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ccall.cpp
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// This file is a part of Julia. License is MIT: http://julialang.org/license
#include "support/hashing.h"
// --- 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_global(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(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 = builder.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 = builder.CreateAlignedLoad(llvmgv, sizeof(void*));
// This in principle needs a consume ordering so that load from
// this pointer sees 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 a
// invalid load from the `cglobal` but doesn't depend on the `cglobal`
// value for this to happen.
// llvmf_orig->setAtomic(AtomicOrdering::Consume);
builder.CreateCondBr(builder.CreateICmpNE(llvmf_orig, initnul),
ccall_bb, dlsym_lookup);
assert(f->getParent() != NULL);
f->getBasicBlockList().push_back(dlsym_lookup);
builder.SetInsertPoint(dlsym_lookup);
Value *libname;
if (runtime_lib) {
libname = stringConstPtr(f_lib);
}
else {
libname = literal_static_pointer_val(f_lib, T_pint8);
}
#ifdef LLVM37
Value *llvmf = builder.CreateCall(prepare_call(jldlsym_func), { libname, stringConstPtr(f_name), libptrgv });
#else
Value *llvmf = builder.CreateCall3(prepare_call(jldlsym_func), libname, stringConstPtr(f_name), libptrgv);
#endif
auto store = builder.CreateAlignedStore(llvmf, llvmgv, sizeof(void*));
# ifdef LLVM39
store->setAtomic(AtomicOrdering::Release);
# else
store->setAtomic(Release);
# endif
builder.CreateBr(ccall_bb);
f->getBasicBlockList().push_back(ccall_bb);
builder.SetInsertPoint(ccall_bb);
PHINode *p = builder.CreatePHI(T_pvoidfunc, 2);
p->addIncoming(llvmf_orig, enter_bb);
p->addIncoming(llvmf, dlsym_lookup);
return builder.CreatePointerCast(p, funcptype);
}
static Value *runtime_sym_lookup(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(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.
static DenseMap<AttributeSet,
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 Value *emit_plt(FunctionType *functype, const AttributeSet &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;
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);
auto &slot = pltMap[key];
GlobalVariable *got;
if (!slot) {
Module *M = LM.get();
libptrgv = prepare_global(libptrgv, M);
llvmgv = prepare_global(llvmgv, M);
BasicBlock *old = builder.GetInsertBlock();
DebugLoc olddl = builder.getCurrentDebugLocation();
DebugLoc noDbg;
builder.SetCurrentDebugLocation(noDbg);
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();
got = new GlobalVariable(*M, T_pvoidfunc, false,
GlobalVariable::ExternalLinkage,
nullptr, gname);
slot = global_proto(got);
*(void**)jl_emit_and_add_to_shadow(got) = symaddr;
BasicBlock *b0 = BasicBlock::Create(jl_LLVMContext, "top", plt);
builder.SetInsertPoint(b0);
Value *ptr = runtime_sym_lookup(funcptype, f_lib, f_name, plt, libptrgv,
llvmgv, runtime_lib);
auto store = builder.CreateAlignedStore(builder.CreateBitCast(ptr, T_pvoidfunc), got, sizeof(void*));
# ifdef LLVM39
store->setAtomic(AtomicOrdering::Release);
# else
store->setAtomic(Release);
# endif
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 = builder.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 (attrs.hasAttribute(AttributeSet::FunctionIndex,
Attribute::NoReturn)) {
builder.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(LLVM37) && (defined(_CPU_X86_) || defined(_CPU_X86_64_) || \
defined(_CPU_AARCH64_))
ret->setTailCallKind(CallInst::TCK_MustTail);
#endif
if (functype->getReturnType() == T_void) {
builder.CreateRetVoid();
}
else {
builder.CreateRet(ret);
}
}
builder.SetInsertPoint(old);
builder.SetCurrentDebugLocation(olddl);
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));
got = prepare_global(shadowgot);
}
else {
// `runtime_sym_gvs` shouldn't have created anything in a new module
// if it returns a GV that already exists.
assert(!LM.m);
got = prepare_global(slot);
}
LoadInst *got_val = 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 issue though
// since the only thing we do to this loaded pointer is to call it
// immediately.
// got_val->setAtomic(AtomicOrdering::Consume);
return builder.CreateBitCast(got_val, funcptype);
}
// --- ABI Implementations ---
// Partially based on the LDC ABI implementations licensed under the BSD 3-clause license
#if defined ABI_LLVM
# include "abi_llvm.cpp"
#elif defined _CPU_X86_64_
# if defined _OS_WINDOWS_
# include "abi_win64.cpp"
# else
# include "abi_x86_64.cpp"
# endif
#elif defined _CPU_X86_
# if defined _OS_WINDOWS_
# include "abi_win32.cpp"
# else
# include "abi_x86.cpp"
# endif
#elif defined _CPU_ARM_
# include "abi_arm.cpp"
#elif defined _CPU_AARCH64_
# include "abi_aarch64.cpp"
#elif defined _CPU_PPC64_
# include "abi_ppc64le.cpp"
#else
# warning "ccall is defaulting to llvm ABI, since no platform ABI has been defined for this CPU/OS combination"
# include "abi_llvm.cpp"
#endif
Value *llvm_type_rewrite(Value *v, Type *from_type, Type *target_type,
bool tojulia, /* only matters if byref is set (declares the direction of the byref attribute) */
bool byref, /* only applies to arguments, set false for return values -- effectively the same as jl_cgval_t.ispointer() */
bool issigned, /* determines whether an integer value should be zero or sign extended */
jl_codectx_t *ctx)
{
if (v->getType() == T_void)
return UndefValue::get(target_type); // convert undef (unreachable) -> undef (target_type)
if (byref) {
if (tojulia) {
Type *ptarget_type = PointerType::get(target_type, 0);
if (v->getType() != ptarget_type)
v = builder.CreatePointerCast(v, ptarget_type);
return builder.CreateAlignedLoad(v, 1); // unknown alignment from C
}
else {
// julia_to_native should already have done the alloca and store
if (v->getType() != target_type)
v = builder.CreatePointerCast(v, target_type);
return v;
}
}
assert(v->getType() == from_type);
if (target_type == from_type) {
return v;
}
assert(from_type->isPointerTy() == target_type->isPointerTy()); // expect that all ABIs consider all pointers to be equivalent
if (target_type->isPointerTy()) {
return builder.CreatePointerCast(v, target_type);
}
// simple integer and float widening & conversion cases
if (from_type->getPrimitiveSizeInBits() > 0 && target_type->getPrimitiveSizeInBits() == from_type->getPrimitiveSizeInBits()) {
return emit_bitcast(v, target_type);
}
if (target_type->isFloatingPointTy() && from_type->isFloatingPointTy()) {
if (target_type->getPrimitiveSizeInBits() > from_type->getPrimitiveSizeInBits())
return builder.CreateFPExt(v, target_type);
else if (target_type->getPrimitiveSizeInBits() < from_type->getPrimitiveSizeInBits())
return builder.CreateFPTrunc(v, target_type);
else
return v;
}
if (target_type->isIntegerTy() && from_type->isIntegerTy()) {
if (issigned)
return builder.CreateSExtOrTrunc(v, target_type);
else
return 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
// NOTE: it is assumed that the ABI has ensured that sizeof(from_type) == sizeof(target_type)
Value *mem = emit_static_alloca(target_type, ctx);
builder.CreateStore(v, builder.CreatePointerCast(mem, from_type->getPointerTo()));
return builder.CreateLoad(mem);
}
// --- argument passing and scratch space utilities ---
// 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(Type *to, bool toboxed, jl_value_t *jlto, const jl_cgval_t &jvinfo,
bool addressOf, bool byRef, bool inReg, bool needCopy,
bool tojulia, int argn, jl_codectx_t *ctx,
bool *needStackRestore)
{
// We're passing Any
if (toboxed) {
assert(!addressOf && !byRef); // don't expect any ABI to pass pointers by pointer
return boxed(jvinfo, ctx);
}
assert(jl_is_leaf_type(jlto));
// TODO: Tuple arguments are currently undefined behavior, for defining the calling convention that they match to.
// XXX: However, they are used in the llvmcall test, so I guess it'll have to stay.
//if (jl_is_tuple(jlto) || jl_is_tuple_type(jlto)) {
// emit_error("ccall: unimplemented: unboxed tuple argument type", ctx);
// return UndefValue::get(to);
//}
jl_value_t *ety = jlto;
if (addressOf) {
if (!jl_is_cpointer_type(jlto)) {
emit_error("ccall: & on argument was not matched by Ptr{T} argument type", ctx);
return UndefValue::get(T_void);
}
ety = jl_tparam0(jlto);
if (jlto == (jl_value_t*)jl_voidpointer_type)
ety = jvinfo.typ; // skip the type-check
assert(to->isPointerTy());
}
if (jvinfo.typ != ety && ety != (jl_value_t*)jl_any_type) {
if (!addressOf && ety == (jl_value_t*)jl_voidpointer_type) {
// allow a bit more flexibility for what can be passed to (void*) due to Ref{T} conversion behavior below
if (!jl_is_cpointer_type(jvinfo.typ)) {
// emit a typecheck, if not statically known to be correct
std::stringstream msg;
msg << "ccall argument ";
msg << argn;
emit_cpointercheck(jvinfo, msg.str(), ctx);
}
}
else {
// emit a typecheck, if not statically known to be correct
std::stringstream msg;
msg << "ccall argument ";
msg << argn;
emit_typecheck(jvinfo, ety, msg.str(), ctx);
}
}
if (!addressOf && !byRef)
return emit_unbox(to, jvinfo, ety);
if (addressOf && jvinfo.isboxed) {
if (!jl_is_abstracttype(ety)) {
if (jl_is_mutable_datatype(ety)) {
// no copy, just reference the data field
return data_pointer(jvinfo, ctx, to);
}
else if (jl_is_immutable_datatype(ety) && jlto != (jl_value_t*)jl_voidpointer_type) {
// yes copy
Value *nbytes;
AllocaInst *ai;
if (jl_is_leaf_type(ety)) {
int nb = jl_datatype_size(ety);
nbytes = ConstantInt::get(T_int32, nb);
ai = emit_static_alloca(T_int8, nb, ctx);
}
else {
nbytes = emit_datatype_size(emit_typeof_boxed(jvinfo,ctx));
ai = builder.CreateAlloca(T_int8, nbytes);
*needStackRestore = true;
}
ai->setAlignment(16);
prepare_call(
builder.CreateMemCpy(ai, data_pointer(jvinfo, ctx, T_pint8), nbytes, sizeof(void*))->getCalledValue()); // minimum gc-alignment in julia is pointer size
return emit_bitcast(ai, to);
}
}
// emit maybe copy
*needStackRestore = true;
Value *jvt = emit_typeof_boxed(jvinfo, ctx);
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(jvt);
builder.CreateCondBr(ismutable, mutableBB, immutableBB);
builder.SetInsertPoint(mutableBB);
Value *p1 = data_pointer(jvinfo, ctx, to);
builder.CreateBr(afterBB);
builder.SetInsertPoint(immutableBB);
Value *nbytes = emit_datatype_size(jvt);
AllocaInst *ai = builder.CreateAlloca(T_int8, nbytes);
ai->setAlignment(16);
prepare_call(builder.CreateMemCpy(ai, data_pointer(jvinfo, ctx, T_pint8), nbytes, sizeof(void*))->getCalledValue()); // minimum gc-alignment in julia is pointer size
Value *p2 = emit_bitcast(ai, to);
builder.CreateBr(afterBB);
builder.SetInsertPoint(afterBB);
PHINode *p = builder.CreatePHI(to, 2);
p->addIncoming(p1, mutableBB);
p->addIncoming(p2, immutableBB);
return p;
}
// pass the address of an alloca'd thing, not a box
// since those are immutable.
if (addressOf)
to = to->getContainedType(0);
Value *slot = emit_static_alloca(to, ctx);
if (!jvinfo.ispointer()) {
builder.CreateStore(emit_unbox(to, jvinfo, ety), slot);
}
else {
prepare_call(builder.CreateMemCpy(slot, data_pointer(jvinfo, ctx, slot->getType()),
(uint64_t)jl_datatype_size(ety),
(uint64_t)((jl_datatype_t*)ety)->layout->alignment)->getCalledValue());
mark_gc_use(jvinfo);
}
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
} native_sym_arg_t;
// --- parse :sym or (:sym, :lib) argument into address info ---
static native_sym_arg_t interpret_symbol_arg(jl_value_t *arg, jl_codectx_t *ctx, const char *fname)
{
jl_value_t *ptr = NULL;
Value *jl_ptr=NULL;
ptr = static_eval(arg, ctx, true);
if (ptr == NULL) {
jl_value_t *ptr_ty = expr_type(arg, ctx);
jl_cgval_t arg1 = emit_expr(arg, ctx);
if (!jl_is_cpointer_type(ptr_ty)) {
emit_cpointercheck(arg1,
!strcmp(fname,"ccall") ?
"ccall: first argument not a pointer or valid constant expression" :
"cglobal: first argument not a pointer or valid constant expression",
ctx);
}
arg1 = remark_julia_type(arg1, (jl_value_t*)jl_voidpointer_type);
jl_ptr = emit_unbox(T_size, arg1, (jl_value_t*)jl_voidpointer_type);
}
void (*fptr)(void) = NULL;
const char *f_name=NULL, *f_lib=NULL;
jl_value_t *t0 = NULL, *t1 = NULL;
JL_GC_PUSH3(&ptr, &t0, &t1);
if (ptr != NULL) {
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_
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);
jl_value_t *t1 = jl_fieldref(ptr,1);
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);
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);
}
}
JL_GC_POP();
native_sym_arg_t r;
r.jl_ptr = jl_ptr;
r.fptr = fptr;
r.f_name = f_name;
r.f_lib = f_lib;
return r;
}
static jl_value_t* try_eval(jl_value_t *ex, jl_codectx_t *ctx, const char *failure, bool compiletime=false)
{
jl_value_t *constant = NULL;
constant = static_eval(ex, ctx, true, true);
if (constant || jl_is_ssavalue(ex))
return constant;
JL_TRY {
constant = jl_interpret_toplevel_expr_in(ctx->module, ex, ctx->source, ctx->linfo->sparam_vals);
}
JL_CATCH {
if (compiletime)
jl_rethrow_with_add(failure);
if (failure)
emit_error(failure, ctx);
constant = NULL;
}
return constant;
}
// --- code generator for cglobal ---
static jl_cgval_t emit_cglobal(jl_value_t **args, size_t nargs, jl_codectx_t *ctx)
{
JL_NARGS(cglobal, 1, 2);
jl_value_t *rt=NULL;
Value *res;
JL_GC_PUSH1(&rt);
if (nargs == 2) {
rt = try_eval(args[2], ctx, "error interpreting cglobal pointer type");
if (rt == NULL) {
JL_GC_POP();
return jl_cgval_t();
}
JL_TYPECHK(cglobal, type, rt);
rt = (jl_value_t*)jl_apply_type((jl_value_t*)jl_pointer_type, jl_svec1(rt));
}
else {
rt = (jl_value_t*)jl_voidpointer_type;
}
Type *lrt = julia_type_to_llvm(rt);
if (lrt == NULL) lrt = T_pint8;
native_sym_arg_t sym = interpret_symbol_arg(args[1], ctx, "cglobal");
if (sym.jl_ptr != NULL) {
res = builder.CreateIntToPtr(sym.jl_ptr, lrt);
}
else if (sym.fptr != NULL) {
res = literal_static_pointer_val((void*)(uintptr_t)sym.fptr, lrt);
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((PointerType*)lrt, sym.f_lib, sym.f_name, ctx->f);
}
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((intptr_t)sym.f_lib != 1 && (intptr_t)sym.f_lib != 2);
#endif
msg << " in library ";
msg << sym.f_lib;
}
emit_error(msg.str(), ctx);
}
// since we aren't saving this code, there's no sense in
// putting anything complicated here: just JIT the address of the cglobal
res = literal_static_pointer_val(symaddr, lrt);
}
}
JL_GC_POP();
return mark_julia_type(res, false, rt, ctx);
}
#ifdef USE_MCJIT
class FunctionMover : 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
}
#ifdef LLVM36
// Clone debug info - Not yet public API
// llvm::CloneDebugInfoMetadata(NewF,F,VMap);
#endif
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;
}
#if defined(LLVM39)
virtual Value *materialize(Value *V) override
#elif defined(LLVM38)
virtual Value *materializeDeclFor(Value *V) override
#else
virtual Value *materializeValueFor (Value *V) override
#endif
{
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;
#ifdef USE_ORCJIT
if (jl_ExecutionEngine->findSymbol(F->getName(), false))
return InjectFunctionProto(F);
#endif
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;
};
};
#endif
// llvmcall(ir, (rettypes...), (argtypes...), args...)
static jl_cgval_t emit_llvmcall(jl_value_t **args, size_t nargs, jl_codectx_t *ctx)
{
JL_NARGSV(llvmcall, 3);
jl_value_t *rt = NULL, *at = NULL, *ir = NULL, *decl = NULL;
jl_svec_t *stt = NULL;
JL_GC_PUSH5(&ir, &rt, &at, &stt, &decl);
at = try_eval(args[3], ctx, "error statically evaluating llvmcall argument tuple", true);
rt = try_eval(args[2], ctx, "error statically evaluating llvmcall return type", true);
ir = try_eval(args[1], ctx, "error statically evaluating llvm IR argument", true);
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;
stt = jl_alloc_svec(nargs - 3);
for (size_t i = 0; i < nargs-3; ++i) {
jl_svecset(stt,i,expr_type(args[4+i],ctx));
}
// 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);
Value **argvals = (Value**) alloca(nargt*sizeof(Value*));
std::vector<llvm::Type*> argtypes;
/*
* 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_cgval_t *argv = (jl_cgval_t*)alloca(sizeof(jl_cgval_t) * 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(tti, &toboxed);
argtypes.push_back(t);
if (4+i > nargs) {
jl_error("Missing arguments to llvmcall!");
}
jl_value_t *argi = args[4 + i];
jl_cgval_t &arg = argv[i];
arg = emit_expr(argi, ctx);
Value *v = julia_to_native(t, toboxed, tti, arg, false, false, false, false, false, i, ctx, NULL);
// make sure args are rooted
bool issigned = jl_signed_type && jl_subtype(tti, (jl_value_t*)jl_signed_type, 0);
argvals[i] = llvm_type_rewrite(v, t, t, false, false, issigned, ctx);
}
Function *f;
bool retboxed;
Type *rettype = julia_type_to_llvm(rtt, &retboxed);
if (isString) {
// Make sure to find a unique name
std::string ir_name;
while(true) {
std::stringstream name;
name << (ctx->f->getName().str()) << "u" << i++;
ir_name = name.str();
if (jl_Module->getFunction(ir_name) == NULL)
break;
}
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;
llvm::raw_string_ostream rtypename(rstring);
rettype->print(rtypename);
std::map<uint64_t,std::string> localDecls;
if (decl != NULL) {
std::stringstream declarations(jl_string_data(decl));
// parse string line by line
std::string declstr;
while (std::getline(declarations, declstr, '\n')) {
// Find name of declaration by searching for '@'
std::string::size_type atpos = declstr.find('@') + 1;
// Find end of declaration by searching for '('
std::string::size_type bracepos = declstr.find('(', atpos);
// Declaration name is the string between @ and (
std::string declname = declstr.substr(atpos, bracepos - atpos);
// Check if declaration already present in module
if(jl_Module->getNamedValue(declname) == NULL) {
ir_stream << "; Declarations\n" << declstr << "\n";
}
}
}
ir_stream << "; Number of arguments: " << nargt << "\n"
<< "define "<<rtypename.str()<<" @\"" << ir_name << "\"("<<argstream.str()<<") {\n"
<< jl_string_data(ir) << "\n}";
SMDiagnostic Err = SMDiagnostic();
std::string ir_string = ir_stream.str();
#ifdef LLVM36
Module *m = NULL;
bool failed = parseAssemblyInto(llvm::MemoryBufferRef(ir_string,"llvmcall"),*jl_Module,Err);
if (!failed)
m = jl_Module;
#else
Module *m = ParseAssemblyString(ir_string.c_str(),jl_Module,Err,jl_LLVMContext);
#endif
if (m == NULL) {
std::string message = "Failed to parse LLVM Assembly: \n";
llvm::raw_string_ostream stream(message);
Err.print("julia",stream,true);
jl_error(stream.str().c_str());
}
f = m->getFunction(ir_name);
}
else {
assert(isPtr);