Merge pull request #1 from WebAssembly/add-initial-files

Add initial files.

.gitignore

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+sysroot

LICENSE

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+Please see the LICENSE file in each top-level directory for the terms applicable to that directory and its relative sub-directories.
+
+The relevant directories and licenses are:
+
+basics/      - CC0 1.0 Universal (CC0 1.0) Public Domain Dedication

Makefile

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+# These variables are specifically meant to be overridable via
+# the make command-line.
+WASM_CC = clang
+WASM_CFLAGS = -O2
+WASM_TARGET_FLAGS = --target=wasm32
+SYSROOT = sysroot
+
+# These variables describe the locations of various files and
+# directories in the source tree.
+BASICS_DIR = basics
+BASICS_INC = basics/include
+BASICS_LIBC_DIR = $(BASICS_DIR)/libc
+BASICS_LIBC_SOURCES = $(BASICS_LIBC_DIR)/string.c
+
+.PHONY: $(SYSROOT)
+$(SYSROOT):
+	$(RM) -r "$(SYSROOT)"
+	mkdir -p "$(SYSROOT)/usr"
+
+	#
+	# Install the include files.
+	#
+	cp -r  "$(BASICS_INC)" "$(SYSROOT)/usr"
+
+	#
+	# Build the C startup files.
+	#
+	$(RM) *.o
+	"$(WASM_CC)" $(WASM_CFLAGS) $(WASM_TARGET_FLAGS) --sysroot="$(SYSROOT)" -c $(BASICS_LIBC_DIR)/crt*.s
+	mkdir -p "$(SYSROOT)/lib"
+	mv *.o "$(SYSROOT)/lib"
+
+	#
+	# Compile and install the libc-subset source files.
+	#
+	$(RM) *.o
+	"$(WASM_CC)" $(WASM_CFLAGS) $(WASM_TARGET_FLAGS) --sysroot="$(SYSROOT)" -c $(BASICS_LIBC_SOURCES)
+	mkdir -p "$(SYSROOT)/lib"
+	ar crs "$(SYSROOT)/lib/libc.a" *.o
+	$(RM) *.o

README.md

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+# WebAssembly Reference Sysroot
+
+Caution: This is currently quite experimental and not generally usable yet!
+
+## What is this?
+
+This is a "reference sysroot", which is meant to be part of a common C ABI
+that can be shared across C libraries and compilers. While it's intended to
+(eventually) be usable in its own right, we fully expect other
+implementations to be used in practice by many different systems, though
+we do hope that in those cases, this library defines a useful ABI that can
+be followed.
+
+## Usage
+
+Obtain a WebAssembly-supporting C compiler, and then run:
+
+```
+make WASM_CC=/path/to/wasm/supporting/c/compiler
+```
+
+This makes a directory called "sysroot", by default. See the top of the Makefile
+for customization options.
+
+To use the sysroot, use the `--sysroot=` option:
+
+```
+/path/to/wasm/supporting/c/compiler --sysroot=/path/to/the/newly/built/sysroot ...
+```
+
+to run the compiler using the newly built sysroot.
+
+## Why doesn't this contain a full libc implementation?
+
+In the short term, one of the main goals is just to provide a reference
+point for people already maintaining their own libc codebases, to help
+reduce interface incompatibilities between the several different
+environments out there.
+
+In the long term, there may some day be some form of standardized
+syscall/import layer for wasm which would could support a full
+"reference libc", at which point this repository might make sense as
+a place to host such a thing.
+
+In between, if there are specific pieces of libc functionality which
+people would find useful to have here, and which don't depend on any
+syscalls, we could add them, using code from existing third-party
+codebases as appropriate.

basics/LICENSE

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+Creative Commons Legal Code
+
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+
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basics/include/__typedef_clock_t.h

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+/* Define this as a 64-bit signed integer to avoid wraparounds. */
+typedef long long clock_t;

basics/include/__typedef_time_t.h

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+/* Define this as a 64-bit signed integer to avoid the 2038 bug. */
+typedef long long time_t;

basics/include/stdlib.h

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+#ifndef __wasm_sysroot_stdlib_h
+#define __wasm_sysroot_stdlib_h
+
+#define __need_size_t
+#define __need_wchar_t
+#define __need_NULL
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void *malloc(size_t size);
+void free(void *ptr);
+void *calloc(size_t nmemb, size_t size);
+void *realloc(void *ptr, size_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

basics/include/string.h

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+#ifndef __wasm_sysroot_string_h
+#define __wasm_sysroot_string_h
+
+#define __need_size_t
+#define __need_NULL
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void *memcpy(void *dst, const void *src, size_t n);
+void *memmove(void *dst, const void *src, size_t n);
+void *memset(void *dst, int c, size_t n);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

basics/include/sys/types.h

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+#ifndef __wasm_sysroot_sys_types_h
+#define __wasm_sysroot_sys_types_h
+
+#define __need_size_t
+#include <stddef.h>
+
+#include <__typedef_clock_t.h>
+#include <__typedef_time_t.h>
+
+/* Define these as 64-bit signed integers to support files larger than 2 GiB. */
+typedef long long blksize_t;
+typedef long long off_t;
+
+/* This is defined to be the same size as size_t. */
+typedef long ssize_t;
+
+#endif

basics/include/time.h

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+#ifndef __wasm_sysroot_time_h
+#define __wasm_sysroot_time_h
+
+#define __need_size_t
+#define __need_NULL
+#include <stddef.h>
+
+#include <__typedef_time_t.h>
+
+#endif

basics/include/wchar.h

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+#ifndef __wasm_sysroot_wchar_h
+#define __wasm_sysroot_wchar_h
+
+#define __need_size_t
+#define __need_wchar_t
+#define __need_NULL
+#include <stddef.h>
+
+#endif

basics/libc/crt1.s

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+# Empty.

basics/libc/string.c

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+#include <string.h>
+#include <stdint.h>
+
+static void *copy_forward(void *restrict dst, const void *restrict src, size_t n) {
+    char *d = (char *)dst;
+    const char *s = (const char *)src;
+    while (n-- != 0) {
+        *d++ = *s++;
+    }
+    return dst;
+}
+
+static void *copy_backward(void *restrict dst, const void *restrict src, size_t n) {
+    char *d = (char *)dst;
+    const char *s = (const char *)src;
+    d += n;
+    s += n;
+    while (n-- != 0) {
+        *--d = *--s;
+    }
+    return dst;
+}
+
+void *memcpy(void *restrict dst, const void *restrict src, size_t n) {
+    return copy_forward(dst, src, n);
+}
+
+void *memmove(void *dst, const void *src, size_t n) {
+    if ((uintptr_t)dst - (uintptr_t)src >= n) {
+        return copy_forward(dst, src, n);
+    }
+    return copy_backward(dst, src, n);
+}
+
+void *memset(void *restrict dst, int c, size_t n) {
+    char *d = (char *)dst;
+    while (n-- != 0) {
+        *d++ = c;
+    }
+    return dst;
+}