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Remove string_view_metadata

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string_view_metadata was introduced to make compiled format relocatable.
However, format string compilation is an optimization and therefore
adding overhead and extra complexity for relocation is undesirable.
In most cases the string will be either static or outlive compilation
and formatting and if it doesn't, it's possible to make compiled
representation relocatale by other means.
This commit is contained in:
Victor Zverovich
2019-09-01 11:10:49 -07:00
parent 7cad33563c
commit f18a3f36a7
3 changed files with 16 additions and 39 deletions
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include/fmt/compile.h
+10 -13
View File
@@ -27,11 +27,11 @@ template <typename Char> struct format_part {
kind part_kind;
union value {
unsigned arg_index;
string_view_metadata str;
basic_string_view<Char> str;
replacement repl;
FMT_CONSTEXPR value(unsigned index = 0) : arg_index(index) {}
FMT_CONSTEXPR value(string_view_metadata s) : str(s) {}
FMT_CONSTEXPR value(basic_string_view<Char> s) : str(s) {}
FMT_CONSTEXPR value(replacement r) : repl(r) {}
} val;
std::size_t arg_id_end = 0; // Position past the end of the argument id.
@@ -42,10 +42,10 @@ template <typename Char> struct format_part {
static FMT_CONSTEXPR format_part make_arg_index(unsigned index) {
return format_part(kind::arg_index, index);
}
static FMT_CONSTEXPR format_part make_arg_name(string_view_metadata name) {
static FMT_CONSTEXPR format_part make_arg_name(basic_string_view<Char> name) {
return format_part(kind::arg_name, name);
}
static FMT_CONSTEXPR format_part make_text(string_view_metadata text) {
static FMT_CONSTEXPR format_part make_text(basic_string_view<Char> text) {
return format_part(kind::text, text);
}
static FMT_CONSTEXPR format_part make_replacement(replacement repl) {
@@ -105,10 +105,8 @@ class format_string_compiler : public error_handler {
parse_context_(format_str) {}
FMT_CONSTEXPR void on_text(const Char* begin, const Char* end) {
if (begin == end) return;
const auto offset = begin - format_str_.data();
const auto size = end - begin;
handler_(part::make_text(string_view_metadata(offset, size)));
if (begin != end)
handler_(part::make_text({begin, to_unsigned(end - begin)}));
}
FMT_CONSTEXPR void on_arg_id() {
@@ -121,7 +119,7 @@ class format_string_compiler : public error_handler {
}
FMT_CONSTEXPR void on_arg_id(basic_string_view<Char> id) {
part_ = part::make_arg_name(string_view_metadata(format_str_, id));
part_ = part::make_arg_name(id);
}
FMT_CONSTEXPR void on_replacement_field(const Char* ptr) {
@@ -191,7 +189,7 @@ class compiled_format {
switch (part.part_kind) {
case format_part_t::kind::text: {
const auto text = value.str.to_view(format_view.data());
const auto text = value.str;
auto output = ctx.out();
auto&& it = internal::reserve(output, text.size());
it = std::copy_n(text.begin(), text.size(), it);
@@ -205,15 +203,14 @@ class compiled_format {
case format_part_t::kind::arg_name: {
advance_parse_context_to_specification(parse_ctx, part);
const auto named_arg_id = value.str.to_view(format_view.data());
const auto named_arg_id = value.str;
format_arg<Range>(parse_ctx, ctx, named_arg_id);
} break;
case format_part_t::kind::replacement: {
const auto& arg_id_value = value.repl.arg_id.val;
const auto arg = value.repl.arg_id.kind == arg_id_kind::index
? ctx.arg(arg_id_value.index)
: ctx.arg(arg_id_value.name.to_view(
to_string_view(format_).data()));
: ctx.arg(arg_id_value.name);
auto specs = value.repl.specs;