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Account for CALL instructions before looking up the function

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at PC, to deal with functions that end with a CALL
instruction.  Special case known call-by-return functions.

R=rsc
APPROVED=rsc
DELTA=12  (6 added, 6 deleted, 0 changed)
OCL=33255
CL=33279
This commit is contained in:
Austin Clements 2009-08-14 11:09:53 -07:00
parent 00274a13cb
commit 63810f840f
2 changed files with 6 additions and 6 deletions
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6
src/pkg/runtime/386/traceback.c
View File

@ -34,10 +34,12 @@ traceback(byte *pc0, byte *sp, G *g)
sp = stk->gobuf.sp;
stk = (Stktop*)stk->stackbase;
}
p = (byte*)pc;
if(n > 0 && pc != (uint64)goexit)
pc--; // get to CALL instruction
f = findfunc(pc);
if(f == nil) {
// dangerous, but poke around to see if it is a closure
p = (byte*)pc;
// ADDL $xxx, SP; RET
if(p != 0 && p[0] == 0x81 && p[1] == 0xc4 && p[6] == 0xc3) {
sp += *(uint32*)(p+2) + 8;
@ -60,8 +62,6 @@ traceback(byte *pc0, byte *sp, G *g)
printf("%S", f->name);
if(pc > f->entry)
printf("+%p", (uintptr)(pc - f->entry));
if(n > 0)
pc--; // get to CALL instruction
printf(" %S:%d\n", f->src, funcline(f, pc));
printf("\t%S(", f->name);
for(i = 0; i < f->args; i++) {

6
src/pkg/runtime/amd64/traceback.c
View File

@ -31,10 +31,12 @@ traceback(byte *pc0, byte *sp, G *g)
sp = stk->gobuf.sp;
stk = (Stktop*)stk->stackbase;
}
p = (byte*)pc;
if(n > 0 && pc != (uint64)goexit)
pc--; // get to CALL instruction
f = findfunc(pc);
if(f == nil) {
// dangerous, but poke around to see if it is a closure
p = (byte*)pc;
// ADDQ $xxx, SP; RET
if(p[0] == 0x48 && p[1] == 0x81 && p[2] == 0xc4 && p[7] == 0xc3) {
sp += *(uint32*)(p+3) + 8;
@ -57,8 +59,6 @@ traceback(byte *pc0, byte *sp, G *g)
printf("%S", f->name);
if(pc > f->entry)
printf("+%p", (uintptr)(pc - f->entry));
if(n > 0)
pc--; // get to CALL instruction
printf(" %S:%d\n", f->src, funcline(f, pc));
printf("\t%S(", f->name);
for(i = 0; i < f->args; i++) {