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statementsem.d
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statementsem.d
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/**
* Does semantic analysis for statements.
*
* Specification: $(LINK2 https://dlang.org/spec/statement.html, Statements)
*
* Copyright: Copyright (C) 1999-2022 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 https://www.digitalmars.com, Walter Bright)
* License: $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/statementsem.d, _statementsem.d)
* Documentation: https://dlang.org/phobos/dmd_statementsem.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/statementsem.d
*/
module dmd.statementsem;
import core.stdc.stdio;
import dmd.aggregate;
import dmd.aliasthis;
import dmd.arrayop;
import dmd.arraytypes;
import dmd.astcodegen;
import dmd.astenums;
import dmd.ast_node;
import dmd.attrib;
import dmd.blockexit;
import dmd.clone;
import dmd.cond;
import dmd.ctorflow;
import dmd.dcast;
import dmd.dclass;
import dmd.declaration;
import dmd.denum;
import dmd.dimport;
import dmd.dinterpret;
import dmd.dmodule;
import dmd.dscope;
import dmd.dsymbol;
import dmd.dsymbolsem;
import dmd.dtemplate;
import dmd.errors;
import dmd.escape;
import dmd.expression;
import dmd.expressionsem;
import dmd.func;
import dmd.globals;
import dmd.gluelayer;
import dmd.id;
import dmd.identifier;
import dmd.init;
import dmd.intrange;
import dmd.mtype;
import dmd.nogc;
import dmd.opover;
import dmd.parse;
import dmd.printast;
import dmd.common.outbuffer;
import dmd.root.string;
import dmd.semantic2;
import dmd.sideeffect;
import dmd.statement;
import dmd.staticassert;
import dmd.target;
import dmd.tokens;
import dmd.typesem;
import dmd.visitor;
import dmd.compiler;
version (DMDLIB)
{
version = CallbackAPI;
}
/*****************************************
* CTFE requires FuncDeclaration::labtab for the interpretation.
* So fixing the label name inside in/out contracts is necessary
* for the uniqueness in labtab.
* Params:
* sc = context
* ident = statement label name to be adjusted
* Returns:
* adjusted label name
*/
private Identifier fixupLabelName(Scope* sc, Identifier ident)
{
uint flags = (sc.flags & SCOPE.contract);
const id = ident.toString();
if (flags && flags != SCOPE.invariant_ &&
!(id.length >= 2 && id[0] == '_' && id[1] == '_')) // does not start with "__"
{
OutBuffer buf;
buf.writestring(flags == SCOPE.require ? "__in_" : "__out_");
buf.writestring(ident.toString());
ident = Identifier.idPool(buf[]);
}
return ident;
}
/*******************************************
* Check to see if statement is the innermost labeled statement.
* Params:
* sc = context
* statement = Statement to check
* Returns:
* if `true`, then the `LabelStatement`, otherwise `null`
*/
private LabelStatement checkLabeledLoop(Scope* sc, Statement statement)
{
if (sc.slabel && sc.slabel.statement == statement)
{
return sc.slabel;
}
return null;
}
/***********************************************************
* Check an assignment is used as a condition.
* Intended to be use before the `semantic` call on `e`.
* Params:
* e = condition expression which is not yet run semantic analysis.
* Returns:
* `e` or ErrorExp.
*/
private Expression checkAssignmentAsCondition(Expression e, Scope* sc)
{
if (sc.flags & SCOPE.Cfile)
return e;
auto ec = lastComma(e);
if (ec.op == EXP.assign)
{
ec.error("assignment cannot be used as a condition, perhaps `==` was meant?");
return ErrorExp.get();
}
return e;
}
// Performs semantic analysis in Statement AST nodes
extern(C++) Statement statementSemantic(Statement s, Scope* sc)
{
version (CallbackAPI)
Compiler.onStatementSemanticStart(s, sc);
scope v = new StatementSemanticVisitor(sc);
s.accept(v);
version (CallbackAPI)
Compiler.onStatementSemanticDone(s, sc);
return v.result;
}
package (dmd) extern (C++) final class StatementSemanticVisitor : Visitor
{
alias visit = Visitor.visit;
Statement result;
Scope* sc;
this(Scope* sc)
{
this.sc = sc;
}
private void setError()
{
result = new ErrorStatement();
}
override void visit(Statement s)
{
result = s;
}
override void visit(ErrorStatement s)
{
result = s;
}
override void visit(PeelStatement s)
{
/* "peel" off this wrapper, and don't run semantic()
* on the result.
*/
result = s.s;
}
override void visit(ExpStatement s)
{
/* https://dlang.org/spec/statement.html#expression-statement
*/
if (!s.exp)
{
result = s;
return;
}
//printf("ExpStatement::semantic() %s\n", exp.toChars());
// Allow CommaExp in ExpStatement because return isn't used
CommaExp.allow(s.exp);
s.exp = s.exp.expressionSemantic(sc);
s.exp = resolveProperties(sc, s.exp);
s.exp = s.exp.addDtorHook(sc);
if (checkNonAssignmentArrayOp(s.exp))
s.exp = ErrorExp.get();
if (auto f = isFuncAddress(s.exp))
{
if (f.checkForwardRef(s.exp.loc))
s.exp = ErrorExp.get();
}
if (discardValue(s.exp))
s.exp = ErrorExp.get();
s.exp = s.exp.optimize(WANTvalue);
s.exp = checkGC(sc, s.exp);
if (s.exp.op == EXP.error)
return setError();
result = s;
}
override void visit(CompileStatement cs)
{
/* https://dlang.org/spec/statement.html#mixin-statement
*/
//printf("CompileStatement::semantic() %s\n", exp.toChars());
Statements* a = cs.flatten(sc);
if (!a)
return;
Statement s = new CompoundStatement(cs.loc, a);
result = s.statementSemantic(sc);
}
override void visit(CompoundStatement cs)
{
//printf("CompoundStatement::semantic(this = %p, sc = %p)\n", cs, sc);
version (none)
{
foreach (i, s; cs.statements)
{
if (s)
printf("[%d]: %s", i, s.toChars());
}
}
for (size_t i = 0; i < cs.statements.dim;)
{
Statement s = (*cs.statements)[i];
if (!s)
{
++i;
continue;
}
Statements* flt = s.flatten(sc);
if (flt)
{
cs.statements.remove(i);
cs.statements.insert(i, flt);
continue;
}
s = s.statementSemantic(sc);
(*cs.statements)[i] = s;
if (!s)
{
/* Remove NULL statements from the list.
*/
cs.statements.remove(i);
continue;
}
if (s.isErrorStatement())
{
result = s; // propagate error up the AST
++i;
continue; // look for errors in rest of statements
}
Statement sentry;
Statement sexception;
Statement sfinally;
(*cs.statements)[i] = s.scopeCode(sc, sentry, sexception, sfinally);
if (sentry)
{
sentry = sentry.statementSemantic(sc);
cs.statements.insert(i, sentry);
i++;
}
if (sexception)
sexception = sexception.statementSemantic(sc);
if (sexception)
{
/* Returns: true if statements[] are empty statements
*/
static bool isEmpty(const Statement[] statements)
{
foreach (s; statements)
{
if (const cs = s.isCompoundStatement())
{
if (!isEmpty((*cs.statements)[]))
return false;
}
else
return false;
}
return true;
}
if (!sfinally && isEmpty((*cs.statements)[i + 1 .. cs.statements.dim]))
{
}
else
{
/* Rewrite:
* s; s1; s2;
* As:
* s;
* try { s1; s2; }
* catch (Throwable __o)
* { sexception; throw __o; }
*/
auto a = new Statements();
a.pushSlice((*cs.statements)[i + 1 .. cs.statements.length]);
cs.statements.setDim(i + 1);
Statement _body = new CompoundStatement(Loc.initial, a);
_body = new ScopeStatement(Loc.initial, _body, Loc.initial);
Identifier id = Identifier.generateId("__o");
Statement handler = new PeelStatement(sexception);
if (sexception.blockExit(sc.func, false) & BE.fallthru)
{
auto ts = new ThrowStatement(Loc.initial, new IdentifierExp(Loc.initial, id));
ts.internalThrow = true;
handler = new CompoundStatement(Loc.initial, handler, ts);
}
auto catches = new Catches();
auto ctch = new Catch(Loc.initial, getThrowable(), id, handler);
ctch.internalCatch = true;
catches.push(ctch);
Statement st = new TryCatchStatement(Loc.initial, _body, catches);
if (sfinally)
st = new TryFinallyStatement(Loc.initial, st, sfinally);
st = st.statementSemantic(sc);
cs.statements.push(st);
break;
}
}
else if (sfinally)
{
if (0 && i + 1 == cs.statements.dim)
{
cs.statements.push(sfinally);
}
else
{
/* Rewrite:
* s; s1; s2;
* As:
* s; try { s1; s2; } finally { sfinally; }
*/
auto a = new Statements();
a.pushSlice((*cs.statements)[i + 1 .. cs.statements.length]);
cs.statements.setDim(i + 1);
auto _body = new CompoundStatement(Loc.initial, a);
Statement stf = new TryFinallyStatement(Loc.initial, _body, sfinally);
stf = stf.statementSemantic(sc);
cs.statements.push(stf);
break;
}
}
i++;
}
/* Flatten them in place
*/
void flatten(Statements* statements)
{
for (size_t i = 0; i < statements.length;)
{
Statement s = (*statements)[i];
if (s)
{
if (auto flt = s.flatten(sc))
{
statements.remove(i);
statements.insert(i, flt);
continue;
}
}
++i;
}
}
/* https://issues.dlang.org/show_bug.cgi?id=11653
* 'semantic' may return another CompoundStatement
* (eg. CaseRangeStatement), so flatten it here.
*/
flatten(cs.statements);
foreach (s; *cs.statements)
{
if (!s)
continue;
if (auto se = s.isErrorStatement())
{
result = se;
return;
}
}
if (cs.statements.length == 1)
{
result = (*cs.statements)[0];
return;
}
result = cs;
}
override void visit(UnrolledLoopStatement uls)
{
//printf("UnrolledLoopStatement::semantic(this = %p, sc = %p)\n", uls, sc);
Scope* scd = sc.push();
scd.sbreak = uls;
scd.scontinue = uls;
Statement serror = null;
foreach (i, ref s; *uls.statements)
{
if (s)
{
//printf("[%d]: %s\n", i, s.toChars());
s = s.statementSemantic(scd);
if (s && !serror)
serror = s.isErrorStatement();
}
}
scd.pop();
result = serror ? serror : uls;
}
override void visit(ScopeStatement ss)
{
//printf("ScopeStatement::semantic(sc = %p)\n", sc);
if (!ss.statement)
{
result = ss;
return;
}
ScopeDsymbol sym = new ScopeDsymbol();
sym.parent = sc.scopesym;
sym.endlinnum = ss.endloc.linnum;
sc = sc.push(sym);
Statements* a = ss.statement.flatten(sc);
if (a)
{
ss.statement = new CompoundStatement(ss.loc, a);
}
ss.statement = ss.statement.statementSemantic(sc);
if (ss.statement)
{
if (ss.statement.isErrorStatement())
{
sc.pop();
result = ss.statement;
return;
}
Statement sentry;
Statement sexception;
Statement sfinally;
ss.statement = ss.statement.scopeCode(sc, sentry, sexception, sfinally);
assert(!sentry);
assert(!sexception);
if (sfinally)
{
//printf("adding sfinally\n");
sfinally = sfinally.statementSemantic(sc);
ss.statement = new CompoundStatement(ss.loc, ss.statement, sfinally);
}
}
sc.pop();
result = ss;
}
override void visit(ForwardingStatement ss)
{
assert(ss.sym);
for (Scope* csc = sc; !ss.sym.forward; csc = csc.enclosing)
{
assert(csc);
ss.sym.forward = csc.scopesym;
}
sc = sc.push(ss.sym);
sc.sbreak = ss;
sc.scontinue = ss;
ss.statement = ss.statement.statementSemantic(sc);
sc = sc.pop();
result = ss.statement;
}
override void visit(WhileStatement ws)
{
/* Rewrite as a for(;condition;) loop
* https://dlang.org/spec/statement.html#while-statement
*/
Expression cond = ws.condition;
Statement _body = ws._body;
if (ws.param)
{
/**
* If the while loop is of form `while(auto a = exp) { loop_body }`,
* rewrite to:
*
* while(true)
* if (auto a = exp)
* { loop_body }
* else
* { break; }
*/
_body = new IfStatement(ws.loc, ws.param, ws.condition, ws._body, new BreakStatement(ws.loc, null), ws.endloc);
cond = IntegerExp.createBool(true);
}
Statement s = new ForStatement(ws.loc, null, cond, null, _body, ws.endloc);
s = s.statementSemantic(sc);
result = s;
}
override void visit(DoStatement ds)
{
/* https://dlang.org/spec/statement.html#do-statement
*/
const inLoopSave = sc.inLoop;
sc.inLoop = true;
if (ds._body)
ds._body = ds._body.semanticScope(sc, ds, ds, null);
sc.inLoop = inLoopSave;
if (ds.condition.op == EXP.dotIdentifier)
(cast(DotIdExp)ds.condition).noderef = true;
// check in syntax level
ds.condition = checkAssignmentAsCondition(ds.condition, sc);
ds.condition = ds.condition.expressionSemantic(sc);
ds.condition = resolveProperties(sc, ds.condition);
if (checkNonAssignmentArrayOp(ds.condition))
ds.condition = ErrorExp.get();
ds.condition = ds.condition.optimize(WANTvalue);
ds.condition = checkGC(sc, ds.condition);
ds.condition = ds.condition.toBoolean(sc);
if (ds.condition.op == EXP.error)
return setError();
if (ds._body && ds._body.isErrorStatement())
{
result = ds._body;
return;
}
result = ds;
}
override void visit(ForStatement fs)
{
/* https://dlang.org/spec/statement.html#for-statement
*/
//printf("ForStatement::semantic %s\n", fs.toChars());
if (fs._init)
{
/* Rewrite:
* for (auto v1 = i1, v2 = i2; condition; increment) { ... }
* to:
* { auto v1 = i1, v2 = i2; for (; condition; increment) { ... } }
* then lowered to:
* auto v1 = i1;
* try {
* auto v2 = i2;
* try {
* for (; condition; increment) { ... }
* } finally { v2.~this(); }
* } finally { v1.~this(); }
*/
auto ainit = new Statements();
ainit.push(fs._init);
fs._init = null;
ainit.push(fs);
Statement s = new CompoundStatement(fs.loc, ainit);
s = new ScopeStatement(fs.loc, s, fs.endloc);
s = s.statementSemantic(sc);
if (!s.isErrorStatement())
{
if (LabelStatement ls = checkLabeledLoop(sc, fs))
ls.gotoTarget = fs;
fs.relatedLabeled = s;
}
result = s;
return;
}
assert(fs._init is null);
auto sym = new ScopeDsymbol();
sym.parent = sc.scopesym;
sym.endlinnum = fs.endloc.linnum;
sc = sc.push(sym);
sc.inLoop = true;
if (fs.condition)
{
if (fs.condition.op == EXP.dotIdentifier)
(cast(DotIdExp)fs.condition).noderef = true;
// check in syntax level
fs.condition = checkAssignmentAsCondition(fs.condition, sc);
fs.condition = fs.condition.expressionSemantic(sc);
fs.condition = resolveProperties(sc, fs.condition);
if (checkNonAssignmentArrayOp(fs.condition))
fs.condition = ErrorExp.get();
fs.condition = fs.condition.optimize(WANTvalue);
fs.condition = checkGC(sc, fs.condition);
fs.condition = fs.condition.toBoolean(sc);
}
if (fs.increment)
{
CommaExp.allow(fs.increment);
fs.increment = fs.increment.expressionSemantic(sc);
fs.increment = resolveProperties(sc, fs.increment);
if (checkNonAssignmentArrayOp(fs.increment))
fs.increment = ErrorExp.get();
fs.increment = fs.increment.optimize(WANTvalue);
fs.increment = checkGC(sc, fs.increment);
}
sc.sbreak = fs;
sc.scontinue = fs;
if (fs._body)
fs._body = fs._body.semanticNoScope(sc);
sc.pop();
if (fs.condition && fs.condition.op == EXP.error ||
fs.increment && fs.increment.op == EXP.error ||
fs._body && fs._body.isErrorStatement())
return setError();
result = fs;
}
override void visit(ForeachStatement fs)
{
/* https://dlang.org/spec/statement.html#foreach-statement
*/
//printf("ForeachStatement::semantic() %p\n", fs);
/******
* Issue error if any of the ForeachTypes were not supplied and could not be inferred.
* Returns:
* true if error issued
*/
static bool checkForArgTypes(ForeachStatement fs)
{
bool result = false;
foreach (p; *fs.parameters)
{
if (!p.type)
{
fs.error("cannot infer type for `foreach` variable `%s`, perhaps set it explicitly", p.ident.toChars());
p.type = Type.terror;
result = true;
}
}
return result;
}
const loc = fs.loc;
const dim = fs.parameters.dim;
fs.func = sc.func;
if (fs.func.fes)
fs.func = fs.func.fes.func;
VarDeclaration vinit = null;
fs.aggr = fs.aggr.expressionSemantic(sc);
fs.aggr = resolveProperties(sc, fs.aggr);
fs.aggr = fs.aggr.optimize(WANTvalue);
if (fs.aggr.op == EXP.error)
return setError();
Expression oaggr = fs.aggr; // remember original for error messages
if (fs.aggr.type && fs.aggr.type.toBasetype().ty == Tstruct &&
(cast(TypeStruct)(fs.aggr.type.toBasetype())).sym.dtor &&
!fs.aggr.isTypeExp() && !fs.aggr.isLvalue())
{
// https://issues.dlang.org/show_bug.cgi?id=14653
// Extend the life of rvalue aggregate till the end of foreach.
vinit = copyToTemp(STC.rvalue, "__aggr", fs.aggr);
vinit.endlinnum = fs.endloc.linnum;
vinit.dsymbolSemantic(sc);
fs.aggr = new VarExp(fs.aggr.loc, vinit);
}
/* If aggregate is a vector type, add the .array to make it a static array
*/
if (fs.aggr.type)
if (auto tv = fs.aggr.type.toBasetype().isTypeVector())
{
auto vae = new VectorArrayExp(fs.aggr.loc, fs.aggr);
vae.type = tv.basetype;
fs.aggr = vae;
}
Dsymbol sapply = null; // the inferred opApply() or front() function
if (!inferForeachAggregate(sc, fs.op == TOK.foreach_, fs.aggr, sapply))
{
const(char)* msg = "";
if (fs.aggr.type && isAggregate(fs.aggr.type))
{
msg = ", define `opApply()`, range primitives, or use `.tupleof`";
}
fs.error("invalid `foreach` aggregate `%s`%s", oaggr.toChars(), msg);
return setError();
}
Dsymbol sapplyOld = sapply; // 'sapply' will be NULL if and after 'inferApplyArgTypes' errors
/* Check for inference errors
*/
if (!inferApplyArgTypes(fs, sc, sapply))
{
/**
Try and extract the parameter count of the opApply callback function, e.g.:
int opApply(int delegate(int, float)) => 2 args
*/
bool foundMismatch = false;
size_t foreachParamCount = 0;
if (sapplyOld)
{
if (FuncDeclaration fd = sapplyOld.isFuncDeclaration())
{
auto fparameters = fd.getParameterList();
if (fparameters.length == 1)
{
// first param should be the callback function
Parameter fparam = fparameters[0];
if ((fparam.type.ty == Tpointer ||
fparam.type.ty == Tdelegate) &&
fparam.type.nextOf().ty == Tfunction)
{
TypeFunction tf = cast(TypeFunction)fparam.type.nextOf();
foreachParamCount = tf.parameterList.length;
foundMismatch = true;
}
}
}
}
//printf("dim = %d, parameters.dim = %d\n", dim, parameters.dim);
if (foundMismatch && dim != foreachParamCount)
{
const(char)* plural = foreachParamCount > 1 ? "s" : "";
fs.error("cannot infer argument types, expected %llu argument%s, not %llu",
cast(ulong) foreachParamCount, plural, cast(ulong) dim);
}
else
fs.error("cannot uniquely infer `foreach` argument types");
return setError();
}
Type tab = fs.aggr.type.toBasetype();
if (tab.ty == Ttuple) // don't generate new scope for tuple loops
{
Statement s = makeTupleForeach(sc, false, false, fs, null, false).statement;
if (vinit)
s = new CompoundStatement(loc, new ExpStatement(loc, vinit), s);
result = s.statementSemantic(sc);
return;
}
auto sym = new ScopeDsymbol();
sym.parent = sc.scopesym;
sym.endlinnum = fs.endloc.linnum;
auto sc2 = sc.push(sym);
sc2.inLoop = true;
foreach (Parameter p; *fs.parameters)
{
if (p.storageClass & STC.manifest)
{
fs.error("cannot declare `enum` loop variables for non-unrolled foreach");
}
if (p.storageClass & STC.alias_)
{
fs.error("cannot declare `alias` loop variables for non-unrolled foreach");
}
}
void retError()
{
sc2.pop();
result = new ErrorStatement();
}
void rangeError()
{
fs.error("cannot infer argument types");
return retError();
}
void retStmt(Statement s)
{
if (!s)
return retError();
s = s.statementSemantic(sc2);
sc2.pop();
result = s;
}
TypeAArray taa = null;
Type tn = null;
Type tnv = null;
Statement apply()
{
if (checkForArgTypes(fs))
return null;
TypeFunction tfld = null;
if (sapply)
{
FuncDeclaration fdapply = sapply.isFuncDeclaration();
if (fdapply)
{
assert(fdapply.type && fdapply.type.ty == Tfunction);
tfld = cast(TypeFunction)fdapply.type.typeSemantic(loc, sc2);
goto Lget;
}
else if (tab.ty == Tdelegate)
{
tfld = cast(TypeFunction)tab.nextOf();
Lget:
//printf("tfld = %s\n", tfld.toChars());
if (tfld.parameterList.parameters.dim == 1)
{
Parameter p = tfld.parameterList[0];
if (p.type && p.type.ty == Tdelegate)
{
auto t = p.type.typeSemantic(loc, sc2);
assert(t.ty == Tdelegate);
tfld = cast(TypeFunction)t.nextOf();
}
//printf("tfld = %s\n", tfld.toChars());
}
}
}
FuncExp flde = foreachBodyToFunction(sc2, fs, tfld);
if (!flde)
return null;
// Resolve any forward referenced goto's
foreach (ScopeStatement ss; *fs.gotos)
{
GotoStatement gs = ss.statement.isGotoStatement();
if (!gs.label.statement)
{
// 'Promote' it to this scope, and replace with a return
fs.cases.push(gs);
ss.statement = new ReturnStatement(Loc.initial, new IntegerExp(fs.cases.dim + 1));
}
}
Expression e = null;
Expression ec;
if (vinit)
{
e = new DeclarationExp(loc, vinit);
e = e.expressionSemantic(sc2);
if (e.op == EXP.error)
return null;
}
if (taa)
ec = applyAssocArray(fs, flde, taa);
else if (tab.ty == Tarray || tab.ty == Tsarray)
ec = applyArray(fs, flde, sc2, tn, tnv, tab.ty);
else if (tab.ty == Tdelegate)
ec = applyDelegate(fs, flde, sc2, tab);
else
ec = applyOpApply(fs, tab, sapply, sc2, flde);
if (!ec)
return null;
e = Expression.combine(e, ec);
return loopReturn(e, fs.cases, loc);
}
switch (tab.ty)
{
case Tarray:
case Tsarray:
{
if (checkForArgTypes(fs))
return retError();
if (dim < 1 || dim > 2)
{
fs.error("only one or two arguments for array `foreach`");
return retError();
}
// Finish semantic on all foreach parameter types.
foreach (i; 0 .. dim)
{
Parameter p = (*fs.parameters)[i];
p.type = p.type.typeSemantic(loc, sc2);
p.type = p.type.addStorageClass(p.storageClass);
}
tn = tab.nextOf().toBasetype();
if (dim == 2)
{
Type tindex = (*fs.parameters)[0].type;
if (!tindex.isintegral())
{
fs.error("foreach: key cannot be of non-integral type `%s`", tindex.toChars());
return retError();
}
/* What cases to deprecate implicit conversions for:
* 1. foreach aggregate is a dynamic array
* 2. foreach body is lowered to _aApply (see special case below).
*/
Type tv = (*fs.parameters)[1].type.toBasetype();
if ((tab.ty == Tarray ||
(tn.ty != tv.ty && tn.ty.isSomeChar && tv.ty.isSomeChar)) &&
!Type.tsize_t.implicitConvTo(tindex))
{
fs.deprecation("foreach: loop index implicitly converted from `size_t` to `%s`",
tindex.toChars());
}
}
/* Look for special case of parsing char types out of char type
* array.
*/
if (tn.ty.isSomeChar)
{
int i = (dim == 1) ? 0 : 1; // index of value
Parameter p = (*fs.parameters)[i];
tnv = p.type.toBasetype();
if (tnv.ty != tn.ty && tnv.ty.isSomeChar)
{
if (p.storageClass & STC.ref_)
{
fs.error("`foreach`: value of UTF conversion cannot be `ref`");
return retError();
}
if (dim == 2)
{
p = (*fs.parameters)[0];
if (p.storageClass & STC.ref_)
{
fs.error("`foreach`: key cannot be `ref`");
return retError();
}
}
return retStmt(apply());
}
}
// Declare the key
if (dim == 2)
{
Parameter p = (*fs.parameters)[0];
auto var = new VarDeclaration(loc, p.type.mutableOf(), Identifier.generateId("__key"), null);
var.storage_class |= STC.temp | STC.foreach_;
if (var.storage_class & (STC.ref_ | STC.out_))
var.storage_class |= STC.nodtor;
fs.key = var;
if (p.storageClass & STC.ref_)
{
if (var.type.constConv(p.type) == MATCH.nomatch)
{
fs.error("key type mismatch, `%s` to `ref %s`",