mirror of
https://github.com/golang/go
synced 2024-11-21 14:04:41 -07:00
gopack: simplify go metadata code
There's only one Go object file per package now, so there's no need to parse the metadata and merge metadata from multiple files. Just save the original and use it as __.PKGDEF verbatim. R=r CC=golang-dev https://golang.org/cl/1647042
This commit is contained in:
Russ Cox
parent
d20ad1c75a
commit
ee0bca35a4
@ -630,7 +630,7 @@ scanobj(Biobuf *b, Arfile *ap, long size)
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}
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/*
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* does line contain substring (length-limited)
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* does line contain substring (length-limited)
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*/
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int
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strstrn(char *line, int len, char *sub)
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@ -646,7 +646,26 @@ strstrn(char *line, int len, char *sub)
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}
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/*
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* Extract the package definition data from an object file
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* package import data
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*/
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char* pkgname;
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char* importblock;
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void
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getpkgdef(char **datap, int *lenp)
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{
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if(pkgname == nil) {
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pkgname = "__emptyarchive__";
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importblock = "";
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}
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*datap = smprint("import\n$$\npackage %s\n%s\n$$\n", pkgname, importblock);
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*lenp = strlen(*datap);
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}
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/*
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* extract the package definition data from an object file.
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* there can be only one.
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*/
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void
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scanpkg(Biobuf *b, long size)
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@ -702,6 +721,13 @@ foundstart:
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pkg++;
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if(strncmp(pkg, "package ", 8) != 0)
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goto bad;
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pkg += 8;
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data = pkg;
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while(*pkg != ' ' && *pkg != '\n' && *pkg != '\0')
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pkg++;
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pkgname = armalloc(pkg - data + 1);
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memmove(pkgname, data, pkg - data);
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pkgname[pkg-data] = '\0';
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start = Boffset(b); // after package statement
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first = 0;
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continue;
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@ -719,24 +745,21 @@ foundend:
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return;
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if (end == 0)
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goto bad;
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if (pkgstmt == nil) {
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/* this is the first package */
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pkgstmt = arstrdup(pkg);
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} else {
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if (strcmp(pkg, pkgstmt) != 0) {
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fprint(2, "gopack: inconsistent package name\n");
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return;
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}
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if(importblock != nil) {
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fprint(2, "gopack: multiple Go object files\n");
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errors++;
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return;
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}
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pkgsize = end-start;
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data = armalloc(pkgsize);
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data = armalloc(end - start + 1);
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Bseek(b, start, 0);
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if (Bread(b, data, pkgsize) != pkgsize) {
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fprint(2, "gopack: error reading package import section in %s\n", file);
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errors++;
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return;
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}
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loadpkgdata(data, pkgsize);
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data[end-start] = '\0';
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importblock = data;
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}
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/*
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@ -1464,304 +1487,3 @@ arstrdup(char *s)
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}
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/*
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* package import data
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*/
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typedef struct Import Import;
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struct Import
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{
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Import *hash; // next in hash table
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char *prefix; // "type", "var", "func", "const"
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char *name;
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char *def;
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char *file;
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};
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enum {
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NIHASH = 1024
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};
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Import *ihash[NIHASH];
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int nimport;
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Import *
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ilookup(char *name)
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{
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int h;
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Import *x;
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h = hashstr(name) % NIHASH;
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for(x=ihash[h]; x; x=x->hash)
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if(x->name[0] == name[0] && strcmp(x->name, name) == 0)
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return x;
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x = armalloc(sizeof *x);
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x->name = name;
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x->hash = ihash[h];
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ihash[h] = x;
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nimport++;
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return x;
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}
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int parsemethod(char**, char*, char**);
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int parsepkgdata(char**, char*, char**, char**, char**);
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void
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loadpkgdata(char *data, int len)
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{
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char *p, *ep, *prefix, *name, *def;
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Import *x;
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p = data;
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ep = data + len;
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while(parsepkgdata(&p, ep, &prefix, &name, &def) > 0) {
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if(strcmp(prefix, "import") == 0) {
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// backwards from the rest: def is unique, name is not.
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x = ilookup(def);
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if(x->prefix == nil) {
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x->prefix = prefix;
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x->def = name;
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x->file = file;
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} else if(strcmp(x->def, name) != 0) {
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fprint(2, "gopack: conflicting package names for %s\n", def);
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fprint(2, "%s:\t%s\n", x->file, x->def);
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fprint(2, "%s:\t%s\n", file, name);
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errors++;
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}
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continue;
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}
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x = ilookup(name);
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if(x->prefix == nil) {
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x->prefix = prefix;
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x->def = def;
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x->file = file;
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} else if(strcmp(x->prefix, prefix) != 0) {
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fprint(2, "gopack: conflicting definitions for %s\n", name);
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fprint(2, "%s:\t%s %s ...\n", x->file, x->prefix, name);
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fprint(2, "%s:\t%s %s ...\n", file, prefix, name);
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errors++;
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} else if(strcmp(x->def, def) != 0) {
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fprint(2, "gopack: conflicting definitions for %s\n", name);
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fprint(2, "%s:\t%s %s %s\n", x->file, x->prefix, name, x->def);
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fprint(2, "%s:\t%s %s %s\n", file, prefix, name, def);
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errors++;
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}
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}
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}
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int
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parsepkgdata(char **pp, char *ep, char **prefixp, char **namep, char **defp)
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{
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char *p, *prefix, *name, *def, *edef, *meth;
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int n;
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// skip white space
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p = *pp;
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while(p < ep && (*p == ' ' || *p == '\t'))
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p++;
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if(p == ep)
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return 0;
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// prefix: (var|type|func|const)
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prefix = p;
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prefix = p;
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if(p + 7 > ep)
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return -1;
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if(strncmp(p, "var ", 4) == 0)
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p += 4;
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else if(strncmp(p, "type ", 5) == 0)
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p += 5;
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else if(strncmp(p, "func ", 5) == 0)
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p += 5;
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else if(strncmp(p, "const ", 6) == 0)
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p += 6;
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else if(strncmp(p, "import ", 7) == 0)
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p += 7;
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else {
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fprint(2, "gopack: confused in pkg data near <<%.20s>>\n", p);
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errors++;
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return -1;
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}
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p[-1] = '\0';
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// name: a.b followed by space
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name = p;
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while(p < ep && *p != ' ')
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p++;
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if(p >= ep)
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return -1;
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*p++ = '\0';
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// def: free form to new line
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def = p;
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while(p < ep && *p != '\n')
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p++;
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if(p >= ep)
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return -1;
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edef = p;
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*p++ = '\0';
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// include methods on successive lines in def of named type
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while(parsemethod(&p, ep, &meth) > 0) {
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*edef++ = '\n'; // overwrites '\0'
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if(edef+1 > meth) {
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// We want to indent methods with a single \t.
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// 6g puts at least one char of indent before all method defs,
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// so there will be room for the \t. If the method def wasn't
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// indented we could do something more complicated,
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// but for now just diagnose the problem and assume
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// 6g will keep indenting for us.
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fprint(2, "gopack: %s: expected methods to be indented %p %p %.10s\n", file, edef, meth, meth);
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errors++;
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return -1;
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}
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*edef++ = '\t';
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n = strlen(meth);
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memmove(edef, meth, n);
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edef += n;
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}
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// done
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*pp = p;
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*prefixp = prefix;
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*namep = name;
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*defp = def;
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return 1;
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}
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int
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parsemethod(char **pp, char *ep, char **methp)
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{
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char *p;
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// skip white space
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p = *pp;
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while(p < ep && (*p == ' ' || *p == '\t'))
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p++;
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if(p == ep)
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return 0;
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// if it says "func (", it's a method
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if(p + 6 >= ep || strncmp(p, "func (", 6) != 0)
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return 0;
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// definition to end of line
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*methp = p;
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while(p < ep && *p != '\n')
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p++;
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if(p >= ep) {
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fprint(2, "gopack: lost end of line in method definition\n");
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*pp = ep;
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return -1;
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}
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*p++ = '\0';
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*pp = p;
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return 1;
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}
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int
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importcmp(const void *va, const void *vb)
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{
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Import *a, *b;
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int i;
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a = *(Import**)va;
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b = *(Import**)vb;
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i = strcmp(a->prefix, b->prefix);
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if(i != 0) {
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// rewrite so "type" comes first
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if(strcmp(a->prefix, "type") == 0)
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return -1;
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if(strcmp(b->prefix, "type") == 0)
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return 1;
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return i;
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}
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return strcmp(a->name, b->name);
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}
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char*
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strappend(char *s, char *t)
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{
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int n;
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n = strlen(t);
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memmove(s, t, n);
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return s+n;
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}
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void
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getpkgdef(char **datap, int *lenp)
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{
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int i, j, len;
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char *data, *p;
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Import **all, *x;
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if(pkgstmt == nil) {
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// Write out non-empty, parseable __.PKGDEF,
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// so that import of an empty archive works.
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*datap = "import\n$$\npackage __emptypackage__\n$$\n";
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*lenp = strlen(*datap);
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return;
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}
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// make a list of all the exports and count string sizes
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all = armalloc(nimport*sizeof all[0]);
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j = 0;
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len = 7 + 3 + strlen(pkgstmt) + 1; // import\n$$\npkgstmt\n
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for(i=0; i<NIHASH; i++) {
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for(x=ihash[i]; x; x=x->hash) {
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all[j++] = x;
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len += strlen(x->prefix) + 1
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+ strlen(x->name) + 1
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+ strlen(x->def) + 1;
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}
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}
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if(j != nimport) {
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fprint(2, "gopack: import count mismatch (internal error)\n");
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exits("oops");
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}
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len += 3; // $$\n
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// sort exports (unnecessary but nicer to look at)
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qsort(all, nimport, sizeof all[0], importcmp);
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// print them into buffer
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data = armalloc(len);
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// import\n
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// $$\n
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// pkgstmt\n
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p = data;
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p = strappend(p, "import\n$$\n");
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p = strappend(p, pkgstmt);
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p = strappend(p, "\n");
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for(i=0; i<nimport; i++) {
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x = all[i];
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if(strcmp(x->prefix, "import") == 0) {
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// prefix def name\n
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p = strappend(p, x->prefix);
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p = strappend(p, " ");
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p = strappend(p, x->def);
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p = strappend(p, " ");
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p = strappend(p, x->name);
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p = strappend(p, "\n");
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continue;
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}
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// prefix name def\n
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p = strappend(p, x->prefix);
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p = strappend(p, " ");
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p = strappend(p, x->name);
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p = strappend(p, " ");
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p = strappend(p, x->def);
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p = strappend(p, "\n");
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}
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p = strappend(p, "$$\n");
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if(p != data+len) {
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fprint(2, "gopack: internal math error\n");
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exits("oops");
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}
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*datap = data;
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*lenp = len;
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}
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