forked from M-Labs/nac3
core/codegen: Implement support for va_info on supported architectures
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@ -609,6 +609,40 @@ fn need_sret(ty: BasicTypeEnum) -> bool {
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need_sret_impl(ty, true)
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}
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/// Returns the [`BasicTypeEnum`] representing a `va_list` struct for variadic arguments.
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fn get_llvm_valist_type<'ctx>(ctx: &'ctx Context, triple: &TargetTriple) -> BasicTypeEnum<'ctx> {
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let triple = TargetMachine::normalize_triple(triple);
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let triple = triple.as_str().to_str().unwrap();
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let arch = triple.split('-').next().unwrap();
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let llvm_pi8 = ctx.i8_type().ptr_type(AddressSpace::default());
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// Referenced from parseArch() in llvm/lib/Support/Triple.cpp
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match arch {
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"i386" | "i486" | "i586" | "i686" | "riscv32" => {
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ctx.i8_type().ptr_type(AddressSpace::default()).into()
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}
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"amd64" | "x86_64" | "x86_64h" => {
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let llvm_i32 = ctx.i32_type();
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let va_list_tag = ctx.opaque_struct_type("struct.__va_list_tag");
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va_list_tag.set_body(
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&[llvm_i32.into(), llvm_i32.into(), llvm_pi8.into(), llvm_pi8.into()],
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false,
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);
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va_list_tag.into()
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}
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"armv7" => {
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let va_list = ctx.opaque_struct_type("struct.__va_list");
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va_list.set_body(&[llvm_pi8.into()], false);
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va_list.into()
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}
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triple => {
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todo!("Unsupported platform for varargs: {triple}")
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}
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}
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}
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/// Implementation for generating LLVM IR for a function.
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pub fn gen_func_impl<
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'ctx,
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