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Separate out the ABI for wasm32 from 386

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gingerBill
2021-10-31 15:23:39 +00:00
parent 3224d04df8
commit 32506a34ff
1 changed files with 65 additions and 1 deletions
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66
src/llvm_abi.cpp
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@@ -1039,6 +1039,70 @@ namespace lbAbiArm64 {
}
}
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 && 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);
}
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, 32), nullptr, nullptr);
case 2: return lb_arg_type_direct(return_type, LLVMIntTypeInContext(c, 32), 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) {
@@ -1075,7 +1139,7 @@ LB_ABI_INFO(lb_get_abi_info) {
case TargetArch_wasm32:
// TODO(bill): implement wasm32's ABI correct
// NOTE(bill): this ABI is only an issue for WASI compatibility
return lbAbi386::abi_info(c, arg_types, arg_count, return_type, return_is_defined, calling_convention);
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