Move libstdc++ into libc.

The Android build system always links against libstdc++.so anyway. Having
operator new and operator delete in a separate library means we can't use
constructors and destructors on heap-allocated objects inside the C library,
which is quite an unfortunate limitation.

This will be cheaper too; on LP64 we can stop linking against the [now empty]
libstdc++.so giving the dynamic linker one less library to worry about for
every process.

There's precedent too --- we already have no libpthread or librt.

For now I'm leaving the include files where they are, and I'm generating a
dummy libstdc++.so and libstdc++.a. We can come back and clean that up later
if all goes well.

Bug: 13367666
Change-Id: I6f3e27ea7c30d03d6394965d0400c9dc87fa83db

4 files changed, 238 insertions, 0 deletions

diff --git a/libc/bionic/__cxa_guard.cpp b/libc/bionic/__cxa_guard.cpp
new file mode 100644
index 0000000..5b0d57d
--- /dev/null
+++ b/libc/bionic/__cxa_guard.cpp
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2006 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stddef.h>
+#include <endian.h>
+
+#include "private/bionic_atomic_inline.h"
+#include "private/bionic_futex.h"
+
+// This file contains C++ ABI support functions for one time
+// constructors as defined in the "Run-time ABI for the ARM Architecture"
+// section 4.4.2
+//
+// ARM C++ ABI and Itanium/x86 C++ ABI has different definition for
+// one time construction:
+//
+//    ARM C++ ABI defines the LSB of guard variable should be tested
+//    by compiler-generated code before calling __cxa_guard_acquire et al.
+//
+//    The Itanium/x86 C++ ABI defines the low-order _byte_ should be
+//    tested instead.
+//
+//    Meanwhile, guard variable are 32bit aligned for ARM, and 64bit
+//    aligned for x86.
+//
+// Reference documentation:
+//
+//    section 3.2.3 of ARM IHI 0041C (for ARM)
+//    section 3.3.2 of the Itanium C++ ABI specification v1.83 (for x86).
+//
+// There is no C++ ABI available for other ARCH. But the gcc source
+// shows all other ARCH follow the definition of Itanium/x86 C++ ABI.
+
+#if defined(__arm__)
+// The ARM C++ ABI mandates that guard variables are 32-bit aligned, 32-bit
+// values. The LSB is tested by the compiler-generated code before calling
+// __cxa_guard_acquire.
+union _guard_t {
+    int volatile state;
+    int32_t aligner;
+};
+
+const static int ready = 0x1;
+const static int pending = 0x2;
+const static int waiting = 0x6;
+
+#else
+// The Itanium/x86 C++ ABI (used by all other architectures) mandates that
+// guard variables are 64-bit aligned, 64-bit values. The LSB is tested by
+// the compiler-generated code before calling __cxa_guard_acquire.
+union _guard_t {
+    int volatile state;
+    int64_t aligner;
+};
+
+const static int ready     = letoh32(0x1);
+const static int pending   = letoh32(0x100);
+const static int waiting   = letoh32(0x10000);
+#endif
+
+extern "C" int __cxa_guard_acquire(_guard_t* gv) {
+    // 0 -> pending, return 1
+    // pending -> waiting, wait and return 0
+    // waiting: untouched, wait and return 0
+    // ready: untouched, return 0
+
+retry:
+    if (__bionic_cmpxchg(0, pending, &gv->state) == 0) {
+        ANDROID_MEMBAR_FULL();
+        return 1;
+    }
+    __bionic_cmpxchg(pending, waiting, &gv->state); // Indicate there is a waiter
+    __futex_wait(&gv->state, waiting, NULL);
+
+    if (gv->state != ready) {
+        // __cxa_guard_abort was called, let every thread try since there is no return code for this condition
+        goto retry;
+    }
+
+    ANDROID_MEMBAR_FULL();
+    return 0;
+}
+
+extern "C" void __cxa_guard_release(_guard_t* gv) {
+    // pending -> ready
+    // waiting -> ready, and wake
+
+    ANDROID_MEMBAR_FULL();
+    if (__bionic_cmpxchg(pending, ready, &gv->state) == 0) {
+        return;
+    }
+
+    gv->state = ready;
+    __futex_wake(&gv->state, 0x7fffffff);
+}
+
+extern "C" void __cxa_guard_abort(_guard_t* gv) {
+    ANDROID_MEMBAR_FULL();
+    gv->state= 0;
+    __futex_wake(&gv->state, 0x7fffffff);
+}
diff --git a/libc/bionic/__cxa_pure_virtual.cpp b/libc/bionic/__cxa_pure_virtual.cpp
new file mode 100644
index 0000000..30b581f
--- /dev/null
+++ b/libc/bionic/__cxa_pure_virtual.cpp
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <private/libc_logging.h>
+
+extern "C" void __cxa_pure_virtual() {
+  __libc_fatal("Pure virtual function called. Are you calling virtual methods from a destructor?");
+}
diff --git a/libc/bionic/new.cpp b/libc/bionic/new.cpp
new file mode 100644
index 0000000..cb19dfa
--- /dev/null
+++ b/libc/bionic/new.cpp
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <new>
+#include <stdlib.h>
+
+const std::nothrow_t std::nothrow = {};
+
+void* operator new(std::size_t size) {
+    void* p = malloc(size);
+    if (p == NULL) {
+        abort();
+    }
+    return p;
+}
+
+void* operator new[](std::size_t size) {
+    void* p = malloc(size);
+    if (p == NULL) {
+        abort();
+    }
+    return p;
+}
+
+void  operator delete(void* ptr) {
+    free(ptr);
+}
+
+void  operator delete[](void* ptr) {
+    free(ptr);
+}
+
+void* operator new(std::size_t size, const std::nothrow_t&) {
+    return malloc(size);
+}
+
+void* operator new[](std::size_t size, const std::nothrow_t&) {
+    return malloc(size);
+}
+
+void  operator delete(void* ptr, const std::nothrow_t&) {
+    free(ptr);
+}
+
+void  operator delete[](void* ptr, const std::nothrow_t&) {
+    free(ptr);
+}
diff --git a/libc/bionic/typeinfo.cpp b/libc/bionic/typeinfo.cpp
new file mode 100644
index 0000000..90180fb
--- /dev/null
+++ b/libc/bionic/typeinfo.cpp
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <typeinfo>
+#include <stdlib.h>
+
+type_info::type_info() {
+}
+
+type_info::~type_info() {
+}
+
+char const* type_info::name() const {
+  return "N/A";
+}
+
+bool type_info::operator==(type_info const& /*rhs*/) const {
+  return false;
+}
+
+bool type_info::operator!=(type_info const& /*rhs*/) const {
+  return false;
+}
+
+bool type_info::before(type_info const& /*rhs*/) const {
+  return false;
+}
+
+type_info::type_info(type_info const& /*rhs*/) {
+}