Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 231 insertions, 0 deletions

diff --git a/js/src/jit/arm64/vixl/Cpu-Features-vixl.cpp b/js/src/jit/arm64/vixl/Cpu-Features-vixl.cpp
new file mode 100644
index 0000000000..f31c22fbf5
--- /dev/null
+++ b/js/src/jit/arm64/vixl/Cpu-Features-vixl.cpp
@@ -0,0 +1,231 @@
+// Copyright 2018, VIXL authors
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//   * Redistributions of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//   * Redistributions in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//   * Neither the name of ARM Limited nor the names of its contributors may be
+//     used to endorse or promote products derived from this software without
+//     specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#include "jit/arm64/vixl/Cpu-Features-vixl.h"
+
+#include <ostream>
+
+#include "jit/arm64/vixl/Cpu-vixl.h"
+#include "jit/arm64/vixl/Globals-vixl.h"
+#include "jit/arm64/vixl/Utils-vixl.h"
+
+#define VIXL_USE_AARCH64_CPU_HELPERS
+
+namespace vixl {
+
+static uint64_t MakeFeatureMask(CPUFeatures::Feature feature) {
+  if (feature == CPUFeatures::kNone) {
+    return 0;
+  } else {
+    // Check that the shift is well-defined, and that the feature is valid.
+    VIXL_STATIC_ASSERT(CPUFeatures::kNumberOfFeatures <=
+                       (sizeof(uint64_t) * 8));
+    VIXL_ASSERT(feature < CPUFeatures::kNumberOfFeatures);
+    return UINT64_C(1) << feature;
+  }
+}
+
+CPUFeatures::CPUFeatures(Feature feature0,
+                         Feature feature1,
+                         Feature feature2,
+                         Feature feature3)
+    : features_(0) {
+  Combine(feature0, feature1, feature2, feature3);
+}
+
+CPUFeatures CPUFeatures::All() {
+  CPUFeatures all;
+  // Check that the shift is well-defined.
+  VIXL_STATIC_ASSERT(CPUFeatures::kNumberOfFeatures < (sizeof(uint64_t) * 8));
+  all.features_ = (UINT64_C(1) << kNumberOfFeatures) - 1;
+  return all;
+}
+
+CPUFeatures CPUFeatures::InferFromIDRegisters() {
+  // This function assumes that kIDRegisterEmulation is available.
+  CPUFeatures features(CPUFeatures::kIDRegisterEmulation);
+#ifdef VIXL_USE_AARCH64_CPU_HELPERS
+  // Note that the Linux kernel filters these values during emulation, so the
+  // results may not exactly match the expected hardware support.
+  features.Combine(CPU::InferCPUFeaturesFromIDRegisters());
+#endif
+  return features;
+}
+
+CPUFeatures CPUFeatures::InferFromOS(QueryIDRegistersOption option) {
+#ifdef VIXL_USE_AARCH64_CPU_HELPERS
+  return CPU::InferCPUFeaturesFromOS(option);
+#else
+  USE(option);
+  return CPUFeatures();
+#endif
+}
+
+void CPUFeatures::Combine(const CPUFeatures& other) {
+  features_ |= other.features_;
+}
+
+void CPUFeatures::Combine(Feature feature0,
+                          Feature feature1,
+                          Feature feature2,
+                          Feature feature3) {
+  features_ |= MakeFeatureMask(feature0);
+  features_ |= MakeFeatureMask(feature1);
+  features_ |= MakeFeatureMask(feature2);
+  features_ |= MakeFeatureMask(feature3);
+}
+
+void CPUFeatures::Remove(const CPUFeatures& other) {
+  features_ &= ~other.features_;
+}
+
+void CPUFeatures::Remove(Feature feature0,
+                         Feature feature1,
+                         Feature feature2,
+                         Feature feature3) {
+  features_ &= ~MakeFeatureMask(feature0);
+  features_ &= ~MakeFeatureMask(feature1);
+  features_ &= ~MakeFeatureMask(feature2);
+  features_ &= ~MakeFeatureMask(feature3);
+}
+
+CPUFeatures CPUFeatures::With(const CPUFeatures& other) const {
+  CPUFeatures f(*this);
+  f.Combine(other);
+  return f;
+}
+
+CPUFeatures CPUFeatures::With(Feature feature0,
+                              Feature feature1,
+                              Feature feature2,
+                              Feature feature3) const {
+  CPUFeatures f(*this);
+  f.Combine(feature0, feature1, feature2, feature3);
+  return f;
+}
+
+CPUFeatures CPUFeatures::Without(const CPUFeatures& other) const {
+  CPUFeatures f(*this);
+  f.Remove(other);
+  return f;
+}
+
+CPUFeatures CPUFeatures::Without(Feature feature0,
+                                 Feature feature1,
+                                 Feature feature2,
+                                 Feature feature3) const {
+  CPUFeatures f(*this);
+  f.Remove(feature0, feature1, feature2, feature3);
+  return f;
+}
+
+bool CPUFeatures::Has(const CPUFeatures& other) const {
+  return (features_ & other.features_) == other.features_;
+}
+
+bool CPUFeatures::Has(Feature feature0,
+                      Feature feature1,
+                      Feature feature2,
+                      Feature feature3) const {
+  uint64_t mask = MakeFeatureMask(feature0) | MakeFeatureMask(feature1) |
+                  MakeFeatureMask(feature2) | MakeFeatureMask(feature3);
+  return (features_ & mask) == mask;
+}
+
+size_t CPUFeatures::Count() const { return CountSetBits(features_); }
+
+std::ostream& operator<<(std::ostream& os, CPUFeatures::Feature feature) {
+  // clang-format off
+  switch (feature) {
+#define VIXL_FORMAT_FEATURE(SYMBOL, NAME, CPUINFO) \
+    case CPUFeatures::SYMBOL:                      \
+      return os << NAME;
+VIXL_CPU_FEATURE_LIST(VIXL_FORMAT_FEATURE)
+#undef VIXL_FORMAT_FEATURE
+    case CPUFeatures::kNone:
+      return os << "none";
+    case CPUFeatures::kNumberOfFeatures:
+      VIXL_UNREACHABLE();
+  }
+  // clang-format on
+  VIXL_UNREACHABLE();
+  return os;
+}
+
+CPUFeatures::const_iterator CPUFeatures::begin() const {
+  if (features_ == 0) return const_iterator(this, kNone);
+
+  int feature_number = CountTrailingZeros(features_);
+  vixl::CPUFeatures::Feature feature =
+      static_cast<CPUFeatures::Feature>(feature_number);
+  return const_iterator(this, feature);
+}
+
+CPUFeatures::const_iterator CPUFeatures::end() const {
+  return const_iterator(this, kNone);
+}
+
+std::ostream& operator<<(std::ostream& os, const CPUFeatures& features) {
+  CPUFeatures::const_iterator it = features.begin();
+  while (it != features.end()) {
+    os << *it;
+    ++it;
+    if (it != features.end()) os << ", ";
+  }
+  return os;
+}
+
+bool CPUFeaturesConstIterator::operator==(
+    const CPUFeaturesConstIterator& other) const {
+  VIXL_ASSERT(IsValid());
+  return (cpu_features_ == other.cpu_features_) && (feature_ == other.feature_);
+}
+
+CPUFeatures::Feature CPUFeaturesConstIterator::operator++() {  // Prefix
+  VIXL_ASSERT(IsValid());
+  do {
+    // Find the next feature. The order is unspecified.
+    feature_ = static_cast<CPUFeatures::Feature>(feature_ + 1);
+    if (feature_ == CPUFeatures::kNumberOfFeatures) {
+      feature_ = CPUFeatures::kNone;
+      VIXL_STATIC_ASSERT(CPUFeatures::kNone == -1);
+    }
+    VIXL_ASSERT(CPUFeatures::kNone <= feature_);
+    VIXL_ASSERT(feature_ < CPUFeatures::kNumberOfFeatures);
+    // cpu_features_->Has(kNone) is always true, so this will terminate even if
+    // the features list is empty.
+  } while (!cpu_features_->Has(feature_));
+  return feature_;
+}
+
+CPUFeatures::Feature CPUFeaturesConstIterator::operator++(int) {  // Postfix
+  CPUFeatures::Feature result = feature_;
+  ++(*this);
+  return result;
+}
+
+}  // namespace vixl