Export of internal Abseil changes

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167cd2647144583746311129b0cc98a89a9897e1 by Andy Soffer <asoffer@google.com>:

Internal Changes

PiperOrigin-RevId: 268000987

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ab44fea7dfdaf763c69609a08ddfac22480ce520 by Derek Mauro <dmauro@google.com>:

Fix flags Cmake tests on Windows

PiperOrigin-RevId: 267859442

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d7ec9f7611370b01bc9a5aed7e18460df2a15429 by Abseil Team <absl-team@google.com>:

Fix undefined behavior in symbolize_elf.inc

PiperOrigin-RevId: 267684904

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e7c5f8e472a91ed99bdf4876942f2bda5751aa6c by Abseil Team <absl-team@google.com>:

Turn off ABSL_HAS_ALARM on Fuchsia.

PiperOrigin-RevId: 267666090

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b7d25d5c71a49e697a8bf6440ed30f2e3f036420 by Chris Kennelly <ckennelly@google.com>:

Mark once initialization function as no inline.

We expect this code to run infrequently.

PiperOrigin-RevId: 267649713

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dc2a5e5f1e39a03fff837d34a319033fde55d9ba by Derek Mauro <dmauro@google.com>:

Fix the MSVC CMake random build

PiperOrigin-RevId: 267624074

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ba2751b67fa17d1b6c53e5ba79f81a5371e4a03a by Abseil Team <absl-team@google.com>:

Move "internal/flag.*" files to the "internal" build target.

PiperOrigin-RevId: 267588996

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05b985a33eec4f8acff1809ad9218a1e22220f34 by Abseil Team <absl-team@google.com>:

Move "internal/flag.*" files to the "internal" build target.

PiperOrigin-RevId: 267580412
GitOrigin-RevId: 167cd2647144583746311129b0cc98a89a9897e1
Change-Id: Ibd334f46a5671c7c1d3fcf5354029e2fbb7ba91f

absl/random/CMakeLists.txt

@@ -1025,6 +1025,8 @@ absl_cc_test(
     random_internal_iostream_state_saver_test
   SRCS
     "internal/iostream_state_saver_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
   LINKOPTS
     ${ABSL_DEFAULT_LINKOPTS}
   DEPS

absl/random/beta_distribution.h

@@ -129,7 +129,7 @@ class beta_distribution {
    private:
     friend class beta_distribution;
 
-#ifdef COMPILER_MSVC
+#ifdef _MSC_VER
     // MSVC does not have constexpr implementations for std::log and std::exp
     // so they are computed at runtime.
 #define ABSL_RANDOM_INTERNAL_LOG_EXP_CONSTEXPR

absl/random/distribution_format_traits.h

@@ -36,6 +36,12 @@
 #include "absl/types/span.h"
 
 namespace absl {
+
+struct IntervalClosedClosedTag;
+struct IntervalClosedOpenTag;
+struct IntervalOpenClosedTag;
+struct IntervalOpenOpenTag;
+
 namespace random_internal {
 
 // ScalarTypeName defines a preferred hierarchy of preferred type names for
@@ -243,6 +249,39 @@ struct DistributionFormatTraits<absl::log_uniform_int_distribution<R>> {
   }
 };
 
+template <typename TagType, typename NumType>
+struct UniformDistributionWrapper;
+
+template <typename TagType, typename NumType>
+struct DistributionFormatTraits<UniformDistributionWrapper<TagType, NumType>> {
+  using distribution_t = UniformDistributionWrapper<TagType, NumType>;
+  using result_t = NumType;
+
+  static constexpr const char* Name() { return "Uniform"; }
+
+  static std::string FunctionName() {
+    return absl::StrCat(Name(), "<", ScalarTypeName<NumType>(), ">");
+  }
+  static std::string FormatArgs(const distribution_t& d) {
+    absl::string_view tag;
+    if (std::is_same<TagType, IntervalClosedClosedTag>::value) {
+      tag = "IntervalClosedClosed";
+    } else if (std::is_same<TagType, IntervalClosedOpenTag>::value) {
+      tag = "IntervalClosedOpen";
+    } else if (std::is_same<TagType, IntervalOpenClosedTag>::value) {
+      tag = "IntervalOpenClosed";
+    } else if (std::is_same<TagType, IntervalOpenOpenTag>::value) {
+      tag = "IntervalOpenOpen";
+    } else {
+      tag = "[[unknown tag type]]";
+    }
+    return absl::StrCat(tag, ", ", (d.min)(), ", ", (d.max)());
+  }
+  static std::string FormatResults(absl::Span<const result_t> results) {
+    return absl::StrJoin(results, ", ");
+  }
+};
+
 }  // namespace random_internal
 }  // namespace absl
 

absl/random/internal/BUILD.bazel

@@ -60,13 +60,11 @@ cc_library(
     linkopts = ABSL_DEFAULT_LINKOPTS,
     deps = [
         ":distribution_caller",
-        ":fast_uniform_bits",
-        ":fastmath",
         ":traits",
         ":uniform_helper",
+        "//absl/base",
         "//absl/meta:type_traits",
         "//absl/strings",
-        "//absl/types:span",
     ],
 )
 
@@ -618,11 +616,6 @@ cc_library(
     copts = ABSL_DEFAULT_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
     deps = [
-        ":distribution_impl",
-        ":fast_uniform_bits",
-        ":iostream_state_saver",
-        ":traits",
-        "//absl/base:core_headers",
         "//absl/meta:type_traits",
     ],
 )

absl/random/internal/distributions.h

@@ -39,22 +39,20 @@ NumType UniformImpl(TagType tag,
       "absl::Uniform<T>() must use an integer or real parameter type.");
 
   using distribution_t =
-      typename std::conditional<std::is_integral<NumType>::value,
-                                absl::uniform_int_distribution<NumType>,
-                                absl::uniform_real_distribution<NumType>>::type;
+      UniformDistributionWrapper<absl::decay_t<TagType>, NumType>;
   using format_t = random_internal::DistributionFormatTraits<distribution_t>;
+  auto a = uniform_lower_bound(tag, lo, hi);
+  auto b = uniform_upper_bound(tag, lo, hi);
 
-  auto a = random_internal::uniform_lower_bound<NumType>(tag, lo, hi);
-  auto b = random_internal::uniform_upper_bound<NumType>(tag, lo, hi);
   // TODO(lar): it doesn't make a lot of sense to ask for a random number in an
   // empty range.  Right now we just return a boundary--even though that
   // boundary is not an acceptable value!  Is there something better we can do
   // here?
+  if (a > b) return a;
 
   using gen_t = absl::decay_t<URBG>;
-  if (a > b) return a;
   return DistributionCaller<gen_t>::template Call<distribution_t, format_t>(
-      &urbg, a, b);
+      &urbg, tag, lo, hi);
 }
 
 // In the absence of an explicitly provided return-type, the template

absl/random/internal/uniform_helper.h

@@ -156,7 +156,7 @@ using UniformDistribution =
 
 template <typename TagType, typename NumType>
 struct UniformDistributionWrapper : public UniformDistribution<NumType> {
-  explicit UniformDistributionWrapper(NumType lo, NumType hi)
+  explicit UniformDistributionWrapper(TagType, NumType lo, NumType hi)
       : UniformDistribution<NumType>(
             uniform_lower_bound<NumType>(TagType{}, lo, hi),
             uniform_upper_bound<NumType>(TagType{}, lo, hi)) {}