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//===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
//
// This is the llc compiler driver.
//
//===----------------------------------------------------------------------===//
#include "llvm/Bytecode/Reader.h"
#include "llvm/Optimizations/Normalize.h"
#include "llvm/Target/Sparc.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Module.h"
#include "llvm/Method.h"
#include <memory>
#include <fstream>
cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false);
cl::Flag DumpAsm ("d", "Print assembly as compiled", cl::Hidden, false);
#include "llvm/Assembly/Writer.h" // For DumpAsm
//-------------------------- Internal Functions ------------------------------//
/////
// TODO: Remove to external file.... When Chris gets back he'll do it
/////
#include "llvm/DerivedTypes.h"
#include "llvm/iMemory.h"
#include "llvm/iOther.h"
#include "llvm/SymbolTable.h"
Method *MallocMeth = 0, *FreeMeth = 0;
// InsertMallocFreeDecls - Insert an external declaration for malloc and an
// external declaration for free for use by the ReplaceMallocFree function.
//
static void InsertMallocFreeDecls(Module *M) {
const MethodType *MallocType =
MethodType::get(PointerType::get(Type::UByteTy),
vector<const Type*>(1, Type::UIntTy), false);
SymbolTable *SymTab = M->getSymbolTableSure();
// Check for a definition of malloc
if (Value *V = SymTab->lookup(PointerType::get(MallocType), "malloc")) {
MallocMeth = cast<Method>(V); // Yup, got it
} else { // Nope, add one
M->getMethodList().push_back(MallocMeth = new Method(MallocType, "malloc"));
}
const MethodType *FreeType =
MethodType::get(Type::VoidTy,
vector<const Type*>(1, PointerType::get(Type::UByteTy)),
false);
// Check for a definition of free
if (Value *V = SymTab->lookup(PointerType::get(FreeType), "free")) {
FreeMeth = cast<Method>(V); // Yup, got it
} else { // Nope, add one
M->getMethodList().push_back(FreeMeth = new Method(FreeType, "free"));
}
}
static void ReplaceMallocFree(Method *M, const TargetData &DataLayout) {
assert(MallocMeth && FreeMeth && M && "Must call InsertMallocFreeDecls!");
// Loop over all of the instructions, looking for malloc or free instructions
for (Method::iterator BBI = M->begin(), BBE = M->end(); BBI != BBE; ++BBI) {
BasicBlock *BB = *BBI;
for (unsigned i = 0; i < BB->size(); ++i) {
BasicBlock::InstListType &BBIL = BB->getInstList();
if (MallocInst *MI = dyn_cast<MallocInst>(*(BBIL.begin()+i))) {
BBIL.remove(BBIL.begin()+i); // remove the malloc instr...
const Type *AllocTy = cast<PointerType>(MI->getType())->getValueType();
// If the user is allocating an unsized array with a dynamic size arg,
// start by getting the size of one element.
//
if (const ArrayType *ATy = dyn_cast<ArrayType>(AllocTy))
if (ATy->isUnsized()) AllocTy = ATy->getElementType();
// Get the number of bytes to be allocated for one element of the
// requested type...
unsigned Size = DataLayout.getTypeSize(AllocTy);
// malloc(type) becomes sbyte *malloc(constint)
Value *MallocArg = ConstPoolUInt::get(Type::UIntTy, Size);
if (MI->getNumOperands() && Size == 1) {
MallocArg = MI->getOperand(0); // Operand * 1 = Operand
} else if (MI->getNumOperands()) {
// Multiply it by the array size if neccesary...
MallocArg = BinaryOperator::create(Instruction::Mul,MI->getOperand(0),
MallocArg);
BBIL.insert(BBIL.begin()+i++, cast<Instruction>(MallocArg));
}
// Create the call to Malloc...
CallInst *MCall = new CallInst(MallocMeth,
vector<Value*>(1, MallocArg));
BBIL.insert(BBIL.begin()+i, MCall);
// Create a cast instruction to convert to the right type...
CastInst *MCast = new CastInst(MCall, MI->getType());
BBIL.insert(BBIL.begin()+i+1, MCast);
// Replace all uses of the old malloc inst with the cast inst
MI->replaceAllUsesWith(MCast);
delete MI; // Delete the malloc inst
} else if (FreeInst *FI = dyn_cast<FreeInst>(*(BBIL.begin()+i))) {
BBIL.remove(BB->getInstList().begin()+i);
// Cast the argument to free into a ubyte*...
CastInst *MCast = new CastInst(FI->getOperand(0),
PointerType::get(Type::UByteTy));
BBIL.insert(BBIL.begin()+i, MCast);
// Insert a call to the free function...
CallInst *FCall = new CallInst(FreeMeth,
vector<Value*>(1, MCast));
BBIL.insert(BBIL.begin()+i+1, FCall);
// Delete the old free instruction
delete FI;
}
}
}
}
// END TODO: Remove to external file....
static void NormalizeMethod(Method *M) {
NormalizePhiConstantArgs(M);
}
//===---------------------------------------------------------------------===//
// Function main()
//
// Entry point for the llc compiler.
//===---------------------------------------------------------------------===//
int main(int argc, char **argv) {
// Parse command line options...
cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
// Allocate a target... in the future this will be controllable on the
// command line.
auto_ptr<TargetMachine> Target(allocateSparcTargetMachine());
// Load the module to be compiled...
auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
if (M.get() == 0) {
cerr << "bytecode didn't read correctly.\n";
return 1;
}
InsertMallocFreeDecls(M.get());
// Loop over all of the methods in the module, compiling them.
for (Module::const_iterator MI = M->begin(), ME = M->end(); MI != ME; ++MI) {
Method *Meth = *MI;
NormalizeMethod(Meth);
ReplaceMallocFree(Meth, Target->DataLayout);
if (DumpAsm)
cerr << "Method after xformations: \n" << Meth;
if (Target->compileMethod(Meth)) {
cerr << "Error compiling " << InputFilename << "!\n";
return 1;
}
}
// Figure out where we are going to send the output...
ostream *Out = 0;
if (OutputFilename != "") { // Specified an output filename?
Out = new ofstream(OutputFilename.c_str(),
(Force ? 0 : ios::noreplace)|ios::out);
} else {
if (InputFilename == "-") {
OutputFilename = "-";
Out = &cout;
} else {
string IFN = InputFilename;
int Len = IFN.length();
if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
OutputFilename = string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
} else {
OutputFilename = IFN; // Append a .s to it
}
OutputFilename += ".s";
Out = new ofstream(OutputFilename.c_str(),
(Force ? 0 : ios::noreplace)|ios::out);
if (!Out->good()) {
cerr << "Error opening " << OutputFilename << "!\n";
delete Out;
return 1;
}
}
}
// Emit the output...
Target->emitAssembly(M.get(), *Out);
if (Out != &cout) delete Out;
return 0;
}
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