mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 03:29:40 +00:00
* Changed tabs to spaces * Removed a space between a function call and its arguments (...) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8712 91177308-0d34-0410-b5e6-96231b3b80d8
150 lines
5.5 KiB
C++
150 lines
5.5 KiB
C++
//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
|
|
//
|
|
// This utility provides a way to execute LLVM bytecode without static
|
|
// compilation. This consists of a very simple and slow (but portable)
|
|
// interpreter, along with capability for system specific dynamic compilers. At
|
|
// runtime, the fastest (stable) execution engine is selected to run the
|
|
// program. This means the JIT compiler for the current platform if it's
|
|
// available.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/Bytecode/Reader.h"
|
|
#include "llvm/ExecutionEngine/ExecutionEngine.h"
|
|
#include "llvm/ExecutionEngine/GenericValue.h"
|
|
#include "llvm/Target/TargetMachineImpls.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "Support/CommandLine.h"
|
|
#include "Support/Debug.h"
|
|
|
|
namespace {
|
|
cl::opt<std::string>
|
|
InputFile(cl::desc("<input bytecode>"), cl::Positional, cl::init("-"));
|
|
|
|
cl::list<std::string>
|
|
InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
|
|
|
|
cl::opt<std::string>
|
|
MainFunction("f", cl::desc("Function to execute"), cl::init("main"),
|
|
cl::value_desc("function name"));
|
|
|
|
cl::opt<bool> TraceMode("trace", cl::desc("Enable Tracing"));
|
|
|
|
cl::opt<bool> ForceInterpreter("force-interpreter",
|
|
cl::desc("Force interpretation: disable JIT"),
|
|
cl::init(false));
|
|
}
|
|
|
|
static std::vector<std::string> makeStringVector(const char **envp) {
|
|
std::vector<std::string> rv;
|
|
for (unsigned i = 0; envp[i]; ++i)
|
|
rv.push_back(envp[i]);
|
|
return rv;
|
|
}
|
|
|
|
static void *CreateArgv(ExecutionEngine *EE,
|
|
const std::vector<std::string> &InputArgv) {
|
|
if (EE->getTargetData().getPointerSize() == 8) { // 64 bit target?
|
|
PointerTy *Result = new PointerTy[InputArgv.size()+1];
|
|
DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
|
|
|
|
for (unsigned i = 0; i < InputArgv.size(); ++i) {
|
|
unsigned Size = InputArgv[i].size()+1;
|
|
char *Dest = new char[Size];
|
|
DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
|
|
|
|
std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
|
|
Dest[Size-1] = 0;
|
|
|
|
// Endian safe: Result[i] = (PointerTy)Dest;
|
|
EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i),
|
|
Type::LongTy);
|
|
}
|
|
Result[InputArgv.size()] = 0;
|
|
return Result;
|
|
} else { // 32 bit target?
|
|
int *Result = new int[InputArgv.size()+1];
|
|
DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
|
|
|
|
for (unsigned i = 0; i < InputArgv.size(); ++i) {
|
|
unsigned Size = InputArgv[i].size()+1;
|
|
char *Dest = new char[Size];
|
|
DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
|
|
|
|
std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
|
|
Dest[Size-1] = 0;
|
|
|
|
// Endian safe: Result[i] = (PointerTy)Dest;
|
|
EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i),
|
|
Type::IntTy);
|
|
}
|
|
Result[InputArgv.size()] = 0; // null terminate it
|
|
return Result;
|
|
}
|
|
}
|
|
|
|
/// callAsMain - Call the function named FnName from M as if its
|
|
/// signature were int main (int argc, char **argv, const char
|
|
/// **envp), using the contents of Args to determine argc & argv, and
|
|
/// the contents of EnvVars to determine envp. Returns the result
|
|
/// from calling FnName, or -1 and prints an error msg. if the named
|
|
/// function cannot be found.
|
|
///
|
|
int callAsMain(ExecutionEngine *EE, Module *M, const std::string &FnName,
|
|
const std::vector<std::string> &Args,
|
|
const std::vector<std::string> &EnvVars) {
|
|
Function *Fn = M->getNamedFunction(FnName);
|
|
if (!Fn) {
|
|
std::cerr << "Function '" << FnName << "' not found in module.\n";
|
|
return -1;
|
|
}
|
|
std::vector<GenericValue> GVArgs;
|
|
GenericValue GVArgc;
|
|
GVArgc.IntVal = Args.size();
|
|
GVArgs.push_back(GVArgc); // Arg #0 = argc.
|
|
GVArgs.push_back(PTOGV(CreateArgv(EE, Args))); // Arg #1 = argv.
|
|
GVArgs.push_back(PTOGV(CreateArgv(EE, EnvVars))); // Arg #2 = envp.
|
|
return EE->run(Fn, GVArgs).IntVal;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// main Driver function
|
|
//
|
|
int main(int argc, char **argv, const char **envp) {
|
|
cl::ParseCommandLineOptions(argc, argv,
|
|
" llvm interpreter & dynamic compiler\n");
|
|
|
|
// Load the bytecode...
|
|
std::string ErrorMsg;
|
|
Module *M = ParseBytecodeFile(InputFile, &ErrorMsg);
|
|
if (M == 0) {
|
|
std::cout << "Error parsing '" << InputFile << "': "
|
|
<< ErrorMsg << "\n";
|
|
exit(1);
|
|
}
|
|
|
|
ExecutionEngine *EE =
|
|
ExecutionEngine::create(M, ForceInterpreter, TraceMode);
|
|
assert(EE && "Couldn't create an ExecutionEngine, not even an interpreter?");
|
|
|
|
// Add the module's name to the start of the vector of arguments to main().
|
|
// But delete .bc first, since programs (and users) might not expect to
|
|
// see it.
|
|
const std::string ByteCodeFileSuffix(".bc");
|
|
if (InputFile.rfind(ByteCodeFileSuffix) ==
|
|
InputFile.length() - ByteCodeFileSuffix.length()) {
|
|
InputFile.erase(InputFile.length() - ByteCodeFileSuffix.length());
|
|
}
|
|
InputArgv.insert(InputArgv.begin(), InputFile);
|
|
|
|
// Run the main function!
|
|
int ExitCode = callAsMain(EE, M, MainFunction, InputArgv,
|
|
makeStringVector(envp));
|
|
|
|
// Now that we are done executing the program, shut down the execution engine
|
|
delete EE;
|
|
return ExitCode;
|
|
}
|