Dwarf: remove comptime parameters from generic origin functions

Since generic instantiations are missing comptime arguments in Air, they
must be removed from the generic origins too.

Author: jacobly0

src/link/Dwarf.zig

@@ -2008,9 +2008,9 @@ pub const WipNav = struct {
                     .decl_const_runtime_bits,
                     .decl_const_comptime_state,
                     .decl_const_runtime_bits_comptime_state,
-                    .decl_empty_func,
+                    .decl_nullary_func,
                     .decl_func,
-                    .decl_empty_func_generic,
+                    .decl_nullary_func_generic,
                     .decl_func_generic,
                     => false,
                     .generic_decl_var,
@@ -2626,8 +2626,8 @@ pub fn finishWipNavFunc(
                 abbrev_code_buf,
                 try dwarf.refAbbrevCode(switch (abbrev_code) {
                     else => unreachable,
-                    .decl_func => .decl_empty_func,
-                    .decl_instance_func => .decl_instance_empty_func,
+                    .decl_func => .decl_nullary_func,
+                    .decl_instance_func => .decl_instance_nullary_func,
                 }),
             );
         }
@@ -3012,29 +3012,34 @@ fn updateComptimeNavInner(dwarf: *Dwarf, pt: Zcu.PerThread, nav_index: InternPoo
             if (nav_gop.found_existing) switch (try dwarf.debug_info.declAbbrevCode(wip_nav.unit, nav_gop.value_ptr.*)) {
                 .null => {},
                 else => unreachable,
-                .decl_empty_func, .decl_func, .decl_instance_empty_func, .decl_instance_func => return,
-                .decl_empty_func_generic,
+                .decl_nullary_func, .decl_func, .decl_instance_nullary_func, .decl_instance_func => return,
+                .decl_nullary_func_generic,
                 .decl_func_generic,
-                .decl_instance_empty_func_generic,
+                .decl_instance_nullary_func_generic,
                 .decl_instance_func_generic,
                 => dwarf.debug_info.section.getUnit(wip_nav.unit).getEntry(nav_gop.value_ptr.*).clear(),
             } else nav_gop.value_ptr.* = try dwarf.addCommonEntry(wip_nav.unit);
             wip_nav.entry = nav_gop.value_ptr.*;
 
             const func_type = ip.indexToKey(func.ty).func_type;
+            const is_nullary = !func_type.is_var_args and for (0..func_type.param_types.len) |param_index| {
+                if (!func_type.paramIsComptime(std.math.cast(u5, param_index) orelse break false)) break false;
+            } else true;
             const diw = wip_nav.debug_info.writer(dwarf.gpa);
-            try wip_nav.declCommon(if (func_type.param_types.len > 0 or func_type.is_var_args) .{
-                .decl = .decl_func_generic,
+            try wip_nav.declCommon(if (is_nullary) .{
+                .decl = .decl_nullary_func_generic,
                 .generic_decl = .generic_decl_func,
-                .decl_instance = .decl_instance_func_generic,
+                .decl_instance = .decl_instance_nullary_func_generic,
             } else .{
-                .decl = .decl_empty_func_generic,
+                .decl = .decl_func_generic,
                 .generic_decl = .generic_decl_func,
-                .decl_instance = .decl_instance_empty_func_generic,
+                .decl_instance = .decl_instance_func_generic,
             }, &nav, inst_info.file, &decl);
             try wip_nav.refType(.fromInterned(func_type.return_type));
-            if (func_type.param_types.len > 0 or func_type.is_var_args) {
+            if (!is_nullary) {
                 for (0..func_type.param_types.len) |param_index| {
+                    if (std.math.cast(u5, param_index)) |small_param_index|
+                        if (func_type.paramIsComptime(small_param_index)) continue;
                     try wip_nav.abbrevCode(.func_type_param);
                     try wip_nav.refType(.fromInterned(func_type.param_types.get(ip)[param_index]));
                 }
@@ -3568,12 +3573,14 @@ fn updateLazyType(
             };
             try diw.writeByte(@intFromEnum(cc));
             try wip_nav.refType(.fromInterned(func_type.return_type));
-            for (0..func_type.param_types.len) |param_index| {
-                try wip_nav.abbrevCode(.func_type_param);
-                try wip_nav.refType(.fromInterned(func_type.param_types.get(ip)[param_index]));
+            if (!is_nullary) {
+                for (0..func_type.param_types.len) |param_index| {
+                    try wip_nav.abbrevCode(.func_type_param);
+                    try wip_nav.refType(.fromInterned(func_type.param_types.get(ip)[param_index]));
+                }
+                if (func_type.is_var_args) try wip_nav.abbrevCode(.is_var_args);
+                try uleb128(diw, @intFromEnum(AbbrevCode.null));
             }
-            if (func_type.is_var_args) try wip_nav.abbrevCode(.is_var_args);
-            if (!is_nullary) try uleb128(diw, @intFromEnum(AbbrevCode.null));
         },
         .error_set_type => |error_set_type| {
             try wip_nav.abbrevCode(if (error_set_type.names.len == 0) .generated_empty_enum_type else .generated_enum_type);
@@ -4787,9 +4794,9 @@ const AbbrevCode = enum {
     decl_const_runtime_bits,
     decl_const_comptime_state,
     decl_const_runtime_bits_comptime_state,
-    decl_empty_func,
+    decl_nullary_func,
     decl_func,
-    decl_empty_func_generic,
+    decl_nullary_func_generic,
     decl_func_generic,
     generic_decl_var,
     generic_decl_const,
@@ -4806,9 +4813,9 @@ const AbbrevCode = enum {
     decl_instance_const_runtime_bits,
     decl_instance_const_comptime_state,
     decl_instance_const_runtime_bits_comptime_state,
-    decl_instance_empty_func,
+    decl_instance_nullary_func,
     decl_instance_func,
-    decl_instance_empty_func_generic,
+    decl_instance_nullary_func_generic,
     decl_instance_func_generic,
     // the rest are unrestricted other than empty variants must not be longer
     // than the non-empty variant, and so should appear first
@@ -5019,7 +5026,7 @@ const AbbrevCode = enum {
                 .{ .ZIG_comptime_value, .ref_addr },
             },
         },
-        .decl_empty_func = .{
+        .decl_nullary_func = .{
             .tag = .subprogram,
             .attrs = decl_abbrev_common_attrs ++ .{
                 .{ .linkage_name, .strp },
@@ -5044,7 +5051,7 @@ const AbbrevCode = enum {
                 .{ .noreturn, .flag },
             },
         },
-        .decl_empty_func_generic = .{
+        .decl_nullary_func_generic = .{
             .tag = .subprogram,
             .attrs = decl_abbrev_common_attrs ++ .{
                 .{ .type, .ref_addr },
@@ -5167,7 +5174,7 @@ const AbbrevCode = enum {
                 .{ .ZIG_comptime_value, .ref_addr },
             },
         },
-        .decl_instance_empty_func = .{
+        .decl_instance_nullary_func = .{
             .tag = .subprogram,
             .attrs = decl_instance_abbrev_common_attrs ++ .{
                 .{ .linkage_name, .strp },
@@ -5192,7 +5199,7 @@ const AbbrevCode = enum {
                 .{ .noreturn, .flag },
             },
         },
-        .decl_instance_empty_func_generic = .{
+        .decl_instance_nullary_func_generic = .{
             .tag = .subprogram,
             .attrs = decl_instance_abbrev_common_attrs ++ .{
                 .{ .type, .ref_addr },