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-rw-r--r--absl/base/internal/unaligned_access.h165
-rw-r--r--absl/container/inlined_vector.h25
-rw-r--r--absl/container/internal/inlined_vector.h9
-rw-r--r--absl/hash/BUILD.bazel2
-rw-r--r--absl/strings/charconv.h4
-rw-r--r--absl/strings/internal/str_format/bind_test.cc9
-rw-r--r--absl/strings/internal/str_format/parser.cc143
-rw-r--r--absl/strings/internal/str_format/parser.h128
-rw-r--r--absl/strings/internal/str_format/parser_test.cc25
-rw-r--r--absl/strings/numbers.cc4
10 files changed, 186 insertions, 328 deletions
diff --git a/absl/base/internal/unaligned_access.h b/absl/base/internal/unaligned_access.h
index 2d667377..2cf7c1d4 100644
--- a/absl/base/internal/unaligned_access.h
+++ b/absl/base/internal/unaligned_access.h
@@ -25,15 +25,6 @@
// unaligned APIs
// Portable handling of unaligned loads, stores, and copies.
-// On some platforms, like ARM, the copy functions can be more efficient
-// then a load and a store.
-//
-// It is possible to implement all of these these using constant-length memcpy
-// calls, which is portable and will usually be inlined into simple loads and
-// stores if the architecture supports it. However, such inlining usually
-// happens in a pass that's quite late in compilation, which means the resulting
-// loads and stores cannot participate in many other optimizations, leading to
-// overall worse code.
// The unaligned API is C++ only. The declarations use C++ features
// (namespaces, inline) which are absent or incompatible in C.
@@ -108,164 +99,8 @@ inline void UnalignedStore64(void *p, uint64_t v) {
#define ABSL_INTERNAL_UNALIGNED_STORE64(_p, _val) \
(absl::base_internal::UnalignedStore64(_p, _val))
-#elif defined(UNDEFINED_BEHAVIOR_SANITIZER)
-
-namespace absl {
-namespace base_internal {
-
-inline uint16_t UnalignedLoad16(const void *p) {
- uint16_t t;
- memcpy(&t, p, sizeof t);
- return t;
-}
-
-inline uint32_t UnalignedLoad32(const void *p) {
- uint32_t t;
- memcpy(&t, p, sizeof t);
- return t;
-}
-
-inline uint64_t UnalignedLoad64(const void *p) {
- uint64_t t;
- memcpy(&t, p, sizeof t);
- return t;
-}
-
-inline void UnalignedStore16(void *p, uint16_t v) { memcpy(p, &v, sizeof v); }
-
-inline void UnalignedStore32(void *p, uint32_t v) { memcpy(p, &v, sizeof v); }
-
-inline void UnalignedStore64(void *p, uint64_t v) { memcpy(p, &v, sizeof v); }
-
-} // namespace base_internal
-} // namespace absl
-
-#define ABSL_INTERNAL_UNALIGNED_LOAD16(_p) \
- (absl::base_internal::UnalignedLoad16(_p))
-#define ABSL_INTERNAL_UNALIGNED_LOAD32(_p) \
- (absl::base_internal::UnalignedLoad32(_p))
-#define ABSL_INTERNAL_UNALIGNED_LOAD64(_p) \
- (absl::base_internal::UnalignedLoad64(_p))
-
-#define ABSL_INTERNAL_UNALIGNED_STORE16(_p, _val) \
- (absl::base_internal::UnalignedStore16(_p, _val))
-#define ABSL_INTERNAL_UNALIGNED_STORE32(_p, _val) \
- (absl::base_internal::UnalignedStore32(_p, _val))
-#define ABSL_INTERNAL_UNALIGNED_STORE64(_p, _val) \
- (absl::base_internal::UnalignedStore64(_p, _val))
-
-#elif defined(__x86_64__) || defined(_M_X64) || defined(__i386) || \
- defined(_M_IX86) || defined(__ppc__) || defined(__PPC__) || \
- defined(__ppc64__) || defined(__PPC64__)
-
-// x86 and x86-64 can perform unaligned loads/stores directly;
-// modern PowerPC hardware can also do unaligned integer loads and stores;
-// but note: the FPU still sends unaligned loads and stores to a trap handler!
-
-#define ABSL_INTERNAL_UNALIGNED_LOAD16(_p) \
- (*reinterpret_cast<const uint16_t *>(_p))
-#define ABSL_INTERNAL_UNALIGNED_LOAD32(_p) \
- (*reinterpret_cast<const uint32_t *>(_p))
-#define ABSL_INTERNAL_UNALIGNED_LOAD64(_p) \
- (*reinterpret_cast<const uint64_t *>(_p))
-
-#define ABSL_INTERNAL_UNALIGNED_STORE16(_p, _val) \
- (*reinterpret_cast<uint16_t *>(_p) = (_val))
-#define ABSL_INTERNAL_UNALIGNED_STORE32(_p, _val) \
- (*reinterpret_cast<uint32_t *>(_p) = (_val))
-#define ABSL_INTERNAL_UNALIGNED_STORE64(_p, _val) \
- (*reinterpret_cast<uint64_t *>(_p) = (_val))
-
-#elif defined(__arm__) && \
- !defined(__ARM_ARCH_5__) && \
- !defined(__ARM_ARCH_5T__) && \
- !defined(__ARM_ARCH_5TE__) && \
- !defined(__ARM_ARCH_5TEJ__) && \
- !defined(__ARM_ARCH_6__) && \
- !defined(__ARM_ARCH_6J__) && \
- !defined(__ARM_ARCH_6K__) && \
- !defined(__ARM_ARCH_6Z__) && \
- !defined(__ARM_ARCH_6ZK__) && \
- !defined(__ARM_ARCH_6T2__)
-
-
-// ARMv7 and newer support native unaligned accesses, but only of 16-bit
-// and 32-bit values (not 64-bit); older versions either raise a fatal signal,
-// do an unaligned read and rotate the words around a bit, or do the reads very
-// slowly (trip through kernel mode). There's no simple #define that says just
-// "ARMv7 or higher", so we have to filter away all ARMv5 and ARMv6
-// sub-architectures. Newer gcc (>= 4.6) set an __ARM_FEATURE_ALIGNED #define,
-// so in time, maybe we can move on to that.
-//
-// This is a mess, but there's not much we can do about it.
-//
-// To further complicate matters, only LDR instructions (single reads) are
-// allowed to be unaligned, not LDRD (two reads) or LDM (many reads). Unless we
-// explicitly tell the compiler that these accesses can be unaligned, it can and
-// will combine accesses. On armcc, the way to signal this is done by accessing
-// through the type (uint32_t __packed *), but GCC has no such attribute
-// (it ignores __attribute__((packed)) on individual variables). However,
-// we can tell it that a _struct_ is unaligned, which has the same effect,
-// so we do that.
-
-namespace absl {
-namespace base_internal {
-
-struct Unaligned16Struct {
- uint16_t value;
- uint8_t dummy; // To make the size non-power-of-two.
-} ABSL_ATTRIBUTE_PACKED;
-
-struct Unaligned32Struct {
- uint32_t value;
- uint8_t dummy; // To make the size non-power-of-two.
-} ABSL_ATTRIBUTE_PACKED;
-
-} // namespace base_internal
-} // namespace absl
-
-#define ABSL_INTERNAL_UNALIGNED_LOAD16(_p) \
- ((reinterpret_cast<const ::absl::base_internal::Unaligned16Struct *>(_p)) \
- ->value)
-#define ABSL_INTERNAL_UNALIGNED_LOAD32(_p) \
- ((reinterpret_cast<const ::absl::base_internal::Unaligned32Struct *>(_p)) \
- ->value)
-
-#define ABSL_INTERNAL_UNALIGNED_STORE16(_p, _val) \
- ((reinterpret_cast< ::absl::base_internal::Unaligned16Struct *>(_p)) \
- ->value = (_val))
-#define ABSL_INTERNAL_UNALIGNED_STORE32(_p, _val) \
- ((reinterpret_cast< ::absl::base_internal::Unaligned32Struct *>(_p)) \
- ->value = (_val))
-
-namespace absl {
-namespace base_internal {
-
-inline uint64_t UnalignedLoad64(const void *p) {
- uint64_t t;
- memcpy(&t, p, sizeof t);
- return t;
-}
-
-inline void UnalignedStore64(void *p, uint64_t v) { memcpy(p, &v, sizeof v); }
-
-} // namespace base_internal
-} // namespace absl
-
-#define ABSL_INTERNAL_UNALIGNED_LOAD64(_p) \
- (absl::base_internal::UnalignedLoad64(_p))
-#define ABSL_INTERNAL_UNALIGNED_STORE64(_p, _val) \
- (absl::base_internal::UnalignedStore64(_p, _val))
-
#else
-// ABSL_INTERNAL_NEED_ALIGNED_LOADS is defined when the underlying platform
-// doesn't support unaligned access.
-#define ABSL_INTERNAL_NEED_ALIGNED_LOADS
-
-// These functions are provided for architectures that don't support
-// unaligned loads and stores.
-
namespace absl {
namespace base_internal {
diff --git a/absl/container/inlined_vector.h b/absl/container/inlined_vector.h
index 1ab4b2f4..978d5033 100644
--- a/absl/container/inlined_vector.h
+++ b/absl/container/inlined_vector.h
@@ -73,17 +73,12 @@ class InlinedVector {
using AllocatorTraits = typename Storage::AllocatorTraits;
template <typename Iterator>
- using IsAtLeastForwardIterator = std::is_convertible<
- typename std::iterator_traits<Iterator>::iterator_category,
- std::forward_iterator_tag>;
+ using EnableIfAtLeastForwardIterator = absl::enable_if_t<
+ inlined_vector_internal::IsAtLeastForwardIterator<Iterator>::value>;
template <typename Iterator>
- using EnableIfAtLeastForwardIterator =
- absl::enable_if_t<IsAtLeastForwardIterator<Iterator>::value>;
-
- template <typename Iterator>
- using DisableIfAtLeastForwardIterator =
- absl::enable_if_t<!IsAtLeastForwardIterator<Iterator>::value>;
+ using DisableIfAtLeastForwardIterator = absl::enable_if_t<
+ !inlined_vector_internal::IsAtLeastForwardIterator<Iterator>::value>;
using rvalue_reference = typename Storage::rvalue_reference;
@@ -1060,7 +1055,9 @@ class InlinedVector {
template <typename ForwardIt>
void AssignForwardRange(ForwardIt first, ForwardIt last) {
- static_assert(IsAtLeastForwardIterator<ForwardIt>::value, "");
+ static_assert(absl::inlined_vector_internal::IsAtLeastForwardIterator<
+ ForwardIt>::value,
+ "");
auto length = std::distance(first, last);
@@ -1084,7 +1081,9 @@ class InlinedVector {
template <typename ForwardIt>
void AppendForwardRange(ForwardIt first, ForwardIt last) {
- static_assert(IsAtLeastForwardIterator<ForwardIt>::value, "");
+ static_assert(absl::inlined_vector_internal::IsAtLeastForwardIterator<
+ ForwardIt>::value,
+ "");
auto length = std::distance(first, last);
reserve(size() + length);
@@ -1113,7 +1112,9 @@ class InlinedVector {
template <typename ForwardIt>
iterator InsertWithForwardRange(const_iterator position, ForwardIt first,
ForwardIt last) {
- static_assert(IsAtLeastForwardIterator<ForwardIt>::value, "");
+ static_assert(absl::inlined_vector_internal::IsAtLeastForwardIterator<
+ ForwardIt>::value,
+ "");
assert(position >= begin() && position <= end());
if (ABSL_PREDICT_FALSE(first == last))
diff --git a/absl/container/internal/inlined_vector.h b/absl/container/internal/inlined_vector.h
index 168d5b4e..b8b4f4ce 100644
--- a/absl/container/internal/inlined_vector.h
+++ b/absl/container/internal/inlined_vector.h
@@ -26,6 +26,11 @@
namespace absl {
namespace inlined_vector_internal {
+template <typename Iterator>
+using IsAtLeastForwardIterator = std::is_convertible<
+ typename std::iterator_traits<Iterator>::iterator_category,
+ std::forward_iterator_tag>;
+
template <typename InlinedVector>
class Storage;
@@ -89,9 +94,7 @@ class Storage<InlinedVector<T, N, A>> {
void AddSize(size_type count) { GetSizeAndIsAllocated() += count << 1; }
- void SetAllocatedData(pointer data) {
- data_.allocated.allocated_data = data;
- }
+ void SetAllocatedData(pointer data) { data_.allocated.allocated_data = data; }
void SetAllocatedCapacity(size_type capacity) {
data_.allocated.allocated_capacity = capacity;
diff --git a/absl/hash/BUILD.bazel b/absl/hash/BUILD.bazel
index 8c2daf70..e1e6eae8 100644
--- a/absl/hash/BUILD.bazel
+++ b/absl/hash/BUILD.bazel
@@ -35,10 +35,10 @@ cc_library(
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
- ":city",
"//absl/base:core_headers",
"//absl/base:endian",
"//absl/container:fixed_array",
+ "//absl/hash:city",
"//absl/meta:type_traits",
"//absl/numeric:int128",
"//absl/strings",
diff --git a/absl/strings/charconv.h b/absl/strings/charconv.h
index 59f74bf0..3f5891ba 100644
--- a/absl/strings/charconv.h
+++ b/absl/strings/charconv.h
@@ -49,9 +49,9 @@ struct from_chars_result {
// this only supports the `double` and `float` types.
//
// This interface incorporates the proposed resolutions for library issues
-// DR 3800 and DR 3801. If these are adopted with different wording,
+// DR 3080 and DR 3081. If these are adopted with different wording,
// Abseil's behavior will change to match the standard. (The behavior most
-// likely to change is for DR 3801, which says what `value` will be set to in
+// likely to change is for DR 3081, which says what `value` will be set to in
// the case of overflow and underflow. Code that wants to avoid possible
// breaking changes in this area should not depend on `value` when the returned
// from_chars_result indicates a range error.)
diff --git a/absl/strings/internal/str_format/bind_test.cc b/absl/strings/internal/str_format/bind_test.cc
index ba6470ec..2574801a 100644
--- a/absl/strings/internal/str_format/bind_test.cc
+++ b/absl/strings/internal/str_format/bind_test.cc
@@ -9,16 +9,11 @@ namespace absl {
namespace str_format_internal {
namespace {
-template <typename T, size_t N>
-size_t ArraySize(T (&)[N]) {
- return N;
-}
-
class FormatBindTest : public ::testing::Test {
public:
bool Extract(const char *s, UnboundConversion *props, int *next) const {
- absl::string_view src = s;
- return ConsumeUnboundConversion(&src, props, next) && src.empty();
+ return ConsumeUnboundConversion(s, s + strlen(s), props, next) ==
+ s + strlen(s);
}
};
diff --git a/absl/strings/internal/str_format/parser.cc b/absl/strings/internal/str_format/parser.cc
index 10487f23..9ef5615c 100644
--- a/absl/strings/internal/str_format/parser.cc
+++ b/absl/strings/internal/str_format/parser.cc
@@ -15,6 +15,44 @@
namespace absl {
namespace str_format_internal {
+
+using CC = ConversionChar::Id;
+using LM = LengthMod::Id;
+ABSL_CONST_INIT const ConvTag kTags[256] = {
+ {}, {}, {}, {}, {}, {}, {}, {}, // 00-07
+ {}, {}, {}, {}, {}, {}, {}, {}, // 08-0f
+ {}, {}, {}, {}, {}, {}, {}, {}, // 10-17
+ {}, {}, {}, {}, {}, {}, {}, {}, // 18-1f
+ {}, {}, {}, {}, {}, {}, {}, {}, // 20-27
+ {}, {}, {}, {}, {}, {}, {}, {}, // 28-2f
+ {}, {}, {}, {}, {}, {}, {}, {}, // 30-37
+ {}, {}, {}, {}, {}, {}, {}, {}, // 38-3f
+ {}, CC::A, {}, CC::C, {}, CC::E, CC::F, CC::G, // @ABCDEFG
+ {}, {}, {}, {}, LM::L, {}, {}, {}, // HIJKLMNO
+ {}, {}, {}, CC::S, {}, {}, {}, {}, // PQRSTUVW
+ CC::X, {}, {}, {}, {}, {}, {}, {}, // XYZ[\]^_
+ {}, CC::a, {}, CC::c, CC::d, CC::e, CC::f, CC::g, // `abcdefg
+ LM::h, CC::i, LM::j, {}, LM::l, {}, CC::n, CC::o, // hijklmno
+ CC::p, LM::q, {}, CC::s, LM::t, CC::u, {}, {}, // pqrstuvw
+ CC::x, {}, LM::z, {}, {}, {}, {}, {}, // xyz{|}!
+ {}, {}, {}, {}, {}, {}, {}, {}, // 80-87
+ {}, {}, {}, {}, {}, {}, {}, {}, // 88-8f
+ {}, {}, {}, {}, {}, {}, {}, {}, // 90-97
+ {}, {}, {}, {}, {}, {}, {}, {}, // 98-9f
+ {}, {}, {}, {}, {}, {}, {}, {}, // a0-a7
+ {}, {}, {}, {}, {}, {}, {}, {}, // a8-af
+ {}, {}, {}, {}, {}, {}, {}, {}, // b0-b7
+ {}, {}, {}, {}, {}, {}, {}, {}, // b8-bf
+ {}, {}, {}, {}, {}, {}, {}, {}, // c0-c7
+ {}, {}, {}, {}, {}, {}, {}, {}, // c8-cf
+ {}, {}, {}, {}, {}, {}, {}, {}, // d0-d7
+ {}, {}, {}, {}, {}, {}, {}, {}, // d8-df
+ {}, {}, {}, {}, {}, {}, {}, {}, // e0-e7
+ {}, {}, {}, {}, {}, {}, {}, {}, // e8-ef
+ {}, {}, {}, {}, {}, {}, {}, {}, // f0-f7
+ {}, {}, {}, {}, {}, {}, {}, {}, // f8-ff
+};
+
namespace {
bool CheckFastPathSetting(const UnboundConversion& conv) {
@@ -36,60 +74,17 @@ bool CheckFastPathSetting(const UnboundConversion& conv) {
return should_be_basic == conv.flags.basic;
}
-// Keep a single table for all the conversion chars and length modifiers.
-// We invert the length modifiers to make them negative so that we can easily
-// test for them.
-// Everything else is `none`, which is a negative constant.
-using CC = ConversionChar::Id;
-using LM = LengthMod::Id;
-static constexpr std::int8_t none = -128;
-static constexpr std::int8_t kIds[] = {
- none, none, none, none, none, none, none, none, // 00-07
- none, none, none, none, none, none, none, none, // 08-0f
- none, none, none, none, none, none, none, none, // 10-17
- none, none, none, none, none, none, none, none, // 18-1f
- none, none, none, none, none, none, none, none, // 20-27
- none, none, none, none, none, none, none, none, // 28-2f
- none, none, none, none, none, none, none, none, // 30-37
- none, none, none, none, none, none, none, none, // 38-3f
- none, CC::A, none, CC::C, none, CC::E, CC::F, CC::G, // @ABCDEFG
- none, none, none, none, ~LM::L, none, none, none, // HIJKLMNO
- none, none, none, CC::S, none, none, none, none, // PQRSTUVW
- CC::X, none, none, none, none, none, none, none, // XYZ[\]^_
- none, CC::a, none, CC::c, CC::d, CC::e, CC::f, CC::g, // `abcdefg
- ~LM::h, CC::i, ~LM::j, none, ~LM::l, none, CC::n, CC::o, // hijklmno
- CC::p, ~LM::q, none, CC::s, ~LM::t, CC::u, none, none, // pqrstuvw
- CC::x, none, ~LM::z, none, none, none, none, none, // xyz{|}~!
- none, none, none, none, none, none, none, none, // 80-87
- none, none, none, none, none, none, none, none, // 88-8f
- none, none, none, none, none, none, none, none, // 90-97
- none, none, none, none, none, none, none, none, // 98-9f
- none, none, none, none, none, none, none, none, // a0-a7
- none, none, none, none, none, none, none, none, // a8-af
- none, none, none, none, none, none, none, none, // b0-b7
- none, none, none, none, none, none, none, none, // b8-bf
- none, none, none, none, none, none, none, none, // c0-c7
- none, none, none, none, none, none, none, none, // c8-cf
- none, none, none, none, none, none, none, none, // d0-d7
- none, none, none, none, none, none, none, none, // d8-df
- none, none, none, none, none, none, none, none, // e0-e7
- none, none, none, none, none, none, none, none, // e8-ef
- none, none, none, none, none, none, none, none, // f0-f7
- none, none, none, none, none, none, none, none, // f8-ff
-};
-
template <bool is_positional>
-bool ConsumeConversion(string_view *src, UnboundConversion *conv,
- int *next_arg) {
- const char *pos = src->data();
- const char *const end = pos + src->size();
+const char *ConsumeConversion(const char *pos, const char *const end,
+ UnboundConversion *conv, int *next_arg) {
+ const char* const original_pos = pos;
char c;
// 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++; \
+#define ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR() \
+ do { \
+ if (ABSL_PREDICT_FALSE(pos == end)) return nullptr; \
+ c = *pos++; \
} while (0)
const auto parse_digits = [&] {
@@ -111,10 +106,10 @@ bool ConsumeConversion(string_view *src, UnboundConversion *conv,
if (is_positional) {
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
- if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return false;
+ if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return nullptr;
conv->arg_position = parse_digits();
assert(conv->arg_position > 0);
- if (ABSL_PREDICT_FALSE(c != '$')) return false;
+ if (ABSL_PREDICT_FALSE(c != '$')) return nullptr;
}
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
@@ -129,10 +124,9 @@ bool ConsumeConversion(string_view *src, UnboundConversion *conv,
conv->flags.basic = false;
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.
+ // FIXME: We might be able to speed this up reusing the 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;
@@ -160,20 +154,20 @@ flags_done:
if (c >= '0') {
int maybe_width = parse_digits();
if (!is_positional && c == '$') {
- if (ABSL_PREDICT_FALSE(*next_arg != 0)) return false;
+ if (ABSL_PREDICT_FALSE(*next_arg != 0)) return nullptr;
// Positional conversion.
*next_arg = -1;
conv->flags = Flags();
conv->flags.basic = true;
- return ConsumeConversion<true>(src, conv, next_arg);
+ return ConsumeConversion<true>(original_pos, end, conv, next_arg);
}
conv->width.set_value(maybe_width);
} else if (c == '*') {
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
if (is_positional) {
- if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return false;
+ if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return nullptr;
conv->width.set_from_arg(parse_digits());
- if (ABSL_PREDICT_FALSE(c != '$')) return false;
+ if (ABSL_PREDICT_FALSE(c != '$')) return nullptr;
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
} else {
conv->width.set_from_arg(++*next_arg);
@@ -188,9 +182,9 @@ flags_done:
} else if (c == '*') {
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
if (is_positional) {
- if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return false;
+ if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return nullptr;
conv->precision.set_from_arg(parse_digits());
- if (c != '$') return false;
+ if (c != '$') return nullptr;
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
} else {
conv->precision.set_from_arg(++*next_arg);
@@ -201,14 +195,14 @@ flags_done:
}
}
- std::int8_t id = kIds[static_cast<unsigned char>(c)];
+ auto tag = GetTagForChar(c);
- if (id < 0) {
- if (ABSL_PREDICT_FALSE(id == none)) return false;
+ if (ABSL_PREDICT_FALSE(!tag.is_conv())) {
+ if (ABSL_PREDICT_FALSE(!tag.is_length())) return nullptr;
// It is a length modifier.
using str_format_internal::LengthMod;
- LengthMod length_mod = LengthMod::FromId(static_cast<LM>(~id));
+ LengthMod length_mod = tag.as_length();
ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
if (c == 'h' && length_mod.id() == LengthMod::h) {
conv->length_mod = LengthMod::FromId(LengthMod::hh);
@@ -219,25 +213,24 @@ flags_done:
} else {
conv->length_mod = length_mod;
}
- id = kIds[static_cast<unsigned char>(c)];
- if (ABSL_PREDICT_FALSE(id < 0)) return false;
+ tag = GetTagForChar(c);
+ if (ABSL_PREDICT_FALSE(!tag.is_conv())) return nullptr;
}
assert(CheckFastPathSetting(*conv));
(void)(&CheckFastPathSetting);
- conv->conv = ConversionChar::FromId(static_cast<CC>(id));
+ conv->conv = tag.as_conv();
if (!is_positional) conv->arg_position = ++*next_arg;
- *src = string_view(pos, end - pos);
- return true;
+ return pos;
}
} // namespace
-bool ConsumeUnboundConversion(string_view *src, UnboundConversion *conv,
- int *next_arg) {
- if (*next_arg < 0) return ConsumeConversion<true>(src, conv, next_arg);
- return ConsumeConversion<false>(src, conv, next_arg);
+const char *ConsumeUnboundConversion(const char *p, const char *end,
+ UnboundConversion *conv, int *next_arg) {
+ if (*next_arg < 0) return ConsumeConversion<true>(p, end, conv, next_arg);
+ return ConsumeConversion<false>(p, end, conv, next_arg);
}
struct ParsedFormatBase::ParsedFormatConsumer {
diff --git a/absl/strings/internal/str_format/parser.h b/absl/strings/internal/str_format/parser.h
index 1022f062..b7614a09 100644
--- a/absl/strings/internal/str_format/parser.h
+++ b/absl/strings/internal/str_format/parser.h
@@ -63,17 +63,45 @@ struct UnboundConversion {
ConversionChar conv;
};
-// Consume conversion spec prefix (not including '%') of '*src' if valid.
+// Consume conversion spec prefix (not including '%') of [p, end) if valid.
// Examples of valid specs would be e.g.: "s", "d", "-12.6f".
-// If valid, the front of src is advanced such that src becomes the
-// part following the conversion spec, and the spec part is broken down and
-// returned in 'conv'.
-// If invalid, returns false and leaves 'src' unmodified.
-// For example:
-// Given "d9", returns "d", and leaves src="9",
-// Given "!", returns "" and leaves src="!".
-bool ConsumeUnboundConversion(string_view* src, UnboundConversion* conv,
- int* next_arg);
+// If valid, it returns the first character following the conversion spec,
+// and the spec part is broken down and returned in 'conv'.
+// If invalid, returns nullptr.
+const char* ConsumeUnboundConversion(const char* p, const char* end,
+ UnboundConversion* conv, int* next_arg);
+
+// Helper tag class for the table below.
+// It allows fast `char -> ConversionChar/LengthMod` checking and conversions.
+class ConvTag {
+ public:
+ constexpr ConvTag(ConversionChar::Id id) : tag_(id) {} // NOLINT
+ // We invert the length modifiers to make them negative so that we can easily
+ // test for them.
+ constexpr ConvTag(LengthMod::Id id) : tag_(~id) {} // NOLINT
+ // Everything else is -128, which is negative to make is_conv() simpler.
+ constexpr ConvTag() : tag_(-128) {}
+
+ bool is_conv() const { return tag_ >= 0; }
+ bool is_length() const { return tag_ < 0 && tag_ != -128; }
+ ConversionChar as_conv() const {
+ assert(is_conv());
+ return ConversionChar::FromId(static_cast<ConversionChar::Id>(tag_));
+ }
+ LengthMod as_length() const {
+ assert(is_length());
+ return LengthMod::FromId(static_cast<LengthMod::Id>(~tag_));
+ }
+
+ private:
+ std::int8_t tag_;
+};
+
+extern const ConvTag kTags[256];
+// Keep a single table for all the conversion chars and length modifiers.
+inline ConvTag GetTagForChar(char c) {
+ return kTags[static_cast<unsigned char>(c)];
+}
// Parse the format string provided in 'src' and pass the identified items into
// 'consumer'.
@@ -88,51 +116,53 @@ bool ConsumeUnboundConversion(string_view* src, UnboundConversion* conv,
template <typename Consumer>
bool ParseFormatString(string_view src, Consumer consumer) {
int next_arg = 0;
- while (!src.empty()) {
- const char* percent =
- static_cast<const char*>(memchr(src.data(), '%', src.size()));
+ const char* p = src.data();
+ const char* const end = p + src.size();
+ while (p != end) {
+ const char* percent = static_cast<const char*>(memchr(p, '%', end - p));
if (!percent) {
// We found the last substring.
- return consumer.Append(src);
+ return consumer.Append(string_view(p, end - p));
}
// We found a percent, so push the text run then process the percent.
- size_t percent_loc = percent - src.data();
- if (!consumer.Append(string_view(src.data(), percent_loc))) return false;
- if (percent + 1 >= src.data() + src.size()) return false;
-
- UnboundConversion conv;
-
- switch (percent[1]) {
- case '%':
- if (!consumer.Append("%")) return false;
- src.remove_prefix(percent_loc + 2);
- continue;
-
-#define PARSER_CASE(ch) \
- case #ch[0]: \
- src.remove_prefix(percent_loc + 2); \
- conv.conv = ConversionChar::FromId(ConversionChar::ch); \
- conv.arg_position = ++next_arg; \
- break;
- ABSL_CONVERSION_CHARS_EXPAND_(PARSER_CASE, );
-#undef PARSER_CASE
-
- default:
- src.remove_prefix(percent_loc + 1);
- if (!ConsumeUnboundConversion(&src, &conv, &next_arg)) return false;
- break;
- }
- if (next_arg == 0) {
- // This indicates an error in the format std::string.
- // The only way to get next_arg == 0 is to have a positional argument
- // first which sets next_arg to -1 and then a non-positional argument
- // which does ++next_arg.
- // Checking here seems to be the cheapeast place to do it.
+ if (ABSL_PREDICT_FALSE(!consumer.Append(string_view(p, percent - p)))) {
return false;
}
- if (!consumer.ConvertOne(
- conv, string_view(percent + 1, src.data() - (percent + 1)))) {
- return false;
+ if (ABSL_PREDICT_FALSE(percent + 1 >= end)) return false;
+
+ auto tag = GetTagForChar(percent[1]);
+ if (tag.is_conv()) {
+ if (ABSL_PREDICT_FALSE(next_arg < 0)) {
+ // This indicates an error in the format std::string.
+ // The only way to get `next_arg < 0` here is to have a positional
+ // argument first which sets next_arg to -1 and then a non-positional
+ // argument.
+ return false;
+ }
+ p = percent + 2;
+
+ // Keep this case separate from the one below.
+ // ConvertOne is more efficient when the compiler can see that the `basic`
+ // flag is set.
+ UnboundConversion conv;
+ conv.conv = tag.as_conv();
+ conv.arg_position = ++next_arg;
+ if (ABSL_PREDICT_FALSE(
+ !consumer.ConvertOne(conv, string_view(percent + 1, 1)))) {
+ return false;
+ }
+ } else if (percent[1] != '%') {
+ UnboundConversion conv;
+ p = ConsumeUnboundConversion(percent + 1, end, &conv, &next_arg);
+ if (ABSL_PREDICT_FALSE(p == nullptr)) return false;
+ if (ABSL_PREDICT_FALSE(!consumer.ConvertOne(
+ conv, string_view(percent + 1, p - (percent + 1))))) {
+ return false;
+ }
+ } else {
+ if (ABSL_PREDICT_FALSE(!consumer.Append("%"))) return false;
+ p = percent + 2;
+ continue;
}
}
return true;
diff --git a/absl/strings/internal/str_format/parser_test.cc b/absl/strings/internal/str_format/parser_test.cc
index ff705753..6d356093 100644
--- a/absl/strings/internal/str_format/parser_test.cc
+++ b/absl/strings/internal/str_format/parser_test.cc
@@ -1,6 +1,8 @@
#include "absl/strings/internal/str_format/parser.h"
#include <string.h>
+
+#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/base/macros.h"
@@ -9,6 +11,8 @@ namespace str_format_internal {
namespace {
+using testing::Pair;
+
TEST(LengthModTest, Names) {
struct Expectation {
int line;
@@ -63,20 +67,21 @@ TEST(ConversionCharTest, Names) {
class ConsumeUnboundConversionTest : public ::testing::Test {
public:
- typedef UnboundConversion Props;
- string_view Consume(string_view* src) {
+ std::pair<string_view, string_view> Consume(string_view src) {
int next = 0;
- const char* prev_begin = src->data();
o = UnboundConversion(); // refresh
- ConsumeUnboundConversion(src, &o, &next);
- return {prev_begin, static_cast<size_t>(src->data() - prev_begin)};
+ const char* p = ConsumeUnboundConversion(
+ src.data(), src.data() + src.size(), &o, &next);
+ if (!p) return {{}, src};
+ return {string_view(src.data(), p - src.data()),
+ string_view(p, src.data() + src.size() - p)};
}
bool Run(const char *fmt, bool force_positional = false) {
- string_view src = fmt;
int next = force_positional ? -1 : 0;
o = UnboundConversion(); // refresh
- return ConsumeUnboundConversion(&src, &o, &next) && src.empty();
+ return ConsumeUnboundConversion(fmt, fmt + strlen(fmt), &o, &next) ==
+ fmt + strlen(fmt);
}
UnboundConversion o;
};
@@ -104,11 +109,7 @@ TEST_F(ConsumeUnboundConversionTest, ConsumeSpecification) {
};
for (const auto& e : kExpect) {
SCOPED_TRACE(e.line);
- string_view src = e.src;
- EXPECT_EQ(e.src, src);
- string_view out = Consume(&src);
- EXPECT_EQ(e.out, out);
- EXPECT_EQ(e.src_post, src);
+ EXPECT_THAT(Consume(e.src), Pair(e.out, e.src_post));
}
}
diff --git a/absl/strings/numbers.cc b/absl/strings/numbers.cc
index 558c3396..38d14869 100644
--- a/absl/strings/numbers.cc
+++ b/absl/strings/numbers.cc
@@ -54,7 +54,7 @@ bool SimpleAtof(absl::string_view str, float* out) {
// not all non-whitespace characters consumed
return false;
}
- // from_chars() with DR 3801's current wording will return max() on
+ // from_chars() with DR 3081's current wording will return max() on
// overflow. SimpleAtof returns infinity instead.
if (result.ec == std::errc::result_out_of_range) {
if (*out > 1.0) {
@@ -80,7 +80,7 @@ bool SimpleAtod(absl::string_view str, double* out) {
// not all non-whitespace characters consumed
return false;
}
- // from_chars() with DR 3801's current wording will return max() on
+ // from_chars() with DR 3081's current wording will return max() on
// overflow. SimpleAtod returns infinity instead.
if (result.ec == std::errc::result_out_of_range) {
if (*out > 1.0) {