Mercurial > projects > ldc
view lphobos/gc/gclinux.d @ 1047:6bb04dbee21f
Some calling convention work for x86-64:
- Implement x86-64 extern(C), hopefully correctly.
- Tried to be a bit smarter about extern(D) while I was there.
Interestingly, this code seems to be generating more efficient code than
gcc and llvm-gcc in some edge cases, like returning a `{ [7 x i8] }` loaded from
a stack slot from an extern(C) function. (gcc generates 7 1-byte loads, while
this code generates a 4-byte, a 2-byte and a 1-byte load)
I also added some changes to make sure structs being returned from functions or
passed in as parameters are stored in memory where the rest of the backend seems
to expect them to be. These should be removed when support for first-class
aggregates improves.
author | Frits van Bommel <fvbommel wxs.nl> |
---|---|
date | Fri, 06 Mar 2009 16:00:47 +0100 |
parents | 61615fa85940 |
children |
line wrap: on
line source
// Copyright (C) 2001-2004 by Digital Mars, www.digitalmars.com // All Rights Reserved // Written by Walter Bright import std.c.linux.linuxextern; import std.c.linux.linux; /+ extern (C) { // from <sys/mman.h> void* mmap(void* addr, uint len, int prot, int flags, int fd, uint offset); int munmap(void* addr, uint len); const void* MAP_FAILED = cast(void*)-1; // from <bits/mman.h> enum { PROT_NONE = 0, PROT_READ = 1, PROT_WRITE = 2, PROT_EXEC = 4 } enum { MAP_SHARED = 1, MAP_PRIVATE = 2, MAP_TYPE = 0x0F, MAP_FIXED = 0x10, MAP_FILE = 0, MAP_ANON = 0x20 } } +/ /*********************************** * Map memory. */ void *os_mem_map(uint nbytes) { void *p; //errno = 0; p = mmap(null, nbytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); return (p == MAP_FAILED) ? null : p; } /*********************************** * Commit memory. * Returns: * 0 success * !=0 failure */ int os_mem_commit(void *base, uint offset, uint nbytes) { return 0; } /*********************************** * Decommit memory. * Returns: * 0 success * !=0 failure */ int os_mem_decommit(void *base, uint offset, uint nbytes) { return 0; } /*********************************** * Unmap memory allocated with os_mem_map(). * Returns: * 0 success * !=0 failure */ int os_mem_unmap(void *base, uint nbytes) { return munmap(base, nbytes); } /********************************************** * Determine "bottom" of stack (actually the top on x86 systems). */ void *os_query_stackBottom() { version (none) { // See discussion: http://autopackage.org/forums/viewtopic.php?t=22 static void** libc_stack_end; if (libc_stack_end == libc_stack_end.init) { void* handle = dlopen(null, RTLD_NOW); libc_stack_end = cast(void **)dlsym(handle, "__libc_stack_end"); dlclose(handle); } return *libc_stack_end; } else { // This doesn't resolve on all versions of Linux return __libc_stack_end; } } /********************************************** * Determine base address and size of static data segment. */ void os_query_staticdataseg(void **base, uint *nbytes) { *base = cast(void *)&__data_start; *nbytes = cast(byte *)&_end - cast(byte *)&__data_start; }