void runtime·mallocinit ( void ) { byte *p; uintptr arena_size , bitmap_size; extern byte end[]; byte *want; uintptr limit; #line 2311 "C:\Go\src\pkg\runtime\malloc.goc" p = nil; arena_size = 0; bitmap_size = 0; #line 2316 "C:\Go\src\pkg\runtime\malloc.goc" USED ( p ) ; USED ( arena_size ) ; USED ( bitmap_size ) ; #line 2320 "C:\Go\src\pkg\runtime\malloc.goc" runtime·InitSizes ( ) ; #line 2322 "C:\Go\src\pkg\runtime\malloc.goc" limit = runtime·memlimit ( ) ; #line 2327 "C:\Go\src\pkg\runtime\malloc.goc" if ( sizeof ( void* ) == 8 && ( limit == 0 || limit > ( 1<<30 ) ) ) { #line 2352 "C:\Go\src\pkg\runtime\malloc.goc" arena_size = 16LL<<30; bitmap_size = arena_size / ( sizeof ( void* ) *8/4 ) ; p = runtime·SysReserve ( ( void* ) ( 0x00f8ULL<<32 ) , bitmap_size + arena_size ) ; } if ( p == nil ) { #line 2374 "C:\Go\src\pkg\runtime\malloc.goc" bitmap_size = MaxArena32 / ( sizeof ( void* ) *8/4 ) ; arena_size = 512<<20; if ( limit > 0 && arena_size+bitmap_size > limit ) { bitmap_size = ( limit / 9 ) & ~ ( ( 1<<PageShift ) - 1 ) ; arena_size = bitmap_size * 8; } #line 2390 "C:\Go\src\pkg\runtime\malloc.goc" want = ( byte* ) ( ( ( uintptr ) end + ( 1<<18 ) + ( 1<<20 ) - 1 ) &~ ( ( 1<<20 ) -1 ) ) ; p = runtime·SysReserve ( want , bitmap_size + arena_size ) ; if ( p == nil ) runtime·throw ( "runtime: cannot reserve arena virtual address space" ) ; if ( ( uintptr ) p & ( ( ( uintptr ) 1<<PageShift ) -1 ) ) runtime·printf ( "runtime: SysReserve returned unaligned address %p; asked for %p" , p , bitmap_size+arena_size ) ; } if ( ( uintptr ) p & ( ( ( uintptr ) 1<<PageShift ) -1 ) ) runtime·throw ( "runtime: SysReserve returned unaligned address" ) ; #line 2400 "C:\Go\src\pkg\runtime\malloc.goc" runtime·mheap.bitmap = p; runtime·mheap.arena_start = p + bitmap_size; runtime·mheap.arena_used = runtime·mheap.arena_start; runtime·mheap.arena_end = runtime·mheap.arena_start + arena_size; #line 2406 "C:\Go\src\pkg\runtime\malloc.goc" runtime·MHeap_Init ( &runtime·mheap , runtime·SysAlloc ) ; m->mcache = runtime·allocmcache ( ) ; #line 2410 "C:\Go\src\pkg\runtime\malloc.goc" runtime·free ( runtime·malloc ( 1 ) ) ; }
void runtime·startpanic(void) { if(runtime·mheap == 0 || runtime·mheap->cachealloc.size == 0) { // very early runtime·printf("runtime: panic before malloc heap initialized\n"); m->mallocing = 1; // tell rest of panic not to try to malloc } else if(m->mcache == nil) // can happen if called from signal handler or throw m->mcache = runtime·allocmcache(); if(m->dying) { runtime·printf("panic during panic\n"); runtime·exit(3); } m->dying = 1; runtime·xadd(&runtime·panicking, 1); runtime·lock(&paniclk); }
// Called to start an M. void runtime·mstart(void) { if(g != m->g0) runtime·throw("bad runtime·mstart"); if(m->mcache == nil) m->mcache = runtime·allocmcache(); // Record top of stack for use by mcall. // Once we call schedule we're never coming back, // so other calls can reuse this stack space. runtime·gosave(&m->g0->sched); m->g0->sched.pc = (void*)-1; // make sure it is never used runtime·minit(); schedule(nil); }
static void mcommoninit(M *mp) { mp->id = runtime·sched.mcount++; mp->fastrand = 0x49f6428aUL + mp->id + runtime·cputicks(); if(mp->mcache == nil) mp->mcache = runtime·allocmcache(); runtime·callers(1, mp->createstack, nelem(mp->createstack)); // Add to runtime·allm so garbage collector doesn't free m // when it is just in a register or thread-local storage. mp->alllink = runtime·allm; // runtime·NumCgoCall() iterates over allm w/o schedlock, // so we need to publish it safely. runtime·atomicstorep(&runtime·allm, mp); }
static void mcommoninit(M *m) { m->id = runtime·sched.mcount++; m->fastrand = 0x49f6428aUL + m->id + runtime·cputicks(); m->stackalloc = runtime·malloc(sizeof(*m->stackalloc)); runtime·FixAlloc_Init(m->stackalloc, FixedStack, runtime·SysAlloc, nil, nil); if(m->mcache == nil) m->mcache = runtime·allocmcache(); runtime·callers(1, m->createstack, nelem(m->createstack)); // Add to runtime·allm so garbage collector doesn't free m // when it is just in a register or thread-local storage. m->alllink = runtime·allm; // runtime·NumCgoCall() iterates over allm w/o schedlock, // so we need to publish it safely. runtime·atomicstorep(&runtime·allm, m); }
void runtime·mallocinit ( void ) { byte *p; uintptr arena_size , bitmap_size; extern byte end[]; byte *want; #line 264 "malloc.goc" runtime·InitSizes ( ) ; #line 269 "malloc.goc" if ( sizeof ( void* ) == 8 ) { #line 292 "malloc.goc" arena_size = 16LL<<30; bitmap_size = arena_size / ( sizeof ( void* ) *8/4 ) ; p = runtime·SysReserve ( ( void* ) ( 0x00f8ULL<<32 ) , bitmap_size + arena_size ) ; if ( p == nil ) runtime·throw ( "runtime: cannot reserve arena virtual address space" ) ; } else { #line 315 "malloc.goc" bitmap_size = MaxArena32 / ( sizeof ( void* ) *8/4 ) ; arena_size = 512<<20; #line 327 "malloc.goc" want = ( byte* ) ( ( ( uintptr ) end + ( 1<<18 ) + ( 1<<20 ) - 1 ) &~ ( ( 1<<20 ) -1 ) ) ; p = runtime·SysReserve ( want , bitmap_size + arena_size ) ; if ( p == nil ) runtime·throw ( "runtime: cannot reserve arena virtual address space" ) ; } if ( ( uintptr ) p & ( ( ( uintptr ) 1<<PageShift ) -1 ) ) runtime·throw ( "runtime: SysReserve returned unaligned address" ) ; #line 335 "malloc.goc" runtime·mheap.bitmap = p; runtime·mheap.arena_start = p + bitmap_size; runtime·mheap.arena_used = runtime·mheap.arena_start; runtime·mheap.arena_end = runtime·mheap.arena_start + arena_size; #line 341 "malloc.goc" runtime·MHeap_Init ( &runtime·mheap , runtime·SysAlloc ) ; m->mcache = runtime·allocmcache ( ) ; #line 345 "malloc.goc" runtime·free ( runtime·malloc ( 1 ) ) ; }
void runtime·startpanic(void) { if(runtime·mheap.cachealloc.size == 0) { // very early runtime·printf("runtime: panic before malloc heap initialized\n"); m->mallocing = 1; // tell rest of panic not to try to malloc } else if(m->mcache == nil) // can happen if called from signal handler or throw m->mcache = runtime·allocmcache(); switch(m->dying) { case 0: m->dying = 1; if(g != nil) g->writebuf = nil; runtime·xadd(&runtime·panicking, 1); runtime·lock(&paniclk); if(runtime·debug.schedtrace > 0 || runtime·debug.scheddetail > 0) runtime·schedtrace(true); runtime·freezetheworld(); return; case 1: // Something failed while panicing, probably the print of the // argument to panic(). Just print a stack trace and exit. m->dying = 2; runtime·printf("panic during panic\n"); runtime·dopanic(0); runtime·exit(3); case 2: // This is a genuine bug in the runtime, we couldn't even // print the stack trace successfully. m->dying = 3; runtime·printf("stack trace unavailable\n"); runtime·exit(4); default: // Can't even print! Just exit. runtime·exit(5); } }
void runtime·mallocinit(void) { byte *p, *p1; uintptr arena_size, bitmap_size, spans_size, p_size; extern byte runtime·end[]; uintptr limit; uint64 i; bool reserved; p = nil; p_size = 0; arena_size = 0; bitmap_size = 0; spans_size = 0; reserved = false; // for 64-bit build USED(p); USED(p_size); USED(arena_size); USED(bitmap_size); USED(spans_size); runtime·InitSizes(); if(runtime·class_to_size[TinySizeClass] != TinySize) runtime·throw("bad TinySizeClass"); // limit = runtime·memlimit(); // See https://code.google.com/p/go/issues/detail?id=5049 // TODO(rsc): Fix after 1.1. limit = 0; // Set up the allocation arena, a contiguous area of memory where // allocated data will be found. The arena begins with a bitmap large // enough to hold 4 bits per allocated word. if(sizeof(void*) == 8 && (limit == 0 || limit > (1<<30))) { // On a 64-bit machine, allocate from a single contiguous reservation. // 128 GB (MaxMem) should be big enough for now. // // The code will work with the reservation at any address, but ask // SysReserve to use 0x0000XXc000000000 if possible (XX=00...7f). // Allocating a 128 GB region takes away 37 bits, and the amd64 // doesn't let us choose the top 17 bits, so that leaves the 11 bits // in the middle of 0x00c0 for us to choose. Choosing 0x00c0 means // that the valid memory addresses will begin 0x00c0, 0x00c1, ..., 0x00df. // In little-endian, that's c0 00, c1 00, ..., df 00. None of those are valid // UTF-8 sequences, and they are otherwise as far away from // ff (likely a common byte) as possible. If that fails, we try other 0xXXc0 // addresses. An earlier attempt to use 0x11f8 caused out of memory errors // on OS X during thread allocations. 0x00c0 causes conflicts with // AddressSanitizer which reserves all memory up to 0x0100. // These choices are both for debuggability and to reduce the // odds of the conservative garbage collector not collecting memory // because some non-pointer block of memory had a bit pattern // that matched a memory address. // // Actually we reserve 136 GB (because the bitmap ends up being 8 GB) // but it hardly matters: e0 00 is not valid UTF-8 either. // // If this fails we fall back to the 32 bit memory mechanism arena_size = MaxMem; bitmap_size = arena_size / (sizeof(void*)*8/4); spans_size = arena_size / PageSize * sizeof(runtime·mheap.spans[0]); spans_size = ROUND(spans_size, PageSize); for(i = 0; i <= 0x7f; i++) { p = (void*)(i<<40 | 0x00c0ULL<<32); p_size = bitmap_size + spans_size + arena_size + PageSize; p = runtime·SysReserve(p, p_size, &reserved); if(p != nil) break; } } if (p == nil) { // On a 32-bit machine, we can't typically get away // with a giant virtual address space reservation. // Instead we map the memory information bitmap // immediately after the data segment, large enough // to handle another 2GB of mappings (256 MB), // along with a reservation for another 512 MB of memory. // When that gets used up, we'll start asking the kernel // for any memory anywhere and hope it's in the 2GB // following the bitmap (presumably the executable begins // near the bottom of memory, so we'll have to use up // most of memory before the kernel resorts to giving out // memory before the beginning of the text segment). // // Alternatively we could reserve 512 MB bitmap, enough // for 4GB of mappings, and then accept any memory the // kernel threw at us, but normally that's a waste of 512 MB // of address space, which is probably too much in a 32-bit world. bitmap_size = MaxArena32 / (sizeof(void*)*8/4); arena_size = 512<<20; spans_size = MaxArena32 / PageSize * sizeof(runtime·mheap.spans[0]); if(limit > 0 && arena_size+bitmap_size+spans_size > limit) { bitmap_size = (limit / 9) & ~((1<<PageShift) - 1); arena_size = bitmap_size * 8; spans_size = arena_size / PageSize * sizeof(runtime·mheap.spans[0]); } spans_size = ROUND(spans_size, PageSize); // SysReserve treats the address we ask for, end, as a hint, // not as an absolute requirement. If we ask for the end // of the data segment but the operating system requires // a little more space before we can start allocating, it will // give out a slightly higher pointer. Except QEMU, which // is buggy, as usual: it won't adjust the pointer upward. // So adjust it upward a little bit ourselves: 1/4 MB to get // away from the running binary image and then round up // to a MB boundary. p = (byte*)ROUND((uintptr)runtime·end + (1<<18), 1<<20); p_size = bitmap_size + spans_size + arena_size + PageSize; p = runtime·SysReserve(p, p_size, &reserved); if(p == nil) runtime·throw("runtime: cannot reserve arena virtual address space"); } // PageSize can be larger than OS definition of page size, // so SysReserve can give us a PageSize-unaligned pointer. // To overcome this we ask for PageSize more and round up the pointer. p1 = (byte*)ROUND((uintptr)p, PageSize); runtime·mheap.spans = (MSpan**)p1; runtime·mheap.bitmap = p1 + spans_size; runtime·mheap.arena_start = p1 + spans_size + bitmap_size; runtime·mheap.arena_used = runtime·mheap.arena_start; runtime·mheap.arena_end = p + p_size; runtime·mheap.arena_reserved = reserved; if(((uintptr)runtime·mheap.arena_start & (PageSize-1)) != 0) runtime·throw("misrounded allocation in mallocinit"); // Initialize the rest of the allocator. runtime·MHeap_Init(&runtime·mheap); g->m->mcache = runtime·allocmcache(); }