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Odin/src/llvm_abi.cpp

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enum lbArgKind {
lbArg_Direct,
lbArg_Indirect,
lbArg_Ignore,
};
struct lbArgType {
lbArgKind kind;
LLVMTypeRef type;
LLVMTypeRef cast_type; // Optional
LLVMTypeRef pad_type; // Optional
LLVMAttributeRef attribute; // Optional
LLVMAttributeRef align_attribute; // Optional
i64 byval_alignment;
bool is_byval;
};
i64 lb_sizeof(LLVMTypeRef type);
i64 lb_alignof(LLVMTypeRef type);
lbArgType lb_arg_type_direct(LLVMTypeRef type, LLVMTypeRef cast_type, LLVMTypeRef pad_type, LLVMAttributeRef attr) {
return lbArgType{lbArg_Direct, type, cast_type, pad_type, attr, nullptr, 0, false};
}
lbArgType lb_arg_type_direct(LLVMTypeRef type) {
return lb_arg_type_direct(type, nullptr, nullptr, nullptr);
}
lbArgType lb_arg_type_indirect(LLVMTypeRef type, LLVMAttributeRef attr) {
return lbArgType{lbArg_Indirect, type, nullptr, nullptr, attr, nullptr, 0, false};
}
lbArgType lb_arg_type_indirect_byval(LLVMContextRef c, LLVMTypeRef type) {
i64 alignment = lb_alignof(type);
alignment = gb_max(alignment, 8);
LLVMAttributeRef byval_attr = lb_create_enum_attribute_with_type(c, "byval", type);
LLVMAttributeRef align_attr = lb_create_enum_attribute(c, "align", alignment);
return lbArgType{lbArg_Indirect, type, nullptr, nullptr, byval_attr, align_attr, alignment, true};
}
lbArgType lb_arg_type_ignore(LLVMTypeRef type) {
return lbArgType{lbArg_Ignore, type, nullptr, nullptr, nullptr, nullptr, 0, false};
}
struct lbFunctionType {
LLVMContextRef ctx;
ProcCallingConvention calling_convention;
Array<lbArgType> args;
lbArgType ret;
};
i64 llvm_align_formula(i64 off, i64 a) {
return (off + a - 1) / a * a;
}
bool lb_is_type_kind(LLVMTypeRef type, LLVMTypeKind kind) {
if (type == nullptr) {
return false;
}
return LLVMGetTypeKind(type) == kind;
}
LLVMTypeRef lb_function_type_to_llvm_ptr(lbFunctionType *ft, bool is_var_arg) {
unsigned arg_count = cast(unsigned)ft->args.count;
unsigned offset = 0;
LLVMTypeRef ret = nullptr;
if (ft->ret.kind == lbArg_Direct) {
if (ft->ret.cast_type != nullptr) {
ret = ft->ret.cast_type;
} else {
ret = ft->ret.type;
}
} else if (ft->ret.kind == lbArg_Indirect) {
offset += 1;
ret = LLVMVoidTypeInContext(ft->ctx);
} else if (ft->ret.kind == lbArg_Ignore) {
ret = LLVMVoidTypeInContext(ft->ctx);
}
GB_ASSERT_MSG(ret != nullptr, "%d", ft->ret.kind);
unsigned maximum_arg_count = offset+arg_count;
LLVMTypeRef *args = gb_alloc_array(permanent_allocator(), LLVMTypeRef, maximum_arg_count);
if (offset == 1) {
GB_ASSERT(ft->ret.kind == lbArg_Indirect);
args[0] = LLVMPointerType(ft->ret.type, 0);
}
unsigned arg_index = offset;
for (unsigned i = 0; i < arg_count; i++) {
lbArgType *arg = &ft->args[i];
if (arg->kind == lbArg_Direct) {
LLVMTypeRef arg_type = nullptr;
if (ft->args[i].cast_type != nullptr) {
arg_type = arg->cast_type;
} else {
arg_type = arg->type;
}
args[arg_index++] = arg_type;
} else if (arg->kind == lbArg_Indirect) {
GB_ASSERT(!lb_is_type_kind(arg->type, LLVMPointerTypeKind));
args[arg_index++] = LLVMPointerType(arg->type, 0);
} else if (arg->kind == lbArg_Ignore) {
// ignore
}
}
unsigned total_arg_count = arg_index;
LLVMTypeRef func_type = LLVMFunctionType(ret, args, total_arg_count, is_var_arg);
return LLVMPointerType(func_type, 0);
}
void lb_add_function_type_attributes(LLVMValueRef fn, lbFunctionType *ft, ProcCallingConvention calling_convention) {
if (ft == nullptr) {
return;
}
unsigned arg_count = cast(unsigned)ft->args.count;
unsigned offset = 0;
if (ft->ret.kind == lbArg_Indirect) {
offset += 1;
}
LLVMContextRef c = ft->ctx;
LLVMAttributeRef noalias_attr = lb_create_enum_attribute(c, "noalias");
LLVMAttributeRef nonnull_attr = lb_create_enum_attribute(c, "nonnull");
LLVMAttributeRef nocapture_attr = lb_create_enum_attribute(c, "nocapture");
unsigned arg_index = offset;
for (unsigned i = 0; i < arg_count; i++) {
lbArgType *arg = &ft->args[i];
if (arg->kind == lbArg_Ignore) {
continue;
}
if (arg->attribute) {
LLVMAddAttributeAtIndex(fn, arg_index+1, arg->attribute);
}
if (arg->align_attribute) {
LLVMAddAttributeAtIndex(fn, arg_index+1, arg->align_attribute);
}
arg_index++;
}
if (offset != 0 && ft->ret.kind == lbArg_Indirect && ft->ret.attribute != nullptr) {
LLVMAddAttributeAtIndex(fn, offset, ft->ret.attribute);
LLVMAddAttributeAtIndex(fn, offset, noalias_attr);
}
lbCallingConventionKind cc_kind = lbCallingConvention_C;
// TODO(bill): Clean up this logic
if (!is_arch_wasm()) {
cc_kind = lb_calling_convention_map[calling_convention];
}
// if (build_context.metrics.arch == TargetArch_amd64) {
// if (build_context.metrics.os == TargetOs_windows) {
// if (cc_kind == lbCallingConvention_C) {
// cc_kind = lbCallingConvention_Win64;
// }
// } else {
// if (cc_kind == lbCallingConvention_C) {
// cc_kind = lbCallingConvention_X86_64_SysV;
// }
// }
// }
LLVMSetFunctionCallConv(fn, cc_kind);
if (calling_convention == ProcCC_Odin) {
unsigned context_index = offset+arg_count;
LLVMAddAttributeAtIndex(fn, context_index, noalias_attr);
LLVMAddAttributeAtIndex(fn, context_index, nonnull_attr);
LLVMAddAttributeAtIndex(fn, context_index, nocapture_attr);
}
}
i64 lb_sizeof(LLVMTypeRef type) {
LLVMTypeKind kind = LLVMGetTypeKind(type);
switch (kind) {
case LLVMVoidTypeKind:
return 0;
case LLVMIntegerTypeKind:
{
unsigned w = LLVMGetIntTypeWidth(type);
return (w + 7)/8;
}
case LLVMHalfTypeKind:
return 2;
case LLVMFloatTypeKind:
return 4;
case LLVMDoubleTypeKind:
return 8;
case LLVMPointerTypeKind:
return build_context.word_size;
case LLVMStructTypeKind:
{
unsigned field_count = LLVMCountStructElementTypes(type);
i64 offset = 0;
if (LLVMIsPackedStruct(type)) {
for (unsigned i = 0; i < field_count; i++) {
LLVMTypeRef field = LLVMStructGetTypeAtIndex(type, i);
offset += lb_sizeof(field);
}
} else {
for (unsigned i = 0; i < field_count; i++) {
LLVMTypeRef field = LLVMStructGetTypeAtIndex(type, i);
i64 align = lb_alignof(field);
offset = llvm_align_formula(offset, align);
offset += lb_sizeof(field);
}
offset = llvm_align_formula(offset, lb_alignof(type));
}
return offset;
}
break;
case LLVMArrayTypeKind:
{
LLVMTypeRef elem = LLVMGetElementType(type);
i64 elem_size = lb_sizeof(elem);
i64 count = LLVMGetArrayLength(type);
i64 size = count * elem_size;
return size;
}
break;
case LLVMX86_MMXTypeKind:
return 8;
case LLVMVectorTypeKind:
{
LLVMTypeRef elem = LLVMGetElementType(type);
i64 elem_size = lb_sizeof(elem);
i64 count = LLVMGetVectorSize(type);
i64 size = count * elem_size;
return gb_clamp(next_pow2(size), 1, build_context.max_align);
}
}
GB_PANIC("Unhandled type for lb_sizeof -> %s", LLVMPrintTypeToString(type));
return 0;
}
i64 lb_alignof(LLVMTypeRef type) {
LLVMTypeKind kind = LLVMGetTypeKind(type);
switch (kind) {
case LLVMVoidTypeKind:
return 1;
case LLVMIntegerTypeKind:
{
unsigned w = LLVMGetIntTypeWidth(type);
return gb_clamp((w + 7)/8, 1, build_context.word_size);
}
case LLVMHalfTypeKind:
return 2;
case LLVMFloatTypeKind:
return 4;
case LLVMDoubleTypeKind:
return 8;
case LLVMPointerTypeKind:
return build_context.word_size;
case LLVMStructTypeKind:
{
if (LLVMIsPackedStruct(type)) {
return 1;
} else {
unsigned field_count = LLVMCountStructElementTypes(type);
i64 max_align = 1;
for (unsigned i = 0; i < field_count; i++) {
LLVMTypeRef field = LLVMStructGetTypeAtIndex(type, i);
i64 field_align = lb_alignof(field);
max_align = gb_max(max_align, field_align);
}
return max_align;
}
}
break;
case LLVMArrayTypeKind:
return lb_alignof(LLVMGetElementType(type));
case LLVMX86_MMXTypeKind:
return 8;
case LLVMVectorTypeKind:
{
// TODO(bill): This appears to be correct but LLVM isn't necessarily "great" with regards to documentation
LLVMTypeRef elem = LLVMGetElementType(type);
i64 elem_size = lb_sizeof(elem);
i64 count = LLVMGetVectorSize(type);
i64 size = count * elem_size;
return gb_clamp(next_pow2(size), 1, build_context.max_align);
}
}
GB_PANIC("Unhandled type for lb_sizeof -> %s", LLVMPrintTypeToString(type));
// LLVMValueRef v = LLVMAlignOf(type);
// GB_ASSERT(LLVMIsConstant(v));
// return LLVMConstIntGetSExtValue(v);
return 1;
}
#define LB_ABI_INFO(name) lbFunctionType *name(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count, LLVMTypeRef return_type, bool return_is_defined, ProcCallingConvention calling_convention)
typedef LB_ABI_INFO(lbAbiInfoType);
// NOTE(bill): I hate `namespace` in C++ but this is just because I don't want to prefix everything
namespace lbAbi386 {
Array<lbArgType> compute_arg_types(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count);
lbArgType compute_return_type(LLVMContextRef c, LLVMTypeRef return_type, bool return_is_defined);
LB_ABI_INFO(abi_info) {
lbFunctionType *ft = gb_alloc_item(permanent_allocator(), lbFunctionType);
ft->ctx = c;
ft->args = compute_arg_types(c, arg_types, arg_count);
ft->ret = compute_return_type(c, return_type, return_is_defined);
ft->calling_convention = calling_convention;
return ft;
}
lbArgType non_struct(LLVMContextRef c, LLVMTypeRef type, bool is_return) {
if (!is_return && lb_sizeof(type) > 8) {
return lb_arg_type_indirect(type, nullptr);
}
if (build_context.metrics.os == TargetOs_windows &&
build_context.word_size == 8 &&
lb_is_type_kind(type, LLVMIntegerTypeKind) &&
type == LLVMIntTypeInContext(c, 128)) {
// NOTE(bill): Because Windows AMD64 is weird
// TODO(bill): LLVM is probably bugged here and doesn't correctly generate the right code
// So even though it is "technically" wrong, no cast might be the best option
LLVMTypeRef cast_type = nullptr;
if (true || !is_return) {
cast_type = LLVMVectorType(LLVMInt64TypeInContext(c), 2);
}
return lb_arg_type_direct(type, cast_type, nullptr, nullptr);
}
LLVMAttributeRef attr = nullptr;
LLVMTypeRef i1 = LLVMInt1TypeInContext(c);
if (type == i1) {
attr = lb_create_enum_attribute(c, "zeroext");
}
return lb_arg_type_direct(type, nullptr, nullptr, attr);
}
Array<lbArgType> compute_arg_types(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count) {
auto args = array_make<lbArgType>(heap_allocator(), arg_count);
for (unsigned i = 0; i < arg_count; i++) {
LLVMTypeRef t = arg_types[i];
LLVMTypeKind kind = LLVMGetTypeKind(t);
i64 sz = lb_sizeof(t);
if (kind == LLVMStructTypeKind || kind == LLVMArrayTypeKind) {
if (sz == 0) {
args[i] = lb_arg_type_ignore(t);
} else {
args[i] = lb_arg_type_indirect(t, nullptr);
}
} else {
args[i] = non_struct(c, t, false);
}
}
return args;
}
lbArgType compute_return_type(LLVMContextRef c, LLVMTypeRef return_type, bool return_is_defined) {
if (!return_is_defined) {
return lb_arg_type_direct(LLVMVoidTypeInContext(c));
} else if (lb_is_type_kind(return_type, LLVMStructTypeKind) || lb_is_type_kind(return_type, LLVMArrayTypeKind)) {
i64 sz = lb_sizeof(return_type);
switch (sz) {
case 1: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 8), nullptr, nullptr);
case 2: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 16), nullptr, nullptr);
case 4: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 32), nullptr, nullptr);
case 8: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 64), nullptr, nullptr);
}
LLVMAttributeRef attr = lb_create_enum_attribute_with_type(c, "sret", return_type);
return lb_arg_type_indirect(return_type, attr);
}
return non_struct(c, return_type, true);
}
};
namespace lbAbiAmd64Win64 {
Array<lbArgType> compute_arg_types(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count);
LB_ABI_INFO(abi_info) {
lbFunctionType *ft = gb_alloc_item(permanent_allocator(), lbFunctionType);
ft->ctx = c;
ft->args = compute_arg_types(c, arg_types, arg_count);
ft->ret = lbAbi386::compute_return_type(c, return_type, return_is_defined);
ft->calling_convention = calling_convention;
return ft;
}
Array<lbArgType> compute_arg_types(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count) {
auto args = array_make<lbArgType>(heap_allocator(), arg_count);
for (unsigned i = 0; i < arg_count; i++) {
LLVMTypeRef t = arg_types[i];
LLVMTypeKind kind = LLVMGetTypeKind(t);
if (kind == LLVMStructTypeKind || kind == LLVMArrayTypeKind) {
i64 sz = lb_sizeof(t);
switch (sz) {
case 1:
case 2:
case 4:
case 8:
args[i] = lb_arg_type_direct(t, LLVMIntTypeInContext(c, 8*cast(unsigned)sz), nullptr, nullptr);
break;
default:
args[i] = lb_arg_type_indirect(t, nullptr);
break;
}
} else {
args[i] = lbAbi386::non_struct(c, t, false);
}
}
return args;
}
};
// NOTE(bill): I hate `namespace` in C++ but this is just because I don't want to prefix everything
namespace lbAbiAmd64SysV {
enum RegClass {
RegClass_NoClass,
RegClass_Int,
RegClass_SSEFs,
RegClass_SSEFv,
RegClass_SSEDs,
RegClass_SSEDv,
RegClass_SSEInt8,
RegClass_SSEInt16,
RegClass_SSEInt32,
RegClass_SSEInt64,
RegClass_SSEUp,
RegClass_X87,
RegClass_X87Up,
RegClass_ComplexX87,
RegClass_Memory,
};
bool is_sse(RegClass reg_class) {
switch (reg_class) {
case RegClass_SSEFs:
case RegClass_SSEFv:
case RegClass_SSEDs:
case RegClass_SSEDv:
return true;
case RegClass_SSEInt8:
case RegClass_SSEInt16:
case RegClass_SSEInt32:
case RegClass_SSEInt64:
return true;
}
return false;
}
void all_mem(Array<RegClass> *cs) {
for_array(i, *cs) {
(*cs)[i] = RegClass_Memory;
}
}
enum Amd64TypeAttributeKind {
Amd64TypeAttribute_None,
Amd64TypeAttribute_ByVal,
Amd64TypeAttribute_StructRect,
};
lbArgType compute_return_type(LLVMContextRef c, LLVMTypeRef return_type, bool return_is_defined);
void classify_with(LLVMTypeRef t, Array<RegClass> *cls, i64 ix, i64 off);
void fixup(LLVMTypeRef t, Array<RegClass> *cls);
lbArgType amd64_type(LLVMContextRef c, LLVMTypeRef type, Amd64TypeAttributeKind attribute_kind, ProcCallingConvention calling_convention);
Array<RegClass> classify(LLVMTypeRef t);
LLVMTypeRef llreg(LLVMContextRef c, Array<RegClass> const &reg_classes);
LB_ABI_INFO(abi_info) {
lbFunctionType *ft = gb_alloc_item(permanent_allocator(), lbFunctionType);
ft->ctx = c;
ft->calling_convention = calling_convention;
ft->args = array_make<lbArgType>(heap_allocator(), arg_count);
for (unsigned i = 0; i < arg_count; i++) {
ft->args[i] = amd64_type(c, arg_types[i], Amd64TypeAttribute_ByVal, calling_convention);
}
if (return_is_defined) {
ft->ret = amd64_type(c, return_type, Amd64TypeAttribute_StructRect, calling_convention);
} else {
ft->ret = lb_arg_type_direct(LLVMVoidTypeInContext(c));
}
return ft;
}
bool is_mem_cls(Array<RegClass> const &cls, Amd64TypeAttributeKind attribute_kind) {
if (attribute_kind == Amd64TypeAttribute_ByVal) {
if (cls.count == 0) {
return false;
}
auto first = cls[0];
return first == RegClass_Memory || first == RegClass_X87 || first == RegClass_ComplexX87;
} else if (attribute_kind == Amd64TypeAttribute_StructRect) {
if (cls.count == 0) {
return false;
}
return cls[0] == RegClass_Memory;
}
return false;
}
bool is_register(LLVMTypeRef type) {
LLVMTypeKind kind = LLVMGetTypeKind(type);
switch (kind) {
case LLVMIntegerTypeKind:
case LLVMHalfTypeKind:
case LLVMFloatTypeKind:
case LLVMDoubleTypeKind:
case LLVMPointerTypeKind:
return true;
}
return false;
}
lbArgType amd64_type(LLVMContextRef c, LLVMTypeRef type, Amd64TypeAttributeKind attribute_kind, ProcCallingConvention calling_convention) {
if (is_register(type)) {
LLVMAttributeRef attribute = nullptr;
if (type == LLVMInt1TypeInContext(c)) {
attribute = lb_create_enum_attribute(c, "zeroext");
}
return lb_arg_type_direct(type, nullptr, nullptr, attribute);
}
auto cls = classify(type);
if (is_mem_cls(cls, attribute_kind)) {
LLVMAttributeRef attribute = nullptr;
if (attribute_kind == Amd64TypeAttribute_ByVal) {
if (!is_calling_convention_odin(calling_convention)) {
return lb_arg_type_indirect_byval(c, type);
}
attribute = nullptr;
} else if (attribute_kind == Amd64TypeAttribute_StructRect) {
attribute = lb_create_enum_attribute_with_type(c, "sret", type);
}
return lb_arg_type_indirect(type, attribute);
} else {
return lb_arg_type_direct(type, llreg(c, cls), nullptr, nullptr);
}
}
lbArgType non_struct(LLVMContextRef c, LLVMTypeRef type) {
LLVMAttributeRef attr = nullptr;
LLVMTypeRef i1 = LLVMInt1TypeInContext(c);
if (type == i1) {
attr = lb_create_enum_attribute(c, "zeroext");
}
return lb_arg_type_direct(type, nullptr, nullptr, attr);
}
Array<RegClass> classify(LLVMTypeRef t) {
i64 sz = lb_sizeof(t);
i64 words = (sz + 7)/8;
auto reg_classes = array_make<RegClass>(heap_allocator(), cast(isize)words);
if (words > 4) {
all_mem(&reg_classes);
} else {
classify_with(t, &reg_classes, 0, 0);
fixup(t, &reg_classes);
}
return reg_classes;
}
void unify(Array<RegClass> *cls, i64 i, RegClass const newv) {
RegClass const oldv = (*cls)[cast(isize)i];
if (oldv == newv) {
return;
}
RegClass to_write = newv;
if (oldv == RegClass_NoClass) {
to_write = newv;
} else if (newv == RegClass_NoClass) {
return;
} else if (oldv == RegClass_Memory || newv == RegClass_Memory) {
to_write = RegClass_Memory;
} else if (oldv == RegClass_Int || newv == RegClass_Int) {
to_write = RegClass_Int;
} else if (oldv == RegClass_X87 || oldv == RegClass_X87Up || oldv == RegClass_ComplexX87) {
to_write = RegClass_Memory;
} else if (newv == RegClass_X87 || newv == RegClass_X87Up || newv == RegClass_ComplexX87) {
to_write = RegClass_Memory;
} else if (newv == RegClass_SSEUp) {
switch (oldv) {
case RegClass_SSEFv:
case RegClass_SSEFs:
case RegClass_SSEDv:
case RegClass_SSEDs:
case RegClass_SSEInt8:
case RegClass_SSEInt16:
case RegClass_SSEInt32:
case RegClass_SSEInt64:
return;
}
}
(*cls)[cast(isize)i] = to_write;
}
void fixup(LLVMTypeRef t, Array<RegClass> *cls) {
i64 i = 0;
i64 e = cls->count;
if (e > 2 && (lb_is_type_kind(t, LLVMStructTypeKind) ||
lb_is_type_kind(t, LLVMArrayTypeKind) ||
lb_is_type_kind(t, LLVMVectorTypeKind))) {
RegClass &oldv = (*cls)[cast(isize)i];
if (is_sse(oldv)) {
for (i++; i < e; i++) {
if (oldv != RegClass_SSEUp) {
all_mem(cls);
return;
}
}
} else {
all_mem(cls);
return;
}
} else {
while (i < e) {
RegClass &oldv = (*cls)[cast(isize)i];
if (oldv == RegClass_Memory) {
all_mem(cls);
return;
} else if (oldv == RegClass_X87Up) {
// NOTE(bill): Darwin
all_mem(cls);
return;
} else if (oldv == RegClass_SSEUp) {
oldv = RegClass_SSEDv;
} else if (is_sse(oldv)) {
i++;
while (i != e && oldv == RegClass_SSEUp) {
i++;
}
} else if (oldv == RegClass_X87) {
i++;
while (i != e && oldv == RegClass_X87Up) {
i++;
}
} else {
i++;
}
}
}
}
unsigned llvec_len(Array<RegClass> const &reg_classes, isize offset) {
unsigned len = 1;
for (isize i = offset; i < reg_classes.count; i++) {
if (reg_classes[i] != RegClass_SSEUp) {
break;
}
len++;
}
return len;
}
LLVMTypeRef llreg(LLVMContextRef c, Array<RegClass> const &reg_classes) {
auto types = array_make<LLVMTypeRef>(heap_allocator(), 0, reg_classes.count);
for (isize i = 0; i < reg_classes.count; /**/) {
RegClass reg_class = reg_classes[i];
switch (reg_class) {
case RegClass_Int:
array_add(&types, LLVMIntTypeInContext(c, 64));
break;
case RegClass_SSEFv:
case RegClass_SSEDv:
case RegClass_SSEInt8:
case RegClass_SSEInt16:
case RegClass_SSEInt32:
case RegClass_SSEInt64:
{
unsigned elems_per_word = 0;
LLVMTypeRef elem_type = nullptr;
switch (reg_class) {
case RegClass_SSEFv:
elems_per_word = 2;
elem_type = LLVMFloatTypeInContext(c);
break;
case RegClass_SSEDv:
elems_per_word = 1;
elem_type = LLVMDoubleTypeInContext(c);
break;
case RegClass_SSEInt8:
elems_per_word = 64/8;
elem_type = LLVMIntTypeInContext(c, 8);
break;
case RegClass_SSEInt16:
elems_per_word = 64/16;
elem_type = LLVMIntTypeInContext(c, 16);
break;
case RegClass_SSEInt32:
elems_per_word = 64/32;
elem_type = LLVMIntTypeInContext(c, 32);
break;
case RegClass_SSEInt64:
elems_per_word = 64/64;
elem_type = LLVMIntTypeInContext(c, 64);
break;
}
unsigned vec_len = llvec_len(reg_classes, i+1);
LLVMTypeRef vec_type = LLVMVectorType(elem_type, vec_len * elems_per_word);
array_add(&types, vec_type);
i += vec_len;
continue;
}
break;
case RegClass_SSEFs:
array_add(&types, LLVMFloatTypeInContext(c));
break;
case RegClass_SSEDs:
array_add(&types, LLVMDoubleTypeInContext(c));
break;
default:
GB_PANIC("Unhandled RegClass");
}
i += 1;
}
if (types.count == 1) {
return types[0];
}
return LLVMStructTypeInContext(c, types.data, cast(unsigned)types.count, false);
}
void classify_with(LLVMTypeRef t, Array<RegClass> *cls, i64 ix, i64 off) {
i64 t_align = lb_alignof(t);
i64 t_size = lb_sizeof(t);
i64 misalign = off % t_align;
if (misalign != 0) {
i64 e = (off + t_size + 7) / 8;
for (i64 i = off / 8; i < e; i++) {
unify(cls, ix+i, RegClass_Memory);
}
return;
}
switch (LLVMGetTypeKind(t)) {
case LLVMIntegerTypeKind:
case LLVMPointerTypeKind:
case LLVMHalfTypeKind:
unify(cls, ix + off/8, RegClass_Int);
break;
case LLVMFloatTypeKind:
unify(cls, ix + off/8, (off%8 == 4) ? RegClass_SSEFv : RegClass_SSEFs);
break;
case LLVMDoubleTypeKind:
unify(cls, ix + off/8, RegClass_SSEDs);
break;
case LLVMStructTypeKind:
{
LLVMBool packed = LLVMIsPackedStruct(t);
unsigned field_count = LLVMCountStructElementTypes(t);
i64 field_off = off;
for (unsigned field_index = 0; field_index < field_count; field_index++) {
LLVMTypeRef field_type = LLVMStructGetTypeAtIndex(t, field_index);
if (!packed) {
field_off = llvm_align_formula(field_off, lb_alignof(field_type));
}
classify_with(field_type, cls, ix, field_off);
field_off += lb_sizeof(field_type);
}
}
break;
case LLVMArrayTypeKind:
{
i64 len = LLVMGetArrayLength(t);
LLVMTypeRef elem = LLVMGetElementType(t);
i64 elem_sz = lb_sizeof(elem);
for (i64 i = 0; i < len; i++) {
classify_with(elem, cls, ix, off + i*elem_sz);
}
}
break;
case LLVMVectorTypeKind:
{
i64 len = LLVMGetVectorSize(t);
LLVMTypeRef elem = LLVMGetElementType(t);
i64 elem_sz = lb_sizeof(elem);
LLVMTypeKind elem_kind = LLVMGetTypeKind(elem);
RegClass reg = RegClass_NoClass;
switch (elem_kind) {
case LLVMIntegerTypeKind:
case LLVMHalfTypeKind:
switch (LLVMGetIntTypeWidth(elem)) {
case 8: reg = RegClass_SSEInt8;
case 16: reg = RegClass_SSEInt16;
case 32: reg = RegClass_SSEInt32;
case 64: reg = RegClass_SSEInt64;
default:
GB_PANIC("Unhandled integer width for vector type");
}
break;
case LLVMFloatTypeKind:
reg = RegClass_SSEFv;
break;
case LLVMDoubleTypeKind:
reg = RegClass_SSEDv;
break;
default:
GB_PANIC("Unhandled vector element type");
}
for (i64 i = 0; i < len; i++) {
unify(cls, ix + (off + i*elem_sz)/8, reg);
// NOTE(bill): Everything after the first one is the upper
// half of a register
reg = RegClass_SSEUp;
}
}
break;
default:
GB_PANIC("Unhandled type");
break;
}
}
lbArgType compute_return_type(LLVMContextRef c, LLVMTypeRef return_type, bool return_is_defined) {
if (!return_is_defined) {
return lb_arg_type_direct(LLVMVoidTypeInContext(c));
} else if (lb_is_type_kind(return_type, LLVMStructTypeKind)) {
i64 sz = lb_sizeof(return_type);
switch (sz) {
case 1: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 8), nullptr, nullptr);
case 2: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 16), nullptr, nullptr);
case 4: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 32), nullptr, nullptr);
case 8: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 64), nullptr, nullptr);
}
LLVMAttributeRef attr = lb_create_enum_attribute_with_type(c, "sret", return_type);
return lb_arg_type_indirect(return_type, attr);
} else if (build_context.metrics.os == TargetOs_windows && lb_is_type_kind(return_type, LLVMIntegerTypeKind) && lb_sizeof(return_type) == 16) {
return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 128), nullptr, nullptr);
}
return non_struct(c, return_type);
}
};
namespace lbAbiArm64 {
Array<lbArgType> compute_arg_types(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count);
lbArgType compute_return_type(LLVMContextRef c, LLVMTypeRef return_type, bool return_is_defined);
bool is_homogenous_aggregate(LLVMContextRef c, LLVMTypeRef type, LLVMTypeRef *base_type_, unsigned *member_count_);
LB_ABI_INFO(abi_info) {
lbFunctionType *ft = gb_alloc_item(permanent_allocator(), lbFunctionType);
ft->ctx = c;
ft->ret = compute_return_type(c, return_type, return_is_defined);
ft -> args = compute_arg_types(c, arg_types, arg_count);
ft->calling_convention = calling_convention;
return ft;
}
bool is_register(LLVMTypeRef type) {
LLVMTypeKind kind = LLVMGetTypeKind(type);
switch (kind) {
case LLVMIntegerTypeKind:
case LLVMHalfTypeKind:
case LLVMFloatTypeKind:
case LLVMDoubleTypeKind:
case LLVMPointerTypeKind:
return true;
}
return false;
}
lbArgType non_struct(LLVMContextRef c, LLVMTypeRef type) {
LLVMAttributeRef attr = nullptr;
LLVMTypeRef i1 = LLVMInt1TypeInContext(c);
if (type == i1) {
attr = lb_create_enum_attribute(c, "zeroext");
}
return lb_arg_type_direct(type, nullptr, nullptr, attr);
}
bool is_homogenous_array(LLVMContextRef c, LLVMTypeRef type, LLVMTypeRef *base_type_, unsigned *member_count_) {
GB_ASSERT(lb_is_type_kind(type, LLVMArrayTypeKind));
unsigned len = LLVMGetArrayLength(type);
if (len == 0) {
return false;
}
LLVMTypeRef elem = LLVMGetElementType(type);
LLVMTypeRef base_type = nullptr;
unsigned member_count = 0;
if (is_homogenous_aggregate(c, elem, &base_type, &member_count)) {
if (base_type_) *base_type_ = base_type;
if (member_count_) *member_count_ = member_count * len;
return true;
}
return false;
}
bool is_homogenous_struct(LLVMContextRef c, LLVMTypeRef type, LLVMTypeRef *base_type_, unsigned *member_count_) {
GB_ASSERT(lb_is_type_kind(type, LLVMStructTypeKind));
unsigned elem_count = LLVMCountStructElementTypes(type);
if (elem_count == 0) {
return false;
}
LLVMTypeRef base_type = nullptr;
unsigned member_count = 0;
for (unsigned i = 0; i < elem_count; i++) {
LLVMTypeRef field_type = nullptr;
unsigned field_member_count = 0;
LLVMTypeRef elem = LLVMStructGetTypeAtIndex(type, i);
if (!is_homogenous_aggregate(c, elem, &field_type, &field_member_count)) {
return false;
}
if (base_type == nullptr) {
base_type = field_type;
member_count = field_member_count;
} else {
if (base_type != field_type) {
return false;
}
member_count += field_member_count;
}
}
if (base_type == nullptr) {
return false;
}
if (lb_sizeof(type) == lb_sizeof(base_type) * member_count) {
if (base_type_) *base_type_ = base_type;
if (member_count_) *member_count_ = member_count;
return true;
}
return false;
}
bool is_homogenous_aggregate(LLVMContextRef c, LLVMTypeRef type, LLVMTypeRef *base_type_, unsigned *member_count_) {
LLVMTypeKind kind = LLVMGetTypeKind(type);
switch (kind) {
case LLVMFloatTypeKind:
case LLVMDoubleTypeKind:
if (base_type_) *base_type_ = type;
if (member_count_) *member_count_ = 1;
return true;
case LLVMArrayTypeKind:
return is_homogenous_array(c, type, base_type_, member_count_);
case LLVMStructTypeKind:
return is_homogenous_struct(c, type, base_type_, member_count_);
}
return false;
}
unsigned is_homogenous_aggregate_small_enough(LLVMTypeRef *base_type_, unsigned member_count_) {
return (member_count_ <= 4);
}
lbArgType compute_return_type(LLVMContextRef c, LLVMTypeRef type, bool return_is_defined) {
LLVMTypeRef homo_base_type = {};
unsigned homo_member_count = 0;
if (!return_is_defined) {
return lb_arg_type_direct(LLVMVoidTypeInContext(c));
} else if (is_register(type)) {
return non_struct(c, type);
} else if (is_homogenous_aggregate(c, type, &homo_base_type, &homo_member_count)) {
if(is_homogenous_aggregate_small_enough(&homo_base_type, homo_member_count)) {
return lb_arg_type_direct(type, LLVMArrayType(homo_base_type, homo_member_count), nullptr, nullptr);
} else {
//TODO(Platin): do i need to create stuff that can handle the diffrent return type?
// else this needs a fix in llvm_backend_proc as we would need to cast it to the correct array type
//LLVMTypeRef array_type = LLVMArrayType(homo_base_type, homo_member_count);
LLVMAttributeRef attr = lb_create_enum_attribute_with_type(c, "sret", type);
return lb_arg_type_indirect(type, attr);
}
} else {
i64 size = lb_sizeof(type);
if (size <= 16) {
LLVMTypeRef cast_type = nullptr;
if (size <= 1) {
cast_type = LLVMInt8TypeInContext(c);
} else if (size <= 2) {
cast_type = LLVMInt16TypeInContext(c);
} else if (size <= 4) {
cast_type = LLVMInt32TypeInContext(c);
} else if (size <= 8) {
cast_type = LLVMInt64TypeInContext(c);
} else {
unsigned count = cast(unsigned)((size+7)/8);
cast_type = LLVMArrayType(LLVMInt64TypeInContext(c), count);
}
return lb_arg_type_direct(type, cast_type, nullptr, nullptr);
} else {
LLVMAttributeRef attr = lb_create_enum_attribute_with_type(c, "sret", type);
return lb_arg_type_indirect(type, attr);
}
}
}
Array<lbArgType> compute_arg_types(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count) {
auto args = array_make<lbArgType>(heap_allocator(), arg_count);
for (unsigned i = 0; i < arg_count; i++) {
LLVMTypeRef type = arg_types[i];
LLVMTypeRef homo_base_type = {};
unsigned homo_member_count = 0;
if (is_register(type)) {
args[i] = non_struct(c, type);
} else if (is_homogenous_aggregate(c, type, &homo_base_type, &homo_member_count)) {
args[i] = lb_arg_type_direct(type, LLVMArrayType(homo_base_type, homo_member_count), nullptr, nullptr);
} else {
i64 size = lb_sizeof(type);
if (size <= 16) {
LLVMTypeRef cast_type = nullptr;
if (size <= 1) {
cast_type = LLVMIntTypeInContext(c, 8);
} else if (size <= 2) {
cast_type = LLVMIntTypeInContext(c, 16);
} else if (size <= 4) {
cast_type = LLVMIntTypeInContext(c, 32);
} else if (size <= 8) {
cast_type = LLVMIntTypeInContext(c, 64);
} else {
unsigned count = cast(unsigned)((size+7)/8);
cast_type = LLVMArrayType(LLVMIntTypeInContext(c, 64), count);
}
args[i] = lb_arg_type_direct(type, cast_type, nullptr, nullptr);
} else {
args[i] = lb_arg_type_indirect(type, nullptr);
}
}
}
return args;
}
}
namespace lbAbiWasm32 {
Array<lbArgType> compute_arg_types(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count);
lbArgType compute_return_type(LLVMContextRef c, LLVMTypeRef return_type, bool return_is_defined);
LB_ABI_INFO(abi_info) {
lbFunctionType *ft = gb_alloc_item(permanent_allocator(), lbFunctionType);
ft->ctx = c;
ft->args = compute_arg_types(c, arg_types, arg_count);
ft->ret = compute_return_type(c, return_type, return_is_defined);
ft->calling_convention = calling_convention;
return ft;
}
lbArgType non_struct(LLVMContextRef c, LLVMTypeRef type, bool is_return) {
if (!is_return && type == LLVMIntTypeInContext(c, 128)) {
LLVMTypeRef cast_type = LLVMVectorType(LLVMInt64TypeInContext(c), 2);
return lb_arg_type_direct(type, cast_type, nullptr, nullptr);
}
if (!is_return && lb_sizeof(type) > 8) {
return lb_arg_type_indirect(type, nullptr);
}
LLVMAttributeRef attr = nullptr;
LLVMTypeRef i1 = LLVMInt1TypeInContext(c);
if (type == i1) {
attr = lb_create_enum_attribute(c, "zeroext");
}
return lb_arg_type_direct(type, nullptr, nullptr, attr);
}
bool is_struct_valid_elem_type(LLVMTypeRef type) {
switch (LLVMGetTypeKind(type)) {
case LLVMHalfTypeKind:
case LLVMFloatTypeKind:
case LLVMDoubleTypeKind:
case LLVMPointerTypeKind:
return true;
case LLVMIntegerTypeKind:
return lb_sizeof(type) <= 8;
}
return false;
}
lbArgType is_struct(LLVMContextRef c, LLVMTypeRef type) {
LLVMTypeKind kind = LLVMGetTypeKind(type);
GB_ASSERT(kind == LLVMArrayTypeKind || kind == LLVMStructTypeKind);
i64 sz = lb_sizeof(type);
if (sz == 0) {
return lb_arg_type_ignore(type);
}
if (sz <= 16) {
if (kind == LLVMArrayTypeKind) {
LLVMTypeRef elem = LLVMGetElementType(type);
if (is_struct_valid_elem_type(elem)) {
return lb_arg_type_direct(type);
}
} else if (kind == LLVMStructTypeKind) {
bool can_be_direct = true;
unsigned count = LLVMCountStructElementTypes(type);
for (unsigned i = 0; i < count; i++) {
LLVMTypeRef elem = LLVMStructGetTypeAtIndex(type, i);
if (!is_struct_valid_elem_type(elem)) {
can_be_direct = false;
break;
}
}
if (can_be_direct) {
return lb_arg_type_direct(type);
}
}
}
return lb_arg_type_indirect(type, nullptr);
}
Array<lbArgType> compute_arg_types(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count) {
auto args = array_make<lbArgType>(heap_allocator(), arg_count);
for (unsigned i = 0; i < arg_count; i++) {
LLVMTypeRef t = arg_types[i];
LLVMTypeKind kind = LLVMGetTypeKind(t);
if (kind == LLVMStructTypeKind || kind == LLVMArrayTypeKind) {
args[i] = is_struct(c, t);
} else {
args[i] = non_struct(c, t, false);
}
}
return args;
}
lbArgType compute_return_type(LLVMContextRef c, LLVMTypeRef return_type, bool return_is_defined) {
if (!return_is_defined) {
return lb_arg_type_direct(LLVMVoidTypeInContext(c));
} else if (lb_is_type_kind(return_type, LLVMStructTypeKind) || lb_is_type_kind(return_type, LLVMArrayTypeKind)) {
i64 sz = lb_sizeof(return_type);
switch (sz) {
case 1: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 8), nullptr, nullptr);
case 2: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 16), nullptr, nullptr);
case 4: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 32), nullptr, nullptr);
case 8: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 64), nullptr, nullptr);
}
LLVMAttributeRef attr = lb_create_enum_attribute_with_type(c, "sret", return_type);
return lb_arg_type_indirect(return_type, attr);
}
return non_struct(c, return_type, true);
}
}
LB_ABI_INFO(lb_get_abi_info) {
switch (calling_convention) {
case ProcCC_None:
case ProcCC_InlineAsm:
{
lbFunctionType *ft = gb_alloc_item(permanent_allocator(), lbFunctionType);
ft->ctx = c;
ft->args = array_make<lbArgType>(heap_allocator(), arg_count);
for (unsigned i = 0; i < arg_count; i++) {
ft->args[i] = lb_arg_type_direct(arg_types[i]);
}
if (return_is_defined) {
ft->ret = lb_arg_type_direct(return_type);
} else {
ft->ret = lb_arg_type_direct(LLVMVoidTypeInContext(c));
}
ft->calling_convention = calling_convention;
return ft;
}
case ProcCC_Win64:
GB_ASSERT(build_context.metrics.arch == TargetArch_amd64);
return lbAbiAmd64Win64::abi_info(c, arg_types, arg_count, return_type, return_is_defined, calling_convention);
case ProcCC_SysV:
GB_ASSERT(build_context.metrics.arch == TargetArch_amd64);
return lbAbiAmd64SysV::abi_info(c, arg_types, arg_count, return_type, return_is_defined, calling_convention);
}
switch (build_context.metrics.arch) {
case TargetArch_amd64:
if (build_context.metrics.os == TargetOs_windows) {
return lbAbiAmd64Win64::abi_info(c, arg_types, arg_count, return_type, return_is_defined, calling_convention);
} else {
return lbAbiAmd64SysV::abi_info(c, arg_types, arg_count, return_type, return_is_defined, calling_convention);
}
case TargetArch_i386:
return lbAbi386::abi_info(c, arg_types, arg_count, return_type, return_is_defined, calling_convention);
case TargetArch_arm64:
return lbAbiArm64::abi_info(c, arg_types, arg_count, return_type, return_is_defined, calling_convention);
case TargetArch_wasm32:
// TODO(bill): implement wasm32's ABI correct
// NOTE(bill): this ABI is only an issue for WASI compatibility
return lbAbiWasm32::abi_info(c, arg_types, arg_count, return_type, return_is_defined, calling_convention);
case TargetArch_wasm64:
// TODO(bill): implement wasm64's ABI correct
// NOTE(bill): this ABI is only an issue for WASI compatibility
return lbAbiAmd64SysV::abi_info(c, arg_types, arg_count, return_type, return_is_defined, calling_convention);
}
GB_PANIC("Unsupported ABI");
return {};
}
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