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codegen.cpp
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// This file is a part of Julia. License is MIT: https://julialang.org/license
#include "llvm-version.h"
#include "platform.h"
#include "options.h"
#if defined(_OS_WINDOWS_) && JL_LLVM_VERSION < 40000
// trick pre-llvm39 into skipping the generation of _chkstk calls
// since it has some codegen issues associated with them:
// (a) assumed to be within 32-bit offset
// (b) bad asm is generated for certain code patterns:
// see https://github.com/JuliaLang/julia/pull/11644#issuecomment-112276813
// also, use ELF because RuntimeDyld COFF I686 support didn't exist
// also, use ELF because RuntimeDyld COFF X86_64 doesn't seem to work (fails to generate function pointers)?
#define FORCE_ELF
#endif
#if defined(_CPU_X86_)
#define JL_NEED_FLOATTEMP_VAR 1
#endif
#ifndef __STDC_LIMIT_MACROS
#define __STDC_LIMIT_MACROS
#define __STDC_CONSTANT_MACROS
#endif
#include <setjmp.h>
#include <string>
#include <sstream>
#include <fstream>
#include <map>
#include <array>
#include <vector>
#include <set>
#include <cstdio>
#include <cassert>
#include <iostream>
#include <functional>
// target machine computation
#include <llvm/Target/TargetSubtargetInfo.h>
#include <llvm/Support/TargetRegistry.h>
#include <llvm/Target/TargetOptions.h>
#include <llvm/Support/Host.h>
#include <llvm/Support/TargetSelect.h>
#include <llvm/Analysis/TargetLibraryInfo.h>
#include <llvm/Object/SymbolSize.h>
// IR building
#include <llvm/IR/IntrinsicInst.h>
#include <llvm/Object/ObjectFile.h>
#include <llvm/IR/DIBuilder.h>
#include <llvm/AsmParser/Parser.h>
#include <llvm/DebugInfo/DIContext.h>
#include <llvm/IR/DerivedTypes.h>
#include <llvm/IR/Intrinsics.h>
#include <llvm/IR/Attributes.h>
#include <llvm/IR/IRBuilder.h>
#include <llvm/IR/MDBuilder.h>
// support
#include <llvm/ADT/SmallBitVector.h>
#include <llvm/ADT/Optional.h>
#include <llvm/Support/raw_ostream.h>
#include <llvm/Support/FormattedStream.h>
#include <llvm/Support/SourceMgr.h> // for llvmcall
#include <llvm/Transforms/Utils/Cloning.h> // for llvmcall inlining
#include <llvm/IR/Verifier.h> // for llvmcall validation
#if JL_LLVM_VERSION >= 40000
# include <llvm/Bitcode/BitcodeWriter.h>
#else
# include <llvm/Bitcode/ReaderWriter.h>
#endif
// C API
#include <llvm-c/Types.h>
// for configuration options
#include <llvm/Support/PrettyStackTrace.h>
#include <llvm/Support/CommandLine.h>
#include <llvm/IR/InlineAsm.h>
#if defined(_CPU_ARM_) || defined(_CPU_AARCH64_)
# include <sys/utsname.h>
#endif
#if defined(USE_POLLY)
#include <polly/RegisterPasses.h>
#include <polly/ScopDetection.h>
#endif
#include "fix_llvm_assert.h"
using namespace llvm;
namespace llvm {
extern bool annotateSimdLoop(BasicBlock *latch);
}
#if defined(_OS_WINDOWS_) && !defined(NOMINMAX)
#define NOMINMAX
#endif
#include "julia.h"
#include "julia_internal.h"
#include "jitlayers.h"
#include "codegen_internal.h"
// LLVM version compatibility macros
legacy::PassManager *jl_globalPM;
#if JL_LLVM_VERSION >= 40000
#define DIFlagZero (DINode::FlagZero)
#else
#define DIFlagZero (0)
#endif
extern "C" {
#include "builtin_proto.h"
#ifdef HAVE_SSP
extern uintptr_t __stack_chk_guard;
extern void __stack_chk_fail();
#else
JL_DLLEXPORT uintptr_t __stack_chk_guard = (uintptr_t)0xBAD57ACCBAD67ACC; // 0xBADSTACKBADSTACK
JL_DLLEXPORT void __stack_chk_fail()
{
/* put your panic function or similar in here */
fprintf(stderr, "fatal error: stack corruption detected\n");
gc_debug_critical_error();
abort(); // end with abort, since the compiler destroyed the stack upon entry to this function, there's no going back now
}
#endif
#ifdef _OS_WINDOWS_
#if defined(_CPU_X86_64_)
#if defined(_COMPILER_MINGW_)
extern void ___chkstk_ms(void);
#else
extern void __chkstk(void);
#endif
#else
#if defined(_COMPILER_MINGW_)
#undef _alloca
extern void _alloca(void);
#else
extern void _chkstk(void);
#endif
#endif
//void *force_chkstk(void) {
// return alloca(40960);
//}
#endif
}
#if defined(_COMPILER_MICROSOFT_) && !defined(__alignof__)
#define __alignof__ __alignof
#endif
#define DISABLE_FLOAT16
// llvm state
JL_DLLEXPORT LLVMContext jl_LLVMContext;
static bool nested_compile = false;
TargetMachine *jl_TargetMachine;
extern JITEventListener *CreateJuliaJITEventListener();
// for image reloading
bool imaging_mode = false;
Module *shadow_output;
#define jl_Module ctx.f->getParent()
#define jl_builderModule(builder) (builder).GetInsertBlock()->getParent()->getParent()
static DataLayout jl_data_layout("");
// types
static Type *T_jlvalue;
static Type *T_pjlvalue;
static Type *T_prjlvalue;
static Type *T_ppjlvalue;
static Type *T_pprjlvalue;
static Type *jl_array_llvmt;
static Type *jl_parray_llvmt;
static FunctionType *jl_func_sig;
static FunctionType *jl_func_sig_sparams;
static Type *T_pvoidfunc;
static IntegerType *T_int1;
static IntegerType *T_int8;
static IntegerType *T_int16;
static IntegerType *T_int32;
static IntegerType *T_int64;
static IntegerType *T_uint8;
static IntegerType *T_uint16;
static IntegerType *T_uint32;
static IntegerType *T_uint64;
static IntegerType *T_char;
static IntegerType *T_size;
static IntegerType *T_sigatomic;
static Type *T_float16;
static Type *T_float32;
static Type *T_float64;
static Type *T_float128;
static Type *T_pint8;
static Type *T_pint16;
static Type *T_pint32;
static Type *T_pint64;
static Type *T_psize;
static Type *T_pfloat32;
static Type *T_pfloat64;
static Type *T_ppint8;
static Type *T_pppint8;
static Type *T_void;
// type-based alias analysis nodes. Indentation of comments indicates hierarchy.
static MDNode *tbaa_gcframe; // GC frame
// LLVM should have enough info for alias analysis of non-gcframe stack slot
// this is mainly a place holder for `jl_cgval_t::tbaa`
static MDNode *tbaa_stack; // stack slot
static MDNode *tbaa_data; // Any user data that `pointerset/ref` are allowed to alias
static MDNode *tbaa_tag; // Type tag
static MDNode *tbaa_binding; // jl_binding_t::value
static MDNode *tbaa_value; // jl_value_t, that is not jl_array_t
static MDNode *tbaa_mutab; // mutable type
static MDNode *tbaa_immut; // immutable type
static MDNode *tbaa_ptrarraybuf; // Data in an array of boxed values
static MDNode *tbaa_arraybuf; // Data in an array of POD
static MDNode *tbaa_array; // jl_array_t
static MDNode *tbaa_arrayptr; // The pointer inside a jl_array_t
static MDNode *tbaa_arraysize; // A size in a jl_array_t
static MDNode *tbaa_arraylen; // The len in a jl_array_t
static MDNode *tbaa_arrayflags; // The flags in a jl_array_t
static MDNode *tbaa_const; // Memory that is immutable by the time LLVM can see it
// Basic DITypes
static DICompositeType *jl_value_dillvmt;
static DIDerivedType *jl_pvalue_dillvmt;
static DIDerivedType *jl_ppvalue_dillvmt;
static DISubroutineType *jl_di_func_sig;
static DISubroutineType *jl_di_func_null_sig;
extern "C"
int32_t jl_jlcall_api(const void *function)
{
// give the function an index in the constant lookup table
if (function == NULL)
return 0;
const Function *F = cast<const Function>((const Value*)function);
StringRef Name = F->getName();
if (Name.startswith("japi3_")) // jlcall abi 3 from JIT
return 3;
assert(Name.startswith("japi1_") || // jlcall abi 1 from JIT
Name.startswith("jsys1_") || // jlcall abi 1 from sysimg
Name.startswith("jlcall_") || // jlcall abi 1 from JIT wrapping a specsig method
Name.startswith("jlsysw_")); // jlcall abi 1 from sysimg wrapping a specsig method
return 1;
}
// constants
static Constant *V_null;
static Type *NoopType;
extern "C" {
JL_DLLEXPORT Type *julia_type_to_llvm(jl_value_t *jt, bool *isboxed=NULL);
}
static bool type_is_ghost(Type *ty)
{
return (ty == T_void || ty->isEmptyTy());
}
// global vars
static GlobalVariable *jlRTLD_DEFAULT_var;
#ifdef _OS_WINDOWS_
static GlobalVariable *jlexe_var;
static GlobalVariable *jldll_var;
#endif //_OS_WINDOWS_
static Function *jltls_states_func;
#ifndef JULIA_ENABLE_THREADING
static GlobalVariable *jltls_states_var;
#else
// Imaging mode only
size_t jltls_states_func_idx = 0;
size_t jltls_offset_idx = 0;
#endif
// important functions
static Function *jlnew_func;
static Function *jlthrow_func;
static Function *jlerror_func;
static Function *jltypeerror_func;
static Function *jlundefvarerror_func;
static Function *jlboundserror_func;
static Function *jluboundserror_func;
static Function *jlvboundserror_func;
static Function *jlboundserrorv_func;
static Function *jlcheckassign_func;
static Function *jldeclareconst_func;
static Function *jlgetbindingorerror_func;
static Function *jlboundp_func;
static Function *jltopeval_func;
static Function *jlcopyast_func;
static Function *jltuple_func;
static Function *jlnsvec_func;
static Function *jlapplygeneric_func;
static Function *jlinvoke_func;
static Function *jlapply2va_func;
static Function *jlgetfield_func;
static Function *jlmethod_func;
static Function *jlgenericfunction_func;
static Function *jlenter_func;
static Function *jlleave_func;
static Function *jlegal_func;
static Function *jlalloc_pool_func;
static Function *jlalloc_big_func;
static Function *jlisa_func;
static Function *jlsubtype_func;
static Function *jlapplytype_func;
static Function *setjmp_func;
static Function *memcmp_func;
static Function *box_int8_func;
static Function *box_uint8_func;
static Function *box_int16_func;
static Function *box_uint16_func;
static Function *box_int32_func;
static Function *box_char_func;
static Function *box_uint32_func;
static Function *box_int64_func;
static Function *box_uint64_func;
static Function *box_float32_func;
static Function *box_float64_func;
static Function *box_ssavalue_func;
static Function *box8_func;
static Function *box16_func;
static Function *box32_func;
static Function *box64_func;
static Function *queuerootfun;
static Function *expect_func;
static Function *jldlsym_func;
static Function *jlnewbits_func;
static Function *jltypeassert_func;
static Function *jldepwarnpi_func;
//static Function *jlgetnthfield_func;
static Function *jlgetnthfieldchecked_func;
//static Function *jlsetnthfield_func;
#ifdef _OS_WINDOWS_
static Function *resetstkoflw_func;
#if defined(_CPU_X86_64_)
Function *juliapersonality_func;
#endif
#endif
static Function *diff_gc_total_bytes_func;
static Function *jlarray_data_owner_func;
static GlobalVariable *jlgetworld_global;
// placeholder functions
static Function *gcroot_flush_func;
static Function *except_enter_func;
static Function *pointer_from_objref_func;
static std::vector<Type *> two_pvalue_llvmt;
static std::vector<Type *> three_pvalue_llvmt;
static std::vector<Type *> four_pvalue_llvmt;
static std::map<jl_fptr_t, Function*> builtin_func_map;
// --- code generation ---
extern "C" {
int globalUnique = 0;
}
static bool isbits_spec(jl_value_t *jt, bool allow_singleton = true)
{
return jl_isbits(jt) && jl_is_leaf_type(jt) &&
(allow_singleton || (jl_datatype_size(jt) > 0) || (jl_datatype_nfields(jt) > 0));
}
static MDNode *best_tbaa(jl_value_t *jt) {
jt = jl_unwrap_unionall(jt);
if (!jl_is_datatype(jt))
return tbaa_value;
if (jl_is_abstracttype(jt))
return tbaa_value;
// If we're here, we know all subtypes are (im)mutable, even if we
// don't know what the exact type is
return jl_is_mutable(jt) ? tbaa_mutab : tbaa_immut;
}
// metadata tracking for a llvm Value* during codegen
struct jl_cgval_t {
Value *V; // may be of type T* or T, or set to NULL if ghost (or if the value has not been initialized yet, for a variable definition)
Value *TIndex; // if `V` is an unboxed (tagged) Union described by `typ`, this gives the DataType index (1-based, small int) as an i8
jl_value_t *constant; // constant value (rooted in linfo.def.roots)
Value *gcroot; // the gcroot associated with V (if it has one)
jl_value_t *typ; // the original type of V, never NULL
bool isboxed; // whether this value is a jl_value_t* allocated on the heap with the right type tag
bool isghost; // whether this value is "ghost"
bool isimmutable; // V points to something that is definitely immutable (e.g. single-assignment, but including memory)
MDNode *tbaa; // The related tbaa node. Non-NULL iff this holds an address.
bool ispointer() const
{
// whether this value is compatible with `data_pointer`
return tbaa != nullptr;
}
//bool isvalue() const
//{
// // whether this value is compatible with loading into registers (`emit_unbox` without an explicit type)
// return isbits_spec(typ) && (!ispointer() || constant);
//}
jl_cgval_t(Value *V, Value *gcroot, bool isboxed, jl_value_t *typ, Value *tindex) : // general constructor (with pointer type auto-detect)
V(V), // V is allowed to be NULL in a jl_varinfo_t context, but not during codegen contexts
TIndex(tindex),
constant(NULL),
gcroot(gcroot),
typ(typ),
isboxed(isboxed),
isghost(false),
isimmutable(isboxed && jl_is_immutable_datatype(typ)),
tbaa(isboxed ? best_tbaa(typ) : nullptr)
{
assert(!(isboxed && TIndex != NULL));
assert(TIndex == NULL || TIndex->getType() == T_int8);
}
jl_cgval_t(jl_value_t *typ) : // ghost value constructor
V(NULL),
TIndex(NULL),
constant(((jl_datatype_t*)typ)->instance),
gcroot(NULL),
typ(typ),
isboxed(false),
isghost(true),
isimmutable(true),
tbaa(nullptr)
{
assert(jl_is_datatype(typ));
assert(constant);
}
jl_cgval_t(const jl_cgval_t &v, jl_value_t *typ, Value *tindex) : // copy constructor with new type
V(v.V),
TIndex(tindex),
constant(v.constant),
gcroot(v.gcroot),
typ(typ),
isboxed(v.isboxed),
isghost(v.isghost),
isimmutable(v.isimmutable),
tbaa(v.tbaa)
{
// this constructor expects we had a badly or equivalently typed version
// make sure we aren't discarding the actual type information
if (v.TIndex) {
assert((TIndex == NULL) == jl_is_leaf_type(typ));
}
else {
assert(isboxed || v.typ == typ || tindex);
}
}
jl_cgval_t() : // undef / unreachable / default constructor
V(UndefValue::get(T_void)),
TIndex(NULL),
constant(NULL),
gcroot(NULL),
typ(jl_bottom_type),
isboxed(false),
isghost(true),
isimmutable(true),
tbaa(nullptr)
{
}
};
// per-local-variable information
struct jl_varinfo_t {
Instruction *boxroot; // an address, if the var might be in a jl_value_t** stack slot (marked tbaa_const, if appropriate)
jl_cgval_t value; // a stack slot or constant value
Value *pTIndex; // i8* stack slot for the value.TIndex tag describing `value.V`
DILocalVariable *dinfo;
// if the variable might be used undefined and is not boxed
// this i1 flag is true when it is defined
Value *defFlag;
bool isSA;
bool isVolatile;
bool isArgument;
bool escapes;
bool usedUndef;
bool used;
jl_varinfo_t() : boxroot(NULL),
value(jl_cgval_t()),
pTIndex(NULL),
dinfo(NULL),
defFlag(NULL),
isSA(false),
isVolatile(false),
isArgument(false),
escapes(true),
usedUndef(false),
used(false)
{
}
};
// aggregate of array metadata
typedef struct {
Value *dataptr;
Value *len;
std::vector<Value*> sizes;
jl_value_t *ty;
} jl_arrayvar_t;
struct jl_returninfo_t {
Function *decl;
enum CallingConv {
Boxed = 0,
Register,
SRet,
Union,
Ghosts
} cc;
size_t union_bytes;
size_t union_align;
size_t union_minalign;
};
static jl_returninfo_t get_specsig_function(Module *M, const std::string &name, jl_value_t *sig, jl_value_t *jlrettype);
// information about the context of a piece of code: its enclosing
// function and module, and visible local variables and labels.
class jl_codectx_t {
public:
IRBuilder<> builder;
Function *f = NULL;
// local var info. globals are not in here.
std::vector<jl_varinfo_t> slots;
std::vector<jl_cgval_t> SAvalues;
std::vector<bool> ssavalue_assigned;
std::map<int, jl_arrayvar_t> *arrayvars = NULL;
jl_module_t *module = NULL;
jl_method_instance_t *linfo = NULL;
jl_code_info_t *source = NULL;
jl_array_t *code = NULL;
size_t world = 0;
jl_array_t *roots = NULL;
const char *name = NULL;
StringRef file{};
ssize_t *line = NULL;
Value *spvals_ptr = NULL;
Value *argArray = NULL;
Value *argCount = NULL;
std::string funcName;
int vaSlot = 0; // name of vararg argument
bool vaStack = false; // varargs stack-allocated
bool has_sret = false;
int nReqArgs = 0;
int nargs = 0;
CallInst *ptlsStates = NULL;
Value *signalPage = NULL;
Value *world_age_field = NULL;
bool debug_enabled = false;
bool is_inbounds = false;
const jl_cgparams_t *params = NULL;
jl_codectx_t(LLVMContext &llvmctx)
: builder(llvmctx) { }
~jl_codectx_t() {
assert(this->roots == NULL);
}
};
static jl_cgval_t emit_expr(jl_codectx_t &ctx, jl_value_t *expr);
static Value *emit_local_root(jl_codectx_t &ctx, jl_varinfo_t *vi = NULL);
static Value *global_binding_pointer(jl_codectx_t &ctx, jl_module_t *m, jl_sym_t *s,
jl_binding_t **pbnd, bool assign);
static jl_cgval_t emit_checked_var(jl_codectx_t &ctx, Value *bp, jl_sym_t *name, bool isvol, MDNode *tbaa);
static jl_cgval_t emit_sparam(jl_codectx_t &ctx, size_t i);
static Value *emit_condition(jl_codectx_t &ctx, const jl_cgval_t &condV, const std::string &msg);
static void allocate_gc_frame(jl_codectx_t &ctx, BasicBlock *b0);
static void CreateTrap(IRBuilder<> &irbuilder);
static Value *emit_jlcall(jl_codectx_t &ctx, Value *theFptr, Value *theF,
jl_cgval_t *args, size_t nargs);
static Value *emit_jlcall(jl_codectx_t &ctx, Value *theFptr, Value *theF,
jl_value_t **args, size_t nargs);
static Value *literal_pointer_val(jl_codectx_t &ctx, jl_value_t *p);
static GlobalVariable *prepare_global_in(Module *M, GlobalVariable *G);
#define prepare_global(G) prepare_global_in(jl_Module, (G))
// --- convenience functions for tagging llvm values with julia types ---
static GlobalVariable *get_pointer_to_constant(Constant *val, StringRef name, Module &M)
{
GlobalVariable *gv = new GlobalVariable(
M,
val->getType(),
true,
GlobalVariable::PrivateLinkage,
val,
name);
gv->setUnnamedAddr(GlobalValue::UnnamedAddr::Global);
return gv;
}
static AllocaInst *emit_static_alloca(jl_codectx_t &ctx, Type *lty, int arraysize=1)
{
return new AllocaInst(lty,
#if JL_LLVM_VERSION >= 50000
0,
#endif
ConstantInt::get(T_int32, arraysize), "", /*InsertBefore=*/ctx.ptlsStates);
}
static inline jl_cgval_t ghostValue(jl_value_t *typ)
{
if (typ == jl_bottom_type)
return jl_cgval_t(); // Undef{}
if (typ == (jl_value_t*)jl_typeofbottom_type) {
// normalize TypeofBottom to Type{Union{}}
typ = (jl_value_t*)jl_wrap_Type(jl_bottom_type);
}
if (jl_is_type_type(typ)) {
// replace T::Type{T} with T, by assuming that T must be a leaftype of some sort
jl_cgval_t constant(NULL, NULL, true, typ, NULL);
constant.constant = jl_tparam0(typ);
return constant;
}
return jl_cgval_t(typ);
}
static inline jl_cgval_t ghostValue(jl_datatype_t *typ)
{
return ghostValue((jl_value_t*)typ);
}
static inline jl_cgval_t mark_julia_const(jl_value_t *jv)
{
jl_value_t *typ;
if (jl_is_type(jv)) {
typ = (jl_value_t*)jl_wrap_Type(jv); // TODO: gc-root this?
}
else {
typ = jl_typeof(jv);
if (type_is_ghost(julia_type_to_llvm(typ))) {
return ghostValue(typ);
}
}
jl_cgval_t constant(NULL, NULL, true, typ, NULL);
constant.constant = jv;
return constant;
}
static inline jl_cgval_t mark_julia_slot(Value *v, jl_value_t *typ, Value *tindex, MDNode *tbaa)
{
// this enables lazy-copying of immutable values and stack or argument slots
assert(tbaa);
jl_cgval_t tagval(v, NULL, false, typ, tindex);
tagval.tbaa = tbaa;
tagval.isimmutable = true;
return tagval;
}
static inline jl_cgval_t mark_julia_type(jl_codectx_t &ctx, Value *v, bool isboxed, jl_value_t *typ, bool needsroot = true)
{
if (jl_is_datatype(typ) && jl_is_datatype_singleton((jl_datatype_t*)typ)) {
// no need to explicitly load/store a constant/ghost value
return ghostValue(typ);
}
if (jl_is_type_type(typ)) {
jl_value_t *tp0 = jl_tparam0(typ);
if (jl_is_leaf_type(tp0) || tp0 == jl_bottom_type) {
// replace T::Type{T} with T
return ghostValue(typ);
}
}
Type *T = julia_type_to_llvm(typ);
if (type_is_ghost(T)) {
return ghostValue(typ);
}
if (v && T->isAggregateType() && !isboxed) {
// eagerly put this back onto the stack
// llvm mem2reg pass will remove this if unneeded
Value *loc;
if (Constant *cv = dyn_cast<Constant>(v)) {
loc = get_pointer_to_constant(cv, "", *jl_Module);
}
else {
loc = emit_static_alloca(ctx, T);
ctx.builder.CreateStore(v, loc);
}
return mark_julia_slot(loc, typ, NULL, tbaa_stack);
}
Value *froot = NULL;
if (needsroot && isboxed) {
froot = emit_local_root(ctx);
ctx.builder.CreateStore(v, froot);
}
return jl_cgval_t(v, froot, isboxed, typ, NULL);
}
static inline jl_cgval_t mark_julia_type(jl_codectx_t &ctx, Value *v, bool isboxed, jl_datatype_t *typ, bool needsroot = true)
{
return mark_julia_type(ctx, v, isboxed, (jl_value_t*)typ, needsroot);
}
// see if it might be profitable (and cheap) to change the type of v to typ
static inline jl_cgval_t update_julia_type(jl_codectx_t &ctx, const jl_cgval_t &v, jl_value_t *typ)
{
if (v.typ == typ || v.typ == jl_bottom_type || v.constant || typ == (jl_value_t*)jl_any_type || jl_egal(v.typ, typ))
return v; // fast-path
if (jl_is_leaf_type(v.typ) && !jl_is_kind(v.typ)) {
if (jl_is_leaf_type(typ) && !jl_is_kind(typ) && !((jl_datatype_t*)typ)->abstract && !((jl_datatype_t*)v.typ)->abstract) {
// type mismatch: changing from one leaftype to another
CreateTrap(ctx.builder);
return jl_cgval_t();
}
return v; // doesn't improve type info
}
if (v.TIndex) {
if (!jl_is_leaf_type(typ))
return v; // not worth trying to improve type info
if (!isbits_spec(typ)) {
// discovered that this union-split type must actually be isboxed
if (v.V) {
return jl_cgval_t(v.V, v.gcroot, true, typ, NULL);
}
else {
// type mismatch (there weren't any boxed values in the union)
CreateTrap(ctx.builder);
return jl_cgval_t();
}
}
}
Type *T = julia_type_to_llvm(typ);
if (type_is_ghost(T))
return ghostValue(typ);
return jl_cgval_t(v, typ, NULL);
}
// --- allocating local variables ---
static jl_sym_t *slot_symbol(jl_codectx_t &ctx, int s)
{
return (jl_sym_t*)jl_array_ptr_ref(ctx.source->slotnames, s);
}
static void store_def_flag(jl_codectx_t &ctx, const jl_varinfo_t &vi, bool val)
{
assert((!vi.boxroot || vi.pTIndex) && "undef check is null pointer for boxed things");
assert(vi.usedUndef && vi.defFlag && "undef flag codegen corrupted");
ctx.builder.CreateStore(ConstantInt::get(T_int1, val), vi.defFlag, vi.isVolatile);
}
static void alloc_def_flag(jl_codectx_t &ctx, jl_varinfo_t& vi)
{
assert((!vi.boxroot || vi.pTIndex) && "undef check is null pointer for boxed things");
if (vi.usedUndef) {
vi.defFlag = emit_static_alloca(ctx, T_int1);
store_def_flag(ctx, vi, false);
}
}
// --- utilities ---
static void CreateTrap(IRBuilder<> &irbuilder)
{
Function *f = irbuilder.GetInsertBlock()->getParent();
Function *trap_func = Intrinsic::getDeclaration(
f->getParent(),
Intrinsic::trap);
irbuilder.CreateCall(trap_func);
irbuilder.CreateUnreachable();
BasicBlock *newBB = BasicBlock::Create(irbuilder.getContext(), "after_noret", f);
irbuilder.SetInsertPoint(newBB);
}
#if 0 // this code is likely useful, but currently unused
#ifndef JL_NDEBUG
static void CreateConditionalAbort(IRBuilder<> &irbuilder, Value *test)
{
Function *f = irbuilder.GetInsertBlock()->getParent();
BasicBlock *abortBB = BasicBlock::Create(jl_LLVMContext, "debug_abort", f);
BasicBlock *postBB = BasicBlock::Create(jl_LLVMContext, "post_abort", f);
irbuilder.CreateCondBr(test, abortBB, postBB);
irbuilder.SetInsertPoint(abortBB);
Function *trap_func = Intrinsic::getDeclaration(
f->getParent(),
Intrinsic::trap);
irbuilder.CreateCall(trap_func);
irbuilder.CreateUnreachable();
irbuilder.SetInsertPoint(postBB);
}
#endif
#endif
static void emit_write_barrier(jl_codectx_t&, Value*, Value*);
#include "cgutils.cpp"
static void jl_rethrow_with_add(const char *fmt, ...)
{
jl_ptls_t ptls = jl_get_ptls_states();
if (jl_typeis(ptls->exception_in_transit, jl_errorexception_type)) {
char *str = jl_string_data(jl_fieldref(ptls->exception_in_transit,0));
char buf[1024];
va_list args;
va_start(args, fmt);
int nc = vsnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
nc += snprintf(buf+nc, sizeof(buf)-nc, ": %s", str);
jl_value_t *msg = jl_pchar_to_string(buf, nc);
JL_GC_PUSH1(&msg);
jl_throw(jl_new_struct(jl_errorexception_type, msg));
}
jl_rethrow();
}
// given a value marked with type `v.typ`, compute the mapping and/or boxing to return a value of type `typ`
static jl_cgval_t convert_julia_type(jl_codectx_t &ctx, const jl_cgval_t &v, jl_value_t *typ, bool needsroot = true)
{
if (typ == (jl_value_t*)jl_typeofbottom_type)
return ghostValue(typ); // normalize TypeofBottom to Type{Union{}}
if (v.typ == typ || v.typ == jl_bottom_type || jl_egal(v.typ, typ))
return v; // fast-path
Type *T = julia_type_to_llvm(typ);
if (type_is_ghost(T))
return ghostValue(typ);
Value *new_tindex = NULL;
if (jl_is_leaf_type(typ)) {
if (v.TIndex && !isbits_spec(typ)) {
// discovered that this union-split type must actually be isboxed
if (v.V) {
return jl_cgval_t(v.V, v.gcroot, true, typ, NULL);
}
else {
// type mismatch: there weren't any boxed values in the union
CreateTrap(ctx.builder);
return jl_cgval_t();
}
}
if (jl_is_leaf_type(v.typ) && !jl_is_kind(v.typ) && !((jl_datatype_t*)v.typ)->abstract) {
if (jl_is_leaf_type(typ) && !jl_is_kind(typ) && !((jl_datatype_t*)typ)->abstract) {
// type mismatch: changing from one leaftype to another
CreateTrap(ctx.builder);
return jl_cgval_t();
}
}
}
else {
bool makeboxed = false;
if (v.TIndex) {
// previous value was a split union, compute new index, or box
new_tindex = ConstantInt::get(T_int8, 0x80);
SmallBitVector skip_box(1, true);
Value *tindex = ctx.builder.CreateAnd(v.TIndex, ConstantInt::get(T_int8, 0x7f));
if (jl_is_uniontype(typ)) {
// compute the TIndex mapping from v.typ -> typ
unsigned counter = 0;
for_each_uniontype_small(
// for each old union-split value
[&](unsigned idx, jl_datatype_t *jt) {
unsigned new_idx = get_box_tindex(jt, typ);
bool t;
if (new_idx) {
// found a matching element,
// match it against either the unboxed index
Value *cmp = ctx.builder.CreateICmpEQ(tindex, ConstantInt::get(T_int8, idx));
new_tindex = ctx.builder.CreateSelect(cmp, ConstantInt::get(T_int8, new_idx), new_tindex);
t = true;
}
else if (!jl_subtype((jl_value_t*)jt, typ)) {
// new value doesn't need to be boxed
// since it isn't part of the new union
t = true;
}
else {
// will actually need to box this element
// since it appeared as a leaftype in the original type
// but not in the remark type
t = false;
}
skip_box.resize(idx + 1, t);
},
v.typ,
counter);
}
// some of the values are still unboxed
if (!isa<Constant>(new_tindex)) {
Value *wasboxed = NULL;
// check if some of the old values might have been boxed
// and copy that information over into the new tindex
if (v.ispointer() && v.V && !isa<AllocaInst>(v.V)) {
wasboxed = ctx.builder.CreateAnd(v.TIndex, ConstantInt::get(T_int8, 0x80));
new_tindex = ctx.builder.CreateOr(wasboxed, new_tindex);
wasboxed = ctx.builder.CreateICmpNE(wasboxed, ConstantInt::get(T_int8, 0));
// may need to handle compute_box_tindex for some of the values
BasicBlock *currBB = ctx.builder.GetInsertBlock();
Value *union_box_dt = NULL;
Value *union_box_tindex = ConstantInt::get(T_int8, 0x80);
unsigned counter = 0;
for_each_uniontype_small(
// for each new union-split value
[&](unsigned idx, jl_datatype_t *jt) {
unsigned old_idx = get_box_tindex(jt, v.typ);
if (old_idx == 0) {
if (!union_box_dt) {
BasicBlock *isaBB = BasicBlock::Create(jl_LLVMContext, "union_isa", ctx.f);
ctx.builder.SetInsertPoint(isaBB);
union_box_dt = emit_typeof(ctx, v.V);
}
// didn't handle this item before, select its new union index
Value *cmp = ctx.builder.CreateICmpEQ(maybe_decay_untracked(literal_pointer_val(ctx, (jl_value_t*)jt)), union_box_dt);
union_box_tindex = ctx.builder.CreateSelect(cmp, ConstantInt::get(T_int8, 0x80 | idx), union_box_tindex);
}
},
typ,
counter);
if (union_box_dt) {
BasicBlock *isaBB = ctx.builder.GetInsertBlock();
BasicBlock *postBB = BasicBlock::Create(jl_LLVMContext, "post_union_isa", ctx.f);
ctx.builder.CreateBr(postBB);
ctx.builder.SetInsertPoint(currBB);
Value *wasunknown = ctx.builder.CreateICmpEQ(v.TIndex, ConstantInt::get(T_int8, 0x80));
ctx.builder.CreateCondBr(wasunknown, isaBB, postBB);
ctx.builder.SetInsertPoint(postBB);
PHINode *tindex_phi = ctx.builder.CreatePHI(T_int8, 2);
tindex_phi->addIncoming(new_tindex, currBB);
tindex_phi->addIncoming(union_box_tindex, isaBB);
new_tindex = tindex_phi;
}
}
if (!skip_box.all()) {
// some values weren't unboxed in the new union
// box them now (tindex above already selected 0x80 = box for them)
// root the result, and return a new mark_julia_slot over the result
Value *boxv = box_union(ctx, v, skip_box);
Value *froot = NULL;
if (needsroot) {
// build a new gc-root, as needed
froot = emit_local_root(ctx);
Value *newroot = boxv;
if (wasboxed || v.gcroot) { // oldbox might be all ghost values (which don't need roots)
// store either the old box or the new box into the gc-root (skip_box ensures these are mutually-exclusive)
// need to clone the value from `v.gcroot` if this isn't a new box
Value *oldroot;
if (v.gcroot)
oldroot = ctx.builder.CreateLoad(v.gcroot);
else
oldroot = v.V;
newroot = ctx.builder.CreateSelect(wasboxed, emit_bitcast(ctx, oldroot, boxv->getType()), newroot);
}
ctx.builder.CreateStore(newroot, froot);
}
if (v.V == NULL) {
// v.V might be NULL if it was all ghost objects before
return jl_cgval_t(boxv, froot, false, typ, new_tindex);
}
else {
Value *isboxv = ctx.builder.CreateIsNotNull(boxv);
Value *slotv;
MDNode *tbaa;
bool isimmutable;
if (v.ispointer()) {
slotv = v.V;
tbaa = v.tbaa;
isimmutable = v.isimmutable;
}
else {
slotv = emit_static_alloca(ctx, v.V->getType());
ctx.builder.CreateStore(v.V, slotv);
tbaa = tbaa_stack;
isimmutable = true;
}
slotv = ctx.builder.CreateSelect(isboxv,
decay_derived(boxv), emit_bitcast(ctx, slotv, boxv->getType()));
jl_cgval_t newv = jl_cgval_t(slotv, froot, false, typ, new_tindex);
newv.tbaa = tbaa;
newv.isimmutable = isimmutable;
return newv;
}
}
}
else {
new_tindex = NULL;
makeboxed = true;
}
}
else if (!v.isboxed && jl_is_uniontype(typ)) {
// previous value was unboxed (leaftype), statically compute union tindex