Changes imported from Abseil "staging" branch:

  - 1320147f7597a9490562d439ecea46faa1793a24 Support Hex formatting of pointers without forcing a cast... by Jorg Brown <jorg@google.com>
  - 13c793d6e14a52063c2d4ee327b6c976631b690e Add support for native WebAssembly llvm backend. by Abseil Team <absl-team@google.com>

GitOrigin-RevId: 1320147f7597a9490562d439ecea46faa1793a24
Change-Id: Ibd4dbf288903ab45387932e5b11a28f5accdf166

7 files changed, 45 insertions, 15 deletions

diff --git a/absl/base/config.h b/absl/base/config.h
index a387041d..87e403ad 100644
--- a/absl/base/config.h
+++ b/absl/base/config.h
@@ -250,6 +250,7 @@
 //   Windows                           _WIN32
 //   NaCL                              __native_client__
 //   AsmJS                             __asmjs__
+//   WebAssembly                       __wasm__
 //   Fuchsia                           __Fuchsia__
 //
 // Note that since Android defines both __ANDROID__ and __linux__, one
@@ -263,7 +264,7 @@
 #error ABSL_HAVE_MMAP cannot be directly set
 #elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) ||   \
     defined(__ros__) || defined(__native_client__) || defined(__asmjs__) || \
-    defined(__Fuchsia__)
+    defined(__wasm__) || defined(__Fuchsia__)
 #define ABSL_HAVE_MMAP 1
 #endif
 
diff --git a/absl/debugging/internal/elf_mem_image.h b/absl/debugging/internal/elf_mem_image.h
index 99350836..3b577268 100644
--- a/absl/debugging/internal/elf_mem_image.h
+++ b/absl/debugging/internal/elf_mem_image.h
@@ -30,7 +30,7 @@
 #endif
 
 #if defined(__ELF__) && defined(__GLIBC__) && !defined(__native_client__) && \
-    !defined(__asmjs__)
+    !defined(__asmjs__) && !defined(__wasm__)
 #define ABSL_HAVE_ELF_MEM_IMAGE 1
 #endif
 
diff --git a/absl/debugging/internal/stacktrace_config.h b/absl/debugging/internal/stacktrace_config.h
index ed82722b..48adfccc 100644
--- a/absl/debugging/internal/stacktrace_config.h
+++ b/absl/debugging/internal/stacktrace_config.h
@@ -26,7 +26,7 @@
 #error ABSL_STACKTRACE_INL_HEADER cannot be directly set
 #elif defined(__native_client__) || defined(__APPLE__) || \
     defined(__FreeBSD__) || defined(__ANDROID__) || defined(__myriad2__) || \
-    defined(__asmjs__) || defined(__Fuchsia__)
+    defined(__asmjs__) || defined(__wasm__) || defined(__Fuchsia__)
 #define ABSL_STACKTRACE_INL_HEADER \
     "absl/debugging/internal/stacktrace_unimplemented-inl.inc"
 
diff --git a/absl/debugging/internal/symbolize.h b/absl/debugging/internal/symbolize.h
index 802ea222..7ae13839 100644
--- a/absl/debugging/internal/symbolize.h
+++ b/absl/debugging/internal/symbolize.h
@@ -24,7 +24,7 @@
 #ifdef ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE
 #error ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE cannot be directly set
 #elif defined(__ELF__) && defined(__GLIBC__) && !defined(__native_client__) && \
-    !defined(__asmjs__)
+    !defined(__asmjs__) && !defined(__wasm__)
 #define ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE 1
 
 #include <elf.h>
diff --git a/absl/strings/str_cat.h b/absl/strings/str_cat.h
index 0c33b6cc..e38369ca 100644
--- a/absl/strings/str_cat.h
+++ b/absl/strings/str_cat.h
@@ -127,21 +127,32 @@ struct Hex {
   char fill;
 
   template <typename Int>
-  explicit Hex(Int v, PadSpec spec = absl::kNoPad,
-               typename std::enable_if<sizeof(Int) == 1>::type* = nullptr)
+  explicit Hex(
+      Int v, PadSpec spec = absl::kNoPad,
+      typename std::enable_if<sizeof(Int) == 1 &&
+                              !std::is_pointer<Int>::value>::type* = nullptr)
       : Hex(spec, static_cast<uint8_t>(v)) {}
   template <typename Int>
-  explicit Hex(Int v, PadSpec spec = absl::kNoPad,
-               typename std::enable_if<sizeof(Int) == 2>::type* = nullptr)
+  explicit Hex(
+      Int v, PadSpec spec = absl::kNoPad,
+      typename std::enable_if<sizeof(Int) == 2 &&
+                              !std::is_pointer<Int>::value>::type* = nullptr)
       : Hex(spec, static_cast<uint16_t>(v)) {}
   template <typename Int>
-  explicit Hex(Int v, PadSpec spec = absl::kNoPad,
-               typename std::enable_if<sizeof(Int) == 4>::type* = nullptr)
+  explicit Hex(
+      Int v, PadSpec spec = absl::kNoPad,
+      typename std::enable_if<sizeof(Int) == 4 &&
+                              !std::is_pointer<Int>::value>::type* = nullptr)
       : Hex(spec, static_cast<uint32_t>(v)) {}
   template <typename Int>
-  explicit Hex(Int v, PadSpec spec = absl::kNoPad,
-               typename std::enable_if<sizeof(Int) == 8>::type* = nullptr)
+  explicit Hex(
+      Int v, PadSpec spec = absl::kNoPad,
+      typename std::enable_if<sizeof(Int) == 8 &&
+                              !std::is_pointer<Int>::value>::type* = nullptr)
       : Hex(spec, static_cast<uint64_t>(v)) {}
+  template <typename Pointee>
+  explicit Hex(Pointee* v, PadSpec spec = absl::kNoPad)
+      : Hex(spec, reinterpret_cast<uintptr_t>(v)) {}
 
  private:
   Hex(PadSpec spec, uint64_t v)
diff --git a/absl/strings/str_cat_test.cc b/absl/strings/str_cat_test.cc
index 710113f8..c5a3526d 100644
--- a/absl/strings/str_cat_test.cc
+++ b/absl/strings/str_cat_test.cc
@@ -234,7 +234,7 @@ TEST(StrCat, CustomAllocator) {
 
 TEST(StrCat, MaxArgs) {
   std::string result;
-  // Test 10 up to 26 arguments, the current maximum
+  // Test 10 up to 26 arguments, the old maximum
   result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a");
   EXPECT_EQ(result, "123456789a");
   result = absl::StrCat(1, 2, 3, 4, 5, 6, 7, 8, 9, "a", "b");
@@ -469,6 +469,12 @@ void CheckHexDec64(uint64_t v) {
 
   long long llv = static_cast<long long>(ullv);  // NOLINT(runtime/int)
   CheckDec(llv, "%lld", "%0*lld", "%*lld");
+
+  if (sizeof(v) == sizeof(&v)) {
+    auto uintptr = static_cast<uintptr_t>(v);
+    void* ptr = reinterpret_cast<void*>(uintptr);
+    CheckHex(ptr, "%llx", "%0*llx", "%*llx");
+  }
 }
 
 void CheckHexDec32(uint32_t uv) {
@@ -476,6 +482,12 @@ void CheckHexDec32(uint32_t uv) {
   CheckDec(uv, "%u", "%0*u", "%*u");
   int32_t v = static_cast<int32_t>(uv);
   CheckDec(v, "%d", "%0*d", "%*d");
+
+  if (sizeof(v) == sizeof(&v)) {
+    auto uintptr = static_cast<uintptr_t>(v);
+    void* ptr = reinterpret_cast<void*>(uintptr);
+    CheckHex(ptr, "%llx", "%0*llx", "%*llx");
+  }
 }
 
 void CheckAll(uint64_t v) {
diff --git a/absl/strings/substitute_test.cc b/absl/strings/substitute_test.cc
index a6d7d7b0..7c9af6b2 100644
--- a/absl/strings/substitute_test.cc
+++ b/absl/strings/substitute_test.cc
@@ -46,8 +46,14 @@ TEST(SubstituteTest, Substitute) {
   // Pointer.
   const int* int_p = reinterpret_cast<const int*>(0x12345);
   std::string str = absl::Substitute("$0", int_p);
-  EXPECT_EQ(absl::StrCat("0x", absl::Hex(reinterpret_cast<intptr_t>(int_p))),
-            str);
+  EXPECT_EQ(absl::StrCat("0x", absl::Hex(int_p)), str);
+
+  // Volatile Pointer.
+  // Like C++ streamed I/O, such pointers implicitly become bool
+  volatile int vol = 237;
+  volatile int *volatile volptr = &vol;
+  str = absl::Substitute("$0", volptr);
+  EXPECT_EQ("true", str);
 
   // null is special. StrCat prints 0x0. Substitute prints NULL.
   const uint64_t* null_p = nullptr;