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//===- bugpoint.cpp - The LLVM Bugpoint utility ---------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This program is an automated compiler debugger tool. It is used to narrow
// down miscompilations and crash problems to a specific pass in the compiler,
// and the specific Module or Function input that is causing the problem.
//
//===----------------------------------------------------------------------===//
#include "BugDriver.h"
#include "ToolRunner.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/LegacyPassNameParser.h"
#include "llvm/InitializePasses.h"
#include "llvm/LinkAllIR.h"
#include "llvm/LinkAllPasses.h"
#include "llvm/Passes/PassPlugin.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/PluginLoader.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/Valgrind.h"
#include "llvm/Transforms/IPO/AlwaysInliner.h"
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
// Enable this macro to debug bugpoint itself.
//#define DEBUG_BUGPOINT 1
using namespace llvm;
static cl::opt<bool>
FindBugs("find-bugs", cl::desc("Run many different optimization sequences "
"on program to find bugs"),
cl::init(false));
static cl::list<std::string>
InputFilenames(cl::Positional, cl::OneOrMore,
cl::desc("<input llvm ll/bc files>"));
static cl::opt<unsigned> TimeoutValue(
"timeout", cl::init(300), cl::value_desc("seconds"),
cl::desc("Number of seconds program is allowed to run before it "
"is killed (default is 300s), 0 disables timeout"));
static cl::opt<int> MemoryLimit(
"mlimit", cl::init(-1), cl::value_desc("MBytes"),
cl::desc("Maximum amount of memory to use. 0 disables check. Defaults to "
"400MB (800MB under valgrind, 0 with sanitizers)."));
static cl::opt<bool>
UseValgrind("enable-valgrind",
cl::desc("Run optimizations through valgrind"));
// The AnalysesList is automatically populated with registered Passes by the
// PassNameParser.
//
static cl::list<const PassInfo *, bool, PassNameParser>
PassList(cl::desc("Passes available:"));
static cl::opt<bool>
OptLevelO1("O1", cl::desc("Optimization level 1. Identical to 'opt -O1'"));
static cl::opt<bool>
OptLevelO2("O2", cl::desc("Optimization level 2. Identical to 'opt -O2'"));
static cl::opt<bool> OptLevelOs(
"Os",
cl::desc(
"Like -O2 with extra optimizations for size. Similar to clang -Os"));
static cl::opt<bool>
OptLevelOz("Oz",
cl::desc("Like -Os but reduces code size further. Similar to clang -Oz"));
static cl::opt<bool>
OptLevelO3("O3", cl::desc("Optimization level 3. Identical to 'opt -O3'"));
static cl::opt<std::string>
OverrideTriple("mtriple", cl::desc("Override target triple for module"));
/// BugpointIsInterrupted - Set to true when the user presses ctrl-c.
bool llvm::BugpointIsInterrupted = false;
#ifndef DEBUG_BUGPOINT
static void BugpointInterruptFunction() { BugpointIsInterrupted = true; }
#endif
// Hack to capture a pass list.
namespace {
class AddToDriver : public legacy::FunctionPassManager {
BugDriver &D;
public:
AddToDriver(BugDriver &_D) : FunctionPassManager(nullptr), D(_D) {}
void add(Pass *P) override {
const void *ID = P->getPassID();
const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID);
D.addPass(std::string(PI->getPassArgument()));
}
};
}
// This routine adds optimization passes based on selected optimization level,
// OptLevel.
//
// OptLevel - Optimization Level
static void AddOptimizationPasses(legacy::FunctionPassManager &FPM,
unsigned OptLevel,
unsigned SizeLevel) {
PassManagerBuilder Builder;
Builder.OptLevel = OptLevel;
Builder.SizeLevel = SizeLevel;
if (OptLevel > 1)
Builder.Inliner = createFunctionInliningPass(OptLevel, SizeLevel, false);
else
Builder.Inliner = createAlwaysInlinerLegacyPass();
Builder.populateFunctionPassManager(FPM);
Builder.populateModulePassManager(FPM);
}
#define HANDLE_EXTENSION(Ext) \
llvm::PassPluginLibraryInfo get##Ext##PluginInfo();
#include "llvm/Support/Extension.def"
int main(int argc, char **argv) {
#ifndef DEBUG_BUGPOINT
InitLLVM X(argc, argv);
#endif
// Initialize passes
PassRegistry &Registry = *PassRegistry::getPassRegistry();
initializeCore(Registry);
initializeScalarOpts(Registry);
initializeVectorization(Registry);
initializeIPO(Registry);
initializeAnalysis(Registry);
initializeTransformUtils(Registry);
initializeInstCombine(Registry);
initializeTarget(Registry);
if (std::getenv("bar") == (char*) -1) {
InitializeAllTargets();
InitializeAllTargetMCs();
InitializeAllAsmPrinters();
InitializeAllAsmParsers();
}
cl::ParseCommandLineOptions(argc, argv,
"LLVM automatic testcase reducer. See\nhttp://"
"llvm.org/cmds/bugpoint.html"
" for more information.\n");
#ifndef DEBUG_BUGPOINT
sys::SetInterruptFunction(BugpointInterruptFunction);
#endif
LLVMContext Context;
// If we have an override, set it and then track the triple we want Modules
// to use.
if (!OverrideTriple.empty()) {
TargetTriple.setTriple(Triple::normalize(OverrideTriple));
outs() << "Override triple set to '" << TargetTriple.getTriple() << "'\n";
}
if (MemoryLimit < 0) {
// Set the default MemoryLimit. Be sure to update the flag's description if
// you change this.
if (sys::RunningOnValgrind() || UseValgrind)
MemoryLimit = 800;
else
MemoryLimit = 400;
#if (LLVM_ADDRESS_SANITIZER_BUILD || LLVM_MEMORY_SANITIZER_BUILD || \
LLVM_THREAD_SANITIZER_BUILD)
// Starting from kernel 4.9 memory allocated with mmap is counted against
// RLIMIT_DATA. Sanitizers need to allocate tens of terabytes for shadow.
MemoryLimit = 0;
#endif
}
BugDriver D(argv[0], FindBugs, TimeoutValue, MemoryLimit, UseValgrind,
Context);
if (D.addSources(InputFilenames))
return 1;
AddToDriver PM(D);
if (OptLevelO1)
AddOptimizationPasses(PM, 1, 0);
else if (OptLevelO2)
AddOptimizationPasses(PM, 2, 0);
else if (OptLevelO3)
AddOptimizationPasses(PM, 3, 0);
else if (OptLevelOs)
AddOptimizationPasses(PM, 2, 1);
else if (OptLevelOz)
AddOptimizationPasses(PM, 2, 2);
for (const PassInfo *PI : PassList)
D.addPass(std::string(PI->getPassArgument()));
// Bugpoint has the ability of generating a plethora of core files, so to
// avoid filling up the disk, we prevent it
#ifndef DEBUG_BUGPOINT
sys::Process::PreventCoreFiles();
#endif
// Needed to pull in symbols from statically linked extensions, including static
// registration. It is unused otherwise because bugpoint has no support for
// NewPM.
#define HANDLE_EXTENSION(Ext) \
(void)get##Ext##PluginInfo();
#include "llvm/Support/Extension.def"
if (Error E = D.run()) {
errs() << toString(std::move(E));
return 1;
}
return 0;
}
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