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toir.d
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toir.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (c) 1999-2016 by Digital Mars, All Rights Reserved
* Authors: $(LINK2 http://www.digitalmars.com, Walter Bright)
* License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/_tocsym.d, _toir.d)
*/
module ddmd.toir;
import core.stdc.stdio;
import core.stdc.string;
import core.stdc.stdlib;
import ddmd.root.array;
import ddmd.root.outbuffer;
import ddmd.root.rmem;
import ddmd.backend.cdef;
import ddmd.backend.cc;
import ddmd.backend.dt;
import ddmd.backend.el;
import ddmd.backend.global;
import ddmd.backend.oper;
import ddmd.backend.rtlsym;
import ddmd.backend.ty;
import ddmd.backend.type;
import ddmd.aggregate;
import ddmd.arraytypes;
import ddmd.dclass;
import ddmd.declaration;
import ddmd.dmangle;
import ddmd.dmodule;
import ddmd.dstruct;
import ddmd.dsymbol;
import ddmd.dtemplate;
import ddmd.toctype;
import ddmd.e2ir;
import ddmd.func;
import ddmd.globals;
import ddmd.glue;
import ddmd.identifier;
import ddmd.id;
import ddmd.irstate;
import ddmd.mtype;
import ddmd.target;
import ddmd.tocsym;
alias toSymbol = ddmd.tocsym.toSymbol;
alias toSymbol = ddmd.glue.toSymbol;
extern (C++):
/*********************************************
* Produce elem which increments the usage count for a particular line.
* Used to implement -cov switch (coverage analysis).
*/
elem *incUsageElem(IRState *irs, Loc loc)
{
uint linnum = loc.linnum;
Module m = cast(Module)irs.blx._module;
if (!m.cov || !linnum ||
loc.filename != m.srcfile.toChars())
return null;
//printf("cov = %p, covb = %p, linnum = %u\n", m.cov, m.covb, p, linnum);
linnum--; // from 1-based to 0-based
/* Set bit in covb[] indicating this is a valid code line number
*/
uint *p = m.covb;
if (p) // covb can be null if it has already been written out to its .obj file
{
assert(linnum < m.numlines);
p += linnum / ((*p).sizeof * 8);
*p |= 1 << (linnum & ((*p).sizeof * 8 - 1));
}
elem *e;
e = el_ptr(m.cov);
e = el_bin(OPadd, TYnptr, e, el_long(TYuint, linnum * 4));
e = el_una(OPind, TYuint, e);
e = el_bin(OPaddass, TYuint, e, el_long(TYuint, 1));
return e;
}
/******************************************
* Return elem that evaluates to the static frame pointer for function fd.
* If fd is a member function, the returned expression will compute the value
* of fd's 'this' variable.
* This routine is critical for implementing nested functions.
*/
elem *getEthis(Loc loc, IRState *irs, Dsymbol fd)
{
elem *ethis;
FuncDeclaration thisfd = irs.getFunc();
Dsymbol fdparent = fd.toParent2();
Dsymbol fdp = fdparent;
/* These two are compiler generated functions for the in and out contracts,
* and are called from an overriding function, not just the one they're
* nested inside, so this hack is so they'll pass
*/
if (fdparent != thisfd && (fd.ident == Id.require || fd.ident == Id.ensure))
{
FuncDeclaration fdthis = thisfd;
for (size_t i = 0; ; )
{
if (i == fdthis.foverrides.dim)
{
if (i == 0)
break;
fdthis = fdthis.foverrides[0];
i = 0;
continue;
}
if (fdthis.foverrides[i] == fdp)
{
fdparent = thisfd;
break;
}
i++;
}
}
//printf("[%s] getEthis(thisfd = '%s', fd = '%s', fdparent = '%s')\n", loc.toChars(), thisfd.toPrettyChars(), fd.toPrettyChars(), fdparent.toPrettyChars());
if (fdparent == thisfd)
{
/* Going down one nesting level, i.e. we're calling
* a nested function from its enclosing function.
*/
if (irs.sclosure && !(fd.ident == Id.require || fd.ident == Id.ensure))
{
ethis = el_var(irs.sclosure);
}
else if (irs.sthis)
{
// We have a 'this' pointer for the current function
if (fdp != thisfd)
{
/* fdparent (== thisfd) is a derived member function,
* fdp is the overridden member function in base class, and
* fd is the nested function '__require' or '__ensure'.
* Even if there's a closure environment, we should give
* original stack data as the nested function frame.
* See also: SymbolExp.toElem() in e2ir.c (Bugzilla 9383 fix)
*/
/* Address of 'sthis' gives the 'this' for the nested
* function.
*/
//printf("L%d fd = %s, fdparent = %s, fd.toParent2() = %s\n",
// __LINE__, fd.toPrettyChars(), fdparent.toPrettyChars(), fdp.toPrettyChars());
assert(fd.ident == Id.require || fd.ident == Id.ensure);
assert(thisfd.hasNestedFrameRefs());
ClassDeclaration cdp = fdp.isThis().isClassDeclaration();
ClassDeclaration cd = thisfd.isThis().isClassDeclaration();
assert(cdp && cd);
int offset;
cdp.isBaseOf(cd, &offset);
assert(offset != ClassDeclaration.OFFSET_RUNTIME);
//printf("%s to %s, offset = %d\n", cd.toChars(), cdp.toChars(), offset);
if (offset)
{
/* Bugzilla 7517: If fdp is declared in interface, offset the
* 'this' pointer to get correct interface type reference.
*/
Symbol *stmp = symbol_genauto(TYnptr);
ethis = el_bin(OPadd, TYnptr, el_var(irs.sthis), el_long(TYsize_t, offset));
ethis = el_bin(OPeq, TYnptr, el_var(stmp), ethis);
ethis = el_combine(ethis, el_ptr(stmp));
//elem_print(ethis);
}
else
ethis = el_ptr(irs.sthis);
}
else if (thisfd.hasNestedFrameRefs())
{
/* Local variables are referenced, can't skip.
* Address of 'sthis' gives the 'this' for the nested
* function.
*/
ethis = el_ptr(irs.sthis);
}
else
{
/* If no variables in the current function's frame are
* referenced by nested functions, then we can 'skip'
* adding this frame into the linked list of stack
* frames.
*/
ethis = el_var(irs.sthis);
}
}
else
{
/* No 'this' pointer for current function,
*/
if (thisfd.hasNestedFrameRefs())
{
/* OPframeptr is an operator that gets the frame pointer
* for the current function, i.e. for the x86 it gets
* the value of EBP
*/
ethis = el_long(TYnptr, 0);
ethis.Eoper = OPframeptr;
}
else
{
/* Use null if no references to the current function's frame
*/
ethis = el_long(TYnptr, 0);
}
}
}
else
{
if (!irs.sthis) // if no frame pointer for this function
{
fd.error(loc, "is a nested function and cannot be accessed from %s", irs.getFunc().toPrettyChars());
return el_long(TYnptr, 0); // error recovery
}
/* Go up a nesting level, i.e. we need to find the 'this'
* of an enclosing function.
* Our 'enclosing function' may also be an inner class.
*/
ethis = el_var(irs.sthis);
Dsymbol s = thisfd;
while (fd != s)
{
FuncDeclaration fdp2 = s.toParent2().isFuncDeclaration();
//printf("\ts = '%s'\n", s.toChars());
thisfd = s.isFuncDeclaration();
if (thisfd)
{
/* Enclosing function is a function.
*/
// Error should have been caught by front end
assert(thisfd.isNested() || thisfd.vthis);
}
else
{
/* Enclosed by an aggregate. That means the current
* function must be a member function of that aggregate.
*/
AggregateDeclaration ad = s.isAggregateDeclaration();
if (!ad)
{
Lnoframe:
irs.getFunc().error(loc, "cannot get frame pointer to %s", fd.toPrettyChars());
return el_long(TYnptr, 0); // error recovery
}
ClassDeclaration cd = ad.isClassDeclaration();
ClassDeclaration cdx = fd.isClassDeclaration();
if (cd && cdx && cdx.isBaseOf(cd, null))
break;
StructDeclaration sd = ad.isStructDeclaration();
if (fd == sd)
break;
if (!ad.isNested() || !ad.vthis)
goto Lnoframe;
ethis = el_bin(OPadd, TYnptr, ethis, el_long(TYsize_t, ad.vthis.offset));
ethis = el_una(OPind, TYnptr, ethis);
}
if (fdparent == s.toParent2())
break;
/* Remember that frames for functions that have no
* nested references are skipped in the linked list
* of frames.
*/
if (fdp2 && fdp2.hasNestedFrameRefs())
ethis = el_una(OPind, TYnptr, ethis);
s = s.toParent2();
assert(s);
}
}
version (none)
{
printf("ethis:\n");
elem_print(ethis);
printf("\n");
}
return ethis;
}
/*************************
* Initialize the hidden aggregate member, vthis, with
* the context pointer.
* Returns:
* *(ey + ad.vthis.offset) = this;
*/
elem *setEthis(Loc loc, IRState *irs, elem *ey, AggregateDeclaration ad)
{
elem *ethis;
FuncDeclaration thisfd = irs.getFunc();
int offset = 0;
Dsymbol adp = ad.toParent2(); // class/func we're nested in
//printf("[%s] setEthis(ad = %s, adp = %s, thisfd = %s)\n", loc.toChars(), ad.toChars(), adp.toChars(), thisfd.toChars());
if (adp == thisfd)
{
ethis = getEthis(loc, irs, ad);
}
else if (thisfd.vthis &&
(adp == thisfd.toParent2() ||
(adp.isClassDeclaration() &&
adp.isClassDeclaration().isBaseOf(thisfd.toParent2().isClassDeclaration(), &offset)
)
)
)
{
/* Class we're new'ing is at the same level as thisfd
*/
assert(offset == 0); // BUG: should handle this case
ethis = el_var(irs.sthis);
}
else
{
ethis = getEthis(loc, irs, adp);
FuncDeclaration fdp = adp.isFuncDeclaration();
if (fdp && fdp.hasNestedFrameRefs())
ethis = el_una(OPaddr, TYnptr, ethis);
}
ey = el_bin(OPadd, TYnptr, ey, el_long(TYsize_t, ad.vthis.offset));
ey = el_una(OPind, TYnptr, ey);
ey = el_bin(OPeq, TYnptr, ey, ethis);
return ey;
}
/*******************************************
* Convert intrinsic function to operator.
* Returns that operator, -1 if not an intrinsic function.
*/
int intrinsic_op(FuncDeclaration fd)
{
fd = fd.toAliasFunc();
const char *name = mangleExact(fd);
//printf("intrinsic_op(%s)\n", name);
__gshared immutable char*[11] std_namearray =
[
/* The names are mangled differently because of the pure and
* nothrow attributes.
*/
"4math3cosFNaNbNiNfeZe",
"4math3sinFNaNbNiNfeZe",
"4math4fabsFNaNbNiNfeZe",
"4math4rintFNaNbNiNfeZe",
"4math4sqrtFNaNbNiNfdZd",
"4math4sqrtFNaNbNiNfeZe",
"4math4sqrtFNaNbNiNffZf",
"4math4yl2xFNaNbNiNfeeZe",
"4math5ldexpFNaNbNiNfeiZe",
"4math6rndtolFNaNbNiNfeZl",
"4math6yl2xp1FNaNbNiNfeeZe",
];
__gshared immutable char*[11] std_namearray64 =
[
/* The names are mangled differently because of the pure and
* nothrow attributes.
*/
"4math3cosFNaNbNiNfeZe",
"4math3sinFNaNbNiNfeZe",
"4math4fabsFNaNbNiNfeZe",
"4math4rintFNaNbNiNfeZe",
"4math4sqrtFNaNbNiNfdZd",
"4math4sqrtFNaNbNiNfeZe",
"4math4sqrtFNaNbNiNffZf",
"4math4yl2xFNaNbNiNfeeZe",
"4math5ldexpFNaNbNiNfeiZe",
"4math6rndtolFNaNbNiNfeZl",
"4math6yl2xp1FNaNbNiNfeeZe",
];
__gshared immutable ubyte[11] std_ioptab =
[
OPcos,
OPsin,
OPabs,
OPrint,
OPsqrt,
OPsqrt,
OPsqrt,
OPyl2x,
OPscale,
OPrndtol,
OPyl2xp1,
];
__gshared immutable char*[46] core_namearray =
[
"4math3cosFNaNbNiNfeZe",
"4math3sinFNaNbNiNfeZe",
"4math4fabsFNaNbNiNfeZe",
"4math4rintFNaNbNiNfeZe",
"4math4sqrtFNaNbNiNfdZd",
"4math4sqrtFNaNbNiNfeZe",
"4math4sqrtFNaNbNiNffZf",
"4math4yl2xFNaNbNiNfeeZe",
"4math5ldexpFNaNbNiNfeiZe",
"4math6rndtolFNaNbNiNfeZl",
"4math6yl2xp1FNaNbNiNfeeZe",
"4simd10__prefetchFNaNbNiNfxPvhZv",
"4simd10__simd_stoFNaNbNiNfE4core4simd3XMMNhG16vNhG16vZNhG16v",
"4simd10__simd_stoFNaNbNiNfE4core4simd3XMMdNhG16vZNhG16v",
"4simd10__simd_stoFNaNbNiNfE4core4simd3XMMfNhG16vZNhG16v",
"4simd6__simdFNaNbNiNfE4core4simd3XMMNhG16vNhG16vZNhG16v",
"4simd6__simdFNaNbNiNfE4core4simd3XMMNhG16vNhG16vhZNhG16v",
"4simd6__simdFNaNbNiNfE4core4simd3XMMNhG16vZNhG16v",
"4simd6__simdFNaNbNiNfE4core4simd3XMMdZNhG16v",
"4simd6__simdFNaNbNiNfE4core4simd3XMMfZNhG16v",
"4simd9__simd_ibFNaNbNiNfE4core4simd3XMMNhG16vhZNhG16v",
"5bitop12volatileLoadFNbNiNfPhZh",
"5bitop12volatileLoadFNbNiNfPkZk",
"5bitop12volatileLoadFNbNiNfPmZm",
"5bitop12volatileLoadFNbNiNfPtZt",
"5bitop13volatileStoreFNbNiNfPhhZv",
"5bitop13volatileStoreFNbNiNfPkkZv",
"5bitop13volatileStoreFNbNiNfPmmZv",
"5bitop13volatileStoreFNbNiNfPttZv",
"5bitop3bsfFNaNbNiNfkZi",
"5bitop3bsfFNaNbNiNfmZi",
"5bitop3bsrFNaNbNiNfkZi",
"5bitop3bsrFNaNbNiNfmZi",
"5bitop3btcFNaNbNiPkkZi",
"5bitop3btrFNaNbNiPkkZi",
"5bitop3btsFNaNbNiPkkZi",
"5bitop3inpFNbNikZh",
"5bitop4inplFNbNikZk",
"5bitop4inpwFNbNikZt",
"5bitop4outpFNbNikhZh",
"5bitop5bswapFNaNbNiNfkZk",
"5bitop5outplFNbNikkZk",
"5bitop5outpwFNbNiktZt",
"5bitop7_popcntFNaNbNiNfkZi",
"5bitop7_popcntFNaNbNiNfmxx", // don't find 64 bit version in 32 bit code
"5bitop7_popcntFNaNbNiNftZt",
];
__gshared immutable char*[46] core_namearray64 =
[
"4math3cosFNaNbNiNfeZe",
"4math3sinFNaNbNiNfeZe",
"4math4fabsFNaNbNiNfeZe",
"4math4rintFNaNbNiNfeZe",
"4math4sqrtFNaNbNiNfdZd",
"4math4sqrtFNaNbNiNfeZe",
"4math4sqrtFNaNbNiNffZf",
"4math4yl2xFNaNbNiNfeeZe",
"4math5ldexpFNaNbNiNfeiZe",
"4math6rndtolFNaNbNiNfeZl",
"4math6yl2xp1FNaNbNiNfeeZe",
"4simd10__prefetchFNaNbNiNfxPvhZv",
"4simd10__simd_stoFNaNbNiNfE4core4simd3XMMNhG16vNhG16vZNhG16v",
"4simd10__simd_stoFNaNbNiNfE4core4simd3XMMdNhG16vZNhG16v",
"4simd10__simd_stoFNaNbNiNfE4core4simd3XMMfNhG16vZNhG16v",
"4simd6__simdFNaNbNiNfE4core4simd3XMMNhG16vNhG16vZNhG16v",
"4simd6__simdFNaNbNiNfE4core4simd3XMMNhG16vNhG16vhZNhG16v",
"4simd6__simdFNaNbNiNfE4core4simd3XMMNhG16vZNhG16v",
"4simd6__simdFNaNbNiNfE4core4simd3XMMdZNhG16v",
"4simd6__simdFNaNbNiNfE4core4simd3XMMfZNhG16v",
"4simd9__simd_ibFNaNbNiNfE4core4simd3XMMNhG16vhZNhG16v",
"5bitop12volatileLoadFNbNiNfPhZh",
"5bitop12volatileLoadFNbNiNfPkZk",
"5bitop12volatileLoadFNbNiNfPmZm",
"5bitop12volatileLoadFNbNiNfPtZt",
"5bitop13volatileStoreFNbNiNfPhhZv",
"5bitop13volatileStoreFNbNiNfPkkZv",
"5bitop13volatileStoreFNbNiNfPmmZv",
"5bitop13volatileStoreFNbNiNfPttZv",
"5bitop3bsfFNaNbNiNfkZi",
"5bitop3bsfFNaNbNiNfmZi",
"5bitop3bsrFNaNbNiNfkZi",
"5bitop3bsrFNaNbNiNfmZi",
"5bitop3btcFNaNbNiPmmZi",
"5bitop3btrFNaNbNiPmmZi",
"5bitop3btsFNaNbNiPmmZi",
"5bitop3inpFNbNikZh",
"5bitop4inplFNbNikZk",
"5bitop4inpwFNbNikZt",
"5bitop4outpFNbNikhZh",
"5bitop5bswapFNaNbNiNfkZk",
"5bitop5outplFNbNikkZk",
"5bitop5outpwFNbNiktZt",
"5bitop7_popcntFNaNbNiNfkZi",
"5bitop7_popcntFNaNbNiNfmZi",
"5bitop7_popcntFNaNbNiNftZt",
];
__gshared immutable ubyte[46] core_ioptab =
[
OPcos,
OPsin,
OPabs,
OPrint,
OPsqrt,
OPsqrt,
OPsqrt,
OPyl2x,
OPscale,
OPrndtol,
OPyl2xp1,
OPprefetch,
OPvector,
OPvector,
OPvector,
OPvector,
OPvector,
OPvector,
OPvector,
OPvector,
OPvector,
OPind,
OPind,
OPind,
OPind,
OPeq,
OPeq,
OPeq,
OPeq,
OPbsf,
OPbsf,
OPbsr,
OPbsr,
OPbtc,
OPbtr,
OPbts,
OPinp,
OPinp,
OPinp,
OPoutp,
OPbswap,
OPoutp,
OPoutp,
OPpopcnt,
OPpopcnt,
OPpopcnt,
];
static assert(std_namearray.length == std_namearray64.length);
static assert(std_namearray.length == std_ioptab.length);
static assert(core_namearray.length == core_namearray64.length);
static assert(core_namearray.length == core_ioptab.length);
debug
{
for (size_t i = 0; i < std_namearray.length - 1; i++)
{
if (strcmp(std_namearray[i], std_namearray[i + 1]) >= 0)
{
printf("std_namearray[%ld] = '%s'\n", cast(long)i, std_namearray[i]);
assert(0);
}
}
for (size_t i = 0; i < std_namearray64.length - 1; i++)
{
if (strcmp(std_namearray64[i], std_namearray64[i + 1]) >= 0)
{
printf("std_namearray64[%ld] = '%s'\n", cast(long)i, std_namearray64[i]);
assert(0);
}
}
for (size_t i = 0; i < core_namearray.length - 1; i++)
{
//printf("test1 %s %s %d\n", core_namearray[i], core_namearray[i + 1], strcmp(core_namearray[i], core_namearray[i + 1]));
if (strcmp(core_namearray[i], core_namearray[i + 1]) >= 0)
{
printf("core_namearray[%ld] = '%s'\n", cast(long)i, core_namearray[i]);
assert(0);
}
}
for (size_t i = 0; i < core_namearray64.length - 1; i++)
{
if (strcmp(core_namearray64[i], core_namearray64[i + 1]) >= 0)
{
printf("core_namearray64[%ld] = '%s'\n", cast(long)i, core_namearray64[i]);
assert(0);
}
}
}
size_t length = strlen(name);
if (length > 10 &&
(name[7] == 'm' || name[7] == 'i') &&
!memcmp(name, "_D3std".ptr, 6))
{
int i = binary(name + 6,
cast(const(char)**)(global.params.is64bit ? std_namearray64.ptr : std_namearray.ptr),
cast(int)std_namearray.length);
return (i == -1) ? i : std_ioptab[i];
}
if (length > 12 &&
(name[8] == 'm' || name[8] == 'b' || name[8] == 's') &&
!memcmp(name, "_D4core".ptr, 7))
{
int i = binary(name + 7,
cast(const(char)**)(global.params.is64bit ? core_namearray64.ptr : core_namearray.ptr),
cast(int)core_namearray.length);
if (i != -1)
{
int op = core_ioptab[i];
if (!global.params.is64bit &&
(op == OPbsf || op == OPbsr) &&
op == core_ioptab[i - 1])
{
// Don't recognize 64 bit bsf() / bsr() in 32 bit mode
op = -1;
}
return op;
}
if (global.params.is64bit &&
fd.toParent().isTemplateInstance() &&
fd.ident == Id.va_start)
{
OutBuffer buf;
mangleToBuffer(fd.getModule(), &buf);
const s = buf.peekString();
if (!strcmp(s, "4core4stdc6stdarg"))
{
return OPva_start;
}
}
return -1;
}
return -1;
}
/**************************************
* Given an expression e that is an array,
* determine and set the 'length' variable.
* Input:
* lengthVar Symbol of 'length' variable
* &e expression that is the array
* t1 Type of the array
* Output:
* e is rewritten to avoid side effects
* Returns:
* expression that initializes 'length'
*/
elem *resolveLengthVar(VarDeclaration lengthVar, elem **pe, Type t1)
{
//printf("resolveLengthVar()\n");
elem *einit = null;
if (lengthVar && !(lengthVar.storage_class & STCconst))
{
elem *elength;
Symbol *slength;
if (t1.ty == Tsarray)
{
TypeSArray tsa = cast(TypeSArray)t1;
dinteger_t length = tsa.dim.toInteger();
elength = el_long(TYsize_t, length);
goto L3;
}
else if (t1.ty == Tarray)
{
elength = *pe;
*pe = el_same(&elength);
elength = el_una(global.params.is64bit ? OP128_64 : OP64_32, TYsize_t, elength);
L3:
slength = toSymbol(lengthVar);
//symbol_add(slength);
einit = el_bin(OPeq, TYsize_t, el_var(slength), elength);
}
}
return einit;
}
void setClosureVarOffset(FuncDeclaration fd)
{
if (fd.needsClosure())
{
uint offset = Target.ptrsize; // leave room for previous sthis
for (size_t i = 0; i < fd.closureVars.dim; i++)
{
VarDeclaration v = fd.closureVars[i];
/* Align and allocate space for v in the closure
* just like AggregateDeclaration.addField() does.
*/
uint memsize;
uint memalignsize;
structalign_t xalign;
if (v.storage_class & STClazy)
{
/* Lazy variables are really delegates,
* so give same answers that TypeDelegate would
*/
memsize = Target.ptrsize * 2;
memalignsize = memsize;
xalign = STRUCTALIGN_DEFAULT;
}
else if (v.storage_class & (STCout | STCref))
{
// reference parameters are just pointers
memsize = Target.ptrsize;
memalignsize = memsize;
xalign = STRUCTALIGN_DEFAULT;
}
else
{
memsize = cast(uint)v.type.size();
memalignsize = v.type.alignsize();
xalign = v.alignment;
}
AggregateDeclaration.alignmember(xalign, memalignsize, &offset);
v.offset = offset;
//printf("closure var %s, offset = %d\n", v.toChars(), v.offset);
offset += memsize;
/* Can't do nrvo if the variable is put in a closure, since
* what the shidden points to may no longer exist.
*/
if (fd.nrvo_can && fd.nrvo_var == v)
{
fd.nrvo_can = 0;
}
}
}
}
/*************************************
* Closures are implemented by taking the local variables that
* need to survive the scope of the function, and copying them
* into a gc allocated chuck of memory. That chunk, called the
* closure here, is inserted into the linked list of stack
* frames instead of the usual stack frame.
*
* buildClosure() inserts code just after the function prolog
* is complete. It allocates memory for the closure, allocates
* a local variable (sclosure) to point to it, inserts into it
* the link to the enclosing frame, and copies into it the parameters
* that are referred to in nested functions.
* In VarExp::toElem and SymOffExp::toElem, when referring to a
* variable that is in a closure, takes the offset from sclosure rather
* than from the frame pointer.
*
* getEthis() and NewExp::toElem need to use sclosure, if set, rather
* than the current frame pointer.
*/
void buildClosure(FuncDeclaration fd, IRState *irs)
{
//printf("buildClosure(fd = %s)\n", fd.toChars());
if (fd.needsClosure())
{
setClosureVarOffset(fd);
// Generate closure on the heap
// BUG: doesn't capture variadic arguments passed to this function
/* BUG: doesn't handle destructors for the local variables.
* The way to do it is to make the closure variables the fields
* of a class object:
* class Closure {
* vtbl[]
* monitor
* ptr to destructor
* sthis
* ... closure variables ...
* ~this() { call destructor }
* }
*/
//printf("FuncDeclaration.buildClosure() %s\n", fd.toChars());
/* Generate type name for closure struct */
const char *name1 = "CLOSURE.";
const char *name2 = fd.toPrettyChars();
size_t namesize = strlen(name1)+strlen(name2)+1;
char *closname = cast(char *) calloc(namesize, char.sizeof);
strcat(strcat(closname, name1), name2);
/* Build type for closure */
type *Closstru = type_struct_class(closname, Target.ptrsize, 0, null, null, false, false, true);
free(closname);
symbol_struct_addField(Closstru.Ttag, "__chain", Type_toCtype(Type.tvoidptr), 0);
Symbol *sclosure;
sclosure = symbol_name("__closptr", SCauto, type_pointer(Closstru));
sclosure.Sflags |= SFLtrue | SFLfree;
symbol_add(sclosure);
irs.sclosure = sclosure;
assert(fd.closureVars.dim);
assert(fd.closureVars[0].offset >= Target.ptrsize);
for (size_t i = 0; i < fd.closureVars.dim; i++)
{
VarDeclaration v = fd.closureVars[i];
//printf("closure var %s\n", v.toChars());
// Hack for the case fail_compilation/fail10666.d,
// until proper issue 5730 fix will come.
bool isScopeDtorParam = v.edtor && (v.storage_class & STCparameter);
if (v.needsScopeDtor() || isScopeDtorParam)
{
/* Because the value needs to survive the end of the scope!
*/
v.error("has scoped destruction, cannot build closure");
}
if (v.isargptr)
{
/* See Bugzilla 2479
* This is actually a bug, but better to produce a nice
* message at compile time rather than memory corruption at runtime
*/
v.error("cannot reference variadic arguments from closure");
}
/* Set Sscope to closure */
Symbol *vsym = toSymbol(v);
assert(vsym.Sscope == null);
vsym.Sscope = sclosure;
/* Add variable as closure type member */
symbol_struct_addField(Closstru.Ttag, &vsym.Sident[0], vsym.Stype, v.offset);
//printf("closure field %s: memalignsize: %i, offset: %i\n", &vsym.Sident[0], memalignsize, v.offset);
}
// Calculate the size of the closure
VarDeclaration vlast = fd.closureVars[fd.closureVars.dim - 1];
uint structsize;
if (vlast.storage_class & STClazy)
structsize = vlast.offset + Target.ptrsize * 2;
else if (vlast.isRef() || vlast.isOut())
structsize = vlast.offset + Target.ptrsize;
else
structsize = cast(uint)(vlast.offset + vlast.type.size());
//printf("structsize = %d\n", structsize);
Closstru.Ttag.Sstruct.Sstructsize = structsize;
// Allocate memory for the closure
elem *e = el_long(TYsize_t, structsize);
e = el_bin(OPcall, TYnptr, el_var(getRtlsym(RTLSYM_ALLOCMEMORY)), e);
toTraceGC(irs, e, &fd.loc);
// Assign block of memory to sclosure
// sclosure = allocmemory(sz);
e = el_bin(OPeq, TYvoid, el_var(sclosure), e);
// Set the first element to sthis
// *(sclosure + 0) = sthis;
elem *ethis;
if (irs.sthis)
ethis = el_var(irs.sthis);
else
ethis = el_long(TYnptr, 0);
elem *ex = el_una(OPind, TYnptr, el_var(sclosure));
ex = el_bin(OPeq, TYnptr, ex, ethis);
e = el_combine(e, ex);
// Copy function parameters into closure
for (size_t i = 0; i < fd.closureVars.dim; i++)
{
VarDeclaration v = fd.closureVars[i];
if (!v.isParameter())
continue;
tym_t tym = totym(v.type);
bool win64ref = ISWIN64REF(v);
if (win64ref)
{
if (v.storage_class & STClazy)
tym = TYdelegate;
}
else if (ISREF(v, null))
tym = TYnptr; // reference parameters are just pointers
else if (v.storage_class & STClazy)
tym = TYdelegate;
ex = el_bin(OPadd, TYnptr, el_var(sclosure), el_long(TYsize_t, v.offset));
ex = el_una(OPind, tym, ex);
elem *ev = el_var(toSymbol(v));
if (win64ref)
{
ev.Ety = TYnptr;
ev = el_una(OPind, tym, ev);
if (tybasic(ev.Ety) == TYstruct || tybasic(ev.Ety) == TYarray)
ev.ET = Type_toCtype(v.type);
}
if (tybasic(ex.Ety) == TYstruct || tybasic(ex.Ety) == TYarray)
{
.type *t = Type_toCtype(v.type);
ex.ET = t;
ex = el_bin(OPstreq, tym, ex, ev);
ex.ET = t;
}
else
ex = el_bin(OPeq, tym, ex, ev);
e = el_combine(e, ex);
}
block_appendexp(irs.blx.curblock, e);
}
}
/***************************
* Determine return style of function - whether in registers or
* through a hidden pointer to the caller's stack.
*/
RET retStyle(TypeFunction tf)
{
//printf("TypeFunction.retStyle() %s\n", toChars());
if (tf.isref)
{
//printf(" ref RETregs\n");
return RETregs; // returns a pointer
}
Type tn = tf.next.toBasetype();
//printf("tn = %s\n", tn.toChars());
d_uns64 sz = tn.size();
Type tns = tn;
if (global.params.isWindows && global.params.is64bit)
{
// http://msdn.microsoft.com/en-us/library/7572ztz4.aspx
if (tns.ty == Tcomplex32)
return RETstack;
if (tns.isscalar())
return RETregs;
tns = tns.baseElemOf();
if (tns.ty == Tstruct)
{
StructDeclaration sd = (cast(TypeStruct)tns).sym;
if (sd.ident == Id.__c_long_double)
return RETregs;
if (!sd.isPOD() || sz > 8)
return RETstack;
if (sd.fields.dim == 0)
return RETstack;
}
if (sz <= 16 && !(sz & (sz - 1)))
return RETregs;
return RETstack;
}
else if (global.params.isWindows && global.params.mscoff)
{
Type tb = tns.baseElemOf();
if (tb.ty == Tstruct)
{
StructDeclaration sd = (cast(TypeStruct)tb).sym;
if (sd.ident == Id.__c_long_double)
return RETregs;
}
}
Lagain:
if (tns.ty == Tsarray)
{
tns = tns.baseElemOf();
if (tns.ty != Tstruct)
{
L2:
if (global.params.isLinux && tf.linkage != LINKd && !global.params.is64bit)
{
// 32 bit C/C++ structs always on stack
}
else
{
switch (sz)