forked from OSchip/llvm-project
473 lines
17 KiB
C++
473 lines
17 KiB
C++
//===- ExecutionDriver.cpp - Allow execution of LLVM program --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains code used to execute the program utilizing one of the
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// various ways of running LLVM bitcode.
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//
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//===----------------------------------------------------------------------===//
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#include "BugDriver.h"
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#include "ToolRunner.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/Support/SystemUtils.h"
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#include <fstream>
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using namespace llvm;
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namespace {
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// OutputType - Allow the user to specify the way code should be run, to test
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// for miscompilation.
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//
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enum OutputType {
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AutoPick, RunLLI, RunJIT, RunLLC, RunCBE, CBE_bug, LLC_Safe, Custom
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};
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cl::opt<double>
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AbsTolerance("abs-tolerance", cl::desc("Absolute error tolerated"),
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cl::init(0.0));
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cl::opt<double>
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RelTolerance("rel-tolerance", cl::desc("Relative error tolerated"),
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cl::init(0.0));
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cl::opt<OutputType>
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InterpreterSel(cl::desc("Specify the \"test\" i.e. suspect back-end:"),
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cl::values(clEnumValN(AutoPick, "auto", "Use best guess"),
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clEnumValN(RunLLI, "run-int",
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"Execute with the interpreter"),
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clEnumValN(RunJIT, "run-jit", "Execute with JIT"),
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clEnumValN(RunLLC, "run-llc", "Compile with LLC"),
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clEnumValN(RunCBE, "run-cbe", "Compile with CBE"),
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clEnumValN(CBE_bug,"cbe-bug", "Find CBE bugs"),
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clEnumValN(LLC_Safe, "llc-safe", "Use LLC for all"),
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clEnumValN(Custom, "run-custom",
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"Use -exec-command to define a command to execute "
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"the bitcode. Useful for cross-compilation."),
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clEnumValEnd),
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cl::init(AutoPick));
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cl::opt<OutputType>
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SafeInterpreterSel(cl::desc("Specify \"safe\" i.e. known-good backend:"),
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cl::values(clEnumValN(AutoPick, "safe-auto", "Use best guess"),
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clEnumValN(RunLLC, "safe-run-llc", "Compile with LLC"),
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clEnumValN(RunCBE, "safe-run-cbe", "Compile with CBE"),
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clEnumValN(Custom, "safe-run-custom",
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"Use -exec-command to define a command to execute "
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"the bitcode. Useful for cross-compilation."),
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clEnumValEnd),
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cl::init(AutoPick));
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cl::opt<std::string>
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SafeInterpreterPath("safe-path",
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cl::desc("Specify the path to the \"safe\" backend program"),
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cl::init(""));
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cl::opt<bool>
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AppendProgramExitCode("append-exit-code",
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cl::desc("Append the exit code to the output so it gets diff'd too"),
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cl::init(false));
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cl::opt<std::string>
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InputFile("input", cl::init("/dev/null"),
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cl::desc("Filename to pipe in as stdin (default: /dev/null)"));
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cl::list<std::string>
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AdditionalSOs("additional-so",
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cl::desc("Additional shared objects to load "
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"into executing programs"));
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cl::list<std::string>
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AdditionalLinkerArgs("Xlinker",
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cl::desc("Additional arguments to pass to the linker"));
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cl::opt<std::string>
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CustomExecCommand("exec-command", cl::init("simulate"),
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cl::desc("Command to execute the bitcode (use with -run-custom) "
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"(default: simulate)"));
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}
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namespace llvm {
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// Anything specified after the --args option are taken as arguments to the
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// program being debugged.
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cl::list<std::string>
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InputArgv("args", cl::Positional, cl::desc("<program arguments>..."),
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cl::ZeroOrMore, cl::PositionalEatsArgs);
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}
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namespace {
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cl::list<std::string>
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ToolArgv("tool-args", cl::Positional, cl::desc("<tool arguments>..."),
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cl::ZeroOrMore, cl::PositionalEatsArgs);
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cl::list<std::string>
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SafeToolArgv("safe-tool-args", cl::Positional,
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cl::desc("<safe-tool arguments>..."),
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cl::ZeroOrMore, cl::PositionalEatsArgs);
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cl::list<std::string>
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GCCToolArgv("gcc-tool-args", cl::Positional,
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cl::desc("<gcc-tool arguments>..."),
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cl::ZeroOrMore, cl::PositionalEatsArgs);
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}
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//===----------------------------------------------------------------------===//
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// BugDriver method implementation
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//
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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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bool BugDriver::initializeExecutionEnvironment() {
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outs() << "Initializing execution environment: ";
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// Create an instance of the AbstractInterpreter interface as specified on
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// the command line
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SafeInterpreter = 0;
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std::string Message;
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switch (InterpreterSel) {
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case AutoPick:
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InterpreterSel = RunCBE;
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Interpreter =
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AbstractInterpreter::createCBE(getToolName(), Message, &ToolArgv,
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&GCCToolArgv);
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if (!Interpreter) {
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InterpreterSel = RunJIT;
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Interpreter = AbstractInterpreter::createJIT(getToolName(), Message,
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&ToolArgv);
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}
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if (!Interpreter) {
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InterpreterSel = RunLLC;
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Interpreter = AbstractInterpreter::createLLC(getToolName(), Message,
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&ToolArgv, &GCCToolArgv);
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}
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if (!Interpreter) {
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InterpreterSel = RunLLI;
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Interpreter = AbstractInterpreter::createLLI(getToolName(), Message,
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&ToolArgv);
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}
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if (!Interpreter) {
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InterpreterSel = AutoPick;
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Message = "Sorry, I can't automatically select an interpreter!\n";
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}
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break;
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case RunLLI:
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Interpreter = AbstractInterpreter::createLLI(getToolName(), Message,
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&ToolArgv);
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break;
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case RunLLC:
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case LLC_Safe:
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Interpreter = AbstractInterpreter::createLLC(getToolName(), Message,
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&ToolArgv, &GCCToolArgv);
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break;
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case RunJIT:
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Interpreter = AbstractInterpreter::createJIT(getToolName(), Message,
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&ToolArgv);
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break;
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case RunCBE:
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case CBE_bug:
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Interpreter = AbstractInterpreter::createCBE(getToolName(), Message,
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&ToolArgv, &GCCToolArgv);
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break;
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case Custom:
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Interpreter = AbstractInterpreter::createCustom(Message, CustomExecCommand);
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break;
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default:
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Message = "Sorry, this back-end is not supported by bugpoint right now!\n";
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break;
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}
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if (!Interpreter)
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errs() << Message;
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else // Display informational messages on stdout instead of stderr
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outs() << Message;
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std::string Path = SafeInterpreterPath;
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if (Path.empty())
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Path = getToolName();
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std::vector<std::string> SafeToolArgs = SafeToolArgv;
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switch (SafeInterpreterSel) {
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case AutoPick:
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// In "cbe-bug" mode, default to using LLC as the "safe" backend.
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if (!SafeInterpreter &&
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InterpreterSel == CBE_bug) {
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SafeInterpreterSel = RunLLC;
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SafeToolArgs.push_back("--relocation-model=pic");
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SafeInterpreter = AbstractInterpreter::createLLC(Path.c_str(), Message,
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&SafeToolArgs,
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&GCCToolArgv);
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}
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// In "llc-safe" mode, default to using LLC as the "safe" backend.
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if (!SafeInterpreter &&
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InterpreterSel == LLC_Safe) {
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SafeInterpreterSel = RunLLC;
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SafeToolArgs.push_back("--relocation-model=pic");
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SafeInterpreter = AbstractInterpreter::createLLC(Path.c_str(), Message,
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&SafeToolArgs,
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&GCCToolArgv);
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}
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// Pick a backend that's different from the test backend. The JIT and
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// LLC backends share a lot of code, so prefer to use the CBE as the
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// safe back-end when testing them.
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if (!SafeInterpreter &&
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InterpreterSel != RunCBE) {
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SafeInterpreterSel = RunCBE;
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SafeInterpreter = AbstractInterpreter::createCBE(Path.c_str(), Message,
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&SafeToolArgs,
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&GCCToolArgv);
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}
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if (!SafeInterpreter &&
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InterpreterSel != RunLLC &&
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InterpreterSel != RunJIT) {
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SafeInterpreterSel = RunLLC;
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SafeToolArgs.push_back("--relocation-model=pic");
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SafeInterpreter = AbstractInterpreter::createLLC(Path.c_str(), Message,
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&SafeToolArgs,
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&GCCToolArgv);
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}
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if (!SafeInterpreter) {
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SafeInterpreterSel = AutoPick;
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Message = "Sorry, I can't automatically select an interpreter!\n";
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}
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break;
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case RunLLC:
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SafeToolArgs.push_back("--relocation-model=pic");
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SafeInterpreter = AbstractInterpreter::createLLC(Path.c_str(), Message,
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&SafeToolArgs,
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&GCCToolArgv);
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break;
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case RunCBE:
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SafeInterpreter = AbstractInterpreter::createCBE(Path.c_str(), Message,
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&SafeToolArgs,
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&GCCToolArgv);
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break;
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case Custom:
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SafeInterpreter = AbstractInterpreter::createCustom(Message,
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CustomExecCommand);
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break;
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default:
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Message = "Sorry, this back-end is not supported by bugpoint as the "
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"\"safe\" backend right now!\n";
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break;
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}
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if (!SafeInterpreter) { outs() << Message << "\nExiting.\n"; exit(1); }
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gcc = GCC::create(Message, &GCCToolArgv);
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if (!gcc) { outs() << Message << "\nExiting.\n"; exit(1); }
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// If there was an error creating the selected interpreter, quit with error.
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return Interpreter == 0;
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}
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/// compileProgram - Try to compile the specified module, throwing an exception
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/// if an error occurs, or returning normally if not. This is used for code
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/// generation crash testing.
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///
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void BugDriver::compileProgram(Module *M) {
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// Emit the program to a bitcode file...
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sys::Path BitcodeFile ("bugpoint-test-program.bc");
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std::string ErrMsg;
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if (BitcodeFile.makeUnique(true,&ErrMsg)) {
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errs() << ToolName << ": Error making unique filename: " << ErrMsg
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<< "\n";
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exit(1);
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}
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if (writeProgramToFile(BitcodeFile.toString(), M)) {
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errs() << ToolName << ": Error emitting bitcode to file '"
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<< BitcodeFile << "'!\n";
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exit(1);
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}
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// Remove the temporary bitcode file when we are done.
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FileRemover BitcodeFileRemover(BitcodeFile, !SaveTemps);
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// Actually compile the program!
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Interpreter->compileProgram(BitcodeFile.toString());
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}
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/// executeProgram - This method runs "Program", capturing the output of the
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/// program to a file, returning the filename of the file. A recommended
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/// filename may be optionally specified.
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///
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std::string BugDriver::executeProgram(std::string OutputFile,
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std::string BitcodeFile,
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const std::string &SharedObj,
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AbstractInterpreter *AI,
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bool *ProgramExitedNonzero) {
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if (AI == 0) AI = Interpreter;
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assert(AI && "Interpreter should have been created already!");
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bool CreatedBitcode = false;
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std::string ErrMsg;
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if (BitcodeFile.empty()) {
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// Emit the program to a bitcode file...
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sys::Path uniqueFilename("bugpoint-test-program.bc");
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if (uniqueFilename.makeUnique(true, &ErrMsg)) {
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errs() << ToolName << ": Error making unique filename: "
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<< ErrMsg << "!\n";
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exit(1);
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}
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BitcodeFile = uniqueFilename.toString();
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if (writeProgramToFile(BitcodeFile, Program)) {
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errs() << ToolName << ": Error emitting bitcode to file '"
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<< BitcodeFile << "'!\n";
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exit(1);
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}
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CreatedBitcode = true;
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}
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// Remove the temporary bitcode file when we are done.
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sys::Path BitcodePath (BitcodeFile);
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FileRemover BitcodeFileRemover(BitcodePath, CreatedBitcode && !SaveTemps);
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if (OutputFile.empty()) OutputFile = "bugpoint-execution-output";
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// Check to see if this is a valid output filename...
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sys::Path uniqueFile(OutputFile);
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if (uniqueFile.makeUnique(true, &ErrMsg)) {
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errs() << ToolName << ": Error making unique filename: "
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<< ErrMsg << "\n";
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exit(1);
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}
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OutputFile = uniqueFile.toString();
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// Figure out which shared objects to run, if any.
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std::vector<std::string> SharedObjs(AdditionalSOs);
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if (!SharedObj.empty())
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SharedObjs.push_back(SharedObj);
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int RetVal = AI->ExecuteProgram(BitcodeFile, InputArgv, InputFile,
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OutputFile, AdditionalLinkerArgs, SharedObjs,
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Timeout, MemoryLimit);
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if (RetVal == -1) {
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errs() << "<timeout>";
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static bool FirstTimeout = true;
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if (FirstTimeout) {
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outs() << "\n"
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"*** Program execution timed out! This mechanism is designed to handle\n"
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" programs stuck in infinite loops gracefully. The -timeout option\n"
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" can be used to change the timeout threshold or disable it completely\n"
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" (with -timeout=0). This message is only displayed once.\n";
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FirstTimeout = false;
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}
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}
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if (AppendProgramExitCode) {
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std::ofstream outFile(OutputFile.c_str(), std::ios_base::app);
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outFile << "exit " << RetVal << '\n';
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outFile.close();
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}
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if (ProgramExitedNonzero != 0)
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*ProgramExitedNonzero = (RetVal != 0);
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// Return the filename we captured the output to.
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return OutputFile;
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}
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/// executeProgramSafely - Used to create reference output with the "safe"
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/// backend, if reference output is not provided.
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///
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std::string BugDriver::executeProgramSafely(std::string OutputFile) {
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bool ProgramExitedNonzero;
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std::string outFN = executeProgram(OutputFile, "", "", SafeInterpreter,
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&ProgramExitedNonzero);
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return outFN;
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}
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std::string BugDriver::compileSharedObject(const std::string &BitcodeFile) {
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assert(Interpreter && "Interpreter should have been created already!");
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sys::Path OutputFile;
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// Using the known-good backend.
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GCC::FileType FT = SafeInterpreter->OutputCode(BitcodeFile, OutputFile);
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std::string SharedObjectFile;
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if (gcc->MakeSharedObject(OutputFile.toString(), FT,
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SharedObjectFile, AdditionalLinkerArgs))
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exit(1);
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// Remove the intermediate C file
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OutputFile.eraseFromDisk();
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return "./" + SharedObjectFile;
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}
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/// createReferenceFile - calls compileProgram and then records the output
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/// into ReferenceOutputFile. Returns true if reference file created, false
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/// otherwise. Note: initializeExecutionEnvironment should be called BEFORE
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/// this function.
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///
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bool BugDriver::createReferenceFile(Module *M, const std::string &Filename) {
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try {
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compileProgram(Program);
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} catch (ToolExecutionError &) {
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return false;
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}
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try {
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ReferenceOutputFile = executeProgramSafely(Filename);
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outs() << "\nReference output is: " << ReferenceOutputFile << "\n\n";
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} catch (ToolExecutionError &TEE) {
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errs() << TEE.what();
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if (Interpreter != SafeInterpreter) {
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errs() << "*** There is a bug running the \"safe\" backend. Either"
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<< " debug it (for example with the -run-cbe bugpoint option,"
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<< " if CBE is being used as the \"safe\" backend), or fix the"
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<< " error some other way.\n";
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}
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return false;
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}
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return true;
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}
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/// diffProgram - This method executes the specified module and diffs the
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/// output against the file specified by ReferenceOutputFile. If the output
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/// is different, true is returned. If there is a problem with the code
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/// generator (e.g., llc crashes), this will throw an exception.
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///
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bool BugDriver::diffProgram(const std::string &BitcodeFile,
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const std::string &SharedObject,
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bool RemoveBitcode) {
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bool ProgramExitedNonzero;
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// Execute the program, generating an output file...
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sys::Path Output(executeProgram("", BitcodeFile, SharedObject, 0,
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&ProgramExitedNonzero));
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std::string Error;
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bool FilesDifferent = false;
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if (int Diff = DiffFilesWithTolerance(sys::Path(ReferenceOutputFile),
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sys::Path(Output.toString()),
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AbsTolerance, RelTolerance, &Error)) {
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if (Diff == 2) {
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errs() << "While diffing output: " << Error << '\n';
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exit(1);
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}
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FilesDifferent = true;
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}
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else {
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// Remove the generated output if there are no differences.
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Output.eraseFromDisk();
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}
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// Remove the bitcode file if we are supposed to.
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if (RemoveBitcode)
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sys::Path(BitcodeFile).eraseFromDisk();
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return FilesDifferent;
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}
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bool BugDriver::isExecutingJIT() {
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return InterpreterSel == RunJIT;
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}
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