Initial checkin of bugpoint
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4789 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/bugpoint/CrashDebugger.cpp b/tools/bugpoint/CrashDebugger.cpp
new file mode 100644
index 0000000..3c4fa2d
--- /dev/null
+++ b/tools/bugpoint/CrashDebugger.cpp
@@ -0,0 +1,120 @@
+//===- CrashDebugger.cpp - Debug compilation crashes ----------------------===//
+//
+// This file defines the bugpoint internals that narrow down compilation crashes
+//
+//===----------------------------------------------------------------------===//
+
+#include "BugDriver.h"
+#include "llvm/Module.h"
+#include "llvm/Bytecode/Writer.h"
+#include "llvm/Pass.h"
+#include <fstream>
+
+/// debugCrash - This method is called when some pass crashes on input. It
+/// attempts to prune down the testcase to something reasonable, and figure
+/// out exactly which pass is crashing.
+///
+bool BugDriver::debugCrash() {
+ std::cout << "\n*** Debugging optimizer crash!\n";
+
+ // Determine which pass causes the optimizer to crash... using binary search
+ unsigned LastToPass = 0, LastToCrash = PassesToRun.size();
+ while (LastToPass != LastToCrash) {
+ unsigned Mid = (LastToCrash+LastToPass+1) / 2;
+ std::vector<const PassInfo*> P(PassesToRun.begin(),
+ PassesToRun.begin()+Mid);
+ std::cout << "Checking to see if the first " << Mid << " passes crash: ";
+
+ if (runPasses(P))
+ LastToCrash = Mid-1;
+ else
+ LastToPass = Mid;
+ }
+
+ // Make sure something crashed. :)
+ if (LastToCrash >= PassesToRun.size()) {
+ std::cerr << "ERROR: No passes crashed!\n";
+ return true;
+ }
+
+ // Calculate which pass it is that crashes...
+ const PassInfo *CrashingPass = PassesToRun[LastToCrash];
+
+ std::cout << "\n*** Found crashing pass '-" << CrashingPass->getPassArgument()
+ << "': " << CrashingPass->getPassName() << "\n";
+
+ // Compile the program with just the passes that don't crash.
+ if (LastToPass != 0) {
+ // Don't bother doing this if the first pass crashes...
+ std::vector<const PassInfo*> P(PassesToRun.begin(),
+ PassesToRun.begin()+LastToPass);
+ std::string Filename;
+ std::cout << "Running passes that don't crash to get input for pass: ";
+ if (runPasses(P, Filename)) {
+ std::cerr << "ERROR: Running the first " << LastToPass
+ << " passes crashed this time!\n";
+ return true;
+ }
+
+ // Assuming everything was successful, we now have a valid bytecode file in
+ // OutputName. Use it for "Program" Instead.
+ delete Program;
+ Program = ParseInputFile(Filename);
+
+ // Delete the file now.
+ removeFile(Filename);
+ }
+
+ return debugPassCrash(CrashingPass);
+}
+
+/// CountFunctions - return the number of non-external functions defined in the
+/// module.
+static unsigned CountFunctions(Module *M) {
+ unsigned N = 0;
+ for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
+ if (!I->isExternal())
+ ++N;
+ return N;
+}
+
+/// debugPassCrash - This method is called when the specified pass crashes on
+/// Program as input. It tries to reduce the testcase to something that still
+/// crashes, but it smaller.
+///
+bool BugDriver::debugPassCrash(const PassInfo *Pass) {
+ EmitProgressBytecode(Pass, "passinput");
+
+ if (CountFunctions(Program) > 1) {
+ // Attempt to reduce the input program down to a single function that still
+ // crashes.
+ //
+ std::cout << "\n*** Attempting to reduce the testcase to one function\n";
+
+ for (Module::iterator I = Program->begin(), E = Program->end(); I != E; ++I)
+ if (!I->isExternal()) {
+ // Extract one function from the module...
+ Module *M = extractFunctionFromModule(I);
+
+ // Make the function the current program...
+ std::swap(Program, M);
+
+ // Find out if the pass still crashes on this pass...
+ std::cout << "Checking function '" << I->getName() << "': ";
+ if (runPass(Pass)) {
+ // Yup, it does, we delete the old module, and continue trying to
+ // reduce the testcase...
+ delete M;
+
+ EmitProgressBytecode(Pass, "reduced-"+I->getName());
+ break;
+ }
+
+ // This pass didn't crash on this function, try the next one.
+ delete Program;
+ Program = M;
+ }
+ }
+
+ return false;
+}