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Support calling constexpr functions at compile time (#6878)

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Example:

```carbon
import Cpp inline '''
constexpr int f(int a, int b) { return a + b; }
''';

let a: array(i32, Cpp.f(1, 2)) = (1, 2, 3);
```
This commit is contained in:
Nicholas Bishop
2026-03-12 01:45:31 +00:00
committed by GitHub
parent 5d41529590
commit c1fd771242
11 changed files with 749 additions and 76 deletions
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toolchain/check/cpp/import.cpp
+9
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@@ -1469,6 +1469,14 @@ static auto ImportFunction(Context& context, SemIR::LocId loc_id,
}
}
SemIR::FunctionFields::EvaluationMode evaluation_mode =
SemIR::FunctionFields::EvaluationMode::None;
if (clang_decl->isConsteval()) {
evaluation_mode = SemIR::FunctionFields::EvaluationMode::MustEval;
} else if (clang_decl->isConstexpr()) {
evaluation_mode = SemIR::FunctionFields::EvaluationMode::Eval;
}
auto [decl_id, function_id] = MakeFunctionDecl(
context, import_ir_inst_id, decl_block_id, /*build_generic=*/false,
/*is_definition=*/false,
@@ -1499,6 +1507,7 @@ static auto ImportFunction(Context& context, SemIR::LocId loc_id,
.return_patterns_id = function_params_insts->return_patterns_id,
.virtual_modifier = virtual_modifier,
.virtual_index = virtual_index,
.evaluation_mode = evaluation_mode,
.self_param_id = FindSelfPattern(
context, function_params_insts->implicit_param_patterns_id),
}});