mirror of
https://github.com/golang/go
synced 2024-11-24 22:57:57 -07:00
6l/8l: emit DWARF frame info.
R=rsc, ken2, r CC=golang-dev https://golang.org/cl/2151044
This commit is contained in:
Luuk van Dijk
parent
8e5f673dac
commit
eb572e0174
@ -95,6 +95,7 @@ struct Prog
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Prog* dlink;
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Prog* pcond; /* work on this */
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vlong pc;
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int32 spadj;
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int32 line;
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short as;
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char ft; /* oclass cache */
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@ -463,3 +464,9 @@ uint32 machheadr(void);
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#pragma varargck type "R" int
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#pragma varargck type "A" int
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#pragma varargck argpos diag 1
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/* Used by ../ld/dwarf.c */
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enum
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{
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DWARFREGSP = 7
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};
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@ -843,6 +843,7 @@ dostkoff(void)
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p->as = AADJSP;
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p->from.type = D_CONST;
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p->from.offset = autoffset;
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p->spadj = autoffset;
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if(q != P)
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q->pcond = p;
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}
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@ -903,26 +904,32 @@ dostkoff(void)
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case APUSHL:
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case APUSHFL:
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deltasp += 4;
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p->spadj = 4;
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continue;
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case APUSHQ:
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case APUSHFQ:
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deltasp += 8;
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p->spadj = 8;
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continue;
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case APUSHW:
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case APUSHFW:
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deltasp += 2;
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p->spadj = 2;
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continue;
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case APOPL:
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case APOPFL:
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deltasp -= 4;
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p->spadj = -4;
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continue;
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case APOPQ:
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case APOPFQ:
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deltasp -= 8;
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p->spadj = -8;
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continue;
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case APOPW:
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case APOPFW:
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deltasp -= 2;
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p->spadj = -2;
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continue;
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case ARET:
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break;
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@ -937,7 +944,7 @@ dostkoff(void)
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p->as = AADJSP;
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p->from.type = D_CONST;
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p->from.offset = -autoffset;
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p->spadj = -autoffset;
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p = appendp(p);
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p->as = ARET;
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}
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@ -954,6 +961,7 @@ dostkoff(void)
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q->from = zprg.from;
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q->from.type = D_CONST;
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q->from.offset = -autoffset;
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q->spadj = -autoffset;
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q->to = zprg.to;
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continue;
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}
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@ -95,6 +95,7 @@ struct Prog
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Prog* dlink;
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Prog* pcond; /* work on this */
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int32 pc;
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int32 spadj;
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int32 line;
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short as;
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char width; /* fake for DATA */
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@ -412,3 +413,9 @@ void deadcode(void);
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#pragma varargck type "P" Prog*
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#pragma varargck type "R" int
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#pragma varargck type "A" int
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/* Used by ../ld/dwarf.c */
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enum
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{
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DWARFREGSP = 4
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};
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@ -770,6 +770,7 @@ dostkoff(void)
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p->as = AADJSP;
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p->from.type = D_CONST;
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p->from.offset = autoffset;
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p->spadj = autoffset;
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if(q != P)
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q->pcond = p;
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}
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@ -792,18 +793,22 @@ dostkoff(void)
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case APUSHL:
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case APUSHFL:
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deltasp += 4;
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p->spadj = 4;
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continue;
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case APUSHW:
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case APUSHFW:
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deltasp += 2;
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p->spadj = 2;
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continue;
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case APOPL:
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case APOPFL:
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deltasp -= 4;
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p->spadj = -4;
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continue;
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case APOPW:
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case APOPFW:
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deltasp -= 2;
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p->spadj = -2;
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continue;
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case ARET:
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break;
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@ -822,6 +827,7 @@ dostkoff(void)
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q->as = AADJSP;
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q->from.type = D_CONST;
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q->from.offset = -autoffset;
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p->spadj = -autoffset;
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}
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continue;
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@ -836,6 +842,7 @@ dostkoff(void)
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q->from = zprg.from;
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q->from.type = D_CONST;
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q->from.offset = -autoffset;
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p->spadj = -autoffset;
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q->to = zprg.to;
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continue;
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}
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@ -10,7 +10,7 @@
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#include "../ld/macho.h"
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/*
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* Offsets and sizes of the .debug_* sections in the cout file.
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* Offsets and sizes of the debug_* sections in the cout file.
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*/
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static vlong abbrevo;
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@ -19,7 +19,78 @@ static vlong lineo;
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static vlong linesize;
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static vlong infoo;
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static vlong infosize;
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static vlong frameo;
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static vlong framesize;
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/*
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* Basic I/O
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*/
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static void
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addrput(vlong addr)
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{
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switch(PtrSize) {
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case 4:
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LPUT(addr);
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break;
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case 8:
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VPUT(addr);
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break;
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}
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}
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static int
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uleb128enc(uvlong v, char* dst)
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{
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uint8 c, len;
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len = 0;
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do {
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c = v & 0x7f;
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v >>= 7;
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if (v)
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c |= 0x80;
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if (dst)
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*dst++ = c;
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len++;
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} while (c & 0x80);
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return len;
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};
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static int
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sleb128enc(vlong v, char *dst)
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{
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uint8 c, s, len;
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len = 0;
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do {
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c = v & 0x7f;
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s = v & 0x40;
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v >>= 7;
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if ((v != -1 || !s) && (v != 0 || s))
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c |= 0x80;
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if (dst)
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*dst++ = c;
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len++;
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} while(c & 0x80);
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return len;
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}
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static void
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uleb128put(vlong v)
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{
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char buf[10];
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strnput(buf, uleb128enc(v, buf));
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}
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static void
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sleb128put(vlong v)
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{
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char buf[10];
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strnput(buf, sleb128enc(v, buf));
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}
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/*
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* Defining Abbrevs. This is hardcoded, and there will be
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@ -72,13 +143,34 @@ struct DWAbbrev {
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},
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};
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static void
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writeabbrev(void)
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{
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int i, n;
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abbrevo = cpos();
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for (i = 1; i < DW_NABRV; i++) {
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// See section 7.5.3
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uleb128put(i);
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uleb128put(abbrevs[i].tag);
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cput(abbrevs[i].children);
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// 0 is not a valid attr or form, so we can treat this as
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// a string
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n = strlen((char*)abbrevs[i].attr) / 2;
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strnput((char*)abbrevs[i].attr,
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(n+1) * sizeof(DWAttrForm));
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}
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cput(0);
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abbrevsize = cpos() - abbrevo;
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}
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/*
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* Debugging Information Entries and their attributes
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*/
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// for string and block, value contains the length, and data the data,
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// for all others, value is the whole thing and data is null.
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// For DW_CLS_string and _block, value should contain the length, and
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// data the data, for all others, value is the whole thing and data is
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// null.
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typedef struct DWAttr DWAttr;
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struct DWAttr {
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@ -126,46 +218,6 @@ newattr(DWDie *die, uint8 attr, int cls, vlong value, char *data)
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return a;
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}
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static void addrput(vlong addr)
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{
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switch(PtrSize) {
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case 4:
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LPUT(addr);
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break;
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case 8:
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VPUT(addr);
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break;
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}
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}
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static void
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uleb128put(uvlong v)
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{
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uint8 c;
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do {
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c = v & 0x7f;
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v >>= 7;
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if (v) c |= 0x80;
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cput(c);
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} while (c & 0x80);
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};
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static void
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sleb128put(vlong v)
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{
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uint8 c, s;
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do {
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c = v & 0x7f;
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s = c & 0x40;
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v >>= 7;
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if ((v != -1 || !s) && (v != 0 || s))
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c |= 0x80;
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cput(c);
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} while(c & 0x80);
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};
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static void
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putattr(int form, int cls, vlong value, char *data)
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{
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@ -209,11 +261,11 @@ putattr(int form, int cls, vlong value, char *data)
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WPUT(value);
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break;
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case DW_FORM_data4: // constant, lineptr, loclistptr, macptr, rangelistptr
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case DW_FORM_data4: // constant, {line,loclist,mac,rangelist}ptr
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LPUT(value);
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break;
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case DW_FORM_data8: // constant, lineptr, loclistptr, macptr, rangelistptr
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case DW_FORM_data8: // constant, {line,loclist,mac,rangelist}ptr
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VPUT(value);
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break;
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@ -542,28 +594,6 @@ searchhist(vlong absline)
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return lh;
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}
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static void
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writeabbrev(void)
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{
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int i, n;
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abbrevo = cpos();
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for (i = 1; i < DW_NABRV; i++) {
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// See section 7.5.3
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uleb128put(i);
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uleb128put(abbrevs[i].tag);
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cput(abbrevs[i].children);
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// 0 is not a valid attr or form, so we can treat this as
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// a string
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n = strlen((char *) abbrevs[i].attr) / 2;
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strnput((char *) abbrevs[i].attr,
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(n + 1) * sizeof(DWAttrForm));
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}
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cput(0);
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abbrevsize = cpos() - abbrevo;
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}
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static int
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guesslang(char *s)
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{
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@ -616,8 +646,8 @@ flushunit(vlong pc, vlong unitstart)
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{
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vlong here;
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if (dwinfo != 0 && pc != 0) {
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newattr(dwinfo, DW_AT_high_pc, DW_CLS_ADDRESS, pc, 0);
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if (dwinfo != nil && pc != 0) {
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newattr(dwinfo, DW_AT_high_pc, DW_CLS_ADDRESS, pc+1, 0);
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}
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if (unitstart >= 0) {
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@ -641,19 +671,22 @@ writelines(void)
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Sym *s;
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char *unitname;
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vlong unitstart;
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vlong pc, lc, llc, lline;
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vlong pc, epc, lc, llc, lline;
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int currfile;
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int i;
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Linehist *lh;
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q = nil;
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unitstart = -1;
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pc = 0;
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epc = pc = 0;
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lc = 1;
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llc = 1;
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currfile = -1;
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lineo = cpos();
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for (p = textp; p != P; p = p->pcond) {
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curtext = p; // for diag
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s = p->from.sym;
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if (s == nil || s->type != STEXT) {
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diag("->pcond was supposed to loop over STEXT: %P", p);
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@ -663,7 +696,7 @@ writelines(void)
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// Look for history stack. If we find one,
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// we're entering a new compilation unit
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if ((unitname = inithist(p->to.autom)) != 0) {
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flushunit(pc, unitstart);
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flushunit(epc, unitstart);
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unitstart = cpos();
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if(debug['v'] > 1) {
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print("dwarf writelines found %s\n", unitname);
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@ -701,7 +734,7 @@ writelines(void)
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// 4 zeros: the string termination + 3 fields.
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}
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pc = p->pc;
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epc = pc = p->pc;
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currfile = 1;
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lc = 1;
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llc = 1;
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@ -711,7 +744,7 @@ writelines(void)
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cput(DW_LNE_set_address);
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addrput(pc);
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}
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if (!p->from.sym->reachable)
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if (!s->reachable)
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continue;
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if (unitstart < 0) {
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diag("reachable code before seeing any history: %P", p);
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@ -721,11 +754,9 @@ writelines(void)
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dwinfo->child = newdie(dwinfo->child, DW_ABRV_FUNCTION);
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newattr(dwinfo->child, DW_AT_name, DW_CLS_STRING, strlen(s->name), s->name);
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newattr(dwinfo->child, DW_AT_low_pc, DW_CLS_ADDRESS, p->pc, 0);
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if (debug['v'] > 1)
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print("frame offset: %d\n", p->to.offset);
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// newattr(dwinfo->child, DW_AT_return_addr, DW_CLS_BLOCK, p->to.offset, 0);
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for(q = p; q != P && (q == p || q->as != ATEXT); q = q->link) {
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epc = q->pc;
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lh = searchhist(q->line);
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if (lh == nil) {
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diag("corrupt history or bad absolute line: %P", q);
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@ -734,7 +765,7 @@ writelines(void)
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lline = lh->line + q->line - lh->absline;
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if (debug['v'] > 1)
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print("%6llux %s[%lld] %P\n", q->pc, histfile[lh->file], lline, q);
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// Only emit a line program statement if line has changed.
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if (q->line == lc)
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continue;
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if (currfile != lh->file) {
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@ -747,12 +778,130 @@ writelines(void)
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lc = q->line;
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llc = lline;
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}
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newattr(dwinfo->child, DW_AT_high_pc, DW_CLS_ADDRESS, pc, 0);
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newattr(dwinfo->child, DW_AT_high_pc, DW_CLS_ADDRESS, epc+1, 0);
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}
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flushunit(pc, unitstart);
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flushunit(epc, unitstart);
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linesize = cpos() - lineo;
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}
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/*
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* Emit .debug_frame
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*/
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enum
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{
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CIERESERVE = 16,
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DATAALIGNMENTFACTOR = -4,
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FAKERETURNCOLUMN = 16
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};
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static void
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putpccfadelta(vlong deltapc, vlong cfa)
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{
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if (deltapc < 0x40) {
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cput(DW_CFA_advance_loc + deltapc);
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} else if (deltapc < 0x100) {
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cput(DW_CFA_advance_loc1);
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cput(deltapc);
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} else if (deltapc < 0x10000) {
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cput(DW_CFA_advance_loc2);
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WPUT(deltapc);
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} else {
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cput(DW_CFA_advance_loc4);
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LPUT(deltapc);
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}
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cput(DW_CFA_def_cfa_offset_sf);
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sleb128put(cfa / DATAALIGNMENTFACTOR);
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}
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static void
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writeframes(void)
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{
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Prog *p, *q;
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Sym *s;
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vlong fdeo, fdesize, pad, cfa, pc, epc;
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frameo = cpos();
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// Emit the CIE, Section 6.4.1
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LPUT(CIERESERVE); // initial length, must be multiple of PtrSize
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LPUT(0xffffffff); // cid.
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cput(3); // dwarf version
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cput(0); // augmentation ""
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uleb128put(1); // code_alignment_factor
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sleb128put(DATAALIGNMENTFACTOR); // guess
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uleb128put(FAKERETURNCOLUMN); // return_address_register
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cput(DW_CFA_def_cfa);
|
||||
uleb128put(DWARFREGSP); // register SP (**ABI-dependent, defined in l.h)
|
||||
uleb128put(PtrSize); // offset
|
||||
|
||||
cput(DW_CFA_offset + FAKERETURNCOLUMN); // return address
|
||||
uleb128put(-PtrSize / DATAALIGNMENTFACTOR); // at cfa - x*4
|
||||
|
||||
// 4 is to exclude the length field.
|
||||
pad = CIERESERVE + frameo + 4 - cpos();
|
||||
if (pad < 0) {
|
||||
diag("CIERESERVE too small by %lld bytes.", -pad);
|
||||
errorexit();
|
||||
}
|
||||
strnput("", pad);
|
||||
|
||||
for (p = textp; p != P; p = p->pcond) {
|
||||
curtext = p; // for diag
|
||||
s = p->from.sym;
|
||||
if (s == nil || s->type != STEXT) {
|
||||
diag("->pcond was supposed to loop over STEXT: %P", p);
|
||||
continue;
|
||||
}
|
||||
if (!s->reachable)
|
||||
continue;
|
||||
|
||||
fdeo = cpos();
|
||||
// Emit a FDE, Section 6.4.1, starting wit a placeholder.
|
||||
LPUT(0); // length, must be multiple of PtrSize
|
||||
LPUT(0); // Pointer to the CIE above, at offset 0
|
||||
addrput(0); // initial location
|
||||
addrput(0); // address range
|
||||
|
||||
cfa = PtrSize; // CFA starts at sp+PtrSize
|
||||
pc = p->pc;
|
||||
epc = p->pc;
|
||||
|
||||
for(q = p; q != P && (q == p || q->as != ATEXT); q = q->link) {
|
||||
epc = q->pc;
|
||||
if (q->spadj == 0)
|
||||
continue;
|
||||
|
||||
cfa += q->spadj;
|
||||
putpccfadelta(q->pc - pc, cfa);
|
||||
pc = q->pc;
|
||||
}
|
||||
|
||||
fdesize = cpos() - fdeo - 4; // exclude the length field.
|
||||
pad = rnd(fdesize, PtrSize) - fdesize;
|
||||
strnput("", pad);
|
||||
fdesize += pad;
|
||||
cflush();
|
||||
|
||||
// Emit the FDE header for real, Section 6.4.1.
|
||||
seek(cout, fdeo, 0);
|
||||
LPUT(fdesize);
|
||||
LPUT(0);
|
||||
addrput(p->pc);
|
||||
addrput(epc - p->pc);
|
||||
|
||||
cflush();
|
||||
seek(cout, fdeo + 4 + fdesize, 0);
|
||||
}
|
||||
|
||||
cflush();
|
||||
framesize = cpos() - frameo;
|
||||
}
|
||||
|
||||
/*
|
||||
* Walk DWarfDebugInfoEntries, and emit .debug_info
|
||||
*/
|
||||
@ -790,8 +939,17 @@ writeinfo(void)
|
||||
infosize = cpos() - infoo;
|
||||
}
|
||||
|
||||
void
|
||||
dwarfemitdebugsections(void)
|
||||
{
|
||||
writeabbrev();
|
||||
writelines();
|
||||
writeframes();
|
||||
writeinfo();
|
||||
}
|
||||
|
||||
/*
|
||||
* Elf sections.
|
||||
* Elf.
|
||||
*/
|
||||
enum
|
||||
{
|
||||
@ -827,14 +985,6 @@ dwarfaddshstrings(Sym *shstrtab)
|
||||
elfstrdbg[ElfStrDebugStr] = addstring(shstrtab, ".debug_str");
|
||||
}
|
||||
|
||||
void
|
||||
dwarfemitdebugsections(void)
|
||||
{
|
||||
writeabbrev();
|
||||
writelines();
|
||||
writeinfo();
|
||||
}
|
||||
|
||||
void
|
||||
dwarfaddelfheaders(void)
|
||||
{
|
||||
@ -852,6 +1002,12 @@ dwarfaddelfheaders(void)
|
||||
sh->size = linesize;
|
||||
sh->addralign = 1;
|
||||
|
||||
sh = newElfShdr(elfstrdbg[ElfStrDebugFrame]);
|
||||
sh->type = SHT_PROGBITS;
|
||||
sh->off = frameo;
|
||||
sh->size = framesize;
|
||||
sh->addralign = 1;
|
||||
|
||||
sh = newElfShdr(elfstrdbg[ElfStrDebugInfo]);
|
||||
sh->type = SHT_PROGBITS;
|
||||
sh->off = infoo;
|
||||
@ -859,6 +1015,9 @@ dwarfaddelfheaders(void)
|
||||
sh->addralign = 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Macho
|
||||
*/
|
||||
void
|
||||
dwarfaddmachoheaders(void)
|
||||
{
|
||||
@ -873,7 +1032,7 @@ dwarfaddmachoheaders(void)
|
||||
|
||||
ms = newMachoSeg("__DWARF", 3);
|
||||
ms->fileoffset = fakestart;
|
||||
ms->filesize = abbrevo-fakestart + abbrevsize+linesize+infosize;
|
||||
ms->filesize = abbrevo-fakestart + abbrevsize+linesize+framesize+infosize;
|
||||
|
||||
msect = newMachoSect(ms, "__debug_abbrev");
|
||||
msect->off = abbrevo;
|
||||
@ -883,6 +1042,10 @@ dwarfaddmachoheaders(void)
|
||||
msect->off = lineo;
|
||||
msect->size = linesize;
|
||||
|
||||
msect = newMachoSect(ms, "__debug_frame");
|
||||
msect->off = frameo;
|
||||
msect->size = framesize;
|
||||
|
||||
msect = newMachoSect(ms, "__debug_info");
|
||||
msect->off = infoo;
|
||||
msect->size = infosize;
|
||||
|
||||
@ -452,3 +452,39 @@ enum
|
||||
DW_MACINFO_end_file = 0x04,
|
||||
DW_MACINFO_vendor_ext = 0xff,
|
||||
};
|
||||
|
||||
// Table 40.
|
||||
enum
|
||||
{ // operand,...
|
||||
DW_CFA_nop = 0x00,
|
||||
DW_CFA_set_loc = 0x01, // address
|
||||
DW_CFA_advance_loc1 = 0x02, // 1-byte delta
|
||||
DW_CFA_advance_loc2 = 0x03, // 2-byte delta
|
||||
DW_CFA_advance_loc4 = 0x04, // 4-byte delta
|
||||
DW_CFA_offset_extended = 0x05, // ULEB128 register, ULEB128 offset
|
||||
DW_CFA_restore_extended = 0x06, // ULEB128 register
|
||||
DW_CFA_undefined = 0x07, // ULEB128 register
|
||||
DW_CFA_same_value = 0x08, // ULEB128 register
|
||||
DW_CFA_register = 0x09, // ULEB128 register, ULEB128 register
|
||||
DW_CFA_remember_state = 0x0a,
|
||||
DW_CFA_restore_state = 0x0b,
|
||||
DW_CFA_def_cfa = 0x0c, // ULEB128 register, ULEB128 offset
|
||||
DW_CFA_def_cfa_register = 0x0d, // ULEB128 register
|
||||
DW_CFA_def_cfa_offset = 0x0e, // ULEB128 offset
|
||||
DW_CFA_def_cfa_expression = 0x0f, // BLOCK
|
||||
DW_CFA_expression = 0x10, // ULEB128 register, BLOCK
|
||||
DW_CFA_offset_extended_sf = 0x11, // ULEB128 register, SLEB128 offset
|
||||
DW_CFA_def_cfa_sf = 0x12, // ULEB128 register, SLEB128 offset
|
||||
DW_CFA_def_cfa_offset_sf = 0x13, // SLEB128 offset
|
||||
DW_CFA_val_offset = 0x14, // ULEB128, ULEB128
|
||||
DW_CFA_val_offset_sf = 0x15, // ULEB128, SLEB128
|
||||
DW_CFA_val_expression = 0x16, // ULEB128, BLOCK
|
||||
|
||||
DW_CFA_lo_user = 0x1c,
|
||||
DW_CFA_hi_user = 0x3f,
|
||||
|
||||
// Opcodes that take an addend operand.
|
||||
DW_CFA_advance_loc = 0x1<<6, // +delta
|
||||
DW_CFA_offset = 0x2<<6, // +register (ULEB128 offset)
|
||||
DW_CFA_restore = 0x3<<6, // +register
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user