forked from OSchip/llvm-project
383 lines
13 KiB
C++
383 lines
13 KiB
C++
//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This tool implements a just-in-time compiler for LLVM, allowing direct
|
|
// execution of LLVM bytecode in an efficient manner.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "JIT.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/GlobalVariable.h"
|
|
#include "llvm/Instructions.h"
|
|
#include "llvm/ModuleProvider.h"
|
|
#include "llvm/CodeGen/MachineCodeEmitter.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/ExecutionEngine/GenericValue.h"
|
|
#include "llvm/Support/MutexGuard.h"
|
|
#include "llvm/System/DynamicLibrary.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetJITInfo.h"
|
|
using namespace llvm;
|
|
|
|
#ifdef __APPLE__
|
|
#include <AvailabilityMacros.h>
|
|
#if defined(MAC_OS_X_VERSION_10_4) && \
|
|
((MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4) || \
|
|
(MAC_OS_X_VERSION_MIN_REQUIRED == MAC_OS_X_VERSION_10_4 && \
|
|
__APPLE_CC__ >= 5330))
|
|
// __dso_handle is resolved by Mac OS X dynamic linker.
|
|
extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
|
|
#endif
|
|
#endif
|
|
|
|
static struct RegisterJIT {
|
|
RegisterJIT() { JIT::Register(); }
|
|
} JITRegistrator;
|
|
|
|
namespace llvm {
|
|
void LinkInJIT() {
|
|
}
|
|
}
|
|
|
|
JIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji)
|
|
: ExecutionEngine(MP), TM(tm), TJI(tji), state(MP) {
|
|
setTargetData(TM.getTargetData());
|
|
|
|
// Initialize MCE
|
|
MCE = createEmitter(*this);
|
|
|
|
// Add target data
|
|
MutexGuard locked(lock);
|
|
FunctionPassManager &PM = state.getPM(locked);
|
|
PM.add(new TargetData(*TM.getTargetData()));
|
|
|
|
// Turn the machine code intermediate representation into bytes in memory that
|
|
// may be executed.
|
|
if (TM.addPassesToEmitMachineCode(PM, *MCE, false /*fast*/)) {
|
|
cerr << "Target does not support machine code emission!\n";
|
|
abort();
|
|
}
|
|
|
|
// Initialize passes.
|
|
PM.doInitialization();
|
|
}
|
|
|
|
JIT::~JIT() {
|
|
delete MCE;
|
|
delete &TM;
|
|
}
|
|
|
|
/// run - Start execution with the specified function and arguments.
|
|
///
|
|
GenericValue JIT::runFunction(Function *F,
|
|
const std::vector<GenericValue> &ArgValues) {
|
|
assert(F && "Function *F was null at entry to run()");
|
|
|
|
void *FPtr = getPointerToFunction(F);
|
|
assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
|
|
const FunctionType *FTy = F->getFunctionType();
|
|
const Type *RetTy = FTy->getReturnType();
|
|
|
|
assert((FTy->getNumParams() <= ArgValues.size() || FTy->isVarArg()) &&
|
|
"Too many arguments passed into function!");
|
|
assert(FTy->getNumParams() == ArgValues.size() &&
|
|
"This doesn't support passing arguments through varargs (yet)!");
|
|
|
|
// Handle some common cases first. These cases correspond to common `main'
|
|
// prototypes.
|
|
if (RetTy == Type::Int32Ty || RetTy == Type::Int32Ty || RetTy == Type::VoidTy) {
|
|
switch (ArgValues.size()) {
|
|
case 3:
|
|
if ((FTy->getParamType(0) == Type::Int32Ty ||
|
|
FTy->getParamType(0) == Type::Int32Ty) &&
|
|
isa<PointerType>(FTy->getParamType(1)) &&
|
|
isa<PointerType>(FTy->getParamType(2))) {
|
|
int (*PF)(int, char **, const char **) =
|
|
(int(*)(int, char **, const char **))(intptr_t)FPtr;
|
|
|
|
// Call the function.
|
|
GenericValue rv;
|
|
rv.Int32Val = PF(ArgValues[0].Int32Val, (char **)GVTOP(ArgValues[1]),
|
|
(const char **)GVTOP(ArgValues[2]));
|
|
return rv;
|
|
}
|
|
break;
|
|
case 2:
|
|
if ((FTy->getParamType(0) == Type::Int32Ty ||
|
|
FTy->getParamType(0) == Type::Int32Ty) &&
|
|
isa<PointerType>(FTy->getParamType(1))) {
|
|
int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
|
|
|
|
// Call the function.
|
|
GenericValue rv;
|
|
rv.Int32Val = PF(ArgValues[0].Int32Val, (char **)GVTOP(ArgValues[1]));
|
|
return rv;
|
|
}
|
|
break;
|
|
case 1:
|
|
if (FTy->getNumParams() == 1 &&
|
|
(FTy->getParamType(0) == Type::Int32Ty ||
|
|
FTy->getParamType(0) == Type::Int32Ty)) {
|
|
GenericValue rv;
|
|
int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
|
|
rv.Int32Val = PF(ArgValues[0].Int32Val);
|
|
return rv;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Handle cases where no arguments are passed first.
|
|
if (ArgValues.empty()) {
|
|
GenericValue rv;
|
|
switch (RetTy->getTypeID()) {
|
|
default: assert(0 && "Unknown return type for function call!");
|
|
case Type::IntegerTyID: {
|
|
unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
|
|
if (BitWidth == 1)
|
|
rv.Int1Val = ((bool(*)())(intptr_t)FPtr)();
|
|
else if (BitWidth <= 8)
|
|
rv.Int8Val = ((char(*)())(intptr_t)FPtr)();
|
|
else if (BitWidth <= 16)
|
|
rv.Int16Val = ((short(*)())(intptr_t)FPtr)();
|
|
else if (BitWidth <= 32)
|
|
rv.Int32Val = ((int(*)())(intptr_t)FPtr)();
|
|
else if (BitWidth <= 64)
|
|
rv.Int64Val = ((int64_t(*)())(intptr_t)FPtr)();
|
|
else
|
|
assert(0 && "Integer types > 64 bits not supported");
|
|
return rv;
|
|
}
|
|
case Type::VoidTyID:
|
|
rv.Int32Val = ((int(*)())(intptr_t)FPtr)();
|
|
return rv;
|
|
case Type::FloatTyID:
|
|
rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
|
|
return rv;
|
|
case Type::DoubleTyID:
|
|
rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
|
|
return rv;
|
|
case Type::PointerTyID:
|
|
return PTOGV(((void*(*)())(intptr_t)FPtr)());
|
|
}
|
|
}
|
|
|
|
// Okay, this is not one of our quick and easy cases. Because we don't have a
|
|
// full FFI, we have to codegen a nullary stub function that just calls the
|
|
// function we are interested in, passing in constants for all of the
|
|
// arguments. Make this function and return.
|
|
|
|
// First, create the function.
|
|
FunctionType *STy=FunctionType::get(RetTy, std::vector<const Type*>(), false);
|
|
Function *Stub = new Function(STy, Function::InternalLinkage, "",
|
|
F->getParent());
|
|
|
|
// Insert a basic block.
|
|
BasicBlock *StubBB = new BasicBlock("", Stub);
|
|
|
|
// Convert all of the GenericValue arguments over to constants. Note that we
|
|
// currently don't support varargs.
|
|
SmallVector<Value*, 8> Args;
|
|
for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) {
|
|
Constant *C = 0;
|
|
const Type *ArgTy = FTy->getParamType(i);
|
|
const GenericValue &AV = ArgValues[i];
|
|
switch (ArgTy->getTypeID()) {
|
|
default: assert(0 && "Unknown argument type for function call!");
|
|
case Type::IntegerTyID: {
|
|
unsigned BitWidth = cast<IntegerType>(ArgTy)->getBitWidth();
|
|
if (BitWidth == 1)
|
|
C = ConstantInt::get(ArgTy, AV.Int1Val);
|
|
else if (BitWidth <= 8)
|
|
C = ConstantInt::get(ArgTy, AV.Int8Val);
|
|
else if (BitWidth <= 16)
|
|
C = ConstantInt::get(ArgTy, AV.Int16Val);
|
|
else if (BitWidth <= 32)
|
|
C = ConstantInt::get(ArgTy, AV.Int32Val);
|
|
else if (BitWidth <= 64)
|
|
C = ConstantInt::get(ArgTy, AV.Int64Val);
|
|
else
|
|
assert(0 && "Integer types > 64 bits not supported");
|
|
break;
|
|
}
|
|
case Type::FloatTyID: C = ConstantFP ::get(ArgTy, AV.FloatVal); break;
|
|
case Type::DoubleTyID: C = ConstantFP ::get(ArgTy, AV.DoubleVal); break;
|
|
case Type::PointerTyID:
|
|
void *ArgPtr = GVTOP(AV);
|
|
if (sizeof(void*) == 4) {
|
|
C = ConstantInt::get(Type::Int32Ty, (int)(intptr_t)ArgPtr);
|
|
} else {
|
|
C = ConstantInt::get(Type::Int64Ty, (intptr_t)ArgPtr);
|
|
}
|
|
C = ConstantExpr::getIntToPtr(C, ArgTy); // Cast the integer to pointer
|
|
break;
|
|
}
|
|
Args.push_back(C);
|
|
}
|
|
|
|
CallInst *TheCall = new CallInst(F, &Args[0], Args.size(), "", StubBB);
|
|
TheCall->setTailCall();
|
|
if (TheCall->getType() != Type::VoidTy)
|
|
new ReturnInst(TheCall, StubBB); // Return result of the call.
|
|
else
|
|
new ReturnInst(StubBB); // Just return void.
|
|
|
|
// Finally, return the value returned by our nullary stub function.
|
|
return runFunction(Stub, std::vector<GenericValue>());
|
|
}
|
|
|
|
/// runJITOnFunction - Run the FunctionPassManager full of
|
|
/// just-in-time compilation passes on F, hopefully filling in
|
|
/// GlobalAddress[F] with the address of F's machine code.
|
|
///
|
|
void JIT::runJITOnFunction(Function *F) {
|
|
static bool isAlreadyCodeGenerating = false;
|
|
assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!");
|
|
|
|
MutexGuard locked(lock);
|
|
|
|
// JIT the function
|
|
isAlreadyCodeGenerating = true;
|
|
state.getPM(locked).run(*F);
|
|
isAlreadyCodeGenerating = false;
|
|
|
|
// If the function referred to a global variable that had not yet been
|
|
// emitted, it allocates memory for the global, but doesn't emit it yet. Emit
|
|
// all of these globals now.
|
|
while (!state.getPendingGlobals(locked).empty()) {
|
|
const GlobalVariable *GV = state.getPendingGlobals(locked).back();
|
|
state.getPendingGlobals(locked).pop_back();
|
|
EmitGlobalVariable(GV);
|
|
}
|
|
}
|
|
|
|
/// getPointerToFunction - This method is used to get the address of the
|
|
/// specified function, compiling it if neccesary.
|
|
///
|
|
void *JIT::getPointerToFunction(Function *F) {
|
|
MutexGuard locked(lock);
|
|
|
|
if (void *Addr = getPointerToGlobalIfAvailable(F))
|
|
return Addr; // Check if function already code gen'd
|
|
|
|
// Make sure we read in the function if it exists in this Module.
|
|
if (F->hasNotBeenReadFromBytecode()) {
|
|
// Determine the module provider this function is provided by.
|
|
Module *M = F->getParent();
|
|
ModuleProvider *MP = 0;
|
|
for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
|
|
if (Modules[i]->getModule() == M) {
|
|
MP = Modules[i];
|
|
break;
|
|
}
|
|
}
|
|
assert(MP && "Function isn't in a module we know about!");
|
|
|
|
std::string ErrorMsg;
|
|
if (MP->materializeFunction(F, &ErrorMsg)) {
|
|
cerr << "Error reading function '" << F->getName()
|
|
<< "' from bytecode file: " << ErrorMsg << "\n";
|
|
abort();
|
|
}
|
|
}
|
|
|
|
if (F->isDeclaration()) {
|
|
void *Addr = getPointerToNamedFunction(F->getName());
|
|
addGlobalMapping(F, Addr);
|
|
return Addr;
|
|
}
|
|
|
|
runJITOnFunction(F);
|
|
|
|
void *Addr = getPointerToGlobalIfAvailable(F);
|
|
assert(Addr && "Code generation didn't add function to GlobalAddress table!");
|
|
return Addr;
|
|
}
|
|
|
|
/// getOrEmitGlobalVariable - Return the address of the specified global
|
|
/// variable, possibly emitting it to memory if needed. This is used by the
|
|
/// Emitter.
|
|
void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
|
|
MutexGuard locked(lock);
|
|
|
|
void *Ptr = getPointerToGlobalIfAvailable(GV);
|
|
if (Ptr) return Ptr;
|
|
|
|
// If the global is external, just remember the address.
|
|
if (GV->isDeclaration()) {
|
|
#if defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_4) && \
|
|
((MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4) || \
|
|
(MAC_OS_X_VERSION_MIN_REQUIRED == MAC_OS_X_VERSION_10_4 && \
|
|
__APPLE_CC__ >= 5330))
|
|
// Apple gcc defaults to -fuse-cxa-atexit (i.e. calls __cxa_atexit instead
|
|
// of atexit). It passes the address of linker generated symbol __dso_handle
|
|
// to the function.
|
|
// This configuration change happened at version 5330.
|
|
if (GV->getName() == "__dso_handle")
|
|
return (void*)&__dso_handle;
|
|
#endif
|
|
Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName().c_str());
|
|
if (Ptr == 0) {
|
|
cerr << "Could not resolve external global address: "
|
|
<< GV->getName() << "\n";
|
|
abort();
|
|
}
|
|
} else {
|
|
// If the global hasn't been emitted to memory yet, allocate space. We will
|
|
// actually initialize the global after current function has finished
|
|
// compilation.
|
|
const Type *GlobalType = GV->getType()->getElementType();
|
|
size_t S = getTargetData()->getTypeSize(GlobalType);
|
|
size_t A = getTargetData()->getTypeAlignmentPref(GlobalType);
|
|
if (A <= 8) {
|
|
Ptr = malloc(S);
|
|
} else {
|
|
// Allocate S+A bytes of memory, then use an aligned pointer within that
|
|
// space.
|
|
Ptr = malloc(S+A);
|
|
unsigned MisAligned = ((intptr_t)Ptr & (A-1));
|
|
Ptr = (char*)Ptr + (MisAligned ? (A-MisAligned) : 0);
|
|
}
|
|
state.getPendingGlobals(locked).push_back(GV);
|
|
}
|
|
addGlobalMapping(GV, Ptr);
|
|
return Ptr;
|
|
}
|
|
|
|
|
|
/// recompileAndRelinkFunction - This method is used to force a function
|
|
/// which has already been compiled, to be compiled again, possibly
|
|
/// after it has been modified. Then the entry to the old copy is overwritten
|
|
/// with a branch to the new copy. If there was no old copy, this acts
|
|
/// just like JIT::getPointerToFunction().
|
|
///
|
|
void *JIT::recompileAndRelinkFunction(Function *F) {
|
|
void *OldAddr = getPointerToGlobalIfAvailable(F);
|
|
|
|
// If it's not already compiled there is no reason to patch it up.
|
|
if (OldAddr == 0) { return getPointerToFunction(F); }
|
|
|
|
// Delete the old function mapping.
|
|
addGlobalMapping(F, 0);
|
|
|
|
// Recodegen the function
|
|
runJITOnFunction(F);
|
|
|
|
// Update state, forward the old function to the new function.
|
|
void *Addr = getPointerToGlobalIfAvailable(F);
|
|
assert(Addr && "Code generation didn't add function to GlobalAddress table!");
|
|
TJI.replaceMachineCodeForFunction(OldAddr, Addr);
|
|
return Addr;
|
|
}
|
|
|