It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/bugpoint/OptimizerDriver.cpp b/tools/bugpoint/OptimizerDriver.cpp
new file mode 100644
index 0000000..a3ce42e
--- /dev/null
+++ b/tools/bugpoint/OptimizerDriver.cpp
@@ -0,0 +1,254 @@
+//===- OptimizerDriver.cpp - Allow BugPoint to run passes safely ----------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an interface that allows bugpoint to run various passes
+// without the threat of a buggy pass corrupting bugpoint (of course, bugpoint
+// may have its own bugs, but that's another story...). It achieves this by
+// forking a copy of itself and having the child process do the optimizations.
+// If this client dies, we can always fork a new one. :)
+//
+//===----------------------------------------------------------------------===//
+
+// Note: as a short term hack, the old Unix-specific code and platform-
+// independent code co-exist via conditional compilation until it is verified
+// that the new code works correctly on Unix.
+
+#include "BugDriver.h"
+#include "llvm/Module.h"
+#include "llvm/PassManager.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/System/Path.h"
+#include "llvm/System/Program.h"
+#include "llvm/Config/alloca.h"
+
+#define DONT_GET_PLUGIN_LOADER_OPTION
+#include "llvm/Support/PluginLoader.h"
+
+#include <fstream>
+using namespace llvm;
+
+
+namespace {
+ // ChildOutput - This option captures the name of the child output file that
+ // is set up by the parent bugpoint process
+ cl::opt<std::string> ChildOutput("child-output", cl::ReallyHidden);
+ cl::opt<bool> UseValgrind("enable-valgrind",
+ cl::desc("Run optimizations through valgrind"));
+}
+
+/// writeProgramToFile - This writes the current "Program" to the named bitcode
+/// file. If an error occurs, true is returned.
+///
+bool BugDriver::writeProgramToFile(const std::string &Filename,
+ Module *M) const {
+ std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
+ std::ios::binary;
+ std::ofstream Out(Filename.c_str(), io_mode);
+ if (!Out.good()) return true;
+
+ WriteBitcodeToFile(M ? M : Program, Out);
+ return false;
+}
+
+
+/// EmitProgressBitcode - This function is used to output the current Program
+/// to a file named "bugpoint-ID.bc".
+///
+void BugDriver::EmitProgressBitcode(const std::string &ID, bool NoFlyer) {
+ // Output the input to the current pass to a bitcode file, emit a message
+ // telling the user how to reproduce it: opt -foo blah.bc
+ //
+ std::string Filename = "bugpoint-" + ID + ".bc";
+ if (writeProgramToFile(Filename)) {
+ cerr << "Error opening file '" << Filename << "' for writing!\n";
+ return;
+ }
+
+ cout << "Emitted bitcode to '" << Filename << "'\n";
+ if (NoFlyer || PassesToRun.empty()) return;
+ cout << "\n*** You can reproduce the problem with: ";
+ cout << "opt " << Filename << " ";
+ cout << getPassesString(PassesToRun) << "\n";
+}
+
+int BugDriver::runPassesAsChild(const std::vector<const PassInfo*> &Passes) {
+
+ std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
+ std::ios::binary;
+ std::ofstream OutFile(ChildOutput.c_str(), io_mode);
+ if (!OutFile.good()) {
+ cerr << "Error opening bitcode file: " << ChildOutput << "\n";
+ return 1;
+ }
+
+ PassManager PM;
+ // Make sure that the appropriate target data is always used...
+ PM.add(new TargetData(Program));
+
+ for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
+ if (Passes[i]->getNormalCtor())
+ PM.add(Passes[i]->getNormalCtor()());
+ else
+ cerr << "Cannot create pass yet: " << Passes[i]->getPassName() << "\n";
+ }
+ // Check that the module is well formed on completion of optimization
+ PM.add(createVerifierPass());
+
+ // Write bitcode out to disk as the last step...
+ PM.add(CreateBitcodeWriterPass(OutFile));
+
+ // Run all queued passes.
+ PM.run(*Program);
+
+ return 0;
+}
+
+/// runPasses - Run the specified passes on Program, outputting a bitcode file
+/// and writing the filename into OutputFile if successful. If the
+/// optimizations fail for some reason (optimizer crashes), return true,
+/// otherwise return false. If DeleteOutput is set to true, the bitcode is
+/// deleted on success, and the filename string is undefined. This prints to
+/// cout a single line message indicating whether compilation was successful or
+/// failed.
+///
+bool BugDriver::runPasses(const std::vector<const PassInfo*> &Passes,
+ std::string &OutputFilename, bool DeleteOutput,
+ bool Quiet) const {
+ // setup the output file name
+ cout << std::flush;
+ sys::Path uniqueFilename("bugpoint-output.bc");
+ std::string ErrMsg;
+ if (uniqueFilename.makeUnique(true, &ErrMsg)) {
+ cerr << getToolName() << ": Error making unique filename: "
+ << ErrMsg << "\n";
+ return(1);
+ }
+ OutputFilename = uniqueFilename.toString();
+
+ // set up the input file name
+ sys::Path inputFilename("bugpoint-input.bc");
+ if (inputFilename.makeUnique(true, &ErrMsg)) {
+ cerr << getToolName() << ": Error making unique filename: "
+ << ErrMsg << "\n";
+ return(1);
+ }
+ std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
+ std::ios::binary;
+ std::ofstream InFile(inputFilename.c_str(), io_mode);
+ if (!InFile.good()) {
+ cerr << "Error opening bitcode file: " << inputFilename << "\n";
+ return(1);
+ }
+ WriteBitcodeToFile(Program, InFile);
+ InFile.close();
+
+ // setup the child process' arguments
+ const char** args = (const char**)
+ alloca(sizeof(const char*) *
+ (Passes.size()+13+2*PluginLoader::getNumPlugins()));
+ int n = 0;
+ sys::Path tool = sys::Program::FindProgramByName(ToolName);
+ if (UseValgrind) {
+ args[n++] = "valgrind";
+ args[n++] = "--error-exitcode=1";
+ args[n++] = "-q";
+ args[n++] = tool.c_str();
+ } else
+ args[n++] = ToolName.c_str();
+
+ args[n++] = "-as-child";
+ args[n++] = "-child-output";
+ args[n++] = OutputFilename.c_str();
+ std::vector<std::string> pass_args;
+ for (unsigned i = 0, e = PluginLoader::getNumPlugins(); i != e; ++i) {
+ pass_args.push_back( std::string("-load"));
+ pass_args.push_back( PluginLoader::getPlugin(i));
+ }
+ for (std::vector<const PassInfo*>::const_iterator I = Passes.begin(),
+ E = Passes.end(); I != E; ++I )
+ pass_args.push_back( std::string("-") + (*I)->getPassArgument() );
+ for (std::vector<std::string>::const_iterator I = pass_args.begin(),
+ E = pass_args.end(); I != E; ++I )
+ args[n++] = I->c_str();
+ args[n++] = inputFilename.c_str();
+ args[n++] = 0;
+
+ sys::Path prog;
+ if (UseValgrind)
+ prog = sys::Program::FindProgramByName("valgrind");
+ else
+ prog = tool;
+ int result = sys::Program::ExecuteAndWait(prog, args, 0, 0,
+ Timeout, MemoryLimit, &ErrMsg);
+
+ // If we are supposed to delete the bitcode file or if the passes crashed,
+ // remove it now. This may fail if the file was never created, but that's ok.
+ if (DeleteOutput || result != 0)
+ sys::Path(OutputFilename).eraseFromDisk();
+
+ // Remove the temporary input file as well
+ inputFilename.eraseFromDisk();
+
+ if (!Quiet) {
+ if (result == 0)
+ cout << "Success!\n";
+ else if (result > 0)
+ cout << "Exited with error code '" << result << "'\n";
+ else if (result < 0) {
+ if (result == -1)
+ cout << "Execute failed: " << ErrMsg << "\n";
+ else
+ cout << "Crashed with signal #" << abs(result) << "\n";
+ }
+ if (result & 0x01000000)
+ cout << "Dumped core\n";
+ }
+
+ // Was the child successful?
+ return result != 0;
+}
+
+
+/// runPassesOn - Carefully run the specified set of pass on the specified
+/// module, returning the transformed module on success, or a null pointer on
+/// failure.
+Module *BugDriver::runPassesOn(Module *M,
+ const std::vector<const PassInfo*> &Passes,
+ bool AutoDebugCrashes) {
+ Module *OldProgram = swapProgramIn(M);
+ std::string BitcodeResult;
+ if (runPasses(Passes, BitcodeResult, false/*delete*/, true/*quiet*/)) {
+ if (AutoDebugCrashes) {
+ cerr << " Error running this sequence of passes"
+ << " on the input program!\n";
+ delete OldProgram;
+ EmitProgressBitcode("pass-error", false);
+ exit(debugOptimizerCrash());
+ }
+ swapProgramIn(OldProgram);
+ return 0;
+ }
+
+ // Restore the current program.
+ swapProgramIn(OldProgram);
+
+ Module *Ret = ParseInputFile(BitcodeResult);
+ if (Ret == 0) {
+ cerr << getToolName() << ": Error reading bitcode file '"
+ << BitcodeResult << "'!\n";
+ exit(1);
+ }
+ sys::Path(BitcodeResult).eraseFromDisk(); // No longer need the file on disk
+ return Ret;
+}