Creation of LTS branch "lts_2019_08_08"20190808

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  - 253eb7416421661873afbaa33828a850db978541 [CMake] Set correct flags for clang-cl (#278) by Loo Rong Jie <loorongjie@gmail.com>
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  - c1cecb25a94c075725e9d2640f6b978a8f61957b Implement Span::first and Span::last from C++20 (#274) by Girts <girtsf@users.noreply.github.com>
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  - 89ea0c5ff34aaa5855cfc7aa41f323b8a0ef0ede Merge pull request #255 from uilianries/hotfix/conan by ahedberg <ahedberg@google.com>
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  - 6b4201f9ef650637510a21b8d6cbcc3bee4a606f Fix GCC8 warnings by Boris Staletic <boris.staletic@gmail.com>
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  - 9449ae94397f2fd683851348e25ed8c93f75b3b9 Merge pull request #243 from ThomsonTan/FixIntrinsic by Alex Strelnikov <strel@google.com>
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  - 3e2e9b5557e76d098de4b8a2a659125b98ca519b Merge pull request #231 from uilianries/feature/conan by Mark Barolak <mbxx@users.noreply.github.com>
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GitOrigin-RevId: 9ee91d3e430fb33a4590486573792eb0fa146c2d
Change-Id: Ia06e548bc106cc9d136f6c65714be6645317aced

20 files changed, 318 insertions, 252 deletions

diff --git a/absl/strings/internal/str_format/arg.cc b/absl/strings/internal/str_format/arg.cc
index e5e1eee5..667cc133 100644
--- a/absl/strings/internal/str_format/arg.cc
+++ b/absl/strings/internal/str_format/arg.cc
@@ -14,7 +14,7 @@
 #include "absl/strings/internal/str_format/float_conversion.h"
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 namespace {
 
@@ -375,5 +375,5 @@ ABSL_INTERNAL_FORMAT_DISPATCH_OVERLOADS_EXPAND_();
 
 }  // namespace str_format_internal
 
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
diff --git a/absl/strings/internal/str_format/arg.h b/absl/strings/internal/str_format/arg.h
index 0af4c839..b6f708c6 100644
--- a/absl/strings/internal/str_format/arg.h
+++ b/absl/strings/internal/str_format/arg.h
@@ -7,6 +7,7 @@
 #include <cstdio>
 #include <iomanip>
 #include <limits>
+#include <memory>
 #include <sstream>
 #include <string>
 #include <type_traits>
@@ -21,7 +22,7 @@ class Cord;
 class CordReader;
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 
 class FormatCountCapture;
 class FormatSink;
@@ -36,12 +37,14 @@ struct HasUserDefinedConvert<
     T, void_t<decltype(AbslFormatConvert(
            std::declval<const T&>(), std::declval<ConversionSpec>(),
            std::declval<FormatSink*>()))>> : std::true_type {};
+
 template <typename T>
 class StreamedWrapper;
 
 // If 'v' can be converted (in the printf sense) according to 'conv',
 // then convert it, appending to `sink` and return `true`.
 // Otherwise fail and return `false`.
+
 // Raw pointers.
 struct VoidPtr {
   VoidPtr() = default;
@@ -55,7 +58,8 @@ ConvertResult<Conv::p> FormatConvertImpl(VoidPtr v, ConversionSpec conv,
                                          FormatSinkImpl* sink);
 
 // Strings.
-ConvertResult<Conv::s> FormatConvertImpl(const std::string& v, ConversionSpec conv,
+ConvertResult<Conv::s> FormatConvertImpl(const std::string& v,
+                                         ConversionSpec conv,
                                          FormatSinkImpl* sink);
 ConvertResult<Conv::s> FormatConvertImpl(string_view v, ConversionSpec conv,
                                          FormatSinkImpl* sink);
@@ -81,7 +85,7 @@ ConvertResult<Conv::s> FormatConvertImpl(const AbslCord& value,
 
   int precision = conv.precision();
   if (precision >= 0)
-    to_write = std::min(to_write, static_cast<size_t>(precision));
+    to_write = (std::min)(to_write, static_cast<size_t>(precision));
 
   space_remaining = Excess(to_write, space_remaining);
 
@@ -290,7 +294,7 @@ class FormatArgImpl {
   struct Manager<T, ByPointer> {
     static Data SetValue(const T& value) {
       Data data;
-      data.ptr = &value;
+      data.ptr = std::addressof(value);
       return data;
     }
 
@@ -410,13 +414,13 @@ class FormatArgImpl {
   ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(double, __VA_ARGS__);             \
   ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(long double, __VA_ARGS__);        \
   ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(const char*, __VA_ARGS__);        \
-  ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(std::string, __VA_ARGS__);             \
+  ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(std::string, __VA_ARGS__);        \
   ABSL_INTERNAL_FORMAT_DISPATCH_INSTANTIATE_(string_view, __VA_ARGS__)
 
 ABSL_INTERNAL_FORMAT_DISPATCH_OVERLOADS_EXPAND_(extern);
 
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
 
 #endif  // ABSL_STRINGS_INTERNAL_STR_FORMAT_ARG_H_
diff --git a/absl/strings/internal/str_format/arg_test.cc b/absl/strings/internal/str_format/arg_test.cc
index 9cb9559c..c9c51951 100644
--- a/absl/strings/internal/str_format/arg_test.cc
+++ b/absl/strings/internal/str_format/arg_test.cc
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//      http://www.apache.org/licenses/LICENSE-2.0
+//      https://www.apache.org/licenses/LICENSE-2.0
 //
 #include "absl/strings/internal/str_format/arg.h"
 
@@ -14,7 +14,7 @@
 #include "absl/strings/str_format.h"
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 namespace {
 
@@ -109,5 +109,5 @@ const char kMyArray[] = "ABCDE";
 
 }  // namespace
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
diff --git a/absl/strings/internal/str_format/bind.cc b/absl/strings/internal/str_format/bind.cc
index 5cf026b6..48a306d4 100644
--- a/absl/strings/internal/str_format/bind.cc
+++ b/absl/strings/internal/str_format/bind.cc
@@ -6,7 +6,7 @@
 #include <string>
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 
 namespace {
@@ -26,12 +26,12 @@ class ArgContext {
   explicit ArgContext(absl::Span<const FormatArgImpl> pack) : pack_(pack) {}
 
   // Fill 'bound' with the results of applying the context's argument pack
-  // to the specified 'props'. We synthesize a BoundConversion by
+  // to the specified 'unbound'. We synthesize a BoundConversion by
   // lining up a UnboundConversion with a user argument. We also
   // resolve any '*' specifiers for width and precision, so after
   // this call, 'bound' has all the information it needs to be formatted.
   // Returns false on failure.
-  bool Bind(const UnboundConversion *props, BoundConversion *bound);
+  bool Bind(const UnboundConversion* unbound, BoundConversion* bound);
 
  private:
   absl::Span<const FormatArgImpl> pack_;
@@ -54,7 +54,8 @@ inline bool ArgContext::Bind(const UnboundConversion* unbound,
         // "A negative field width is taken as a '-' flag followed by a
         // positive field width."
         force_left = true;
-        width = -width;
+        // Make sure we don't overflow the width when negating it.
+        width = -std::max(width, -std::numeric_limits<int>::max());
       }
     }
 
@@ -160,7 +161,7 @@ bool BindWithPack(const UnboundConversion* props,
 }
 
 std::string Summarize(const UntypedFormatSpecImpl format,
-                 absl::Span<const FormatArgImpl> args) {
+                      absl::Span<const FormatArgImpl> args) {
   typedef SummarizingConverter Converter;
   std::string out;
   {
@@ -188,7 +189,7 @@ std::ostream& Streamable::Print(std::ostream& os) const {
 }
 
 std::string& AppendPack(std::string* out, const UntypedFormatSpecImpl format,
-                   absl::Span<const FormatArgImpl> args) {
+                        absl::Span<const FormatArgImpl> args) {
   size_t orig = out->size();
   if (ABSL_PREDICT_FALSE(!FormatUntyped(out, format, args))) {
     out->erase(orig);
@@ -227,5 +228,5 @@ int SnprintF(char* output, size_t size, const UntypedFormatSpecImpl format,
 }
 
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
diff --git a/absl/strings/internal/str_format/bind.h b/absl/strings/internal/str_format/bind.h
index df5562f6..db79eb6c 100644
--- a/absl/strings/internal/str_format/bind.h
+++ b/absl/strings/internal/str_format/bind.h
@@ -7,14 +7,13 @@
 #include <string>
 
 #include "absl/base/port.h"
-#include "absl/container/inlined_vector.h"
 #include "absl/strings/internal/str_format/arg.h"
 #include "absl/strings/internal/str_format/checker.h"
 #include "absl/strings/internal/str_format/parser.h"
 #include "absl/types/span.h"
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 
 class UntypedFormatSpec;
 
@@ -139,7 +138,17 @@ class Streamable {
  public:
   Streamable(const UntypedFormatSpecImpl& format,
              absl::Span<const FormatArgImpl> args)
-      : format_(format), args_(args.begin(), args.end()) {}
+      : format_(format) {
+    if (args.size() <= ABSL_ARRAYSIZE(few_args_)) {
+      for (size_t i = 0; i < args.size(); ++i) {
+        few_args_[i] = args[i];
+      }
+      args_ = absl::MakeSpan(few_args_, args.size());
+    } else {
+      many_args_.assign(args.begin(), args.end());
+      args_ = many_args_;
+    }
+  }
 
   std::ostream& Print(std::ostream& os) const;
 
@@ -149,12 +158,17 @@ class Streamable {
 
  private:
   const UntypedFormatSpecImpl& format_;
-  absl::InlinedVector<FormatArgImpl, 4> args_;
+  absl::Span<const FormatArgImpl> args_;
+  // if args_.size() is 4 or less:
+  FormatArgImpl few_args_[4] = {FormatArgImpl(0), FormatArgImpl(0),
+                                FormatArgImpl(0), FormatArgImpl(0)};
+  // if args_.size() is more than 4:
+  std::vector<FormatArgImpl> many_args_;
 };
 
 // for testing
 std::string Summarize(UntypedFormatSpecImpl format,
-                 absl::Span<const FormatArgImpl> args);
+                      absl::Span<const FormatArgImpl> args);
 bool BindWithPack(const UnboundConversion* props,
                   absl::Span<const FormatArgImpl> pack, BoundConversion* bound);
 
@@ -163,10 +177,10 @@ bool FormatUntyped(FormatRawSinkImpl raw_sink,
                    absl::Span<const FormatArgImpl> args);
 
 std::string& AppendPack(std::string* out, UntypedFormatSpecImpl format,
-                   absl::Span<const FormatArgImpl> args);
+                        absl::Span<const FormatArgImpl> args);
 
 inline std::string FormatPack(const UntypedFormatSpecImpl format,
-                         absl::Span<const FormatArgImpl> args) {
+                              absl::Span<const FormatArgImpl> args) {
   std::string out;
   AppendPack(&out, format, args);
   return out;
@@ -177,7 +191,7 @@ int FprintF(std::FILE* output, UntypedFormatSpecImpl format,
 int SnprintF(char* output, size_t size, UntypedFormatSpecImpl format,
              absl::Span<const FormatArgImpl> args);
 
-// Returned by Streamed(v). Converts via '%s' to the string created
+// Returned by Streamed(v). Converts via '%s' to the std::string created
 // by std::ostream << v.
 template <typename T>
 class StreamedWrapper {
@@ -193,7 +207,7 @@ class StreamedWrapper {
 };
 
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
 
 #endif  // ABSL_STRINGS_INTERNAL_STR_FORMAT_BIND_H_
diff --git a/absl/strings/internal/str_format/bind_test.cc b/absl/strings/internal/str_format/bind_test.cc
index 58d9e072..8bccc92a 100644
--- a/absl/strings/internal/str_format/bind_test.cc
+++ b/absl/strings/internal/str_format/bind_test.cc
@@ -1,24 +1,20 @@
 #include "absl/strings/internal/str_format/bind.h"
 
 #include <string.h>
+#include <limits>
 
 #include "gtest/gtest.h"
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 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);
   }
 };
 
@@ -92,6 +88,20 @@ TEST_F(FormatBindTest, BindSingle) {
   }
 }
 
+TEST_F(FormatBindTest, WidthUnderflowRegression) {
+  UnboundConversion props;
+  BoundConversion bound;
+  int next = 0;
+  const int args_i[] = {std::numeric_limits<int>::min(), 17};
+  const FormatArgImpl args[] = {FormatArgImpl(args_i[0]),
+                                FormatArgImpl(args_i[1])};
+  ASSERT_TRUE(Extract("*d", &props, &next));
+  ASSERT_TRUE(BindWithPack(&props, args, &bound));
+
+  EXPECT_EQ(bound.width(), std::numeric_limits<int>::max());
+  EXPECT_EQ(bound.arg(), args + 1);
+}
+
 TEST_F(FormatBindTest, FormatPack) {
   struct Expectation {
     int line;
@@ -129,5 +139,5 @@ TEST_F(FormatBindTest, FormatPack) {
 
 }  // namespace
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
diff --git a/absl/strings/internal/str_format/checker.h b/absl/strings/internal/str_format/checker.h
index d0191968..262887cd 100644
--- a/absl/strings/internal/str_format/checker.h
+++ b/absl/strings/internal/str_format/checker.h
@@ -15,7 +15,7 @@
 #endif  // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 
 constexpr bool AllOf() { return true; }
@@ -321,7 +321,7 @@ constexpr bool ValidFormatImpl(string_view format) {
 #endif  // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
 
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
 
 #endif  // ABSL_STRINGS_INTERNAL_STR_FORMAT_CHECKER_H_
diff --git a/absl/strings/internal/str_format/checker_test.cc b/absl/strings/internal/str_format/checker_test.cc
index b4f38979..2aa3b128 100644
--- a/absl/strings/internal/str_format/checker_test.cc
+++ b/absl/strings/internal/str_format/checker_test.cc
@@ -5,7 +5,7 @@
 #include "absl/strings/str_format.h"
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 namespace {
 
@@ -63,32 +63,32 @@ TEST(StrFormatChecker, ValidFormat) {
       ValidFormat<int>("%% %d"),                        //
       ValidFormat<int>("%ld"),                          //
       ValidFormat<int>("%lld"),                         //
-      ValidFormat<std::string>("%s"),                        //
-      ValidFormat<std::string>("%10s"),                      //
+      ValidFormat<std::string>("%s"),                   //
+      ValidFormat<std::string>("%10s"),                 //
       ValidFormat<int>("%.10x"),                        //
       ValidFormat<int, int>("%*.3x"),                   //
       ValidFormat<int>("%1.d"),                         //
       ValidFormat<int>("%.d"),                          //
       ValidFormat<int, double>("%d %g"),                //
-      ValidFormat<int, std::string>("%*s"),                  //
+      ValidFormat<int, std::string>("%*s"),             //
       ValidFormat<int, double>("%.*f"),                 //
       ValidFormat<void (*)(), volatile int*>("%p %p"),  //
       ValidFormat<string_view, const char*, double, void*>(
           "string_view=%s const char*=%s double=%f void*=%p)"),
 
-      ValidFormat<int>("%% %1$d"),            //
-      ValidFormat<int>("%1$ld"),              //
-      ValidFormat<int>("%1$lld"),             //
-      ValidFormat<std::string>("%1$s"),            //
-      ValidFormat<std::string>("%1$10s"),          //
-      ValidFormat<int>("%1$.10x"),            //
-      ValidFormat<int>("%1$*1$.*1$d"),        //
-      ValidFormat<int, int>("%1$*2$.3x"),     //
-      ValidFormat<int>("%1$1.d"),             //
-      ValidFormat<int>("%1$.d"),              //
-      ValidFormat<double, int>("%2$d %1$g"),  //
-      ValidFormat<int, std::string>("%2$*1$s"),    //
-      ValidFormat<int, double>("%2$.*1$f"),   //
+      ValidFormat<int>("%% %1$d"),               //
+      ValidFormat<int>("%1$ld"),                 //
+      ValidFormat<int>("%1$lld"),                //
+      ValidFormat<std::string>("%1$s"),          //
+      ValidFormat<std::string>("%1$10s"),        //
+      ValidFormat<int>("%1$.10x"),               //
+      ValidFormat<int>("%1$*1$.*1$d"),           //
+      ValidFormat<int, int>("%1$*2$.3x"),        //
+      ValidFormat<int>("%1$1.d"),                //
+      ValidFormat<int>("%1$.d"),                 //
+      ValidFormat<double, int>("%2$d %1$g"),     //
+      ValidFormat<int, std::string>("%2$*1$s"),  //
+      ValidFormat<int, double>("%2$.*1$f"),      //
       ValidFormat<void*, string_view, const char*, double>(
           "string_view=%2$s const char*=%3$s double=%4$f void*=%1$p "
           "repeat=%3$s)")};
@@ -100,25 +100,25 @@ TEST(StrFormatChecker, ValidFormat) {
   constexpr Case falses[] = {
       ValidFormat<int>(""),  //
 
-      ValidFormat<e>("%s"),             //
-      ValidFormat<e2>("%s"),            //
-      ValidFormat<>("%s"),              //
-      ValidFormat<>("%r"),              //
-      ValidFormat<int>("%s"),           //
-      ValidFormat<int>("%.1.d"),        //
-      ValidFormat<int>("%*1d"),         //
-      ValidFormat<int>("%1-d"),         //
+      ValidFormat<e>("%s"),                  //
+      ValidFormat<e2>("%s"),                 //
+      ValidFormat<>("%s"),                   //
+      ValidFormat<>("%r"),                   //
+      ValidFormat<int>("%s"),                //
+      ValidFormat<int>("%.1.d"),             //
+      ValidFormat<int>("%*1d"),              //
+      ValidFormat<int>("%1-d"),              //
       ValidFormat<std::string, int>("%*s"),  //
-      ValidFormat<int>("%*d"),          //
+      ValidFormat<int>("%*d"),               //
       ValidFormat<std::string>("%p"),        //
-      ValidFormat<int (*)(int)>("%d"),  //
-
-      ValidFormat<>("%3$d"),                //
-      ValidFormat<>("%1$r"),                //
-      ValidFormat<int>("%1$s"),             //
-      ValidFormat<int>("%1$.1.d"),          //
-      ValidFormat<int>("%1$*2$1d"),         //
-      ValidFormat<int>("%1$1-d"),           //
+      ValidFormat<int (*)(int)>("%d"),       //
+
+      ValidFormat<>("%3$d"),                     //
+      ValidFormat<>("%1$r"),                     //
+      ValidFormat<int>("%1$s"),                  //
+      ValidFormat<int>("%1$.1.d"),               //
+      ValidFormat<int>("%1$*2$1d"),              //
+      ValidFormat<int>("%1$1-d"),                //
       ValidFormat<std::string, int>("%2$*1$s"),  //
       ValidFormat<std::string>("%1$p"),
 
@@ -148,5 +148,5 @@ TEST(StrFormatChecker, LongFormat) {
 
 }  // namespace
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
diff --git a/absl/strings/internal/str_format/convert_test.cc b/absl/strings/internal/str_format/convert_test.cc
index 95d57b67..751bfc34 100644
--- a/absl/strings/internal/str_format/convert_test.cc
+++ b/absl/strings/internal/str_format/convert_test.cc
@@ -1,6 +1,7 @@
 #include <errno.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <cctype>
 #include <cmath>
 #include <string>
 
@@ -8,7 +9,7 @@
 #include "absl/strings/internal/str_format/bind.h"
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 namespace {
 
@@ -33,7 +34,9 @@ std::string LengthModFor(long long) { return "ll"; }           // NOLINT
 std::string LengthModFor(unsigned long long) { return "ll"; }  // NOLINT
 
 std::string EscCharImpl(int v) {
-  if (isprint(v)) return std::string(1, static_cast<char>(v));
+  if (std::isprint(static_cast<unsigned char>(v))) {
+    return std::string(1, static_cast<char>(v));
+  }
   char buf[64];
   int n = snprintf(buf, sizeof(buf), "\\%#.2x",
                    static_cast<unsigned>(v & 0xff));
@@ -156,7 +159,7 @@ TEST_F(FormatConvertTest, StringPrecision) {
 }
 
 TEST_F(FormatConvertTest, Pointer) {
-#if _MSC_VER
+#ifdef _MSC_VER
   // MSVC's printf implementation prints pointers differently. We can't easily
   // compare our implementation to theirs.
   return;
@@ -233,7 +236,7 @@ TEST_F(FormatConvertTest, Enum) {
 template <typename T>
 class TypedFormatConvertTest : public FormatConvertTest { };
 
-TYPED_TEST_CASE_P(TypedFormatConvertTest);
+TYPED_TEST_SUITE_P(TypedFormatConvertTest);
 
 std::vector<std::string> AllFlagCombinations() {
   const char kFlags[] = {'-', '#', '0', '+', ' '};
@@ -364,6 +367,18 @@ typedef ::testing::Types<
     AllIntTypes;
 INSTANTIATE_TYPED_TEST_CASE_P(TypedFormatConvertTestWithAllIntTypes,
                               TypedFormatConvertTest, AllIntTypes);
+
+TEST_F(FormatConvertTest, VectorBool) {
+  // Make sure vector<bool>'s values behave as bools.
+  std::vector<bool> v = {true, false};
+  const std::vector<bool> cv = {true, false};
+  EXPECT_EQ("1,0,1,0",
+            FormatPack(UntypedFormatSpecImpl("%d,%d,%d,%d"),
+                       absl::Span<const FormatArgImpl>(
+                           {FormatArgImpl(v[0]), FormatArgImpl(v[1]),
+                            FormatArgImpl(cv[0]), FormatArgImpl(cv[1])})));
+}
+
 TEST_F(FormatConvertTest, Uint128) {
   absl::uint128 v = static_cast<absl::uint128>(0x1234567890abcdef) * 1979;
   absl::uint128 max = absl::Uint128Max();
@@ -390,7 +405,7 @@ TEST_F(FormatConvertTest, Uint128) {
 }
 
 TEST_F(FormatConvertTest, Float) {
-#if _MSC_VER
+#ifdef _MSC_VER
   // MSVC has a different rounding policy than us so we can't test our
   // implementation against the native one there.
   return;
@@ -573,5 +588,5 @@ TEST_F(FormatConvertTest, ExpectedFailures) {
 
 }  // namespace
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
diff --git a/absl/strings/internal/str_format/extension.cc b/absl/strings/internal/str_format/extension.cc
index e3b41c82..1a0c4172 100644
--- a/absl/strings/internal/str_format/extension.cc
+++ b/absl/strings/internal/str_format/extension.cc
@@ -5,7 +5,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//      http://www.apache.org/licenses/LICENSE-2.0
+//      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ -20,7 +20,7 @@
 #include <string>
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 namespace {
 // clang-format off
@@ -82,5 +82,5 @@ bool FormatSinkImpl::PutPaddedString(string_view v, int w, int p, bool l) {
 }
 
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
diff --git a/absl/strings/internal/str_format/extension.h b/absl/strings/internal/str_format/extension.h
index d401b4ed..4fbe4a06 100644
--- a/absl/strings/internal/str_format/extension.h
+++ b/absl/strings/internal/str_format/extension.h
@@ -5,7 +5,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//      http://www.apache.org/licenses/LICENSE-2.0
+//      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ -13,7 +13,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-//
 #ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_
 #define ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_
 
@@ -29,7 +28,7 @@
 class Cord;
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 
 namespace str_format_internal {
 
@@ -361,7 +360,7 @@ enum class Conv : uint64_t {
   integral = d | i | u | o | x | X,
   floating = a | e | f | g | A | E | F | G,
   numeric = integral | floating,
-  string = s,  // absl:ignore(std::string)
+  string = s,
   pointer = p
 };
 
@@ -408,7 +407,7 @@ inline size_t Excess(size_t used, size_t capacity) {
 
 }  // namespace str_format_internal
 
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
 
 #endif  // ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_
diff --git a/absl/strings/internal/str_format/extension_test.cc b/absl/strings/internal/str_format/extension_test.cc
index 224fc923..4e23fefb 100644
--- a/absl/strings/internal/str_format/extension_test.cc
+++ b/absl/strings/internal/str_format/extension_test.cc
@@ -5,7 +5,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//      http://www.apache.org/licenses/LICENSE-2.0
+//      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ -18,6 +18,7 @@
 
 #include <random>
 #include <string>
+
 #include "absl/strings/str_format.h"
 
 #include "gtest/gtest.h"
diff --git a/absl/strings/internal/str_format/float_conversion.cc b/absl/strings/internal/str_format/float_conversion.cc
index 7b617689..a0484feb 100644
--- a/absl/strings/internal/str_format/float_conversion.cc
+++ b/absl/strings/internal/str_format/float_conversion.cc
@@ -6,8 +6,10 @@
 #include <cmath>
 #include <string>
 
+#include "absl/base/config.h"
+
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 
 namespace {
@@ -335,7 +337,7 @@ bool FloatToBuffer(Decomposed<Float> decomposed, int precision, Buffer *out,
           static_cast<std::uint64_t>(decomposed.exponent), precision, out, exp))
     return true;
 
-#if defined(__SIZEOF_INT128__)
+#if defined(ABSL_HAVE_INTRINSIC_INT128)
   // If that is not enough, try with __uint128_t.
   return CanFitMantissa<Float, __uint128_t>() &&
          FloatToBufferImpl<__uint128_t, Float, mode>(
@@ -481,5 +483,5 @@ bool ConvertFloatImpl(double v, const ConversionSpec &conv,
 }
 
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
diff --git a/absl/strings/internal/str_format/float_conversion.h b/absl/strings/internal/str_format/float_conversion.h
index 280c471a..5d76ce2b 100644
--- a/absl/strings/internal/str_format/float_conversion.h
+++ b/absl/strings/internal/str_format/float_conversion.h
@@ -4,7 +4,7 @@
 #include "absl/strings/internal/str_format/extension.h"
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 
 bool ConvertFloatImpl(float v, const ConversionSpec &conv,
@@ -17,7 +17,7 @@ bool ConvertFloatImpl(long double v, const ConversionSpec &conv,
                       FormatSinkImpl *sink);
 
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
 
 #endif  // ABSL_STRINGS_INTERNAL_STR_FORMAT_FLOAT_CONVERSION_H_
diff --git a/absl/strings/internal/str_format/output.cc b/absl/strings/internal/str_format/output.cc
index 010bf341..d5ead8d5 100644
--- a/absl/strings/internal/str_format/output.cc
+++ b/absl/strings/internal/str_format/output.cc
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//      http://www.apache.org/licenses/LICENSE-2.0
+//      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ -18,7 +18,7 @@
 #include <cstring>
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 
 namespace {
@@ -68,5 +68,5 @@ void FILERawSink::Write(string_view v) {
 }
 
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
diff --git a/absl/strings/internal/str_format/output.h b/absl/strings/internal/str_format/output.h
index 0f3ab349..ba847471 100644
--- a/absl/strings/internal/str_format/output.h
+++ b/absl/strings/internal/str_format/output.h
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//      http://www.apache.org/licenses/LICENSE-2.0
+//      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ -31,7 +31,7 @@
 class Cord;
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 
 // RawSink implementation that writes into a char* buffer.
@@ -97,7 +97,7 @@ auto InvokeFlush(T* out, string_view s)
 }
 
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
 
 #endif  // ABSL_STRINGS_INTERNAL_STR_FORMAT_OUTPUT_H_
diff --git a/absl/strings/internal/str_format/output_test.cc b/absl/strings/internal/str_format/output_test.cc
index 0a014cac..5c3c4afb 100644
--- a/absl/strings/internal/str_format/output_test.cc
+++ b/absl/strings/internal/str_format/output_test.cc
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//      http://www.apache.org/licenses/LICENSE-2.0
+//      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ -17,24 +17,17 @@
 #include <sstream>
 #include <string>
 
-
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace {
 
 TEST(InvokeFlush, String) {
   std::string str = "ABC";
   str_format_internal::InvokeFlush(&str, "DEF");
   EXPECT_EQ(str, "ABCDEF");
-
-#if UTIL_FORMAT_HAS_GLOBAL_STRING
-  std::string str2 = "ABC";
-  str_format_internal::InvokeFlush(&str2, "DEF");
-  EXPECT_EQ(str2, "ABCDEF");
-#endif  // UTIL_FORMAT_HAS_GLOBAL_STRING
 }
 
 TEST(InvokeFlush, Stream) {
@@ -75,6 +68,6 @@ TEST(BufferRawSink, Limits) {
 }
 
 }  // namespace
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
 
diff --git a/absl/strings/internal/str_format/parser.cc b/absl/strings/internal/str_format/parser.cc
index 119a711e..4b8ca4d2 100644
--- a/absl/strings/internal/str_format/parser.cc
+++ b/absl/strings/internal/str_format/parser.cc
@@ -14,8 +14,46 @@
 #include <unordered_set>
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 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) {
@@ -37,60 +75,17 @@ 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 = [&] {
@@ -100,10 +95,11 @@ bool ConsumeConversion(string_view *src, UnboundConversion *conv,
     // digit doesn't match the expected characters.
     int num_digits = std::numeric_limits<int>::digits10;
     for (;;) {
-      if (ABSL_PREDICT_FALSE(pos == end || !num_digits)) break;
+      if (ABSL_PREDICT_FALSE(pos == end)) break;
       c = *pos++;
       if (!std::isdigit(c)) break;
       --num_digits;
+      if (ABSL_PREDICT_FALSE(!num_digits)) break;
       digits = 10 * digits + c - '0';
     }
     return digits;
@@ -111,10 +107,10 @@ 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 +125,9 @@ 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 +155,20 @@ 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 != '$')) return nullptr;
           ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
         } else {
           conv->width.set_from_arg(++*next_arg);
@@ -188,9 +183,9 @@ flags_done:
       } else if (c == '*') {
         ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
         if (is_positional) {
-          if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return false;
+          if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return nullptr;
           conv->precision.set_from_arg(parse_digits());
-          if (c != '$') return false;
+          if (c != '$') return nullptr;
           ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
         } else {
           conv->precision.set_from_arg(++*next_arg);
@@ -201,14 +196,14 @@ 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 +214,24 @@ 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 {
@@ -307,5 +301,5 @@ bool ParsedFormatBase::MatchesConversions(
 }
 
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
diff --git a/absl/strings/internal/str_format/parser.h b/absl/strings/internal/str_format/parser.h
index 9842c117..d3357fde 100644
--- a/absl/strings/internal/str_format/parser.h
+++ b/absl/strings/internal/str_format/parser.h
@@ -16,7 +16,7 @@
 #include "absl/strings/internal/str_format/extension.h"
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 
 // The analyzed properties of a single specified conversion.
@@ -64,17 +64,45 @@ 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'.
@@ -89,51 +117,53 @@ 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;
@@ -288,7 +318,7 @@ class ExtendedParsedFormat : public str_format_internal::ParsedFormatBase {
       : ParsedFormatBase(s, allow_ignored, {C...}) {}
 };
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl
 
 #endif  // ABSL_STRINGS_INTERNAL_STR_FORMAT_PARSER_H_
diff --git a/absl/strings/internal/str_format/parser_test.cc b/absl/strings/internal/str_format/parser_test.cc
index 14d90344..d77a8ea5 100644
--- a/absl/strings/internal/str_format/parser_test.cc
+++ b/absl/strings/internal/str_format/parser_test.cc
@@ -1,15 +1,19 @@
 #include "absl/strings/internal/str_format/parser.h"
 
 #include <string.h>
+
+#include "gmock/gmock.h"
 #include "gtest/gtest.h"
 #include "absl/base/macros.h"
 
 namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
 namespace str_format_internal {
 
 namespace {
 
+using testing::Pair;
+
 TEST(LengthModTest, Names) {
   struct Expectation {
     int line;
@@ -64,20 +68,21 @@ 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;
 };
@@ -105,11 +110,7 @@ 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));
   }
 }
 
@@ -247,6 +248,8 @@ TEST_F(ConsumeUnboundConversionTest, WidthAndPrecision) {
 
   EXPECT_FALSE(Run("1000000000.999999999d"));
   EXPECT_FALSE(Run("999999999.1000000000d"));
+  EXPECT_FALSE(Run("9999999999d"));
+  EXPECT_FALSE(Run(".9999999999d"));
 }
 
 TEST_F(ConsumeUnboundConversionTest, Flags) {
@@ -387,5 +390,5 @@ TEST_F(ParsedFormatTest, ParsingFlagOrder) {
 
 }  // namespace
 }  // namespace str_format_internal
-}  // inline namespace lts_2018_12_18
+}  // inline namespace lts_2019_08_08
 }  // namespace absl