ld: grow dwarf includestack on demand.

Fixes #2241
while not breaking issue 1878 again.

R=rsc
CC=golang-dev
https://golang.org/cl/4988048

diff --git a/src/cmd/gc/obj.c b/src/cmd/gc/obj.c
index d6fe6f65db7be3d1dcc3a52f7ecc63d6d624c8a2..730b42671c044e3b6896f115aa1a5273c52e8e44 100644 (file)
--- a/src/cmd/gc/obj.c
+++ b/src/cmd/gc/obj.c
@@ -125,7 +125,6 @@ static void
 outhist(Biobuf *b)
 {
        Hist *h;
-       int i, depth = 0;
        char *p, ds[] = {'c', ':', '/', 0};
 
        for(h = hist; h != H; h = h->link) {
@@ -162,14 +161,7 @@ outhist(Biobuf *b)
                                        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);
        }

diff --git a/src/cmd/ld/dwarf.c b/src/cmd/ld/dwarf.c
index d8ca27acea3d7063370a1f9624ed0df366866cdf..77536018a5c4db64e1c52b5550c11362c8d658b0 100644 (file)
--- a/src/cmd/ld/dwarf.c
+++ b/src/cmd/ld/dwarf.c
@@ -1578,13 +1578,16 @@ addhistfile(char *zentry)
                histfile[histfilesize++] = "<eof>";
 
        fname = decodez(zentry);
+//     print("addhistfile %d: %s\n", histfilesize, fname);
        if (fname == 0)
                return -1;
+
        // Don't fill with duplicates (check only top one).
        if (strcmp(fname, histfile[histfilesize-1]) == 0) {
                free(fname);
                return histfilesize - 1;
        }
+
        histfile[histfilesize++] = fname;
        return histfilesize - 1;
 }
@@ -1608,11 +1611,13 @@ finddebugruntimepath(void)
 }
 
 // Go's runtime C sources are sane, and Go sources nest only 1 level,
-// so 16 should be plenty.
+// so a handful would be plenty, if it weren't for the fact that line
+// directives can push an unlimited number of them.
 static struct {
        int file;
        vlong line;
-} includestack[16];
+} *includestack;
+static int includestacksize;
 static int includetop;
 static vlong absline;
 
@@ -1629,17 +1634,15 @@ static Linehist *linehist;
 static void
 checknesting(void)
 {
-       int i;
-
        if (includetop < 0) {
                diag("dwarf: corrupt z stack");
                errorexit();
        }
-       if (includetop >= nelem(includestack)) {
-               diag("dwarf: nesting too deep");
-               for (i = 0; i < nelem(includestack); i++)
-                       diag("\t%s", histfile[includestack[i].file]);
-               errorexit();
+       if (includetop >= includestacksize) {
+               includestacksize += 1;
+               includestacksize <<= 2;
+//             print("checknesting: growing to %d\n", includestacksize);
+               includestack = realloc(includestack, includestacksize * sizeof *includestack);         
        }
 }
 
@@ -1669,6 +1672,7 @@ inithist(Auto *a)
        // Clear the history.
        clearhistfile();
        includetop = 0;
+       checknesting();
        includestack[includetop].file = 0;
        includestack[includetop].line = -1;
        absline = 0;
@@ -1682,10 +1686,10 @@ inithist(Auto *a)
        for (; a; a = a->link) {
                if (a->type == D_FILE) {  // 'z'
                        int f = addhistfile(a->asym->name);
-                       if (f < 0) {       // pop file
+                       if (f < 0) {    // pop file
                                includetop--;
                                checknesting();
-                       } else if(f != includestack[includetop].file) { // pushed a new file
+                       } else {        // pushed a file (potentially same)
                                includestack[includetop].line += a->aoffset - absline;
                                includetop++;
                                checknesting();

diff --git a/test/dwarf/linedirectives.go b/test/dwarf/linedirectives.go
new file mode 100755 (executable)
index 0000000..68434f0
--- /dev/null
+++ b/test/dwarf/linedirectives.go
@@ -0,0 +1,83 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//line foo/bar.y:4
+package main
+//line foo/bar.y:60
+func main() { 
+//line foo/bar.y:297
+       f, l := 0, 0
+//line yacctab:1
+       f, l = 1, 1
+//line yaccpar:1
+       f, l = 2, 1
+//line foo/bar.y:82
+       f, l = 3, 82
+//line foo/bar.y:90
+       f, l = 3, 90
+//line foo/bar.y:92
+       f, l = 3, 92
+//line foo/bar.y:100
+       f, l = 3, 100
+//line foo/bar.y:104
+       l = 104
+//line foo/bar.y:112
+       l = 112
+//line foo/bar.y:117
+       l = 117
+//line foo/bar.y:121
+       l = 121
+//line foo/bar.y:125
+       l = 125
+//line foo/bar.y:133
+       l = 133
+//line foo/bar.y:146
+       l = 146
+//line foo/bar.y:148
+//line foo/bar.y:153
+//line foo/bar.y:155
+       l = 155
+//line foo/bar.y:160
+
+//line foo/bar.y:164
+//line foo/bar.y:173
+
+//line foo/bar.y:178
+//line foo/bar.y:180
+//line foo/bar.y:185
+//line foo/bar.y:195
+//line foo/bar.y:197
+//line foo/bar.y:202
+//line foo/bar.y:204
+//line foo/bar.y:208
+//line foo/bar.y:211
+//line foo/bar.y:213
+//line foo/bar.y:215
+//line foo/bar.y:217
+//line foo/bar.y:221
+//line foo/bar.y:229
+//line foo/bar.y:236
+//line foo/bar.y:238
+//line foo/bar.y:240
+//line foo/bar.y:244
+//line foo/bar.y:249
+//line foo/bar.y:253
+//line foo/bar.y:257
+//line foo/bar.y:262
+//line foo/bar.y:267
+//line foo/bar.y:272
+       if l == f {
+//line foo/bar.y:277
+       panic("aie!")
+//line foo/bar.y:281
+       }
+//line foo/bar.y:285
+       return
+//line foo/bar.y:288
+//line foo/bar.y:290
+}
+//line foo/bar.y:293
+//line foo/bar.y:295

diff --git a/test/dwarf/main.go b/test/dwarf/main.go
new file mode 100644 (file)
index 0000000..7f2ec4c
--- /dev/null
+++ b/test/dwarf/main.go
@@ -0,0 +1,29 @@
+// $G $D/$F.go $D/z*.go && $L $F.$A && ./$A.out
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+func main() {
+F1()
+F2()
+F3()
+F4()
+F5()
+F6()
+F7()
+F8()
+F9()
+F10()
+F11()
+F12()
+F13()
+F14()
+F15()
+F16()
+F17()
+F18()
+F19()
+F20()
+}

diff --git a/test/dwarf/z1.go b/test/dwarf/z1.go
new file mode 100644 (file)
index 0000000..7f163e9
--- /dev/null
+++ b/test/dwarf/z1.go
@@ -0,0 +1,5 @@
+
+
+//line x1.go:4
+package main
+func F1() {}

diff --git a/test/dwarf/z10.go b/test/dwarf/z10.go
new file mode 100644 (file)
index 0000000..19c7002
--- /dev/null
+++ b/test/dwarf/z10.go
@@ -0,0 +1,6 @@
+
+
+
+//line x10.go:4
+package main
+func F10() {}

diff --git a/test/dwarf/z11.go b/test/dwarf/z11.go
new file mode 100644 (file)
index 0000000..c1d2f91
--- /dev/null
+++ b/test/dwarf/z11.go
@@ -0,0 +1,4 @@
+
+//line x11.go:4
+package main
+func F11() {}

diff --git a/test/dwarf/z12.go b/test/dwarf/z12.go
new file mode 100644 (file)
index 0000000..7455f18
--- /dev/null
+++ b/test/dwarf/z12.go
@@ -0,0 +1,4 @@
+
+//line x12.go:4
+package main
+func F12() {}

diff --git a/test/dwarf/z13.go b/test/dwarf/z13.go
new file mode 100644 (file)
index 0000000..ecb3c4c
--- /dev/null
+++ b/test/dwarf/z13.go
@@ -0,0 +1,4 @@
+
+//line x13.go:4
+package main
+func F13() {}

diff --git a/test/dwarf/z14.go b/test/dwarf/z14.go
new file mode 100644 (file)
index 0000000..134b39b
--- /dev/null
+++ b/test/dwarf/z14.go
@@ -0,0 +1,4 @@
+
+//line x14.go:4
+package main
+func F14() {}

diff --git a/test/dwarf/z15.go b/test/dwarf/z15.go
new file mode 100644 (file)
index 0000000..d73819b
--- /dev/null
+++ b/test/dwarf/z15.go
@@ -0,0 +1,4 @@
+
+//line x15.go:4
+package main
+func F15() {}

diff --git a/test/dwarf/z16.go b/test/dwarf/z16.go
new file mode 100644 (file)
index 0000000..6c31651
--- /dev/null
+++ b/test/dwarf/z16.go
@@ -0,0 +1,4 @@
+
+//line x16.go:4
+package main
+func F16() {}

diff --git a/test/dwarf/z17.go b/test/dwarf/z17.go
new file mode 100644 (file)
index 0000000..b742d16
--- /dev/null
+++ b/test/dwarf/z17.go
@@ -0,0 +1,4 @@
+
+//line x17.go:4
+package main
+func F17() {}

diff --git a/test/dwarf/z18.go b/test/dwarf/z18.go
new file mode 100644 (file)
index 0000000..84150ff
--- /dev/null
+++ b/test/dwarf/z18.go
@@ -0,0 +1,5 @@
+
+
+//line x18.go:4
+package main
+func F18() {}

diff --git a/test/dwarf/z19.go b/test/dwarf/z19.go
new file mode 100644 (file)
index 0000000..bb2e296
--- /dev/null
+++ b/test/dwarf/z19.go
@@ -0,0 +1,4 @@
+
+//line x19.go:4
+package main
+func F19() {}

diff --git a/test/dwarf/z2.go b/test/dwarf/z2.go
new file mode 100644 (file)
index 0000000..68bd582
--- /dev/null
+++ b/test/dwarf/z2.go
@@ -0,0 +1,4 @@
+
+//line x2.go:4
+package main
+func F2() {}

diff --git a/test/dwarf/z20.go b/test/dwarf/z20.go
new file mode 100644 (file)
index 0000000..03111e1
--- /dev/null
+++ b/test/dwarf/z20.go
@@ -0,0 +1,4 @@
+
+//line x20.go:4
+package main
+func F20() {}

diff --git a/test/dwarf/z3.go b/test/dwarf/z3.go
new file mode 100644 (file)
index 0000000..5e4ad3a
--- /dev/null
+++ b/test/dwarf/z3.go
@@ -0,0 +1,4 @@
+
+//line x3.go:4
+package main
+func F3() {}

diff --git a/test/dwarf/z4.go b/test/dwarf/z4.go
new file mode 100644 (file)
index 0000000..1f28465
--- /dev/null
+++ b/test/dwarf/z4.go
@@ -0,0 +1,4 @@
+
+//line x4.go:4
+package main
+func F4() {}

diff --git a/test/dwarf/z5.go b/test/dwarf/z5.go
new file mode 100644 (file)
index 0000000..7f4eeb4
--- /dev/null
+++ b/test/dwarf/z5.go
@@ -0,0 +1,4 @@
+
+//line x5.go:4
+package main
+func F5() {}

diff --git a/test/dwarf/z6.go b/test/dwarf/z6.go
new file mode 100644 (file)
index 0000000..241791d
--- /dev/null
+++ b/test/dwarf/z6.go
@@ -0,0 +1,4 @@
+
+//line x6.go:4
+package main
+func F6() {}

diff --git a/test/dwarf/z7.go b/test/dwarf/z7.go
new file mode 100644 (file)
index 0000000..68c1ad0
--- /dev/null
+++ b/test/dwarf/z7.go
@@ -0,0 +1,4 @@
+
+//line x7.go:4
+package main
+func F7() {}

diff --git a/test/dwarf/z8.go b/test/dwarf/z8.go
new file mode 100644 (file)
index 0000000..16eed32
--- /dev/null
+++ b/test/dwarf/z8.go
@@ -0,0 +1,4 @@
+
+//line x8.go:4
+package main
+func F8() {}

diff --git a/test/dwarf/z9.go b/test/dwarf/z9.go
new file mode 100644 (file)
index 0000000..cbb94b4
--- /dev/null
+++ b/test/dwarf/z9.go
@@ -0,0 +1,4 @@
+
+//line x9.go:4
+package main
+func F9() {}

diff --git a/test/golden.out b/test/golden.out
index 624b2119f91490e49df8a5b5fb8a45be371af3dc..1942f45fbe632fa95f8dd6d717c38dbcd4a15c2b 100644 (file)
--- a/test/golden.out
+++ b/test/golden.out
@@ -115,6 +115,8 @@ panic: interface conversion: *main.S is not main.I2: missing method Name
 
 == syntax/
 
+== dwarf/
+
 == fixedbugs/
 
 =========== fixedbugs/bug027.go

diff --git a/test/run b/test/run
index d6f57272c72e39fd4aeb9fc80b6617a8ee8ab4c7..844ee5fecad14cf45769d5a1848bb930e059b468 100755 (executable)
--- a/test/run
+++ b/test/run
@@ -53,7 +53,7 @@ filterout() {
        grep '^'"$2"'$' $1 >/dev/null
 }
 
-for dir in . ken chan interface nilptr syntax fixedbugs bugs
+for dir in . ken chan interface nilptr syntax dwarf fixedbugs bugs
 do
        echo
        echo '==' $dir'/'