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Sema: rewrite semantic analysis of function calls

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This rewrite improves some error messages, hugely simplifies the logic,
and fixes several bugs. One of these bugs is technically a new rule
which Andrew and I agreed on: if a parameter has a comptime-only type
but is not declared `comptime`, then the corresponding call argument
should not be *evaluated* at comptime; only resolved. Implementing this
required changing how function types work a little, which in turn
required allowing a new kind of function coercion for some generic use
cases: function coercions are now allowed to implicitly *remove*
`comptime` annotations from parameters with comptime-only types. This is
okay because removing the annotation affects only the call site.

Resolves: #22262
This commit is contained in:
mlugg
2025-01-05 05:27:48 +00:00
parent 3f95003d4c
commit e9bd2d45d4
36 changed files with 842 additions and 1221 deletions
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6
lib/std/zig.zig
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@@ -749,6 +749,8 @@ pub const SimpleComptimeReason = enum(u32) {
array_mul_factor,
slice_cat_operand,
comptime_call_target,
inline_call_target,
generic_call_target,
wasm_memory_index,
work_group_dim_index,
@@ -791,7 +793,6 @@ pub const SimpleComptimeReason = enum(u32) {
struct_field_default_value,
enum_field_tag_value,
slice_single_item_ptr_bounds,
comptime_param_arg,
stored_to_comptime_field,
stored_to_comptime_var,
casted_to_comptime_enum,
@@ -828,6 +829,8 @@ pub const SimpleComptimeReason = enum(u32) {
.array_mul_factor => "array multiplication factor must be comptime-known",
.slice_cat_operand => "slice being concatenated must be comptime-known",
.comptime_call_target => "function being called at comptime must be comptime-known",
.inline_call_target => "function being called inline must be comptime-known",
.generic_call_target => "generic function being called must be comptime-known",
.wasm_memory_index => "wasm memory index must be comptime-known",
.work_group_dim_index => "work group dimension index must be comptime-known",
@@ -865,7 +868,6 @@ pub const SimpleComptimeReason = enum(u32) {
.struct_field_default_value => "struct field default value must be comptime-known",
.enum_field_tag_value => "enum field tag value must be comptime-known",
.slice_single_item_ptr_bounds => "slice of single-item pointer must have comptime-known bounds",
.comptime_param_arg => "argument to comptime parameter must be comptime-known",
.stored_to_comptime_field => "value stored to a comptime field must be comptime-known",
.stored_to_comptime_var => "value stored to a comptime variable must be comptime-known",
.casted_to_comptime_enum => "value casted to enum with 'comptime_int' tag type must be comptime-known",