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ccall.cpp
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// This file is a part of Julia. License is MIT: https://julialang.org/license
// --- the ccall, cglobal, and llvm intrinsics ---
// Mark our stats as being from ccall
#undef DEBUG_TYPE
#define DEBUG_TYPE "julia_irgen_ccall"
STATISTIC(RuntimeSymLookups, "Number of runtime symbol lookups emitted");
STATISTIC(PLTThunks, "Number of PLT Thunks emitted");
STATISTIC(PLT, "Number of direct PLT entries emitted");
STATISTIC(EmittedCGlobals, "Number of C globals emitted");
STATISTIC(EmittedLLVMCalls, "Number of llvmcall intrinsics emitted");
#define _CCALL_STAT(name) jl_transformed_ccall__##name
#define CCALL_STAT(name) _CCALL_STAT(name)
#define TRANSFORMED_CCALL_STAT(name) STATISTIC(_CCALL_STAT(name), "Number of " #name " ccalls intercepted")
TRANSFORMED_CCALL_STAT(jl_array_ptr);
TRANSFORMED_CCALL_STAT(jl_value_ptr);
TRANSFORMED_CCALL_STAT(jl_cpu_pause);
TRANSFORMED_CCALL_STAT(jl_cpu_wake);
TRANSFORMED_CCALL_STAT(jl_gc_safepoint);
TRANSFORMED_CCALL_STAT(jl_get_ptls_states);
TRANSFORMED_CCALL_STAT(jl_threadid);
TRANSFORMED_CCALL_STAT(jl_get_ptls_rng);
TRANSFORMED_CCALL_STAT(jl_set_ptls_rng);
TRANSFORMED_CCALL_STAT(jl_get_tls_world_age);
TRANSFORMED_CCALL_STAT(jl_get_world_counter);
TRANSFORMED_CCALL_STAT(jl_gc_enable_disable_finalizers_internal);
TRANSFORMED_CCALL_STAT(jl_get_current_task);
TRANSFORMED_CCALL_STAT(jl_set_next_task);
TRANSFORMED_CCALL_STAT(jl_sigatomic_begin);
TRANSFORMED_CCALL_STAT(jl_sigatomic_end);
TRANSFORMED_CCALL_STAT(jl_string_ptr);
TRANSFORMED_CCALL_STAT(jl_symbol_name);
TRANSFORMED_CCALL_STAT(jl_genericmemory_owner);
TRANSFORMED_CCALL_STAT(jl_alloc_genericmemory);
TRANSFORMED_CCALL_STAT(memcpy);
TRANSFORMED_CCALL_STAT(memset);
TRANSFORMED_CCALL_STAT(memmove);
TRANSFORMED_CCALL_STAT(jl_object_id);
#undef TRANSFORMED_CCALL_STAT
extern "C" JL_DLLEXPORT jl_value_t *ijl_genericmemory_owner(jl_genericmemory_t *m JL_PROPAGATES_ROOT) JL_NOTSAFEPOINT;
STATISTIC(EmittedCCalls, "Number of ccalls emitted");
STATISTIC(DeferredCCallLookups, "Number of ccalls looked up at runtime");
STATISTIC(LiteralCCalls, "Number of ccalls directly emitted through a pointer");
STATISTIC(RetBoxedCCalls, "Number of ccalls that were retboxed");
STATISTIC(SRetCCalls, "Number of ccalls that were marked sret");
// somewhat unusual variable, in that aotcompile wants to get the address of this for a sanity check
GlobalVariable *jl_emit_RTLD_DEFAULT_var(Module *M)
{
return prepare_global_in(M, jlRTLD_DEFAULT_var);
}
// Find or create the GVs for the library and symbol lookup.
// Return `runtime_lib` (whether the library name is a string)
// The `lib` and `sym` GV returned may not be in the current module.
static bool runtime_sym_gvs(jl_codectx_t &ctx, const char *f_lib, const char *f_name,
GlobalVariable *&lib, GlobalVariable *&sym)
{
auto M = &ctx.emission_context.shared_module();
bool runtime_lib = false;
GlobalVariable *libptrgv;
jl_codegen_params_t::SymMapGV *symMap;
if ((intptr_t)f_lib == (intptr_t)JL_EXE_LIBNAME) {
libptrgv = prepare_global_in(M, jlexe_var);
symMap = &ctx.emission_context.symMapExe;
}
else if ((intptr_t)f_lib == (intptr_t)JL_LIBJULIA_INTERNAL_DL_LIBNAME) {
libptrgv = prepare_global_in(M, jldlli_var);
symMap = &ctx.emission_context.symMapDlli;
}
else if ((intptr_t)f_lib == (intptr_t)JL_LIBJULIA_DL_LIBNAME) {
libptrgv = prepare_global_in(M, jldll_var);
symMap = &ctx.emission_context.symMapDll;
}
else if (f_lib == NULL) {
libptrgv = jl_emit_RTLD_DEFAULT_var(M);
symMap = &ctx.emission_context.symMapDefault;
}
else {
std::string name = "ccalllib_";
name += llvm::sys::path::filename(f_lib);
name += std::to_string(jl_atomic_fetch_add_relaxed(&globalUniqueGeneratedNames, 1));
runtime_lib = true;
auto &libgv = ctx.emission_context.libMapGV[f_lib];
if (libgv.first == NULL) {
libptrgv = new GlobalVariable(*M, getPointerTy(M->getContext()), false,
GlobalVariable::ExternalLinkage,
Constant::getNullValue(getPointerTy(M->getContext())), name);
libgv.first = libptrgv;
}
else {
libptrgv = libgv.first;
}
symMap = &libgv.second;
}
GlobalVariable *&llvmgv = (*symMap)[f_name];
if (llvmgv == NULL) {
std::string name = "ccall_";
name += f_name;
name += "_";
name += std::to_string(jl_atomic_fetch_add_relaxed(&globalUniqueGeneratedNames, 1));
auto T_pvoidfunc = JuliaType::get_pvoidfunc_ty(M->getContext());
llvmgv = new GlobalVariable(*M, T_pvoidfunc, false,
GlobalVariable::ExternalLinkage,
Constant::getNullValue(T_pvoidfunc), name);
}
lib = libptrgv;
sym = llvmgv;
return runtime_lib;
}
static Value *runtime_sym_lookup(
jl_codegen_params_t &emission_context,
IRBuilder<> &irbuilder,
jl_codectx_t *ctx,
PointerType *funcptype, const char *f_lib, jl_value_t *lib_expr,
const char *f_name, Function *f,
GlobalVariable *libptrgv,
GlobalVariable *llvmgv, bool runtime_lib)
{
++RuntimeSymLookups;
// in pseudo-code, this function emits the following:
// global HMODULE *libptrgv
// global void **llvmgv
// if (*llvmgv == NULL) {
// *llvmgv = jl_load_and_lookup(f_lib, f_name, libptrgv);
// }
// return (*llvmgv)
auto T_pvoidfunc = JuliaType::get_pvoidfunc_ty(irbuilder.getContext());
BasicBlock *enter_bb = irbuilder.GetInsertBlock();
BasicBlock *dlsym_lookup = BasicBlock::Create(irbuilder.getContext(), "dlsym");
BasicBlock *ccall_bb = BasicBlock::Create(irbuilder.getContext(), "ccall");
Constant *initnul = ConstantPointerNull::get(T_pvoidfunc);
LoadInst *llvmf_orig = irbuilder.CreateAlignedLoad(T_pvoidfunc, llvmgv, Align(sizeof(void*)));
setName(emission_context, llvmf_orig, f_name + StringRef(".cached"));
// This in principle needs a consume ordering so that load from
// this pointer sees a valid value. However, this is not supported by
// LLVM (or agreed on in the C/C++ standard FWIW) and should be
// almost impossible to happen on every platform we support since this
// ordering is enforced by the hardware and LLVM has to speculate an
// invalid load from the `cglobal` but doesn't depend on the `cglobal`
// value for this to happen.
llvmf_orig->setAtomic(AtomicOrdering::Unordered);
auto nonnull = irbuilder.CreateICmpNE(llvmf_orig, initnul);
setName(emission_context, nonnull, "is_cached");
irbuilder.CreateCondBr(
nonnull,
ccall_bb,
dlsym_lookup);
assert(f->getParent() != NULL);
dlsym_lookup->insertInto(f);
irbuilder.SetInsertPoint(dlsym_lookup);
Instruction *llvmf;
Value *nameval = stringConstPtr(emission_context, irbuilder, f_name);
if (lib_expr) {
jl_cgval_t libval = emit_expr(*ctx, lib_expr);
llvmf = irbuilder.CreateCall(prepare_call_in(jl_builderModule(irbuilder), jllazydlsym_func),
{ boxed(*ctx, libval), nameval });
}
else {
Value *libname;
if (runtime_lib) {
libname = stringConstPtr(emission_context, irbuilder, f_lib);
}
else {
// f_lib is actually one of the special sentinel values
libname = ConstantExpr::getIntToPtr(ConstantInt::get(emission_context.DL.getIntPtrType(irbuilder.getContext()), (uintptr_t)f_lib), getPointerTy(irbuilder.getContext()));
}
auto lookup = irbuilder.CreateCall(prepare_call_in(jl_builderModule(irbuilder), jldlsym_func),
{ libname, nameval, libptrgv });
llvmf = lookup;
}
setName(emission_context, llvmf, f_name + StringRef(".found"));
StoreInst *store = irbuilder.CreateAlignedStore(llvmf, llvmgv, Align(sizeof(void*)));
store->setAtomic(AtomicOrdering::Release);
irbuilder.CreateBr(ccall_bb);
ccall_bb->insertInto(f);
irbuilder.SetInsertPoint(ccall_bb);
PHINode *p = irbuilder.CreatePHI(T_pvoidfunc, 2);
p->addIncoming(llvmf_orig, enter_bb);
p->addIncoming(llvmf, llvmf->getParent());
setName(emission_context, p, f_name);
return p;
}
static Value *runtime_sym_lookup(
jl_codectx_t &ctx,
PointerType *funcptype, const char *f_lib, jl_value_t *lib_expr,
const char *f_name, Function *f)
{
auto T_pvoidfunc = JuliaType::get_pvoidfunc_ty(ctx.builder.getContext());
GlobalVariable *libptrgv;
GlobalVariable *llvmgv;
bool runtime_lib;
if (lib_expr) {
// for computed library names, generate a global variable to cache the function
// pointer just for this call site.
runtime_lib = true;
libptrgv = NULL;
std::string gvname = "libname_";
gvname += f_name;
gvname += "_";
gvname += std::to_string(jl_atomic_fetch_add_relaxed(&globalUniqueGeneratedNames, 1));
llvmgv = new GlobalVariable(*jl_Module, T_pvoidfunc, false,
GlobalVariable::ExternalLinkage,
Constant::getNullValue(T_pvoidfunc), gvname);
}
else {
runtime_lib = runtime_sym_gvs(ctx, f_lib, f_name, libptrgv, llvmgv);
libptrgv = prepare_global_in(jl_Module, libptrgv);
}
llvmgv = prepare_global_in(jl_Module, llvmgv);
return runtime_sym_lookup(ctx.emission_context, ctx.builder, &ctx, funcptype, f_lib, lib_expr, f_name, f, libptrgv, llvmgv, runtime_lib);
}
// Emit a "PLT" entry that will be lazily initialized
// when being called the first time.
static GlobalVariable *emit_plt_thunk(
jl_codectx_t &ctx,
FunctionType *functype, const AttributeList &attrs,
CallingConv::ID cc, const char *f_lib, const char *f_name,
GlobalVariable *libptrgv, GlobalVariable *llvmgv,
bool runtime_lib)
{
++PLTThunks;
auto M = &ctx.emission_context.shared_module();
PointerType *funcptype = PointerType::get(functype, 0);
libptrgv = prepare_global_in(M, libptrgv);
llvmgv = prepare_global_in(M, llvmgv);
std::string fname;
raw_string_ostream(fname) << "jlplt_" << f_name << "_" << jl_atomic_fetch_add_relaxed(&globalUniqueGeneratedNames, 1);
Function *plt = Function::Create(functype,
GlobalVariable::PrivateLinkage,
fname, M);
plt->setAttributes(attrs);
if (cc != CallingConv::C)
plt->setCallingConv(cc);
auto T_pvoidfunc = JuliaType::get_pvoidfunc_ty(M->getContext());
GlobalVariable *got = new GlobalVariable(*M, T_pvoidfunc, false,
GlobalVariable::ExternalLinkage,
plt,
fname + "_got");
if (runtime_lib) {
got->addAttribute("julia.libname", f_lib);
} else {
got->addAttribute("julia.libidx", std::to_string((uintptr_t) f_lib));
}
got->addAttribute("julia.fname", f_name);
BasicBlock *b0 = BasicBlock::Create(M->getContext(), "top", plt);
IRBuilder<> irbuilder(b0);
Value *ptr = runtime_sym_lookup(ctx.emission_context, irbuilder, NULL, funcptype, f_lib, NULL, f_name, plt, libptrgv,
llvmgv, runtime_lib);
StoreInst *store = irbuilder.CreateAlignedStore(ptr, got, Align(sizeof(void*)));
store->setAtomic(AtomicOrdering::Release);
SmallVector<Value*, 16> args;
for (auto &arg : plt->args())
args.push_back(&arg);
CallInst *ret = irbuilder.CreateCall(
functype,
ptr, ArrayRef<Value*>(args));
ret->setAttributes(attrs);
if (cc != CallingConv::C)
ret->setCallingConv(cc);
// NoReturn function can trigger LLVM verifier error when declared as
// MustTail since other passes might replace the `ret` with
// `unreachable` (LLVM should probably accept `unreachable`).
if (hasFnAttr(attrs, Attribute::NoReturn)) {
irbuilder.CreateUnreachable();
}
else {
// musttail support is very bad on ARM, PPC, PPC64 (as of LLVM 3.9)
// Known failures includes vararg (not needed here) and sret.
if (ctx.emission_context.TargetTriple.isX86() || (ctx.emission_context.TargetTriple.isAArch64() && !ctx.emission_context.TargetTriple.isOSDarwin())) {
// Ref https://bugs.llvm.org/show_bug.cgi?id=47058
// LLVM, as of 10.0.1 emits wrong/worse code when musttail is set
// Apple silicon macs give an LLVM ERROR if musttail is set here #44107.
if (!attrs.hasAttrSomewhere(Attribute::ByVal))
ret->setTailCallKind(CallInst::TCK_MustTail);
}
if (functype->getReturnType() == getVoidTy(irbuilder.getContext())) {
irbuilder.CreateRetVoid();
}
else {
irbuilder.CreateRet(ret);
}
}
irbuilder.ClearInsertionPoint();
return got;
}
static Value *emit_plt(
jl_codectx_t &ctx,
FunctionType *functype,
const AttributeList &attrs,
CallingConv::ID cc, const char *f_lib, const char *f_name)
{
++PLT;
// Don't do this for vararg functions so that the `musttail` is only
// an optimization and is not required to function correctly.
assert(!functype->isVarArg());
GlobalVariable *libptrgv;
GlobalVariable *llvmgv;
bool runtime_lib = runtime_sym_gvs(ctx, f_lib, f_name, libptrgv, llvmgv);
auto &pltMap = ctx.emission_context.allPltMap[attrs];
auto key = std::make_tuple(llvmgv, functype, cc);
GlobalVariable *&sharedgot = pltMap[key];
if (!sharedgot) {
sharedgot = emit_plt_thunk(ctx,
functype, attrs, cc, f_lib, f_name, libptrgv, llvmgv, runtime_lib);
}
GlobalVariable *got = prepare_global_in(jl_Module, sharedgot);
LoadInst *got_val = ctx.builder.CreateAlignedLoad(got->getValueType(), got, Align(sizeof(void*)));
setName(ctx.emission_context, got_val, f_name);
// See comment in `runtime_sym_lookup` above. This in principle needs a
// consume ordering too. This is even less likely to cause issues though
// since the only thing we do to this loaded pointer is to call it
// immediately.
got_val->setAtomic(AtomicOrdering::Unordered);
return got_val;
}
// --- ABI Implementations ---
// Partially based on the LDC ABI implementations licensed under the BSD 3-clause license
class AbiLayout {
public:
virtual ~AbiLayout() {}
virtual bool use_sret(jl_datatype_t *ty, LLVMContext &ctx) = 0;
virtual bool needPassByRef(jl_datatype_t *ty, AttrBuilder&, LLVMContext &ctx, Type* llvm_t) = 0;
virtual Type *preferred_llvm_type(jl_datatype_t *ty, bool isret, LLVMContext &ctx) const = 0;
};
// Determine if object of bitstype ty maps to a native x86 SIMD type (__m128, __m256, or __m512) in C
static bool is_native_simd_type(jl_datatype_t *dt) {
size_t size = jl_datatype_size(dt);
if (size != 16 && size != 32 && size != 64)
// Wrong size for xmm, ymm, or zmm register.
return false;
uint32_t n = jl_datatype_nfields(dt);
if (n<2)
// Not mapped to SIMD register.
return false;
jl_value_t *ft0 = jl_field_type(dt, 0);
for (uint32_t i = 1; i < n; ++i)
if (jl_field_type(dt, i) != ft0)
// Not homogeneous
return false;
// Type is homogeneous. Check if it maps to LLVM vector.
return jl_special_vector_alignment(n, ft0) != 0;
}
#include "abi_llvm.cpp"
#include "abi_arm.cpp"
#include "abi_aarch64.cpp"
#include "abi_riscv.cpp"
#include "abi_ppc64le.cpp"
#include "abi_win32.cpp"
#include "abi_win64.cpp"
#include "abi_x86_64.cpp"
#include "abi_x86.cpp"
#if defined ABI_LLVM
typedef ABI_LLVMLayout DefaultAbiState;
#elif defined _OS_WINDOWS_
# if defined _CPU_X86_64_
typedef ABI_Win64Layout DefaultAbiState;
# elif defined _CPU_X86_
typedef ABI_Win32Layout DefaultAbiState;
# else
# error Windows is currently only supported on x86 and x86_64
# endif
#elif defined _CPU_X86_64_
typedef ABI_x86_64Layout DefaultAbiState;
#elif defined _CPU_X86_
typedef ABI_x86Layout DefaultAbiState;
#elif defined _CPU_ARM_
typedef ABI_ARMLayout DefaultAbiState;
#elif defined _CPU_AARCH64_
typedef ABI_AArch64Layout DefaultAbiState;
#elif defined _CPU_RISCV64_
typedef ABI_RiscvLayout DefaultAbiState;
#elif defined _CPU_PPC64_
typedef ABI_PPC64leLayout DefaultAbiState;
#else
# pragma message("ccall is defaulting to llvm ABI, since no platform ABI has been defined for this CPU/OS combination")
typedef ABI_LLVMLayout DefaultAbiState;
#endif
// basic type widening and cast conversions
static Value *llvm_type_rewrite(
jl_codectx_t &ctx,
Value *v, Type *target_type,
bool issigned) /* determines whether an integer value should be zero or sign extended */
{
Type *from_type = v->getType();
if (target_type == from_type)
return v;
if (from_type == getVoidTy(ctx.builder.getContext()) || isa<UndefValue>(v))
return UndefValue::get(target_type); // convert undef (unreachable) -> undef (target_type)
assert(from_type->isPointerTy() == target_type->isPointerTy()); // expect that all ABIs consider all pointers to be equivalent
if (target_type->isPointerTy())
return v;
// simple integer and float widening & conversion cases
if (from_type->getPrimitiveSizeInBits() > 0 &&
target_type->getPrimitiveSizeInBits() == from_type->getPrimitiveSizeInBits())
return emit_bitcast(ctx, v, target_type);
if (target_type->isFloatingPointTy() && from_type->isFloatingPointTy()) {
if (target_type->getPrimitiveSizeInBits() > from_type->getPrimitiveSizeInBits())
return ctx.builder.CreateFPExt(v, target_type);
else if (target_type->getPrimitiveSizeInBits() < from_type->getPrimitiveSizeInBits())
return ctx.builder.CreateFPTrunc(v, target_type);
else
return v;
}
if (target_type->isIntegerTy() && from_type->isIntegerTy()) {
if (issigned)
return ctx.builder.CreateSExtOrTrunc(v, target_type);
else
return ctx.builder.CreateZExtOrTrunc(v, target_type);
}
// one or both of from_type and target_type is a VectorType or AggregateType
// LLVM doesn't allow us to cast these values directly, so
// we need to use this alloca copy trick instead
// On ARM and AArch64, the ABI requires casting through memory to different
// sizes.
const DataLayout &DL = ctx.builder.GetInsertBlock()->getModule()->getDataLayout();
Align align = std::max(DL.getPrefTypeAlign(target_type), DL.getPrefTypeAlign(from_type));
size_t nb = std::max(DL.getTypeAllocSize(target_type), DL.getTypeAllocSize(from_type));
AllocaInst *cast = emit_static_alloca(ctx, nb, align);
setName(ctx.emission_context, cast, "type_rewrite_buffer");
ctx.builder.CreateAlignedStore(v, cast, align);
auto pun = ctx.builder.CreateAlignedLoad(target_type, cast, align);
setName(ctx.emission_context, pun, "type_rewrite");
return pun;
}
// --- argument passing and scratch space utilities ---
// Returns ctx.types().T_prjlvalue
static Value *runtime_apply_type_env(jl_codectx_t &ctx, jl_value_t *ty)
{
// box if concrete type was not statically known
Value *args[] = {
literal_pointer_val(ctx, ty),
literal_pointer_val(ctx, (jl_value_t*)ctx.linfo->def.method->sig),
emit_ptrgep(ctx, maybe_decay_tracked(ctx, ctx.spvals_ptr), sizeof(jl_svec_t))
};
auto call = ctx.builder.CreateCall(prepare_call(jlapplytype_func), ArrayRef<Value*>(args));
addRetAttr(call, Attribute::getWithAlignment(ctx.builder.getContext(), Align(16)));
return call;
}
static const std::string make_errmsg(const char *fname, int n, const char *err)
{
std::string _msg;
raw_string_ostream msg(_msg);
msg << fname;
if (n > 0) {
msg << " argument ";
msg << n;
} else
msg << " return";
msg << err;
return msg.str();
}
static jl_cgval_t typeassert_input(jl_codectx_t &ctx, const jl_cgval_t &jvinfo, jl_value_t *jlto, jl_unionall_t *jlto_env, int argn)
{
if (jlto != (jl_value_t*)jl_any_type && !jl_subtype(jvinfo.typ, jlto)) {
if (jlto == (jl_value_t*)jl_voidpointer_type) {
// allow a bit more flexibility for what can be passed to (void*) due to Ref{T} conversion behavior in input
if (!jl_is_cpointer_type(jvinfo.typ)) {
// emit a typecheck, if not statically known to be correct
emit_cpointercheck(ctx, jvinfo, make_errmsg("ccall", argn + 1, ""));
return update_julia_type(ctx, jvinfo, (jl_value_t*)jl_pointer_type);
}
}
else {
// emit a typecheck, if not statically known to be correct
std::string msg = make_errmsg("ccall", argn + 1, "");
if (!jlto_env || !jl_has_typevar_from_unionall(jlto, jlto_env)) {
emit_typecheck(ctx, jvinfo, jlto, msg);
}
else {
jl_cgval_t jlto_runtime = mark_julia_type(ctx, runtime_apply_type_env(ctx, jlto), true, jl_any_type);
Value *vx = boxed(ctx, jvinfo);
Value *istype = ctx.builder.CreateICmpNE(
ctx.builder.CreateCall(prepare_call(jlisa_func), { vx, boxed(ctx, jlto_runtime) }),
ConstantInt::get(getInt32Ty(ctx.builder.getContext()), 0));
setName(ctx.emission_context, istype, "istype");
BasicBlock *failBB = BasicBlock::Create(ctx.builder.getContext(), "fail", ctx.f);
BasicBlock *passBB = BasicBlock::Create(ctx.builder.getContext(), "pass", ctx.f);
ctx.builder.CreateCondBr(istype, passBB, failBB);
ctx.builder.SetInsertPoint(failBB);
just_emit_type_error(ctx, mark_julia_type(ctx, vx, true, jl_any_type), boxed(ctx, jlto_runtime), msg);
ctx.builder.CreateUnreachable();
ctx.builder.SetInsertPoint(passBB);
}
return update_julia_type(ctx, jvinfo, jlto);
}
}
return jvinfo;
}
// Emit code to convert argument to form expected by C ABI
// to = desired LLVM type
// jlto = Julia type of formal argument
// jvinfo = value of actual argument
static Value *julia_to_native(
jl_codectx_t &ctx,
Type *to, bool toboxed, jl_value_t *jlto, jl_unionall_t *jlto_env,
jl_cgval_t jvinfo,
bool byRef, int argn)
{
// We're passing Any
if (toboxed) {
assert(!byRef); // don't expect any ABI to pass pointers by pointer
return boxed(ctx, jvinfo);
}
assert(jl_is_datatype(jlto) && jl_struct_try_layout((jl_datatype_t*)jlto));
jvinfo = typeassert_input(ctx, jvinfo, jlto, jlto_env, argn);
if (!byRef)
return emit_unbox(ctx, to, jvinfo, jlto);
// pass the address of an alloca'd thing, not a box
// since those are immutable.
Align align(julia_alignment(jlto));
Value *slot = emit_static_alloca(ctx, to, align);
setName(ctx.emission_context, slot, "native_convert_buffer");
emit_unbox_store(ctx, jvinfo, slot, ctx.tbaa().tbaa_stack, align);
return slot;
}
typedef struct {
Value *jl_ptr; // if the argument is a run-time computed pointer
void (*fptr)(void); // if the argument is a constant pointer
const char *f_name; // if the symbol name is known
const char *f_lib; // if a library name is specified
jl_value_t *lib_expr; // expression to compute library path lazily
jl_value_t *gcroot;
} native_sym_arg_t;
static inline const char *invalid_symbol_err_msg(bool ccall)
{
return ccall ?
"ccall: first argument not a pointer or valid constant expression" :
"cglobal: first argument not a pointer or valid constant expression";
}
// --- parse :sym or (:sym, :lib) argument into address info ---
static void interpret_symbol_arg(jl_codectx_t &ctx, native_sym_arg_t &out, jl_value_t *arg, bool ccall, bool llvmcall)
{
Value *&jl_ptr = out.jl_ptr;
void (*&fptr)(void) = out.fptr;
const char *&f_name = out.f_name;
const char *&f_lib = out.f_lib;
jl_value_t *ptr = static_eval(ctx, arg);
if (ptr == NULL) {
if (jl_is_expr(arg) && ((jl_expr_t*)arg)->head == jl_call_sym && jl_expr_nargs(arg) == 3 &&
jl_is_globalref(jl_exprarg(arg,0)) && jl_globalref_mod(jl_exprarg(arg,0)) == jl_core_module &&
jl_globalref_name(jl_exprarg(arg,0)) == jl_symbol("tuple")) {
// attempt to interpret a non-constant 2-tuple expression as (func_name, lib_name()), where
// `lib_name()` will be executed when first used.
jl_value_t *name_val = static_eval(ctx, jl_exprarg(arg,1));
if (name_val && jl_is_symbol(name_val)) {
f_name = jl_symbol_name((jl_sym_t*)name_val);
out.lib_expr = jl_exprarg(arg, 2);
return;
}
else if (name_val && jl_is_string(name_val)) {
f_name = jl_string_data(name_val);
out.gcroot = name_val;
out.lib_expr = jl_exprarg(arg, 2);
return;
}
}
jl_cgval_t arg1 = emit_expr(ctx, arg);
jl_value_t *ptr_ty = arg1.typ;
if (!jl_is_cpointer_type(ptr_ty)) {
if (!ccall)
return;
const char *errmsg = invalid_symbol_err_msg(ccall);
emit_cpointercheck(ctx, arg1, errmsg);
}
arg1 = update_julia_type(ctx, arg1, (jl_value_t*)jl_voidpointer_type);
jl_ptr = emit_unbox(ctx, ctx.types().T_ptr, arg1, (jl_value_t*)jl_voidpointer_type);
}
else {
out.gcroot = ptr;
if (jl_is_tuple(ptr) && jl_nfields(ptr) == 1) {
ptr = jl_fieldref(ptr, 0);
}
if (jl_is_symbol(ptr))
f_name = jl_symbol_name((jl_sym_t*)ptr);
else if (jl_is_string(ptr))
f_name = jl_string_data(ptr);
if (f_name != NULL) {
// just symbol, default to JuliaDLHandle
// will look in process symbol table
if (!llvmcall) {
void *symaddr;
std::string iname("i");
iname += f_name;
if (jl_dlsym(jl_libjulia_internal_handle, iname.c_str(), &symaddr, 0)) {
f_lib = JL_LIBJULIA_INTERNAL_DL_LIBNAME;
f_name = jl_symbol_name(jl_symbol(iname.c_str()));
}
else {
f_lib = jl_dlfind(f_name);
}
}
}
else if (jl_is_cpointer_type(jl_typeof(ptr))) {
fptr = *(void(**)(void))jl_data_ptr(ptr);
}
else if (jl_is_tuple(ptr) && jl_nfields(ptr) > 1) {
jl_value_t *t0 = jl_fieldref(ptr, 0);
if (jl_is_symbol(t0))
f_name = jl_symbol_name((jl_sym_t*)t0);
else if (jl_is_string(t0))
f_name = jl_string_data(t0);
jl_value_t *t1 = jl_fieldref(ptr, 1);
if (jl_is_symbol(t1))
f_lib = jl_symbol_name((jl_sym_t*)t1);
else if (jl_is_string(t1))
f_lib = jl_string_data(t1);
else {
out.lib_expr = t1;
}
}
}
}
// --- code generator for cglobal ---
static jl_cgval_t emit_runtime_call(jl_codectx_t &ctx, JL_I::intrinsic f, ArrayRef<jl_cgval_t> argv, size_t nargs);
static jl_cgval_t emit_cglobal(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
{
++EmittedCGlobals;
JL_NARGS(cglobal, 1, 2);
jl_value_t *rt = NULL;
Value *res;
native_sym_arg_t sym = {};
JL_GC_PUSH2(&rt, &sym.gcroot);
if (nargs == 2) {
rt = static_eval(ctx, args[2]);
if (rt == NULL) {
JL_GC_POP();
jl_cgval_t argv[2];
argv[0] = emit_expr(ctx, args[1]);
argv[1] = emit_expr(ctx, args[2]);
return emit_runtime_call(ctx, JL_I::cglobal, argv, nargs);
}
JL_TYPECHK(cglobal, type, rt);
rt = (jl_value_t*)jl_apply_type1((jl_value_t*)jl_pointer_type, rt);
}
else {
rt = (jl_value_t*)jl_voidpointer_type;
}
Type *lrt = ctx.types().T_ptr;
assert(lrt == julia_type_to_llvm(ctx, rt));
interpret_symbol_arg(ctx, sym, args[1], /*ccall=*/false, false);
if (sym.jl_ptr != NULL) {
res = sym.jl_ptr;
}
else if (sym.fptr != NULL) {
res = ConstantInt::get(lrt, (uint64_t)sym.fptr);
}
else if (sym.f_name != NULL) {
if (sym.lib_expr) {
res = runtime_sym_lookup(ctx, getPointerTy(ctx.builder.getContext()), NULL, sym.lib_expr, sym.f_name, ctx.f);
}
else {
res = runtime_sym_lookup(ctx, getPointerTy(ctx.builder.getContext()), sym.f_lib, NULL, sym.f_name, ctx.f);
}
} else {
// Fall back to runtime intrinsic
JL_GC_POP();
jl_cgval_t argv[2];
argv[0] = emit_expr(ctx, args[1]);
if (nargs == 2)
argv[1] = emit_expr(ctx, args[2]);
return emit_runtime_call(ctx, nargs == 1 ? JL_I::cglobal_auto : JL_I::cglobal, argv, nargs);
}
JL_GC_POP();
return mark_julia_type(ctx, res, false, rt);
}
// --- code generator for llvmcall ---
static jl_cgval_t emit_llvmcall(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
{
++EmittedLLVMCalls;
// parse and validate arguments
//
// two forms of llvmcall are supported:
// - llvmcall(ir, (rettypes...), (argtypes...), args...)
// where `ir` represents IR that should be pasted in a function body
// - llvmcall((mod, fn), (rettypes...), (argtypes...), args...)
// where `mod` represents the assembly of an entire LLVM module,
// and `fn` the name of the function to call
JL_NARGSV(llvmcall, 3);
jl_value_t *rt = NULL, *at = NULL, *ir = NULL, *entry = NULL;
jl_value_t *ir_arg = args[1];
JL_GC_PUSH4(&ir, &rt, &at, &entry);
if (jl_is_ssavalue(ir_arg))
ir_arg = jl_array_ptr_ref((jl_array_t*)ctx.source->code, ((jl_ssavalue_t*)ir_arg)->id - 1);
ir = static_eval(ctx, ir_arg);
if (!ir) {
emit_error(ctx, "error statically evaluating llvm IR argument");
JL_GC_POP();
return jl_cgval_t();
}
if (jl_is_ssavalue(args[2]) && !jl_is_long(ctx.source->ssavaluetypes)) {
jl_value_t *rtt = jl_array_ptr_ref((jl_array_t*)ctx.source->ssavaluetypes, ((jl_ssavalue_t*)args[2])->id - 1);
if (jl_is_type_type(rtt))
rt = jl_tparam0(rtt);
}
if (!rt) {
rt = static_eval(ctx, args[2]);
if (!rt) {
emit_error(ctx, "error statically evaluating llvmcall return type");
JL_GC_POP();
return jl_cgval_t();
}
}
if (jl_is_ssavalue(args[3]) && !jl_is_long(ctx.source->ssavaluetypes)) {
jl_value_t *att = jl_array_ptr_ref((jl_array_t*)ctx.source->ssavaluetypes, ((jl_ssavalue_t*)args[3])->id - 1);
if (jl_is_type_type(att))
at = jl_tparam0(att);
}
if (!at) {
at = static_eval(ctx, args[3]);
if (!at) {
emit_error(ctx, "error statically evaluating llvmcall argument tuple");
JL_GC_POP();
return jl_cgval_t();
}
}
if (jl_is_tuple(ir)) {
// if the IR is a tuple, we expect (mod, fn)
if (jl_nfields(ir) != 2) {
emit_error(ctx, "Tuple as first argument to llvmcall must have exactly two children");
JL_GC_POP();
return jl_cgval_t();
}
entry = jl_fieldref(ir, 1);
if (!jl_is_string(entry)) {
emit_error(ctx, "Function name passed to llvmcall must be a string");
JL_GC_POP();
return jl_cgval_t();
}
ir = jl_fieldref(ir, 0);
if (!jl_is_string(ir) && !jl_typetagis(ir, jl_array_uint8_type)) {
emit_error(ctx, "Module IR passed to llvmcall must be a string or an array of bytes");
JL_GC_POP();
return jl_cgval_t();
}
}
else {
if (!jl_is_string(ir)) {
emit_error(ctx, "Function IR passed to llvmcall must be a string");
JL_GC_POP();
return jl_cgval_t();
}
}
JL_TYPECHK(llvmcall, type, rt);
JL_TYPECHK(llvmcall, type, at);
// Determine argument types
//
// Semantics for arguments are as follows:
// If the argument type is immutable (including bitstype), we pass the loaded llvm value
// type. Otherwise we pass a pointer to a jl_value_t.
jl_svec_t *tt = ((jl_datatype_t *)at)->parameters;
size_t nargt = jl_svec_len(tt);
SmallVector<llvm::Type*, 0> argtypes;
SmallVector<Value *, 8> argvals(nargt);
for (size_t i = 0; i < nargt; ++i) {
jl_value_t *tti = jl_svecref(tt,i);
bool toboxed;
Type *t = julia_type_to_llvm(ctx, tti, &toboxed);
argtypes.push_back(t);
if (4 + i > nargs) {
emit_error(ctx, "Missing arguments to llvmcall!");
JL_GC_POP();
return jl_cgval_t();
}
jl_value_t *argi = args[4 + i];
jl_cgval_t arg = emit_expr(ctx, argi);
Value *v = julia_to_native(ctx, t, toboxed, tti, NULL, arg, false, i);
bool issigned = jl_signed_type && jl_subtype(tti, (jl_value_t*)jl_signed_type);
argvals[i] = llvm_type_rewrite(ctx, v, t, issigned);
}
// Determine return type
jl_value_t *rtt = rt;
bool retboxed;
Type *rettype = julia_type_to_llvm(ctx, rtt, &retboxed);
// Make sure to find a unique name
std::string ir_name;
while (true) {
raw_string_ostream(ir_name)
<< (ctx.f->getName().str()) << "u"
<< jl_atomic_fetch_add_relaxed(&globalUniqueGeneratedNames, 1);
if (jl_Module->getFunction(ir_name) == NULL)
break;
}
// generate a temporary module that contains our IR
std::unique_ptr<Module> Mod;
bool shouldDiscardValueNames = ctx.builder.getContext().shouldDiscardValueNames();
Function *f;
if (entry == NULL) {
// we only have function IR, which we should put in a function
// stringify arguments
std::string arguments;
raw_string_ostream argstream(arguments);
for (SmallVector<Type *, 0>::iterator it = argtypes.begin(); it != argtypes.end(); ++it) {
if (it != argtypes.begin())
argstream << ",";
(*it)->print(argstream);
argstream << " ";
}
// stringify return type
std::string rstring;
raw_string_ostream rtypename(rstring);
rettype->print(rtypename);
// generate IR function definition
std::string ir_string;
raw_string_ostream ir_stream(ir_string);
ir_stream << "define " << rtypename.str() << " @\"" << ir_name << "\"("
<< argstream.str() << ") {\n"
<< jl_string_data(ir) << "\n}";
SMDiagnostic Err = SMDiagnostic();
ctx.builder.getContext().setDiscardValueNames(false);
Mod = parseAssemblyString(ir_stream.str(), Err, ctx.builder.getContext());
ctx.builder.getContext().setDiscardValueNames(shouldDiscardValueNames);
// backwards compatibility: support for IR with integer pointers
if (!Mod) {
std::string compat_arguments;
raw_string_ostream compat_argstream(compat_arguments);
for (size_t i = 0; i < nargt; ++i) {
if (i > 0)
compat_argstream << ",";
jl_value_t *tti = jl_svecref(tt, i);
Type *t;
if (jl_is_cpointer_type(tti))
t = ctx.types().T_size;
else
t = argtypes[i];
t->print(compat_argstream);
compat_argstream << " ";
}
std::string compat_rstring;
raw_string_ostream compat_rtypename(compat_rstring);
if (jl_is_cpointer_type(rtt))
ctx.types().T_size->print(compat_rtypename);
else
rettype->print(compat_rtypename);
std::string compat_ir_string;
raw_string_ostream compat_ir_stream(compat_ir_string);
compat_ir_stream << "define " << compat_rtypename.str() << " @\"" << ir_name
<< "\"(" << compat_argstream.str() << ") {\n"
<< jl_string_data(ir) << "\n}";
SMDiagnostic Err = SMDiagnostic();
ctx.builder.getContext().setDiscardValueNames(false);
Mod = parseAssemblyString(compat_ir_stream.str(), Err, ctx.builder.getContext());
ctx.builder.getContext().setDiscardValueNames(shouldDiscardValueNames);
}
if (!Mod) {
std::string message = "Failed to parse LLVM assembly: \n";
raw_string_ostream stream(message);
Err.print("", stream, true);
emit_error(ctx, stream.str());
JL_GC_POP();
return jl_cgval_t();
}
f = Mod->getFunction(ir_name);
f->addFnAttr(Attribute::AlwaysInline);
}
else {
// we have the IR or bitcode of an entire module, which we can parse directly
if (jl_is_string(ir)) {
SMDiagnostic Err = SMDiagnostic();
ctx.builder.getContext().setDiscardValueNames(false);
Mod = parseAssemblyString(jl_string_data(ir), Err, ctx.builder.getContext());
ctx.builder.getContext().setDiscardValueNames(shouldDiscardValueNames);
if (!Mod) {
std::string message = "Failed to parse LLVM assembly: \n";
raw_string_ostream stream(message);
Err.print("", stream, true);
emit_error(ctx, stream.str());
JL_GC_POP();
return jl_cgval_t();
}
}
else {
auto Buf = MemoryBuffer::getMemBuffer(
StringRef(jl_array_data(ir, char), jl_array_nrows(ir)), "llvmcall",
/*RequiresNullTerminator*/ false);
Expected<std::unique_ptr<Module>> ModuleOrErr =
parseBitcodeFile(*Buf, ctx.builder.getContext());
if (Error Err = ModuleOrErr.takeError()) {
std::string Message;
handleAllErrors(std::move(Err),
[&](ErrorInfoBase &EIB) { Message = EIB.message(); });
std::string message = "Failed to parse LLVM bitcode: \n";
raw_string_ostream stream(message);
stream << Message;
emit_error(ctx, stream.str());
JL_GC_POP();
return jl_cgval_t();
}
Mod = std::move(ModuleOrErr.get());
}
f = Mod->getFunction(jl_string_data(entry));
if (!f) {
emit_error(ctx, "Module IR does not contain specified entry function");
JL_GC_POP();
return jl_cgval_t();
}
assert(!f->isDeclaration());
f->setName(ir_name);
}
// backwards compatibility: support for IR with integer pointers
bool mismatched_pointers = false;
for (size_t i = 0; i < nargt; ++i) {
jl_value_t *tti = jl_svecref(tt, i);
if (jl_is_cpointer_type(tti) &&
!f->getFunctionType()->getParamType(i)->isPointerTy()) {
mismatched_pointers = true;
break;
}
}
if (mismatched_pointers) {
if (jl_options.depwarn) {
if (jl_options.depwarn == JL_OPTIONS_DEPWARN_ERROR)
jl_error("llvmcall with integer pointers is deprecated, "
"use an actual pointer type instead.");
// ensure we only depwarn once per method
// TODO: lift this into a reusable codegen-level depwarn utility
static std::set<jl_method_t*> llvmcall_depwarns;
jl_method_t *m = ctx.linfo->def.method;
if (llvmcall_depwarns.find(m) == llvmcall_depwarns.end()) {
llvmcall_depwarns.insert(m);
jl_printf(JL_STDERR,
"WARNING: llvmcall with integer pointers is deprecated.\n"
"Use actual pointers instead, replacing i32 or i64 with i8* or ptr\n"
"in ");
jl_static_show(JL_STDERR, (jl_value_t*) ctx.linfo->def.method);
jl_printf(JL_STDERR, " at %s\n", ctx.file.str().c_str());