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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 ---
#include "llvm/Support/Path.h" // for llvm::sys::path
#include <llvm/Bitcode/BitcodeReader.h>
#include <llvm/Linker/Linker.h>
// 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_codegen_params_t &emission_context, const char *f_lib, const char *f_name,
GlobalVariable *&lib, GlobalVariable *&sym)
{
Module *M = emission_context.shared_module(jl_LLVMContext);
bool runtime_lib = false;
GlobalVariable *libptrgv;
jl_codegen_params_t::SymMapGV *symMap;
#ifdef _OS_WINDOWS_
if ((intptr_t)f_lib == 1) {
libptrgv = prepare_global_in(M, jlexe_var);
symMap = &emission_context.symMapExe;
}
else if ((intptr_t)f_lib == 2) {
libptrgv = prepare_global_in(M, jldll_var);
symMap = &emission_context.symMapDl;
}
else
#endif
if (f_lib == NULL) {
libptrgv = jl_emit_RTLD_DEFAULT_var(M);
symMap = &emission_context.symMapDefault;
}
else {
std::string name = "ccalllib_";
name += llvm::sys::path::filename(f_lib);
name += std::to_string(globalUnique++);
runtime_lib = true;
auto &libgv = emission_context.libMapGV[f_lib];
if (libgv.first == NULL) {
libptrgv = new GlobalVariable(*M, T_pint8, false,
GlobalVariable::ExternalLinkage,
Constant::getNullValue(T_pint8), 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(globalUnique++);
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,
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(T_pvoidfunc, llvmgv, Align(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::Unordered);
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(emission_context, 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(emission_context, irbuilder, f_name), libptrgv });
StoreInst *store = irbuilder.CreateAlignedStore(llvmf, llvmgv, Align(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(ctx.emission_context, 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, funcptype, f_lib, 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_codegen_params_t &emission_context,
FunctionType *functype, const AttributeList &attrs,
CallingConv::ID cc, const char *f_lib, const char *f_name,
GlobalVariable *libptrgv, GlobalVariable *llvmgv,
bool runtime_lib)
{
Module *M = emission_context.shared_module(jl_LLVMContext);
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 << "_" << globalUnique++;
Function *plt = Function::Create(functype,
GlobalVariable::ExternalLinkage,
fname, M);
plt->setAttributes(attrs);
if (cc != CallingConv::C)
plt->setCallingConv(cc);
fname += "_got";
GlobalVariable *got = new GlobalVariable(*M, T_pvoidfunc, false,
GlobalVariable::ExternalLinkage,
ConstantExpr::getBitCast(plt, T_pvoidfunc),
fname);
BasicBlock *b0 = BasicBlock::Create(jl_LLVMContext, "top", plt);
IRBuilder<> irbuilder(b0);
Value *ptr = runtime_sym_lookup(emission_context, irbuilder, funcptype, f_lib, f_name, plt, libptrgv,
llvmgv, runtime_lib);
StoreInst *store = irbuilder.CreateAlignedStore(irbuilder.CreateBitCast(ptr, T_pvoidfunc), got, Align(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(
cast<FunctionType>(ptr->getType()->getPointerElementType()),
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 (attrs.hasAttribute(AttributeList::FunctionIndex,
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_))
// Ref https://bugs.llvm.org/show_bug.cgi?id=47058
// LLVM, as of 10.0.1 emits wrong/worse code when musttail is set
if (!attrs.hasAttrSomewhere(Attribute::ByVal))
ret->setTailCallKind(CallInst::TCK_MustTail);
#endif
if (functype->getReturnType() == T_void) {
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)
{
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;
bool runtime_lib = runtime_sym_gvs(ctx.emission_context, f_lib, f_name, libptrgv, llvmgv);
PointerType *funcptype = PointerType::get(functype, 0);
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.emission_context,
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, Align(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::Unordered);
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;
const DataLayout &DL = jl_data_layout;
unsigned align = std::max(DL.getPrefTypeAlignment(target_type), DL.getPrefTypeAlignment(from_type));
if (DL.getTypeAllocSize(target_type) >= DL.getTypeAllocSize(from_type)) {
to = emit_static_alloca(ctx, target_type);
cast<AllocaInst>(to)->setAlignment(Align(align));
from = emit_bitcast(ctx, to, from_type->getPointerTo());
}
else {
from = emit_static_alloca(ctx, from_type);
cast<AllocaInst>(from)->setAlignment(Align(align));
to = emit_bitcast(ctx, from, target_type->getPointerTo());
}
ctx.builder.CreateAlignedStore(v, from, Align(align));
return ctx.builder.CreateAlignedLoad(to, Align(align));
}
// --- argument passing and scratch space utilities ---
// Returns 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),
ctx.builder.CreateInBoundsGEP(
T_prjlvalue,
ctx.spvals_ptr,
ConstantInt::get(T_size, sizeof(jl_svec_t) / sizeof(jl_value_t*)))
};
auto call = ctx.builder.CreateCall(prepare_call(jlapplytype_func), makeArrayRef(args));
call->addAttribute(AttributeList::ReturnIndex,
Attribute::getWithAlignment(jl_LLVMContext, 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 " << 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)
{
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, ""));
}
}
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);
}
}
}
}
// 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)
{
// 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) && julia_struct_has_layout((jl_datatype_t*)jlto, jlto_env));
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.
Value *slot = emit_static_alloca(ctx, to);
if (!jvinfo.ispointer()) {
tbaa_decorate(jvinfo.tbaa, ctx.builder.CreateStore(emit_unbox(ctx, to, jvinfo, jlto), slot));
}
else {
emit_memcpy(ctx, slot, jvinfo.tbaa, jvinfo, jl_datatype_size(jlto), julia_alignment(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);
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);
}
}
}
// --- 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]);
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 = T_size;
assert(lrt == julia_type_to_llvm(ctx, 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;
void* libsym = jl_get_library_(sym.f_lib, 0);
if (!libsym || !jl_dlsym(libsym, sym.f_name, &symaddr, 0)) {
// Error mode, either the library or the symbol couldn't be find during compiletime.
// Fallback to a runtime symbol lookup.
res = runtime_sym_lookup(ctx, cast<PointerType>(T_pint8), sym.f_lib, sym.f_name, ctx.f);
res = ctx.builder.CreatePtrToInt(res, lrt);
} else {
// 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);
}
// --- code generator for llvmcall ---
static jl_cgval_t emit_llvmcall(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
{
// 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_arrayref((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");
return jl_cgval_t();
}
if (jl_is_ssavalue(args[2]) && !jl_is_long(ctx.source->ssavaluetypes)) {
jl_value_t *rtt = jl_arrayref((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");
return jl_cgval_t();
}
}
if (jl_is_ssavalue(args[3]) && !jl_is_long(ctx.source->ssavaluetypes)) {
jl_value_t *att = jl_arrayref((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");
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");
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");
return jl_cgval_t();
}
ir = jl_fieldref(ir, 0);
if (!jl_is_string(ir) && !jl_typeis(ir, jl_array_uint8_type)) {
emit_error(ctx, "Module IR passed to llvmcall must be a string or an array of bytes");
return jl_cgval_t();
}
}
else {
if (!jl_is_string(ir)) {
emit_error(ctx, "Function IR passed to llvmcall must be a string");
return jl_cgval_t();
}
}
JL_TYPECHK(llvmcall, type, rt);
JL_TYPECHK(llvmcall, type, at);
// Generate arguments
std::string arguments;
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;
Value **argvals = (Value**)alloca(nargt * sizeof(Value*));
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!");
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);
}
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" << globalUnique++;
if (jl_Module->getFunction(ir_name) == NULL)
break;
}
// generate a temporary module that contains our IR
std::unique_ptr<Module> Mod;
if (entry == NULL) {
// we only have function IR, which we should put in a function
bool first = true;
for (std::vector<Type *>::iterator it = argtypes.begin(); it != argtypes.end(); ++it) {
if (!first)
argstream << ",";
else
first = false;
(*it)->print(argstream);
argstream << " ";
}
std::string rstring;
raw_string_ostream rtypename(rstring);
rettype->print(rtypename);
std::map<uint64_t,std::string> localDecls;
std::string ir_string;
raw_string_ostream ir_stream(ir_string);
ir_stream << "; Number of arguments: " << nargt << "\n"
<< "define "<<rtypename.str()<<" @\"" << ir_name << "\"("<<argstream.str()<<") {\n"
<< jl_string_data(ir) << "\n}";
SMDiagnostic Err = SMDiagnostic();
Mod = parseAssemblyString(ir_stream.str(), Err, jl_LLVMContext);
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());
return jl_cgval_t();
}
Function *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();
Mod = parseAssemblyString(jl_string_data(ir), Err, jl_LLVMContext);
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());
return jl_cgval_t();
}
}
else {
auto Buf = MemoryBuffer::getMemBuffer(
StringRef((char *)jl_array_data(ir), jl_array_len(ir)), "llvmcall",
/*RequiresNullTerminator*/ false);
Expected<std::unique_ptr<Module>> ModuleOrErr =
parseBitcodeFile(*Buf, jl_LLVMContext);
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());
return jl_cgval_t();
}
Mod = std::move(ModuleOrErr.get());
}
Function *f = Mod->getFunction(jl_string_data(entry));
if (!f) {
emit_error(ctx, "Module IR does not contain specified entry function");
return jl_cgval_t();
}
f->setName(ir_name);
// verify the function type
assert(!f->isDeclaration());
assert(f->getReturnType() == rettype);
int i = 0;
for (std::vector<Type *>::iterator it = argtypes.begin();
it != argtypes.end(); ++it, ++i)
assert(*it == f->getFunctionType()->getParamType(i));
}
// copy module properties that should always match
Mod->setTargetTriple(jl_Module->getTargetTriple());
Mod->setDataLayout(jl_Module->getDataLayout());
// verify the definition
Function *def = Mod->getFunction(ir_name);
assert(def);
std::string message = "Malformed LLVM function: \n";
raw_string_ostream stream(message);
if (verifyFunction(*def, &stream)) {
emit_error(ctx, stream.str());
return jl_cgval_t();
}
def->setLinkage(GlobalVariable::LinkOnceODRLinkage);
// generate a call
FunctionType *decl_typ = FunctionType::get(rettype, argtypes, def->isVarArg());
Function *decl = Function::Create(decl_typ, def->getLinkage(), def->getAddressSpace(),
def->getName(), jl_Module);
decl->setAttributes(def->getAttributes());
CallInst *inst = ctx.builder.CreateCall(decl, ArrayRef<Value *>(&argvals[0], nargt));
// save the module to be linked later.
// we cannot do this right now, because linking mutates the destination module,
// which might invalidate LLVM values cached in cgval_t's (specifically constant arrays)
ctx.llvmcall_modules.push_back(std::move(Mod));
JL_GC_POP();
if (inst->getType() != rettype) {
std::string message;
raw_string_ostream stream(message);
stream << "llvmcall return type " << *inst->getType()
<< " does not match declared return type" << *rettype;
emit_error(ctx, stream.str());
return jl_cgval_t();
}
return mark_julia_type(ctx, inst, retboxed, rtt);
}
// --- code generator for ccall itself ---
// Returns T_prjlvalue
static Value *box_ccall_result(jl_codectx_t &ctx, Value *result, Value *runtime_dt, jl_value_t *rt)
{
// XXX: need to handle parameterized zero-byte types (singleton)
const DataLayout &DL = jl_data_layout;
unsigned nb = DL.getTypeStoreSize(result->getType());
MDNode *tbaa = jl_is_mutable(rt) ? tbaa_mutab : tbaa_immut;
Value *strct = emit_allocobj(ctx, nb, runtime_dt);
init_bits_value(ctx, strct, result, tbaa);
return strct;
}
static jl_cgval_t mark_or_box_ccall_result(jl_codectx_t &ctx, Value *result, bool isboxed, jl_value_t *rt, jl_unionall_t *unionall, bool static_rt)
{
if (!static_rt) {
assert(!isboxed && jl_is_datatype(rt) && ctx.spvals_ptr && unionall);
Value *runtime_dt = runtime_apply_type_env(ctx, rt);
// TODO: skip this check if rt is not a Tuple
emit_concretecheck(ctx, runtime_dt, "ccall: return type must be a concrete DataType");
Value *strct = box_ccall_result(ctx, result, runtime_dt, rt);
return mark_julia_type(ctx, strct, true, rt); // TODO: jl_rewrap_unionall(rt, unionall)
}
return mark_julia_type(ctx, result, isboxed, rt);
}
class function_sig_t {
public:
std::vector<Type*> fargt; // vector of llvm output types (julia_struct_to_llvm) for arguments
std::vector<Type*> fargt_sig; // vector of ABI coercion types for call signature
std::vector<bool> fargt_isboxed; // vector of whether the llvm output type is a Julia-box for each argument
std::vector<bool> byRefList; // vector of "byref" parameters
AttributeList attributes; // vector of function call site attributes
Type *lrt; // input parameter of the llvm return type (from julia_struct_to_llvm)
bool retboxed; // input parameter indicating whether lrt is jl_value_t*
Type *prt; // out parameter of the llvm return type for the function signature
int sret; // out parameter for indicating whether return value has been moved to the first argument position
std::string err_msg;
CallingConv::ID cc; // calling convention ABI
bool llvmcall;
jl_svec_t *at; // svec of julia argument types
jl_value_t *rt; // julia return type
jl_unionall_t *unionall_env; // UnionAll environment for `at` and `rt`
size_t nccallargs; // number of actual arguments
size_t nreqargs; // number of required arguments in ccall function definition
jl_codegen_params_t *ctx;
function_sig_t(const char *fname, Type *lrt, jl_value_t *rt, bool retboxed, jl_svec_t *at, jl_unionall_t *unionall_env, size_t nreqargs, CallingConv::ID cc, bool llvmcall, jl_codegen_params_t *ctx)
: lrt(lrt), retboxed(retboxed),
prt(NULL), sret(0), cc(cc), llvmcall(llvmcall),
at(at), rt(rt), unionall_env(unionall_env),
nccallargs(jl_svec_len(at)), nreqargs(nreqargs),
ctx(ctx)
{
err_msg = generate_func_sig(fname);
}
FunctionType *functype() const {
assert(err_msg.empty());
if (nreqargs > 0)
return FunctionType::get(sret ? T_void : prt, makeArrayRef(fargt_sig).slice(0, nreqargs), true);
else
return FunctionType::get(sret ? T_void : prt, fargt_sig, false);
}
jl_cgval_t emit_a_ccall(
jl_codectx_t &ctx,
const native_sym_arg_t &symarg,
jl_cgval_t *argv,
SmallVector<Value*, 16> &gc_uses,
bool static_rt) const;
private:
std::string generate_func_sig(const char *fname)
{
assert(rt && !jl_is_abstract_ref_type(rt));
std::vector<AttrBuilder> paramattrs;
std::unique_ptr<AbiLayout> abi;
if (llvmcall)
abi.reset(new ABI_LLVMLayout());
else
abi.reset(new DefaultAbiState());
sret = 0;
if (type_is_ghost(lrt)) {
prt = lrt = T_void;
abi->use_sret(jl_nothing_type);
}
else {
if (!jl_is_datatype(rt) || ((jl_datatype_t*)rt)->layout == NULL || jl_is_cpointer_type(rt) || jl_is_array_type(rt) || retboxed) {
prt = lrt; // passed as pointer
abi->use_sret(jl_voidpointer_type);
}
else if (abi->use_sret((jl_datatype_t*)rt)) {
AttrBuilder retattrs = AttrBuilder();
#if !defined(_OS_WINDOWS_) // llvm used to use the old mingw ABI, skipping this marking works around that difference
retattrs.addAttribute(Attribute::StructRet);
#endif
retattrs.addAttribute(Attribute::NoAlias);
paramattrs.push_back(std::move(retattrs));
fargt_sig.push_back(PointerType::get(lrt, 0));
sret = 1;
prt = lrt;
}
else {
prt = abi->preferred_llvm_type((jl_datatype_t*)rt, true);
if (prt == NULL)
prt = lrt;
}
}
for (size_t i = 0; i < nccallargs; ++i) {
AttrBuilder ab;
jl_value_t *tti = jl_svecref(at, i);
Type *t = NULL;
bool isboxed;
if (jl_is_abstract_ref_type(tti)) {
tti = (jl_value_t*)jl_voidpointer_type;
t = T_pint8;
isboxed = false;
}
else if (llvmcall && jl_is_llvmpointer_type(tti)) {
t = bitstype_to_llvm(tti, true);
tti = (jl_value_t*)jl_voidpointer_type;
isboxed = false;
}
else {
if (jl_is_primitivetype(tti)) {
// see pull req #978. need to annotate signext/zeroext for
// small integer arguments.
jl_datatype_t *bt = (jl_datatype_t*)tti;
if (jl_datatype_size(bt) < 4) {
if (jl_signed_type && jl_subtype(tti, (jl_value_t*)jl_signed_type))
ab.addAttribute(Attribute::SExt);
else
ab.addAttribute(Attribute::ZExt);
}
}