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cgutils.cpp
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cgutils.cpp
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// This file is a part of Julia. License is MIT: https://julialang.org/license
// utility procedures used in code generation
static Instruction *tbaa_decorate(MDNode *md, Instruction *load_or_store)
{
load_or_store->setMetadata( llvm::LLVMContext::MD_tbaa, md );
return load_or_store;
}
static Function *function_proto(Function *F, Module *M = nullptr)
{
// Copy the declaration characteristics of the Function (not the body)
Function *NewF = Function::Create(F->getFunctionType(),
Function::ExternalLinkage,
F->getName(),
M);
// Declarations are not allowed to have personality routines, but
// copyAttributesFrom sets them anyway. Temporarily unset the personality
// routine from `F`, since copying it and then resetting is more expensive
// as well as introducing an extra use from this unowned function, which
// can cause crashes in the LLVMContext's global destructor.
llvm::Constant *OldPersonalityFn = nullptr;
if (F->hasPersonalityFn()) {
OldPersonalityFn = F->getPersonalityFn();
F->setPersonalityFn(nullptr);
}
// FunctionType does not include any attributes. Copy them over manually
// as codegen may make decisions based on the presence of certain attributes
NewF->copyAttributesFrom(F);
if (OldPersonalityFn)
F->setPersonalityFn(OldPersonalityFn);
// DLLImport only needs to be set for the shadow module
// it just gets annoying in the JIT
NewF->setDLLStorageClass(GlobalValue::DefaultStorageClass);
return NewF;
}
#define prepare_call(Callee) prepare_call_in(jl_Module, (Callee))
static Value *prepare_call_in(Module *M, Value *Callee)
{
if (Function *F = dyn_cast<Function>(Callee)) {
GlobalValue *local = M->getNamedValue(Callee->getName());
if (!local) {
local = function_proto(F, M);
}
return local;
}
return Callee;
}
static Value *maybe_decay_untracked(IRBuilder<> &irbuilder, Value *V)
{
if (V->getType() == T_pjlvalue)
return irbuilder.CreateAddrSpaceCast(V, T_prjlvalue);
else if (V->getType() == T_ppjlvalue)
return irbuilder.CreateBitCast(V, T_pprjlvalue);
return V;
}
static Constant *maybe_decay_untracked(IRBuilder<> &irbuilder, Constant *C)
{
if (C->getType() == T_pjlvalue)
return ConstantExpr::getAddrSpaceCast(C, T_prjlvalue);
else if (C->getType() == T_ppjlvalue)
return ConstantExpr::getBitCast(C, T_pprjlvalue);
return C;
}
static Value *decay_derived(IRBuilder<> &irbuilder, Value *V)
{
Type *T = V->getType();
if (cast<PointerType>(T)->getAddressSpace() == AddressSpace::Derived)
return V;
// Once llvm deletes pointer element types, we won't need it here any more either.
Type *NewT = PointerType::get(cast<PointerType>(T)->getElementType(), AddressSpace::Derived);
return irbuilder.CreateAddrSpaceCast(V, NewT);
}
static Value *mark_callee_rooted(IRBuilder<> &irbuilder, Value *V)
{
assert(V->getType() == T_pjlvalue || V->getType() == T_prjlvalue);
return irbuilder.CreateAddrSpaceCast(V,
PointerType::get(T_jlvalue, AddressSpace::CalleeRooted));
}
#define maybe_decay_untracked(V) maybe_decay_untracked(ctx.builder, (V))
#define maybe_decay_untracked(V) maybe_decay_untracked(ctx.builder, (V))
#define decay_derived(V) decay_derived(ctx.builder, (V))
#define mark_callee_rooted(V) mark_callee_rooted(ctx.builder, (V))
// --- language feature checks ---
// branch on whether a language feature is enabled or not
#define JL_FEAT_TEST(ctx, feature) ((ctx).params->feature)
// require a language feature to be enabled
#define JL_FEAT_REQUIRE(ctx, feature) \
if (!JL_FEAT_TEST(ctx, feature)) \
jl_errorf("%s for %s:%d requires the " #feature " language feature, which is disabled", \
__FUNCTION__, (ctx).file.str().c_str(), *(ctx).line);
// --- hook checks ---
#define JL_HOOK_TEST(params,hook) ((params)->hooks.hook != jl_nothing)
#define JL_HOOK_CALL(params,hook,argc,...) \
_hook_call<argc>((params)->hooks.hook, {{__VA_ARGS__}});
template<int N>
static inline void _hook_call(jl_value_t *hook, std::array<jl_value_t*,N> args) {
jl_value_t **argv;
JL_GC_PUSHARGS(argv, N+1);
argv[0] = hook;
for (int i = 0; i < N; i++)
argv[i+1] = args[i];
jl_apply(argv, N+1);
JL_GC_POP();
}
// --- string constants ---
static StringMap<GlobalVariable*> stringConstants;
static Value *stringConstPtr(IRBuilder<> &irbuilder, const std::string &txt)
{
StringRef ctxt(txt.c_str(), strlen(txt.c_str()) + 1);
StringMap<GlobalVariable*>::iterator pooledval =
stringConstants.insert(std::pair<StringRef, GlobalVariable*>(ctxt, NULL)).first;
StringRef pooledtxt = pooledval->getKey();
if (imaging_mode) {
if (pooledval->second == NULL) {
static int strno = 0;
std::stringstream ssno;
ssno << "_j_str" << strno++;
GlobalVariable *gv = get_pointer_to_constant(
ConstantDataArray::get(jl_LLVMContext,
ArrayRef<unsigned char>(
(const unsigned char*)pooledtxt.data(),
pooledtxt.size())),
ssno.str(),
*shadow_output);
pooledval->second = gv;
jl_ExecutionEngine->addGlobalMapping(gv, (void*)(uintptr_t)pooledtxt.data());
}
GlobalVariable *v = prepare_global_in(jl_builderModule(irbuilder), pooledval->second);
Value *zero = ConstantInt::get(Type::getInt32Ty(jl_LLVMContext), 0);
Value *Args[] = { zero, zero };
return irbuilder.CreateInBoundsGEP(v->getValueType(), v, Args);
}
else {
Value *v = ConstantExpr::getIntToPtr(
ConstantInt::get(T_size, (uintptr_t)pooledtxt.data()),
T_pint8);
return v;
}
}
// --- Debug info ---
static DIType *julia_type_to_di(jl_value_t *jt, DIBuilder *dbuilder, bool isboxed = false)
{
if (isboxed || !jl_is_datatype(jt))
return jl_pvalue_dillvmt;
jl_datatype_t *jdt = (jl_datatype_t*)jt;
// always return the boxed representation for types with hidden content
if (jl_is_abstracttype(jt) || jl_is_array_type(jt) ||
jt == (jl_value_t*)jl_sym_type || jt == (jl_value_t*)jl_module_type ||
jt == (jl_value_t*)jl_simplevector_type || jt == (jl_value_t*)jl_datatype_type ||
jt == (jl_value_t*)jl_method_instance_type)
return jl_pvalue_dillvmt;
if (jdt->ditype != NULL) {
DIType* t = (DIType*)jdt->ditype;
return t;
}
if (jl_is_primitivetype(jt)) {
uint64_t SizeInBits = jl_datatype_nbits(jdt);
#if JL_LLVM_VERSION >= 40000
llvm::DIType *t = dbuilder->createBasicType(
jl_symbol_name(jdt->name->name),
SizeInBits,
llvm::dwarf::DW_ATE_unsigned);
jdt->ditype = t;
return t;
#else
llvm::DIType *t = dbuilder->createBasicType(
jl_symbol_name(jdt->name->name),
SizeInBits,
8 * jl_datatype_align(jdt),
llvm::dwarf::DW_ATE_unsigned);
jdt->ditype = t;
return t;
#endif
}
if (jl_is_structtype(jt) && jdt->layout) {
size_t ntypes = jl_datatype_nfields(jdt);
const char *tname = jl_symbol_name(jdt->name->name);
std::stringstream unique_name;
unique_name << tname << "_" << globalUnique++;
llvm::DICompositeType *ct = dbuilder->createStructType(
NULL, // Scope
tname, // Name
NULL, // File
0, // LineNumber
jl_datatype_nbits(jdt), // SizeInBits
8 * jl_datatype_align(jdt), // AlignInBits
DIFlagZero, // Flags
NULL, // DerivedFrom
DINodeArray(), // Elements
dwarf::DW_LANG_Julia, // RuntimeLanguage
nullptr, // VTableHolder
unique_name.str() // UniqueIdentifier
);
jdt->ditype = ct;
std::vector<llvm::Metadata*> Elements;
for (unsigned i = 0; i < ntypes; i++)
Elements.push_back(julia_type_to_di(jl_svecref(jdt->types, i), dbuilder, false));
dbuilder->replaceArrays(ct, dbuilder->getOrCreateArray(ArrayRef<Metadata*>(Elements)));
return ct;
}
jdt->ditype = dbuilder->createTypedef(jl_pvalue_dillvmt,
jl_symbol_name(jdt->name->name), NULL, 0, NULL);
return (llvm::DIType*)jdt->ditype;
}
static Value *emit_pointer_from_objref(jl_codectx_t &ctx, Value *V)
{
unsigned AS = cast<PointerType>(V->getType())->getAddressSpace();
if (AS != AddressSpace::Tracked && AS != AddressSpace::Derived)
return ctx.builder.CreateBitCast(V, T_pjlvalue);
V = ctx.builder.CreateBitCast(decay_derived(V),
PointerType::get(T_jlvalue, AddressSpace::Derived));
CallInst *Call = ctx.builder.CreateCall(prepare_call(pointer_from_objref_func), V);
#if JL_LLVM_VERSION >= 50000
Call->addAttribute(AttributeList::FunctionIndex, Attribute::ReadNone);
#else
Call->addAttribute(AttributeSet::FunctionIndex, Attribute::ReadNone);
#endif
return Call;
}
// --- emitting pointers directly into code ---
static Constant *literal_static_pointer_val(jl_codectx_t &ctx, const void *p, Type *T = T_pjlvalue)
{
// 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 Value *julia_pgv(jl_codectx_t &ctx, const char *cname, void *addr)
{
// emit a GlobalVariable for a jl_value_t named "cname"
return jl_get_global_for(cname, addr, jl_Module);
}
static Value *julia_pgv(jl_codectx_t &ctx, 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(jl_symbol_name(name))+strlen(prefix)+1;
jl_module_t *parent = mod, *prev = NULL;
while (parent != NULL && parent != prev) {
len += strlen(jl_symbol_name(parent->name))+1;
prev = parent;
parent = parent->parent;
}
char *fullname = (char*)alloca(len);
strcpy(fullname, prefix);
int skipfirst = jl_symbol_name(name)[0] == '@';
len -= strlen(jl_symbol_name(name)) + 1 - skipfirst;
strcpy(fullname + len, jl_symbol_name(name) + skipfirst);
parent = mod;
prev = NULL;
while (parent != NULL && parent != prev) {
size_t part = strlen(jl_symbol_name(parent->name))+1-skipfirst;
strcpy(fullname+len-part,jl_symbol_name(parent->name)+skipfirst);
fullname[len-1] = '.';
len -= part;
prev = parent;
parent = parent->parent;
}
return julia_pgv(ctx, fullname, addr);
}
static GlobalVariable *julia_const_gv(jl_value_t *val);
static Value *literal_pointer_val_slot(jl_codectx_t &ctx, jl_value_t *p)
{
// emit a pointer to a jl_value_t* which will allow it to be valid across reloading code
// also, try to give it a nice name for gdb, for easy identification
if (!imaging_mode) {
Module *M = jl_Module;
GlobalVariable *gv = new GlobalVariable(
*M, T_pjlvalue, true, GlobalVariable::PrivateLinkage,
literal_static_pointer_val(ctx, p));
gv->setUnnamedAddr(GlobalValue::UnnamedAddr::Global);
return gv;
}
if (GlobalVariable *gv = julia_const_gv(p)) {
// if this is a known object, use the existing GlobalValue
return prepare_global(gv);
}
if (jl_is_datatype(p)) {
jl_datatype_t *addr = (jl_datatype_t*)p;
// DataTypes are prefixed with a +
return julia_pgv(ctx, "+", addr->name->name, addr->name->module, p);
}
if (jl_is_method(p)) {
jl_method_t *m = (jl_method_t*)p;
// functions are prefixed with a -
return julia_pgv(ctx, "-", m->name, m->module, p);
}
if (jl_is_method_instance(p)) {
jl_method_instance_t *linfo = (jl_method_instance_t*)p;
// Type-inferred functions are also prefixed with a -
if (jl_is_method(linfo->def.method))
return julia_pgv(ctx, "-", linfo->def.method->name, linfo->def.method->module, p);
}
if (jl_is_symbol(p)) {
jl_sym_t *addr = (jl_sym_t*)p;
// Symbols are prefixed with jl_sym#
return julia_pgv(ctx, "jl_sym#", addr, NULL, p);
}
// something else gets just a generic name
return julia_pgv(ctx, "jl_global#", p);
}
static Value *literal_pointer_val(jl_codectx_t &ctx, jl_value_t *p)
{
if (p == NULL)
return V_null;
if (!imaging_mode)
return literal_static_pointer_val(ctx, p);
Value *pgv = literal_pointer_val_slot(ctx, p);
return tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(T_pjlvalue, pgv));
}
static Value *literal_pointer_val(jl_codectx_t &ctx, jl_binding_t *p)
{
// emit a pointer to any jl_value_t which will be valid across reloading code
if (p == NULL)
return V_null;
if (!imaging_mode)
return literal_static_pointer_val(ctx, p);
// bindings are prefixed with jl_bnd#
Value *pgv = julia_pgv(ctx, "jl_bnd#", p->name, p->owner, p);
return tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(T_pjlvalue, pgv));
}
// bitcast a value, but preserve its address space when dealing with pointer types
static Value *emit_bitcast(jl_codectx_t &ctx, Value *v, Type *jl_value)
{
if (isa<PointerType>(jl_value) &&
v->getType()->getPointerAddressSpace() != jl_value->getPointerAddressSpace()) {
// Cast to the proper address space
Type *jl_value_addr =
PointerType::get(cast<PointerType>(jl_value)->getElementType(),
v->getType()->getPointerAddressSpace());
return ctx.builder.CreateBitCast(v, jl_value_addr);
}
else {
return ctx.builder.CreateBitCast(v, jl_value);
}
}
static Value *julia_binding_gv(jl_codectx_t &ctx, Value *bv)
{
Value *offset = ConstantInt::get(T_size, offsetof(jl_binding_t, value) / sizeof(size_t));
return ctx.builder.CreateGEP(bv, offset);
}
static Value *julia_binding_gv(jl_codectx_t &ctx, 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;
if (imaging_mode)
bv = emit_bitcast(ctx,
tbaa_decorate(tbaa_const,
ctx.builder.CreateLoad(T_pjlvalue, julia_pgv(ctx, "*", b->name, b->owner, b))),
T_pprjlvalue);
else
bv = ConstantExpr::getBitCast(literal_static_pointer_val(ctx, b), T_pprjlvalue);
return julia_binding_gv(ctx, bv);
}
// --- mapping between julia and llvm types ---
static Type *julia_struct_to_llvm(jl_value_t *jt, jl_unionall_t *ua_env, bool *isboxed);
extern "C" {
JL_DLLEXPORT Type *julia_type_to_llvm(jl_value_t *jt, bool *isboxed)
{
// this function converts a Julia Type into the equivalent LLVM type
if (isboxed) *isboxed = false;
if (jt == (jl_value_t*)jl_bottom_type)
return T_void;
if (jl_is_leaf_type(jt)) {
if ((jl_is_primitivetype(jt) || jl_isbits(jt))) {
if (jl_datatype_nbits(jt) == 0)
return T_void;
Type *t = julia_struct_to_llvm(jt, NULL, isboxed);
assert(t != NULL);
return t;
}
}
if (isboxed) *isboxed = true;
return T_pjlvalue;
}
}
// converts a julia bitstype into the equivalent LLVM bitstype
static Type *bitstype_to_llvm(jl_value_t *bt)
{
assert(jl_is_primitivetype(bt));
if (bt == (jl_value_t*)jl_bool_type)
return T_int8;
if (bt == (jl_value_t*)jl_long_type)
return T_size;
if (bt == (jl_value_t*)jl_float32_type)
return T_float32;
if (bt == (jl_value_t*)jl_float64_type)
return T_float64;
if (jl_is_cpointer_type(bt)) {
Type *lt = julia_type_to_llvm(jl_tparam0(bt));
if (lt == T_void)
return T_pint8;
return PointerType::get(lt, 0);
}
int nb = jl_datatype_size(bt);
return Type::getIntNTy(jl_LLVMContext, nb * 8);
}
// compute whether all leaf subtypes of this type have the same layout
// (which is conservatively approximated here by asking whether the types of any of the
// fields depend on any of the parameters of the containing type)
static bool julia_struct_has_layout(jl_datatype_t *dt, jl_unionall_t *ua)
{
if (dt->layout || dt->struct_decl || jl_is_primitivetype(dt) || jl_isbits(dt))
return true;
if (ua) {
size_t i, ntypes = jl_svec_len(dt->types);
for (i = 0; i < ntypes; i++) {
jl_value_t *ty = jl_svecref(dt->types, i);
if (jl_has_typevar_from_unionall(ty, ua))
return false;
}
}
return true;
}
static Type *julia_struct_to_llvm(jl_value_t *jt, jl_unionall_t *ua, bool *isboxed)
{
// this function converts a Julia Type into the equivalent LLVM struct
// use this where C-compatible (unboxed) structs are desired
// use julia_type_to_llvm directly when you want to preserve Julia's type semantics
if (isboxed) *isboxed = false;
if (jt == (jl_value_t*)jl_bottom_type)
return T_void;
if (jl_is_primitivetype(jt))
return bitstype_to_llvm(jt);
bool isTuple = jl_is_tuple_type(jt);
jl_datatype_t *jst = (jl_datatype_t*)jt;
if (jl_is_structtype(jt) && !(jst->layout && jl_is_layout_opaque(jst->layout))) {
if (jst->struct_decl == NULL) {
size_t i, ntypes = jl_svec_len(jst->types);
if (ntypes == 0 || (jst->layout && jl_datatype_nbits(jst) == 0))
return T_void;
if (!julia_struct_has_layout(jst, ua))
return NULL;
StructType *structdecl;
if (!isTuple) {
structdecl = StructType::create(jl_LLVMContext, jl_symbol_name(jst->name->name));
jst->struct_decl = structdecl;
}
std::vector<Type*> latypes(0);
bool isarray = true;
bool isvector = true;
jl_value_t *jlasttype = NULL;
Type *lasttype = NULL;
bool allghost = true;
for (i = 0; i < ntypes; i++) {
jl_value_t *ty = jl_svecref(jst->types, i);
if (jlasttype != NULL && ty != jlasttype)
isvector = false;
jlasttype = ty;
bool isptr;
if (jst->layout)
isptr = jl_field_isptr(jst, i);
else // compute what jl_compute_field_offsets would say
isptr = jl_isbits(ty) && jl_is_leaf_type(ty) && ((jl_datatype_t*)ty)->layout;
Type *lty;
if (isptr)
lty = T_pjlvalue;
else if (ty == (jl_value_t*)jl_bool_type)
lty = T_int8;
else
lty = julia_type_to_llvm(ty);
if (lasttype != NULL && lasttype != lty)
isarray = false;
lasttype = lty;
if (type_is_ghost(lty))
lty = NoopType;
else
allghost = false;
latypes.push_back(lty);
}
if (allghost) {
assert(jst->layout == NULL); // otherwise should have been caught above
jst->struct_decl = T_void;
}
else if (!isTuple) {
if (jl_is_vecelement_type(jt))
// VecElement type is unwrapped in LLVM
jst->struct_decl = latypes[0];
else
structdecl->setBody(latypes);
}
else {
if (isarray && lasttype != T_int1 && !type_is_ghost(lasttype)) {
if (isvector && jl_special_vector_alignment(ntypes, jlasttype) != 0)
jst->struct_decl = VectorType::get(lasttype, ntypes);
else
jst->struct_decl = ArrayType::get(lasttype, ntypes);
}
else {
jst->struct_decl = StructType::get(jl_LLVMContext, ArrayRef<Type*>(&latypes[0], ntypes));
}
}
#ifndef JL_NDEBUG
// If LLVM and Julia disagree about alignment, much trouble ensues, so check it!
if (jst->layout) {
const DataLayout &DL =
#if JL_LLVM_VERSION >= 40000
jl_data_layout;
#else
jl_ExecutionEngine->getDataLayout();
#endif
unsigned llvm_alignment = DL.getABITypeAlignment((Type*)jst->struct_decl);
unsigned julia_alignment = jl_datatype_align(jst);
// Check that the alignment adheres to the heap alignment.
assert(julia_alignment <= JL_HEAP_ALIGNMENT);
// TODO: Fix alignment calculation in LLVM, as well as in the GC and the struct declaration
if (llvm_alignment <= JL_HEAP_ALIGNMENT)
assert(julia_alignment == llvm_alignment);
}
#endif
}
return (Type*)jst->struct_decl;
}
if (isboxed) *isboxed = true;
return T_pjlvalue;
}
static bool is_datatype_all_pointers(jl_datatype_t *dt)
{
size_t i, l = jl_datatype_nfields(dt);
for(i=0; i < l; i++) {
if (!jl_field_isptr(dt, i)) {
return false;
}
}
return true;
}
static bool is_tupletype_homogeneous(jl_svec_t *t, bool allow_va = false)
{
size_t i, l = jl_svec_len(t);
if (l > 0) {
jl_value_t *t0 = jl_svecref(t, 0);
if (!jl_is_leaf_type(t0)) {
if (allow_va && jl_is_vararg_type(t0) &&
jl_is_leaf_type(jl_unwrap_vararg(t0)))
return true;
return false;
}
for(i=1; i < l; i++) {
if (allow_va && i == l - 1 && jl_is_vararg_type(jl_svecref(t,i))) {
if (t0 != jl_unwrap_vararg(jl_svecref(t,i)))
return false;
continue;
}
if (t0 != jl_svecref(t,i))
return false;
}
}
return true;
}
static bool deserves_sret(jl_value_t *dt, Type *T)
{
assert(jl_is_datatype(dt));
return (size_t)jl_datatype_size(dt) > sizeof(void*) && !T->isFloatingPointTy() && !T->isVectorTy();
}
static bool for_each_uniontype_small(
std::function<void(unsigned, jl_datatype_t*)> f,
jl_value_t *ty,
unsigned &counter)
{
if (counter > 127)
return false;
if (jl_is_uniontype(ty)) {
bool allunbox = for_each_uniontype_small(f, ((jl_uniontype_t*)ty)->a, counter);
allunbox &= for_each_uniontype_small(f, ((jl_uniontype_t*)ty)->b, counter);
return allunbox;
}
else if (isbits_spec(ty)) {
f(++counter, (jl_datatype_t*)ty);
return true;
}
return false;
}
static Value *emit_typeof_boxed(jl_codectx_t &ctx, const jl_cgval_t &p);
static unsigned get_box_tindex(jl_datatype_t *jt, jl_value_t *ut)
{
unsigned new_idx = 0;
unsigned new_counter = 0;
for_each_uniontype_small(
// find the corresponding index in the new union-type
[&](unsigned new_idx_, jl_datatype_t *new_jt) {
if (jt == new_jt)
new_idx = new_idx_;
},
ut,
new_counter);
return new_idx;
}
// --- generating various field accessors ---
static Value *emit_nthptr_addr(jl_codectx_t &ctx, Value *v, ssize_t n, bool gctracked = true)
{
return ctx.builder.CreateGEP(emit_bitcast(ctx, gctracked ? decay_derived(v) : v, T_pprjlvalue),
ConstantInt::get(T_size, n));
}
static Value *emit_nthptr_addr(jl_codectx_t &ctx, Value *v, Value *idx, bool gctracked = true)
{
return ctx.builder.CreateGEP(emit_bitcast(ctx, gctracked ? decay_derived(v) : v, T_pprjlvalue), idx);
}
static Value *emit_nthptr(jl_codectx_t &ctx, Value *v, ssize_t n, MDNode *tbaa)
{
// p = (jl_value_t**)v; p[n]
Value *vptr = emit_nthptr_addr(ctx, v, n);
return tbaa_decorate(tbaa, ctx.builder.CreateLoad(T_prjlvalue, vptr));
}
static Value *emit_nthptr_recast(jl_codectx_t &ctx, Value *v, Value *idx, MDNode *tbaa, Type *ptype, bool gctracked = true)
{
// p = (jl_value_t**)v; *(ptype)&p[n]
Value *vptr = emit_nthptr_addr(ctx, v, idx, gctracked);
return tbaa_decorate(tbaa, ctx.builder.CreateLoad(emit_bitcast(ctx, vptr, ptype)));
}
static Value *emit_nthptr_recast(jl_codectx_t &ctx, Value *v, ssize_t n, MDNode *tbaa, Type *ptype, bool gctracked = true)
{
// p = (jl_value_t**)v; *(ptype)&p[n]
Value *vptr = emit_nthptr_addr(ctx, v, n, gctracked);
return tbaa_decorate(tbaa, ctx.builder.CreateLoad(emit_bitcast(ctx, vptr, ptype)));
}
static Value *emit_typeptr_addr(jl_codectx_t &ctx, Value *p)
{
ssize_t offset = (sizeof(jl_taggedvalue_t) -
offsetof(jl_taggedvalue_t, type)) / sizeof(jl_value_t*);
return emit_nthptr_addr(ctx, p, -offset);
}
static Value *boxed(jl_codectx_t &ctx, const jl_cgval_t &v, bool gcooted=true);
static Value *boxed(jl_codectx_t &ctx, const jl_cgval_t &v, jl_value_t* type) = delete; // C++11 (temporary to prevent rebase error)
static Value* mask_gc_bits(jl_codectx_t &ctx, Value *tag)
{
return ctx.builder.CreateIntToPtr(ctx.builder.CreateAnd(
ctx.builder.CreatePtrToInt(tag, T_size),
ConstantInt::get(T_size, ~(uintptr_t)15)),
tag->getType());
}
static Value *emit_typeof(jl_codectx_t &ctx, Value *tt)
{
assert(tt != NULL && !isa<AllocaInst>(tt) && "expected a conditionally boxed value");
// given p, a jl_value_t*, compute its type tag
// The raw address is not GC-safe to load from as it may have mask bits set.
// Note that this gives the optimizer license to not root this value. That
// is fine however, since leaf types are not GCed at the moment. Should
// that ever change, this may have to go through a special intrinsic.
Value *addr = emit_bitcast(ctx, emit_typeptr_addr(ctx, tt), T_ppjlvalue);
tt = tbaa_decorate(tbaa_tag, ctx.builder.CreateLoad(T_pjlvalue, addr));
return maybe_decay_untracked(mask_gc_bits(ctx, tt));
}
static jl_cgval_t emit_typeof(jl_codectx_t &ctx, const jl_cgval_t &p)
{
// given p, compute its type
if (p.constant)
return mark_julia_const(jl_typeof(p.constant));
if (p.isboxed && !jl_is_leaf_type(p.typ)) {
return mark_julia_type(ctx, emit_typeof(ctx, p.V), true, jl_datatype_type, /*needsroot*/false);
}
if (p.TIndex) {
Value *tindex = ctx.builder.CreateAnd(p.TIndex, ConstantInt::get(T_int8, 0x7f));
Value *pdatatype;
unsigned counter;
counter = 0;
bool allunboxed = for_each_uniontype_small(
[&](unsigned idx, jl_datatype_t *jt) { },
p.typ,
counter);
if (allunboxed)
pdatatype = decay_derived(Constant::getNullValue(T_ppjlvalue));
else {
// See note above in emit_typeof(Value*), we can't tell the system
// about this until we've cleared the GC bits.
pdatatype = emit_bitcast(ctx, emit_typeptr_addr(ctx, ctx.builder.CreateLoad(p.gcroot)), T_ppjlvalue);
}
counter = 0;
for_each_uniontype_small(
[&](unsigned idx, jl_datatype_t *jt) {
Value *cmp = ctx.builder.CreateICmpEQ(tindex, ConstantInt::get(T_int8, idx));
pdatatype = ctx.builder.CreateSelect(cmp,
decay_derived(literal_pointer_val_slot(ctx, (jl_value_t*)jt)),
pdatatype);
},
p.typ,
counter);
Value *datatype = tbaa_decorate(allunboxed ? tbaa_const : tbaa_tag,
ctx.builder.CreateLoad(T_pjlvalue, pdatatype));
if (!allunboxed)
datatype = mask_gc_bits(ctx, datatype);
datatype = maybe_decay_untracked(datatype);
return mark_julia_type(ctx, datatype, true, jl_datatype_type, /*needsroot*/false);
}
jl_value_t *aty = p.typ;
if (jl_is_type_type(aty)) {
// convert Int::Type{Int} ==> typeof(Int) ==> DataType
// but convert 1::Type{1} ==> typeof(1) ==> Int
aty = (jl_value_t*)jl_typeof(jl_tparam0(aty));
}
return mark_julia_const(aty);
}
static Value *emit_typeof_boxed(jl_codectx_t &ctx, const jl_cgval_t &p)
{
return boxed(ctx, emit_typeof(ctx, p));
}
static Value *emit_datatype_types(jl_codectx_t &ctx, Value *dt)
{
Value *Ptr = emit_bitcast(ctx, decay_derived(dt), T_ppjlvalue);
Value *Idx = ConstantInt::get(T_size, offsetof(jl_datatype_t, types) / sizeof(void*));
return tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(T_pjlvalue, ctx.builder.CreateGEP(T_pjlvalue, Ptr, Idx)));
}
static Value *emit_datatype_nfields(jl_codectx_t &ctx, Value *dt)
{
Value *type_svec = emit_bitcast(ctx, emit_datatype_types(ctx, dt), T_psize);
return tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(T_size, type_svec));
}
static Value *emit_datatype_size(jl_codectx_t &ctx, Value *dt)
{
Value *Ptr = emit_bitcast(ctx, decay_derived(dt), T_pint32);
Value *Idx = ConstantInt::get(T_size, offsetof(jl_datatype_t, size) / sizeof(int));
return tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(T_int32, ctx.builder.CreateGEP(T_int32, Ptr, Idx)));
}
/* this is valid code, it's simply unused
static Value *emit_sizeof(jl_codectx_t &ctx, const jl_cgval_t &p)
{
if (p.TIndex) {
Value *tindex = ctx.builder.CreateAnd(p.TIndex, ConstantInt::get(T_int8, 0x7f));
Value *size = ConstantInt::get(T_int32, -1);
unsigned counter = 0;
bool allunboxed = for_each_uniontype_small(
[&](unsigned idx, jl_datatype_t *jt) {
Value *cmp = ctx.builder.CreateICmpEQ(tindex, ConstantInt::get(T_int8, idx));
size = ctx.builder.CreateSelect(cmp, ConstantInt::get(T_int32, jl_datatype_size(jt)), size);
},
p.typ,
counter);
if (!allunboxed && p.ispointer() && p.V && !isa<AllocaInst>(p.V)) {
BasicBlock *currBB = ctx.builder.GetInsertBlock();
BasicBlock *dynloadBB = BasicBlock::Create(jl_LLVMContext, "dyn_sizeof", ctx.f);
BasicBlock *postBB = BasicBlock::Create(jl_LLVMContext, "post_sizeof", ctx.f);
Value *isboxed = ctx.builder.CreateICmpNE(
ctx.builder.CreateAnd(p.TIndex, ConstantInt::get(T_int8, 0x80)),
ConstantInt::get(T_int8, 0));
ctx.builder.CreateCondBr(isboxed, dynloadBB, postBB);
ctx.builder.SetInsertPoint(dynloadBB);
Value *datatype = emit_typeof(p.V);
Value *dyn_size = emit_datatype_size(ctx, datatype);
ctx.builder.CreateBr(postBB);
ctx.builder.SetInsertPoint(postBB);
PHINode *sizeof_merge = ctx.builder.CreatePHI(T_int32, 2);
sizeof_merge->addIncoming(dyn_size, dynloadBB);
sizeof_merge->addIncoming(size, currBB);
size = sizeof_merge;
}
#ifndef NDEBUG
// try to catch codegen errors early, before it uses this to memcpy over the entire stack
CreateConditionalAbort(ctx.builder, ctx.builder.CreateICmpEQ(size, ConstantInt::get(T_int32, -1)));
#endif
return size;
}
else if (jl_is_leaf_type(p.typ)) {
return ConstantInt::get(T_int32, jl_datatype_size(p.typ));
}
else {
Value *datatype = emit_typeof_boxed(ctx, p);
Value *dyn_size = emit_datatype_size(ctx, datatype);
return dyn_size;
}
}
*/
static Value *emit_datatype_mutabl(jl_codectx_t &ctx, Value *dt)
{
Value *Ptr = emit_bitcast(ctx, decay_derived(dt), T_pint8);
Value *Idx = ConstantInt::get(T_size, offsetof(jl_datatype_t, mutabl));
Value *mutabl = tbaa_decorate(tbaa_const,
ctx.builder.CreateLoad(T_int8, ctx.builder.CreateGEP(T_int8, Ptr, Idx)));
return ctx.builder.CreateTrunc(mutabl, T_int1);
}
static Value *emit_datatype_abstract(jl_codectx_t &ctx, Value *dt)
{
Value *Ptr = emit_bitcast(ctx, decay_derived(dt), T_pint8);
Value *Idx = ConstantInt::get(T_size, offsetof(jl_datatype_t, abstract));
Value *abstract = tbaa_decorate(tbaa_const,
ctx.builder.CreateLoad(T_int8, ctx.builder.CreateGEP(T_int8, Ptr, Idx)));
return ctx.builder.CreateTrunc(abstract, T_int1);
}
static Value *emit_datatype_isbitstype(jl_codectx_t &ctx, Value *dt)
{
Value *immut = ctx.builder.CreateXor(emit_datatype_mutabl(ctx, dt), ConstantInt::get(T_int1, -1));
Value *nofields = ctx.builder.CreateICmpEQ(emit_datatype_nfields(ctx, dt), ConstantInt::get(T_size, 0));
Value *isbitstype = ctx.builder.CreateAnd(immut, ctx.builder.CreateAnd(nofields,
ctx.builder.CreateXor(ctx.builder.CreateAnd(emit_datatype_abstract(ctx, dt),
ctx.builder.CreateICmpSGT(emit_datatype_size(ctx, dt), ConstantInt::get(T_int32, 0))),
ConstantInt::get(T_int1, -1))));
return isbitstype;
}
static Value *emit_datatype_name(jl_codectx_t &ctx, Value *dt)
{
return emit_nthptr(
ctx, dt,
(ssize_t)(offsetof(jl_datatype_t, name) / sizeof(char*)),
tbaa_const);
}
// --- generating various error checks ---
// Do not use conditional throw for cases that type inference can know
// the error is always thrown. This may cause non dominated use
// of SSA value error in the verifier.
static void just_emit_error(jl_codectx_t &ctx, const std::string &txt)
{
ctx.builder.CreateCall(prepare_call(jlerror_func), stringConstPtr(ctx.builder, txt));
}
static void emit_error(jl_codectx_t &ctx, const std::string &txt)
{
just_emit_error(ctx, txt);
ctx.builder.CreateUnreachable();
BasicBlock *cont = BasicBlock::Create(jl_LLVMContext,"after_error",ctx.f);
ctx.builder.SetInsertPoint(cont);
}
// DO NOT PASS IN A CONST CONDITION!
static void error_unless(jl_codectx_t &ctx, Value *cond, const std::string &msg)
{
BasicBlock *failBB = BasicBlock::Create(jl_LLVMContext,"fail",ctx.f);
BasicBlock *passBB = BasicBlock::Create(jl_LLVMContext,"pass");
ctx.builder.CreateCondBr(cond, passBB, failBB);
ctx.builder.SetInsertPoint(failBB);
just_emit_error(ctx, msg);
ctx.builder.CreateUnreachable();
ctx.f->getBasicBlockList().push_back(passBB);
ctx.builder.SetInsertPoint(passBB);
}
static void raise_exception(jl_codectx_t &ctx, Value *exc,
BasicBlock *contBB=nullptr)
{
if (JL_HOOK_TEST(ctx.params, raise_exception)) {
JL_HOOK_CALL(ctx.params, raise_exception, 2,
jl_box_voidpointer(wrap(ctx.builder.GetInsertBlock())),
jl_box_voidpointer(wrap(exc)));
} else {
JL_FEAT_REQUIRE(ctx, runtime);
ctx.builder.CreateCall(prepare_call(jlthrow_func), { mark_callee_rooted(exc) });
}
ctx.builder.CreateUnreachable();
if (!contBB) {
contBB = BasicBlock::Create(jl_LLVMContext, "after_throw", ctx.f);
}
else {
ctx.f->getBasicBlockList().push_back(contBB);
}
ctx.builder.SetInsertPoint(contBB);
}
// DO NOT PASS IN A CONST CONDITION!
static void raise_exception_unless(jl_codectx_t &ctx, Value *cond, Value *exc)
{
BasicBlock *failBB = BasicBlock::Create(jl_LLVMContext,"fail",ctx.f);
BasicBlock *passBB = BasicBlock::Create(jl_LLVMContext,"pass");
ctx.builder.CreateCondBr(cond, passBB, failBB);
ctx.builder.SetInsertPoint(failBB);
raise_exception(ctx, exc, passBB);
}
static size_t dereferenceable_size(jl_value_t *jt) {
size_t size = 0;
if (jl_is_array_type(jt)) {
// Array has at least this much data
size = sizeof(jl_array_t);
} else {
size = jl_datatype_size(jt);
}
return size;
}
static inline void maybe_mark_argument_dereferenceable(Argument *A, jl_value_t *jt) {
if (!jl_is_leaf_type(jt)) {
return;
}
size_t size = dereferenceable_size(jt);
if (!size) {
return;
}
A->getParent()->addDereferenceableAttr(A->getArgNo() + 1, size);
}
static inline Instruction *maybe_mark_load_dereferenceable(Instruction *LI, bool can_be_null, size_t size) {
if (!size) {
return LI;
}
llvm::SmallVector<Metadata *, 1> OPs;
OPs.push_back(ConstantAsMetadata::get(ConstantInt::get(T_int64, size)));
LI->setMetadata(can_be_null ? "dereferenceable_or_null" :
"dereferenceable",
MDNode::get(jl_LLVMContext, OPs));
return LI;
}
static inline Instruction *maybe_mark_load_dereferenceable(Instruction *LI, bool can_be_null, jl_value_t *jt) {
if (!jl_is_leaf_type(jt)) {
return LI;
}
size_t size = dereferenceable_size(jt);
return maybe_mark_load_dereferenceable(LI, can_be_null, size);
}
static void null_pointer_check(jl_codectx_t &ctx, Value *v)
{
raise_exception_unless(ctx,
ctx.builder.CreateICmpNE(v, Constant::getNullValue(v->getType())),
literal_pointer_val(ctx, jl_undefref_exception));
}
static void emit_type_error(jl_codectx_t &ctx, const jl_cgval_t &x, Value *type, const std::string &msg)
{
Value *fname_val = stringConstPtr(ctx.builder, ctx.funcName);
Value *msg_val = stringConstPtr(ctx.builder, msg);
ctx.builder.CreateCall(prepare_call(jltypeerror_func),
{ fname_val, msg_val,
maybe_decay_untracked(type), mark_callee_rooted(boxed(ctx, x, false))});
}
static std::pair<Value*, bool> emit_isa(jl_codectx_t &ctx, const jl_cgval_t &x, jl_value_t *type, const std::string *msg)
{
Optional<bool> known_isa;
if (x.constant)
known_isa = jl_isa(x.constant, type);
else if (jl_subtype(x.typ, type))
known_isa = true;
else if (jl_type_intersection(x.typ, type) == (jl_value_t*)jl_bottom_type)
known_isa = false;