[libc-commits] [libc] POC: add snmalloc as an alternative allocator to libc (PR #122284)
Schrodinger ZHU Yifan via libc-commits
libc-commits at lists.llvm.org
Wed Jan 15 19:41:28 PST 2025
https://github.com/SchrodingerZhu updated https://github.com/llvm/llvm-project/pull/122284
>From ddedf1e4b10a9b386fd334c3babcfd604bed6c62 Mon Sep 17 00:00:00 2001
From: Schrodinger ZHU Yifan <i at zhuyi.fan>
Date: Thu, 9 Jan 2025 22:57:57 +0800
Subject: [PATCH] POC: add snmalloc as an alternative allocator to libc
---
libc/src/stdlib/CMakeLists.txt | 41 +++++++++++-
libc/src/stdlib/snmalloc/CMakeLists.txt | 75 ++++++++++++++++++++++
libc/src/stdlib/snmalloc/aligned_alloc.cpp | 0
libc/src/stdlib/snmalloc/calloc.cpp | 0
libc/src/stdlib/snmalloc/free.cpp | 0
libc/src/stdlib/snmalloc/malloc.cpp | 9 +++
libc/src/stdlib/snmalloc/mallopt.cpp | 0
libc/src/stdlib/snmalloc/realloc.cpp | 0
libc/src/stdlib/snmalloc/support.h | 14 ++++
9 files changed, 138 insertions(+), 1 deletion(-)
create mode 100644 libc/src/stdlib/snmalloc/CMakeLists.txt
create mode 100644 libc/src/stdlib/snmalloc/aligned_alloc.cpp
create mode 100644 libc/src/stdlib/snmalloc/calloc.cpp
create mode 100644 libc/src/stdlib/snmalloc/free.cpp
create mode 100644 libc/src/stdlib/snmalloc/malloc.cpp
create mode 100644 libc/src/stdlib/snmalloc/mallopt.cpp
create mode 100644 libc/src/stdlib/snmalloc/realloc.cpp
create mode 100644 libc/src/stdlib/snmalloc/support.h
diff --git a/libc/src/stdlib/CMakeLists.txt b/libc/src/stdlib/CMakeLists.txt
index 40ba9ead9a7ae6..7d0dfd1aa9da4b 100644
--- a/libc/src/stdlib/CMakeLists.txt
+++ b/libc/src/stdlib/CMakeLists.txt
@@ -324,7 +324,46 @@ add_entrypoint_object(
)
if(NOT LIBC_TARGET_OS_IS_BAREMETAL AND NOT LIBC_TARGET_OS_IS_GPU)
- if(LLVM_LIBC_INCLUDE_SCUDO)
+ if (NOT "${LLVM_LIBC_INCLUDE_SNMALLOC}" STREQUAL "")
+ message(STATUS "Including snmalloc as the allocator, source directory: ${LLVM_LIBC_INCLUDE_SNMALLOC}")
+ add_subdirectory(snmalloc)
+ add_entrypoint_object(
+ malloc
+ ALIAS
+ DEPENDS
+ .snmalloc.malloc
+ )
+ add_entrypoint_object(
+ calloc
+ ALIAS
+ DEPENDS
+ .snmalloc.calloc
+ )
+ add_entrypoint_object(
+ realloc
+ ALIAS
+ DEPENDS
+ .snmalloc.realloc
+ )
+ add_entrypoint_object(
+ aligned_alloc
+ ALIAS
+ DEPENDS
+ .snmalloc.aligned_alloc
+ )
+ add_entrypoint_object(
+ free
+ ALIAS
+ DEPENDS
+ .snmalloc.free
+ )
+ add_entrypoint_object(
+ mallopt
+ ALIAS
+ DEPENDS
+ .snmalloc.mallopt
+ )
+ elseif(LLVM_LIBC_INCLUDE_SCUDO)
set(SCUDO_DEPS "")
include(${LIBC_SOURCE_DIR}/../compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake)
diff --git a/libc/src/stdlib/snmalloc/CMakeLists.txt b/libc/src/stdlib/snmalloc/CMakeLists.txt
new file mode 100644
index 00000000000000..3971ea42db1744
--- /dev/null
+++ b/libc/src/stdlib/snmalloc/CMakeLists.txt
@@ -0,0 +1,75 @@
+set(SNMALLOC_USE_SELF_VENDORED_STL ON CACHE BOOL "use freestanding snmalloc setup" FORCE)
+set(SNMALLOC_BUILD_TESTING OFF CACHE BOOL "disable snmalloc tests" FORCE)
+set(SNMALLOC_HEADER_ONLY_LIBRARY ON CACHE BOOL "use snmalloc as header only library" FORCE)
+
+# Disable installation
+macro (install)
+endmacro ()
+
+add_subdirectory(${LLVM_LIBC_INCLUDE_SNMALLOC} ${CMAKE_CURRENT_BINARY_DIR}/snmalloc EXCLUDE_FROM_ALL)
+
+target_compile_options(
+ snmalloc
+ INTERFACE
+ -ffreestanding
+ -nostdinc
+ -Wno-newline-eof
+ -Wno-extra-semi
+ -Wno-unused-command-line-argument
+ -Wno-ctad-maybe-unsupported
+ # TODO: define this
+ -DSTDERR_FILENO=2
+ -include ${CMAKE_CURRENT_SOURCE_DIR}/support.h
+ # include_directories does not propagate, use options instead
+ -isystem ${COMPILER_RESOURCE_DIR}/include
+ -isystem ${LIBC_INCLUDE_DIR}
+)
+add_dependencies(snmalloc libc-headers)
+
+add_entrypoint_object(
+ malloc
+ SRCS
+ malloc.cpp
+ DEPENDS
+ snmalloc
+)
+
+add_entrypoint_object(
+ calloc
+ SRCS
+ calloc.cpp
+ DEPENDS
+ snmalloc
+)
+
+add_entrypoint_object(
+ realloc
+ SRCS
+ realloc.cpp
+ DEPENDS
+ snmalloc
+)
+
+add_entrypoint_object(
+ aligned_alloc
+ SRCS
+ aligned_alloc.cpp
+ DEPENDS
+ snmalloc
+)
+
+add_entrypoint_object(
+ free
+ SRCS
+ free.cpp
+ DEPENDS
+ snmalloc
+)
+
+add_entrypoint_object(
+ mallopt
+ SRCS
+ mallopt.cpp
+ DEPENDS
+ snmalloc
+)
diff --git a/libc/src/stdlib/snmalloc/aligned_alloc.cpp b/libc/src/stdlib/snmalloc/aligned_alloc.cpp
new file mode 100644
index 00000000000000..e69de29bb2d1d6
diff --git a/libc/src/stdlib/snmalloc/calloc.cpp b/libc/src/stdlib/snmalloc/calloc.cpp
new file mode 100644
index 00000000000000..e69de29bb2d1d6
diff --git a/libc/src/stdlib/snmalloc/free.cpp b/libc/src/stdlib/snmalloc/free.cpp
new file mode 100644
index 00000000000000..e69de29bb2d1d6
diff --git a/libc/src/stdlib/snmalloc/malloc.cpp b/libc/src/stdlib/snmalloc/malloc.cpp
new file mode 100644
index 00000000000000..644f2eef0ed2bf
--- /dev/null
+++ b/libc/src/stdlib/snmalloc/malloc.cpp
@@ -0,0 +1,9 @@
+#include "src/stdlib/malloc.h"
+#include "snmalloc/snmalloc.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE_DECL {
+LLVM_LIBC_FUNCTION(void *, malloc, (size_t size)) {
+ return snmalloc::libc::malloc(size);
+}
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/stdlib/snmalloc/mallopt.cpp b/libc/src/stdlib/snmalloc/mallopt.cpp
new file mode 100644
index 00000000000000..e69de29bb2d1d6
diff --git a/libc/src/stdlib/snmalloc/realloc.cpp b/libc/src/stdlib/snmalloc/realloc.cpp
new file mode 100644
index 00000000000000..e69de29bb2d1d6
diff --git a/libc/src/stdlib/snmalloc/support.h b/libc/src/stdlib/snmalloc/support.h
new file mode 100644
index 00000000000000..4909667c1a50d8
--- /dev/null
+++ b/libc/src/stdlib/snmalloc/support.h
@@ -0,0 +1,14 @@
+#include "src/sys/random/getrandom.h"
+
+// TODO: define this
+inline int getentropy(void *buf, size_t size) {
+ while (size > 0) {
+ ssize_t ret = LIBC_NAMESPACE::getrandom(buf, size, 0);
+ if (ret < 0) {
+ return -1;
+ }
+ buf = (char *)buf + ret;
+ size -= ret;
+ }
+ return 0;
+}
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