| // 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. |
| |
| #define EXTERN |
| #include "go.h" |
| #include "y.tab.h" |
| #include <ar.h> |
| |
| #undef getc |
| #undef ungetc |
| #define getc ccgetc |
| #define ungetc ccungetc |
| |
| extern int yychar; |
| int windows; |
| int yyprev; |
| int yylast; |
| |
| static void lexinit(void); |
| static void lexfini(void); |
| static void yytinit(void); |
| static int getc(void); |
| static void ungetc(int); |
| static int32 getr(void); |
| static int escchar(int, int*, vlong*); |
| static void addidir(char*); |
| static int getlinepragma(void); |
| static char *goos, *goarch, *goroot; |
| |
| // Our own isdigit, isspace, isalpha, isalnum that take care |
| // of EOF and other out of range arguments. |
| static int |
| yy_isdigit(int c) |
| { |
| return c >= 0 && c <= 0xFF && isdigit(c); |
| } |
| |
| static int |
| yy_isspace(int c) |
| { |
| return c >= 0 && c <= 0xFF && isspace(c); |
| } |
| |
| static int |
| yy_isalpha(int c) |
| { |
| return c >= 0 && c <= 0xFF && isalpha(c); |
| } |
| |
| static int |
| yy_isalnum(int c) |
| { |
| return c >= 0 && c <= 0xFF && isalnum(c); |
| } |
| |
| // Disallow use of isdigit etc. |
| #undef isdigit |
| #undef isspace |
| #undef isalpha |
| #undef isalnum |
| #define isdigit use_yy_isdigit_instead_of_isdigit |
| #define isspace use_yy_isspace_instead_of_isspace |
| #define isalpha use_yy_isalpha_instead_of_isalpha |
| #define isalnum use_yy_isalnum_instead_of_isalnum |
| |
| #define DBG if(!debug['x']);else print |
| enum |
| { |
| EOF = -1, |
| }; |
| |
| void |
| usage(void) |
| { |
| print("gc: usage: %cg [flags] file.go...\n", thechar); |
| print("flags:\n"); |
| // -A is allow use of "any" type, for bootstrapping |
| print(" -I DIR search for packages in DIR\n"); |
| print(" -d print declarations\n"); |
| print(" -e no limit on number of errors printed\n"); |
| print(" -f print stack frame structure\n"); |
| print(" -h panic on an error\n"); |
| print(" -o file specify output file\n"); |
| print(" -S print the assembly language\n"); |
| print(" -V print the compiler version\n"); |
| print(" -u disable package unsafe\n"); |
| print(" -w print the parse tree after typing\n"); |
| print(" -x print lex tokens\n"); |
| exit(0); |
| } |
| |
| void |
| fault(int s) |
| { |
| // If we've already complained about things |
| // in the program, don't bother complaining |
| // about the seg fault too; let the user clean up |
| // the code and try again. |
| if(nsavederrors + nerrors > 0) |
| errorexit(); |
| fatal("fault"); |
| } |
| |
| int |
| main(int argc, char *argv[]) |
| { |
| int i, c; |
| NodeList *l; |
| char *p; |
| |
| signal(SIGBUS, fault); |
| signal(SIGSEGV, fault); |
| |
| localpkg = mkpkg(strlit("")); |
| localpkg->prefix = "\"\""; |
| |
| builtinpkg = mkpkg(strlit("go.builtin")); |
| |
| gostringpkg = mkpkg(strlit("go.string")); |
| gostringpkg->name = "go.string"; |
| gostringpkg->prefix = "go.string"; // not go%2estring |
| |
| runtimepkg = mkpkg(strlit("runtime")); |
| runtimepkg->name = "runtime"; |
| |
| typepkg = mkpkg(strlit("type")); |
| typepkg->name = "type"; |
| |
| unsafepkg = mkpkg(strlit("unsafe")); |
| unsafepkg->name = "unsafe"; |
| |
| goroot = getgoroot(); |
| goos = getgoos(); |
| goarch = thestring; |
| |
| outfile = nil; |
| ARGBEGIN { |
| default: |
| c = ARGC(); |
| if(c >= 0 && c < sizeof(debug)) |
| debug[c]++; |
| break; |
| |
| case 'o': |
| outfile = EARGF(usage()); |
| break; |
| |
| case 'I': |
| addidir(EARGF(usage())); |
| break; |
| |
| case 'u': |
| safemode = 1; |
| break; |
| |
| case 'V': |
| print("%cg version %s\n", thechar, getgoversion()); |
| exit(0); |
| } ARGEND |
| |
| if(argc < 1) |
| usage(); |
| |
| // special flag to detect compilation of package runtime |
| compiling_runtime = debug['+']; |
| |
| pathname = mal(1000); |
| if(getwd(pathname, 999) == 0) |
| strcpy(pathname, "/???"); |
| |
| if(yy_isalpha(pathname[0]) && pathname[1] == ':') { |
| // On Windows. |
| windows = 1; |
| |
| // Canonicalize path by converting \ to / (Windows accepts both). |
| for(p=pathname; *p; p++) |
| if(*p == '\\') |
| *p = '/'; |
| } |
| |
| fmtinstall('O', Oconv); // node opcodes |
| fmtinstall('E', Econv); // etype opcodes |
| fmtinstall('J', Jconv); // all the node flags |
| fmtinstall('S', Sconv); // sym pointer |
| fmtinstall('T', Tconv); // type pointer |
| fmtinstall('N', Nconv); // node pointer |
| fmtinstall('Z', Zconv); // escaped string |
| fmtinstall('L', Lconv); // line number |
| fmtinstall('B', Bconv); // big numbers |
| fmtinstall('F', Fconv); // big float numbers |
| |
| betypeinit(); |
| if(widthptr == 0) |
| fatal("betypeinit failed"); |
| |
| lexinit(); |
| typeinit(); |
| yytinit(); |
| |
| blockgen = 1; |
| dclcontext = PEXTERN; |
| nerrors = 0; |
| lexlineno = 1; |
| |
| for(i=0; i<argc; i++) { |
| infile = argv[i]; |
| linehist(infile, 0, 0); |
| |
| curio.infile = infile; |
| curio.bin = Bopen(infile, OREAD); |
| if(curio.bin == nil) { |
| print("open %s: %r\n", infile); |
| errorexit(); |
| } |
| curio.peekc = 0; |
| curio.peekc1 = 0; |
| curio.nlsemi = 0; |
| |
| block = 1; |
| |
| yyparse(); |
| if(nsyntaxerrors != 0) |
| errorexit(); |
| |
| linehist(nil, 0, 0); |
| if(curio.bin != nil) |
| Bterm(curio.bin); |
| } |
| testdclstack(); |
| mkpackage(localpkg->name); // final import not used checks |
| lexfini(); |
| |
| typecheckok = 1; |
| if(debug['f']) |
| frame(1); |
| |
| // Process top-level declarations in four phases. |
| // Phase 1: const, type, and names and types of funcs. |
| // This will gather all the information about types |
| // and methods but doesn't depend on any of it. |
| // Phase 2: Variable assignments. |
| // To check interface assignments, depends on phase 1. |
| // Phase 3: Type check function bodies. |
| // Phase 4: Compile function bodies. |
| defercheckwidth(); |
| for(l=xtop; l; l=l->next) |
| if(l->n->op != ODCL && l->n->op != OAS) |
| typecheck(&l->n, Etop); |
| for(l=xtop; l; l=l->next) |
| if(l->n->op == ODCL || l->n->op == OAS) |
| typecheck(&l->n, Etop); |
| resumetypecopy(); |
| resumecheckwidth(); |
| |
| for(l=xtop; l; l=l->next) |
| if(l->n->op == ODCLFUNC) { |
| curfn = l->n; |
| saveerrors(); |
| typechecklist(l->n->nbody, Etop); |
| if(nerrors != 0) |
| l->n->nbody = nil; // type errors; do not compile |
| } |
| curfn = nil; |
| |
| for(l=xtop; l; l=l->next) |
| if(l->n->op == ODCLFUNC) |
| funccompile(l->n, 0); |
| |
| if(nsavederrors+nerrors == 0) |
| fninit(xtop); |
| |
| while(closures) { |
| l = closures; |
| closures = nil; |
| for(; l; l=l->next) |
| funccompile(l->n, 1); |
| } |
| |
| for(l=externdcl; l; l=l->next) |
| if(l->n->op == ONAME) |
| typecheck(&l->n, Erv); |
| |
| if(nerrors+nsavederrors) |
| errorexit(); |
| |
| dumpobj(); |
| |
| if(nerrors+nsavederrors) |
| errorexit(); |
| |
| flusherrors(); |
| exit(0); |
| return 0; |
| } |
| |
| void |
| saveerrors(void) |
| { |
| nsavederrors += nerrors; |
| nerrors = 0; |
| } |
| |
| static int |
| arsize(Biobuf *b, char *name) |
| { |
| struct ar_hdr *a; |
| |
| if((a = Brdline(b, '\n')) == nil) |
| return -1; |
| if(Blinelen(b) != sizeof(struct ar_hdr)) |
| return -1; |
| if(strncmp(a->name, name, strlen(name)) != 0) |
| return -1; |
| return atoi(a->size); |
| } |
| |
| static int |
| skiptopkgdef(Biobuf *b) |
| { |
| char *p; |
| int sz; |
| |
| /* archive header */ |
| if((p = Brdline(b, '\n')) == nil) |
| return 0; |
| if(Blinelen(b) != 8) |
| return 0; |
| if(memcmp(p, "!<arch>\n", 8) != 0) |
| return 0; |
| /* symbol table is first; skip it */ |
| sz = arsize(b, "__.SYMDEF"); |
| if(sz < 0) |
| return 0; |
| Bseek(b, sz, 1); |
| /* package export block is second */ |
| sz = arsize(b, "__.PKGDEF"); |
| if(sz <= 0) |
| return 0; |
| return 1; |
| } |
| |
| static void |
| addidir(char* dir) |
| { |
| Idir** pp; |
| |
| if(dir == nil) |
| return; |
| |
| for(pp = &idirs; *pp != nil; pp = &(*pp)->link) |
| ; |
| *pp = mal(sizeof(Idir)); |
| (*pp)->link = nil; |
| (*pp)->dir = dir; |
| } |
| |
| // is this path a local name? begins with ./ or ../ or / |
| static int |
| islocalname(Strlit *name) |
| { |
| if(!windows && name->len >= 1 && name->s[0] == '/') |
| return 1; |
| if(windows && name->len >= 3 && |
| yy_isalpha(name->s[0]) && name->s[1] == ':' && name->s[2] == '/') |
| return 1; |
| if(name->len >= 2 && strncmp(name->s, "./", 2) == 0) |
| return 1; |
| if(name->len >= 3 && strncmp(name->s, "../", 3) == 0) |
| return 1; |
| return 0; |
| } |
| |
| static int |
| findpkg(Strlit *name) |
| { |
| Idir *p; |
| char *q; |
| |
| if(islocalname(name)) { |
| if(safemode) |
| return 0; |
| // try .a before .6. important for building libraries: |
| // if there is an array.6 in the array.a library, |
| // want to find all of array.a, not just array.6. |
| snprint(namebuf, sizeof(namebuf), "%Z.a", name); |
| if(access(namebuf, 0) >= 0) |
| return 1; |
| snprint(namebuf, sizeof(namebuf), "%Z.%c", name, thechar); |
| if(access(namebuf, 0) >= 0) |
| return 1; |
| return 0; |
| } |
| |
| // local imports should be canonicalized already. |
| // don't want to see "container/../container/vector" |
| // as different from "container/vector". |
| q = mal(name->len+1); |
| memmove(q, name->s, name->len); |
| q[name->len] = '\0'; |
| cleanname(q); |
| if(strlen(q) != name->len || memcmp(q, name->s, name->len) != 0) { |
| yyerror("non-canonical import path %Z (should be %s)", name, q); |
| return 0; |
| } |
| |
| for(p = idirs; p != nil; p = p->link) { |
| snprint(namebuf, sizeof(namebuf), "%s/%Z.a", p->dir, name); |
| if(access(namebuf, 0) >= 0) |
| return 1; |
| snprint(namebuf, sizeof(namebuf), "%s/%Z.%c", p->dir, name, thechar); |
| if(access(namebuf, 0) >= 0) |
| return 1; |
| } |
| if(goroot != nil) { |
| snprint(namebuf, sizeof(namebuf), "%s/pkg/%s_%s/%Z.a", goroot, goos, goarch, name); |
| if(access(namebuf, 0) >= 0) |
| return 1; |
| snprint(namebuf, sizeof(namebuf), "%s/pkg/%s_%s/%Z.%c", goroot, goos, goarch, name, thechar); |
| if(access(namebuf, 0) >= 0) |
| return 1; |
| } |
| return 0; |
| } |
| |
| void |
| importfile(Val *f, int line) |
| { |
| Biobuf *imp; |
| char *file, *p, *q; |
| int32 c; |
| int len; |
| Strlit *path; |
| char *cleanbuf; |
| |
| // TODO(rsc): don't bother reloading imports more than once? |
| |
| if(f->ctype != CTSTR) { |
| yyerror("import statement not a string"); |
| return; |
| } |
| |
| if(strlen(f->u.sval->s) != f->u.sval->len) { |
| yyerror("import path contains NUL"); |
| errorexit(); |
| } |
| |
| // The package name main is no longer reserved, |
| // but we reserve the import path "main" to identify |
| // the main package, just as we reserve the import |
| // path "math" to identify the standard math package. |
| if(strcmp(f->u.sval->s, "main") == 0) { |
| yyerror("cannot import \"main\""); |
| errorexit(); |
| } |
| |
| if(strcmp(f->u.sval->s, "unsafe") == 0) { |
| if(safemode) { |
| yyerror("cannot import package unsafe"); |
| errorexit(); |
| } |
| importpkg = mkpkg(f->u.sval); |
| cannedimports("unsafe.6", unsafeimport); |
| return; |
| } |
| |
| path = f->u.sval; |
| if(islocalname(path)) { |
| cleanbuf = mal(strlen(pathname) + strlen(path->s) + 2); |
| strcpy(cleanbuf, pathname); |
| strcat(cleanbuf, "/"); |
| strcat(cleanbuf, path->s); |
| cleanname(cleanbuf); |
| path = strlit(cleanbuf); |
| } |
| |
| if(!findpkg(path)) { |
| yyerror("can't find import: %Z", f->u.sval); |
| errorexit(); |
| } |
| importpkg = mkpkg(path); |
| |
| imp = Bopen(namebuf, OREAD); |
| if(imp == nil) { |
| yyerror("can't open import: %Z: %r", f->u.sval); |
| errorexit(); |
| } |
| file = strdup(namebuf); |
| |
| len = strlen(namebuf); |
| if(len > 2 && namebuf[len-2] == '.' && namebuf[len-1] == 'a') { |
| if(!skiptopkgdef(imp)) { |
| yyerror("import %s: not a package file", file); |
| errorexit(); |
| } |
| } |
| |
| // check object header |
| p = Brdstr(imp, '\n', 1); |
| if(strcmp(p, "empty archive") != 0) { |
| if(strncmp(p, "go object ", 10) != 0) { |
| yyerror("import %s: not a go object file", file); |
| errorexit(); |
| } |
| q = smprint("%s %s %s", getgoos(), thestring, getgoversion()); |
| if(strcmp(p+10, q) != 0) { |
| yyerror("import %s: object is [%s] expected [%s]", file, p+10, q); |
| errorexit(); |
| } |
| free(q); |
| } |
| |
| // assume files move (get installed) |
| // so don't record the full path. |
| linehist(file + len - path->len - 2, -1, 1); // acts as #pragma lib |
| |
| /* |
| * position the input right |
| * after $$ and return |
| */ |
| pushedio = curio; |
| curio.bin = imp; |
| curio.peekc = 0; |
| curio.peekc1 = 0; |
| curio.infile = file; |
| curio.nlsemi = 0; |
| typecheckok = 1; |
| |
| for(;;) { |
| c = getc(); |
| if(c == EOF) |
| break; |
| if(c != '$') |
| continue; |
| c = getc(); |
| if(c == EOF) |
| break; |
| if(c != '$') |
| continue; |
| return; |
| } |
| yyerror("no import in: %Z", f->u.sval); |
| unimportfile(); |
| } |
| |
| void |
| unimportfile(void) |
| { |
| if(curio.bin != nil) { |
| Bterm(curio.bin); |
| curio.bin = nil; |
| } else |
| lexlineno--; // re correct sys.6 line number |
| |
| curio = pushedio; |
| pushedio.bin = nil; |
| incannedimport = 0; |
| typecheckok = 0; |
| } |
| |
| void |
| cannedimports(char *file, char *cp) |
| { |
| lexlineno++; // if sys.6 is included on line 1, |
| |
| pushedio = curio; |
| curio.bin = nil; |
| curio.peekc = 0; |
| curio.peekc1 = 0; |
| curio.infile = file; |
| curio.cp = cp; |
| curio.nlsemi = 0; |
| curio.importsafe = 0; |
| |
| typecheckok = 1; |
| incannedimport = 1; |
| } |
| |
| static int |
| isfrog(int c) |
| { |
| // complain about possibly invisible control characters |
| if(c < 0) |
| return 1; |
| if(c < ' ') { |
| if(c == '\n' || c== '\r' || c == '\t') // good white space |
| return 0; |
| return 1; |
| } |
| if(0x7f <= c && c <= 0xa0) // DEL, unicode block including unbreakable space. |
| return 1; |
| return 0; |
| } |
| |
| typedef struct Loophack Loophack; |
| struct Loophack { |
| int v; |
| Loophack *next; |
| }; |
| |
| static int32 |
| _yylex(void) |
| { |
| int c, c1, clen, escflag, ncp; |
| vlong v; |
| char *cp, *ep; |
| Rune rune; |
| Sym *s; |
| static Loophack *lstk; |
| Loophack *h; |
| |
| prevlineno = lineno; |
| |
| l0: |
| c = getc(); |
| if(yy_isspace(c)) { |
| if(c == '\n' && curio.nlsemi) { |
| ungetc(c); |
| DBG("lex: implicit semi\n"); |
| return ';'; |
| } |
| goto l0; |
| } |
| |
| lineno = lexlineno; /* start of token */ |
| |
| if(c >= Runeself) { |
| /* all multibyte runes are alpha */ |
| cp = lexbuf; |
| ep = lexbuf+sizeof lexbuf; |
| goto talph; |
| } |
| |
| if(yy_isalpha(c)) { |
| cp = lexbuf; |
| ep = lexbuf+sizeof lexbuf; |
| goto talph; |
| } |
| |
| if(yy_isdigit(c)) |
| goto tnum; |
| |
| switch(c) { |
| case EOF: |
| lineno = prevlineno; |
| ungetc(EOF); |
| return -1; |
| |
| case '_': |
| cp = lexbuf; |
| ep = lexbuf+sizeof lexbuf; |
| goto talph; |
| |
| case '.': |
| c1 = getc(); |
| if(yy_isdigit(c1)) { |
| cp = lexbuf; |
| ep = lexbuf+sizeof lexbuf; |
| *cp++ = c; |
| c = c1; |
| c1 = 0; |
| goto casedot; |
| } |
| if(c1 == '.') { |
| c1 = getc(); |
| if(c1 == '.') { |
| c = LDDD; |
| goto lx; |
| } |
| ungetc(c1); |
| c1 = '.'; |
| } |
| break; |
| |
| case '"': |
| /* "..." */ |
| strcpy(lexbuf, "\"<string>\""); |
| cp = mal(8); |
| clen = sizeof(int32); |
| ncp = 8; |
| |
| for(;;) { |
| if(clen+UTFmax > ncp) { |
| cp = remal(cp, ncp, ncp); |
| ncp += ncp; |
| } |
| if(escchar('"', &escflag, &v)) |
| break; |
| if(v < Runeself || escflag) { |
| cp[clen++] = v; |
| } else { |
| rune = v; |
| c = runelen(rune); |
| runetochar(cp+clen, &rune); |
| clen += c; |
| } |
| } |
| goto strlit; |
| |
| case '`': |
| /* `...` */ |
| strcpy(lexbuf, "`<string>`"); |
| cp = mal(8); |
| clen = sizeof(int32); |
| ncp = 8; |
| |
| for(;;) { |
| if(clen+UTFmax > ncp) { |
| cp = remal(cp, ncp, ncp); |
| ncp += ncp; |
| } |
| c = getr(); |
| if(c == EOF) { |
| yyerror("eof in string"); |
| break; |
| } |
| if(c == '`') |
| break; |
| rune = c; |
| clen += runetochar(cp+clen, &rune); |
| } |
| |
| strlit: |
| *(int32*)cp = clen-sizeof(int32); // length |
| do { |
| cp[clen++] = 0; |
| } while(clen & MAXALIGN); |
| yylval.val.u.sval = (Strlit*)cp; |
| yylval.val.ctype = CTSTR; |
| DBG("lex: string literal\n"); |
| return LLITERAL; |
| |
| case '\'': |
| /* '.' */ |
| if(escchar('\'', &escflag, &v)) { |
| yyerror("empty character literal or unescaped ' in character literal"); |
| v = '\''; |
| } |
| if(!escchar('\'', &escflag, &v)) { |
| yyerror("missing '"); |
| ungetc(v); |
| } |
| yylval.val.u.xval = mal(sizeof(*yylval.val.u.xval)); |
| mpmovecfix(yylval.val.u.xval, v); |
| yylval.val.ctype = CTINT; |
| DBG("lex: codepoint literal\n"); |
| return LLITERAL; |
| |
| case '/': |
| c1 = getc(); |
| if(c1 == '*') { |
| int nl; |
| |
| nl = 0; |
| for(;;) { |
| c = getr(); |
| if(c == '\n') |
| nl = 1; |
| while(c == '*') { |
| c = getr(); |
| if(c == '/') { |
| if(nl) |
| ungetc('\n'); |
| goto l0; |
| } |
| if(c == '\n') |
| nl = 1; |
| } |
| if(c == EOF) { |
| yyerror("eof in comment"); |
| errorexit(); |
| } |
| } |
| } |
| if(c1 == '/') { |
| c = getlinepragma(); |
| for(;;) { |
| if(c == '\n' || c == EOF) { |
| ungetc(c); |
| goto l0; |
| } |
| c = getr(); |
| } |
| } |
| if(c1 == '=') { |
| c = ODIV; |
| goto asop; |
| } |
| break; |
| |
| case ':': |
| c1 = getc(); |
| if(c1 == '=') { |
| c = LCOLAS; |
| goto lx; |
| } |
| break; |
| |
| case '*': |
| c1 = getc(); |
| if(c1 == '=') { |
| c = OMUL; |
| goto asop; |
| } |
| break; |
| |
| case '%': |
| c1 = getc(); |
| if(c1 == '=') { |
| c = OMOD; |
| goto asop; |
| } |
| break; |
| |
| case '+': |
| c1 = getc(); |
| if(c1 == '+') { |
| c = LINC; |
| goto lx; |
| } |
| if(c1 == '=') { |
| c = OADD; |
| goto asop; |
| } |
| break; |
| |
| case '-': |
| c1 = getc(); |
| if(c1 == '-') { |
| c = LDEC; |
| goto lx; |
| } |
| if(c1 == '=') { |
| c = OSUB; |
| goto asop; |
| } |
| break; |
| |
| case '>': |
| c1 = getc(); |
| if(c1 == '>') { |
| c = LRSH; |
| c1 = getc(); |
| if(c1 == '=') { |
| c = ORSH; |
| goto asop; |
| } |
| break; |
| } |
| if(c1 == '=') { |
| c = LGE; |
| goto lx; |
| } |
| c = LGT; |
| break; |
| |
| case '<': |
| c1 = getc(); |
| if(c1 == '<') { |
| c = LLSH; |
| c1 = getc(); |
| if(c1 == '=') { |
| c = OLSH; |
| goto asop; |
| } |
| break; |
| } |
| if(c1 == '=') { |
| c = LLE; |
| goto lx; |
| } |
| if(c1 == '-') { |
| c = LCOMM; |
| goto lx; |
| } |
| c = LLT; |
| break; |
| |
| case '=': |
| c1 = getc(); |
| if(c1 == '=') { |
| c = LEQ; |
| goto lx; |
| } |
| break; |
| |
| case '!': |
| c1 = getc(); |
| if(c1 == '=') { |
| c = LNE; |
| goto lx; |
| } |
| break; |
| |
| case '&': |
| c1 = getc(); |
| if(c1 == '&') { |
| c = LANDAND; |
| goto lx; |
| } |
| if(c1 == '^') { |
| c = LANDNOT; |
| c1 = getc(); |
| if(c1 == '=') { |
| c = OANDNOT; |
| goto asop; |
| } |
| break; |
| } |
| if(c1 == '=') { |
| c = OAND; |
| goto asop; |
| } |
| break; |
| |
| case '|': |
| c1 = getc(); |
| if(c1 == '|') { |
| c = LOROR; |
| goto lx; |
| } |
| if(c1 == '=') { |
| c = OOR; |
| goto asop; |
| } |
| break; |
| |
| case '^': |
| c1 = getc(); |
| if(c1 == '=') { |
| c = OXOR; |
| goto asop; |
| } |
| break; |
| |
| /* |
| * clumsy dance: |
| * to implement rule that disallows |
| * if T{1}[0] { ... } |
| * but allows |
| * if (T{1}[0]) { ... } |
| * the block bodies for if/for/switch/select |
| * begin with an LBODY token, not '{'. |
| * |
| * when we see the keyword, the next |
| * non-parenthesized '{' becomes an LBODY. |
| * loophack is normally 0. |
| * a keyword makes it go up to 1. |
| * parens push loophack onto a stack and go back to 0. |
| * a '{' with loophack == 1 becomes LBODY and disables loophack. |
| * |
| * i said it was clumsy. |
| */ |
| case '(': |
| case '[': |
| if(loophack || lstk != nil) { |
| h = malloc(sizeof *h); |
| h->v = loophack; |
| h->next = lstk; |
| lstk = h; |
| loophack = 0; |
| } |
| goto lx; |
| case ')': |
| case ']': |
| if(lstk != nil) { |
| h = lstk; |
| loophack = h->v; |
| lstk = h->next; |
| free(h); |
| } |
| goto lx; |
| case '{': |
| if(loophack == 1) { |
| DBG("%L lex: LBODY\n", lexlineno); |
| loophack = 0; |
| return LBODY; |
| } |
| goto lx; |
| |
| default: |
| goto lx; |
| } |
| ungetc(c1); |
| |
| lx: |
| if(c > 0xff) |
| DBG("%L lex: TOKEN %s\n", lexlineno, lexname(c)); |
| else |
| DBG("%L lex: TOKEN '%c'\n", lexlineno, c); |
| if(isfrog(c)) { |
| yyerror("illegal character 0x%ux", c); |
| goto l0; |
| } |
| if(importpkg == nil && (c == '#' || c == '$' || c == '?' || c == '@' || c == '\\')) { |
| yyerror("%s: unexpected %c", "syntax error", c); |
| goto l0; |
| } |
| return c; |
| |
| asop: |
| yylval.lint = c; // rathole to hold which asop |
| DBG("lex: TOKEN ASOP %c\n", c); |
| return LASOP; |
| |
| talph: |
| /* |
| * cp is set to lexbuf and some |
| * prefix has been stored |
| */ |
| for(;;) { |
| if(cp+10 >= ep) { |
| yyerror("identifier too long"); |
| errorexit(); |
| } |
| if(c >= Runeself) { |
| ungetc(c); |
| rune = getr(); |
| // 0xb7 · is used for internal names |
| if(!isalpharune(rune) && !isdigitrune(rune) && (importpkg == nil || rune != 0xb7)) |
| yyerror("invalid identifier character 0x%ux", rune); |
| cp += runetochar(cp, &rune); |
| } else if(!yy_isalnum(c) && c != '_') |
| break; |
| else |
| *cp++ = c; |
| c = getc(); |
| } |
| *cp = 0; |
| ungetc(c); |
| |
| s = lookup(lexbuf); |
| switch(s->lexical) { |
| case LIGNORE: |
| goto l0; |
| |
| case LFOR: |
| case LIF: |
| case LSWITCH: |
| case LSELECT: |
| loophack = 1; // see comment about loophack above |
| break; |
| } |
| |
| DBG("lex: %S %s\n", s, lexname(s->lexical)); |
| yylval.sym = s; |
| return s->lexical; |
| |
| tnum: |
| c1 = 0; |
| cp = lexbuf; |
| ep = lexbuf+sizeof lexbuf; |
| if(c != '0') { |
| for(;;) { |
| if(cp+10 >= ep) { |
| yyerror("identifier too long"); |
| errorexit(); |
| } |
| *cp++ = c; |
| c = getc(); |
| if(yy_isdigit(c)) |
| continue; |
| goto dc; |
| } |
| } |
| *cp++ = c; |
| c = getc(); |
| if(c == 'x' || c == 'X') { |
| for(;;) { |
| if(cp+10 >= ep) { |
| yyerror("identifier too long"); |
| errorexit(); |
| } |
| *cp++ = c; |
| c = getc(); |
| if(yy_isdigit(c)) |
| continue; |
| if(c >= 'a' && c <= 'f') |
| continue; |
| if(c >= 'A' && c <= 'F') |
| continue; |
| if(cp == lexbuf+2) |
| yyerror("malformed hex constant"); |
| goto ncu; |
| } |
| } |
| |
| if(c == 'p') // 0p begins floating point zero |
| goto casep; |
| |
| c1 = 0; |
| for(;;) { |
| if(cp+10 >= ep) { |
| yyerror("identifier too long"); |
| errorexit(); |
| } |
| if(!yy_isdigit(c)) |
| break; |
| if(c < '0' || c > '7') |
| c1 = 1; // not octal |
| *cp++ = c; |
| c = getc(); |
| } |
| if(c == '.') |
| goto casedot; |
| if(c == 'e' || c == 'E') |
| goto casee; |
| if(c == 'i') |
| goto casei; |
| if(c1) |
| yyerror("malformed octal constant"); |
| goto ncu; |
| |
| dc: |
| if(c == '.') |
| goto casedot; |
| if(c == 'e' || c == 'E') |
| goto casee; |
| if(c == 'p' || c == 'P') |
| goto casep; |
| if(c == 'i') |
| goto casei; |
| |
| ncu: |
| *cp = 0; |
| ungetc(c); |
| |
| yylval.val.u.xval = mal(sizeof(*yylval.val.u.xval)); |
| mpatofix(yylval.val.u.xval, lexbuf); |
| if(yylval.val.u.xval->ovf) { |
| yyerror("overflow in constant"); |
| mpmovecfix(yylval.val.u.xval, 0); |
| } |
| yylval.val.ctype = CTINT; |
| DBG("lex: integer literal\n"); |
| return LLITERAL; |
| |
| casedot: |
| for(;;) { |
| if(cp+10 >= ep) { |
| yyerror("identifier too long"); |
| errorexit(); |
| } |
| *cp++ = c; |
| c = getc(); |
| if(!yy_isdigit(c)) |
| break; |
| } |
| if(c == 'i') |
| goto casei; |
| if(c != 'e' && c != 'E') |
| goto caseout; |
| |
| casee: |
| *cp++ = 'e'; |
| c = getc(); |
| if(c == '+' || c == '-') { |
| *cp++ = c; |
| c = getc(); |
| } |
| if(!yy_isdigit(c)) |
| yyerror("malformed fp constant exponent"); |
| while(yy_isdigit(c)) { |
| if(cp+10 >= ep) { |
| yyerror("identifier too long"); |
| errorexit(); |
| } |
| *cp++ = c; |
| c = getc(); |
| } |
| if(c == 'i') |
| goto casei; |
| goto caseout; |
| |
| casep: |
| *cp++ = 'p'; |
| c = getc(); |
| if(c == '+' || c == '-') { |
| *cp++ = c; |
| c = getc(); |
| } |
| if(!yy_isdigit(c)) |
| yyerror("malformed fp constant exponent"); |
| while(yy_isdigit(c)) { |
| if(cp+10 >= ep) { |
| yyerror("identifier too long"); |
| errorexit(); |
| } |
| *cp++ = c; |
| c = getc(); |
| } |
| if(c == 'i') |
| goto casei; |
| goto caseout; |
| |
| casei: |
| // imaginary constant |
| *cp = 0; |
| yylval.val.u.cval = mal(sizeof(*yylval.val.u.cval)); |
| mpmovecflt(&yylval.val.u.cval->real, 0.0); |
| mpatoflt(&yylval.val.u.cval->imag, lexbuf); |
| if(yylval.val.u.cval->imag.val.ovf) { |
| yyerror("overflow in imaginary constant"); |
| mpmovecflt(&yylval.val.u.cval->real, 0.0); |
| } |
| yylval.val.ctype = CTCPLX; |
| DBG("lex: imaginary literal\n"); |
| return LLITERAL; |
| |
| caseout: |
| *cp = 0; |
| ungetc(c); |
| |
| yylval.val.u.fval = mal(sizeof(*yylval.val.u.fval)); |
| mpatoflt(yylval.val.u.fval, lexbuf); |
| if(yylval.val.u.fval->val.ovf) { |
| yyerror("overflow in float constant"); |
| mpmovecflt(yylval.val.u.fval, 0.0); |
| } |
| yylval.val.ctype = CTFLT; |
| DBG("lex: floating literal\n"); |
| return LLITERAL; |
| } |
| |
| /* |
| * read and interpret syntax that looks like |
| * //line parse.y:15 |
| * as a discontinuity in sequential line numbers. |
| * the next line of input comes from parse.y:15 |
| */ |
| static int |
| getlinepragma(void) |
| { |
| int i, c, n; |
| char *cp, *ep; |
| Hist *h; |
| |
| for(i=0; i<5; i++) { |
| c = getr(); |
| if(c != "line "[i]) |
| goto out; |
| } |
| |
| cp = lexbuf; |
| ep = lexbuf+sizeof(lexbuf)-5; |
| for(;;) { |
| c = getr(); |
| if(c == '\n' || c == EOF) |
| goto out; |
| if(c == ' ') |
| continue; |
| if(c == ':') |
| break; |
| if(cp < ep) |
| *cp++ = c; |
| } |
| *cp = 0; |
| |
| n = 0; |
| for(;;) { |
| c = getr(); |
| if(!yy_isdigit(c)) |
| break; |
| n = n*10 + (c-'0'); |
| if(n > 1e8) { |
| yyerror("line number out of range"); |
| errorexit(); |
| } |
| } |
| |
| if(c != '\n' || n <= 0) |
| goto out; |
| |
| // try to avoid allocating file name over and over |
| for(h=hist; h!=H; h=h->link) { |
| if(h->name != nil && strcmp(h->name, lexbuf) == 0) { |
| linehist(h->name, n, 0); |
| goto out; |
| } |
| } |
| linehist(strdup(lexbuf), n, 0); |
| |
| out: |
| return c; |
| } |
| |
| int32 |
| yylex(void) |
| { |
| int lx; |
| |
| lx = _yylex(); |
| |
| if(curio.nlsemi && lx == EOF) { |
| // Treat EOF as "end of line" for the purposes |
| // of inserting a semicolon. |
| lx = ';'; |
| } |
| |
| switch(lx) { |
| case LNAME: |
| case LLITERAL: |
| case LBREAK: |
| case LCONTINUE: |
| case LFALL: |
| case LRETURN: |
| case LINC: |
| case LDEC: |
| case ')': |
| case '}': |
| case ']': |
| curio.nlsemi = 1; |
| break; |
| default: |
| curio.nlsemi = 0; |
| break; |
| } |
| |
| // Track last two tokens returned by yylex. |
| yyprev = yylast; |
| yylast = lx; |
| return lx; |
| } |
| |
| static int |
| getc(void) |
| { |
| int c; |
| |
| c = curio.peekc; |
| if(c != 0) { |
| curio.peekc = curio.peekc1; |
| curio.peekc1 = 0; |
| if(c == '\n' && pushedio.bin == nil) |
| lexlineno++; |
| return c; |
| } |
| |
| if(curio.bin == nil) { |
| c = *curio.cp & 0xff; |
| if(c != 0) |
| curio.cp++; |
| } else |
| c = Bgetc(curio.bin); |
| |
| switch(c) { |
| case 0: |
| if(curio.bin != nil) { |
| yyerror("illegal NUL byte"); |
| break; |
| } |
| case EOF: |
| // insert \n at EOF |
| if(curio.eofnl) |
| return EOF; |
| curio.eofnl = 1; |
| c = '\n'; |
| case '\n': |
| if(pushedio.bin == nil) |
| lexlineno++; |
| break; |
| } |
| return c; |
| } |
| |
| static void |
| ungetc(int c) |
| { |
| curio.peekc1 = curio.peekc; |
| curio.peekc = c; |
| if(c == '\n' && pushedio.bin == nil) |
| lexlineno--; |
| } |
| |
| static int32 |
| getr(void) |
| { |
| int c, i; |
| char str[UTFmax+1]; |
| Rune rune; |
| |
| c = getc(); |
| if(c < Runeself) |
| return c; |
| i = 0; |
| str[i++] = c; |
| |
| loop: |
| c = getc(); |
| str[i++] = c; |
| if(!fullrune(str, i)) |
| goto loop; |
| c = chartorune(&rune, str); |
| if(rune == Runeerror && c == 1) { |
| lineno = lexlineno; |
| yyerror("illegal UTF-8 sequence"); |
| flusherrors(); |
| print("\t"); |
| for(c=0; c<i; c++) |
| print("%s%.2x", c > 0 ? " " : "", *(uchar*)(str+c)); |
| print("\n"); |
| } |
| return rune; |
| } |
| |
| static int |
| escchar(int e, int *escflg, vlong *val) |
| { |
| int i, u, c; |
| vlong l; |
| |
| *escflg = 0; |
| |
| c = getr(); |
| switch(c) { |
| case EOF: |
| yyerror("eof in string"); |
| return 1; |
| case '\n': |
| yyerror("newline in string"); |
| return 1; |
| case '\\': |
| break; |
| default: |
| if(c == e) |
| return 1; |
| *val = c; |
| return 0; |
| } |
| |
| u = 0; |
| c = getr(); |
| switch(c) { |
| case 'x': |
| *escflg = 1; // it's a byte |
| i = 2; |
| goto hex; |
| |
| case 'u': |
| i = 4; |
| u = 1; |
| goto hex; |
| |
| case 'U': |
| i = 8; |
| u = 1; |
| goto hex; |
| |
| case '0': |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| case '5': |
| case '6': |
| case '7': |
| *escflg = 1; // it's a byte |
| goto oct; |
| |
| case 'a': c = '\a'; break; |
| case 'b': c = '\b'; break; |
| case 'f': c = '\f'; break; |
| case 'n': c = '\n'; break; |
| case 'r': c = '\r'; break; |
| case 't': c = '\t'; break; |
| case 'v': c = '\v'; break; |
| case '\\': c = '\\'; break; |
| |
| default: |
| if(c != e) |
| yyerror("unknown escape sequence: %c", c); |
| } |
| *val = c; |
| return 0; |
| |
| hex: |
| l = 0; |
| for(; i>0; i--) { |
| c = getc(); |
| if(c >= '0' && c <= '9') { |
| l = l*16 + c-'0'; |
| continue; |
| } |
| if(c >= 'a' && c <= 'f') { |
| l = l*16 + c-'a' + 10; |
| continue; |
| } |
| if(c >= 'A' && c <= 'F') { |
| l = l*16 + c-'A' + 10; |
| continue; |
| } |
| yyerror("non-hex character in escape sequence: %c", c); |
| ungetc(c); |
| break; |
| } |
| if(u && (l > Runemax || (0xd800 <= l && l < 0xe000))) { |
| yyerror("invalid Unicode code point in escape sequence: %#llx", l); |
| l = Runeerror; |
| } |
| *val = l; |
| return 0; |
| |
| oct: |
| l = c - '0'; |
| for(i=2; i>0; i--) { |
| c = getc(); |
| if(c >= '0' && c <= '7') { |
| l = l*8 + c-'0'; |
| continue; |
| } |
| yyerror("non-octal character in escape sequence: %c", c); |
| ungetc(c); |
| } |
| if(l > 255) |
| yyerror("octal escape value > 255: %d", l); |
| |
| *val = l; |
| return 0; |
| } |
| |
| static struct |
| { |
| char* name; |
| int lexical; |
| int etype; |
| int op; |
| } syms[] = |
| { |
| /* name lexical etype op |
| */ |
| /* basic types */ |
| "int8", LNAME, TINT8, OXXX, |
| "int16", LNAME, TINT16, OXXX, |
| "int32", LNAME, TINT32, OXXX, |
| "int64", LNAME, TINT64, OXXX, |
| |
| "uint8", LNAME, TUINT8, OXXX, |
| "uint16", LNAME, TUINT16, OXXX, |
| "uint32", LNAME, TUINT32, OXXX, |
| "uint64", LNAME, TUINT64, OXXX, |
| |
| "float32", LNAME, TFLOAT32, OXXX, |
| "float64", LNAME, TFLOAT64, OXXX, |
| |
| "complex64", LNAME, TCOMPLEX64, OXXX, |
| "complex128", LNAME, TCOMPLEX128, OXXX, |
| |
| "bool", LNAME, TBOOL, OXXX, |
| "byte", LNAME, TUINT8, OXXX, |
| "string", LNAME, TSTRING, OXXX, |
| |
| "any", LNAME, TANY, OXXX, |
| |
| "break", LBREAK, Txxx, OXXX, |
| "case", LCASE, Txxx, OXXX, |
| "chan", LCHAN, Txxx, OXXX, |
| "const", LCONST, Txxx, OXXX, |
| "continue", LCONTINUE, Txxx, OXXX, |
| "default", LDEFAULT, Txxx, OXXX, |
| "else", LELSE, Txxx, OXXX, |
| "defer", LDEFER, Txxx, OXXX, |
| "fallthrough", LFALL, Txxx, OXXX, |
| "for", LFOR, Txxx, OXXX, |
| "func", LFUNC, Txxx, OXXX, |
| "go", LGO, Txxx, OXXX, |
| "goto", LGOTO, Txxx, OXXX, |
| "if", LIF, Txxx, OXXX, |
| "import", LIMPORT, Txxx, OXXX, |
| "interface", LINTERFACE, Txxx, OXXX, |
| "map", LMAP, Txxx, OXXX, |
| "package", LPACKAGE, Txxx, OXXX, |
| "range", LRANGE, Txxx, OXXX, |
| "return", LRETURN, Txxx, OXXX, |
| "select", LSELECT, Txxx, OXXX, |
| "struct", LSTRUCT, Txxx, OXXX, |
| "switch", LSWITCH, Txxx, OXXX, |
| "type", LTYPE, Txxx, OXXX, |
| "var", LVAR, Txxx, OXXX, |
| |
| "append", LNAME, Txxx, OAPPEND, |
| "cap", LNAME, Txxx, OCAP, |
| "close", LNAME, Txxx, OCLOSE, |
| "complex", LNAME, Txxx, OCOMPLEX, |
| "copy", LNAME, Txxx, OCOPY, |
| "imag", LNAME, Txxx, OIMAG, |
| "len", LNAME, Txxx, OLEN, |
| "make", LNAME, Txxx, OMAKE, |
| "new", LNAME, Txxx, ONEW, |
| "panic", LNAME, Txxx, OPANIC, |
| "print", LNAME, Txxx, OPRINT, |
| "println", LNAME, Txxx, OPRINTN, |
| "real", LNAME, Txxx, OREAL, |
| "recover", LNAME, Txxx, ORECOVER, |
| |
| "notwithstanding", LIGNORE, Txxx, OXXX, |
| "thetruthofthematter", LIGNORE, Txxx, OXXX, |
| "despiteallobjections", LIGNORE, Txxx, OXXX, |
| "whereas", LIGNORE, Txxx, OXXX, |
| "insofaras", LIGNORE, Txxx, OXXX, |
| }; |
| |
| static void |
| lexinit(void) |
| { |
| int i, lex; |
| Sym *s, *s1; |
| Type *t; |
| int etype; |
| |
| /* |
| * initialize basic types array |
| * initialize known symbols |
| */ |
| for(i=0; i<nelem(syms); i++) { |
| lex = syms[i].lexical; |
| s = lookup(syms[i].name); |
| s->lexical = lex; |
| |
| etype = syms[i].etype; |
| if(etype != Txxx) { |
| if(etype < 0 || etype >= nelem(types)) |
| fatal("lexinit: %s bad etype", s->name); |
| t = types[etype]; |
| if(t == T) { |
| t = typ(etype); |
| t->sym = s; |
| |
| if(etype != TANY && etype != TSTRING) |
| dowidth(t); |
| types[etype] = t; |
| } |
| s1 = pkglookup(syms[i].name, builtinpkg); |
| s1->lexical = LNAME; |
| s1->def = typenod(t); |
| continue; |
| } |
| } |
| |
| // logically, the type of a string literal. |
| // types[TSTRING] is the named type string |
| // (the type of x in var x string or var x = "hello"). |
| // this is the ideal form |
| // (the type of x in const x = "hello"). |
| idealstring = typ(TSTRING); |
| idealbool = typ(TBOOL); |
| |
| s = pkglookup("true", builtinpkg); |
| s->def = nodbool(1); |
| s->def->sym = lookup("true"); |
| s->def->type = idealbool; |
| |
| s = pkglookup("false", builtinpkg); |
| s->def = nodbool(0); |
| s->def->sym = lookup("false"); |
| s->def->type = idealbool; |
| |
| s = lookup("_"); |
| s->block = -100; |
| s->def = nod(ONAME, N, N); |
| s->def->sym = s; |
| types[TBLANK] = typ(TBLANK); |
| s->def->type = types[TBLANK]; |
| nblank = s->def; |
| } |
| |
| static void |
| lexfini(void) |
| { |
| Sym *s; |
| int lex, etype, i; |
| Val v; |
| |
| for(i=0; i<nelem(syms); i++) { |
| lex = syms[i].lexical; |
| if(lex != LNAME) |
| continue; |
| s = lookup(syms[i].name); |
| s->lexical = lex; |
| |
| etype = syms[i].etype; |
| if(etype != Txxx && (etype != TANY || debug['A']) && s->def == N) |
| s->def = typenod(types[etype]); |
| |
| etype = syms[i].op; |
| if(etype != OXXX && s->def == N) { |
| s->def = nod(ONAME, N, N); |
| s->def->sym = s; |
| s->def->etype = etype; |
| s->def->builtin = 1; |
| } |
| } |
| |
| for(i=0; typedefs[i].name; i++) { |
| s = lookup(typedefs[i].name); |
| if(s->def == N) |
| s->def = typenod(types[typedefs[i].etype]); |
| } |
| |
| // there's only so much table-driven we can handle. |
| // these are special cases. |
| types[TNIL] = typ(TNIL); |
| s = lookup("nil"); |
| if(s->def == N) { |
| v.ctype = CTNIL; |
| s->def = nodlit(v); |
| s->def->sym = s; |
| } |
| |
| s = lookup("iota"); |
| if(s->def == N) { |
| s->def = nod(OIOTA, N, N); |
| s->def->sym = s; |
| } |
| |
| s = lookup("true"); |
| if(s->def == N) { |
| s->def = nodbool(1); |
| s->def->sym = s; |
| } |
| |
| s = lookup("false"); |
| if(s->def == N) { |
| s->def = nodbool(0); |
| s->def->sym = s; |
| } |
| |
| nodfp = nod(ONAME, N, N); |
| nodfp->noescape = 1; |
| nodfp->type = types[TINT32]; |
| nodfp->xoffset = 0; |
| nodfp->class = PPARAM; |
| nodfp->sym = lookup(".fp"); |
| } |
| |
| struct |
| { |
| int lex; |
| char* name; |
| } lexn[] = |
| { |
| LANDAND, "ANDAND", |
| LASOP, "ASOP", |
| LBREAK, "BREAK", |
| LCASE, "CASE", |
| LCHAN, "CHAN", |
| LCOLAS, "COLAS", |
| LCONST, "CONST", |
| LCONTINUE, "CONTINUE", |
| LDEC, "DEC", |
| LDEFER, "DEFER", |
| LELSE, "ELSE", |
| LEQ, "EQ", |
| LFALL, "FALL", |
| LFOR, "FOR", |
| LFUNC, "FUNC", |
| LGE, "GE", |
| LGO, "GO", |
| LGOTO, "GOTO", |
| LGT, "GT", |
| LIF, "IF", |
| LIMPORT, "IMPORT", |
| LINC, "INC", |
| LINTERFACE, "INTERFACE", |
| LLE, "LE", |
| LLITERAL, "LITERAL", |
| LLSH, "LSH", |
| LLT, "LT", |
| LMAP, "MAP", |
| LNAME, "NAME", |
| LNE, "NE", |
| LOROR, "OROR", |
| LPACKAGE, "PACKAGE", |
| LRANGE, "RANGE", |
| LRETURN, "RETURN", |
| LRSH, "RSH", |
| LSTRUCT, "STRUCT", |
| LSWITCH, "SWITCH", |
| LTYPE, "TYPE", |
| LVAR, "VAR", |
| }; |
| |
| char* |
| lexname(int lex) |
| { |
| int i; |
| static char buf[100]; |
| |
| for(i=0; i<nelem(lexn); i++) |
| if(lexn[i].lex == lex) |
| return lexn[i].name; |
| snprint(buf, sizeof(buf), "LEX-%d", lex); |
| return buf; |
| } |
| |
| struct |
| { |
| char *have; |
| char *want; |
| } yytfix[] = |
| { |
| "$end", "EOF", |
| "LLITERAL", "literal", |
| "LASOP", "op=", |
| "LBREAK", "break", |
| "LCASE", "case", |
| "LCOLAS", ":=", |
| "LCONST", "const", |
| "LCONTINUE", "continue", |
| "LDDD", "...", |
| "LDEFAULT", "default", |
| "LDEFER", "defer", |
| "LELSE", "else", |
| "LFALL", "fallthrough", |
| "LFOR", "for", |
| "LFUNC", "func", |
| "LGO", "go", |
| "LGOTO", "goto", |
| "LIF", "if", |
| "LIMPORT", "import", |
| "LINTERFACE", "interface", |
| "LMAP", "map", |
| "LNAME", "name", |
| "LPACKAGE", "package", |
| "LRANGE", "range", |
| "LRETURN", "return", |
| "LSELECT", "select", |
| "LSTRUCT", "struct", |
| "LSWITCH", "switch", |
| "LTYPE", "type", |
| "LVAR", "var", |
| "LANDAND", "&&", |
| "LANDNOT", "&^", |
| "LBODY", "{", |
| "LCOMM", "<-", |
| "LDEC", "--", |
| "LINC", "++", |
| "LEQ", "==", |
| "LGE", ">=", |
| "LGT", ">", |
| "LLE", "<=", |
| "LLT", "<", |
| "LLSH", "<<", |
| "LRSH", ">>", |
| "LOROR", "||", |
| "LNE", "!=", |
| |
| // spell out to avoid confusion with punctuation in error messages |
| "';'", "semicolon or newline", |
| "','", "comma", |
| }; |
| |
| static void |
| yytinit(void) |
| { |
| int i, j; |
| extern char *yytname[]; |
| char *s, *t; |
| |
| for(i=0; yytname[i] != nil; i++) { |
| s = yytname[i]; |
| |
| // apply yytfix if possible |
| for(j=0; j<nelem(yytfix); j++) { |
| if(strcmp(s, yytfix[j].have) == 0) { |
| yytname[i] = yytfix[j].want; |
| goto loop; |
| } |
| } |
| |
| // turn 'x' into x. |
| if(s[0] == '\'') { |
| t = strdup(s+1); |
| t[strlen(t)-1] = '\0'; |
| yytname[i] = t; |
| } |
| loop:; |
| } |
| } |
| |
| void |
| mkpackage(char* pkgname) |
| { |
| Sym *s; |
| int32 h; |
| char *p; |
| |
| if(localpkg->name == nil) { |
| if(strcmp(pkgname, "_") == 0) |
| yyerror("invalid package name _"); |
| localpkg->name = pkgname; |
| } else { |
| if(strcmp(pkgname, localpkg->name) != 0) |
| yyerror("package %s; expected %s", pkgname, localpkg->name); |
| for(h=0; h<NHASH; h++) { |
| for(s = hash[h]; s != S; s = s->link) { |
| if(s->def == N || s->pkg != localpkg) |
| continue; |
| if(s->def->op == OPACK) { |
| // throw away top-level package name leftover |
| // from previous file. |
| // leave s->block set to cause redeclaration |
| // errors if a conflicting top-level name is |
| // introduced by a different file. |
| if(!s->def->used && !nsyntaxerrors) |
| yyerrorl(s->def->lineno, "imported and not used: %Z", s->def->pkg->path); |
| s->def = N; |
| continue; |
| } |
| if(s->def->sym != s) { |
| // throw away top-level name left over |
| // from previous import . "x" |
| if(s->def->pack != N && !s->def->pack->used && !nsyntaxerrors) { |
| yyerrorl(s->def->pack->lineno, "imported and not used: %Z", s->def->pack->pkg->path); |
| s->def->pack->used = 1; |
| } |
| s->def = N; |
| continue; |
| } |
| } |
| } |
| } |
| |
| if(outfile == nil) { |
| p = strrchr(infile, '/'); |
| if(p == nil) |
| p = infile; |
| else |
| p = p+1; |
| snprint(namebuf, sizeof(namebuf), "%s", p); |
| p = strrchr(namebuf, '.'); |
| if(p != nil) |
| *p = 0; |
| outfile = smprint("%s.%c", namebuf, thechar); |
| } |
| } |