/
todt.d
1629 lines (1406 loc) · 51.3 KB
/
todt.d
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/**
* Put initializers and objects created from CTFE into a `dt_t` data structure
* so the backend puts them into the data segment.
*
* Copyright: Copyright (C) 1999-2024 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/todt.d, _todt.d)
* Documentation: https://dlang.org/phobos/dmd_todt.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/todt.d
*/
module dmd.todt;
import core.stdc.stdio;
import core.stdc.string;
import dmd.root.array;
import dmd.root.complex;
import dmd.root.rmem;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.astenums;
import dmd.backend.type;
import dmd.ctfeexpr;
import dmd.declaration;
import dmd.dclass;
import dmd.denum;
import dmd.dstruct;
import dmd.dsymbol;
import dmd.dtemplate;
import dmd.errors;
import dmd.expression;
import dmd.func;
import dmd.globals;
import dmd.glue;
import dmd.init;
import dmd.location;
import dmd.mtype;
import dmd.optimize;
import dmd.target;
import dmd.tokens;
import dmd.tocsym;
import dmd.toobj;
import dmd.typesem;
import dmd.visitor;
import dmd.backend.cc;
import dmd.backend.dt;
/* A dt_t is a simple structure representing data to be added
* to the data segment of the output object file. As such,
* it is a list of initialized bytes, 0 data, and offsets from
* other symbols.
* Each D symbol and type can be converted into a dt_t so it can
* be written to the data segment.
*/
alias Dts = Array!(dt_t*);
/* ================================================================ */
void Initializer_toDt(Initializer init, ref DtBuilder dtb, bool isCfile)
{
void visitError(ErrorInitializer)
{
assert(0);
}
void visitVoid(VoidInitializer vi)
{
/* Void initializers are set to 0, just because we need something
* to set them to in the static data segment.
*/
dtb.nzeros(cast(uint)vi.type.size());
}
void visitStruct(StructInitializer si)
{
/* The StructInitializer was converted to a StructLiteralExp,
* which is converted to dtb by membersToDt()
*/
//printf("StructInitializer.toDt('%s')\n", si.toChars());
assert(0);
}
void visitArray(ArrayInitializer ai)
{
//printf("ArrayInitializer.toDt('%s')\n", ai.toChars());
Type tb = ai.type.toBasetype();
if (tb.ty == Tvector)
tb = (cast(TypeVector)tb).basetype;
if (ai.dim == 0 && tb.isZeroInit(ai.loc))
{
dtb.nzeros(cast(uint)ai.type.size());
return;
}
Type tn = tb.nextOf().toBasetype();
//printf("\tdim = %d\n", ai.dim);
Dts dts = Dts(ai.dim);
dts.zero();
uint size = cast(uint)tn.size();
uint length = 0;
foreach (i, idx; ai.index)
{
if (idx)
length = cast(uint)idx.toInteger();
//printf("\tindex[%d] = %p, length = %u, dim = %u\n", i, idx, length, ai.dim);
assert(length < ai.dim);
auto dtb = DtBuilder(0);
Initializer_toDt(ai.value[i], dtb, isCfile);
if (dts[length] && !ai.isCarray)
error(ai.loc, "duplicate initializations for index `%d`", length);
dts[length] = dtb.finish();
length++;
}
Expression edefault = tb.nextOf().defaultInit(Loc.initial, isCfile);
const n = tn.numberOfElems(ai.loc);
dt_t* dtdefault = null;
auto dtbarray = DtBuilder(0);
foreach (dt; dts)
{
if (dt)
dtbarray.cat(dt);
else
{
if (!dtdefault)
{
auto dtb = DtBuilder(0);
Expression_toDt(edefault, dtb);
dtdefault = dtb.finish();
}
dtbarray.repeat(dtdefault, n);
}
}
switch (tb.ty)
{
case Tsarray:
{
TypeSArray ta = cast(TypeSArray)tb;
size_t tadim = cast(size_t)ta.dim.toInteger();
if (ai.dim < tadim)
{
if (edefault.toBool().hasValue(false))
{
// pad out end of array
dtbarray.nzeros(cast(uint)(size * (tadim - ai.dim)));
}
else
{
if (!dtdefault)
{
auto dtb = DtBuilder(0);
Expression_toDt(edefault, dtb);
dtdefault = dtb.finish();
}
const m = n * (tadim - ai.dim);
assert(m <= uint.max);
dtbarray.repeat(dtdefault, cast(uint)m);
}
}
else if (ai.dim > tadim)
{
error(ai.loc, "too many initializers, %u, for array[%llu]", ai.dim, cast(ulong) tadim);
}
dtb.cat(dtbarray);
break;
}
case Tpointer:
case Tarray:
{
if (tb.ty == Tarray)
dtb.size(ai.dim);
Symbol* s = dtb.dtoff(dtbarray.finish(), 0);
if (tn.isMutable())
foreach (i; 0 .. ai.dim)
write_pointers(tn, s, size * cast(int)i);
break;
}
default:
assert(0);
}
dt_free(dtdefault);
}
void visitExp(ExpInitializer ei)
{
//printf("ExpInitializer.toDt() %s\n", ei.exp.toChars());
ei.exp = ei.exp.optimize(WANTvalue);
Expression_toDt(ei.exp, dtb);
}
void visitC(CInitializer ci)
{
/* Should have been rewritten to Exp/Struct/ArrayInitializer by semantic()
*/
assert(0);
}
void visitDefault(DefaultInitializer di)
{
/* Default initializers are set to 0, because C23 says so
*/
dtb.nzeros(cast(uint)di.type.size());
}
mixin VisitInitializer!void visit;
visit.VisitInitializer(init);
}
/* ================================================================ */
void Expression_toDt(Expression e, ref DtBuilder dtb)
{
dtb.checkInitialized();
void nonConstExpError(Expression e)
{
version (none)
{
printf("Expression.toDt() op = %d e = %s \n", e.op, e.toChars());
}
error(e.loc, "non-constant expression `%s`", e.toChars());
dtb.nzeros(1);
}
void visitSlice(SliceExp e)
{
version (none)
{
printf("SliceExp.toDt() %d from %s to %s\n", e.op, e.e1.type.toChars(), e.type.toChars());
}
if (!e.lwr && !e.upr)
return Expression_toDt(e.e1, dtb);
if (auto strExp = e.e1.isStringExp())
{
auto lwr = e.lwr.isIntegerExp();
auto upr = e.upr.isIntegerExp();
if (lwr && upr && lwr.toInteger() == 0 && upr.toInteger() == strExp.len)
return Expression_toDt(e.e1, dtb);
}
nonConstExpError(e);
}
void visitCast(CastExp e)
{
version (none)
{
printf("CastExp.toDt() %d from %s to %s\n", e.op, e.e1.type.toChars(), e.type.toChars());
}
if (e.e1.type.ty == Tclass)
{
if (auto toc = e.type.isTypeClass())
{
if (auto toi = toc.sym.isInterfaceDeclaration()) // casting from class to interface
{
auto cre1 = e.e1.isClassReferenceExp();
ClassDeclaration from = cre1.originalClass();
int off = 0;
const isbase = toi.isBaseOf(from, &off);
assert(isbase);
ClassReferenceExp_toDt(cre1, dtb, off);
}
else //casting from class to class
{
Expression_toDt(e.e1, dtb);
}
return;
}
}
nonConstExpError(e);
}
void visitAddr(AddrExp e)
{
version (none)
{
printf("AddrExp.toDt() %d\n", e.op);
}
if (auto sl = e.e1.isStructLiteralExp())
{
Symbol* s = toSymbol(sl);
dtb.xoff(s, 0);
if (sl.type.isMutable())
write_pointers(sl.type, s, 0);
return;
}
nonConstExpError(e);
}
void visitInteger(IntegerExp e)
{
//printf("IntegerExp.toDt() %d\n", e.op);
const sz = cast(uint)e.type.size();
if (auto value = e.getInteger())
dtb.nbytes(sz, cast(char*)&value);
else
dtb.nzeros(sz);
}
void visitReal(RealExp e)
{
//printf("RealExp.toDt(%Lg)\n", e.value);
switch (e.type.toBasetype().ty)
{
case Tfloat32:
case Timaginary32:
{
auto fvalue = cast(float)e.value;
dtb.nbytes(4, cast(char*)&fvalue);
break;
}
case Tfloat64:
case Timaginary64:
{
auto dvalue = cast(double)e.value;
dtb.nbytes(8, cast(char*)&dvalue);
break;
}
case Tfloat80:
case Timaginary80:
{
auto evalue = e.value;
dtb.nbytes(target.realsize - target.realpad, cast(char*)&evalue);
dtb.nzeros(target.realpad);
break;
}
default:
printf("%s, e.type=%s\n", e.toChars(), e.type.toChars());
assert(0);
}
}
void visitComplex(ComplexExp e)
{
//printf("ComplexExp.toDt() '%s'\n", e.toChars());
switch (e.type.toBasetype().ty)
{
case Tcomplex32:
{
auto fvalue = cast(float)creall(e.value);
dtb.nbytes(4, cast(char*)&fvalue);
fvalue = cast(float)cimagl(e.value);
dtb.nbytes(4, cast(char*)&fvalue);
break;
}
case Tcomplex64:
{
auto dvalue = cast(double)creall(e.value);
dtb.nbytes(8, cast(char*)&dvalue);
dvalue = cast(double)cimagl(e.value);
dtb.nbytes(8, cast(char*)&dvalue);
break;
}
case Tcomplex80:
{
auto evalue = creall(e.value);
dtb.nbytes(target.realsize - target.realpad, cast(char*)&evalue);
dtb.nzeros(target.realpad);
evalue = cimagl(e.value);
dtb.nbytes(target.realsize - target.realpad, cast(char*)&evalue);
dtb.nzeros(target.realpad);
break;
}
default:
assert(0);
}
}
void visitNull(NullExp e)
{
assert(e.type);
dtb.nzeros(cast(uint)e.type.size());
}
void visitString(StringExp e)
{
//printf("StringExp.toDt() '%s', type = %s\n", e.toChars(), e.type.toChars());
Type t = e.type.toBasetype();
// BUG: should implement some form of static string pooling
const n = cast(int)e.numberOfCodeUnits();
const(char)* p;
char* q;
if (e.sz == 1)
p = e.peekString().ptr;
else
{
q = cast(char*)mem.xmalloc(n * e.sz);
e.writeTo(q, false);
p = q;
}
switch (t.ty)
{
case Tarray:
dtb.size(n);
goto case Tpointer;
case Tpointer:
if (e.sz == 1)
{
import dmd.e2ir : toStringSymbol;
import dmd.glue : totym;
Symbol* s = toStringSymbol(p, n, e.sz);
dtb.xoff(s, 0);
}
else
{
import core.bitop : bsr;
const pow2 = cast(ubyte) bsr(e.sz);
dtb.abytes(0, n * e.sz, p, cast(uint) e.sz, pow2);
}
break;
case Tsarray:
{
auto tsa = t.isTypeSArray();
dtb.nbytes(n * e.sz, p);
if (tsa.dim)
{
dinteger_t dim = tsa.dim.toInteger();
if (n < dim)
{
// Pad remainder with 0
dtb.nzeros(cast(uint)((dim - n) * tsa.next.size()));
}
}
break;
}
default:
printf("StringExp.toDt(type = %s)\n", e.type.toChars());
assert(0);
}
mem.xfree(q);
}
void visitArrayLiteral(ArrayLiteralExp e)
{
//printf("ArrayLiteralExp.toDt() '%s', type = %s\n", e.toChars(), e.type.toChars());
auto dtbarray = DtBuilder(0);
foreach (i; 0 .. e.elements.length)
{
Expression_toDt(e[i], dtbarray);
}
Type t = e.type.toBasetype();
switch (t.ty)
{
case Tsarray:
dtb.cat(dtbarray);
break;
case Tarray:
dtb.size(e.elements.length);
goto case Tpointer;
case Tpointer:
{
if (auto d = dtbarray.finish())
dtb.dtoff(d, 0);
else
dtb.size(0);
break;
}
default:
assert(0);
}
}
/* https://issues.dlang.org/show_bug.cgi?id=12652
Non-constant hash initializers should have a special-case diagnostic
*/
void visitAssocArrayLiteral(AssocArrayLiteralExp e)
{
if (!e.lowering)
{
error(e.loc, "internal compiler error: failed to detect static initialization of associative array");
assert(0);
}
Expression_toDt(e.lowering, dtb);
return;
}
void visitStructLiteral(StructLiteralExp sle)
{
//printf("StructLiteralExp.toDt() %s, ctfe = %d\n", sle.toChars(), sle.ownedByCtfe);
assert(sle.sd.nonHiddenFields() <= sle.elements.length);
membersToDt(sle.sd, dtb, sle.elements, 0, null, null);
}
void visitSymOff(SymOffExp e)
{
//printf("SymOffExp.toDt('%s')\n", e.var.toChars());
assert(e.var);
if (!(e.var.isDataseg() || e.var.isCodeseg()) ||
e.var.isThreadlocal())
{
return nonConstExpError(e);
}
dtb.xoff(toSymbol(e.var), cast(uint)e.offset);
}
void visitVar(VarExp e)
{
//printf("VarExp.toDt() %d\n", e.op);
if (auto v = e.var.isVarDeclaration())
{
if ((v.isConst() || v.isImmutable()) &&
e.type.toBasetype().ty != Tsarray && v._init)
{
error(e.loc, "recursive reference `%s`", e.toChars());
return;
}
v.inuse++;
Initializer_toDt(v._init, dtb, v.isCsymbol());
v.inuse--;
return;
}
if (auto sd = e.var.isSymbolDeclaration())
{
if (sd.dsym)
{
if (auto s = sd.dsym.isStructDeclaration())
StructDeclaration_toDt(s, dtb);
else if (auto c = sd.dsym.isClassDeclaration())
// Should be unreachable ATM, but just to be sure
ClassDeclaration_toDt(c, dtb);
else
assert(false);
return;
}
}
return nonConstExpError(e);
}
void visitFunc(FuncExp e)
{
//printf("FuncExp.toDt() %d\n", e.op);
if (e.fd.tok == TOK.reserved && e.type.ty == Tpointer)
{
// change to non-nested
e.fd.tok = TOK.function_;
e.fd.vthis = null;
}
Symbol *s = toSymbol(e.fd);
toObjFile(e.fd, false);
if (e.fd.tok == TOK.delegate_)
dtb.size(0);
dtb.xoff(s, 0);
}
void visitVector(VectorExp e)
{
//printf("VectorExp.toDt() %s\n", e.toChars());
foreach (i; 0 .. e.dim)
{
Expression elem;
if (auto ale = e.e1.isArrayLiteralExp())
elem = ale[i];
else
elem = e.e1;
Expression_toDt(elem, dtb);
}
}
void visitClassReference(ClassReferenceExp e)
{
auto to = e.type.toBasetype().isTypeClass().sym.isInterfaceDeclaration();
if (to) //Static typeof this literal is an interface. We must add offset to symbol
{
ClassDeclaration from = e.originalClass();
int off = 0;
const isbase = to.isBaseOf(from, &off);
assert(isbase);
ClassReferenceExp_toDt(e, dtb, off);
}
else
ClassReferenceExp_toDt(e, dtb, 0);
}
void visitTypeid(TypeidExp e)
{
if (Type t = isType(e.obj))
{
TypeInfo_toObjFile(e, e.loc, t);
Symbol *s = toSymbol(t.vtinfo);
dtb.xoff(s, 0);
return;
}
assert(0);
}
void visitNoreturn(Expression e)
{
// Noreturn field with default initializer
assert(e);
}
switch (e.op)
{
default: return nonConstExpError(e);
case EXP.cast_: return visitCast (e.isCastExp());
case EXP.address: return visitAddr (e.isAddrExp());
case EXP.int64: return visitInteger (e.isIntegerExp());
case EXP.float64: return visitReal (e.isRealExp());
case EXP.complex80: return visitComplex (e.isComplexExp());
case EXP.null_: return visitNull (e.isNullExp());
case EXP.string_: return visitString (e.isStringExp());
case EXP.arrayLiteral: return visitArrayLiteral (e.isArrayLiteralExp());
case EXP.structLiteral: return visitStructLiteral (e.isStructLiteralExp());
case EXP.symbolOffset: return visitSymOff (e.isSymOffExp());
case EXP.variable: return visitVar (e.isVarExp());
case EXP.function_: return visitFunc (e.isFuncExp());
case EXP.vector: return visitVector (e.isVectorExp());
case EXP.classReference: return visitClassReference(e.isClassReferenceExp());
case EXP.typeid_: return visitTypeid (e.isTypeidExp());
case EXP.assert_: return visitNoreturn (e);
case EXP.slice: return visitSlice (e.isSliceExp());
case EXP.assocArrayLiteral: return visitAssocArrayLiteral(e.isAssocArrayLiteralExp());
}
}
/* ================================================================= */
// Generate the data for the static initializer.
void ClassDeclaration_toDt(ClassDeclaration cd, ref DtBuilder dtb)
{
//printf("ClassDeclaration.toDt(this = '%s')\n", cd.toChars());
membersToDt(cd, dtb, null, 0, cd, null);
//printf("-ClassDeclaration.toDt(this = '%s')\n", cd.toChars());
}
void StructDeclaration_toDt(StructDeclaration sd, ref DtBuilder dtb)
{
//printf("+StructDeclaration.toDt(), this='%s'\n", sd.toChars());
membersToDt(sd, dtb, null, 0, null, null);
//printf("-StructDeclaration.toDt(), this='%s'\n", sd.toChars());
}
/******************************
* Generate data for instance of __cpp_type_info_ptr that refers
* to the C++ RTTI symbol for cd.
* Params:
* cd = C++ class
* dtb = data table builder
*/
void cpp_type_info_ptr_toDt(ClassDeclaration cd, ref DtBuilder dtb)
{
//printf("cpp_type_info_ptr_toDt(this = '%s')\n", cd.toChars());
assert(cd.isCPPclass());
// Put in first two members, the vtbl[] and the monitor
dtb.xoff(toVtblSymbol(ClassDeclaration.cpp_type_info_ptr), 0);
if (ClassDeclaration.cpp_type_info_ptr.hasMonitor())
dtb.size(0); // monitor
// Create symbol for C++ type info
Symbol *s = toSymbolCppTypeInfo(cd);
// Put in address of cd's C++ type info
dtb.xoff(s, 0);
//printf("-cpp_type_info_ptr_toDt(this = '%s')\n", cd.toChars());
}
/****************************************************
* Put out initializers of ad.fields[].
* Although this is consistent with the elements[] version, we
* have to use this optimized version to reduce memory footprint.
* Params:
* ad = aggregate with members
* dtb = initializer list to append initialized data to
* elements = values to use as initializers, null means use default initializers
* firstFieldIndex = starting place in elements[firstFieldIndex]; always 0 for structs
* concreteType = structs: null, classes: most derived class
* ppb = pointer that moves through BaseClass[] from most derived class
* Returns:
* updated tail of dt_t list
*/
private void membersToDt(AggregateDeclaration ad, ref DtBuilder dtb,
Expressions* elements, size_t firstFieldIndex,
ClassDeclaration concreteType,
BaseClass*** ppb)
{
ClassDeclaration cd = ad.isClassDeclaration();
const bool isCtype = ad.isCsymbol();
version (none)
{
printf("membersToDt(ad = '%s', concrete = '%s', ppb = %p)\n", ad.toChars(), concreteType ? concreteType.toChars() : "null", ppb);
version (none)
{
printf(" interfaces.length = %d\n", cast(int)cd.interfaces.length);
foreach (i, b; cd.vtblInterfaces[])
{
printf(" vbtblInterfaces[%d] b = %p, b.sym = %s\n", cast(int)i, b, b.sym.toChars());
}
}
version (all)
{
foreach (i, field; ad.fields)
{
if (auto bf = field.isBitFieldDeclaration())
printf(" fields[%d]: %s %2d bitoffset %2d width %2d\n", cast(int)i, bf.toChars(), bf.offset, bf.bitOffset, bf.fieldWidth);
else
printf(" fields[%d]: %s %2d\n", cast(int)i, field.toChars(), field.offset);
}
}
version (none)
{
printf(" firstFieldIndex: %d\n", cast(int)firstFieldIndex);
foreach (i; 0 .. elements.length)
{
auto e = (*elements)[i];
printf(" elements[%d]: %s\n", cast(int)i, e ? e.toChars() : "null");
}
}
}
dtb.checkInitialized();
//printf("+dtb.length: %d\n", dtb.length);
/* Order:
* { base class } or { __vptr, __monitor }
* interfaces
* fields
*/
uint offset;
if (cd)
{
const bool gentypeinfo = global.params.useTypeInfo && Type.dtypeinfo;
const bool genclassinfo = gentypeinfo || !(cd.isCPPclass || cd.isCOMclass);
if (ClassDeclaration cdb = cd.baseClass)
{
// Insert { base class }
size_t index = 0;
for (ClassDeclaration c = cdb.baseClass; c; c = c.baseClass)
index += c.fields.length;
membersToDt(cdb, dtb, elements, index, concreteType, null);
offset = cdb.structsize;
}
else if (InterfaceDeclaration id = cd.isInterfaceDeclaration())
{
offset = (**ppb).offset;
if (id.vtblInterfaces.length == 0 && genclassinfo)
{
BaseClass* b = **ppb;
//printf(" Interface %s, b = %p\n", id.toChars(), b);
++(*ppb);
for (ClassDeclaration cd2 = concreteType; 1; cd2 = cd2.baseClass)
{
assert(cd2);
uint csymoffset = baseVtblOffset(cd2, b);
//printf(" cd2 %s csymoffset = x%x\n", cd2 ? cd2.toChars() : "null", csymoffset);
if (csymoffset != ~0)
{
dtb.xoff(toSymbol(cd2), csymoffset);
offset += target.ptrsize;
break;
}
}
}
}
else
{
// Insert { __vptr, __monitor }
dtb.xoff(toVtblSymbol(concreteType), 0); // __vptr
offset = target.ptrsize;
if (cd.hasMonitor())
{
dtb.size(0); // __monitor
offset += target.ptrsize;
}
}
// Interface vptr initializations
if (genclassinfo)
{
toSymbol(cd); // define csym
}
BaseClass** pb;
if (!ppb)
{
pb = (*cd.vtblInterfaces)[].ptr;
ppb = &pb;
}
foreach (si; cd.interfaces[])
{
BaseClass* b = **ppb;
if (offset < b.offset)
dtb.nzeros(b.offset - offset);
membersToDt(si.sym, dtb, elements, firstFieldIndex, concreteType, ppb);
//printf("b.offset = %d, b.sym.structsize = %d\n", cast(int)b.offset, cast(int)b.sym.structsize);
offset = b.offset + b.sym.structsize;
}
}
else
offset = 0;
// `offset` now is where the fields start
assert(!elements ||
firstFieldIndex <= elements.length &&
firstFieldIndex + ad.fields.length <= elements.length);
uint bitByteOffset = 0; // byte offset of bit field
uint bitOffset = 0; // starting bit number
ulong bitFieldValue = 0; // in-flight bit field value
uint bitFieldSize; // in-flight size in bytes of bit field
void finishInFlightBitField()
{
if (bitOffset)
{
//printf("finishInFlightBitField() offset %d bitOffset %d bitFieldSize %d bitFieldValue x%llx\n", offset, bitOffset, bitFieldSize, bitFieldValue);
assert(bitFieldSize);
// advance to start of bit field
if (offset < bitByteOffset)
{
dtb.nzeros(bitByteOffset - offset);
offset = bitByteOffset;
}
dtb.nbytes(bitFieldSize, cast(char*)&bitFieldValue);
offset += bitFieldSize;
bitOffset = 0;
bitFieldValue = 0;
bitFieldSize = 0;
}
}
static if (0)
{
foreach (i, field; ad.fields)
{
if (elements && !(*elements)[firstFieldIndex + i])
continue; // no element for this field
if (!elements || !(*elements)[firstFieldIndex + i])
{
if (field._init && field._init.isVoidInitializer())
continue; // void initializer for this field
}
VarDeclaration vd = field;
auto bf = vd.isBitFieldDeclaration();
if (bf)
printf("%s\t offset: %d width: %u bit: %u\n", bf.toChars(), bf.offset, bf.fieldWidth, bf.bitOffset);
else
printf("%s\t offset: %d\n", vd.toChars(), vd.offset);
}
}
foreach (i, field; ad.fields)
{
// skip if no element for this field
if (elements && !(*elements)[firstFieldIndex + i])
continue;
// If void initializer
if (!elements || !(*elements)[firstFieldIndex + i])
{
if (field._init && field._init.isVoidInitializer())
continue;
}
/* This loop finds vd, the closest field that starts at `offset + bitOffset` or later
*/
VarDeclaration vd;
// Cache some extra information about vd
BitFieldDeclaration bf; // bit field version of vd
size_t k; // field index of vd
uint vdBitOffset; // starting bit number of vd; 0 if not a bit field
foreach (j; i .. ad.fields.length)
{
VarDeclaration v2 = ad.fields[j];
if (v2.offset < offset)
continue;
if (elements && !(*elements)[firstFieldIndex + j])
continue;
if (!elements || !(*elements)[firstFieldIndex + j])
{
if (v2._init && v2._init.isVoidInitializer())
continue;
}
//printf(" checking v2 %s %d\n", v2.toChars(), v2.offset);
auto bf2 = v2.isBitFieldDeclaration();
uint v2BitOffset = bf2 ? bf2.bitOffset : 0;
if (v2.offset * 8 + v2BitOffset < offset * 8 + vdBitOffset)
continue;
// find the nearest field
if (!vd ||
v2.offset * 8 + v2BitOffset < vd.offset * 8 + vdBitOffset)
{
// v2 is nearer, so remember the details
//printf(" v2 %s is nearer\n", v2.toChars());
vd = v2;
bf = bf2;
vdBitOffset = v2BitOffset;
k = j;
}
}
if (!vd)
{
continue;
}
if (!bf || bf.offset != offset)
{
finishInFlightBitField();
}
if (bf)
{
switch (target.c.bitFieldStyle)
{
case TargetC.BitFieldStyle.Gcc_Clang:
bitFieldSize = (bf.bitOffset + bf.fieldWidth + 7) / 8;
break;
case TargetC.BitFieldStyle.DM:
case TargetC.BitFieldStyle.MS:
// This relies on all bit fields in the same storage location have the same type
bitFieldSize = cast(uint)vd.type.size();
break;
default:
assert(0);
}
}
//printf("offset: %u, vd: %s vd.offset: %u\n", offset, vd.toChars(), vd.offset);
if (vd.offset < offset)
continue; // a union field
if (offset < vd.offset)
{
dtb.nzeros(vd.offset - offset);
offset = vd.offset;
}
auto dtbx = DtBuilder(0);
if (elements)
{
Expression e = (*elements)[firstFieldIndex + k];
//printf("elements initializer %s\n", e.toChars());
if (auto tsa = vd.type.toBasetype().isTypeSArray())
toDtElem(tsa, dtbx, e, isCtype);
else if (bf)
{
auto ie = e.isIntegerExp();
assert(ie);
auto value = ie.getInteger();
const width = bf.fieldWidth;
const mask = (1L << width) - 1;
bitFieldValue = (bitFieldValue & ~(mask << bitOffset)) | ((value & mask) << bitOffset);
//printf("bitFieldValue x%llx\n", bitFieldValue);
}
else