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

[sivachandra]

Summary

Setup demonstrated 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.

[sivachandra]

This patch illustrates one the desired "features" as proposed in http://llvm.org/docs/Proposals/LLVMLibC.html

[MaskRay]

libc/cmake/modules/LLVMLibCRules.cmake

270

You may need something like -nostdlib

281

-lc is implicit unless -nolibc (clang-only).

-nolibc is implied by -nodefaultlibs. -nodefaultlibs is implied by -nostdlib.

libc/src/math/round/round.h

15

Delete x

[jakehehrlich]

I've missed some emails and the round table at llvm. Could you describe more about why this mechanism for redirecting is used? It seems to me that there should be a way for LLVM_LIBC_ENTRYPOINT(round) to be an alias for ::round rather than requiring two (likely tail) calls here. Could you motivate this mechanism?

libc/docs/redirectors.rst

34

"...to see how it's..." should be "...to see what it's..."

[sivachandra]

In D69020#1721904, @jakehehrlich wrote:

I've missed some emails and the round table at llvm. Could you describe more about why this mechanism for redirecting is used? It seems to me that there should be a way for LLVM_LIBC_ENTRYPOINT(round) to be an alias for ::round rather than requiring two (likely tail) calls here. Could you motivate this mechanism?

Yes. Agreed that there is an added 2-call overhead, so I do not see this being used for all functions. Further, this is only an optional feature and not a necessary feature in the sense that one can choose to not include it in their libc build if they do not want to.

About what is it used for: we want to use LLVM-libc as a drop in replacement for the system libc as early as possible. So, having this redirector mechanism is one way to do it. One can argue that if static linking is all we care about, then such a mechanism is not required. However, having wrappers for system libc functions (when LLVM-libc does not provide the implementation) gives us a place to apply compiler based and other security mitigations.

[I now realize that the diagram is not viewable on phabricator, so I have put it on my github account: https://github.com/sivachandra/llvm-libc/blob/master/docs/redirectors.md ]

[jakehehrlich]

I guess my question is more, whats the evidence that there isn't a way to avoid the two call overhead? The use case makes sense to me but my impression is that __round_redirector could be declared to have extern "C" linkage and then llvm_libc::round can be an alias for it. That gets rid of 1 layer of indirection. Getting rid of the next call seems more gross to me but I think some additional objcopy magic can be done to make __round_redirector an alias for ::round then I think this would all link correctly, right?

We can do this for now perhaps and then we can add a feature to llvm-objcopy called --add-symbol-alias that would allow adding symbol aliases like this.

If we can't make __round_redirector live outside of llvm_libc and have extern "C" linkage then I suppose there's no good way but we should explain that we have that requirement

[sivachandra]

In D69020#1723979, @jakehehrlich wrote:

I guess my question is more, whats the evidence that there isn't a way to avoid the two call overhead? The use case makes sense to me but my impression is that __round_redirector could be declared to have extern "C" linkage and then llvm_libc::round can be an alias for it. That gets rid of 1 layer of indirection. Getting rid of the next call seems more gross to me but I think some additional objcopy magic can be done to make __round_redirector an alias for ::round then I think this would all link correctly, right?

I have probably not listed out some of the constraints clearly. One of them is this: Even with LLVM-libc redirectors used, we want link to the system libc dynamically. This is because: 1. On most platforms, one links to the system libc dynamically, 2. If the system-libc were glibc, then we cannot unconditionally link to it statically anyway. Hence, I am not sure if we can eliminate the second call at all.

About the scheme you suggest to eliminate the first additional call:

Let me simplify it further. When redirectors are involved, we do not really need a llvm_libc::round. We can just have extern "C" __round_redirector and add an alias to it using llvm-objcopy or put it in source. Look at this example: https://github.com/sivachandra/redirectors

The problem with this scheme is that, since the alias round and the aliasee __round_redirector both live in the same object file, linkers will end up wiring a recursive call even if round is a hidden symbol.

Did I misunderstand your suggestion?

We can do this for now perhaps and then we can add a feature to llvm-objcopy called --add-symbol-alias that would allow adding symbol aliases like this.

If we can come up with schemes which require help from tools like llvm-objcopy (even if they have to be extended), I think that would be acceptable. In this case though, unless I have totally misunderstood your proposal, it does not seem like we can pull off without some form special treatment from the linker.

[jakehehrlich]

Personally this looks good to me!

[jakehehrlich]

Please wait on another reviewer to give the ok and respond to remaining comments however.

[sivachandra]

Address comments

[sivachandra]

libc/cmake/modules/LLVMLibCRules.cmake

281

I tried all the combinations I could think of (and also explicitly setting the linker language below.) But, CMake's link step is still adding -lstdc++ to the driver command line. So, I am leaving it now as you suggest here. Will fix this up in later, more focused, round.

libc/cmake/modules/LLVMLibCRules.cmake

 endfunction(add_gen_header)
 
 set(ENTRYPOINT_OBJ_TARGET_TYPE "ENTRYPOINT_OBJ")
 
 # A rule for entrypoint object targets.
 # 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>
 #     )
 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}
   )
   if(NOT ADD_ENTRYPOINT_OBJ_SRCS)
     message(FATAL_ERROR "`add_entrypoint_object` rule requires SRCS to be specified.")
   endif()
   if(NOT ADD_ENTRYPOINT_OBJ_HDRS)
     message(FATAL_ERROR "`add_entrypoint_object` rule requires HDRS to be specified.")
   endif()
 
   add_library(
     "${target_name}_objects"
     # We want an object library as the objects will eventually get packaged into
     # an archive (like libc.a).
     OBJECT
     ${ADD_ENTRYPOINT_OBJ_SRCS}
     ${ADD_ENTRYPOINT_OBJ_HDRS}
   )
   target_compile_options(
     ${target_name}_objects
     BEFORE
     PRIVATE
-      -fpie -std=${LLVM_CXX_STD_default}
+      -fpie ${LLVM_CXX_STD_default}
   )
   target_include_directories(
     ${target_name}_objects
     PRIVATE
       "${LIBC_BUILD_DIR}/include;${LIBC_SOURCE_DIR};${LIBC_BUILD_DIR}"
   )
   add_dependencies(
     ${target_name}_objects
function(add_entrypoint_object target_name)
   set(object_file "${CMAKE_CURRENT_BINARY_DIR}/${target_name}.o")
 
   add_custom_command(
     OUTPUT ${object_file_raw}
     DEPENDS $<TARGET_OBJECTS:${target_name}_objects>
     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(
     ${target_name}
     ALL
     DEPENDS ${object_file}
   )
   set_target_properties(
function(add_entrypoint_library target_name)
   )
   add_custom_target(
     ${target_name}
     ALL
     DEPENDS ${library_file}
   )
 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()
   endif()
 
   cmake_parse_arguments(
     "LIBC_UNITTEST"
     "" # No optional arguments

libc/docs/build_system.rst

 LLVM libc build rules
 =====================
 
 At the cost of verbosity, we want to keep the build system of LLVM libc
 as simple as possible. We also want to be highly modular with our build
 targets. This makes picking and choosing desired pieces a straighforward
 task.
 
 Targets for entrypoints
 -----------------------
 
 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
 --------------------------------
 
 Standards like POSIX require that a libc provide certain library files like
 ``libc.a``, ``libm.a``, etc. The targets for such library files are listed in
 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.

libc/docs/redirectors.rst

+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
+

libc/docs/redirectors_schematic.svg

+<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

libc/lib/CMakeLists.txt

 
 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
+)

libc/src/CMakeLists.txt

 add_subdirectory(string)
+add_subdirectory(math)
 
 add_subdirectory(__support)

libc/src/math/CMakeLists.txt

+add_subdirectory(round)

libc/src/math/round/CMakeLists.txt

+add_entrypoint_object(
+  round
+  REDIRECTED
+  SRCS
+    round.cpp
+  HDRS
+    round.h
+)
+
+add_redirector_object(
+  round_redirector
+  SRC
+    round_redirector.cpp
+)

libc/src/math/round/round.h

+//===------------------ 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

libc/src/math/round/round.cpp

+//===---------------------- 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

libc/src/math/round/round_redirector.cpp

+//===----------------  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