[libc] Mass replace enclosing namespace (llvm#67032)

This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079

Author: gchatelet

libc/benchmarks/CMakeLists.txt

@@ -162,7 +162,7 @@ function(add_libc_multi_impl_benchmark name)
         get_target_property(entrypoint_object_file ${fq_config_name} "OBJECT_FILE_RAW")
         target_link_libraries(${benchmark_name} PUBLIC json ${entrypoint_object_file})
         string(TOUPPER ${name} name_upper)
-        target_compile_definitions(${benchmark_name} PRIVATE "-DLIBC_BENCHMARK_FUNCTION_${name_upper}=__llvm_libc::${name}" "-DLIBC_BENCHMARK_FUNCTION_NAME=\"${fq_config_name}\"")
+        target_compile_definitions(${benchmark_name} PRIVATE "-DLIBC_BENCHMARK_FUNCTION_${name_upper}=LIBC_NAMESPACE::${name}" "-DLIBC_BENCHMARK_FUNCTION_NAME=\"${fq_config_name}\"")
         llvm_update_compile_flags(${benchmark_name})
     else()
       message(STATUS "Skipping benchmark for '${fq_config_name}' insufficient host cpu features '${required_cpu_features}'")

libc/benchmarks/LibcDefaultImplementations.cpp

@@ -2,7 +2,7 @@
 #include "llvm/ADT/ArrayRef.h"
 #include <cstddef>
 
-namespace __llvm_libc {
+namespace LIBC_NAMESPACE {
 
 extern void *memcpy(void *__restrict, const void *__restrict, size_t);
 extern void *memmove(void *, const void *, size_t);
@@ -11,7 +11,7 @@ extern void bzero(void *, size_t);
 extern int memcmp(const void *, const void *, size_t);
 extern int bcmp(const void *, const void *, size_t);
 
-} // namespace __llvm_libc
+} // namespace LIBC_NAMESPACE
 
 // List of implementations to test.
 
@@ -23,31 +23,31 @@ using llvm::libc_benchmarks::MemsetConfiguration;
 
 llvm::ArrayRef<MemcpyConfiguration> getMemcpyConfigurations() {
   static constexpr MemcpyConfiguration kMemcpyConfigurations[] = {
-      {__llvm_libc::memcpy, "__llvm_libc::memcpy"}};
+      {LIBC_NAMESPACE::memcpy, "LIBC_NAMESPACE::memcpy"}};
   return llvm::ArrayRef(kMemcpyConfigurations);
 }
 llvm::ArrayRef<MemmoveConfiguration> getMemmoveConfigurations() {
   static constexpr MemmoveConfiguration kMemmoveConfigurations[] = {
-      {__llvm_libc::memmove, "__llvm_libc::memmove"}};
+      {LIBC_NAMESPACE::memmove, "LIBC_NAMESPACE::memmove"}};
   return llvm::ArrayRef(kMemmoveConfigurations);
 }
 llvm::ArrayRef<MemcmpOrBcmpConfiguration> getMemcmpConfigurations() {
   static constexpr MemcmpOrBcmpConfiguration kMemcmpConfiguration[] = {
-      {__llvm_libc::memcmp, "__llvm_libc::memcmp"}};
+      {LIBC_NAMESPACE::memcmp, "LIBC_NAMESPACE::memcmp"}};
   return llvm::ArrayRef(kMemcmpConfiguration);
 }
 llvm::ArrayRef<MemcmpOrBcmpConfiguration> getBcmpConfigurations() {
   static constexpr MemcmpOrBcmpConfiguration kBcmpConfigurations[] = {
-      {__llvm_libc::bcmp, "__llvm_libc::bcmp"}};
+      {LIBC_NAMESPACE::bcmp, "LIBC_NAMESPACE::bcmp"}};
   return llvm::ArrayRef(kBcmpConfigurations);
 }
 llvm::ArrayRef<MemsetConfiguration> getMemsetConfigurations() {
   static constexpr MemsetConfiguration kMemsetConfigurations[] = {
-      {__llvm_libc::memset, "__llvm_libc::memset"}};
+      {LIBC_NAMESPACE::memset, "LIBC_NAMESPACE::memset"}};
   return llvm::ArrayRef(kMemsetConfigurations);
 }
 llvm::ArrayRef<BzeroConfiguration> getBzeroConfigurations() {
   static constexpr BzeroConfiguration kBzeroConfigurations[] = {
-      {__llvm_libc::bzero, "__llvm_libc::bzero"}};
+      {LIBC_NAMESPACE::bzero, "LIBC_NAMESPACE::bzero"}};
   return llvm::ArrayRef(kBzeroConfigurations);
 }

libc/benchmarks/LibcMemoryBenchmark.h

@@ -32,7 +32,7 @@ namespace libc_benchmarks {
 struct StudyConfiguration {
   // One of 'memcpy', 'memset', 'memcmp'.
   // The underlying implementation is always the llvm libc one.
-  // e.g. 'memcpy' will test '__llvm_libc::memcpy'
+  // e.g. 'memcpy' will test 'LIBC_NAMESPACE::memcpy'
   std::string Function;
 
   // The number of trials to run for this benchmark.

libc/benchmarks/LibcMemoryBenchmarkMain.cpp

@@ -21,7 +21,7 @@
 #include <cstring>
 #include <unistd.h>
 
-namespace __llvm_libc {
+namespace LIBC_NAMESPACE {
 
 extern void *memcpy(void *__restrict, const void *__restrict, size_t);
 extern void *memmove(void *, const void *, size_t);
@@ -30,7 +30,7 @@ extern void bzero(void *, size_t);
 extern int memcmp(const void *, const void *, size_t);
 extern int bcmp(const void *, const void *, size_t);
 
-} // namespace __llvm_libc
+} // namespace LIBC_NAMESPACE
 
 namespace llvm {
 namespace libc_benchmarks {

libc/benchmarks/automemcpy/lib/CodeGen.cpp

@@ -62,7 +62,7 @@ namespace functions {
 // static void memcpy_0xB20D4702493C397E(char *__restrict dst,
 //                                       const char *__restrict src,
 //                                       size_t size) {
-//   using namespace __llvm_libc::x86;
+//   using namespace LIBC_NAMESPACE::x86;
 //   if(size == 0) return;
 //   if(size == 1) return copy<_1>(dst, src);
 //   if(size < 4) return copy<HeadTail<_2>>(dst, src, size);
@@ -249,7 +249,7 @@ static raw_ostream &operator<<(raw_ostream &Stream,
   const auto &Ctx = FI.Ctx;
   Stream << "static " << Ctx.FunctionReturnType << ' ' << FI.Name
          << Ctx.FunctionArgs << " {\n";
-  Stream << kIndent << "using namespace __llvm_libc::" << FI.ElementClass
+  Stream << kIndent << "using namespace LIBC_NAMESPACE::" << FI.ElementClass
          << ";\n";
   for (const auto &I : FI.Individuals)
     if (I.Element.Size == 0)
@@ -428,7 +428,7 @@ namespace configurations {
 // ------------------------------------------------------------
 // e.g.
 // llvm::ArrayRef<MemcpyConfiguration> getMemcpyConfigurations() {
-//   using namespace __llvm_libc;
+//   using namespace LIBC_NAMESPACE;
 //   static constexpr MemcpyConfiguration kConfigurations[] = {
 //     {Wrap<memcpy_0xE00E29EE73994E2B>, "memcpy_0xE00E29EE73994E2B"},
 //     {Wrap<memcpy_0x8661D80472487AB5>, "memcpy_0x8661D80472487AB5"},
@@ -504,7 +504,7 @@ static raw_ostream &operator<<(raw_ostream &Stream, const Configuration &C) {
   if (C.Descriptors.empty())
     Stream << kIndent << "return {};\n";
   else {
-    Stream << kIndent << "using namespace __llvm_libc;\n";
+    Stream << kIndent << "using namespace LIBC_NAMESPACE;\n";
     Stream << kIndent << "static constexpr " << C.Type
            << " kConfigurations[] = {\n";
     Stream << C.Descriptors;
@@ -542,11 +542,11 @@ static void Serialize(raw_ostream &Stream,
   Stream << "using llvm::libc_benchmarks::MemmoveConfiguration;\n";
   Stream << "using llvm::libc_benchmarks::MemsetConfiguration;\n";
   Stream << "\n";
-  Stream << "namespace __llvm_libc {\n";
+  Stream << "namespace LIBC_NAMESPACE {\n";
   Stream << "\n";
   codegen::functions::Serialize(Stream, Descriptors);
   Stream << "\n";
-  Stream << "} // namespace __llvm_libc\n";
+  Stream << "} // namespace LIBC_NAMESPACE\n";
   Stream << "\n";
   Stream << "namespace llvm {\n";
   Stream << "namespace automemcpy {\n";

libc/benchmarks/automemcpy/unittests/CodeGenTest.cpp

@@ -63,14 +63,14 @@ using llvm::libc_benchmarks::MemcpyConfiguration;
 using llvm::libc_benchmarks::MemmoveConfiguration;
 using llvm::libc_benchmarks::MemsetConfiguration;
 
-namespace __llvm_libc {
+namespace LIBC_NAMESPACE {
 
 static void memcpy_0xE00E29EE73994E2B(char *__restrict dst, const char *__restrict src, size_t size) {
-  using namespace __llvm_libc::x86;
+  using namespace LIBC_NAMESPACE::x86;
   return copy<Accelerator>(dst, src, size);
 }
 static void memcpy_0x7381B60C7BE75EF9(char *__restrict dst, const char *__restrict src, size_t size) {
-  using namespace __llvm_libc::x86;
+  using namespace LIBC_NAMESPACE::x86;
   if(size == 0) return;
   if(size == 1) return copy<_1>(dst, src);
   if(size == 2) return copy<_2>(dst, src);
@@ -84,7 +84,7 @@ static void memcpy_0x7381B60C7BE75EF9(char *__restrict dst, const char *__restri
   return copy<Loop<_64>>(dst, src, size);
 }
 static int memcmp_0x348D7BA6DB0EE033(const char * lhs, const char * rhs, size_t size) {
-  using namespace __llvm_libc::x86;
+  using namespace LIBC_NAMESPACE::x86;
   if(size == 0) return 0;
   if(size == 1) return three_way_compare<_1>(lhs, rhs);
   if(size < 4) return three_way_compare<HeadTail<_2>>(lhs, rhs, size);
@@ -95,7 +95,7 @@ static int memcmp_0x348D7BA6DB0EE033(const char * lhs, const char * rhs, size_t
   return three_way_compare<Align<_16,Arg::Lhs>::Then<Loop<_16>>>(lhs, rhs, size);
 }
 static void memset_0x71E761699B999863(char * dst, int value, size_t size) {
-  using namespace __llvm_libc::x86;
+  using namespace LIBC_NAMESPACE::x86;
   if(size == 0) return;
   if(size == 1) return splat_set<_1>(dst, value);
   if(size < 4) return splat_set<HeadTail<_2>>(dst, value, size);
@@ -108,7 +108,7 @@ static void memset_0x71E761699B999863(char * dst, int value, size_t size) {
   return splat_set<Align<_16,Arg::Dst>::Then<Loop<_32>>>(dst, value, size);
 }
 static void memset_0x3DF0F44E2ED6A50F(char * dst, int value, size_t size) {
-  using namespace __llvm_libc::x86;
+  using namespace LIBC_NAMESPACE::x86;
   if(size == 0) return;
   if(size == 1) return splat_set<_1>(dst, value);
   if(size < 4) return splat_set<HeadTail<_2>>(dst, value, size);
@@ -121,7 +121,7 @@ static void memset_0x3DF0F44E2ED6A50F(char * dst, int value, size_t size) {
   return splat_set<Align<_32,Arg::Dst>::Then<Loop<_32>>>(dst, value, size);
 }
 static void bzero_0x475977492C218AD4(char * dst, size_t size) {
-  using namespace __llvm_libc::x86;
+  using namespace LIBC_NAMESPACE::x86;
   if(size == 0) return;
   if(size == 1) return splat_set<_1>(dst, 0);
   if(size == 2) return splat_set<_2>(dst, 0);
@@ -134,7 +134,7 @@ static void bzero_0x475977492C218AD4(char * dst, size_t size) {
   return splat_set<Align<_32,Arg::Dst>::Then<Loop<_32>>>(dst, 0, size);
 }
 
-} // namespace __llvm_libc
+} // namespace LIBC_NAMESPACE
 
 namespace llvm {
 namespace automemcpy {
@@ -163,7 +163,7 @@ void *Wrap(void *__restrict dst, const void *__restrict src, size_t size) {
   return dst;
 }
 llvm::ArrayRef<MemcpyConfiguration> getMemcpyConfigurations() {
-  using namespace __llvm_libc;
+  using namespace LIBC_NAMESPACE;
   static constexpr MemcpyConfiguration kConfigurations[] = {
     {Wrap<memcpy_0xE00E29EE73994E2B>, "memcpy_0xE00E29EE73994E2B"},
     {Wrap<memcpy_0x7381B60C7BE75EF9>, "memcpy_0x7381B60C7BE75EF9"},
@@ -178,7 +178,7 @@ int Wrap(const void *lhs, const void *rhs, size_t size) {
              reinterpret_cast<const char *>(rhs), size);
 }
 llvm::ArrayRef<MemcmpOrBcmpConfiguration> getMemcmpConfigurations() {
-  using namespace __llvm_libc;
+  using namespace LIBC_NAMESPACE;
   static constexpr MemcmpOrBcmpConfiguration kConfigurations[] = {
     {Wrap<memcmp_0x348D7BA6DB0EE033>, "memcmp_0x348D7BA6DB0EE033"},
   };
@@ -194,7 +194,7 @@ template <MemsetStub Foo> void *Wrap(void *dst, int value, size_t size) {
   return dst;
 }
 llvm::ArrayRef<MemsetConfiguration> getMemsetConfigurations() {
-  using namespace __llvm_libc;
+  using namespace LIBC_NAMESPACE;
   static constexpr MemsetConfiguration kConfigurations[] = {
     {Wrap<memset_0x71E761699B999863>, "memset_0x71E761699B999863"},
     {Wrap<memset_0x3DF0F44E2ED6A50F>, "memset_0x3DF0F44E2ED6A50F"},
@@ -207,7 +207,7 @@ template <BzeroStub Foo> void Wrap(void *dst, size_t size) {
   Foo(reinterpret_cast<char *>(dst), size);
 }
 llvm::ArrayRef<BzeroConfiguration> getBzeroConfigurations() {
-  using namespace __llvm_libc;
+  using namespace LIBC_NAMESPACE;
   static constexpr BzeroConfiguration kConfigurations[] = {
     {Wrap<bzero_0x475977492C218AD4>, "bzero_0x475977492C218AD4"},
   };

libc/config/linux/app.h

@@ -13,7 +13,7 @@
 
 #include <stdint.h>
 
-namespace __llvm_libc {
+namespace LIBC_NAMESPACE {
 
 // Data structure to capture properties of the linux/ELF TLS image.
 struct TLSImage {
@@ -106,6 +106,6 @@ void init_tls(TLSDescriptor &tls);
 // Cleanup the TLS area as described in |tls_descriptor|.
 void cleanup_tls(uintptr_t tls_addr, uintptr_t tls_size);
 
-} // namespace __llvm_libc
+} // namespace LIBC_NAMESPACE
 
 #endif // LLVM_LIBC_CONFIG_LINUX_APP_H

libc/docs/dev/clang_tidy_checks.rst

@@ -30,19 +30,19 @@ implementation-in-namespace
 ---------------------------
 
 It is part of our implementation standards that all implementation pieces live
-under the ``__llvm_libc`` namespace. This prevents pollution of the global
+under the ``LIBC_NAMESPACE`` namespace. This prevents pollution of the global
 namespace. Without a formal check to ensure this, an implementation might
 compile and pass unit tests, but not produce a usable libc function.
 
 This check that ensures any function call resolves to a function within the
-``__llvm_libc`` namespace.
+``LIBC_NAMESPACE`` namespace.
 
 .. code-block:: c++
 
     // Correct: implementation inside the correct namespace.
-    namespace __llvm_libc {
+    namespace LIBC_NAMESPACE {
         void LLVM_LIBC_ENTRYPOINT(strcpy)(char *dest, const char *src) {}
-        // Namespaces within __llvm_libc namespace are allowed.
+        // Namespaces within LIBC_NAMESPACE namespace are allowed.
         namespace inner{
             int localVar = 0;
         }
@@ -67,7 +67,7 @@ creates some uncertainty about which library a call resolves to especially when
 a public header with non-namespaced functions like ``string.h`` is included.
 
 This check ensures any function call resolves to a function within the
-__llvm_libc namespace.
+LIBC_NAMESPACE namespace.
 
 There are exceptions for the following functions: 
 ``__errno_location`` so that ``errno`` can be set;
@@ -76,10 +76,10 @@ are always external and can be intercepted.
 
 .. code-block:: c++
 
-    namespace __llvm_libc {
+    namespace LIBC_NAMESPACE {
 
     // Allow calls with the fully qualified name.
-    __llvm_libc::strlen("hello");
+    LIBC_NAMESPACE::strlen("hello");
 
     // Allow calls to compiler provided functions.
     (void)__builtin_abs(-1);
@@ -93,4 +93,4 @@ are always external and can be intercepted.
     // Allow calling into specific global functions (explained above)
     ::malloc(10);
 
-    } // namespace __llvm_libc
+    } // namespace LIBC_NAMESPACE

libc/docs/dev/code_style.rst

@@ -158,7 +158,7 @@ this:
 
    ...
 
-     __llvm_libc::AllocChecker ac;
+     LIBC_NAMESPACE::AllocChecker ac;
      auto *obj = new (ac) Type(...);
      if (!ac) {
        // handle allocator failure.

libc/docs/dev/implementation_standard.rst

@@ -33,17 +33,17 @@ example. The ``round`` function will be declared in an internal header file
     #ifndef LLVM_LIBC_SRC_MATH_ROUND_ROUND_H
     #define LLVM_LIBC_SRC_MATH_ROUND_ROUND_H
 
-    namespace __llvm_libc {
+    namespace LIBC_NAMESPACE {
 
     double round(double);
 
-    } // namespace __llvm_libc
+    } // namespace LIBC_NAMESPACE
 
     #endif LLVM_LIBC_SRC_MATH_ROUND_ROUND_H
 
 Notice that the ``round`` function declaration is nested inside the namespace
-``__llvm_libc``. All implementation constructs in LLVM-libc are declared within
-the namespace ``__llvm_libc``.
+``LIBC_NAMESPACE``. All implementation constructs in LLVM-libc are declared within
+the namespace ``LIBC_NAMESPACE``.
 
 ``.cpp`` File Structure
 -----------------------
@@ -55,13 +55,13 @@ the entrypoint function should make use of a special macro. For example, the
 
     // --- round.cpp --- //
 
-    namespace __llvm_libc {
+    namespace LIBC_NAMESPACE {
 
     double LLVM_LIBC_ENTRYPOINT(round)(double d) {
       // ... implementation goes here.
     }
 
-    } // namespace __llvm_libc
+    } // namespace LIBC_NAMESPACE
 
 Notice the use of the macro ``LLVM_LIBC_ENTRYPOINT``. This macro helps us define
 an C alias symbol for the C++ implementation. The C alias need not be added by