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Sema: restrict what can appear in a naked function

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* Disable runtime calls, since it is not possible to know the proper
   stack adjustment to follow the callee abi.
 * Disable runtime returns, since it is not possible to know where the
   return address is stored in general.
 * Allow implicit returns regardless of the return type, which allows
   naked functions with a non-void return type to be written.
This commit is contained in:
Jacob Young
2023-07-31 01:50:54 -04:00
parent 9831f27238
commit 2ba787e303
2 changed files with 31 additions and 3 deletions
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3
src/Module.zig
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@@ -4186,6 +4186,7 @@ pub fn semaFile(mod: *Module, file: *File) SemaError!void {
.owner_decl = new_decl,
.owner_decl_index = new_decl_index,
.func_index = .none,
.func_is_naked = false,
.fn_ret_ty = Type.void,
.fn_ret_ty_ies = null,
.owner_func_index = .none,
@@ -4268,6 +4269,7 @@ fn semaDecl(mod: *Module, decl_index: Decl.Index) !bool {
.owner_decl = decl,
.owner_decl_index = decl_index,
.func_index = .none,
.func_is_naked = false,
.fn_ret_ty = Type.void,
.fn_ret_ty_ies = null,
.owner_func_index = .none,
@@ -5213,6 +5215,7 @@ pub fn analyzeFnBody(mod: *Module, func_index: InternPool.Index, arena: Allocato
.owner_decl = decl,
.owner_decl_index = decl_index,
.func_index = func_index,
.func_is_naked = fn_ty_info.cc == .Naked,
.fn_ret_ty = fn_ty_info.return_type.toType(),
.fn_ret_ty_ies = null,
.owner_func_index = func_index,