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From: Benjamin Barenblat <bbaren@google.com>
Subject: Remove endian-sensitivity from Abseil's RNG
Forwarded: yes
Applied-Upstream: https://github.com/abseil/abseil-cpp/commit/c36d825d9a5443f81d2656685ae021d6326da90c
Ensure that the Abseil random number generator produces identical output
on both big- and little-endian platforms by byte-swapping appropriately
on big-endian systems.
The author works at Google. Upstream applied this patch as Piper
revision 355635051 and exported it to GitHub; the Applied-Upstream URL
above points to the exported commit.
--- a/absl/base/BUILD.bazel
+++ b/absl/base/BUILD.bazel
@@ -479,6 +479,7 @@
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
+ ":base",
":config",
":core_headers",
],
--- a/absl/base/CMakeLists.txt
+++ b/absl/base/CMakeLists.txt
@@ -418,6 +418,7 @@
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
+ absl::base
absl::config
absl::core_headers
PUBLIC
--- a/absl/base/internal/endian.h
+++ b/absl/base/internal/endian.h
@@ -26,6 +26,7 @@
#endif
#include <cstdint>
+#include "absl/base/casts.h"
#include "absl/base/config.h"
#include "absl/base/internal/unaligned_access.h"
#include "absl/base/port.h"
@@ -173,6 +174,36 @@
#endif /* ENDIAN */
+inline uint8_t FromHost(uint8_t x) { return x; }
+inline uint16_t FromHost(uint16_t x) { return FromHost16(x); }
+inline uint32_t FromHost(uint32_t x) { return FromHost32(x); }
+inline uint64_t FromHost(uint64_t x) { return FromHost64(x); }
+inline uint8_t ToHost(uint8_t x) { return x; }
+inline uint16_t ToHost(uint16_t x) { return ToHost16(x); }
+inline uint32_t ToHost(uint32_t x) { return ToHost32(x); }
+inline uint64_t ToHost(uint64_t x) { return ToHost64(x); }
+
+inline int8_t FromHost(int8_t x) { return x; }
+inline int16_t FromHost(int16_t x) {
+ return bit_cast<int16_t>(FromHost16(bit_cast<uint16_t>(x)));
+}
+inline int32_t FromHost(int32_t x) {
+ return bit_cast<int32_t>(FromHost32(bit_cast<uint32_t>(x)));
+}
+inline int64_t FromHost(int64_t x) {
+ return bit_cast<int64_t>(FromHost64(bit_cast<uint64_t>(x)));
+}
+inline int8_t ToHost(int8_t x) { return x; }
+inline int16_t ToHost(int16_t x) {
+ return bit_cast<int16_t>(ToHost16(bit_cast<uint16_t>(x)));
+}
+inline int32_t ToHost(int32_t x) {
+ return bit_cast<int32_t>(ToHost32(bit_cast<uint32_t>(x)));
+}
+inline int64_t ToHost(int64_t x) {
+ return bit_cast<int64_t>(ToHost64(bit_cast<uint64_t>(x)));
+}
+
// Functions to do unaligned loads and stores in little-endian order.
inline uint16_t Load16(const void *p) {
return ToHost16(ABSL_INTERNAL_UNALIGNED_LOAD16(p));
@@ -233,6 +264,36 @@
#endif /* ENDIAN */
+inline uint8_t FromHost(uint8_t x) { return x; }
+inline uint16_t FromHost(uint16_t x) { return FromHost16(x); }
+inline uint32_t FromHost(uint32_t x) { return FromHost32(x); }
+inline uint64_t FromHost(uint64_t x) { return FromHost64(x); }
+inline uint8_t ToHost(uint8_t x) { return x; }
+inline uint16_t ToHost(uint16_t x) { return ToHost16(x); }
+inline uint32_t ToHost(uint32_t x) { return ToHost32(x); }
+inline uint64_t ToHost(uint64_t x) { return ToHost64(x); }
+
+inline int8_t FromHost(int8_t x) { return x; }
+inline int16_t FromHost(int16_t x) {
+ return bit_cast<int16_t>(FromHost16(bit_cast<uint16_t>(x)));
+}
+inline int32_t FromHost(int32_t x) {
+ return bit_cast<int32_t>(FromHost32(bit_cast<uint32_t>(x)));
+}
+inline int64_t FromHost(int64_t x) {
+ return bit_cast<int64_t>(FromHost64(bit_cast<uint64_t>(x)));
+}
+inline int8_t ToHost(int8_t x) { return x; }
+inline int16_t ToHost(int16_t x) {
+ return bit_cast<int16_t>(ToHost16(bit_cast<uint16_t>(x)));
+}
+inline int32_t ToHost(int32_t x) {
+ return bit_cast<int32_t>(ToHost32(bit_cast<uint32_t>(x)));
+}
+inline int64_t ToHost(int64_t x) {
+ return bit_cast<int64_t>(ToHost64(bit_cast<uint64_t>(x)));
+}
+
// Functions to do unaligned loads and stores in big-endian order.
inline uint16_t Load16(const void *p) {
return ToHost16(ABSL_INTERNAL_UNALIGNED_LOAD16(p));
--- a/absl/random/CMakeLists.txt
+++ b/absl/random/CMakeLists.txt
@@ -611,6 +611,7 @@
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::config
+ absl::endian
TESTONLY
)
@@ -758,6 +759,7 @@
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
+ absl::endian
absl::random_internal_iostream_state_saver
absl::random_internal_randen
absl::raw_logging_internal
@@ -1119,6 +1121,7 @@
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
+ absl::endian
absl::random_internal_randen_slow
gtest_main
)
--- a/absl/random/internal/BUILD.bazel
+++ b/absl/random/internal/BUILD.bazel
@@ -124,7 +124,10 @@
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
- deps = ["//absl/base:config"],
+ deps = [
+ "//absl/base:config",
+ "//absl/base:endian",
+ ],
)
cc_library(
@@ -241,6 +244,7 @@
deps = [
":iostream_state_saver",
":randen",
+ "//absl/base:endian",
"//absl/meta:type_traits",
],
)
@@ -606,6 +610,7 @@
":platform",
":randen_slow",
"@com_google_googletest//:gtest_main",
+ "//absl/base:endian",
],
)
--- a/absl/random/internal/explicit_seed_seq.h
+++ b/absl/random/internal/explicit_seed_seq.h
@@ -23,6 +23,7 @@
#include <vector>
#include "absl/base/config.h"
+#include "absl/base/internal/endian.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
@@ -73,7 +74,7 @@
template <typename OutIterator>
void generate(OutIterator begin, OutIterator end) {
for (size_t index = 0; begin != end; begin++) {
- *begin = state_.empty() ? 0 : state_[index++];
+ *begin = state_.empty() ? 0 : little_endian::FromHost32(state_[index++]);
if (index >= state_.size()) {
index = 0;
}
--- a/absl/random/internal/randen_engine.h
+++ b/absl/random/internal/randen_engine.h
@@ -23,6 +23,7 @@
#include <limits>
#include <type_traits>
+#include "absl/base/internal/endian.h"
#include "absl/meta/type_traits.h"
#include "absl/random/internal/iostream_state_saver.h"
#include "absl/random/internal/randen.h"
@@ -76,7 +77,7 @@
impl_.Generate(state_);
}
- return state_[next_++];
+ return little_endian::ToHost(state_[next_++]);
}
template <class SeedSequence>
@@ -181,7 +182,8 @@
// In the case that `elem` is `uint8_t`, it must be cast to something
// larger so that it prints as an integer rather than a character. For
// simplicity, apply the cast all circumstances.
- os << static_cast<numeric_type>(elem) << os.fill();
+ os << static_cast<numeric_type>(little_endian::FromHost(elem))
+ << os.fill();
}
os << engine.next_;
return os;
@@ -200,7 +202,7 @@
// necessary to read a wider type and then cast it to uint8_t.
numeric_type value;
is >> value;
- elem = static_cast<result_type>(value);
+ elem = little_endian::ToHost(static_cast<result_type>(value));
}
is >> next;
if (is.fail()) {
--- a/absl/random/internal/randen_slow_test.cc
+++ b/absl/random/internal/randen_slow_test.cc
@@ -17,6 +17,7 @@
#include <cstring>
#include "gtest/gtest.h"
+#include "absl/base/internal/endian.h"
#include "absl/random/internal/randen_traits.h"
namespace {
@@ -56,7 +57,7 @@
uint64_t* id = d.state;
for (const auto& elem : kGolden) {
- EXPECT_EQ(elem, *id++);
+ EXPECT_EQ(absl::little_endian::FromHost64(elem), *id++);
}
}
|
