Illustrate a redirector using the example of round function from math.h.

Setup demonstrated in this patch is only for ELF-ish platforms.

Also note:

1. Use of redirectors is a temporary scheme. They will be removed once
   LLVM-libc has implementations for the redirected functions.
2. Redirectors are optional. One can choose to not include them in the
   LLVM-libc build for their platform.
3. Even with redirectors used, we want to link to the system libc
   dynamically.

Reviewers: dlj, hfinkel, jakehehrlich, phosek, stanshebs, theraven, alexshap

Subscribers: mgorny, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D69020

11 files changed, 247 insertions, 5 deletions

diff --git a/libc/cmake/modules/LLVMLibCRules.cmake b/libc/cmake/modules/LLVMLibCRules.cmake
index 026cd38a3ef..f35afdc2db1 100644
--- a/libc/cmake/modules/LLVMLibCRules.cmake
+++ b/libc/cmake/modules/LLVMLibCRules.cmake
@@ -100,6 +100,7 @@ set(ENTRYPOINT_OBJ_TARGET_TYPE "ENTRYPOINT_OBJ")
 # Usage:
 #     add_entrypoint_object(
 #       <target_name>
+#       [REDIRECTED] # Specified if the entrypoint is redirected.
 #       SRCS <list of .cpp files>
 #       HDRS <list of .h files>
 #       DEPENDS <list of dependencies>
@@ -107,7 +108,7 @@ set(ENTRYPOINT_OBJ_TARGET_TYPE "ENTRYPOINT_OBJ")
 function(add_entrypoint_object target_name)
   cmake_parse_arguments(
     "ADD_ENTRYPOINT_OBJ"
-    "" # No optional arguments
+    "REDIRECTED" # Optional argument
     "" # No single value arguments
     "SRCS;HDRS;DEPENDS"  # Multi value arguments
     ${ARGN}
@@ -131,7 +132,7 @@ function(add_entrypoint_object target_name)
     ${target_name}_objects
     BEFORE
     PRIVATE
-      -fpie -std=${LLVM_CXX_STD_default}
+      -fpie ${LLVM_CXX_STD_default}
   )
   target_include_directories(
     ${target_name}_objects
@@ -158,10 +159,16 @@ function(add_entrypoint_object target_name)
     COMMAND ${CMAKE_LINKER} -r $<TARGET_OBJECTS:${target_name}_objects> -o ${object_file_raw}
   )
 
+  set(alias_attributes "0,function,global")
+  if(ADD_ENTRYPOINT_OBJ_REDIRECTED)
+    set(alias_attributes "${alias_attributes},hidden")
+  endif()
+
   add_custom_command(
     OUTPUT ${object_file}
-    DEPENDS ${object_file_raw}
-    COMMAND ${CMAKE_OBJCOPY} --add-symbol "${target_name}=.llvm.libc.entrypoint.${target_name}:0,function,weak,global" ${object_file_raw} ${object_file}
+    # We llvm-objcopy here as GNU-binutils objcopy does not support the 'hidden' flag.
+    DEPENDS ${object_file_raw} ${llvm-objcopy}
+    COMMAND $<TARGET_FILE:llvm-objcopy> --add-symbol "${target_name}=.llvm.libc.entrypoint.${target_name}:${alias_attributes}" ${object_file_raw} ${object_file}
   )
 
   add_custom_target(
@@ -219,6 +226,67 @@ function(add_entrypoint_library target_name)
   )
 endfunction(add_entrypoint_library)
 
+# Rule build a redirector object file.
+function(add_redirector_object target_name)
+  cmake_parse_arguments(
+    "REDIRECTOR_OBJECT"
+    "" # No optional arguments
+    "SRC" # The cpp file in which the redirector is defined.
+    "" # No multivalue arguments
+    ${ARGN}
+  )
+  if(NOT REDIRECTOR_OBJECT_SRC)
+    message(FATAL_ERROR "'add_redirector_object' rule requires SRC option listing one source file.")
+  endif()
+
+  add_library(
+    ${target_name}
+    OBJECT
+    ${REDIRECTOR_OBJECT_SRC}
+  )
+  target_compile_options(
+    ${target_name}
+    BEFORE PRIVATE -fPIC
+  )
+endfunction(add_redirector_object)
+
+# Rule to build a shared library of redirector objects
+function(add_redirector_library target_name)
+  cmake_parse_arguments(
+    "REDIRECTOR_LIBRARY"
+    ""
+    ""
+    "DEPENDS"
+    ${ARGN}
+  )
+
+  set(obj_files "")
+  foreach(dep IN LISTS REDIRECTOR_LIBRARY_DEPENDS)
+    # TODO: Ensure that each dep is actually a add_redirector_object target.
+    list(APPEND obj_files $<TARGET_OBJECTS:${dep}>)
+  endforeach(dep)
+
+  # TODO: Call the linker explicitly instead of calling the compiler driver to
+  # prevent DT_NEEDED on C++ runtime.
+  add_library(
+    ${target_name}
+    SHARED
+    ${obj_files}
+  )
+  set_target_properties(${target_name} PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+
+  target_link_libraries(
+    ${target_name}
+    -nostdlib -lc -lm
+  )
+
+  set_target_properties(
+    ${target_name}
+    PROPERTIES
+      LINKER_LANGUAGE "C"
+  )
+endfunction(add_redirector_library)
+
 function(add_libc_unittest target_name)
   if(NOT LLVM_INCLUDE_TESTS)
     return()
diff --git a/libc/docs/build_system.rst b/libc/docs/build_system.rst
index f34ffe054b4..84431ccceea 100644
--- a/libc/docs/build_system.rst
+++ b/libc/docs/build_system.rst
@@ -13,6 +13,10 @@ Every entrypoint in LLVM-libc has its own build target. This target is listed
 using the ``add_entrypoint_object`` rule. This rule generates a single object
 file containing the implementation of the entrypoint.
 
+Targets for redirecting entrypoints are also listed using the
+``add_entrypoint_object`` rule. However, one will have to additionally specify
+the ``REDIRECTED`` option with the rule.
+
 Targets for entrypoint libraries
 --------------------------------
 
@@ -22,3 +26,18 @@ the ``lib`` directory as ``add_entrypoint_library`` targets. An
 ``add_entrypoint_library`` target  takes a list of ``add_entrypoint_object``
 targets and produces a static library containing the object files corresponding
 to the ``add_entrypoint_targets``.
+
+Targets for redirectors
+-----------------------
+
+Similar to how every entrypoint in LLVM-libc has its own build target, every
+redirector function also has its own build target. This target is listed using
+the ``add_redirector_object`` rule. This rule generates a single object file
+which can be packaged along with other redirector objects into shared library
+of redirectors (see below).
+
+Targets for library of redirectors
+----------------------------------
+
+Targets for shared libraries of redirectors are listed using the
+``add_redirector_library`` rule.
diff --git a/libc/docs/redirectors.rst b/libc/docs/redirectors.rst
new file mode 100644
index 00000000000..6a59835bb49
--- /dev/null
+++ b/libc/docs/redirectors.rst
@@ -0,0 +1,69 @@
+Redirectors
+===========
+
+When implementing a new C standard library (referred to as *libc* henceforth in
+this document) starting from scratch, it is unrealistic to expect that we will
+have the entire library available from day one. In such a scenario, a practical
+approach is to redirect calls to the unimplemented functions to the same
+functions from another fully functional libc implementation. Such a scheme can
+also serve users who would like to mix and match implementations from LLVM libc
+and another libc implementation. On most platforms, this other libc can be the
+system libc itself. In this document, we present a strategy one can employ to
+build redirectors to redirect from LLVM libc to the system libc. For now, the
+scheme presented is limited to ELF platforms.
+
+Highlevel Mechanism
+-------------------
+
+The highlevel scheme is as below:
+
+<img src="./redirectors_schematic.svg">
+
+As shown in the diagram, the mechanism involves a redirector dynamic library
+which goes in between the llvm-libc static library and the system libc dynamic
+library. Essentially, LLVM libc provides implementations for all public
+functions. However, some of the implementations do not actually implement the
+expected functionality. Instead, they just call the corresponding function in
+the redirector library, which in turn calls the same function from the system
+libc.
+
+Implementation of redirecting entrypoints
+-----------------------------------------
+
+Let us take the ``round`` function from ``math.h`` as an example to see what
+it's implementation looks like when it just redirects to the ``round`` function
+from the system libc.
+
+::
+    namespace llvm_libc {
+
+    double __redirected_round(double);
+
+    double LLVM_LIBC_ENTRYPOINT(round)(double x) {
+        return __redirected_round(x);
+    }
+
+    } // namespace llvm_libc
+
+As can be seen, the ``round`` function from LLVM libc does not call the
+``round`` function from the system libc directly. It calls a function
+``__redirected_round`` from the redirector library. The rest of the
+code follows the conventions described in the *implementation standard*
+document.
+
+Implementation of the redirector function
+-----------------------------------------
+
+The function ``__redirected_round`` calls the ``round`` function from the system
+libc. Its implementation is as follows::
+
+    #include <math.h>  // Header file from the system libc
+
+    namespace llvm_libc {
+
+    double __redirected_round(double x) {
+        return ::round(x);  // Call to round from the system libc
+    }
+
+    } // namespace llvm_libc
+
diff --git a/libc/docs/redirectors_schematic.svg b/libc/docs/redirectors_schematic.svg
new file mode 100644
index 00000000000..7e8d5dfb19f
--- /dev/null
+++ b/libc/docs/redirectors_schematic.svg
@@ -0,0 +1 @@
+<svg version="1.1" viewBox="0.0 0.0 751.0 223.0" fill="none" stroke="none" stroke-linecap="square" stroke-miterlimit="10" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"><clipPath id="p.0"><path d="m0 0l751.0 0l0 223.0l-751.0 0l0 -223.0z" clip-rule="nonzero"/></clipPath><g clip-path="url(#p.0)"><path fill="#000000" fill-opacity="0.0" d="m0 0l751.0 0l0 223.0l-751.0 0z" fill-rule="evenodd"/><path fill="#cfe2f3" d="m8.0 2.0003755l109.732285 0l0 220.0l-109.732285 0z" fill-rule="evenodd"/><path stroke="#000000" stroke-width="1.0" stroke-linejoin="round" stroke-linecap="butt" d="m8.0 2.0003755l109.732285 0l0 220.0l-109.732285 0z" fill-rule="evenodd"/><path fill="#000000" d="m16.96875 117.860374l4.40625 -11.453125l1.640625 0l4.6875 11.453125l-1.734375 0l-1.328125 -3.46875l-4.796875 0l-1.25 3.46875l-1.625 0zm3.3125 -4.703125l3.890625 0l-1.203125 -3.171875q-0.546875 -1.453125 -0.8125 -2.375q-0.21875 1.09375 -0.609375 2.1875l-1.265625 3.359375zm8.453125 7.890625l0 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\ No newline at end of file
diff --git a/libc/lib/CMakeLists.txt b/libc/lib/CMakeLists.txt
index 49e2d2f10d7..121cd1fbb77 100644
--- a/libc/lib/CMakeLists.txt
+++ b/libc/lib/CMakeLists.txt
@@ -2,8 +2,21 @@
 add_entrypoint_library(
   llvmlibc
   DEPENDS
-    ### C standard library entrypoints
     # string.h entrypoints
+    ## C standard library entrypoints
     strcpy
     strcat
 )
+
+add_entrypoint_library(
+  llvmlibm
+  DEPENDS
+    # math.h entrypoints
+    round
+)
+
+add_redirector_library(
+  llvmlibc_redirectors
+  DEPENDS
+    round_redirector
+)
diff --git a/libc/src/CMakeLists.txt b/libc/src/CMakeLists.txt
index b661a65d900..00df58860ff 100644
--- a/libc/src/CMakeLists.txt
+++ b/libc/src/CMakeLists.txt
@@ -1,3 +1,4 @@
 add_subdirectory(string)
+add_subdirectory(math)
 
 add_subdirectory(__support)
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
new file mode 100644
index 00000000000..9501785fe1f
--- /dev/null
+++ b/libc/src/math/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(round)
diff --git a/libc/src/math/round/CMakeLists.txt b/libc/src/math/round/CMakeLists.txt
new file mode 100644
index 00000000000..e7ad9d2a73f
--- /dev/null
+++ b/libc/src/math/round/CMakeLists.txt
@@ -0,0 +1,14 @@
+add_entrypoint_object(
+  round
+  REDIRECTED
+  SRCS
+    round.cpp
+  HDRS
+    round.h
+)
+
+add_redirector_object(
+  round_redirector
+  SRC
+    round_redirector.cpp
+)
diff --git a/libc/src/math/round/round.cpp b/libc/src/math/round/round.cpp
new file mode 100644
index 00000000000..7352b98269f
--- /dev/null
+++ b/libc/src/math/round/round.cpp
@@ -0,0 +1,21 @@
+//===---------------------- Implementation of round -----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/math/round/round.h"
+
+#include "src/__support/common.h"
+
+namespace llvm_libc {
+
+double __round_redirector(double x);
+
+double LLVM_LIBC_ENTRYPOINT(round)(double x) {
+  return __round_redirector(x);
+}
+
+} // namespace llvm_libc
diff --git a/libc/src/math/round/round.h b/libc/src/math/round/round.h
new file mode 100644
index 00000000000..c13ecccfeca
--- /dev/null
+++ b/libc/src/math/round/round.h
@@ -0,0 +1,18 @@
+//===------------------ Implementation header for round -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_MATH_ROUND_H
+#define LLVM_LIBC_SRC_MATH_ROUND_H
+
+namespace llvm_libc {
+
+double round(double x);
+
+} // namespace llvm_libc
+
+#endif // LLVM_LIBC_SRC_MATH_ROUND_H
diff --git a/libc/src/math/round/round_redirector.cpp b/libc/src/math/round/round_redirector.cpp
new file mode 100644
index 00000000000..8d37b0895c7
--- /dev/null
+++ b/libc/src/math/round/round_redirector.cpp
@@ -0,0 +1,17 @@
+//===----------------  Implementation of round redirector -----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <math.h>
+
+namespace llvm_libc {
+
+double __round_redirector(double x) {
+  return ::round(x);
+}
+
+} // namespace llvm_libc