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ccall.cpp
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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 ---
// Map from symbol name (in a certain library) to its GV in sysimg and the
// DL handle address in the current session.
typedef StringMap<std::pair<GlobalVariable*,void*>> SymMapGV;
static StringMap<std::pair<GlobalVariable*,SymMapGV>> libMapGV;
#ifdef _OS_WINDOWS_
static SymMapGV symMapExe;
static SymMapGV symMapDl;
#endif
static SymMapGV symMapDefault;
template<typename Func>
struct LazyModule {
Func func;
Module *m;
template<typename Func2>
LazyModule(Func2 &&func)
: func(std::forward<Func2>(func)),
m(nullptr)
{}
Module *get()
{
if (!m)
m = func();
return m;
}
Module &operator*()
{
return *get();
}
};
template<typename Func>
static LazyModule<typename std::remove_reference<Func>::type>
lazyModule(Func &&func)
{
return LazyModule<typename std::remove_reference<Func>::type>(
std::forward<Func>(func));
}
// Find or create the GVs for the library and symbol lookup.
// Return `runtime_lib` (whether the library name is a string)
// Optionally return the symbol address in the current session
// when `symaddr != nullptr`.
// The `lib` and `sym` GV returned may not be in the current module.
template<typename MT>
static bool runtime_sym_gvs(const char *f_lib, const char *f_name, MT &&M,
GlobalVariable *&lib, GlobalVariable *&sym,
void **symaddr=nullptr)
{
void *libsym = NULL;
bool runtime_lib = false;
GlobalVariable *libptrgv;
SymMapGV *symMap;
#ifdef _OS_WINDOWS_
if ((intptr_t)f_lib == 1) {
libptrgv = jlexe_var;
libsym = jl_exe_handle;
symMap = &symMapExe;
}
else if ((intptr_t)f_lib == 2) {
libptrgv = jldll_var;
libsym = jl_dl_handle;
symMap = &symMapDl;
}
else
#endif
if (f_lib == NULL) {
libptrgv = jlRTLD_DEFAULT_var;
libsym = jl_RTLD_DEFAULT_handle;
symMap = &symMapDefault;
}
else {
std::string name = "ccalllib_";
name += f_lib;
runtime_lib = true;
auto iter = libMapGV.find(f_lib);
if (iter == libMapGV.end()) {
libptrgv = new GlobalVariable(*M, T_pint8, false,
GlobalVariable::ExternalLinkage,
NULL, name);
auto &libgv = libMapGV[f_lib];
libgv = std::make_pair(global_proto(libptrgv), SymMapGV());
symMap = &libgv.second;
libsym = jl_get_library(f_lib);
assert(libsym != NULL);
*(void**)jl_emit_and_add_to_shadow(libptrgv) = libsym;
}
else {
libptrgv = iter->second.first;
symMap = &iter->second.second;
}
}
if (libsym == NULL) {
libsym = *(void**)jl_get_globalvar(libptrgv);
}
assert(libsym != NULL);
GlobalVariable *llvmgv;
auto sym_iter = symMap->find(f_name);
if (sym_iter == symMap->end()) {
// MCJIT forces this to have external linkage eventually, so we would clobber
// the symbol of the actual function.
std::string name = "ccall_";
name += f_name;
name += "_";
name += std::to_string(globalUnique++);
llvmgv = new GlobalVariable(*M, T_pvoidfunc, false,
GlobalVariable::ExternalLinkage, NULL, name);
llvmgv = global_proto(llvmgv);
void *addr = jl_dlsym_e(libsym, f_name);
(*symMap)[f_name] = std::make_pair(llvmgv, addr);
if (symaddr)
*symaddr = addr;
*(void**)jl_emit_and_add_to_shadow(llvmgv) = addr;
}
else {
if (symaddr)
*symaddr = sym_iter->second.second;
llvmgv = sym_iter->second.first;
}
lib = libptrgv;
sym = llvmgv;
return runtime_lib;
}
static Value *runtime_sym_lookup(
IRBuilder<> &irbuilder,
PointerType *funcptype, const char *f_lib,
const char *f_name, Function *f,
GlobalVariable *libptrgv,
GlobalVariable *llvmgv, bool runtime_lib)
{
// 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)
BasicBlock *enter_bb = irbuilder.GetInsertBlock();
BasicBlock *dlsym_lookup = BasicBlock::Create(jl_LLVMContext, "dlsym");
BasicBlock *ccall_bb = BasicBlock::Create(jl_LLVMContext, "ccall");
Constant *initnul = ConstantPointerNull::get((PointerType*)T_pvoidfunc);
LoadInst *llvmf_orig = irbuilder.CreateAlignedLoad(llvmgv, sizeof(void*));
// 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::Consume);
irbuilder.CreateCondBr(
irbuilder.CreateICmpNE(llvmf_orig, initnul),
ccall_bb,
dlsym_lookup);
assert(f->getParent() != NULL);
f->getBasicBlockList().push_back(dlsym_lookup);
irbuilder.SetInsertPoint(dlsym_lookup);
Value *libname;
if (runtime_lib) {
libname = stringConstPtr(irbuilder, f_lib);
}
else {
// f_lib is actually one of the special sentinel values
libname = ConstantExpr::getIntToPtr(ConstantInt::get(T_size, (uintptr_t)f_lib), T_pint8);
}
Value *llvmf = irbuilder.CreateCall(prepare_call_in(jl_builderModule(irbuilder), jldlsym_func),
{ libname, stringConstPtr(irbuilder, f_name), libptrgv });
auto store = irbuilder.CreateAlignedStore(llvmf, llvmgv, sizeof(void*));
store->setAtomic(AtomicOrdering::Release);
irbuilder.CreateBr(ccall_bb);
f->getBasicBlockList().push_back(ccall_bb);
irbuilder.SetInsertPoint(ccall_bb);
PHINode *p = irbuilder.CreatePHI(T_pvoidfunc, 2);
p->addIncoming(llvmf_orig, enter_bb);
p->addIncoming(llvmf, dlsym_lookup);
return irbuilder.CreateBitCast(p, funcptype);
}
static Value *runtime_sym_lookup(
jl_codectx_t &ctx,
PointerType *funcptype, const char *f_lib,
const char *f_name, Function *f)
{
GlobalVariable *libptrgv;
GlobalVariable *llvmgv;
bool runtime_lib = runtime_sym_gvs(f_lib, f_name, f->getParent(),
libptrgv, llvmgv);
libptrgv = prepare_global(libptrgv);
llvmgv = prepare_global(llvmgv);
return runtime_sym_lookup(ctx.builder, funcptype, f_lib, f_name, f, libptrgv, llvmgv,
runtime_lib);
}
// Map from distinct callee's to its GOT entry.
// In principle the attribute, function type and calling convention
// don't need to be part of the key but it seems impossible to forward
// all the arguments without writing assembly directly.
// This doesn't matter too much in reality since a single function is usually
// not called with multiple signatures.
#if JL_LLVM_VERSION >= 50000
static DenseMap<AttributeList,
#else
static DenseMap<AttributeSet,
#endif
std::map<std::tuple<GlobalVariable*,FunctionType*,
CallingConv::ID>,GlobalVariable*>> allPltMap;
// Emit a "PLT" entry that will be lazily initialized
// when being called the first time.
static GlobalVariable *emit_plt_thunk(
Module *M, FunctionType *functype,
#if JL_LLVM_VERSION >= 50000
const AttributeList &attrs,
#else
const AttributeSet &attrs,
#endif
CallingConv::ID cc, const char *f_lib, const char *f_name,
GlobalVariable *libptrgv, GlobalVariable *llvmgv,
void *symaddr, bool runtime_lib)
{
PointerType *funcptype = PointerType::get(functype, 0);
libptrgv = prepare_global_in(M, libptrgv);
llvmgv = prepare_global_in(M, llvmgv);
std::stringstream funcName;
funcName << "jlplt_" << f_name << "_" << globalUnique++;
auto fname = funcName.str();
Function *plt = Function::Create(functype,
GlobalVariable::ExternalLinkage,
fname, M);
jl_init_function(plt);
plt->setAttributes(attrs);
if (cc != CallingConv::C)
plt->setCallingConv(cc);
funcName << "_got";
auto gname = funcName.str();
GlobalVariable *got = new GlobalVariable(*M, T_pvoidfunc, false,
GlobalVariable::ExternalLinkage,
nullptr, gname);
*(void**)jl_emit_and_add_to_shadow(got) = symaddr;
BasicBlock *b0 = BasicBlock::Create(jl_LLVMContext, "top", plt);
IRBuilder<> irbuilder(b0);
Value *ptr = runtime_sym_lookup(irbuilder, funcptype, f_lib, f_name, plt, libptrgv,
llvmgv, runtime_lib);
auto store = irbuilder.CreateAlignedStore(irbuilder.CreateBitCast(ptr, T_pvoidfunc), got, sizeof(void*));
store->setAtomic(AtomicOrdering::Release);
SmallVector<Value*, 16> args;
for (Function::arg_iterator arg = plt->arg_begin(), arg_e = plt->arg_end(); arg != arg_e; ++arg)
args.push_back(&*arg);
CallInst *ret = irbuilder.CreateCall(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 JL_LLVM_VERSION >= 50000
if (attrs.hasAttribute(AttributeList::FunctionIndex,
#else
if (attrs.hasAttribute(AttributeSet::FunctionIndex,
#endif
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 (defined(_CPU_X86_) || defined(_CPU_X86_64_) || \
defined(_CPU_AARCH64_))
ret->setTailCallKind(CallInst::TCK_MustTail);
#endif
if (functype->getReturnType() == T_void) {
irbuilder.CreateRetVoid();
}
else {
irbuilder.CreateRet(ret);
}
}
irbuilder.ClearInsertionPoint();
got = global_proto(got); // exchange got for the permanent global before jl_finalize_module destroys it
jl_finalize_module(M, true);
auto shadowgot =
cast<GlobalVariable>(shadow_output->getNamedValue(gname));
auto shadowplt = cast<Function>(shadow_output->getNamedValue(fname));
shadowgot->setInitializer(ConstantExpr::getBitCast(shadowplt,
T_pvoidfunc));
return got;
}
static Value *emit_plt(
jl_codectx_t &ctx,
FunctionType *functype,
#if JL_LLVM_VERSION >= 50000
const AttributeList &attrs,
#else
const AttributeSet &attrs,
#endif
CallingConv::ID cc, const char *f_lib, const char *f_name)
{
assert(imaging_mode);
// 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;
void *symaddr;
auto LM = lazyModule([&] {
Module *m = new Module(f_name, jl_LLVMContext);
jl_setup_module(m);
return m;
});
bool runtime_lib = runtime_sym_gvs(f_lib, f_name, LM,
libptrgv, llvmgv, &symaddr);
PointerType *funcptype = PointerType::get(functype, 0);
auto &pltMap = allPltMap[attrs];
auto key = std::make_tuple(llvmgv, functype, cc);
GlobalVariable *&shadowgot = pltMap[key];
if (!shadowgot) {
shadowgot = emit_plt_thunk(LM.get(), functype, attrs, cc, f_lib, f_name, libptrgv, llvmgv, symaddr, runtime_lib);
}
else {
// `runtime_sym_gvs` shouldn't have created anything in a new module
// if it returns a GV that already exists.
assert(!LM.m);
}
GlobalVariable *got = prepare_global(shadowgot);
LoadInst *got_val = ctx.builder.CreateAlignedLoad(got, sizeof(void*));
// 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::Consume);
return ctx.builder.CreateBitCast(got_val, funcptype);
}
// --- 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) = 0;
virtual bool needPassByRef(jl_datatype_t *ty, AttrBuilder&) = 0;
virtual Type *preferred_llvm_type(jl_datatype_t *ty, bool isret) 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_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 _CPU_X86_64_
# if defined _OS_WINDOWS_
typedef ABI_Win64Layout DefaultAbiState;
# else
typedef ABI_x86_64Layout DefaultAbiState;
# endif
#elif defined _CPU_X86_
# if defined _OS_WINDOWS_
typedef ABI_Win32Layout DefaultAbiState;
# else
typedef ABI_x86Layout DefaultAbiState;
# endif
#elif defined _CPU_ARM_
typedef ABI_ARMLayout DefaultAbiState;
#elif defined _CPU_AARCH64_
typedef ABI_AArch64Layout DefaultAbiState;
#elif defined _CPU_PPC64_
typedef ABI_PPC64leLayout DefaultAbiState;
#else
# warning "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 == T_void || 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 emit_bitcast(ctx, v, target_type);
// 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.
Value *from;
Value *to;
#if JL_LLVM_VERSION >= 40000
const DataLayout &DL = jl_data_layout;
#else
const DataLayout &DL = jl_ExecutionEngine->getDataLayout();
#endif
if (DL.getTypeAllocSize(target_type) >= DL.getTypeAllocSize(from_type)) {
to = emit_static_alloca(ctx, target_type);
from = emit_bitcast(ctx, to, from_type->getPointerTo());
}
else {
from = emit_static_alloca(ctx, from_type);
to = emit_bitcast(ctx, from, target_type->getPointerTo());
}
ctx.builder.CreateStore(v, from);
return ctx.builder.CreateLoad(to);
}
// --- argument passing and scratch space utilities ---
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),
ctx.builder.CreateInBoundsGEP(
T_prjlvalue,
ctx.spvals_ptr,
ConstantInt::get(T_size, sizeof(jl_svec_t) / sizeof(jl_value_t*)))
};
return ctx.builder.CreateCall(prepare_call(jlapplytype_func), makeArrayRef(args));
}
static const std::string make_errmsg(const char *fname, int n, const char *err)
{
std::stringstream msg;
msg << fname;
if (n > 0)
msg << " argument " << n;
else
msg << " return";
msg << err;
return msg.str();
}
static void typeassert_input(jl_codectx_t &ctx, const jl_cgval_t &jvinfo, jl_value_t *jlto, jl_unionall_t *jlto_env, int argn, bool addressOf)
{
if (jlto != (jl_value_t*)jl_any_type && !jl_subtype(jvinfo.typ, jlto)) {
if (!addressOf && 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, ""));
}
}
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(T_int32, 0));
BasicBlock *failBB = BasicBlock::Create(jl_LLVMContext, "fail", ctx.f);
BasicBlock *passBB = BasicBlock::Create(jl_LLVMContext, "pass", ctx.f);
ctx.builder.CreateCondBr(istype, passBB, failBB);
ctx.builder.SetInsertPoint(failBB);
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);
}
}
}
}
static Value *julia_to_address(
jl_codectx_t &ctx,
Type *to, jl_value_t *jlto, jl_unionall_t *jlto_env,
const jl_cgval_t &jvinfo,
int argn, bool *needStackRestore)
{
assert(jl_is_datatype(jlto) && julia_struct_has_layout((jl_datatype_t*)jlto, jlto_env));
if (!jl_is_cpointer_type(jlto) || to != T_size) {
emit_error(ctx, "ccall: & on argument was not matched by Ptr{T} argument type");
return UndefValue::get(to);
}
jl_value_t *ety;
if (jlto == (jl_value_t*)jl_voidpointer_type) {
ety = jvinfo.typ; // skip the type-check
}
else {
ety = jl_tparam0(jlto);
typeassert_input(ctx, jvinfo, ety, jlto_env, argn, true);
}
if (jvinfo.isboxed) {
if (!jl_is_abstracttype(ety)) {
if (jl_is_mutable_datatype(ety)) {
// no copy, just reference the data field
return ctx.builder.CreateBitCast(emit_pointer_from_objref(ctx, data_pointer(ctx, jvinfo)), to);
}
else if (jl_is_immutable_datatype(ety) && jlto != (jl_value_t*)jl_voidpointer_type) { // anything declared `struct`, except Ptr{Cvoid}
// yes copy
Value *nbytes;
AllocaInst *ai;
if (((jl_datatype_t*)ety)->layout) {
int nb = jl_datatype_size(ety);
nbytes = ConstantInt::get(T_int32, nb);
ai = emit_static_alloca(ctx, T_int8, nb);
}
else {
nbytes = emit_datatype_size(ctx, emit_typeof_boxed(ctx, jvinfo));
ai = ctx.builder.CreateAlloca(T_int8, nbytes);
*needStackRestore = true;
}
ai->setAlignment(16);
// minimum gc-alignment in julia is pointer size
emit_memcpy(ctx, ai, jvinfo, nbytes, sizeof(void*));
return ctx.builder.CreatePtrToInt(ai, to);
}
}
// emit maybe copy
*needStackRestore = true;
Value *jvt = emit_typeof_boxed(ctx, jvinfo);
BasicBlock *mutableBB = BasicBlock::Create(jl_LLVMContext, "is-mutable", ctx.f);
BasicBlock *immutableBB = BasicBlock::Create(jl_LLVMContext, "is-immutable", ctx.f);
BasicBlock *afterBB = BasicBlock::Create(jl_LLVMContext, "after", ctx.f);
Value *ismutable = emit_datatype_mutabl(ctx, jvt);
ctx.builder.CreateCondBr(ismutable, mutableBB, immutableBB);
ctx.builder.SetInsertPoint(mutableBB);
Value *p1 = ctx.builder.CreateBitCast(emit_pointer_from_objref(ctx, data_pointer(ctx, jvinfo)), to);
ctx.builder.CreateBr(afterBB);
ctx.builder.SetInsertPoint(immutableBB);
Value *nbytes = emit_datatype_size(ctx, jvt);
AllocaInst *ai = ctx.builder.CreateAlloca(T_int8, nbytes);
ai->setAlignment(16);
emit_memcpy(ctx, ai, jvinfo, nbytes, sizeof(void*)); // minimum gc-alignment in julia is pointer size
Value *p2 = ctx.builder.CreatePtrToInt(ai, to);
ctx.builder.CreateBr(afterBB);
ctx.builder.SetInsertPoint(afterBB);
PHINode *p = ctx.builder.CreatePHI(to, 2);
p->addIncoming(p1, mutableBB);
p->addIncoming(p2, immutableBB);
return p;
}
Type *slottype = julia_struct_to_llvm(jvinfo.typ, NULL, NULL);
// pass the address of an alloca'd thing, not a box
// since those are immutable.
Value *slot = emit_static_alloca(ctx, slottype);
if (!jvinfo.ispointer()) {
ctx.builder.CreateStore(emit_unbox(ctx, slottype, jvinfo, ety), slot);
}
else {
emit_memcpy(ctx, slot, jvinfo, jl_datatype_size(ety), jl_datatype_align(ety));
}
return ctx.builder.CreatePtrToInt(slot, to);
}
// 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,
const jl_cgval_t &jvinfo,
bool byRef, int argn,
bool *needStackRestore)
{
// We're passing Any
if (toboxed) {
assert(!byRef); // don't expect any ABI to pass pointers by pointer
return maybe_decay_untracked(boxed(ctx, jvinfo));
}
assert(jl_is_datatype(jlto) && julia_struct_has_layout((jl_datatype_t*)jlto, jlto_env));
typeassert_input(ctx, jvinfo, jlto, jlto_env, argn, false);
if (!byRef)
return emit_unbox(ctx, to, jvinfo, jlto);
// pass the address of an alloca'd thing, not a box
// since those are immutable.
Value *slot = emit_static_alloca(ctx, to);
if (!jvinfo.ispointer()) {
ctx.builder.CreateStore(emit_unbox(ctx, to, jvinfo, jlto), slot);
}
else {
emit_memcpy(ctx, slot, jvinfo, jl_datatype_size(jlto), jl_datatype_align(jlto));
}
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 *gcroot;
} native_sym_arg_t;
// --- 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, const char *fname, 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, true);
if (ptr == NULL) {
jl_cgval_t arg1 = emit_expr(ctx, arg);
jl_value_t *ptr_ty = arg1.typ;
if (!jl_is_cpointer_type(ptr_ty)) {
const char *errmsg = !strcmp(fname, "ccall") ?
"ccall: first argument not a pointer or valid constant expression" :
"cglobal: first argument not a pointer or valid constant expression";
emit_cpointercheck(ctx, arg1, errmsg);
}
arg1 = update_julia_type(ctx, arg1, (jl_value_t*)jl_voidpointer_type);
jl_ptr = emit_unbox(ctx, T_size, 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
#ifdef _OS_WINDOWS_
if (!llvmcall)
f_lib = jl_dlfind_win32(f_name);
#endif
}
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);
else
JL_TYPECHKS(fname, symbol, 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
JL_TYPECHKS(fname, symbol, t1);
}
else {
JL_TYPECHKS(fname, pointer, ptr);
}
}
}
static jl_value_t* try_eval(jl_codectx_t &ctx, jl_value_t *ex, const char *failure)
{
jl_value_t *constant = static_eval(ctx, ex, true, true);
if (jl_is_ssavalue(ex) && !constant)
jl_error(failure);
else if (constant)
return constant;
JL_TRY {
size_t last_age = jl_get_ptls_states()->world_age;
jl_get_ptls_states()->world_age = ctx.world;
constant = jl_interpret_toplevel_expr_in(ctx.module, ex, ctx.source, ctx.linfo->sparam_vals);
jl_get_ptls_states()->world_age = last_age;
}
JL_CATCH {
jl_rethrow_with_add(failure);
}
return constant;
}
// --- code generator for cglobal ---
static jl_cgval_t emit_runtime_call(jl_codectx_t &ctx, JL_I::intrinsic f, const jl_cgval_t *argv, size_t nargs);
static jl_cgval_t emit_cglobal(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
{
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], true, true);
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 = julia_type_to_llvm(rt);
interpret_symbol_arg(ctx, sym, args[1], "cglobal", false);
if (sym.jl_ptr != NULL) {
res = ctx.builder.CreateBitCast(sym.jl_ptr, lrt);
}
else if (sym.fptr != NULL) {
res = ConstantInt::get(lrt, (uint64_t)sym.fptr);
if (imaging_mode)
jl_printf(JL_STDERR,"WARNING: literal address used in cglobal for %s; code cannot be statically compiled\n", sym.f_name);
}
else {
if (imaging_mode) {
res = runtime_sym_lookup(ctx, cast<PointerType>(T_pint8), sym.f_lib, sym.f_name, ctx.f);
res = ctx.builder.CreatePtrToInt(res, lrt);
}
else {
void *symaddr = jl_dlsym_e(jl_get_library(sym.f_lib), sym.f_name);
if (symaddr == NULL) {
std::stringstream msg;
msg << "cglobal: could not find symbol ";
msg << sym.f_name;
if (sym.f_lib != NULL) {
#ifdef _OS_WINDOWS_
assert(sym.f_lib != JL_EXE_LIBNAME && sym.f_lib != JL_DL_LIBNAME);
#endif
msg << " in library ";
msg << sym.f_lib;
}
emit_error(ctx, msg.str());
}
// since we aren't saving this code, there's no sense in
// putting anything complicated here: just JIT the address of the cglobal
res = ConstantInt::get(lrt, (uint64_t)symaddr);
}
}
JL_GC_POP();
return mark_julia_type(ctx, res, false, rt);
}
class FunctionMover final : public ValueMaterializer
{
public:
FunctionMover(llvm::Module *dest,llvm::Module *src) :
ValueMaterializer(), VMap(), destModule(dest), srcModule(src),
LazyFunctions(0)
{
}
ValueToValueMapTy VMap;
llvm::Module *destModule;
llvm::Module *srcModule;
std::vector<Function *> LazyFunctions;
Function *CloneFunctionProto(Function *F)
{
assert(!F->isDeclaration());
Function *NewF = Function::Create(F->getFunctionType(),
Function::ExternalLinkage,
F->getName(),
destModule);
LazyFunctions.push_back(F);
VMap[F] = NewF;
return NewF;
}
void CloneFunctionBody(Function *F)
{
Function *NewF = (Function*)(Value*)VMap[F];
assert(NewF != NULL);
Function::arg_iterator DestI = NewF->arg_begin();
for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) {
DestI->setName(I->getName()); // Copy the name over...
VMap[&*I] = &*(DestI++); // Add mapping to VMap
}
SmallVector<ReturnInst*, 8> Returns;
llvm::CloneFunctionInto(NewF,F,VMap,true,Returns,"",NULL,NULL,this);
NewF->setComdat(nullptr);
NewF->setSection("");
}
Function *CloneFunction(Function *F)
{
Function *NewF = (llvm::Function*)MapValue(F,VMap,RF_None,NULL,this);
ResolveLazyFunctions();
return NewF;
}
void ResolveLazyFunctions()
{
while (!LazyFunctions.empty()) {
Function *F = LazyFunctions.back();
LazyFunctions.pop_back();
CloneFunctionBody(F);
}
}
Value *InjectFunctionProto(Function *F)
{
Function *NewF = destModule->getFunction(F->getName());
if (!NewF) {
NewF = function_proto(F);
NewF->setComdat(nullptr);
destModule->getFunctionList().push_back(NewF);
}
return NewF;
}
Value *materialize(Value *V) override
{
Function *F = dyn_cast<Function>(V);
if (F) {
if (isIntrinsicFunction(F)) {
return destModule->getOrInsertFunction(F->getName(),F->getFunctionType());
}
if (F->isDeclaration() || F->getParent() != destModule) {
if (F->getName().empty())
return CloneFunctionProto(F);
Function *shadow = srcModule->getFunction(F->getName());
if (shadow != NULL && !shadow->isDeclaration()) {
Function *oldF = destModule->getFunction(F->getName());
if (oldF)
return oldF;
if (jl_ExecutionEngine->findSymbol(F->getName(), false))
return InjectFunctionProto(F);
return CloneFunctionProto(shadow);
}
else if (!F->isDeclaration()) {
return CloneFunctionProto(F);
}
}
// Still a declaration and still in a different module
if (F->isDeclaration() && F->getParent() != destModule) {
// Create forward declaration in current module
return InjectFunctionProto(F);
}
}
else if (isa<GlobalVariable>(V)) {
GlobalVariable *GV = cast<GlobalVariable>(V);
assert(GV != NULL);
GlobalVariable *oldGV = destModule->getGlobalVariable(GV->getName());
if (oldGV != NULL)
return oldGV;
GlobalVariable *newGV = new GlobalVariable(*destModule,
GV->getType()->getElementType(),
GV->isConstant(),
GlobalVariable::ExternalLinkage,
NULL,
GV->getName(),
NULL,
GV->getThreadLocalMode(),
GV->getType()->getPointerAddressSpace());
newGV->copyAttributesFrom(GV);
newGV->setComdat(nullptr);
if (GV->isDeclaration())
return newGV;
if (!GV->getName().empty()) {
uint64_t addr = jl_ExecutionEngine->getGlobalValueAddress(GV->getName());
if (addr != 0) {
newGV->setExternallyInitialized(true);
return newGV;
}
}
if (GV->hasInitializer()) {
Value *C = MapValue(GV->getInitializer(),VMap,RF_None,NULL,this);
newGV->setInitializer(cast<Constant>(C));
}
return newGV;
}
return NULL;
};
};
// llvmcall(ir, (rettypes...), (argtypes...), args...)
static jl_cgval_t emit_llvmcall(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
{
JL_NARGSV(llvmcall, 3);
jl_value_t *rt = NULL, *at = NULL, *ir = NULL, *decl = NULL;
JL_GC_PUSH4(&ir, &rt, &at, &decl);
at = try_eval(ctx, args[3], "error statically evaluating llvmcall argument tuple");
rt = try_eval(ctx, args[2], "error statically evaluating llvmcall return type");
ir = try_eval(ctx, args[1], "error statically evaluating llvm IR argument");
int i = 1;
if (jl_is_tuple(ir)) {
// if the IR is a tuple, we expect (declarations, ir)
if (jl_nfields(ir) != 2)
jl_error("Tuple as first argument to llvmcall must have exactly two children");
decl = jl_fieldref(ir,0);
ir = jl_fieldref(ir,1);
if (!jl_is_string(decl))
jl_error("Declarations passed to llvmcall must be a string");
}
bool isString = jl_is_string(ir);
bool isPtr = jl_is_cpointer(ir);
if (!isString && !isPtr) {
jl_error("IR passed to llvmcall must be a string or pointer to an LLVM Function");
}
JL_TYPECHK(llvmcall, type, rt);
JL_TYPECHK(llvmcall, type, at);
std::stringstream ir_stream;
// Generate arguments
std::string arguments;
llvm::raw_string_ostream argstream(arguments);
jl_svec_t *tt = ((jl_datatype_t*)at)->parameters;
jl_value_t *rtt = rt;
size_t nargt = jl_svec_len(tt);
/*
* 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.
*/
std::vector<llvm::Type*> argtypes;