mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-07-26 06:38:42 +00:00
Ayke van Laethem
256e84f912
By disabling some configuration options (and updating the library), the library becomes a lot smaller. With `-no-debug`, binaries become ~18kB smaller on Linux, ~4kB smaller on MacOS, ~9kB smaller on Windows, and ~12kB smaller on WebAssembly.
92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
package builder
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// The well-known conservative Boehm-Demers-Weiser GC.
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// This file provides a way to compile this GC for use with TinyGo.
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import (
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"path/filepath"
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"strings"
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"github.com/tinygo-org/tinygo/goenv"
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)
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var BoehmGC = Library{
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name: "bdwgc",
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cflags: func(target, headerPath string) []string {
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libdir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/bdwgc")
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flags := []string{
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// use a modern environment
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"-DUSE_MMAP", // mmap is available
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"-DUSE_MUNMAP", // return memory to the OS using munmap
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"-DGC_BUILTIN_ATOMIC", // use compiler intrinsics for atomic operations
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"-DNO_EXECUTE_PERMISSION", // don't make the heap executable
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// specific flags for TinyGo
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"-DALL_INTERIOR_POINTERS", // scan interior pointers (needed for Go)
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"-DIGNORE_DYNAMIC_LOADING", // we don't support dynamic loading at the moment
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"-DNO_GETCONTEXT", // musl doesn't support getcontext()
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"-DGC_DISABLE_INCREMENTAL", // don't mess with SIGSEGV and such
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// Use a minimal environment.
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"-DNO_MSGBOX_ON_ERROR", // don't call MessageBoxA on Windows
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"-DDONT_USE_ATEXIT",
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"-DNO_GETENV", // smaller binary, more predictable configuration
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"-DNO_CLOCK", // don't use system clock
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"-DNO_DEBUGGING", // reduce code size
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"-DGC_NO_FINALIZATION", // finalization is not used at the moment
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// Special flag to work around the lack of __data_start in ld.lld.
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// TODO: try to fix this in LLVM/lld directly so we don't have to
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// work around it anymore.
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"-DGC_DONT_REGISTER_MAIN_STATIC_DATA",
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// Do not scan the stack. We have our own mechanism to do this.
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"-DSTACK_NOT_SCANNED",
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"-DNO_PROC_STAT", // we scan the stack manually (don't read /proc/self/stat on Linux)
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"-DSTACKBOTTOM=0", // dummy value, we scan the stack manually
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// Assertions can be enabled while debugging GC issues.
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//"-DGC_ASSERTIONS",
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// We use our own way of dealing with threads (that is a bit hacky).
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// See src/runtime/gc_boehm.go.
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//"-DGC_THREADS",
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//"-DTHREAD_LOCAL_ALLOC",
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"-I" + libdir + "/include",
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}
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return flags
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},
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needsLibc: true,
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sourceDir: func() string {
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return filepath.Join(goenv.Get("TINYGOROOT"), "lib/bdwgc")
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},
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librarySources: func(target string, _ bool) ([]string, error) {
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sources := []string{
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"allchblk.c",
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"alloc.c",
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"blacklst.c",
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"dbg_mlc.c",
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"dyn_load.c",
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"headers.c",
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"mach_dep.c",
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"malloc.c",
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"mark.c",
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"mark_rts.c",
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"misc.c",
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"new_hblk.c",
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"os_dep.c",
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"reclaim.c",
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}
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if strings.Split(target, "-")[2] == "windows" {
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// Due to how the linker on Windows works (that doesn't allow
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// undefined functions), we need to include these extra files.
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sources = append(sources,
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"mallocx.c",
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"ptr_chck.c",
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)
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}
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return sources, nil
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},
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}
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