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Code cleanups following up on #65576. #65681

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Oct 23, 2019
Merged

Code cleanups following up on #65576. #65681

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37 changes: 24 additions & 13 deletions src/librustc_codegen_ssa/base.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -406,6 +406,8 @@ pub fn maybe_create_entry_wrapper<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(cx: &'
rust_main_def_id: DefId,
use_start_lang_item: bool,
) {
// The entry function is either `int main(void)` or `int main(int argc, char **argv)`,
// depending on whether the target needs `argc` and `argv` to be passed in.
let llfty = if cx.sess().target.target.options.main_needs_argc_argv {
cx.type_func(&[cx.type_int(), cx.type_ptr_to(cx.type_i8p())], cx.type_int())
} else {
Expand Down Expand Up @@ -440,19 +442,7 @@ pub fn maybe_create_entry_wrapper<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(cx: &'

bx.insert_reference_to_gdb_debug_scripts_section_global();

let (arg_argc, arg_argv) = if cx.sess().target.target.options.main_needs_argc_argv {
// Params from native main() used as args for rust start function
let param_argc = bx.get_param(0);
let param_argv = bx.get_param(1);
let arg_argc = bx.intcast(param_argc, cx.type_isize(), true);
let arg_argv = param_argv;
(arg_argc, arg_argv)
} else {
// The Rust start function doesn't need argc and argv, so just pass zeros.
let arg_argc = bx.const_int(cx.type_int(), 0);
let arg_argv = bx.const_null(cx.type_ptr_to(cx.type_i8p()));
(arg_argc, arg_argv)
};
let (arg_argc, arg_argv) = get_argc_argv(cx, &mut bx);

let (start_fn, args) = if use_start_lang_item {
let start_def_id = cx.tcx().require_lang_item(StartFnLangItem, None);
Expand All @@ -477,6 +467,27 @@ pub fn maybe_create_entry_wrapper<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(cx: &'
}
}

/// Obtain the `argc` and `argv` values to pass to the rust start function.
fn get_argc_argv<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
cx: &'a Bx::CodegenCx,
bx: &mut Bx
) -> (Bx::Value, Bx::Value)
{
if cx.sess().target.target.options.main_needs_argc_argv {
// Params from native `main()` used as args for rust start function
let param_argc = bx.get_param(0);
let param_argv = bx.get_param(1);
let arg_argc = bx.intcast(param_argc, cx.type_isize(), true);
let arg_argv = param_argv;
(arg_argc, arg_argv)
} else {
// The Rust start function doesn't need `argc` and `argv`, so just pass zeros.
let arg_argc = bx.const_int(cx.type_int(), 0);
let arg_argv = bx.const_null(cx.type_ptr_to(cx.type_i8p()));
(arg_argc, arg_argv)
}
}

pub const CODEGEN_WORKER_ID: usize = ::std::usize::MAX;

pub fn codegen_crate<B: ExtraBackendMethods>(
Expand Down