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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
// Mark our stats as being from cgutils
#undef DEBUG_TYPE
#define DEBUG_TYPE "julia_irgen_cgutils"
STATISTIC(EmittedPointerFromObjref, "Number of emitted pointer_from_objref calls");
STATISTIC(EmittedPointerBitcast, "Number of emitted pointer bitcasts");
STATISTIC(EmittedTypeof, "Number of emitted typeof instructions");
STATISTIC(EmittedErrors, "Number of emitted errors");
STATISTIC(EmittedConditionalErrors, "Number of emitted conditional errors");
STATISTIC(EmittedExceptions, "Number of emitted exceptions");
STATISTIC(EmittedConditionalExceptions, "Number of emitted conditional exceptions");
STATISTIC(EmittedNullchecks, "Number of emitted nullchecks");
STATISTIC(EmittedGuards, "Number of emitted guards");
STATISTIC(EmittedIsaUnions, "Number of emitted isa-union checks");
STATISTIC(EmittedIsa, "Number of emitted isa checks");
STATISTIC(EmittedTypechecks, "Number of emitted typechecks");
STATISTIC(EmittedConcretechecks, "Number of emitted concrete checks");
STATISTIC(EmittedBoundschecks, "Number of emitted boundschecks");
STATISTIC(EmittedLockstates, "Number of emitted lockstate value calls");
STATISTIC(EmittedMemcpys, "Number of emitted memcpy instructions");
STATISTIC(SkippedMemcpys, "Number of skipped memcpy instructions");
STATISTIC(EmittedGetfieldUnknowns, "Number of unknown getfield calls emitted");
STATISTIC(EmittedGetfieldKnowns, "Number of known getfield calls emitted");
STATISTIC(EmittedSetfield, "Number of setfield calls emitted");
STATISTIC(EmittedUnionLoads, "Number of union loads emitted");
STATISTIC(EmittedVarargsLength, "Number of varargs length calls emitted");
STATISTIC(EmittedArraysize, "Number of arraysize calls emitted");
STATISTIC(EmittedArraylen, "Number of array length calls emitted");
STATISTIC(EmittedArrayptr, "Number of array data pointer loads emitted");
STATISTIC(EmittedArrayflags, "Number of arrayflags calls emitted");
STATISTIC(EmittedArrayNDims, "Number of array ndims calls emitted");
STATISTIC(EmittedArrayElsize, "Number of array elsize calls emitted");
STATISTIC(EmittedArrayOffset, "Number of array offset calls emitted");
STATISTIC(EmittedArrayNdIndex, "Number of array nd index calls emitted");
STATISTIC(EmittedBoxes, "Number of box operations emitted");
STATISTIC(EmittedCPointerChecks, "Number of C pointer checks emitted");
STATISTIC(EmittedAllocObjs, "Number of object allocations emitted");
STATISTIC(EmittedWriteBarriers, "Number of write barriers emitted");
STATISTIC(EmittedNewStructs, "Number of new structs emitted");
STATISTIC(EmittedDeferSignal, "Number of deferred signals emitted");
static Value *track_pjlvalue(jl_codectx_t &ctx, Value *V)
{
assert(V->getType() == ctx.types().T_pjlvalue);
return ctx.builder.CreateAddrSpaceCast(V, ctx.types().T_prjlvalue);
}
// Take an arbitrary untracked value and make it gc-tracked
static Value *maybe_decay_untracked(jl_codectx_t &ctx, Value *V)
{
if (V->getType() == ctx.types().T_pjlvalue)
return ctx.builder.CreateAddrSpaceCast(V, ctx.types().T_prjlvalue);
assert(V->getType() == ctx.types().T_prjlvalue);
return V;
}
// Take any value and mark that it may be derived from a rooted value
static Value *decay_derived(jl_codectx_t &ctx, 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::getWithSamePointeeType(cast<PointerType>(T), AddressSpace::Derived);
return ctx.builder.CreateAddrSpaceCast(V, NewT);
}
// Take any value and make it safe to pass to GEP
static Value *maybe_decay_tracked(jl_codectx_t &ctx, Value *V)
{
Type *T = V->getType();
if (cast<PointerType>(T)->getAddressSpace() != AddressSpace::Tracked)
return V;
Type *NewT = PointerType::getWithSamePointeeType(cast<PointerType>(T), AddressSpace::Derived);
return ctx.builder.CreateAddrSpaceCast(V, NewT);
}
static Value *mark_callee_rooted(jl_codectx_t &ctx, Value *V)
{
assert(V->getType() == ctx.types().T_pjlvalue || V->getType() == ctx.types().T_prjlvalue);
return ctx.builder.CreateAddrSpaceCast(V,
PointerType::get(ctx.types().T_jlvalue, AddressSpace::CalleeRooted));
}
AtomicOrdering get_llvm_atomic_order(enum jl_memory_order order)
{
switch (order) {
case jl_memory_order_notatomic: return AtomicOrdering::NotAtomic;
case jl_memory_order_unordered: return AtomicOrdering::Unordered;
case jl_memory_order_monotonic: return AtomicOrdering::Monotonic;
case jl_memory_order_acquire: return AtomicOrdering::Acquire;
case jl_memory_order_release: return AtomicOrdering::Release;
case jl_memory_order_acq_rel: return AtomicOrdering::AcquireRelease;
case jl_memory_order_seq_cst: return AtomicOrdering::SequentiallyConsistent;
default:
assert("invalid atomic ordering");
abort();
}
}
// --- language feature checks ---
#define JL_FEAT_TEST(ctx, feature) ((ctx).params->feature)
// --- string constants ---
static Value *stringConstPtr(
jl_codegen_params_t &emission_context,
IRBuilder<> &irbuilder,
const std::string &txt)
{
Module *M = jl_builderModule(irbuilder);
StringRef ctxt(txt.c_str(), txt.size() + 1);
Constant *Data = ConstantDataArray::get(irbuilder.getContext(), arrayRefFromStringRef(ctxt));
GlobalVariable *gv = get_pointer_to_constant(emission_context, Data, "_j_str", *M);
Value *zero = ConstantInt::get(Type::getInt32Ty(irbuilder.getContext()), 0);
Value *Args[] = { zero, zero };
return irbuilder.CreateInBoundsGEP(gv->getValueType(),
// Addrspacecast in case globals are in non-0 AS
irbuilder.CreateAddrSpaceCast(gv, gv->getValueType()->getPointerTo(0)),
Args);
}
// --- MDNode ---
Metadata *to_md_tree(jl_value_t *val, LLVMContext &ctxt) {
if (val == jl_nothing)
return nullptr;
Metadata *MD = nullptr;
if (jl_is_symbol(val)) {
MD = MDString::get(ctxt, jl_symbol_name((jl_sym_t*)val));
} else if (jl_is_bool(val)) {
MD = ConstantAsMetadata::get(ConstantInt::get(getInt1Ty(ctxt), jl_unbox_bool(val)));
} else if (jl_is_long(val)) {
MD = ConstantAsMetadata::get(ConstantInt::get(getInt64Ty(ctxt), jl_unbox_long(val)));
} else if (jl_is_tuple(val)) {
SmallVector<Metadata *, 8> MDs;
for (int f = 0, nf = jl_nfields(val); f < nf; ++f) {
MD = to_md_tree(jl_fieldref(val, f), ctxt);
if (MD)
MDs.push_back(MD);
}
MD = MDNode::get(ctxt, MDs);
} else {
jl_error("LLVM metadata needs to Symbol/Bool/Int or Tuple thereof");
}
return MD;
}
// --- Debug info ---
static DICompileUnit *getOrCreateJuliaCU(Module &M,
DICompileUnit::DebugEmissionKind emissionKind,
DICompileUnit::DebugNameTableKind tableKind)
{
// TODO: share debug objects globally in the context, instead of allocating a new one every time
// or figure out how to delete them afterwards?
// But at least share them a little bit here
auto CUs = M.debug_compile_units();
for (DICompileUnit *CU : CUs) {
if (CU->getEmissionKind() == emissionKind &&
CU->getNameTableKind() == tableKind)
return CU;
}
DIFile *topfile = DIFile::get(M.getContext(), "julia", ".");
DIBuilder dbuilder(M);
DICompileUnit *CU =
dbuilder.createCompileUnit(llvm::dwarf::DW_LANG_Julia
,topfile // File
,"julia" // Producer
,true // isOptimized
,"" // Flags
,0 // RuntimeVersion
,"" // SplitName
,emissionKind // Kind
,0 // DWOId
,true // SplitDebugInlining
,false // DebugInfoForProfiling
,tableKind // NameTableKind
);
dbuilder.finalize();
return CU;
}
static DIType *_julia_type_to_di(jl_codegen_params_t *ctx, jl_debugcache_t &debuginfo, jl_value_t *jt, DIBuilder *dbuilder, bool isboxed)
{
jl_datatype_t *jdt = (jl_datatype_t*)jt;
if (isboxed || !jl_is_datatype(jt) || !jdt->isconcretetype)
return debuginfo.jl_pvalue_dillvmt;
assert(jdt->layout);
DIType* _ditype = NULL;
DIType* &ditype = (ctx ? ctx->ditypes[jdt] : _ditype);
if (ditype)
return ditype;
const char *tname = jl_symbol_name(jdt->name->name);
if (jl_is_primitivetype(jt)) {
uint64_t SizeInBits = jl_datatype_nbits(jdt);
ditype = dbuilder->createBasicType(tname, SizeInBits, llvm::dwarf::DW_ATE_unsigned);
}
else if (jl_is_structtype(jt) && !jl_is_layout_opaque(jdt->layout)) {
size_t ntypes = jl_datatype_nfields(jdt);
std::vector<llvm::Metadata*> Elements(ntypes);
for (unsigned i = 0; i < ntypes; i++) {
jl_value_t *el = jl_field_type_concrete(jdt, i);
DIType *di;
if (jl_field_isptr(jdt, i))
di = debuginfo.jl_pvalue_dillvmt;
// TODO: elseif jl_islayout_inline
else
di = _julia_type_to_di(ctx, debuginfo, el, dbuilder, false);
Elements[i] = di;
}
DINodeArray ElemArray = dbuilder->getOrCreateArray(Elements);
std::string unique_name;
raw_string_ostream(unique_name) << (uintptr_t)jdt;
ditype = dbuilder->createStructType(
NULL, // Scope
tname, // Name
NULL, // File
0, // LineNumber
jl_datatype_nbits(jdt), // SizeInBits
8 * jl_datatype_align(jdt), // AlignInBits
DINode::FlagZero, // Flags
NULL, // DerivedFrom
ElemArray, // Elements
dwarf::DW_LANG_Julia, // RuntimeLanguage
nullptr, // VTableHolder
unique_name // UniqueIdentifier
);
}
else {
// return a typealias for types with hidden content
ditype = dbuilder->createTypedef(debuginfo.jl_pvalue_dillvmt, tname, NULL, 0, NULL);
}
return ditype;
}
static DIType *julia_type_to_di(jl_codectx_t &ctx, jl_debugcache_t &debuginfo, jl_value_t *jt, DIBuilder *dbuilder, bool isboxed)
{
return _julia_type_to_di(&ctx.emission_context, debuginfo, jt, dbuilder, isboxed);
}
void jl_debugcache_t::initialize(Module *m) {
if (initialized) {
return;
}
initialized = true;
// add needed base debugging definitions to our LLVM environment
DIBuilder dbuilder(*m);
DIFile *julia_h = dbuilder.createFile("julia.h", "");
DICompositeType *jl_value_dillvmt = dbuilder.createStructType(nullptr,
"jl_value_t",
julia_h,
71, // At the time of this writing. Not sure if it's worth it to keep this in sync
0 * 8, // sizeof(jl_value_t) * 8,
__alignof__(void*) * 8, // __alignof__(jl_value_t) * 8,
DINode::FlagZero, // Flags
nullptr, // Derived from
nullptr); // Elements - will be corrected later
jl_pvalue_dillvmt = dbuilder.createPointerType(jl_value_dillvmt, sizeof(jl_value_t*) * 8,
__alignof__(jl_value_t*) * 8);
SmallVector<llvm::Metadata *, 1> Elts;
std::vector<Metadata*> diargs(0);
Elts.push_back(jl_pvalue_dillvmt);
dbuilder.replaceArrays(jl_value_dillvmt,
dbuilder.getOrCreateArray(Elts));
jl_ppvalue_dillvmt = dbuilder.createPointerType(jl_pvalue_dillvmt, sizeof(jl_value_t**) * 8,
__alignof__(jl_value_t**) * 8);
diargs.push_back(jl_pvalue_dillvmt); // Return Type (ret value)
diargs.push_back(jl_pvalue_dillvmt); // First Argument (function)
diargs.push_back(jl_ppvalue_dillvmt); // Second Argument (argv)
// Third argument (length(argv))
diargs.push_back(_julia_type_to_di(NULL, *this, (jl_value_t*)jl_int32_type, &dbuilder, false));
jl_di_func_sig = dbuilder.createSubroutineType(
dbuilder.getOrCreateTypeArray(diargs));
jl_di_func_null_sig = dbuilder.createSubroutineType(
dbuilder.getOrCreateTypeArray(None));
}
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 V;
V = decay_derived(ctx, V);
Type *T = PointerType::get(ctx.types().T_jlvalue, AddressSpace::Derived);
if (V->getType() != T)
V = ctx.builder.CreateBitCast(V, T);
Function *F = prepare_call(pointer_from_objref_func);
CallInst *Call = ctx.builder.CreateCall(F, V);
Call->setAttributes(F->getAttributes());
++EmittedPointerFromObjref;
return Call;
}
static Value *get_gc_root_for(const jl_cgval_t &x)
{
if (x.Vboxed)
return x.Vboxed;
if (x.ispointer() && !x.constant) {
assert(x.V);
if (PointerType *T = dyn_cast<PointerType>(x.V->getType())) {
if (T->getAddressSpace() == AddressSpace::Tracked ||
T->getAddressSpace() == AddressSpace::Derived) {
return x.V;
}
}
}
return nullptr;
}
// --- emitting pointers directly into code ---
static inline Constant *literal_static_pointer_val(const void *p, Type *T);
static Value *julia_pgv(jl_codectx_t &ctx, const char *cname, void *addr)
{
// emit a GlobalVariable for a jl_value_t named "cname"
// store the name given so we can reuse it (facilitating merging later)
// so first see if there already is a GlobalVariable for this address
GlobalVariable* &gv = ctx.global_targets[addr];
Module *M = jl_Module;
StringRef localname;
std::string gvname;
if (!gv) {
raw_string_ostream(gvname) << cname << ctx.global_targets.size();
localname = StringRef(gvname);
}
else {
localname = gv->getName();
if (gv->getParent() != M)
gv = cast_or_null<GlobalVariable>(M->getNamedValue(localname));
}
if (gv == nullptr)
gv = new GlobalVariable(*M, ctx.types().T_pjlvalue,
false, GlobalVariable::ExternalLinkage,
NULL, localname);
// LLVM passes sometimes strip metadata when moving load around
// since the load at the new location satisfy the same condition as the original one.
// Mark the global as constant to LLVM code using our own metadata
// which is much less likely to be striped.
gv->setMetadata("julia.constgv", MDNode::get(gv->getContext(), None));
assert(localname == gv->getName());
assert(!gv->hasInitializer());
return gv;
}
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#
// reverse-of-reverse algorithm
std::string finalname;
StringRef name_str(jl_symbol_name(name));
finalname.resize(name_str.size() + 1);
finalname[0] = '#';
std::reverse_copy(name_str.begin(), name_str.end(), finalname.begin() + 1);
jl_module_t *parent = mod, *prev = NULL;
while (parent && parent != prev) {
size_t orig_end = finalname.size() + 1;
StringRef parent_name(jl_symbol_name(parent->name));
finalname.resize(orig_end + parent_name.size());
finalname[orig_end - 1] = '.';
std::reverse_copy(parent_name.begin(), parent_name.end(), finalname.begin() + orig_end);
prev = parent;
parent = parent->parent;
}
size_t orig_end = finalname.size();
StringRef prefix_name(prefix);
finalname.resize(orig_end + prefix_name.size());
std::reverse_copy(prefix_name.begin(), prefix_name.end(), finalname.begin() + orig_end);
std::reverse(finalname.begin(), finalname.end());
return julia_pgv(ctx, finalname.c_str(), addr);
}
static JuliaVariable *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 (!ctx.emission_context.imaging) {
// TODO: this is an optimization, but is it useful or premature
// (it'll block any attempt to cache these, but can be simply deleted)
Module *M = jl_Module;
GlobalVariable *gv = new GlobalVariable(
*M, ctx.types().T_pjlvalue, true, GlobalVariable::PrivateLinkage,
literal_static_pointer_val(p, ctx.types().T_pjlvalue));
gv->setUnnamedAddr(GlobalValue::UnnamedAddr::Global);
return gv;
}
if (JuliaVariable *gv = julia_const_gv(p)) {
// if this is a known special object, use the existing GlobalValue
return prepare_global_in(jl_Module, 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 size_t dereferenceable_size(jl_value_t *jt)
{
if (jl_is_array_type(jt)) {
// Array has at least this much data
return sizeof(jl_array_t);
}
else if (jl_is_datatype(jt) && jl_struct_try_layout((jl_datatype_t*)jt)) {
return jl_datatype_size(jt);
}
return 0;
}
// Return the min required / expected alignment of jltype (on the stack or heap)
static unsigned julia_alignment(jl_value_t *jt)
{
if (jl_is_array_type(jt)) {
// Array always has this alignment
return JL_SMALL_BYTE_ALIGNMENT;
}
if (jt == (jl_value_t*)jl_datatype_type) {
// types are never allocated in julia code/on the stack
// and this is the guarantee we have for the GC bits
return 16;
}
assert(jl_is_datatype(jt) && jl_struct_try_layout((jl_datatype_t*)jt));
unsigned alignment = jl_datatype_align(jt);
if (alignment > JL_HEAP_ALIGNMENT)
return JL_HEAP_ALIGNMENT;
return alignment;
}
static inline void maybe_mark_argument_dereferenceable(AttrBuilder &B, jl_value_t *jt)
{
B.addAttribute(Attribute::NonNull);
B.addAttribute(Attribute::NoUndef);
// The `dereferenceable` below does not imply `nonnull` for non addrspace(0) pointers.
size_t size = dereferenceable_size(jt);
if (size) {
B.addDereferenceableAttr(size);
B.addAlignmentAttr(julia_alignment(jt));
}
}
static inline Instruction *maybe_mark_load_dereferenceable(Instruction *LI, bool can_be_null,
size_t size, size_t align)
{
if (isa<PointerType>(LI->getType())) {
if (!can_be_null)
// The `dereferenceable` below does not imply `nonnull` for non addrspace(0) pointers.
LI->setMetadata(LLVMContext::MD_nonnull, MDNode::get(LI->getContext(), None));
if (size) {
Metadata *OP = ConstantAsMetadata::get(ConstantInt::get(getInt64Ty(LI->getContext()), size));
LI->setMetadata(can_be_null ? LLVMContext::MD_dereferenceable_or_null : LLVMContext::MD_dereferenceable,
MDNode::get(LI->getContext(), { OP }));
if (align >= 1) {
Metadata *OP = ConstantAsMetadata::get(ConstantInt::get(getInt64Ty(LI->getContext()), align));
LI->setMetadata(LLVMContext::MD_align, MDNode::get(LI->getContext(), { OP }));
}
}
}
return LI;
}
static inline Instruction *maybe_mark_load_dereferenceable(Instruction *LI, bool can_be_null, jl_value_t *jt)
{
size_t size = dereferenceable_size(jt);
unsigned alignment = 1;
if (size > 0)
alignment = julia_alignment(jt);
return maybe_mark_load_dereferenceable(LI, can_be_null, size, alignment);
}
// Returns ctx.types().T_pjlvalue
static Value *literal_pointer_val(jl_codectx_t &ctx, jl_value_t *p)
{
if (p == NULL)
return Constant::getNullValue(ctx.types().T_pjlvalue);
if (!ctx.emission_context.imaging)
return literal_static_pointer_val(p, ctx.types().T_pjlvalue);
Value *pgv = literal_pointer_val_slot(ctx, p);
jl_aliasinfo_t ai = jl_aliasinfo_t::fromTBAA(ctx, ctx.tbaa().tbaa_const);
return ai.decorateInst(maybe_mark_load_dereferenceable(
ctx.builder.CreateAlignedLoad(ctx.types().T_pjlvalue, pgv, Align(sizeof(void*))),
false, jl_typeof(p)));
}
// Returns ctx.types().T_pjlvalue
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 Constant::getNullValue(ctx.types().T_pjlvalue);
if (!ctx.emission_context.imaging)
return literal_static_pointer_val(p, ctx.types().T_pjlvalue);
// bindings are prefixed with jl_bnd#
jl_globalref_t *gr = p->globalref;
Value *pgv = gr ? julia_pgv(ctx, "jl_bnd#", gr->name, gr->mod, p) : julia_pgv(ctx, "jl_bnd#", p);
jl_aliasinfo_t ai = jl_aliasinfo_t::fromTBAA(ctx, ctx.tbaa().tbaa_const);
return ai.decorateInst(maybe_mark_load_dereferenceable(
ctx.builder.CreateAlignedLoad(ctx.types().T_pjlvalue, pgv, Align(sizeof(void*))),
false, sizeof(jl_binding_t), alignof(jl_binding_t)));
}
// 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::getWithSamePointeeType(cast<PointerType>(jl_value), v->getType()->getPointerAddressSpace());
++EmittedPointerBitcast;
return ctx.builder.CreateBitCast(v, jl_value_addr);
}
else {
return ctx.builder.CreateBitCast(v, jl_value);
}
}
static Value *maybe_bitcast(jl_codectx_t &ctx, Value *V, Type *to) {
if (to != V->getType())
return emit_bitcast(ctx, V, to);
return V;
}
static Value *julia_binding_pvalue(jl_codectx_t &ctx, Value *bv)
{
bv = emit_bitcast(ctx, bv, ctx.types().T_pprjlvalue);
Value *offset = ConstantInt::get(ctx.types().T_size, offsetof(jl_binding_t, value) / ctx.types().sizeof_ptr);
return ctx.builder.CreateInBoundsGEP(ctx.types().T_prjlvalue, bv, offset);
}
static Value *julia_binding_gv(jl_codectx_t &ctx, jl_binding_t *b)
{
// emit a literal_pointer_val to a jl_binding_t
// binding->value are prefixed with *
if (ctx.emission_context.imaging) {
jl_globalref_t *gr = b->globalref;
Value *pgv = gr ? julia_pgv(ctx, "*", gr->name, gr->mod, b) : julia_pgv(ctx, "*jl_bnd#", b);
jl_aliasinfo_t ai = jl_aliasinfo_t::fromTBAA(ctx, ctx.tbaa().tbaa_const);
return ai.decorateInst(ctx.builder.CreateAlignedLoad(ctx.types().T_pjlvalue, pgv, Align(sizeof(void*))));
}
else {
return literal_static_pointer_val(b, ctx.types().T_pjlvalue);
}
}
// --- mapping between julia and llvm types ---
static bool type_is_permalloc(jl_value_t *typ)
{
// Singleton should almost always be handled by the later optimization passes.
// Also do it here since it is cheap and save some effort in LLVM passes.
if (jl_is_datatype(typ) && jl_is_datatype_singleton((jl_datatype_t*)typ))
return true;
return typ == (jl_value_t*)jl_symbol_type ||
typ == (jl_value_t*)jl_int8_type ||
typ == (jl_value_t*)jl_uint8_type;
}
static unsigned convert_struct_offset(const llvm::DataLayout &DL, Type *lty, unsigned byte_offset)
{
const StructLayout *SL = DL.getStructLayout(cast<StructType>(lty));
unsigned idx = SL->getElementContainingOffset(byte_offset);
assert(SL->getElementOffset(idx) == byte_offset);
return idx;
}
static unsigned convert_struct_offset(jl_codectx_t &ctx, Type *lty, unsigned byte_offset)
{
return convert_struct_offset(ctx.builder.GetInsertBlock()->getModule()->getDataLayout(), lty, byte_offset);
}
static Value *emit_struct_gep(jl_codectx_t &ctx, Type *lty, Value *base, unsigned byte_offset)
{
unsigned idx = convert_struct_offset(ctx, lty, byte_offset);
return ctx.builder.CreateConstInBoundsGEP2_32(lty, base, 0, idx);
}
static Type *_julia_struct_to_llvm(jl_codegen_params_t *ctx, LLVMContext &ctxt, jl_value_t *jt, bool *isboxed, bool llvmcall=false);
static Type *_julia_type_to_llvm(jl_codegen_params_t *ctx, LLVMContext &ctxt, 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 getVoidTy(ctxt);
if (jl_is_concrete_immutable(jt)) {
if (jl_datatype_nbits(jt) == 0)
return getVoidTy(ctxt);
Type *t = _julia_struct_to_llvm(ctx, ctxt, jt, isboxed);
assert(t != NULL);
return t;
}
if (isboxed) *isboxed = true;
return JuliaType::get_prjlvalue_ty(ctxt);
}
static Type *julia_type_to_llvm(jl_codectx_t &ctx, jl_value_t *jt, bool *isboxed)
{
return _julia_type_to_llvm(&ctx.emission_context, ctx.builder.getContext(), jt, isboxed);
}
extern "C" JL_DLLEXPORT
Type *jl_type_to_llvm_impl(jl_value_t *jt, LLVMContextRef ctxt, bool *isboxed)
{
return _julia_type_to_llvm(NULL, *unwrap(ctxt), jt, isboxed);
}
// converts a julia bitstype into the equivalent LLVM bitstype
static Type *bitstype_to_llvm(jl_value_t *bt, LLVMContext &ctxt, bool llvmcall = false)
{
assert(jl_is_primitivetype(bt));
if (bt == (jl_value_t*)jl_bool_type)
return llvmcall ? getInt1Ty(ctxt) : getInt8Ty(ctxt);
if (bt == (jl_value_t*)jl_int32_type)
return getInt32Ty(ctxt);
if (bt == (jl_value_t*)jl_int64_type)
return getInt64Ty(ctxt);
if (bt == (jl_value_t*)jl_float16_type)
return getHalfTy(ctxt);
if (bt == (jl_value_t*)jl_float32_type)
return getFloatTy(ctxt);
if (bt == (jl_value_t*)jl_float64_type)
return getDoubleTy(ctxt);
if (jl_is_llvmpointer_type(bt)) {
jl_value_t *as_param = jl_tparam1(bt);
int as;
if (jl_is_int32(as_param))
as = jl_unbox_int32(as_param);
else if (jl_is_int64(as_param))
as = jl_unbox_int64(as_param);
else
jl_error("invalid pointer address space");
return PointerType::get(getInt8Ty(ctxt), as);
}
int nb = jl_datatype_size(bt);
return Type::getIntNTy(ctxt, nb * 8);
}
static bool jl_type_hasptr(jl_value_t* typ)
{ // assumes that jl_stored_inline(typ) is true (and therefore that layout is defined)
return jl_is_datatype(typ) && ((jl_datatype_t*)typ)->layout->npointers > 0;
}
static unsigned jl_field_align(jl_datatype_t *dt, size_t i)
{
unsigned al = jl_field_offset(dt, i);
al |= 16;
al &= -al;
return std::min({al, (unsigned)jl_datatype_align(dt), (unsigned)JL_HEAP_ALIGNMENT});
}
static Type *_julia_struct_to_llvm(jl_codegen_params_t *ctx, LLVMContext &ctxt, jl_value_t *jt, bool *isboxed, bool llvmcall)
{
// 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 getVoidTy(ctxt);
if (jl_is_primitivetype(jt))
return bitstype_to_llvm(jt, ctxt, llvmcall);
jl_datatype_t *jst = (jl_datatype_t*)jt;
if (jl_is_structtype(jt) && !(jst->layout && jl_is_layout_opaque(jst->layout))) {
bool isTuple = jl_is_tuple_type(jt);
jl_svec_t *ftypes = jl_get_fieldtypes(jst);
size_t i, ntypes = jl_svec_len(ftypes);
if (!jl_struct_try_layout(jst)) {
assert(0 && "caller should have checked jl_type_mappable_to_c already");
abort();
}
if (ntypes == 0 || jl_datatype_nbits(jst) == 0)
return getVoidTy(ctxt);
Type *_struct_decl = NULL;
// TODO: we should probably make a temporary root for `jst` somewhere
// don't use pre-filled struct_decl for llvmcall (f16, etc. may be different)
Type *&struct_decl = (ctx && !llvmcall ? ctx->llvmtypes[jst] : _struct_decl);
if (struct_decl)
return struct_decl;
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(ftypes, i);
if (jlasttype != NULL && ty != jlasttype)
isvector = false;
jlasttype = ty;
if (jl_field_isatomic(jst, i)) {
// TODO: eventually support this?
// though it's a bit unclear how the implicit load should be interpreted
assert(0 && "caller should have checked jl_type_mappable_to_c already");
abort();
}
Type *lty;
if (jl_field_isptr(jst, i)) {
lty = JuliaType::get_prjlvalue_ty(ctxt);
isvector = false;
}
else if (ty == (jl_value_t*)jl_bool_type) {
lty = getInt8Ty(ctxt);
}
else if (jl_is_uniontype(ty)) {
// pick an Integer type size such that alignment will generally be correct,
// and always end with an Int8 (selector byte).
// We may need to insert padding first to get to the right offset
size_t fsz = 0, al = 0;
bool isptr = !jl_islayout_inline(ty, &fsz, &al);
assert(!isptr && fsz == jl_field_size(jst, i) - 1); (void)isptr;
if (fsz > 0) {
if (al > MAX_ALIGN) {
Type *AlignmentType;
AlignmentType = ArrayType::get(FixedVectorType::get(getInt8Ty(ctxt), al), 0);
latypes.push_back(AlignmentType);
al = MAX_ALIGN;
}
Type *AlignmentType = IntegerType::get(ctxt, 8 * al);
unsigned NumATy = fsz / al;
unsigned remainder = fsz % al;
assert(al == 1 || NumATy > 0);
while (NumATy--)
latypes.push_back(AlignmentType);
while (remainder--)
latypes.push_back(getInt8Ty(ctxt));
}
latypes.push_back(getInt8Ty(ctxt));
isarray = false;
allghost = false;
continue;
}
else {
bool isptr;
lty = _julia_struct_to_llvm(ctx, ctxt, ty, &isptr, llvmcall);
assert(lty && !isptr);
}
if (lasttype != NULL && lasttype != lty)
isarray = false;
lasttype = lty;
if (!type_is_ghost(lty)) {
allghost = false;
latypes.push_back(lty);
}
}
if (allghost) {
assert(jst->layout == NULL); // otherwise should have been caught above
struct_decl = getVoidTy(ctxt);
}
else if (jl_is_vecelement_type(jt) && !jl_is_uniontype(jl_svecref(ftypes, 0))) {
// VecElement type is unwrapped in LLVM (when possible)
struct_decl = latypes[0];
}
else if (isarray && !type_is_ghost(lasttype)) {
if (isTuple && isvector && jl_special_vector_alignment(ntypes, jlasttype) != 0)
struct_decl = FixedVectorType::get(lasttype, ntypes);
else if (isTuple || !llvmcall)
struct_decl = ArrayType::get(lasttype, ntypes);
else
struct_decl = StructType::get(ctxt, latypes);
}
else {
#if 0 // stress-test code that tries to assume julia-index == llvm-index
// (also requires change to emit_new_struct to not assume 0 == 0)
if (!isTuple && latypes.size() > 1) {
Type *NoopType = ArrayType::get(getInt1Ty(ctxt), 0);
latypes.insert(latypes.begin(), NoopType);
}
#endif
struct_decl = StructType::get(ctxt, latypes);
}
return struct_decl;
}
// TODO: enable this (with tests) to change ccall calling convention for Union:
// if (jl_is_uniontype(ty)) {
// // pick an Integer type size such that alignment will be correct
// // and always end with an Int8 (selector byte)
// lty = ArrayType::get(IntegerType::get(lty->getContext(), 8 * al), fsz / al);
// std::vector<Type*> Elements(2);
// Elements[0] = lty;
// Elements[1] = getInt8Ty(ctxt);
// unsigned remainder = fsz % al;
// while (remainder--)
// Elements.push_back(getInt8Ty(ctxt));
// lty = StructType::get(lty->getContext(), makeArrayRef(Elements));
// }
if (isboxed) *isboxed = true;
return JuliaType::get_prjlvalue_ty(ctxt);
}
static Type *julia_struct_to_llvm(jl_codectx_t &ctx, jl_value_t *jt, bool *isboxed)
{
return _julia_struct_to_llvm(&ctx.emission_context, ctx.builder.getContext(), jt, isboxed);
}
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_concrete_type(t0)) {
if (allow_va && jl_is_vararg(t0) &&
jl_is_concrete_type(jl_unwrap_vararg(t0)))
return true;
return false;
}
for (i = 1; i < l; i++) {
if (allow_va && i == l - 1 && jl_is_vararg(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 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 (jl_is_pointerfree(ty)) {
f(++counter, (jl_datatype_t*)ty);
return true;
}
return false;
}
static bool is_uniontype_allunboxed(jl_value_t *typ)
{
unsigned counter = 0;
return for_each_uniontype_small([&](unsigned, jl_datatype_t*) {}, typ, counter);
}
static Value *emit_typeof_boxed(jl_codectx_t &ctx, const jl_cgval_t &p, bool maybenull=false);
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 Constant *julia_const_to_llvm(jl_codectx_t &ctx, jl_value_t *e);
static Value *data_pointer(jl_codectx_t &ctx, const jl_cgval_t &x)
{
assert(x.ispointer());
Value *data;
if (x.constant) {
Constant *val = julia_const_to_llvm(ctx, x.constant);
if (val)
data = get_pointer_to_constant(ctx.emission_context, val, "_j_const", *jl_Module);
else
data = literal_pointer_val(ctx, x.constant);
}
else if (x.V == NULL) {
// might be a ghost union with tindex but no actual pointer
data = NULL;
}
else {
data = maybe_decay_tracked(ctx, x.V);
}
return data;
}
static void emit_memcpy_llvm(jl_codectx_t &ctx, Value *dst, jl_aliasinfo_t const &dst_ai, Value *src,
jl_aliasinfo_t const &src_ai, uint64_t sz, unsigned align, bool is_volatile)
{
if (sz == 0)
return;
assert(align && "align must be specified");
// If the types are small and simple, use load and store directly.
// Going through memcpy can cause LLVM (e.g. SROA) to create bitcasts between float and int
// that interferes with other optimizations.
// TODO: Restore this for opaque pointers? Needs extra type information from the caller.
if (ctx.builder.getContext().supportsTypedPointers() && sz <= 64) {
// The size limit is arbitrary but since we mainly care about floating points and
// machine size vectors this should be enough.
const DataLayout &DL = jl_Module->getDataLayout();
auto srcty = cast<PointerType>(src->getType());
//TODO unsafe nonopaque pointer
auto srcel = srcty->getNonOpaquePointerElementType();
auto dstty = cast<PointerType>(dst->getType());
//TODO unsafe nonopaque pointer
auto dstel = dstty->getNonOpaquePointerElementType();
while (srcel->isArrayTy() && srcel->getArrayNumElements() == 1) {
src = ctx.builder.CreateConstInBoundsGEP2_32(srcel, src, 0, 0);
srcel = srcel->getArrayElementType();
srcty = srcel->getPointerTo();
}
while (dstel->isArrayTy() && dstel->getArrayNumElements() == 1) {
dst = ctx.builder.CreateConstInBoundsGEP2_32(dstel, dst, 0, 0);
dstel = dstel->getArrayElementType();
dstty = dstel->getPointerTo();
}
llvm::Type *directel = nullptr;
if (srcel->isSized() && srcel->isSingleValueType() && DL.getTypeStoreSize(srcel) == sz) {
directel = srcel;
dst = emit_bitcast(ctx, dst, srcty);
}
else if (dstel->isSized() && dstel->isSingleValueType() &&
DL.getTypeStoreSize(dstel) == sz) {
directel = dstel;
src = emit_bitcast(ctx, src, dstty);
}
if (directel) {
auto val = src_ai.decorateInst(ctx.builder.CreateAlignedLoad(directel, src, Align(align), is_volatile));
dst_ai.decorateInst(ctx.builder.CreateAlignedStore(val, dst, Align(align), is_volatile));
++SkippedMemcpys;
return;
}
}
++EmittedMemcpys;
// the memcpy intrinsic does not allow to specify different alias tags
// for the load part (x.tbaa) and the store part (ctx.tbaa().tbaa_stack).
// since the tbaa lattice has to be a tree we have unfortunately
// x.tbaa ∪ ctx.tbaa().tbaa_stack = tbaa_root if x.tbaa != ctx.tbaa().tbaa_stack
// Now that we use scoped aliases to label disparate regions of memory, the TBAA
// metadata should be revisited so that it only represents memory layouts. Once
// that's done, we can expect that in most cases tbaa(src) == tbaa(dst) and the
// above problem won't be as serious.
auto merged_ai = dst_ai.merge(src_ai);
ctx.builder.CreateMemCpy(dst, MaybeAlign(align), src, MaybeAlign(0), sz, is_volatile,
merged_ai.tbaa, merged_ai.tbaa_struct, merged_ai.scope, merged_ai.noalias);
}
static void emit_memcpy_llvm(jl_codectx_t &ctx, Value *dst, jl_aliasinfo_t const &dst_ai, Value *src,
jl_aliasinfo_t const &src_ai, Value *sz, unsigned align, bool is_volatile)
{
if (auto const_sz = dyn_cast<ConstantInt>(sz)) {
emit_memcpy_llvm(ctx, dst, dst_ai, src, src_ai, const_sz->getZExtValue(), align, is_volatile);
return;
}