Mercurial > projects > ldc
view lphobos/gc/gcbits.d @ 1351:8d501abecd24
Initial (but disabled) fix for ticket #294 , the actual part that fixes the bug is in a #if 0 block as I'm afraid it will cause regressions. I'm most likely not going to be around tonight, and maybe not tomorrow as well, so I'm pushing it in case someone wants to run some serious testing/investigate the problem noted in llvmhelpers.cpp : realignOffset .
author | Tomas Lindquist Olsen <tomas.l.olsen gmail com> |
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date | Thu, 14 May 2009 17:20:17 +0200 |
parents | 373489eeaf90 |
children |
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// Copyright (C) 2001-2002 by Digital Mars // All Rights Reserved // www.digitalmars.com // Written by Walter Bright /* NOTE: This file has been patched from the original DMD distribution to work with the GDC compiler. Modified by David Friedman, September 2004 */ import std.c.string; import std.c.stdlib; import std.outofmemory; import std.intrinsic; //version = Asm86; version (GNU) { // bitop intrinsics not implemented yet } else { version = bitops; } struct GCBits { const int BITS_PER_WORD = 32; const int BITS_SHIFT = 5; const int BITS_MASK = 31; uint *data = null; uint nwords = 0; // allocated words in data[] excluding sentinals uint nbits = 0; // number of bits in data[] excluding sentinals void Dtor() { if (data) { free(data); data = null; } } invariant { if (data) { assert(nwords * data[0].sizeof * 8 >= nbits); } } void alloc(uint nbits) { this.nbits = nbits; nwords = (nbits + (BITS_PER_WORD - 1)) >> BITS_SHIFT; data = cast(uint *)calloc(nwords + 2, uint.sizeof); if (!data) _d_OutOfMemory(); } uint test(uint i) in { assert(i < nbits); } body { //return (cast(bit *)(data + 1))[i]; return data[1 + (i >> BITS_SHIFT)] & (1 << (i & BITS_MASK)); } void set(uint i) in { assert(i < nbits); } body { //(cast(bit *)(data + 1))[i] = 1; data[1 + (i >> BITS_SHIFT)] |= (1 << (i & BITS_MASK)); } void clear(uint i) in { assert(i < nbits); } body { //(cast(bit *)(data + 1))[i] = 0; data[1 + (i >> BITS_SHIFT)] &= ~(1 << (i & BITS_MASK)); } uint testClear(uint i) { version (bitops) { return std.intrinsic.btr(data + 1, i); } else version (Asm86) { asm { naked ; mov EAX,data[EAX] ; mov ECX,i-4[ESP] ; btr 4[EAX],ECX ; sbb EAX,EAX ; ret 4 ; } } else { uint result; //result = (cast(bit *)(data + 1))[i]; //(cast(bit *)(data + 1))[i] = 0; uint *p = &data[1 + (i >> BITS_SHIFT)]; uint mask = (1 << (i & BITS_MASK)); result = *p & mask; *p &= ~mask; return result; } } void zero() { memset(data + 1, 0, nwords * uint.sizeof); } void copy(GCBits *f) in { assert(nwords == f.nwords); } body { memcpy(data + 1, f.data + 1, nwords * uint.sizeof); } uint *base() in { assert(data); } body { return data + 1; } } unittest { GCBits b; b.alloc(786); assert(b.test(123) == 0); assert(b.testClear(123) == 0); b.set(123); assert(b.test(123) != 0); assert(b.testClear(123) != 0); assert(b.test(123) == 0); b.set(785); b.set(0); assert(b.test(785) != 0); assert(b.test(0) != 0); b.zero(); assert(b.test(785) == 0); assert(b.test(0) == 0); GCBits b2; b2.alloc(786); b2.set(38); b.copy(&b2); assert(b.test(38) != 0); b2.Dtor(); b.Dtor(); } /+ void main() { } +/