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cgutils.cpp
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cgutils.cpp
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// utility procedures used in code generation
// Fixing up references to other modules for MCJIT
static GlobalVariable *prepare_global(GlobalVariable *G)
{
#ifdef USE_MCJIT
if (G->getParent() != jl_Module) {
GlobalVariable *gv = jl_Module->getGlobalVariable(G->getName());
if (!gv) {
gv = new GlobalVariable(*jl_Module, G->getType()->getElementType(),
G->isConstant(), GlobalVariable::ExternalLinkage,
NULL, G->getName());
}
return gv;
}
#endif
return G;
}
static llvm::Value *prepare_call(llvm::Value* Callee)
{
#ifdef USE_MCJIT
llvm::Function *F = dyn_cast<Function>(Callee);
if (!F)
return Callee;
if (F->getParent() != jl_Module) {
Function *ModuleF = jl_Module->getFunction(F->getName());
if (ModuleF) {
return ModuleF;
}
else {
return Function::Create(F->getFunctionType(),
Function::ExternalLinkage,
F->getName(),
jl_Module);
}
}
#endif
return Callee;
}
static inline void add_named_global(GlobalValue *gv, void *addr)
{
#ifdef USE_MCJIT
sys::DynamicLibrary::AddSymbol(gv->getName(),addr);
#else
jl_ExecutionEngine->addGlobalMapping(gv,addr);
#endif
}
// --- string constants ---
static std::map<const std::string, GlobalVariable*> stringConstants;
static GlobalVariable *stringConst(const std::string &txt)
{
GlobalVariable *gv = stringConstants[txt];
static int strno = 0;
if (gv == NULL) {
std::stringstream ssno;
std::string vname;
ssno << strno;
vname += "_j_str";
vname += ssno.str();
gv = new GlobalVariable(*jl_Module,
ArrayType::get(T_int8, txt.length()+1),
true,
imaging_mode ? GlobalVariable::PrivateLinkage : GlobalVariable::ExternalLinkage,
#ifndef LLVM_VERSION_MAJOR
ConstantArray::get(getGlobalContext(),
txt.c_str()),
#elif LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 1
ConstantDataArray::get(getGlobalContext(),
ArrayRef<unsigned char>(
(const unsigned char*)txt.c_str(),
txt.length()+1)),
#endif
vname);
stringConstants[txt] = gv;
strno++;
}
return gv;
}
// --- Shadow module handling ---
typedef struct {Value* gv; int32_t index;} jl_value_llvm; // uses 1-based indexing
static std::map<void*, jl_value_llvm> jl_value_to_llvm;
static std::map<Value *, void*> llvm_to_jl_value;
#ifdef USE_MCJIT
class FunctionMover;
static Function *clone_llvm_function(llvm::Function *toClone,FunctionMover *mover);
class FunctionMover : public ValueMaterializer
{
public:
FunctionMover(llvm::Module *dest,llvm::Module *src) :
ValueMaterializer(), VMap(), destModule(dest), srcModule(src)
{
}
ValueToValueMapTy VMap;
llvm::Module *destModule;
llvm::Module *srcModule;
virtual Value *materializeValueFor (Value *V)
{
Function *F = dyn_cast<Function>(V);
if (F) {
if (F->isIntrinsic()) {
return destModule->getOrInsertFunction(F->getName(),F->getFunctionType());
}
if (F->isDeclaration() || F->getParent() != destModule) {
Function *shadow = srcModule->getFunction(F->getName());
if (shadow != NULL && !shadow->isDeclaration()) {
// Not truly external
// Check whether we already emitted it once
uint64_t addr = jl_mcjmm->getSymbolAddress(F->getName());
if (addr == 0) {
return clone_llvm_function(shadow,this);
}
else {
return destModule->getOrInsertFunction(F->getName(),F->getFunctionType());
}
}
else if (!F->isDeclaration()) {
return clone_llvm_function(F,this);
}
}
// Still a declaration and still in a different module
if (F->isDeclaration() && F->getParent() != destModule) {
// Create forward declaration in current module
return destModule->getOrInsertFunction(F->getName(),F->getFunctionType());
}
}
else if (isa<GlobalVariable>(V)) {
GlobalVariable *GV = cast<GlobalVariable>(V);
assert(GV != NULL);
GlobalVariable *newGV = new GlobalVariable(*destModule,
GV->getType()->getElementType(),
GV->isConstant(),
GlobalVariable::ExternalLinkage,
NULL,
GV->getName());
newGV->copyAttributesFrom(GV);
if (GV->isDeclaration())
return newGV;
uint64_t addr = jl_mcjmm->getSymbolAddress(GV->getName());
if (addr != 0) {
newGV->setExternallyInitialized(true);
return newGV;
}
std::map<Value*, void *>::iterator it;
it = llvm_to_jl_value.find(GV);
if (it != llvm_to_jl_value.end()) {
newGV->setInitializer(Constant::getIntegerValue(GV->getType()->getElementType(),APInt(sizeof(void*)*8,(ptrint_t)it->second)));
newGV->setConstant(true);
}
else if (GV->hasInitializer()) {
Value *C = MapValue(GV->getInitializer(),VMap,RF_None,NULL,this);
newGV->setInitializer(cast<Constant>(C));
}
return newGV;
}
return NULL;
};
};
static Function *clone_llvm_function(llvm::Function *toClone,FunctionMover *mover)
{
Function *NewF = Function::Create(toClone->getFunctionType(),
Function::ExternalLinkage,
toClone->getName(),
mover->destModule);
ClonedCodeInfo info;
Function::arg_iterator DestI = NewF->arg_begin();
for (Function::const_arg_iterator I = toClone->arg_begin(), E = toClone->arg_end(); I != E; ++I) {
DestI->setName(I->getName()); // Copy the name over...
mover->VMap[I] = DestI++; // Add mapping to VMap
}
// Necessary in case the function is self referential
mover->VMap[toClone] = NewF;
SmallVector<ReturnInst*, 8> Returns;
llvm::CloneFunctionInto(NewF,toClone,mover->VMap,true,Returns,"",NULL,NULL,mover);
return NewF;
}
#endif
// --- emitting pointers directly into code ---
static Value *literal_static_pointer_val(void *p, Type *t)
{
// this function will emit a static pointer into the generated code
// the generated code will only be valid during the current session,
// and thus, this should typically be avoided in new API's
#if defined(_P64)
return ConstantExpr::getIntToPtr(ConstantInt::get(T_int64, (uint64_t)p), t);
#else
return ConstantExpr::getIntToPtr(ConstantInt::get(T_int32, (uint32_t)p), t);
#endif
}
static std::vector<Constant*> jl_sysimg_gvars;
extern "C" int32_t jl_get_llvm_gv(jl_value_t *p)
{
// map a jl_value_t memory location to a GlobalVariable
std::map<void*, jl_value_llvm>::iterator it;
it = jl_value_to_llvm.find(p);
if (it == jl_value_to_llvm.end())
return 0;
return it->second.index;
}
static void jl_gen_llvm_gv_array()
{
// emit the variable table into the code image (can only call this once)
// used just before dumping bitcode
ArrayType *atype = ArrayType::get(T_psize,jl_sysimg_gvars.size());
new GlobalVariable(
*jl_Module,
atype,
true,
GlobalVariable::ExternalLinkage,
ConstantArray::get(atype, ArrayRef<Constant*>(jl_sysimg_gvars)),
"jl_sysimg_gvars");
new GlobalVariable(
*jl_Module,
T_size,
true,
GlobalVariable::ExternalLinkage,
ConstantInt::get(T_size,globalUnique+1),
"jl_globalUnique");
}
static int32_t jl_assign_functionID(Function *functionObject)
{
// give the function an index in the constant lookup table
if (!imaging_mode)
return 0;
jl_sysimg_gvars.push_back(ConstantExpr::getBitCast(functionObject,T_psize));
return jl_sysimg_gvars.size();
}
static Value *julia_gv(const char *cname, void *addr)
{
// emit a GlobalVariable for a jl_value_t named "cname"
std::map<void*, jl_value_llvm>::iterator it;
// first see if there already is a GlobalVariable for this address
it = jl_value_to_llvm.find(addr);
if (it != jl_value_to_llvm.end())
return builder.CreateLoad(it->second.gv);
std::stringstream gvname;
gvname << cname << globalUnique++;
// no existing GlobalVariable, create one and store it
GlobalValue *gv = new GlobalVariable(*jl_Module, jl_pvalue_llvmt,
false, imaging_mode ? GlobalVariable::InternalLinkage : GlobalVariable::ExternalLinkage,
ConstantPointerNull::get((PointerType*)jl_pvalue_llvmt), gvname.str());
// make the pointer valid for this session
#ifdef USE_MCJIT
llvm_to_jl_value[gv] = addr;
#else
void **p = (void**)jl_ExecutionEngine->getPointerToGlobal(gv);
*p = addr;
#endif
// make the pointer valid for future sessions
jl_sysimg_gvars.push_back(ConstantExpr::getBitCast(gv, T_psize));
jl_value_llvm gv_struct;
gv_struct.gv = gv;
gv_struct.index = jl_sysimg_gvars.size();
jl_value_to_llvm[addr] = gv_struct;
return builder.CreateLoad(gv);
}
static Value *julia_gv(const char *prefix, jl_sym_t *name, jl_module_t *mod, void *addr)
{
// emit a GlobalVariable for a jl_value_t, using the prefix, name, and module to
// to create a readable name of the form prefixModA.ModB.name
size_t len = strlen(name->name)+strlen(prefix)+1;
jl_module_t *parent = mod, *prev = NULL;
while (parent != NULL && parent != prev) {
len += strlen(parent->name->name)+1;
prev = parent;
parent = parent->parent;
}
char *fullname = (char*)alloca(len);
strcpy(fullname, prefix);
len -= strlen(name->name)+1;
strcpy(fullname+len,name->name);
parent = mod;
prev = NULL;
while (parent != NULL && parent != prev) {
size_t part = strlen(parent->name->name)+1;
strcpy(fullname+len-part,parent->name->name);
fullname[len-1] = '.';
len -= part;
prev = parent;
parent = parent->parent;
}
return julia_gv(fullname, addr);
}
static Value *literal_pointer_val(jl_value_t *p)
{
// emit a pointer to any jl_value_t which will be valid across reloading code
// also, try to give it a nice name for gdb, for easy identification
if (p == NULL)
return ConstantPointerNull::get((PointerType*)jl_pvalue_llvmt);
if (!imaging_mode)
return literal_static_pointer_val(p, jl_pvalue_llvmt);
if (jl_is_datatype(p)) {
jl_datatype_t* addr = (jl_datatype_t*)p;
// DataTypes are prefixed with a +
return julia_gv("+", addr->name->name, addr->name->module, p);
}
if (jl_is_func(p)) {
jl_lambda_info_t* linfo = ((jl_function_t*)p)->linfo;
// Functions are prefixed with a -
if (linfo != NULL)
return julia_gv("-", linfo->name, linfo->module, p);
// Anonymous lambdas are prefixed with jl_method#
return julia_gv("jl_method#", p);
}
if (jl_is_lambda_info(p)) {
jl_lambda_info_t* linfo = (jl_lambda_info_t*)p;
// Type-inferred functions are prefixed with a -
return julia_gv("-", linfo->name, linfo->module, p);
}
if (jl_is_symbol(p)) {
jl_sym_t* addr = (jl_sym_t*)p;
// Symbols are prefixed with jl_sym#
return julia_gv("jl_sym#", addr, NULL, p);
}
// something else gets just a generic name
return julia_gv("jl_global#", p);
}
static Value *literal_pointer_val(jl_binding_t *p)
{
// emit a pointer to any jl_value_t which will be valid across reloading code
if (p == NULL)
return ConstantPointerNull::get((PointerType*)jl_pvalue_llvmt);
if (!imaging_mode)
return literal_static_pointer_val(p, jl_pvalue_llvmt);
// bindings are prefixed with jl_bnd#
return julia_gv("jl_bnd#", p->name, p->owner, p);
}
static Value *julia_binding_gv(jl_binding_t *b)
{
// emit a literal_pointer_val to the value field of a jl_binding_t
// binding->value are prefixed with *
Value *bv = imaging_mode ?
builder.CreateBitCast(julia_gv("*", b->name, b->owner, b), jl_ppvalue_llvmt) :
literal_static_pointer_val(b,jl_ppvalue_llvmt);
return builder.CreateGEP(bv,ConstantInt::get(T_size,
offsetof(jl_binding_t,value)/sizeof(size_t)));
}
// --- mapping between julia and llvm types ---
static Type *julia_struct_to_llvm(jl_value_t *jt);
static bool jltupleisbits(jl_value_t *jt, bool allow_unsized = true);
static Type *julia_type_to_llvm(jl_value_t *jt)
{
if (jt == (jl_value_t*)jl_bool_type) return T_int1;
if (jt == (jl_value_t*)jl_bottom_type) return T_void;
if (jl_is_tuple(jt)) {
// Represent tuples as anonymous structs
size_t ntypes = jl_tuple_len(jt);
if (ntypes == 0)
return T_void;
bool purebits = true;
bool isvector = true;
Type *type = NULL;
for (size_t i = 0; i < ntypes; ++i) {
jl_value_t *elt = jl_tupleref(jt,i);
purebits &= jltupleisbits(elt);
Type *newtype = julia_struct_to_llvm(elt);
if (type != NULL && type != newtype)
isvector = false;
type = newtype;
if (!purebits && !isvector)
break;
}
if (purebits) {
// Can't be bool due to
// http:https://llvm.org/bugs/show_bug.cgi?id=12618
if (isvector && type != T_int1 && type != T_void) {
Type *ret = NULL;
if (type->isSingleValueType() && !type->isVectorTy())
ret = VectorType::get(type,ntypes);
else
ret = ArrayType::get(type,ntypes);
return ret;
}
else {
Type **types = (Type**)alloca(ntypes*sizeof(Type*));
size_t j = 0;
for (size_t i = 0; i < ntypes; ++i) {
Type *ty = julia_struct_to_llvm(jl_tupleref(jt,i));
if (ty == T_void || ty->isEmptyTy())
continue;
types[j++] = ty;
}
return StructType::get(jl_LLVMContext,ArrayRef<Type*>(&types[0],j));
}
}
}
if (!jl_is_leaf_type(jt))
return jl_pvalue_llvmt;
if (jl_is_cpointer_type(jt)) {
Type *lt = julia_type_to_llvm(jl_tparam0(jt));
if (lt == NULL)
return NULL;
if (lt == T_void)
lt = T_int8;
return PointerType::get(lt, 0);
}
if (jl_is_bitstype(jt)) {
int nb = jl_datatype_size(jt);
if (jl_is_floattype(jt)) {
#ifndef DISABLE_FLOAT16
if (nb == 2)
return Type::getHalfTy(jl_LLVMContext);
else
#endif
if (nb == 4)
return Type::getFloatTy(jl_LLVMContext);
else if (nb == 8)
return Type::getDoubleTy(jl_LLVMContext);
else if (nb == 16)
return Type::getFP128Ty(jl_LLVMContext);
}
return Type::getIntNTy(jl_LLVMContext, nb*8);
}
if (jl_isbits(jt)) {
if (((jl_datatype_t*)jt)->size == 0) {
// TODO: come up with a representation for a 0-size value,
// and make this 0 size everywhere. as an argument, simply
// skip passing it.
return jl_pvalue_llvmt;
}
return julia_struct_to_llvm(jt);
}
return jl_pvalue_llvmt;
}
static Type *julia_struct_to_llvm(jl_value_t *jt)
{
if (jl_is_structtype(jt) && !jl_is_array_type(jt)) {
if (!jl_is_leaf_type(jt))
return NULL;
jl_datatype_t *jst = (jl_datatype_t*)jt;
if (jst->struct_decl == NULL) {
size_t ntypes = jl_tuple_len(jst->types);
if (ntypes == 0)
return T_void;
StructType *structdecl = StructType::create(getGlobalContext(), jst->name->name->name);
jst->struct_decl = structdecl;
std::vector<Type *> latypes(0);
size_t i;
for(i = 0; i < ntypes; i++) {
jl_value_t *ty = jl_tupleref(jst->types, i);
Type *lty;
if (jst->fields[i].isptr)
lty = jl_pvalue_llvmt;
else
lty = ty==(jl_value_t*)jl_bool_type ? T_int8 : julia_type_to_llvm(ty);
latypes.push_back(lty);
}
structdecl->setBody(latypes);
}
return (Type*)jst->struct_decl;
}
return julia_type_to_llvm(jt);
}
// NOTE: llvm cannot express all julia types (for example unsigned),
// so this is an approximation. it's only correct if the associated LLVM
// value is not tagged with our value name hack.
// boxed(v) below gets the correct type.
static jl_value_t *llvm_type_to_julia(Type *t, bool throw_error)
{
if (t == T_int1) return (jl_value_t*)jl_bool_type;
if (t == T_int8) return (jl_value_t*)jl_int8_type;
if (t == T_int16) return (jl_value_t*)jl_int16_type;
if (t == T_int32) return (jl_value_t*)jl_int32_type;
if (t == T_int64) return (jl_value_t*)jl_int64_type;
if (t == T_float32) return (jl_value_t*)jl_float32_type;
if (t == T_float64) return (jl_value_t*)jl_float64_type;
if (t == T_void) return (jl_value_t*)jl_bottom_type;
if (t->isEmptyTy()) return (jl_value_t*)jl_nothing->type;
if (t == jl_pvalue_llvmt)
return (jl_value_t*)jl_any_type;
if (t->isPointerTy()) {
jl_value_t *elty = llvm_type_to_julia(t->getContainedType(0),
throw_error);
if (elty != NULL) {
return (jl_value_t*)jl_apply_type((jl_value_t*)jl_pointer_type,
jl_tuple1(elty));
}
}
if (throw_error) {
jl_error("cannot convert type to a julia type");
}
return NULL;
}
static bool is_structtype_all_pointers(jl_datatype_t *dt)
{
jl_tuple_t *t = dt->types;
size_t i, l = jl_tuple_len(t);
for(i=0; i < l; i++) {
if (!dt->fields[i].isptr)
return false;
}
return true;
}
static bool is_tupletype_homogeneous(jl_tuple_t *t)
{
size_t i, l = jl_tuple_len(t);
if (l > 0) {
jl_value_t *t0 = jl_tupleref(t, 0);
if (!jl_is_leaf_type(t0))
return false;
for(i=1; i < l; i++) {
if (!jl_types_equal(t0, jl_tupleref(t,i)))
return false;
}
}
return true;
}
// --- scheme for tagging llvm values with julia types using metadata ---
static std::map<int, jl_value_t*> typeIdToType;
static jl_array_t *typeToTypeId;
static int cur_type_id = 1;
static int jl_type_to_typeid(jl_value_t *t)
{
jl_value_t *id = jl_eqtable_get(typeToTypeId, t, NULL);
if (id == NULL) {
int mine = cur_type_id++;
if (mine > 65025)
jl_error("internal compiler error: too many bits types");
JL_GC_PUSH1(&id);
id = jl_box_long(mine);
jl_eqtable_put(typeToTypeId, t, id);
typeIdToType[mine] = t;
JL_GC_POP();
return mine;
}
return jl_unbox_long(id);
}
static jl_value_t *jl_typeid_to_type(int i)
{
std::map<int, jl_value_t*>::iterator it = typeIdToType.find(i);
if (it == typeIdToType.end()) {
jl_error("internal compiler error: invalid type id");
}
return (*it).second;
}
static bool has_julia_type(Value *v)
{
Instruction *inst = (dyn_cast<Instruction>(v));
return (inst != NULL) &&
(inst->getMetadata("julia_type")!=NULL);
}
static jl_value_t *julia_type_of_without_metadata(Value *v, bool err=true)
{
if (dyn_cast<AllocaInst>(v) != NULL ||
dyn_cast<GetElementPtrInst>(v) != NULL) {
// an alloca always has llvm type pointer
return llvm_type_to_julia(v->getType()->getContainedType(0), err);
}
return llvm_type_to_julia(v->getType(), err);
}
static jl_value_t *julia_type_of(Value *v)
{
MDNode *mdn;
if (dyn_cast<Instruction>(v) == NULL ||
(mdn = ((Instruction*)v)->getMetadata("julia_type")) == NULL) {
return julia_type_of_without_metadata(v, true);
}
MDString *md = (MDString*)mdn->getOperand(0);
const unsigned char *vts = (const unsigned char*)md->getString().data();
int id = (vts[0]-1) + (vts[1]-1)*255;
return jl_typeid_to_type(id);
}
static Value *NoOpInst(Value *v)
{
v = SelectInst::Create(ConstantInt::get(T_int1,1), v, v);
builder.Insert((Instruction*)v);
return v;
}
static Value *mark_julia_type(Value *v, jl_value_t *jt)
{
if (jt == (jl_value_t*)jl_any_type || v->getType()==jl_pvalue_llvmt)
return v;
if (has_julia_type(v)) {
if (julia_type_of(v) == jt)
return v;
}
else if (julia_type_of_without_metadata(v,false) == jt) {
return v;
}
if (dyn_cast<Instruction>(v) == NULL)
v = NoOpInst(v);
assert(dyn_cast<Instruction>(v));
char name[3];
int id = jl_type_to_typeid(jt);
// store id as base-255 to avoid NUL
name[0] = (id%255)+1;
name[1] = (id/255)+1;
name[2] = '\0';
MDString *md = MDString::get(jl_LLVMContext, name);
MDNode *mdn = MDNode::get(jl_LLVMContext, ArrayRef<Value*>(md));
((Instruction*)v)->setMetadata("julia_type", mdn);
return v;
}
// --- generating various error checks ---
static jl_value_t *llvm_type_to_julia(Type *t, bool err=true);
static Value *emit_typeof(Value *p)
{
// given p, a jl_value_t*, compute its type tag
if (p->getType() == jl_pvalue_llvmt) {
Value *tt = builder.CreateBitCast(p, jl_ppvalue_llvmt);
tt = builder.
CreateLoad(builder.CreateGEP(tt,ConstantInt::get(T_size,0)),
false);
#ifdef OVERLAP_TUPLE_LEN
tt = builder.
CreateIntToPtr(builder.
CreateAnd(builder.CreatePtrToInt(tt, T_int64),
ConstantInt::get(T_int64,0x000ffffffffffffe)),
jl_pvalue_llvmt);
#endif
return tt;
}
return literal_pointer_val(julia_type_of(p));
}
static void just_emit_error(const std::string &txt, jl_codectx_t *ctx)
{
Value *zeros[2] = { ConstantInt::get(T_int32, 0),
ConstantInt::get(T_int32, 0) };
builder.CreateCall(prepare_call(jlerror_func),
builder.CreateGEP(stringConst(txt),
ArrayRef<Value*>(zeros)));
}
static void emit_error(const std::string &txt, jl_codectx_t *ctx)
{
just_emit_error(txt, ctx);
builder.CreateUnreachable();
BasicBlock *cont = BasicBlock::Create(getGlobalContext(),"after_error",ctx->f);
builder.SetInsertPoint(cont);
}
static void error_unless(Value *cond, const std::string &msg, jl_codectx_t *ctx)
{
BasicBlock *failBB = BasicBlock::Create(getGlobalContext(),"fail",ctx->f);
BasicBlock *passBB = BasicBlock::Create(getGlobalContext(),"pass");
builder.CreateCondBr(cond, passBB, failBB);
builder.SetInsertPoint(failBB);
just_emit_error(msg, ctx);
builder.CreateUnreachable();
ctx->f->getBasicBlockList().push_back(passBB);
builder.SetInsertPoint(passBB);
}
static void raise_exception_unless(Value *cond, Value *exc, jl_codectx_t *ctx)
{
BasicBlock *failBB = BasicBlock::Create(getGlobalContext(),"fail",ctx->f);
BasicBlock *passBB = BasicBlock::Create(getGlobalContext(),"pass");
builder.CreateCondBr(cond, passBB, failBB);
builder.SetInsertPoint(failBB);
builder.CreateCall2(prepare_call(jlthrow_line_func), exc,
ConstantInt::get(T_int32, ctx->lineno));
builder.CreateUnreachable();
ctx->f->getBasicBlockList().push_back(passBB);
builder.SetInsertPoint(passBB);
}
static void raise_exception_unless(Value *cond, GlobalVariable *exc,
jl_codectx_t *ctx)
{
raise_exception_unless(cond, (Value*)builder.CreateLoad(exc, false), ctx);
}
static void raise_exception_if(Value *cond, Value *exc, jl_codectx_t *ctx)
{
raise_exception_unless(builder.CreateXor(cond, ConstantInt::get(T_int1,-1)),
exc, ctx);
}
static void raise_exception_if(Value *cond, GlobalVariable *exc,
jl_codectx_t *ctx)
{
raise_exception_if(cond, (Value*)builder.CreateLoad(exc, false), ctx);
}
static void null_pointer_check(Value *v, jl_codectx_t *ctx)
{
raise_exception_unless(builder.CreateICmpNE(v,Constant::getNullValue(v->getType())),
prepare_global(jlundeferr_var), ctx);
}
static Value *boxed(Value *v, jl_codectx_t *ctx, jl_value_t *jt=NULL);
static void emit_type_error(Value *x, jl_value_t *type, const std::string &msg,
jl_codectx_t *ctx)
{
Value *zeros[2] = { ConstantInt::get(T_int32, 0),
ConstantInt::get(T_int32, 0) };
Value *fname_val = builder.CreateGEP(stringConst(ctx->funcName),
ArrayRef<Value*>(zeros));
Value *msg_val = builder.CreateGEP(stringConst(msg),
ArrayRef<Value*>(zeros));
builder.CreateCall4(prepare_call(jltypeerror_func),
fname_val, msg_val,
literal_pointer_val(type), boxed(x,ctx));
}
static void emit_typecheck(Value *x, jl_value_t *type, const std::string &msg,
jl_codectx_t *ctx)
{
Value *istype =
builder.CreateICmpEQ(emit_typeof(x), literal_pointer_val(type));
BasicBlock *failBB = BasicBlock::Create(getGlobalContext(),"fail",ctx->f);
BasicBlock *passBB = BasicBlock::Create(getGlobalContext(),"pass");
builder.CreateCondBr(istype, passBB, failBB);
builder.SetInsertPoint(failBB);
emit_type_error(x, type, msg, ctx);
builder.CreateBr(passBB);
ctx->f->getBasicBlockList().push_back(passBB);
builder.SetInsertPoint(passBB);
}
#define CHECK_BOUNDS 1
static Value *emit_bounds_check(Value *i, Value *len, jl_codectx_t *ctx)
{
Value *im1 = builder.CreateSub(i, ConstantInt::get(T_size, 1));
#if CHECK_BOUNDS==1
if (ctx->boundsCheck.empty() || ctx->boundsCheck.back()==true) {
Value *ok = builder.CreateICmpULT(im1, len);
raise_exception_unless(ok, prepare_global(jlboundserr_var), ctx);
}
#endif
return im1;
}
static void emit_func_check(Value *x, jl_codectx_t *ctx)
{
Value *xty = emit_typeof(x);
Value *isfunc =
builder.
CreateOr(builder.
CreateICmpEQ(xty,
literal_pointer_val((jl_value_t*)jl_function_type)),
builder.
CreateICmpEQ(xty,
literal_pointer_val((jl_value_t*)jl_datatype_type)));
BasicBlock *elseBB1 = BasicBlock::Create(getGlobalContext(),"notf", ctx->f);
BasicBlock *mergeBB1 = BasicBlock::Create(getGlobalContext(),"isf");
builder.CreateCondBr(isfunc, mergeBB1, elseBB1);
builder.SetInsertPoint(elseBB1);
emit_type_error(x, (jl_value_t*)jl_function_type, "apply", ctx);
builder.CreateBr(mergeBB1);
ctx->f->getBasicBlockList().push_back(mergeBB1);
builder.SetInsertPoint(mergeBB1);
}
// --- loading and storing ---
static Value *emit_nthptr_addr(Value *v, size_t n)
{
return builder.CreateGEP(builder.CreateBitCast(v, jl_ppvalue_llvmt),
ConstantInt::get(T_size, n));
}
static Value *emit_nthptr_addr(Value *v, Value *idx)
{
return builder.CreateGEP(builder.CreateBitCast(v, jl_ppvalue_llvmt), idx);
}
static Value *emit_nthptr(Value *v, size_t n)
{
// p = (jl_value_t**)v; p[n]
Value *vptr = emit_nthptr_addr(v, n);
return builder.CreateLoad(vptr, false);
}
static Value *emit_nthptr(Value *v, Value *idx)
{
// p = (jl_value_t**)v; p[n]
Value *vptr = emit_nthptr_addr(v, idx);
return builder.CreateLoad(vptr, false);
}
static Value *typed_load(Value *ptr, Value *idx_0based, jl_value_t *jltype,
jl_codectx_t *ctx)
{
Type *elty = julia_type_to_llvm(jltype);
assert(elty != NULL);
bool isbool=false;
if (elty==T_int1) { elty = T_int8; isbool=true; }
Value *data;
if (ptr->getType()->getContainedType(0) != elty)
data = builder.CreateBitCast(ptr, PointerType::get(elty, 0));
else
data = ptr;
Value *elt = builder.CreateLoad(builder.CreateGEP(data, idx_0based), false);
if (elty == jl_pvalue_llvmt) {
null_pointer_check(elt, ctx);
}
if (isbool)
return builder.CreateTrunc(elt, T_int1);
return mark_julia_type(elt, jltype);
}
static Value *emit_unbox(Type *to, Value *x, jl_value_t *jt);
static Value *typed_store(Value *ptr, Value *idx_0based, Value *rhs,
jl_value_t *jltype, jl_codectx_t *ctx)
{
Type *elty = julia_type_to_llvm(jltype);
assert(elty != NULL);
if (elty==T_int1) { elty = T_int8; }
if (jl_isbits(jltype) && ((jl_datatype_t*)jltype)->size > 0)
rhs = emit_unbox(elty, rhs, jltype);
else
rhs = boxed(rhs,ctx);
Value *data;
if (ptr->getType()->getContainedType(0) != elty)
data = builder.CreateBitCast(ptr, PointerType::get(elty, 0));
else
data = ptr;
return builder.CreateStore(rhs, builder.CreateGEP(data, idx_0based));
}
// --- convert boolean value to julia ---
static Value *julia_bool(Value *cond)
{
return builder.CreateSelect(cond,
literal_pointer_val(jl_true),
literal_pointer_val(jl_false));
}
// --- get the inferred type of an AST node ---
static jl_value_t *static_eval(jl_value_t *ex, jl_codectx_t *ctx, bool sparams=true,
bool allow_alloc=true);
static inline jl_module_t *topmod(jl_codectx_t *ctx)
{
return jl_base_relative_to(ctx->module);
}
static jl_value_t *expr_type(jl_value_t *e, jl_codectx_t *ctx)
{
if (jl_is_expr(e))
return ((jl_expr_t*)e)->etype;
if (jl_is_symbolnode(e))
return jl_symbolnode_type(e);
if (jl_is_quotenode(e))
return (jl_value_t*)jl_typeof(jl_fieldref(e,0));
if (jl_is_lambda_info(e))
return (jl_value_t*)jl_function_type;
if (jl_is_getfieldnode(e)) {
jl_value_t *v = static_eval(e, ctx);
if (v == NULL)
return jl_getfieldnode_type(e);
e = v;
goto type_of_constant;
}
if (jl_is_topnode(e)) {
e = jl_fieldref(e,0);
jl_binding_t *b = jl_get_binding(topmod(ctx), (jl_sym_t*)e);
if (!b || !b->value)
return jl_top_type;
if (b->constp) {
e = b->value;
goto type_of_constant;
}
else {
return (jl_value_t*)jl_any_type;
}
}
if (jl_is_symbol(e)) {
if (jl_is_symbol(e)) {
if (is_global((jl_sym_t*)e, ctx)) {
// look for static parameter
for(size_t i=0; i < jl_tuple_len(ctx->sp); i+=2) {
assert(jl_is_symbol(jl_tupleref(ctx->sp, i)));
if (e == jl_tupleref(ctx->sp, i)) {
e = jl_tupleref(ctx->sp, i+1);
goto type_of_constant;
}
}
}
else {
return (jl_value_t*)jl_any_type;
}
}
jl_binding_t *b = jl_get_binding(ctx->module, (jl_sym_t*)e);
if (!b || !b->value)
return jl_top_type;
if (b->constp)
e = b->value;
else
return (jl_value_t*)jl_any_type;
}
type_of_constant:
if (jl_is_datatype(e) || jl_is_uniontype(e) || jl_is_typector(e))
return (jl_value_t*)jl_wrap_Type(e);
return (jl_value_t*)jl_typeof(e);
}
// --- accessing the representations of built-in data types ---
static Value *emit_tuplelen(Value *t,jl_value_t *jt)
{
if (t == NULL)
return ConstantInt::get(T_size,0);
Type *ty = t->getType();
if (ty == jl_pvalue_llvmt) { //boxed
#ifdef OVERLAP_TUPLE_LEN
Value *lenbits = emit_nthptr(t, (size_t)0);
return builder.CreateLShr(builder.CreatePtrToInt(lenbits, T_int64),
ConstantInt::get(T_int32, 52));
#else
Value *lenbits = emit_nthptr(t, 1);
return builder.CreatePtrToInt(lenbits, T_size);
#endif
}
else { //unboxed
return ConstantInt::get(T_size,jl_tuple_len(jt));
}
}
static Value *emit_tupleset(Value *tuple, Value *ival, Value *x, jl_value_t *jt, jl_codectx_t *ctx)
{
if (tuple == NULL) {
// A typecheck must have caught this one
//builder.CreateUnreachable();
return NULL;
}
Type *ty = tuple->getType();
if (ty == jl_pvalue_llvmt) { //boxed
#ifdef OVERLAP_TUPLE_LEN
Value *slot = builder.CreateGEP(builder.CreateBitCast(tuple, jl_ppvalue_llvmt),
ival);
#else
Value *slot = builder.CreateGEP(builder.CreateBitCast(tuple, jl_ppvalue_llvmt),
builder.CreateAdd(ConstantInt::get(T_size,1),ival));
#endif
builder.CreateStore(x,slot);
return tuple;
}
ConstantInt *idx = dyn_cast<ConstantInt>(ival);
assert(idx != NULL && "tuplesets must use constant indices");
unsigned ci = (unsigned)idx->getZExtValue()-1;
if (ty->isVectorTy()) {
return mark_julia_type(builder.CreateInsertElement(tuple,x,ConstantInt::get(T_int32,ci)), jt);
}
size_t i,j,n = jl_tuple_len(jt);
for (i = 0, j = 0; i<n; i++) {
Type *ty = julia_struct_to_llvm(jl_tupleref(jt,i));
if (ty == T_void || ty->isEmptyTy()) {
if (ci == i) {
return tuple;
}
}
else {