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gc: fix pc/line table

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When a line directive was encountered we would push a new 'z' entry into
the history to indicate the start of new file attributation, and a 'Z'
entry to change line numbering.  However we didn't pop the 'z' entry, so
we were actually corrupting the history stack.  The most obvious
occurance of this was in the code that build the symbol tables for the
DWARF information - where an internal stack in the linker would overflow
when more than a few line directives were encountered in a single stack
(Issue 1878).  So now we pop the 'z' entry when we encounter the end of
the file that the directive was in, which maintains the history stack
integrity.

Also, although new 'z' entries for new files had relative paths
expanded, the same was not done for line directives.  Now we do it for
line directives also - so that the now correct DWARF information has the
full path available.

Fixes #1878.

R=rsc
CC=golang-dev
https://golang.org/cl/4938042
This commit is contained in:
Julian Phillips 2011-08-23 17:01:14 -04:00 committed by Russ Cox
parent 33e9d24ad9
commit b99d722963
1 changed files with 10 additions and 1 deletions
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11
src/cmd/gc/obj.c
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@ -127,6 +127,7 @@ static void
outhist(Biobuf *b)
{
Hist *h;
int i, depth = 0;
char *p, ds[] = {'c', ':', '/', 0};
for(h = hist; h != H; h = h->link) {
@ -156,13 +157,21 @@ outhist(Biobuf *b)
outzfile(b, p+1);
} else {
// relative name, like dir/file.go
if(h->offset == 0 && pathname && pathname[0] == '/') {
if(h->offset >= 0 && pathname && pathname[0] == '/') {
zfile(b, "/", 1); // leading "/"
outzfile(b, pathname+1);
}
outzfile(b, p);
}
}
if(h->offset > 0) {
//line directive
depth++;
}
} else if(depth > 0) {
for(i = 0; i < depth; i++)
zhist(b, h->line, h->offset);
depth = 0;
}
zhist(b, h->line, h->offset);
}