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Improve SysV ABI LLVM IR generation for development purposes

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This commit is contained in:
gingerBill
2022-10-30 22:50:24 +00:00
parent 6a14c3edb4
commit 83f3ae14d5
1 changed files with 26 additions and 1 deletions
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27
src/llvm_abi.cpp
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@@ -537,6 +537,22 @@ namespace lbAbiAmd64SysV {
return false;
}
bool is_llvm_type_slice_like(LLVMTypeRef type) {
if (!lb_is_type_kind(type, LLVMStructTypeKind)) {
return false;
}
if (LLVMCountStructElementTypes(type) != 2) {
return false;
}
LLVMTypeRef fields[2] = {};
LLVMGetStructElementTypes(type, fields);
if (!lb_is_type_kind(fields[0], LLVMPointerTypeKind)) {
return false;
}
return lb_is_type_kind(fields[1], LLVMIntegerTypeKind) && lb_sizeof(fields[1]) == 8;
}
lbArgType amd64_type(LLVMContextRef c, LLVMTypeRef type, Amd64TypeAttributeKind attribute_kind, ProcCallingConvention calling_convention) {
if (is_register(type)) {
LLVMAttributeRef attribute = nullptr;
@@ -559,7 +575,16 @@ namespace lbAbiAmd64SysV {
}
return lb_arg_type_indirect(type, attribute);
} else {
return lb_arg_type_direct(type, llreg(c, cls), nullptr, nullptr);
LLVMTypeRef reg_type = nullptr;
if (is_llvm_type_slice_like(type)) {
// NOTE(bill): This is to make the ABI look closer to what the
// original code is just for slices/strings whilst still adhering
// the ABI rules for SysV
reg_type = type;
} else {
reg_type = llreg(c, cls);
}
return lb_arg_type_direct(type, reg_type, nullptr, nullptr);
}
}