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tcompiler.cpp
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tcompiler.cpp
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/* See Copyright Notice in ../LICENSE.txt */
#include "tcompiler.h"
#include "tkind.h"
#include "terrastate.h"
extern "C" {
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
}
#include <assert.h>
#include <stdio.h>
#include <inttypes.h>
#include <cmath>
#include <sstream>
#include "llvmheaders.h"
#include "tcompilerstate.h" //definition of terra_CompilerState which contains LLVM state
#include "tobj.h"
#if LLVM_VERSION < 170
// FIXME (Elliott): need to restore the manual inliner in LLVM 17
#include "tinline.h"
#endif
#include "llvm/Support/ManagedStatic.h"
#if LLVM_VERSION < 120
#include "llvm/ExecutionEngine/OrcMCJITReplacement.h"
#endif
#include "llvm/Support/Atomic.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "tllvmutil.h"
#ifdef _WIN32
#include <io.h>
#include <time.h>
#include "twindows.h"
#undef interface
#else
#include <unistd.h>
#include <sys/time.h>
#endif
using namespace llvm;
#define TERRALIB_FUNCTIONS(_) \
_(inittarget, 1) \
_(freetarget, 0) \
_(initcompilationunit, 1) \
_(compilationunitaddvalue, \
1) /*entry point from lua into compiler to generate LLVM for a function, other \
functions it calls may not yet exist*/ \
_(freecompilationunit, 0) \
_(jit, 1) /*entry point from lua into compiler to actually invoke the JIT by calling \
getPointerToFunction*/ \
_(llvmsizeof, 1) \
_(disassemble, 1) \
_(pointertolightuserdata, 0) /*because luajit ffi doesn't do this...*/ \
_(bindtoluaapi, 0) \
_(gcdebug, 0) \
_(saveobjimpl, 1) \
_(linklibraryimpl, 1) \
_(linkllvmimpl, 1) \
_(currenttimeinseconds, 0) \
_(isintegral, 0) \
_(dumpmodule, 1)
#define DEF_LIBFUNCTION(nm, isclo) static int terra_##nm(lua_State *L);
TERRALIB_FUNCTIONS(DEF_LIBFUNCTION)
#undef DEF_LIBFUNCTION
#ifdef PRINT_LLVM_TIMING_STATS
static llvm_shutdown_obj llvmshutdownobj;
#endif
#define TERRA_DUMP_FUNCTION(t) (t)->print(llvm::errs(), nullptr)
#define TERRA_DUMP_TYPE(t) (t)->print(llvm::errs(), true)
#define TERRA_DUMP_MODULE(t) (t)->print(llvm::errs(), nullptr)
#define MEM_ARRAY_THRESHOLD 64
struct DisassembleFunctionListener : public JITEventListener {
TerraCompilationUnit *CU;
terra_State *T;
DisassembleFunctionListener(TerraCompilationUnit *CU_) : CU(CU_), T(CU_->T) {}
void InitializeDebugData(StringRef name, object::SymbolRef::Type type, uint64_t sz) {
if (type == object::SymbolRef::ST_Function) {
#if !defined(__arm__) && !defined(__linux__) && !defined(__FreeBSD__)
name = name.substr(1);
#endif
void *addr = (void *)CU->ee->getFunctionAddress(name.str());
if (addr) {
assert(addr);
TerraFunctionInfo &fi = T->C->functioninfo[addr];
fi.ctx = CU->TT->ctx;
fi.name = name.str();
fi.addr = addr;
fi.size = sz;
}
}
}
virtual void NotifyObjectEmitted(const object::ObjectFile &Obj,
const RuntimeDyld::LoadedObjectInfo &L) {
auto size_map = llvm::object::computeSymbolSizes(Obj);
for (auto &S : size_map) {
object::SymbolRef sym = S.first;
auto name = sym.getName();
auto type = sym.getType();
if (name && type) InitializeDebugData(name.get(), type.get(), S.second);
}
}
};
class TerraSectionMemoryManager : public SectionMemoryManager {
public:
TerraSectionMemoryManager(TerraCompilationUnit *CU_in, MemoryMapper *MM = nullptr)
: SectionMemoryManager(MM) {
CU = CU_in;
}
TerraSectionMemoryManager(const TerraSectionMemoryManager &) = delete;
void operator=(const TerraSectionMemoryManager &) = delete;
void notifyObjectLoaded(ExecutionEngine *EE, const object::ObjectFile &obj) override {
auto size_map = llvm::object::computeSymbolSizes(obj);
for (auto &S : size_map) {
object::SymbolRef sym = S.first;
auto name = sym.getName();
auto type = sym.getType();
// printf("notify: %s %d %#010llx\n", cantFail(std::move(name)).data(),
// cantFail(std::move(type)), S.second);
if (name && type)
static_cast<DisassembleFunctionListener *>(CU->jiteventlistener)
->InitializeDebugData(name.get(), type.get(), S.second);
}
}
private:
TerraCompilationUnit *CU;
};
static double CurrentTimeInSeconds() {
#ifdef _WIN32
static uint64_t freq = 0;
if (freq == 0) {
LARGE_INTEGER i;
QueryPerformanceFrequency(&i);
freq = i.QuadPart;
}
LARGE_INTEGER t;
QueryPerformanceCounter(&t);
return t.QuadPart / (double)freq;
#else
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec + tv.tv_usec / 1000000.0;
#endif
}
static int terra_currenttimeinseconds(lua_State *L) {
lua_pushnumber(L, CurrentTimeInSeconds());
return 1;
}
static void AddLLVMOptions(int N, ...) {
va_list ap;
va_start(ap, N);
std::vector<const char *> ops;
ops.push_back("terra");
for (int i = 0; i < N; i++) {
const char *arg = va_arg(ap, const char *);
ops.push_back(arg);
}
cl::ParseCommandLineOptions(N + 1, &ops[0]);
}
// useful for debugging GC problems. You can attach it to
static int terra_gcdebug(lua_State *L) {
lua_newuserdata(L, sizeof(void *));
lua_getfield(L, LUA_GLOBALSINDEX, "terra");
lua_getfield(L, -1, "llvm_gcdebugmetatable");
lua_setmetatable(L, -3);
lua_pop(L, 1); // the 'terra' table
lua_setfield(L, -2, "llvm_gcdebughandle");
return 0;
}
static void RegisterFunction(struct terra_State *T, const char *name, int isclo,
lua_CFunction fn) {
if (isclo) {
lua_pushlightuserdata(T->L, (void *)T);
lua_pushcclosure(T->L, fn, 1);
} else {
lua_pushcfunction(T->L, fn);
}
lua_setfield(T->L, -2, name);
}
static llvm::sys::Mutex terrainitlock;
static int terrainitcount;
bool OneTimeInit(struct terra_State *T) {
bool success = true;
terrainitlock.lock();
terrainitcount++;
if (terrainitcount == 1) {
#ifdef PRINT_LLVM_TIMING_STATS
AddLLVMOptions(1, "-time-passes");
#endif
#if !defined(__arm__) && !defined(__aarch64__) && !defined(__PPC__)
AddLLVMOptions(1, "-x86-asm-syntax=intel");
#endif
InitializeAllTargets();
InitializeAllTargetInfos();
InitializeAllAsmPrinters();
InitializeAllAsmParsers();
InitializeAllTargetMCs();
}
terrainitlock.unlock();
return success;
}
// LLVM 3.1 doesn't enable avx even if it is present, we detect and force it here
bool HostHasAVX() {
StringMap<bool> Features;
sys::getHostCPUFeatures(Features);
return Features["avx"];
}
int terra_inittarget(lua_State *L) {
terra_State *T = terra_getstate(L, 1);
TerraTarget *TT = new TerraTarget();
TT->id = T->targets.size();
T->targets.push_back(TT);
TT->nreferences = 2;
if (!lua_isnil(L, 1)) {
TT->Triple = lua_tostring(L, 1);
} else {
TT->Triple = llvm::sys::getProcessTriple();
}
if (!lua_isnil(L, 2))
TT->CPU = lua_tostring(L, 2);
else
TT->CPU = llvm::sys::getHostCPUName().str();
#if defined(__x86_64__) || defined(_WIN32)
if (TT->CPU == "generic") {
TT->CPU = "x86-64";
}
#endif
if (!lua_isnil(L, 3))
TT->Features = lua_tostring(L, 3);
else {
#ifdef DISABLE_AVX
TT->Features = "-avx";
#else
TT->Features = HostHasAVX() ? "+avx" : "";
#endif
}
TargetOptions options;
if (lua_toboolean(L, 4)) { // FloatABIHard boolean
options.FloatABIType = FloatABI::Hard;
} else {
#ifdef __arm__
// force hard float since we currently onlly work on platforms that have it
options.FloatABIType = FloatABI::Hard;
#endif
}
TT->next_unused_id = 0;
TT->ctx = new LLVMContext();
#if LLVM_VERSION >= 150 && LLVM_VERSION < 170
// Hack: This is a workaround to avoid the opaque pointer
// transition, but we will need to deal with it eventually.
// FIXME: https://github.com/terralang/terra/issues/553
TT->ctx->setOpaquePointers(false);
#endif
std::string err;
const Target *TheTarget = TargetRegistry::lookupTarget(TT->Triple, err);
if (!TheTarget) {
luaL_error(L, "failed to initialize target for LLVM Triple: %s (%s)",
TT->Triple.c_str(), err.c_str());
}
TT->tm = TheTarget->createTargetMachine(
TT->Triple, TT->CPU, TT->Features, options,
#if defined(__linux__) || defined(__unix__)
Reloc::PIC_,
#else
#if LLVM_VERSION < 160
Optional<Reloc::Model>(),
#else
std::optional<Reloc::Model>(),
#endif
#endif
#if defined(__powerpc64__)
// On PPC the small model is limited to 16bit offsets
CodeModel::Medium,
#else
// Use small model so that we can use signed 32bits offset in the function and
// GV tables
CodeModel::Small,
#endif
#if LLVM_VERSION < 180
CodeGenOpt::Aggressive
#else
CodeGenOptLevel::Aggressive
#endif
);
TT->external = new Module("external", *TT->ctx);
TT->external->setTargetTriple(TT->Triple);
lua_pushlightuserdata(L, TT);
return 1;
}
int terra_initcompilationunit(lua_State *L) {
terra_State *T = terra_getstate(L, 1);
TerraCompilationUnit *CU = new TerraCompilationUnit();
TerraTarget *TT = (TerraTarget *)terra_tocdatapointer(L, 1);
CU->TT = TT;
CU->TT->nreferences++;
CU->nreferences = 1;
CU->T = T;
CU->C = T->C;
CU->C->nreferences++;
CU->optimize = lua_toboolean(L, 2);
int ref_table = lobj_newreftable(L);
{
Obj profile;
lua_pushvalue(L, 3);
profile.initFromStack(L, ref_table);
assert(profile.hasfield("fastmath"));
Obj mathflags;
bool ok = profile.obj("fastmath", &mathflags);
assert(ok);
llvm::FastMathFlags fastmath;
for (int i = 1; mathflags.hasfield(i); i++) {
const char *flag = mathflags.string(i);
// Thanks to LLVM's lack of support for parsing these values,
// we have to do this by hand.
if (strcmp(flag, "nnan") == 0) {
fastmath.setNoNaNs();
} else if (strcmp(flag, "ninf") == 0) {
fastmath.setNoInfs();
} else if (strcmp(flag, "nsz") == 0) {
fastmath.setNoSignedZeros();
} else if (strcmp(flag, "arcp") == 0) {
fastmath.setAllowReciprocal();
} else if (strcmp(flag, "contract") == 0) {
fastmath.setAllowContract();
} else if (strcmp(flag, "afn") == 0) {
fastmath.setApproxFunc();
} else if (strcmp(flag, "reassoc") == 0) {
fastmath.setAllowReassoc();
} else if (strcmp(flag, "fast") == 0) {
fastmath.setFast();
} else {
assert(false && "unrecognized fast math flag");
}
}
CU->fastmath = fastmath;
}
lobj_removereftable(L, ref_table);
CU->M = new Module("terra", *TT->ctx);
CU->M->setTargetTriple(TT->Triple);
CU->M->setDataLayout(TT->tm->createDataLayout());
#if LLVM_VERSION < 170
// FIXME (Elliott): need to restore the manual inliner in LLVM 17
CU->mi = new ManualInliner(TT->tm, CU->M);
CU->fpm = new FunctionPassManagerT(CU->M);
llvmutil_addtargetspecificpasses(CU->fpm, TT->tm);
llvmutil_addoptimizationpasses(CU->fpm);
CU->fpm->doInitialization();
#else
CU->fpm = new FunctionPassManager(llvmutil_createoptimizationpasses(
TT->tm, CU->lam, CU->fam, CU->cgam, CU->mam));
#endif
lua_pushlightuserdata(L, CU);
return 1;
}
static void InitializeJIT(TerraCompilationUnit *CU) {
if (CU->ee) return; // already initialized
Module *topeemodule = new Module("terra", *CU->TT->ctx);
#ifdef _WIN32
std::string MCJITTriple = CU->TT->Triple;
MCJITTriple.append("-elf"); // on windows we need to use an elf container because
// coff is not supported yet
topeemodule->setTargetTriple(MCJITTriple);
#else
topeemodule->setTargetTriple(CU->TT->Triple);
#endif
std::string err;
std::vector<std::string> mattrs;
if (!CU->TT->Features.empty()) mattrs.push_back(CU->TT->Features);
EngineBuilder eb(UNIQUEIFY(Module, topeemodule));
eb.setErrorStr(&err)
.setMCPU(CU->TT->CPU)
.setMAttrs(mattrs)
.setEngineKind(EngineKind::JIT)
.setTargetOptions(CU->TT->tm->Options)
.setOptLevel(
#if LLVM_VERSION < 180
CodeGenOpt::Aggressive
#else
CodeGenOptLevel::Aggressive
#endif
)
.setMCJITMemoryManager(std::make_unique<TerraSectionMemoryManager>(CU))
#if LLVM_VERSION < 120
.setUseOrcMCJITReplacement(true)
#endif
;
CU->ee = eb.create();
if (!CU->ee) terra_reporterror(CU->T, "llvm: %s\n", err.c_str());
CU->jiteventlistener = new DisassembleFunctionListener(CU);
}
int terra_compilerinit(struct terra_State *T) {
if (!OneTimeInit(T)) return LUA_ERRRUN;
lua_getfield(T->L, LUA_GLOBALSINDEX, "terra");
#define REGISTER_FN(name, isclo) RegisterFunction(T, #name, isclo, terra_##name);
TERRALIB_FUNCTIONS(REGISTER_FN)
#undef REGISTER_FN
lua_pushnumber(T->L, LLVM_VERSION);
lua_setfield(T->L, -2, "llvmversion");
lua_pop(T->L, 1); // remove terra from stack
T->C = new terra_CompilerState();
memset(T->C, 0, sizeof(terra_CompilerState));
T->C->nreferences = 1;
return 0;
}
void freetarget(TerraTarget *TT) {
assert(TT->nreferences > 0);
if (0 == --TT->nreferences) {
delete TT->external;
delete TT->tm;
delete TT->ctx;
delete TT;
}
}
int terra_freetarget(lua_State *L) {
freetarget((TerraTarget *)terra_tocdatapointer(L, 1));
return 0;
}
static void freecompilationunit(TerraCompilationUnit *CU) {
assert(CU->nreferences > 0);
if (0 == --CU->nreferences) {
#if LLVM_VERSION < 170
// FIXME (Elliott): need to restore the manual inliner in LLVM 17
delete CU->mi;
#endif
delete CU->fpm;
if (CU->ee) {
CU->ee->UnregisterJITEventListener(CU->jiteventlistener);
delete CU->jiteventlistener;
delete CU->ee;
}
delete CU->M; // we own the module so we delete it
freetarget(CU->TT);
terra_compilerfree(CU->C); // decrement reference count to compiler
delete CU;
}
}
int terra_freecompilationunit(lua_State *L) {
freecompilationunit((TerraCompilationUnit *)terra_tocdatapointer(L, 1));
return 0;
}
int terra_compilerfree(struct terra_CompilerState *C) {
assert(C->nreferences > 0);
if (0 == --C->nreferences) {
if (C->MB.base() != NULL) {
llvm::sys::Memory::releaseMappedMemory(C->MB);
}
C->functioninfo.clear();
delete C;
}
return 0;
}
static void GetStructEntries(Obj *typ, Obj *entries) {
Obj layout;
if (!typ->obj("cachedlayout", &layout)) {
assert(!"typechecked failed to complete type needed by the compiler, this is a bug.");
}
layout.obj("entries", entries);
}
struct TType { // contains llvm raw type pointer and any metadata about it we need
Type *type;
bool issigned;
bool islogical;
bool incomplete; // does this aggregate type or its children include an incomplete
// struct
};
class Types {
TerraCompilationUnit *CU;
terra_State *T;
TType *GetIncomplete(Obj *typ) {
TType *t = NULL;
if (!LookupTypeCache(typ, &t)) {
assert(t);
switch (typ->kind("kind")) {
case T_pointer: {
Obj base;
typ->obj("type", &base);
Type *baset = (base.kind("kind") == T_functype)
? Type::getInt8Ty(*CU->TT->ctx)
: GetIncomplete(&base)->type;
t->type = PointerType::get(baset, typ->number("addressspace"));
} break;
case T_array: {
Obj base;
typ->obj("type", &base);
int N = typ->number("N");
TType *baset = GetIncomplete(&base);
t->type = ArrayType::get(baset->type, N);
t->incomplete = baset->incomplete;
} break;
case T_struct: {
StructType *st = CreateStruct(typ);
t->type = st;
t->incomplete = st->isOpaque();
} break;
case T_vector: {
Obj base;
typ->obj("type", &base);
int N = typ->number("N");
TType *ttype =
GetIncomplete(&base); // vectors can only contain primitives,
// so the type must be complete
Type *baseType = ttype->type;
t->issigned = ttype->issigned;
t->islogical = ttype->islogical;
t->type = VectorType::get(baseType, N, false);
} break;
case T_primitive: {
CreatePrimitiveType(typ, t);
} break;
case T_niltype: {
#if LLVM_VERSION < 170
t->type = Type::getInt8PtrTy(*CU->TT->ctx);
#else
t->type = PointerType::get(*CU->TT->ctx, 0);
#endif
} break;
case T_opaque: {
t->type = Type::getInt8Ty(*CU->TT->ctx);
} break;
default: {
printf("kind = %d, %s\n", typ->kind("kind"),
tkindtostr(typ->kind("kind")));
terra_reporterror(T, "type not understood or not primitive\n");
} break;
}
}
assert(t && t->type);
return t;
}
void CreatePrimitiveType(Obj *typ, TType *t) {
int bytes = typ->number("bytes");
switch (typ->kind("type")) {
case T_float: {
if (bytes == 4) {
t->type = Type::getFloatTy(*CU->TT->ctx);
} else {
assert(bytes == 8);
t->type = Type::getDoubleTy(*CU->TT->ctx);
}
} break;
case T_integer: {
t->issigned = typ->boolean("signed");
t->type = Type::getIntNTy(*CU->TT->ctx, bytes * 8);
} break;
case T_logical: {
t->type = Type::getInt8Ty(*CU->TT->ctx);
t->islogical = true;
} break;
default: {
printf("kind = %d, %s\n", typ->kind("kind"),
tkindtostr(typ->kind("type")));
terra_reporterror(T, "type not understood");
} break;
}
}
Type *FunctionPointerType() {
#if LLVM_VERSION < 170
return Type::getInt8PtrTy(*CU->TT->ctx);
#else
return PointerType::get(*CU->TT->ctx, 0);
#endif
}
bool LookupTypeCache(Obj *typ, TType **t) {
*t = (TType *)CU->symbols->getud(typ); // try to look up the cached type
if (*t == NULL) {
CU->symbols->push();
typ->push();
*t = (TType *)lua_newuserdata(T->L, sizeof(TType));
lua_settable(T->L, -3);
lua_pop(T->L, 1);
memset(*t, 0, sizeof(TType));
assert(*t != NULL);
return false;
}
return true;
}
StructType *CreateStruct(Obj *typ) {
// Note: historically, Terra tried to reuse the types generated by Clang when
// importing C headers. This is why we maintain an `llvm_definingfunction` and
// `llvm_definingtarget`. As of the opaque pointer migration (circa LLVM 15-17),
// this approach no longer works. But it turns out that we don't need it: we can
// just define the structs below, as we've always been doing (and found was
// required for external targets).
std::string name = typ->asstring("name");
bool isreserved = beginsWith(name, "struct.") || beginsWith(name, "union.");
name = (isreserved) ? std::string("$") + name : name;
if (isreserved)
return StructType::create(*CU->TT->ctx, name);
else
return StructType::create(*CU->TT->ctx);
}
bool beginsWith(const std::string &s, const std::string &prefix) {
return s.substr(0, prefix.size()) == prefix;
}
void LayoutStruct(StructType *st, Obj *typ) {
Obj layout;
GetStructEntries(typ, &layout);
int N = layout.size();
std::vector<Type *> entry_types;
MaybeAlign unionAlign; // minimum union alignment
Type *unionType = NULL; // type with the largest alignment constraint
size_t unionAlignSz = 0; // size of type with largest alignment contraint
size_t unionSz = 0; // allocation size of the largest member
for (int i = 0; i < N; i++) {
Obj v;
layout.objAt(i, &v);
Obj vt;
v.obj("type", &vt);
Type *fieldtype = Get(&vt)->type;
bool inunion = v.boolean("inunion");
if (inunion) {
Align align = CU->getDataLayout().getABITypeAlign(fieldtype);
// orequal is to make sure we have a non-null
// type even if it is a 0-sized struct
if (encode(MaybeAlign(align)) >= encode(unionAlign)) {
unionAlign = align;
unionType = fieldtype;
unionAlignSz = CU->getDataLayout().getTypeAllocSize(fieldtype);
}
size_t allocSize = CU->getDataLayout().getTypeAllocSize(fieldtype);
if (allocSize > unionSz) unionSz = allocSize;
// check if this is the last member of the union, and if it is, add it to
// our struct
Obj nextObj;
if (i + 1 < N) layout.objAt(i + 1, &nextObj);
if (i + 1 == N ||
nextObj.number("allocation") != v.number("allocation")) {
std::vector<Type *> union_types;
assert(unionType);
union_types.push_back(unionType);
if (unionAlignSz <
unionSz) { // the type with the largest alignment requirement is
// not the type with the largest size, pad this struct
// so that it will fit the largest type
size_t diff = unionSz - unionAlignSz;
union_types.push_back(
ArrayType::get(Type::getInt8Ty(*CU->TT->ctx), diff));
}
entry_types.push_back(StructType::get(*CU->TT->ctx, union_types));
unionAlign = MaybeAlign();
unionType = NULL;
unionAlignSz = 0;
unionSz = 0;
}
} else {
entry_types.push_back(fieldtype);
}
}
st->setBody(entry_types);
VERBOSE_ONLY(T) {
printf("Struct Layout Is:\n");
TERRA_DUMP_TYPE(st);
printf("\nEnd Layout\n");
}
}
public:
Types(TerraCompilationUnit *CU_) : CU(CU_), T(CU_->T) {}
TType *Get(Obj *typ) {
assert(typ->kind("kind") != T_functype); // Get should not be called on function
// directly, only function pointers
TType *t = GetIncomplete(typ);
if (t->incomplete) {
assert(t->type->isAggregateType());
switch (typ->kind("kind")) {
case T_struct: {
LayoutStruct(cast<StructType>(t->type), typ);
} break;
case T_array: {
Obj base;
typ->obj("type", &base);
Get(&base); // force base type to be completed
} break;
default:
terra_reporterror(
T, "type marked incomplete is not an array or struct\n");
}
}
t->incomplete = false;
return t;
}
bool IsUnitType(Obj *t) {
t->pushfield("isunit");
t->push();
lua_call(T->L, 1, 1);
bool result = lua_toboolean(T->L, -1);
lua_pop(T->L, 1);
return result;
}
void EnsureTypeIsComplete(Obj *typ) { Get(typ); }
void EnsurePointsToCompleteType(Obj *ptrTy) {
if (ptrTy->kind("kind") == T_pointer) {
Obj objTy;
ptrTy->obj("type", &objTy);
EnsureTypeIsComplete(&objTy);
} // otherwise it is niltype and already complete
}
static void PointsToType(Obj *ptrTy, Obj *result) {
if (ptrTy->kind("kind") == T_pointer) {
ptrTy->obj("type", result);
} else {
printf("unexpected kind = %d, %s\n", ptrTy->kind("kind"),
tkindtostr(ptrTy->kind("kind")));
assert(false);
}
}
};
// helper function to alloca at the beginning of function
static AllocaInst *CreateAlloca(IRBuilder<> *B, Type *Ty, Value *ArraySize = 0,
const Twine &Name = "") {
BasicBlock *entry = &B->GetInsertBlock()->getParent()->getEntryBlock();
IRBuilder<> TmpB(entry,
entry->begin()); // make sure alloca are at the beginning of the
// function this is needed because alloca's that do
// not dominate the function do weird things
return TmpB.CreateAlloca(Ty, ArraySize, Name);
}
static Value *CreateConstGEP2_32(IRBuilder<> *B, Value *Ptr, Type *ValueType,
unsigned Idx0, unsigned Idx1) {
return B->CreateConstGEP2_32(ValueType, Ptr, Idx0, Idx1);
}
// functions that handle the details of the x86_64 ABI (this really should be handled by
// LLVM...)
struct CCallingConv {
TerraCompilationUnit *CU;
terra_State *T;
lua_State *L;
terra_CompilerState *C;
Types *Ty;
bool return_empty_struct_as_void;
bool aarch64_cconv;
bool amdgpu_cconv;
bool ppc64_cconv;
int ppc64_float_limit;
int ppc64_int_limit;
bool ppc64_count_used;
bool spirv_cconv;
bool wasm_cconv;
CCallingConv(TerraCompilationUnit *CU_, Types *Ty_)
: CU(CU_),
T(CU_->T),
L(CU_->T->L),
C(CU_->T->C),
Ty(Ty_),
return_empty_struct_as_void(false),
aarch64_cconv(false),
amdgpu_cconv(false),
ppc64_cconv(false),
ppc64_float_limit(0),
ppc64_int_limit(0),
ppc64_count_used(false),
spirv_cconv(false),
wasm_cconv(false) {
auto Triple = CU->TT->tm->getTargetTriple();
switch (Triple.getArch()) {
case Triple::ArchType::amdgcn: {
return_empty_struct_as_void = true;
amdgpu_cconv = true;
} break;
case Triple::ArchType::aarch64:
case Triple::ArchType::aarch64_be: {
aarch64_cconv = true;
// Hack: we share code with the PPC64 cconv, so configure here.
ppc64_float_limit = 4;
ppc64_int_limit = 2;
ppc64_count_used = false;
} break;
case Triple::ArchType::ppc64:
case Triple::ArchType::ppc64le: {
ppc64_cconv = true;
ppc64_float_limit = 8;
ppc64_int_limit = 8;
ppc64_count_used = true;
} break;
#if LLVM_VERSION >= 150
case Triple::ArchType::spirv32:
case Triple::ArchType::spirv64: {
return_empty_struct_as_void = true;
spirv_cconv = true;
} break;
#endif
case Triple::ArchType::wasm32:
case Triple::ArchType::wasm64: {
wasm_cconv = true;
} break;
default:
break;
}
switch (Triple.getOS()) {
case Triple::OSType::Win32: {
return_empty_struct_as_void = true;
} break;
default:
break;
}
}
enum RegisterClass {
C_NO_CLASS = 0,
C_SSE_FLOAT = 1,
C_SSE_DOUBLE = 2,
C_INTEGER = 3,
C_MEMORY = 4
};
enum ArgumentKind {
C_PRIMITIVE, // passed without modifcation (i.e. any non-aggregate type)
C_AGGREGATE_REG, // aggregate passed through registers
C_AGGREGATE_MEM, // aggregate passed through memory
C_ARRAY_REG, // aggregate passed through registers as an array
};
struct Argument {
ArgumentKind kind;
TType *type; // orignal type for the object
Type *cctype; // if type == C_AGGREGATE_REG, this is a struct that holds a list
// of the values that goes into the registers
// if type == CC_PRIMITIVE, this is the struct that this type
// appear in the argument list and the type should be coerced to
Argument() {}
Argument(ArgumentKind kind, TType *type, Type *cctype = NULL) {
this->kind = kind;
this->type = type;
this->cctype = cctype ? cctype : type->type;
}
int GetNumberOfTypesInParamList(Type *type) {
StructType *st = dyn_cast<StructType>(type);
if (st) {
size_t total = 0;
for (auto elt_type : st->elements()) {
total += GetNumberOfTypesInParamList(elt_type);
}
return total;
}
return 1;
}
int GetNumberOfTypesInParamList() {
if (this->kind == C_AGGREGATE_REG)
return GetNumberOfTypesInParamList(this->cctype);
return 1;
}
};
struct Classification {
Argument returntype;
std::vector<Argument> paramtypes;
FunctionType *fntype;
};
RegisterClass Meet(RegisterClass a, RegisterClass b) { return (a > b) ? a : b; }
void MergeValue(RegisterClass *classes, size_t offset, Obj *type) {
Type *t = Ty->Get(type)->type;
int entry = offset / 8;
if (t->isVectorTy()) // we don't handle structures with vectors in them yet
classes[entry] = C_MEMORY;
else if (t->isFloatTy())
classes[entry] = Meet(classes[entry], C_SSE_FLOAT);
else if (t->isDoubleTy())
classes[entry] = Meet(classes[entry], C_SSE_DOUBLE);
else if (t->isIntegerTy() || t->isPointerTy())
classes[entry] = Meet(classes[entry], C_INTEGER);
else if (t->isStructTy()) {
StructType *st = cast<StructType>(Ty->Get(type)->type);
assert(!st->isOpaque());
const StructLayout *sl = CU->getDataLayout().getStructLayout(st);
Obj layout;
GetStructEntries(type, &layout);
int N = layout.size();
for (int i = 0; i < N; i++) {
Obj entry;
layout.objAt(i, &entry);
int allocation = entry.number("allocation");
size_t structoffset = sl->getElementOffset(allocation);
Obj entrytype;
entry.obj("type", &entrytype);
MergeValue(classes, offset + structoffset, &entrytype);
}
} else if (t->isArrayTy()) {
ArrayType *at = cast<ArrayType>(Ty->Get(type)->type);
size_t elemsize = CU->getDataLayout().getTypeAllocSize(at->getElementType());
size_t sz = at->getNumElements();
Obj elemtype;
type->obj("type", &elemtype);
for (size_t i = 0; i < sz; i++)
MergeValue(classes, offset + i * elemsize, &elemtype);
} else
assert(!"unexpected value in classification");
}
#ifndef _WIN32
Type *TypeForClass(size_t size, RegisterClass clz) {
switch (clz) {
case C_SSE_FLOAT:
case C_SSE_DOUBLE:
switch (size) {
case 4:
return Type::getFloatTy(*CU->TT->ctx);
case 8:
return (C_SSE_DOUBLE == clz)
? Type::getDoubleTy(*CU->TT->ctx)
: VectorType::get(Type::getFloatTy(*CU->TT->ctx),
2, false);
default:
assert(!"unexpected size for floating point class");
}
case C_INTEGER:
assert(size <= 8);
return Type::getIntNTy(*CU->TT->ctx, size * 8);
default:
assert(!"unexpected class");
}
}
bool ValidAggregateSize(size_t sz) { return sz <= 16; }
#else
Type *TypeForClass(size_t size, RegisterClass clz) {
assert(size <= 8);
return Type::getIntNTy(*CU->TT->ctx, size * 8);
}
bool ValidAggregateSize(size_t sz) {
bool isPow2 = sz && !(sz & (sz - 1));
return sz <= 8 && isPow2;
}
#endif
void CountValuesPPC64(Type *t, bool &all_float, bool &all_double, int &n_elts,
int64_t &align) {
StructType *st = dyn_cast<StructType>(t);
if (st) {
for (auto elt : st->elements()) {
CountValuesPPC64(elt, all_float, all_double, n_elts, align);
}
return;
}
ArrayType *at = dyn_cast<ArrayType>(t);
if (at) {
Type *elt = at->getElementType();
uint64_t sz = at->getNumElements();
for (uint64_t i = 0; i < sz; ++i) {
CountValuesPPC64(elt, all_float, all_double, n_elts, align);
}
return;