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https://github.com/golang/go
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more morestack fiddling
R=r OCL=28204 CL=28204
This commit is contained in:
Ken Thompson
parent
a5a878986c
commit
5963f59067
@ -477,40 +477,52 @@ brloop(Prog *p)
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return q;
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}
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static char*
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morename[] =
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{
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"sys·morestack00",
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"sys·morestack10",
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"sys·morestack01",
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"sys·morestack11",
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"sys·morestack8",
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"sys·morestack16",
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"sys·morestack24",
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"sys·morestack32",
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"sys·morestack40",
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"sys·morestack48",
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};
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Prog* pmorestack[nelem(morename)];
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Sym* symmorestack[nelem(morename)];
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void
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dostkoff(void)
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{
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Prog *p, *q, *q1;
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int32 autoffset, deltasp;
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int a, f, curframe, curbecome, maxbecome, pcsize;
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Prog *pmorestack00, *pmorestack01, *pmorestack10, *pmorestack11;
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Sym *symmorestack00, *symmorestack01, *symmorestack10, *symmorestack11;
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uint32 moreconst1, moreconst2;
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uint32 moreconst1, moreconst2, i;
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pmorestack00 = P;
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pmorestack01 = P;
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pmorestack10 = P;
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pmorestack11 = P;
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symmorestack00 = lookup("sys·morestack00", 0);
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symmorestack01 = lookup("sys·morestack01", 0);
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symmorestack10 = lookup("sys·morestack10", 0);
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symmorestack11 = lookup("sys·morestack11", 0);
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for(i=0; i<nelem(morename); i++) {
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symmorestack[i] = lookup(morename[i], 0);
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pmorestack[i] = P;
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}
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for(p = firstp; p != P; p = p->link) {
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if(p->as == ATEXT) {
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if(p->from.sym == symmorestack00)
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pmorestack00 = p;
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if(p->from.sym == symmorestack01)
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pmorestack01 = p;
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if(p->from.sym == symmorestack10)
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pmorestack10 = p;
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if(p->from.sym == symmorestack11)
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pmorestack11 = p;
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for(i=0; i<nelem(morename); i++) {
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if(p->from.sym == symmorestack[i]) {
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pmorestack[i] = p;
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break;
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}
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}
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}
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}
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if(pmorestack00 == P || pmorestack01 == P || pmorestack10 == P || pmorestack11 == P)
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diag("sys·morestack[01][01] not defined");
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for(i=0; i<nelem(morename); i++) {
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if(pmorestack[i] == P)
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diag("morestack trampoline not defined");
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}
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curframe = 0;
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curbecome = 0;
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@ -662,13 +674,14 @@ dostkoff(void)
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moreconst1 = (autoffset+160) & ~7LL;
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moreconst2 = textarg;
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// four varieties (const1==0 cross const2==0)
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// 4 varieties varieties (const1==0 cross const2==0)
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// and 6 subvarieties of (const1==0 and const2!=0)
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p = appendp(p);
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if(moreconst1 == 0 && moreconst2 == 0) {
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p->as = ACALL;
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p->to.type = D_BRANCH;
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p->pcond = pmorestack00;
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p->to.sym = symmorestack00;
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p->pcond = pmorestack[0];
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p->to.sym = symmorestack[0];
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if(q1) {
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q1->pcond = p;
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q1 = P;
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@ -687,8 +700,19 @@ dostkoff(void)
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p = appendp(p);
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p->as = ACALL;
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p->to.type = D_BRANCH;
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p->pcond = pmorestack10;
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p->to.sym = symmorestack10;
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p->pcond = pmorestack[1];
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p->to.sym = symmorestack[1];
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} else
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if(moreconst1 == 0 && moreconst2 <= 48 && moreconst2%8 == 0) {
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i = moreconst2/8 + 3;
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p->as = ACALL;
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p->to.type = D_BRANCH;
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p->pcond = pmorestack[i];
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p->to.sym = symmorestack[i];
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if(q1) {
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q1->pcond = p;
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q1 = P;
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}
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} else
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if(moreconst1 == 0 && moreconst2 != 0) {
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p->as = AMOVL;
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@ -703,10 +727,9 @@ dostkoff(void)
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p = appendp(p);
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p->as = ACALL;
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p->to.type = D_BRANCH;
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p->pcond = pmorestack01;
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p->to.sym = symmorestack01;
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p->pcond = pmorestack[2];
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p->to.sym = symmorestack[2];
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} else {
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p->as = AMOVQ;
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p->from.type = D_CONST;
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p->from.offset = (uint64)moreconst2 << 32;
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@ -720,8 +743,8 @@ dostkoff(void)
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p = appendp(p);
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p->as = ACALL;
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p->to.type = D_BRANCH;
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p->pcond = pmorestack11;
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p->to.sym = symmorestack11;
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p->pcond = pmorestack[3];
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p->to.sym = symmorestack[3];
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}
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}
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@ -947,14 +970,18 @@ export(void)
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n = 0;
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for(i = 0; i < NHASH; i++)
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for(s = hash[i]; s != S; s = s->link)
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if(s->sig != 0 && s->type != SXREF && s->type != SUNDEF && (nexports == 0 || s->subtype == SEXPORT))
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if(s->sig != 0 && s->type != SXREF &&
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s->type != SUNDEF &&
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(nexports == 0 || s->subtype == SEXPORT))
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n++;
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esyms = malloc(n*sizeof(Sym*));
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ne = n;
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n = 0;
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for(i = 0; i < NHASH; i++)
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for(s = hash[i]; s != S; s = s->link)
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if(s->sig != 0 && s->type != SXREF && s->type != SUNDEF && (nexports == 0 || s->subtype == SEXPORT))
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if(s->sig != 0 && s->type != SXREF &&
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s->type != SUNDEF &&
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(nexports == 0 || s->subtype == SEXPORT))
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esyms[n++] = s;
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for(i = 0; i < ne-1; i++)
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for(j = i+1; j < ne; j++)
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@ -572,16 +572,37 @@ sweeplist(Prog **first, Prog **last)
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*last = q;
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}
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static char*
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morename[] =
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{
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"sys·morestack",
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"sys·morestackx",
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"sys·morestack00",
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"sys·morestack10",
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"sys·morestack01",
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"sys·morestack11",
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"sys·morestack8",
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"sys·morestack16",
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"sys·morestack24",
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"sys·morestack32",
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"sys·morestack40",
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"sys·morestack48",
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};
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void
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deadcode(void)
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{
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int i;
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if(debug['v'])
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Bprint(&bso, "%5.2f deadcode\n", cputime());
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mark(lookup(INITENTRY, 0));
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mark(lookup("sys·morestack", 0));
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for(i=0; i<nelem(morename); i++)
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mark(lookup(morename[i], 0));
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sweeplist(&firstp, &lastp);
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sweeplist(&datap, &edatap);
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}
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@ -111,6 +111,45 @@ TEXT sys·morestack11+0(SB),7,$0
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MOVQ $sys·morestack+0(SB), AX
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JMP AX
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TEXT sys·morestackx(SB),7,$0
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POPQ AX
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SHLQ $35, AX
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MOVQ AX, 8(R14)
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MOVQ $sys·morestack(SB), AX
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JMP AX
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// subcases of morestack01
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// with const of 8,16,...48
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TEXT sys·morestack8(SB),7,$0
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PUSHQ $1
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MOVQ $sys·morestackx(SB), AX
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JMP AX
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TEXT sys·morestack16(SB),7,$0
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PUSHQ $2
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MOVQ $sys·morestackx(SB), AX
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JMP AX
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TEXT sys·morestack24(SB),7,$0
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PUSHQ $3
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MOVQ $sys·morestackx(SB), AX
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JMP AX
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TEXT sys·morestack32(SB),7,$0
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PUSHQ $4
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MOVQ $sys·morestackx(SB), AX
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JMP AX
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TEXT sys·morestack40(SB),7,$0
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PUSHQ $5
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MOVQ $sys·morestackx(SB), AX
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JMP AX
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TEXT sys·morestack48(SB),7,$0
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PUSHQ $6
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MOVQ $sys·morestackx(SB), AX
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JMP AX
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// return point when leaving new stack. save AX, jmp to lessstack to switch back
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TEXT retfromnewstack(SB), 7, $0
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MOVQ AX, 16(R14) // save AX in m->cret
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