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Support float template params (#6801)

Browse Source 
https://github.com/carbon-language/carbon-lang/issues/6717
This commit is contained in:
Nicholas Bishop
2026-02-27 01:30:40 +00:00
committed by GitHub
parent 41dd256d56
commit a6a0e55167
2 changed files with 42 additions and 23 deletions
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toolchain/check/cpp/call.cpp
+31 -23
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@@ -154,27 +154,29 @@ static auto ConvertArgToTemplateArg(
}
}
// Handle integer parameters.
if (param_type->isIntegerType()) {
// Get the Carbon type corresponding to the parameter's Clang type.
const auto type_expr =
ImportCppType(context, SemIR::LocId(arg_id), param_type);
// Get the Carbon type corresponding to the parameter's Clang type.
const auto type_expr =
ImportCppType(context, SemIR::LocId(arg_id), param_type);
// Try to convert the argument to the parameter type.
const auto converted_inst_id =
Convert(context, SemIR::LocId(arg_id), arg_id,
{
.kind = ConversionTarget::Value,
.type_id = type_expr.type_id,
});
// Try to convert the argument to the parameter type.
const auto converted_inst_id =
Convert(context, SemIR::LocId(arg_id), arg_id,
{
.kind = ConversionTarget::Value,
.type_id = type_expr.type_id,
});
if (converted_inst_id == SemIR::ErrorInst::InstId) {
return std::nullopt;
}
if (converted_inst_id == SemIR::ErrorInst::InstId) {
return std::nullopt;
}
auto const_inst_id =
context.constant_values().GetConstantInstId(converted_inst_id);
if (const_inst_id.has_value()) {
// TODO: provide a better location.
auto template_loc = clang::TemplateArgumentLocInfo();
auto const_inst_id =
context.constant_values().GetConstantInstId(converted_inst_id);
if (const_inst_id.has_value()) {
if (param_type->isIntegerType()) {
if (auto int_value =
context.insts().TryGetAs<SemIR::IntValue>(const_inst_id)) {
const auto& ap_int = context.ints().Get(int_value->int_id);
@@ -183,11 +185,17 @@ static auto ConvertArgToTemplateArg(
auto aps_int =
llvm::APSInt(ap_int, is_unsigned)
.extOrTrunc(context.ast_context().getIntWidth(param_type));
auto template_arg = clang::TemplateArgument(context.ast_context(),
aps_int, param_type);
// TODO: provide a better location.
auto loc = clang::TemplateArgumentLocInfo();
return clang::TemplateArgumentLoc(template_arg, loc);
clang::TemplateArgument template_arg(context.ast_context(), aps_int,
param_type);
return clang::TemplateArgumentLoc(template_arg, template_loc);
}
} else if (param_type->isFloatingType()) {
if (auto float_value =
context.insts().TryGetAs<SemIR::FloatValue>(const_inst_id)) {
const auto& ap_float = context.floats().Get(float_value->float_id);
clang::TemplateArgument template_arg(
context.ast_context(), param_type, clang::APValue(ap_float));
return clang::TemplateArgumentLoc(template_arg, template_loc);
}
}
}