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Add basic arm32 ABI support (linux_arm32)

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gingerBill
2022-05-01 23:15:06 +01:00
parent 18463d68d4
commit 10a311092b
2 changed files with 102 additions and 1 deletions
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src/llvm_abi.cpp
+88
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@@ -516,6 +516,10 @@ namespace lbAbiAmd64SysV {
bool is_register(LLVMTypeRef type) {
LLVMTypeKind kind = LLVMGetTypeKind(type);
i64 sz = lb_sizeof(type);
if (sz == 0) {
return false;
}
switch (kind) {
case LLVMIntegerTypeKind:
case LLVMHalfTypeKind:
@@ -1164,6 +1168,88 @@ namespace lbAbiWasm32 {
}
}
namespace lbAbiArm32 {
Array<lbArgType> compute_arg_types(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count, ProcCallingConvention calling_convention);
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, calling_convention);
ft->ret = compute_return_type(c, return_type, return_is_defined);
ft->calling_convention = calling_convention;
return ft;
}
bool is_register(LLVMTypeRef type, bool is_return) {
LLVMTypeKind kind = LLVMGetTypeKind(type);
switch (kind) {
case LLVMHalfTypeKind:
case LLVMFloatTypeKind:
case LLVMDoubleTypeKind:
return true;
case LLVMIntegerTypeKind:
return lb_sizeof(type) <= 8;
case LLVMFunctionTypeKind:
return true;
case LLVMPointerTypeKind:
return true;
case LLVMVectorTypeKind:
return true;
}
return false;
}
lbArgType non_struct(LLVMContextRef c, LLVMTypeRef type, bool is_return) {
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, ProcCallingConvention calling_convention) {
auto args = array_make<lbArgType>(heap_allocator(), arg_count);
for (unsigned i = 0; i < arg_count; i++) {
LLVMTypeRef t = arg_types[i];
if (is_register(t, false)) {
args[i] = non_struct(c, t, false);
} else {
i64 sz = lb_sizeof(t);
i64 a = lb_alignof(t);
if (is_calling_convention_odin(calling_convention) && sz > 8) {
// Minor change to improve performance using the Odin calling conventions
args[i] = lb_arg_type_indirect(t, nullptr);
} else if (a <= 4) {
unsigned n = cast(unsigned)((sz + 3) / 4);
args[i] = lb_arg_type_direct(LLVMArrayType(LLVMIntTypeInContext(c, 32), n));
} else {
unsigned n = cast(unsigned)((sz + 7) / 8);
args[i] = lb_arg_type_direct(LLVMArrayType(LLVMIntTypeInContext(c, 64), n));
}
}
}
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 (!is_register(return_type, true)) {
switch (lb_sizeof(return_type)) {
case 1: return lb_arg_type_direct(LLVMIntTypeInContext(c, 8), return_type, nullptr, nullptr);
case 2: return lb_arg_type_direct(LLVMIntTypeInContext(c, 16), return_type, nullptr, nullptr);
case 3: case 4: return lb_arg_type_direct(LLVMIntTypeInContext(c, 32), return_type, 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) {
@@ -1203,6 +1289,8 @@ LB_ABI_INFO(lb_get_abi_info) {
}
case TargetArch_i386:
return lbAbi386::abi_info(c, arg_types, arg_count, return_type, return_is_defined, calling_convention);
case TargetArch_arm32:
return lbAbiArm32::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: