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parse.c
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parse.c
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/* Compiler implementation of the D programming language
* Copyright (c) 1999-2014 by Digital Mars
* All Rights Reserved
* written by Walter Bright
* http://www.digitalmars.com
* Distributed under the Boost Software License, Version 1.0.
* http://www.boost.org/LICENSE_1_0.txt
* https://github.com/D-Programming-Language/dmd/blob/master/src/parse.c
*/
// This is the D parser
#include <stdio.h>
#include <assert.h>
#include <string.h> // strlen(),memcpy()
#include "rmem.h"
#include "lexer.h"
#include "parse.h"
#include "init.h"
#include "attrib.h"
#include "cond.h"
#include "mtype.h"
#include "template.h"
#include "staticassert.h"
#include "expression.h"
#include "statement.h"
#include "module.h"
#include "dsymbol.h"
#include "import.h"
#include "declaration.h"
#include "aggregate.h"
#include "enum.h"
#include "id.h"
#include "version.h"
#include "aliasthis.h"
#include "nspace.h"
#include "hdrgen.h"
// How multiple declarations are parsed.
// If 1, treat as C.
// If 0, treat:
// int *p, i;
// as:
// int* p;
// int* i;
#define CDECLSYNTAX 0
// Support C cast syntax:
// (type)(expression)
#define CCASTSYNTAX 1
// Support postfix C array declarations, such as
// int a[3][4];
#define CARRAYDECL 1
Parser::Parser(Module *module, const utf8_t *base, size_t length, int doDocComment)
: Lexer(module, base, 0, length, doDocComment, 0)
{
//printf("Parser::Parser()\n");
md = NULL;
linkage = LINKd;
endloc = Loc();
inBrackets = 0;
lookingForElse = Loc();
//nextToken(); // start up the scanner
}
/*********************
* Use this constructor for string mixins.
* Input:
* loc location in source file of mixin
*/
Parser::Parser(Loc loc, Module *module, const utf8_t *base, size_t length, int doDocComment)
: Lexer(module, base, 0, length, doDocComment, 0)
{
//printf("Parser::Parser()\n");
scanloc = loc;
if (loc.filename)
{
/* Create a pseudo-filename for the mixin string, as it may not even exist
* in the source file.
*/
char *filename = (char *)mem.malloc(strlen(loc.filename) + 7 + sizeof(loc.linnum) * 3 + 1);
sprintf(filename, "%s-mixin-%d", loc.filename, (int)loc.linnum);
scanloc.filename = filename;
}
md = NULL;
linkage = LINKd;
endloc = Loc();
inBrackets = 0;
lookingForElse = Loc();
//nextToken(); // start up the scanner
}
Dsymbols *Parser::parseModule()
{
Dsymbols *decldefs;
bool isdeprecated = false;
Expression *msg = NULL;
Token *tk;
Expressions *udas = NULL;
StorageClass stc;
if (skipAttributes(&token, &tk) && tk->value == TOKmodule)
{
while (token.value != TOKmodule)
{
switch (token.value)
{
case TOKdeprecated:
{
// deprecated (...) module ...
if (isdeprecated)
{
error("there is only one deprecation attribute allowed for module declaration");
}
else
{
isdeprecated = true;
}
nextToken();
if (token.value == TOKlparen)
{
check(TOKlparen);
msg = parseAssignExp();
check(TOKrparen);
}
break;
}
case TOKat:
{
Expressions *exps = NULL;
stc = parseAttribute(&exps);
if (stc == STCproperty || stc == STCnogc || stc == STCdisable ||
stc == STCsafe || stc == STCtrusted || stc == STCsystem)
{
error("@%s attribute for module declaration is not supported", token.toChars());
}
else
{
udas = UserAttributeDeclaration::concat(udas, exps);
}
if (stc)
nextToken();
break;
}
default:
{
error("'module' expected instead of %s", token.toChars());
nextToken();
break;
}
}
}
}
if (udas)
{
Dsymbols *a = new Dsymbols();
UserAttributeDeclaration *udad = new UserAttributeDeclaration(udas, a);
mod->userAttribDecl = udad;
}
// ModuleDeclation leads off
if (token.value == TOKmodule)
{
Loc loc = token.loc;
const utf8_t *comment = token.blockComment;
bool safe = false;
nextToken();
#if 0
if (token.value == TOKlparen)
{
nextToken();
if (token.value != TOKidentifier)
{
error("module (system) identifier expected");
goto Lerr;
}
Identifier *id = token.ident;
if (id == Id::system)
safe = true;
else
error("(safe) expected, not %s", id->toChars());
nextToken();
check(TOKrparen);
}
#endif
if (token.value != TOKidentifier)
{
error("Identifier expected following module");
goto Lerr;
}
else
{
Identifiers *a = NULL;
Identifier *id;
id = token.ident;
while (nextToken() == TOKdot)
{
if (!a)
a = new Identifiers();
a->push(id);
nextToken();
if (token.value != TOKidentifier)
{
error("Identifier expected following package");
goto Lerr;
}
id = token.ident;
}
md = new ModuleDeclaration(loc, a, id, safe);
md->isdeprecated = isdeprecated;
md->msg = msg;
if (token.value != TOKsemicolon)
error("';' expected following module declaration instead of %s", token.toChars());
nextToken();
addComment(mod, comment);
}
}
decldefs = parseDeclDefs(0);
if (token.value != TOKeof)
{
error(token.loc, "unrecognized declaration");
goto Lerr;
}
return decldefs;
Lerr:
while (token.value != TOKsemicolon && token.value != TOKeof)
nextToken();
nextToken();
return new Dsymbols();
}
struct PrefixAttributes
{
StorageClass storageClass;
Expression *depmsg;
LINK link;
Prot protection;
unsigned alignment;
Expressions *udas;
const utf8_t *comment;
PrefixAttributes()
: storageClass(STCundefined),
depmsg(NULL),
link(LINKdefault),
protection(PROTundefined),
alignment(0),
udas(NULL),
comment(NULL)
{
}
};
Dsymbols *Parser::parseDeclDefs(int once, Dsymbol **pLastDecl, PrefixAttributes *pAttrs)
{
Dsymbol *lastDecl = NULL; // used to link unittest to its previous declaration
if (!pLastDecl)
pLastDecl = &lastDecl;
LINK linksave = linkage; // save global state
//printf("Parser::parseDeclDefs()\n");
Dsymbols *decldefs = new Dsymbols();
do
{
// parse result
Dsymbol *s = NULL;
Dsymbols *a = NULL;
PrefixAttributes attrs;
if (!once || !pAttrs)
{
pAttrs = &attrs;
pAttrs->comment = token.blockComment;
}
PROTKIND prot;
StorageClass stc;
Condition *condition;
linkage = linksave;
switch (token.value)
{
case TOKenum:
{
/* Determine if this is a manifest constant declaration,
* or a conventional enum.
*/
Token *t = peek(&token);
if (t->value == TOKlcurly || t->value == TOKcolon)
s = parseEnum();
else if (t->value != TOKidentifier)
goto Ldeclaration;
else
{
t = peek(t);
if (t->value == TOKlcurly || t->value == TOKcolon ||
t->value == TOKsemicolon)
s = parseEnum();
else
goto Ldeclaration;
}
break;
}
case TOKimport:
a = parseImport();
// keep pLastDecl
break;
case TOKtemplate:
s = (Dsymbol *)parseTemplateDeclaration();
break;
case TOKmixin:
{
Loc loc = token.loc;
switch (peekNext())
{
case TOKlparen:
{
// mixin(string)
nextToken();
check(TOKlparen, "mixin");
Expression *e = parseAssignExp();
check(TOKrparen);
check(TOKsemicolon);
s = new CompileDeclaration(loc, e);
break;
}
case TOKtemplate:
// mixin template
nextToken();
s = (Dsymbol *)parseTemplateDeclaration(true);
break;
default:
s = parseMixin();
break;
}
break;
}
case TOKwchar: case TOKdchar:
case TOKbool: case TOKchar:
case TOKint8: case TOKuns8:
case TOKint16: case TOKuns16:
case TOKint32: case TOKuns32:
case TOKint64: case TOKuns64:
case TOKint128: case TOKuns128:
case TOKfloat32: case TOKfloat64: case TOKfloat80:
case TOKimaginary32: case TOKimaginary64: case TOKimaginary80:
case TOKcomplex32: case TOKcomplex64: case TOKcomplex80:
case TOKvoid:
case TOKalias:
case TOKtypedef:
case TOKidentifier:
case TOKsuper:
case TOKtypeof:
case TOKdot:
case TOKvector:
case TOKstruct:
case TOKunion:
case TOKclass:
case TOKinterface:
Ldeclaration:
a = parseDeclarations(false, pAttrs, pAttrs->comment);
if (a && a->dim)
*pLastDecl = (*a)[a->dim-1];
break;
case TOKthis:
if (peekNext() == TOKdot)
goto Ldeclaration;
else
s = parseCtor(pAttrs);
break;
case TOKtilde:
s = parseDtor(pAttrs);
break;
case TOKinvariant:
{
Token *t = peek(&token);
if (t->value == TOKlparen && peek(t)->value == TOKrparen ||
t->value == TOKlcurly)
{
// invariant {}
// invariant() {}
s = parseInvariant(pAttrs);
}
else
{
error("invariant body expected, not '%s'", token.toChars());
goto Lerror;
}
break;
}
case TOKunittest:
s = parseUnitTest(pAttrs);
if (*pLastDecl)
(*pLastDecl)->ddocUnittest = (UnitTestDeclaration *)s;
break;
case TOKnew:
s = parseNew(pAttrs);
break;
case TOKdelete:
s = parseDelete(pAttrs);
break;
case TOKcolon:
case TOKlcurly:
error("Declaration expected, not '%s'",token.toChars());
goto Lerror;
case TOKrcurly:
case TOKeof:
if (once)
error("Declaration expected, not '%s'", token.toChars());
return decldefs;
case TOKstatic:
{
TOK next = peekNext();
if (next == TOKthis)
s = parseStaticCtor(pAttrs);
else if (next == TOKtilde)
s = parseStaticDtor(pAttrs);
else if (next == TOKassert)
s = parseStaticAssert();
else if (next == TOKif)
{
condition = parseStaticIfCondition();
Dsymbols *athen;
if (token.value == TOKcolon)
athen = parseBlock(pLastDecl);
else
{
Loc lookingForElseSave = lookingForElse;
lookingForElse = token.loc;
athen = parseBlock(pLastDecl);
lookingForElse = lookingForElseSave;
}
Dsymbols *aelse = NULL;
if (token.value == TOKelse)
{
Loc elseloc = token.loc;
nextToken();
aelse = parseBlock(pLastDecl);
checkDanglingElse(elseloc);
}
s = new StaticIfDeclaration(condition, athen, aelse);
}
else if (next == TOKimport)
{
a = parseImport();
// keep pLastDecl
}
else
{
stc = STCstatic;
goto Lstc;
}
break;
}
case TOKconst:
if (peekNext() == TOKlparen)
goto Ldeclaration;
stc = STCconst;
goto Lstc;
case TOKimmutable:
if (peekNext() == TOKlparen)
goto Ldeclaration;
stc = STCimmutable;
goto Lstc;
case TOKshared:
{
TOK next = peekNext();
if (next == TOKlparen)
goto Ldeclaration;
if (next == TOKstatic)
{
TOK next2 = peekNext2();
if (next2 == TOKthis)
{
s = parseSharedStaticCtor(pAttrs);
break;
}
if (next2 == TOKtilde)
{
s = parseSharedStaticDtor(pAttrs);
break;
}
}
stc = STCshared;
goto Lstc;
}
case TOKwild:
if (peekNext() == TOKlparen)
goto Ldeclaration;
stc = STCwild;
goto Lstc;
case TOKfinal: stc = STCfinal; goto Lstc;
case TOKauto: stc = STCauto; goto Lstc;
case TOKscope: stc = STCscope; goto Lstc;
case TOKoverride: stc = STCoverride; goto Lstc;
case TOKabstract: stc = STCabstract; goto Lstc;
case TOKsynchronized: stc = STCsynchronized; goto Lstc;
case TOKnothrow: stc = STCnothrow; goto Lstc;
case TOKpure: stc = STCpure; goto Lstc;
case TOKref: stc = STCref; goto Lstc;
case TOKgshared: stc = STCgshared; goto Lstc;
//case TOKmanifest: stc = STCmanifest; goto Lstc;
case TOKat:
{
Expressions *exps = NULL;
stc = parseAttribute(&exps);
if (stc)
goto Lstc; // it's a predefined attribute
// no redundant/conflicting check for UDAs
pAttrs->udas = UserAttributeDeclaration::concat(pAttrs->udas, exps);
goto Lautodecl;
}
Lstc:
pAttrs->storageClass = appendStorageClass(pAttrs->storageClass, stc);
nextToken();
Lautodecl:
Token *tk;
/* Look for auto initializers:
* storage_class identifier = initializer;
* storage_class identifier(...) = initializer;
*/
if (token.value == TOKidentifier &&
skipParensIf(peek(&token), &tk) &&
tk->value == TOKassign)
{
a = parseAutoDeclarations(pAttrs->storageClass, pAttrs->comment);
pAttrs->storageClass = STCundefined;
if (a && a->dim)
*pLastDecl = (*a)[a->dim-1];
if (pAttrs->udas)
{
s = new UserAttributeDeclaration(pAttrs->udas, a);
pAttrs->udas = NULL;
}
break;
}
/* Look for return type inference for template functions.
*/
if (token.value == TOKidentifier &&
skipParens(peek(&token), &tk) &&
skipAttributes(tk, &tk) &&
(tk->value == TOKlparen ||
tk->value == TOKlcurly ||
tk->value == TOKin ||
tk->value == TOKout ||
tk->value == TOKbody)
)
{
a = parseDeclarations(true, pAttrs, pAttrs->comment);
if (a && a->dim)
*pLastDecl = (*a)[a->dim-1];
if (pAttrs->udas)
{
s = new UserAttributeDeclaration(pAttrs->udas, a);
pAttrs->udas = NULL;
}
break;
}
a = parseBlock(pLastDecl, pAttrs);
if (pAttrs->storageClass != STCundefined)
{
s = new StorageClassDeclaration(pAttrs->storageClass, a);
pAttrs->storageClass = STCundefined;
}
if (pAttrs->udas)
{
if (s)
a = new Dsymbols(), a->push(s);
s = new UserAttributeDeclaration(pAttrs->udas, a);
pAttrs->udas = NULL;
}
break;
case TOKdeprecated:
{
if (peek(&token)->value != TOKlparen)
{
stc = STCdeprecated;
goto Lstc;
}
nextToken();
check(TOKlparen);
Expression *e = parseAssignExp();
check(TOKrparen);
if (pAttrs->depmsg)
{
error("conflicting storage class 'deprecated(%s)' and 'deprecated(%s)'",
pAttrs->depmsg->toChars(), e->toChars());
}
pAttrs->depmsg = e;
a = parseBlock(pLastDecl, pAttrs);
if (pAttrs->depmsg)
{
s = new DeprecatedDeclaration(pAttrs->depmsg, a);
pAttrs->depmsg = NULL;
}
break;
}
case TOKlbracket:
{
if (peekNext() == TOKrbracket)
error("empty attribute list is not allowed");
deprecation("use @(attributes) instead of [attributes]");
Expressions *exps = parseArguments();
// no redundant/conflicting check for UDAs
pAttrs->udas = UserAttributeDeclaration::concat(pAttrs->udas, exps);
a = parseBlock(pLastDecl, pAttrs);
if (pAttrs->udas)
{
s = new UserAttributeDeclaration(pAttrs->udas, a);
pAttrs->udas = NULL;
}
break;
}
case TOKextern:
{
if (peek(&token)->value != TOKlparen)
{
stc = STCextern;
goto Lstc;
}
Loc linkLoc = token.loc;
Identifiers *idents = NULL;
LINK link = parseLinkage(&idents);
if (pAttrs->link != LINKdefault)
{
if (pAttrs->link != link)
{
error("conflicting linkage extern (%s) and extern (%s)",
linkageToChars(pAttrs->link), linkageToChars(link));
}
else if (idents)
{
// Allow:
// extern(C++, foo) extern(C++, bar) void foo();
// to be equivalent with:
// extern(C++, foo.bar) void foo();
}
else
error("redundant linkage extern (%s)", linkageToChars(pAttrs->link));
}
pAttrs->link = link;
this->linkage = link;
a = parseBlock(pLastDecl, pAttrs);
if (idents)
{
assert(link == LINKcpp);
assert(idents->dim);
for (size_t i = idents->dim; i;)
{
Identifier *id = (*idents)[--i];
if (s)
a = new Dsymbols(), a->push(s);
s = new Nspace(linkLoc, id, a);
}
delete idents;
pAttrs->link = LINKdefault;
}
else if (pAttrs->link != LINKdefault)
{
s = new LinkDeclaration(pAttrs->link, a);
pAttrs->link = LINKdefault;
}
break;
}
case TOKprivate: prot = PROTprivate; goto Lprot;
case TOKpackage: prot = PROTpackage; goto Lprot;
case TOKprotected: prot = PROTprotected; goto Lprot;
case TOKpublic: prot = PROTpublic; goto Lprot;
case TOKexport: prot = PROTexport; goto Lprot;
Lprot:
{
if (pAttrs->protection.kind != PROTundefined)
{
if (pAttrs->protection.kind != prot)
error("conflicting protection attribute '%s' and '%s'",
protectionToChars(pAttrs->protection.kind), protectionToChars(prot));
else
error("redundant protection attribute '%s'", protectionToChars(prot));
}
pAttrs->protection.kind = prot;
nextToken();
// optional qualified package identifier to bind
// protection to
Identifiers *pkg_prot_idents = NULL;
if (pAttrs->protection.kind == PROTpackage && token.value == TOKlparen)
{
pkg_prot_idents = parseQualifiedIdentifier("protection package");
if (pkg_prot_idents)
check(TOKrparen);
else
{
while (token.value != TOKsemicolon && token.value != TOKeof)
nextToken();
nextToken();
break;
}
}
Loc attrloc = token.loc;
a = parseBlock(pLastDecl, pAttrs);
if (pAttrs->protection.kind != PROTundefined)
{
if (pAttrs->protection.kind == PROTpackage && pkg_prot_idents)
s = new ProtDeclaration(attrloc, pkg_prot_idents, a);
else
s = new ProtDeclaration(attrloc, pAttrs->protection, a);
pAttrs->protection = Prot(PROTundefined);
}
break;
}
case TOKalign:
{
nextToken();
unsigned n;
if (token.value == TOKlparen)
{
nextToken();
if (token.value == TOKint32v && token.uns64value > 0)
{
if (token.uns64value & (token.uns64value - 1))
error("align(%s) must be a power of 2", token.toChars());
n = (unsigned)token.uns64value;
}
else
{
error("positive integer expected, not %s", token.toChars());
n = 1;
}
nextToken();
check(TOKrparen);
}
else
n = STRUCTALIGN_DEFAULT; // default
if (pAttrs->alignment != 0)
{
const char *s1 = "";
OutBuffer buf1;
if (n != STRUCTALIGN_DEFAULT)
{
buf1.printf("(%d)", n);
s1 = buf1.peekString();
}
if (pAttrs->alignment != n)
{
OutBuffer buf2;
const char *s2 = "";
if (pAttrs->alignment != STRUCTALIGN_DEFAULT)
{
buf2.printf("(%d)", pAttrs->alignment);
s2 = buf2.peekString();
}
error("conflicting alignment attribute align%s and align%s", s2, s1);
}
else
error("redundant alignment attribute align%s", s1);
}
pAttrs->alignment = n;
a = parseBlock(pLastDecl, pAttrs);
if (pAttrs->alignment != 0)
{
s = new AlignDeclaration(pAttrs->alignment, a);
pAttrs->alignment = 0;
}
break;
}
case TOKpragma:
{
Expressions *args = NULL;
Loc loc = token.loc;
nextToken();
check(TOKlparen);
if (token.value != TOKidentifier)
{
error("pragma(identifier) expected");
goto Lerror;
}
Identifier *ident = token.ident;
nextToken();
if (token.value == TOKcomma && peekNext() != TOKrparen)
args = parseArguments(); // pragma(identifier, args...)
else
check(TOKrparen); // pragma(identifier)
Dsymbols *a2 = NULL;
if (token.value != TOKsemicolon)
a2 = parseBlock(pLastDecl);
s = new PragmaDeclaration(loc, ident, args, a2);
break;
}
case TOKdebug:
nextToken();
if (token.value == TOKassign)
{
nextToken();
if (token.value == TOKidentifier)
s = new DebugSymbol(token.loc, token.ident);
else if (token.value == TOKint32v || token.value == TOKint64v)
s = new DebugSymbol(token.loc, (unsigned)token.uns64value);
else
{
error("identifier or integer expected, not %s", token.toChars());
s = NULL;
}
nextToken();
if (token.value != TOKsemicolon)
error("semicolon expected");
nextToken();
break;
}
condition = parseDebugCondition();
goto Lcondition;
case TOKversion:
nextToken();
if (token.value == TOKassign)
{
nextToken();
if (token.value == TOKidentifier)
s = new VersionSymbol(token.loc, token.ident);
else if (token.value == TOKint32v || token.value == TOKint64v)
s = new VersionSymbol(token.loc, (unsigned)token.uns64value);
else
{
error("identifier or integer expected, not %s", token.toChars());
s = NULL;
}
nextToken();
if (token.value != TOKsemicolon)
error("semicolon expected");
nextToken();
break;
}
condition = parseVersionCondition();
goto Lcondition;
Lcondition:
{
Dsymbols *athen;
if (token.value == TOKcolon)
athen = parseBlock(pLastDecl);
else
{
Loc lookingForElseSave = lookingForElse;
lookingForElse = token.loc;
athen = parseBlock(pLastDecl);
lookingForElse = lookingForElseSave;
}
Dsymbols *aelse = NULL;
if (token.value == TOKelse)
{
Loc elseloc = token.loc;
nextToken();
aelse = parseBlock(pLastDecl);
checkDanglingElse(elseloc);
}
s = new ConditionalDeclaration(condition, athen, aelse);
break;
}
case TOKsemicolon: // empty declaration
//error("empty declaration");
nextToken();
continue;
default:
error("Declaration expected, not '%s'",token.toChars());
Lerror:
while (token.value != TOKsemicolon && token.value != TOKeof)
nextToken();
nextToken();
s = NULL;
continue;
}
if (s)
{
if (!s->isAttribDeclaration())
*pLastDecl = s;
decldefs->push(s);
addComment(s, pAttrs->comment);
}
else if (a && a->dim)
{
decldefs->append(a);
}
} while (!once);
linkage = linksave;
return decldefs;
}
/*********************************************
* Give error on redundant/conflicting storage class.
*/
StorageClass Parser::appendStorageClass(StorageClass storageClass, StorageClass stc)
{
if ((storageClass & stc) ||
(storageClass & STCin && stc & (STCconst | STCscope)) ||
(stc & STCin && storageClass & (STCconst | STCscope)))
{
OutBuffer buf;
StorageClassDeclaration::stcToCBuffer(&buf, stc);
if (buf.data[buf.offset - 1] == ' ')
buf.data[buf.offset - 1] = '\0';
error("redundant attribute '%s'", buf.peekString());
return storageClass | stc;
}
storageClass |= stc;
if (stc & (STCconst | STCimmutable | STCmanifest))
{
StorageClass u = storageClass & (STCconst | STCimmutable | STCmanifest);
if (u & (u - 1))
error("conflicting attribute '%s'", Token::toChars(token.value));
}
if (stc & (STCgshared | STCshared | STCtls))
{
StorageClass u = storageClass & (STCgshared | STCshared | STCtls);
if (u & (u - 1))
error("conflicting attribute '%s'", Token::toChars(token.value));
}
if (stc & (STCsafe | STCsystem | STCtrusted))
{
StorageClass u = storageClass & (STCsafe | STCsystem | STCtrusted);
if (u & (u - 1))
error("conflicting attribute '@%s'", token.toChars());
}
return storageClass;
}
/***********************************************
* Parse attribute, lexer is on '@'.
* Input:
* pudas array of UDAs to append to
* Returns:
* storage class if a predefined attribute; also scanner remains on identifier.
* 0 if not a predefined attribute
* *pudas set if user defined attribute, scanner is past UDA