true;
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}
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// Calculate which pass it is that crashes...
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const PassInfo *CrashingPass = PassesToRun[LastToCrash];
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std::cout << "\n*** Found crashing pass '-" << CrashingPass->getPassArgument()
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<< "': " << CrashingPass->getPassName() << "\n";
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// Compile the program with just the passes that don't crash.
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if (LastToPass != 0) { // Don't bother doing this if the first pass crashes...
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std::vector<const PassInfo*> P(PassesToRun.begin(),
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PassesToRun.begin()+LastToPass);
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std::string Filename;
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std::cout << "Running passes that don't crash to get input for pass: ";
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if (runPasses(P, Filename)) {
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std::cerr << "ERROR: Running the first " << LastToPass
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<< " passes crashed this time!\n";
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return true;
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}
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// Assuming everything was successful, we now have a valid bytecode file in
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// OutputName. Use it for "Program" Instead.
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delete Program;
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Program = ParseInputFile(Filename);
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// Delete the file now.
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removeFile(Filename);
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}
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return debugPassCrash(CrashingPass);
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}
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/// CountFunctions - return the number of non-external functions defined in the
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/// module.
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static unsigned CountFunctions(Module *M) {
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unsigned N = 0;
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for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
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if (!I->isExternal())
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++N;
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return N;
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}
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/// debugPassCrash - This method is called when the specified pass crashes on
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/// Program as input. It tries to reduce the testcase to something that still
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/// crashes, but it smaller.
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///
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bool BugDriver::debugPassCrash(const PassInfo *Pass) {
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EmitProgressBytecode(Pass, "passinput");
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if (CountFunctions(Program) > 1) {
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// Attempt to reduce the input program down to a single function that still
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// crashes. Do this by removing everything except for that one function...
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//
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std::cout << "\n*** Attempting to reduce the testcase to one function\n";
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for (Module::iterator I = Program->begin(), E = Program->end(); I != E; ++I)
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if (!I->isExternal()) {
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// Extract one function from the module...
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Module *M = extractFunctionFromModule(I);
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// Make the function the current program...
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std::swap(Program, M);
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// Find out if the pass still crashes on this pass...
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std::cout << "Checking function '" << I->getName() << "': ";
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if (runPass(Pass)) {
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// Yup, it does, we delete the old module, and continue trying to
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// reduce the testcase...
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delete M;
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EmitProgressBytecode(Pass, "reduced-"+I->getName());
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break;
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}
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// This pass didn't crash on this function, try the next one.
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delete Program;
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Program = M;
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}
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}
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if (CountFunctions(Program) > 1) {
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std::cout << "\n*** Couldn't reduce testcase to one function.\n"
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<< " Attempting to remove individual functions.\n";
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std::cout << "XXX Individual function removal unimplemented!\n";
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}
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// Now that we have deleted the functions that are unneccesary for the
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// program, try to remove instructions and basic blocks that are not neccesary
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// to cause the crash.
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//
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return false;
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}
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