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Export of internal Abseil changes.

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eca34da4ccb7bb6a580f1364dff9ca053418fa3b by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 214305433

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35393bdd21a87c4286f945fd34dda93afc4e0cd6 by Abseil Team <absl-team@google.com>:

Move some implementation details of string_view around to facilitate compiling on NVCC.

Abseil does not officially support NVCC as a reminder.

PiperOrigin-RevId: 214184876

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61846cab9ab9476a4676ecade7173f68978cd038 by Jorg Brown <jorg@google.com>:

Move the initialization values for constants back to their declaration.

PiperOrigin-RevId: 214135927

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7ac7df6c5f78f2faf419268c04618b936cb26065 by Abseil Team <absl-team@google.com>:

Performance improvements on format parser.

PiperOrigin-RevId: 214032366

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90b4c0cf20e9feaa257a7ece40adaf7db40a60a7 by Xiaoyi Zhang <zhangxy@google.com>:

Add static_assert check to absl::visit to make sure all overloads of the visitor return the same type, as required by the C++ standard.

PiperOrigin-RevId: 213677001

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787995342101b4c181291cde9ecea3048536e4bd by Abseil Team <absl-team@google.com>:

Update comment to indicate finite durations are less than InfiniteDuration.

PiperOrigin-RevId: 213660328

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d78f0dce7cc31218807e96d93b9e8513b6c80b24 by Jon Cohen <cohenjon@google.com>:

s/invariant/contract in the exceptions safety testing framework.  This is a better term as these can be type invariants or function post conditions.  They also are very similar ground as to what is covered by c++20 Contracts (and could even be replaced by them.

PiperOrigin-RevId: 213631019

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0b3ff1a640de9a7391a6c233568802cf86245b0e by Abseil Team <absl-team@google.com>:

Add noinline attribute for GetStackTrace/GetStackFrames/... so the skipped frames will not change because of inlining difference.

PiperOrigin-RevId: 213009637
GitOrigin-RevId: eca34da4ccb7bb6a580f1364dff9ca053418fa3b
Change-Id: Iff1022fd24e440fcbdf3c4ab2a915ca8954daa31
This commit is contained in:
Abseil Team 2018-09-24 11:57:52 -07:00 • committed by Derek Mauro
parent 8ff1374008
commit e01d95528e
15 changed files with 251 additions and 223 deletions
Download patch file Download diff file Expand all files Collapse all files

75
absl/strings/internal/str_format/parser.cc
View file

@ -84,16 +84,24 @@ bool ConsumeConversion(string_view *src, UnboundConversion *conv,
const char *pos = src->data();
const char *const end = pos + src->size();
char c;
// Read the next char into `c` and update `pos`. Reads '\0' if at end.
const auto get_char = [&] { c = pos == end ? '\0' : *pos++; };
// Read the next char into `c` and update `pos`. Returns false if there are
// no more chars to read.
#define ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR() \
do { \
if (ABSL_PREDICT_FALSE(pos == end)) return false; \
c = *pos++; \
} while (0)
const auto parse_digits = [&] {
int digits = c - '0';
// We do not want to overflow `digits` so we consume at most digits10-1
// We do not want to overflow `digits` so we consume at most digits10
// digits. If there are more digits the parsing will fail later on when the
// digit doesn't match the expected characters.
int num_digits = std::numeric_limits<int>::digits10 - 2;
for (get_char(); num_digits && std::isdigit(c); get_char()) {
int num_digits = std::numeric_limits<int>::digits10;
for (;;) {
if (ABSL_PREDICT_FALSE(pos == end || !num_digits)) break;
c = *pos++;
if (!std::isdigit(c)) break;
--num_digits;
digits = 10 * digits + c - '0';
}
@ -101,14 +109,14 @@ bool ConsumeConversion(string_view *src, UnboundConversion *conv,
};
if (is_positional) {
get_char();
if (c < '1' || c > '9') return false;
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return false;
conv->arg_position = parse_digits();
assert(conv->arg_position > 0);
if (c != '$') return false;
if (ABSL_PREDICT_FALSE(c != '$')) return false;
}
get_char();
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
// We should start with the basic flag on.
assert(conv->flags.basic);
@ -119,32 +127,39 @@ bool ConsumeConversion(string_view *src, UnboundConversion *conv,
if (c < 'A') {
conv->flags.basic = false;
for (; c <= '0'; get_char()) {
for (; c <= '0';) {
// FIXME: We might be able to speed this up reusing the kIds lookup table
// from above.
// It might require changing Flags to be a plain integer where we can |= a
// value.
switch (c) {
case '-':
conv->flags.left = true;
continue;
break;
case '+':
conv->flags.show_pos = true;
continue;
break;
case ' ':
conv->flags.sign_col = true;
continue;
break;
case '#':
conv->flags.alt = true;
continue;
break;
case '0':
conv->flags.zero = true;
continue;
break;
default:
goto flags_done;
}
break;
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
}
flags_done:
if (c <= '9') {
if (c >= '0') {
int maybe_width = parse_digits();
if (!is_positional && c == '$') {
if (*next_arg != 0) return false;
if (ABSL_PREDICT_FALSE(*next_arg != 0)) return false;
// Positional conversion.
*next_arg = -1;
conv->flags = Flags();
@ -153,12 +168,12 @@ bool ConsumeConversion(string_view *src, UnboundConversion *conv,
}
conv->width.set_value(maybe_width);
} else if (c == '*') {
get_char();
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
if (is_positional) {
if (c < '1' || c > '9') return false;
if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return false;
conv->width.set_from_arg(parse_digits());
if (c != '$') return false;
get_char();
if (ABSL_PREDICT_FALSE(c != '$')) return false;
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
} else {
conv->width.set_from_arg(++*next_arg);
}
@ -166,16 +181,16 @@ bool ConsumeConversion(string_view *src, UnboundConversion *conv,
}
if (c == '.') {
get_char();
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
if (std::isdigit(c)) {
conv->precision.set_value(parse_digits());
} else if (c == '*') {
get_char();
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
if (is_positional) {
if (c < '1' || c > '9') return false;
if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return false;
conv->precision.set_from_arg(parse_digits());
if (c != '$') return false;
get_char();
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
} else {
conv->precision.set_from_arg(++*next_arg);
}
@ -188,23 +203,23 @@ bool ConsumeConversion(string_view *src, UnboundConversion *conv,
std::int8_t id = kIds[static_cast<unsigned char>(c)];
if (id < 0) {
if (id == none) return false;
if (ABSL_PREDICT_FALSE(id == none)) return false;
// It is a length modifier.
using str_format_internal::LengthMod;
LengthMod length_mod = LengthMod::FromId(static_cast<LM>(~id));
get_char();
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
if (c == 'h' && length_mod.id() == LengthMod::h) {
conv->length_mod = LengthMod::FromId(LengthMod::hh);
get_char();
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
} else if (c == 'l' && length_mod.id() == LengthMod::l) {
conv->length_mod = LengthMod::FromId(LengthMod::ll);
get_char();
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
} else {
conv->length_mod = length_mod;
}
id = kIds[static_cast<unsigned char>(c)];
if (id < 0) return false;
if (ABSL_PREDICT_FALSE(id < 0)) return false;
}
assert(CheckFastPathSetting(*conv));