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BugDriver.h:

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* Added method to query if BugDriver is executing the JIT currently.
  This provides the ability in adding code that is conditionally executed in
  codegen debugging phase.

CodeGeneratorBug.cpp:
* Delete test functions from the Safe module
* Code conditionally added when debugging the JIT:
  use the lazy resolver function added to Emitter.cpp to get function pointer
  by name. When compiled into an .so, this is the only way to get a pointer to
  an external function
* Added a symbol disambiguator which will keep symbols uniquely named across
  modules
* Delete generated files by default
* The function `main' *must* stay in the .bc file for the JIT, but that prevents
  debugging it alone. This patch makes the old `main' become `old_main' and adds
  a new function named `main' which just calls the original with the same
  parameters, thereby keeping functionality the same.

ExecutionDriver.cpp:
* Returned to getting unique filenames
* Simplified code choosing between using and not using shared library option


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7364 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2003-07-28 19:16:14 +00:00
parent d69c1e6dc2
commit 91eabc13d3
3 changed files with 235 additions and 43 deletions
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3
tools/bugpoint/BugDriver.h
View File

@ -81,7 +81,6 @@ public:
bool debugPassMiscompilation(const PassInfo *ThePass,
const std::string &ReferenceOutput);
/// compileSharedObject - This method creates a SharedObject from a given
/// BytecodeFile for debugging a code generator.
int compileSharedObject(const std::string &BytecodeFile,
@ -92,6 +91,8 @@ public:
/// functions that are not under consideration.
bool debugCodeGenerator();
bool isExecutingJIT();
private:
/// ParseInputFile - Given a bytecode or assembly input filename, parse and
/// return it, or return null if not possible.

216
tools/bugpoint/CodeGeneratorBug.cpp
View File

@ -7,11 +7,18 @@
#include "BugDriver.h"
#include "SystemUtils.h"
#include "ListReducer.h"
#include "llvm/Pass.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/GlobalValue.h"
#include "llvm/iMemory.h"
#include "llvm/iTerminators.h"
#include "llvm/iOther.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/Transforms/Utils/Linker.h"
#include "Support/CommandLine.h"
#include "Support/Statistic.h"
#include "Support/StringExtras.h"
#include <algorithm>
@ -31,14 +38,21 @@ public:
return NoFailure;
}
bool TestFuncs(const std::vector<Function*> &CodegenTest);
bool TestFuncs(const std::vector<Function*> &CodegenTest,
bool KeepFiles = false);
void DisambiguateGlobalSymbols(Module *M);
};
bool ReduceMisCodegenFunctions::TestFuncs(const std::vector<Function*> &Funcs)
bool ReduceMisCodegenFunctions::TestFuncs(const std::vector<Function*> &Funcs,
bool KeepFiles)
{
DEBUG(std::cerr << "Test functions are:\n");
for (std::vector<Function*>::const_iterator I = Funcs.begin(),E = Funcs.end();
I != E; ++I)
DEBUG(std::cerr << "\t" << (*I)->getName() << "\n");
// Clone the module for the two halves of the program we want.
Module *SafeModule = CloneModule(BD.Program);
@ -64,8 +78,114 @@ bool ReduceMisCodegenFunctions::TestFuncs(const std::vector<Function*> &Funcs)
DeleteFunctionBody(TNOF); // Function is now external in this module!
}
// Remove the Safe functions from the Test module
for (Module::iterator I=TestModule->begin(),E=TestModule->end(); I!=E; ++I) {
bool funcFound = false;
for (std::vector<Function*>::const_iterator F=Funcs.begin(),Fe=Funcs.end();
F != Fe; ++F)
if (I->getName() == (*F)->getName()) funcFound = true;
if (!funcFound && !(BD.isExecutingJIT() && I->getName() == "main"))
DeleteFunctionBody(I);
}
// This is only applicable if we are debugging the JIT:
// Find all external functions in the Safe modules that are actually used
// (called or taken address of), and make them call the JIT wrapper instead
if (BD.isExecutingJIT()) {
// Must delete `main' from Safe module if it has it
for (Module::iterator I=SafeModule->begin(), E=SafeModule->end();I!=E;++I)
if (I->getName() == "main") DeleteFunctionBody(I);
// Add an external function "getPointerToNamedFunction" that JIT provides
// Prototype: void *getPointerToNamedFunction(const char* Name)
std::vector<const Type*> Params;
Params.push_back(PointerType::get(Type::SByteTy)); // std::string&
FunctionType *resolverTy = FunctionType::get(PointerType::get(Type::VoidTy),
Params, false /* isVarArg */);
const std::string ResolverFunctionName = "getPointerToNamedFunction";
Function *resolverFunc = new Function(resolverTy,
GlobalValue::ExternalLinkage,
ResolverFunctionName,
SafeModule);
// Use the function we just added to get addresses of functions we need
// Iterate over the global declarations in the Safe module
for (Module::iterator F=SafeModule->begin(),E=SafeModule->end(); F!=E; ++F){
if (F->isExternal() && F->use_begin() != F->use_end() &&
F->getName() != ResolverFunctionName) {
// If it has a non-zero use list,
// 1. Add a string constant with its name to the global file
// The correct type is `const [ NUM x sbyte ]' where NUM is length of
// function name + 1
const std::string &Name = F->getName();
GlobalVariable *funcName =
new GlobalVariable(ArrayType::get(Type::SByteTy, Name.length()+1),
true /* isConstant */,
GlobalValue::InternalLinkage,
ConstantArray::get(Name),
Name + "_name",
SafeModule);
// 2. Use `GetElementPtr *funcName, 0, 0' to convert the string to an
// sbyte* so it matches the signature of the resolver function.
Constant *Zero = Constant::getNullValue(Type::LongTy);
std::vector<Constant*> GEPargs;
GEPargs.push_back(Zero);
GEPargs.push_back(Zero);
// 3. Replace all uses of `func' with calls to resolver by:
// (a) Iterating through the list of uses of this function
// (b) Insert a cast instruction in front of each use
// (c) Replace use of old call with new call
// Insert code at the beginning of the function
for (Value::use_iterator i=F->use_begin(), e=F->use_end(); i!=e; ++i) {
if (Instruction* Inst = dyn_cast<Instruction>(*i)) {
// GetElementPtr *funcName, ulong 0, ulong 0
Value *GEP =
ConstantExpr::getGetElementPtr(ConstantPointerRef::get(funcName),
GEPargs);
std::vector<Value*> ResolverArgs;
ResolverArgs.push_back(GEP);
// call resolver(GetElementPtr...)
CallInst *resolve = new CallInst(resolverFunc, ResolverArgs,
"resolver", Inst);
// cast the result from the resolver to correctly-typed function
CastInst *castResolver =
new CastInst(resolve, PointerType::get(F->getFunctionType()),
"", Inst);
// actually use the resolved function
Inst->replaceUsesOfWith(F, castResolver);
//BasicBlock::iterator ii(Inst);
//ReplaceInstWithValue(Inst->getParent()->getInstList(),
// ii, ResolverResult);
}
}
}
}
}
DEBUG(std::cerr << "Safe module:\n");
for (Module::iterator I = SafeModule->begin(), E = SafeModule->end();I!=E;++I)
if (!I->isExternal()) DEBUG(std::cerr << "\t" << I->getName() << "\n");
for (Module::giterator I=SafeModule->gbegin(),E = SafeModule->gend();I!=E;++I)
if (!I->isExternal()) DEBUG(std::cerr << "\t" << I->getName() << "\n");
DEBUG(std::cerr << "Test module:\n");
for (Module::iterator I =TestModule->begin(),E = TestModule->end(); I!=E;++I)
if (!I->isExternal()) DEBUG(std::cerr << "\t" << I->getName() << "\n");
for (Module::giterator I=TestModule->gbegin(),E = TestModule->gend();I!=E;++I)
if (!I->isExternal()) DEBUG(std::cerr << "\t" << I->getName() << "\n");
// Write out the bytecode to be sent to CBE
std::string SafeModuleBC = "bugpoint.safe.bc";
std::string SafeModuleBC = getUniqueFilename("bugpoint.safe.bc");
if (verifyModule(*SafeModule)) {
std::cerr << "Bytecode file corrupted!\n";
exit(1);
}
if (BD.writeProgramToFile(SafeModuleBC, SafeModule)) {
std::cerr << "Error writing bytecode to `" << SafeModuleBC << "'\nExiting.";
exit(1);
@ -88,48 +208,78 @@ bool ReduceMisCodegenFunctions::TestFuncs(const std::vector<Function*> &Funcs)
DeleteFunctionBody(I);
}
std::string TestModuleBC = "bugpoint.test.bc";
std::string TestModuleBC = getUniqueFilename("bugpoint.test.bc");
if (verifyModule(*TestModule)) {
std::cerr << "Bytecode file corrupted!\n";
exit(1);
}
if (BD.writeProgramToFile(TestModuleBC, TestModule)) {
std::cerr << "Error writing bytecode to `" << SafeModuleBC << "'\nExiting.";
exit(1);
}
delete SafeModule;
delete TestModule;
// Run the code generator on the `Test' code, loading the shared library.
// The function returns whether or not the new output differs from reference.
int Result = BD.diffProgram(TestModuleBC, SharedObject, false);
removeFile(SharedObject);
if (KeepFiles) {
std::cout << "You can reproduce the problem with the command line: \n"
<< "lli (or llc) -load " << SharedObject << " " << TestModuleBC
<< "\n";
} else {
removeFile(TestModuleBC);
removeFile(SafeModuleBC);
removeFile(SharedObject);
}
return Result;
}
namespace {
struct Disambiguator {
std::set<std::string> SymbolNames;
std::set<std::string> SymbolNames;
std::set<GlobalValue*> Symbols;
uint64_t uniqueCounter;
bool externalOnly;
public:
Disambiguator() : uniqueCounter(0), externalOnly(true) {}
void setExternalOnly(bool value) { externalOnly = value; }
void add(GlobalValue &V) {
// If we're only processing externals and this isn't external, bail
if (externalOnly && !V.isExternal()) return;
// If we're already processed this symbol, don't add it again
if (Symbols.count(&V) != 0) return;
if (SymbolNames.count(V.getName()) == 0) {
DEBUG(std::cerr << "Disambiguator: adding " << V.getName()
std::string SymName = V.getName();
// If the symbol starts with a '.', replace it with 'x'
// This solves the problem of not being able to find symbols in an .so
// file when those symbol names start with '.'
if (SymName[0] == '.') {
SymName[0] = 'x';
V.setName(SymName);
}
if (SymbolNames.count(SymName) == 0) {
DEBUG(std::cerr << "Disambiguator: adding " << SymName
<< ", no conflicts.\n");
SymbolNames.insert(V.getName());
SymbolNames.insert(SymName);
} else {
// Mangle name before adding
std::string newName;
do {
newName = V.getName() + "_" + utostr(uniqueCounter);
newName = SymName + "_" + utostr(uniqueCounter);
if (SymbolNames.count(newName) == 0) break;
else ++uniqueCounter;
} while (1);
//while (SymbolNames.count(V->getName()+utostr(uniqueCounter++))==0);
DEBUG(std::cerr << "Disambiguator: conflict: " << V.getName()
DEBUG(std::cerr << "Disambiguator: conflict: " << SymName
<< ", adding: " << newName << "\n");
V.setName(newName);
SymbolNames.insert(newName);
}
Symbols.insert(&V);
}
};
}
@ -138,13 +288,17 @@ void ReduceMisCodegenFunctions::DisambiguateGlobalSymbols(Module *M) {
// First, try not to cause collisions by minimizing chances of renaming an
// already-external symbol, so take in external globals and functions as-is.
Disambiguator D;
DEBUG(std::cerr << "Disambiguating globals (external-only)\n");
for (Module::giterator I = M->gbegin(), E = M->gend(); I != E; ++I) D.add(*I);
DEBUG(std::cerr << "Disambiguating functions (external-only)\n");
for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I) D.add(*I);
// Now just rename functions and globals as necessary, keeping what's already
// in the set unique.
D.setExternalOnly(false);
DEBUG(std::cerr << "Disambiguating globals\n");
for (Module::giterator I = M->gbegin(), E = M->gend(); I != E; ++I) D.add(*I);
DEBUG(std::cerr << "Disambiguating globals\n");
for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I) D.add(*I);
}
@ -157,6 +311,40 @@ bool BugDriver::debugCodeGenerator() {
if (!I->isExternal())
MisCodegenFunctions.push_back(I);
// If we are executing the JIT, we *must* keep the function `main' in the
// module that is passed in, and not the shared library. However, we still
// want to be able to debug the `main' function alone. Thus, we create a new
// function `main' which just calls the old one.
if (isExecutingJIT()) {
// Get the `main' function
Function *oldMain = Program->getNamedFunction("main");
// Rename it
oldMain->setName("old_main");
// Create a NEW `main' function with same type
Function *newMain = new Function(oldMain->getFunctionType(),
GlobalValue::InternalLinkage,
"main", Program);
// Call the old main function and return its result
BasicBlock *BB = new BasicBlock("entry", newMain);
std::vector<Value*> args;
for (Function::aiterator I=newMain->abegin(), E=newMain->aend(); I!=E; ++I)
args.push_back(I);
CallInst *call = new CallInst(oldMain, args);
BB->getInstList().push_back(call);
// if the type of old function wasn't void, return value of call
ReturnInst *ret;
if (oldMain->getReturnType() != Type::VoidTy) {
ret = new ReturnInst(call);
} else {
ret = new ReturnInst();
}
// Add the return instruction to the BasicBlock
BB->getInstList().push_back(ret);
}
// Do the reduction...
ReduceMisCodegenFunctions(*this).reduceList(MisCodegenFunctions);
@ -165,7 +353,7 @@ bool BugDriver::debugCodeGenerator() {
std::cout << "\n";
// Output a bunch of bytecode files for the user...
// ReduceMisCodegenFunctions(*this).TestFuncs(MisCodegenFunctions);
ReduceMisCodegenFunctions(*this).TestFuncs(MisCodegenFunctions, true);
return false;
}

59
tools/bugpoint/ExecutionDriver.cpp
View File

@ -17,6 +17,7 @@ BUGPOINT NOTES:
#include "BugDriver.h"
#include "SystemUtils.h"
#include "Support/CommandLine.h"
#include "Support/Statistic.h"
#include <fstream>
#include <iostream>
@ -101,12 +102,13 @@ int LLI::ExecuteProgram(const std::string &Bytecode,
0
};
std::cout << "<lli>";
return RunProgramWithTimeout(LLIPath, Args,
InputFile, OutputFile, OutputFile);
}
//===----------------------------------------------------------------------===//
// GCC Implementation of AbstractIntepreter interface
// GCC abstraction
//
// This is not a *real* AbstractInterpreter as it does not accept bytecode
// files, but only input acceptable to GCC, i.e. C, C++, and assembly files
@ -145,7 +147,7 @@ int GCC::ExecuteProgram(const std::string &ProgramFile,
FileType fileType,
const std::string &OutputFile,
const std::string &SharedLib) {
std::string OutputBinary = "bugpoint.gcc.exe";
std::string OutputBinary = getUniqueFilename("bugpoint.gcc.exe");
const char **GCCArgs;
const char *ArgsWithoutSO[] = {
@ -159,9 +161,9 @@ int GCC::ExecuteProgram(const std::string &ProgramFile,
};
const char *ArgsWithSO[] = {
GCCPath.c_str(),
SharedLib.c_str(), // Specify the shared library to link in...
"-x", (fileType == AsmFile) ? "assembler" : "c",
ProgramFile.c_str(), // Specify the input filename...
SharedLib.c_str(), // Specify the shared library to link in...
"-o", OutputBinary.c_str(), // Output to the right filename...
"-lm", // Hard-code the math library...
"-O2", // Optimize the program a bit...
@ -181,9 +183,8 @@ int GCC::ExecuteProgram(const std::string &ProgramFile,
0
};
std::cout << "<program>";
// Now that we have a binary, run it!
std::cout << "<program>";
int ProgramResult = RunProgramWithTimeout(OutputBinary, ProgramArgs,
InputFile, OutputFile, OutputFile);
std::cout << "\n";
@ -194,7 +195,7 @@ int GCC::ExecuteProgram(const std::string &ProgramFile,
int GCC::MakeSharedObject(const std::string &InputFile,
FileType fileType,
std::string &OutputFile) {
OutputFile = "./bugpoint.so";
OutputFile = getUniqueFilename("./bugpoint.so");
// Compile the C/asm file into a shared object
const char* GCCArgs[] = {
GCCPath.c_str(),
@ -277,7 +278,6 @@ public:
int OutputAsm(const std::string &Bytecode,
std::string &OutputAsmFile);
};
int LLC::OutputAsm(const std::string &Bytecode,
@ -347,26 +347,25 @@ public:
int JIT::ExecuteProgram(const std::string &Bytecode,
const std::string &OutputFile,
const std::string &SharedLib) {
if (SharedLib.empty()) {
const char* Args[] = {
LLIPath.c_str(),
"-quiet",
"-force-interpreter=false",
Bytecode.c_str(),
0
};
return RunProgramWithTimeout(LLIPath, Args,
InputFile, OutputFile, OutputFile);
} else {
const char* Args[] = {
LLIPath.c_str(), "-quiet", "-force-interpreter=false",
"-load", SharedLib.c_str(),
Bytecode.c_str(),
0
};
return RunProgramWithTimeout(LLIPath, Args,
InputFile, OutputFile, OutputFile);
}
const char* ArgsWithoutSO[] = {
LLIPath.c_str(), "-quiet", "-force-interpreter=false",
Bytecode.c_str(),
0
};
const char* ArgsWithSO[] = {
LLIPath.c_str(), "-quiet", "-force-interpreter=false",
"-load", SharedLib.c_str(),
Bytecode.c_str(),
0
};
const char** JITArgs = SharedLib.empty() ? ArgsWithoutSO : ArgsWithSO;
std::cout << "<jit>";
DEBUG(std::cerr << "\nSending output to " << OutputFile << "\n");
return RunProgramWithTimeout(LLIPath, JITArgs,
InputFile, OutputFile, OutputFile);
}
//===----------------------------------------------------------------------===//
@ -591,7 +590,11 @@ bool BugDriver::diffProgram(const std::string &BytecodeFile,
if (C1 != C2) { FilesDifferent = true; break; }
} while (C1 != EOF);
removeFile(Output);
//removeFile(Output);
if (RemoveBytecode) removeFile(BytecodeFile);
return FilesDifferent;
}
bool BugDriver::isExecutingJIT() {
return InterpreterSel == RunJIT;
}