/
s2ir.d
1768 lines (1502 loc) · 56.3 KB
/
s2ir.d
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/**
* Convert statements to Intermediate Representation (IR) for the back-end.
*
* 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/tocsym.d, _s2ir.d)
* Documentation: $(LINK https://dlang.org/phobos/dmd_s2ir.html)
* Coverage: $(LINK https://codecov.io/gh/dlang/dmd/src/master/src/dmd/s2ir.d)
*/
module dmd.s2ir;
import core.stdc.stdio;
import core.stdc.string;
import core.stdc.stddef;
import core.stdc.stdlib;
import core.stdc.time;
import dmd.root.array;
import dmd.root.rmem;
import dmd.rootobject;
import dmd.aggregate;
import dmd.astenums;
import dmd.dclass;
import dmd.declaration;
import dmd.denum;
import dmd.dmdparams;
import dmd.dmodule;
import dmd.dsymbol;
import dmd.dstruct;
import dmd.dtemplate;
import dmd.e2ir;
import dmd.expression;
import dmd.func;
import dmd.glue;
import dmd.id;
import dmd.init;
import dmd.location;
import dmd.mtype;
import dmd.statement;
import dmd.stmtstate;
import dmd.target;
import dmd.toctype;
import dmd.tocsym;
import dmd.toir;
import dmd.tokens;
import dmd.typesem : pointerTo;
import dmd.visitor;
import dmd.backend.barray;
import dmd.backend.cc;
import dmd.backend.cdef;
import dmd.backend.cgcv;
import dmd.backend.code;
import dmd.backend.code_x86;
import dmd.backend.cv4;
import dmd.backend.dlist;
import dmd.backend.dt;
import dmd.backend.el;
import dmd.backend.global;
import dmd.backend.obj;
import dmd.backend.oper;
import dmd.backend.rtlsym;
import dmd.backend.symtab;
import dmd.backend.ty;
import dmd.backend.type;
alias StmtState = dmd.stmtstate.StmtState!block;
void elem_setLoc(elem *e, const ref Loc loc) nothrow
{
srcpos_setLoc(e.Esrcpos, loc);
}
void Statement_toIR(Statement s, ref IRState irs)
{
/* Generate a block for each label
*/
FuncDeclaration fd = irs.getFunc();
if (auto labtab = fd.labtab)
foreach (keyValue; labtab.tab.asRange)
{
//printf(" KV: %s = %s\n", keyValue.key.toChars(), keyValue.value.toChars());
LabelDsymbol label = cast(LabelDsymbol)keyValue.value;
if (label.statement)
label.statement.extra = dmd.backend.global.block_calloc();
}
StmtState stmtstate;
Statement_toIR(s, irs, &stmtstate);
}
void Statement_toIR(Statement s, ref IRState irs, StmtState* stmtstate)
{
/****************************************
* This should be overridden by each statement class.
*/
void visitDefaultCase(Statement s)
{
irs.eSink.error(s.loc, "visitDefaultCase() %d for %s\n", s.stmt, s.toChars());
assert(0);
}
/*************************************
*/
void visitScopeGuard(ScopeGuardStatement s)
{
}
/****************************************
*/
void visitIf(IfStatement s)
{
elem *e;
Blockx *blx = irs.blx;
//printf("IfStatement.toIR('%s')\n", s.condition.toChars());
StmtState mystate = StmtState(stmtstate, s);
// bexit is the block that gets control after this IfStatement is done
block *bexit = mystate.breakBlock ? mystate.breakBlock : dmd.backend.global.block_calloc();
incUsage(irs, s.loc);
e = toElemDtor(s.condition, irs);
block_appendexp(blx.curblock, e);
block *bcond = blx.curblock;
block_next(blx, BCiftrue, null);
bcond.appendSucc(blx.curblock);
if (s.ifbody)
{
if (!s.isIfCtfeBlock()) // __ctfe is always false at runtime
Statement_toIR(s.ifbody, irs, &mystate);
}
blx.curblock.appendSucc(bexit);
if (s.elsebody)
{
block_next(blx, BCgoto, null);
bcond.appendSucc(blx.curblock);
Statement_toIR(s.elsebody, irs, &mystate);
blx.curblock.appendSucc(bexit);
}
else
bcond.appendSucc(bexit);
block_next(blx, BCgoto, bexit);
}
/**************************************
*/
void visitPragma(PragmaStatement s)
{
//printf("PragmaStatement.toIR()\n");
if (s.ident == Id.startaddress)
{
assert(s.args && s.args.length == 1);
Expression e = (*s.args)[0];
Dsymbol sa = getDsymbol(e);
FuncDeclaration f = sa.isFuncDeclaration();
assert(f);
Symbol *sym = toSymbol(f);
irs.startaddress = sym;
}
}
/******************************************
*/
void visitDo(DoStatement s)
{
Blockx *blx = irs.blx;
StmtState mystate = StmtState(stmtstate, s);
mystate.breakBlock = block_calloc(blx);
mystate.contBlock = block_calloc(blx);
block *bpre = blx.curblock;
block_next(blx, BCgoto, null);
bpre.appendSucc(blx.curblock);
mystate.contBlock.appendSucc(blx.curblock);
mystate.contBlock.appendSucc(mystate.breakBlock);
if (s._body)
Statement_toIR(s._body, irs, &mystate);
blx.curblock.appendSucc(mystate.contBlock);
block_next(blx, BCgoto, mystate.contBlock);
incUsage(irs, s.condition.loc);
block_appendexp(mystate.contBlock, toElemDtor(s.condition, irs));
block_next(blx, BCiftrue, mystate.breakBlock);
}
/*****************************************
*/
void visitFor(ForStatement s)
{
//printf("visit(ForStatement)) %u..%u\n", s.loc.linnum, s.endloc.linnum);
Blockx *blx = irs.blx;
StmtState mystate = StmtState(stmtstate, s);
mystate.breakBlock = block_calloc(blx);
mystate.contBlock = block_calloc(blx);
if (s._init)
Statement_toIR(s._init, irs, &mystate);
block *bpre = blx.curblock;
block_next(blx,BCgoto,null);
block *bcond = blx.curblock;
bpre.appendSucc(bcond);
mystate.contBlock.appendSucc(bcond);
if (s.condition)
{
incUsage(irs, s.condition.loc);
block_appendexp(bcond, toElemDtor(s.condition, irs));
block_next(blx,BCiftrue,null);
bcond.appendSucc(blx.curblock);
bcond.appendSucc(mystate.breakBlock);
}
else
{ /* No conditional, it's a straight goto
*/
block_next(blx,BCgoto,null);
bcond.appendSucc(blx.curblock);
}
if (s._body)
Statement_toIR(s._body, irs, &mystate);
/* End of the body goes to the continue block
*/
blx.curblock.appendSucc(mystate.contBlock);
block_setLoc(blx.curblock, s.endloc);
block_next(blx, BCgoto, mystate.contBlock);
if (s.increment)
{
incUsage(irs, s.increment.loc);
block_appendexp(mystate.contBlock, toElemDtor(s.increment, irs));
}
/* The 'break' block follows the for statement.
*/
block_next(blx,BCgoto, mystate.breakBlock);
}
/****************************************
*/
void visitBreak(BreakStatement s)
{
block *bbreak;
block *b;
Blockx *blx = irs.blx;
bbreak = stmtstate.getBreakBlock(s.ident);
assert(bbreak);
b = blx.curblock;
incUsage(irs, s.loc);
// Adjust exception handler scope index if in different try blocks
if (b.Btry != bbreak.Btry)
{
//setScopeIndex(blx, b, bbreak.Btry ? bbreak.Btry.Bscope_index : -1);
}
/* Nothing more than a 'goto' to the current break destination
*/
b.appendSucc(bbreak);
block_setLoc(b, s.loc);
block_next(blx, BCgoto, null);
}
/************************************
*/
void visitContinue(ContinueStatement s)
{
block *bcont;
block *b;
Blockx *blx = irs.blx;
//printf("ContinueStatement.toIR() %p\n", this);
bcont = stmtstate.getContBlock(s.ident);
assert(bcont);
b = blx.curblock;
incUsage(irs, s.loc);
// Adjust exception handler scope index if in different try blocks
if (b.Btry != bcont.Btry)
{
//setScopeIndex(blx, b, bcont.Btry ? bcont.Btry.Bscope_index : -1);
}
/* Nothing more than a 'goto' to the current continue destination
*/
b.appendSucc(bcont);
block_setLoc(b, s.loc);
block_next(blx, BCgoto, null);
}
/**************************************
*/
void visitGoto(GotoStatement s)
{
Blockx *blx = irs.blx;
assert(s.label.statement);
assert(s.tf == s.label.statement.tf);
block* bdest = cast(block*)s.label.statement.extra;
block *b = blx.curblock;
incUsage(irs, s.loc);
b.appendSucc(bdest);
block_setLoc(b, s.loc);
block_next(blx,BCgoto,null);
}
void visitLabel(LabelStatement s)
{
//printf("LabelStatement.toIR() %p, statement: `%s`\n", this, s.statement.toChars());
Blockx *blx = irs.blx;
block *bc = blx.curblock;
StmtState mystate = StmtState(stmtstate, s);
mystate.ident = s.ident;
block* bdest = cast(block*)s.extra;
// At last, we know which try block this label is inside
bdest.Btry = blx.tryblock;
block_next(blx, BCgoto, bdest);
bc.appendSucc(blx.curblock);
if (s.statement)
Statement_toIR(s.statement, irs, &mystate);
}
/**************************************
*/
void visitSwitch(SwitchStatement s)
{
Blockx *blx = irs.blx;
//printf("SwitchStatement.toIR()\n");
StmtState mystate = StmtState(stmtstate, s);
mystate.switchBlock = blx.curblock;
/* Block for where "break" goes to
*/
mystate.breakBlock = block_calloc(blx);
/* Block for where "default" goes to.
* If there is a default statement, then that is where default goes.
* If not, then do:
* default: break;
* by making the default block the same as the break block.
*/
mystate.defaultBlock = s.sdefault ? block_calloc(blx) : mystate.breakBlock;
const numcases = s.cases ? s.cases.length : 0;
/* allocate a block for each case
*/
if (numcases)
foreach (cs; *s.cases)
{
cs.extra = cast(void*)block_calloc(blx);
}
incUsage(irs, s.loc);
elem *econd = toElemDtor(s.condition, irs);
if (s.hasVars)
{ /* Generate a sequence of if-then-else blocks for the cases.
*/
if (econd.Eoper != OPvar)
{
elem *e = exp2_copytotemp(econd);
block_appendexp(mystate.switchBlock, e);
econd = e.EV.E2;
}
if (numcases)
foreach (cs; *s.cases)
{
elem *ecase = toElemDtor(cs.exp, irs);
elem *e = el_bin(OPeqeq, TYbool, el_copytree(econd), ecase);
block *b = blx.curblock;
block_appendexp(b, e);
block* cb = cast(block*)cs.extra;
block_next(blx, BCiftrue, null);
b.appendSucc(cb);
b.appendSucc(blx.curblock);
}
/* The final 'else' clause goes to the default
*/
block *b = blx.curblock;
block_next(blx, BCgoto, null);
b.appendSucc(mystate.defaultBlock);
Statement_toIR(s._body, irs, &mystate);
/* Have the end of the switch body fall through to the block
* following the switch statement.
*/
block_goto(blx, BCgoto, mystate.breakBlock);
return;
}
if (s.condition.type.isString())
{
// This codepath was replaced by lowering during semantic
// to object.__switch in druntime.
assert(0);
}
block_appendexp(mystate.switchBlock, econd);
block_next(blx,BCswitch,null);
/* First successor is the default block
*/
mystate.switchBlock.appendSucc(mystate.defaultBlock);
if (numcases)
{
// Corresponding free is in block_free
alias TCase = typeof(mystate.switchBlock.Bswitch[0]);
auto pu = cast(TCase *)Mem.check(.malloc(TCase.sizeof * numcases));
mystate.switchBlock.Bswitch = pu[0 .. numcases];
/* Fill in the first entry for each pair, which is the case value.
* CaseStatement.toIR() will fill in
* the second entry for each pair with the block.
*/
foreach (i, cs; *s.cases)
mystate.switchBlock.Bswitch[i] = cs.exp.toInteger();
}
Statement_toIR(s._body, irs, &mystate);
/* Have the end of the switch body fall through to the block
* following the switch statement.
*/
block_goto(blx, BCgoto, mystate.breakBlock);
}
void visitCase(CaseStatement s)
{
Blockx *blx = irs.blx;
block *bcase = blx.curblock;
block* cb = cast(block*)s.extra;
block_next(blx, BCgoto, cb);
block *bsw = stmtstate.getSwitchBlock();
if (bsw.BC == BCswitch)
bsw.appendSucc(cb); // second entry in pair
bcase.appendSucc(cb);
if (!isAssertFalse(s.statement))
incUsage(irs, s.loc);
if (s.statement)
Statement_toIR(s.statement, irs, stmtstate);
}
void visitDefault(DefaultStatement s)
{
Blockx *blx = irs.blx;
block *bcase = blx.curblock;
block *bdefault = stmtstate.getDefaultBlock();
block_next(blx,BCgoto,bdefault);
bcase.appendSucc(blx.curblock);
if (!isAssertFalse(s.statement))
incUsage(irs, s.loc);
if (s.statement)
Statement_toIR(s.statement, irs, stmtstate);
}
void visitGotoDefault(GotoDefaultStatement s)
{
block *b;
Blockx *blx = irs.blx;
block *bdest = stmtstate.getDefaultBlock();
b = blx.curblock;
// The rest is equivalent to GotoStatement
b.appendSucc(bdest);
incUsage(irs, s.loc);
block_next(blx,BCgoto,null);
}
void visitGotoCase(GotoCaseStatement s)
{
Blockx *blx = irs.blx;
block *bdest = cast(block*)s.cs.extra;
block *b = blx.curblock;
// The rest is equivalent to GotoStatement
b.appendSucc(bdest);
incUsage(irs, s.loc);
block_next(blx,BCgoto,null);
}
void visitSwitchError(SwitchErrorStatement s)
{
// SwitchErrors are lowered to a CallExpression to object.__switch_error() in druntime
// We still need the call wrapped in SwitchErrorStatement to pass compiler error checks.
assert(s.exp !is null, "SwitchErrorStatement needs to have a valid Expression.");
Blockx *blx = irs.blx;
//printf("SwitchErrorStatement.toIR(), exp = %s\n", s.exp ? s.exp.toChars() : "");
incUsage(irs, s.loc);
block_appendexp(blx.curblock, toElemDtor(s.exp, irs));
}
/**************************************
*/
void visitReturn(ReturnStatement s)
{
//printf("s2ir.ReturnStatement: %s\n", s.toChars());
Blockx *blx = irs.blx;
BC bc;
incUsage(irs, s.loc);
if (s.exp)
{
elem *e;
FuncDeclaration func = irs.getFunc();
assert(func);
auto tf = func.type.isTypeFunction();
assert(tf);
RET retmethod = retStyle(tf, func.needThis());
if (retmethod == RET.stack)
{
elem *es;
bool writetohp;
/* If returning struct literal, write result
* directly into return value
*/
if (auto sle = s.exp.isStructLiteralExp())
{
sle.sym = irs.shidden;
writetohp = true;
}
/* Detect function call that returns the same struct
* and construct directly into *shidden
*/
else if (auto ce = s.exp.isCallExp())
{
if (ce.e1.op == EXP.variable || ce.e1.op == EXP.star)
{
Type t = ce.e1.type.toBasetype();
if (t.ty == Tdelegate)
t = t.nextOf();
if (t.ty == Tfunction && retStyle(cast(TypeFunction)t, ce.f && ce.f.needThis()) == RET.stack)
{
irs.ehidden = el_var(irs.shidden);
e = toElemDtor(s.exp, irs);
e = el_una(OPaddr, TYnptr, e);
goto L1;
}
}
else if (auto dve = ce.e1.isDotVarExp())
{
auto fd = dve.var.isFuncDeclaration();
if (fd && fd.isCtorDeclaration())
{
if (auto sle = dve.e1.isStructLiteralExp())
{
sle.sym = irs.shidden;
writetohp = true;
}
}
Type t = ce.e1.type.toBasetype();
if (t.ty == Tdelegate)
t = t.nextOf();
if (t.ty == Tfunction && retStyle(cast(TypeFunction)t, fd && fd.needThis()) == RET.stack)
{
irs.ehidden = el_var(irs.shidden);
e = toElemDtor(s.exp, irs);
e = el_una(OPaddr, TYnptr, e);
goto L1;
}
}
}
e = toElemDtor(s.exp, irs);
assert(e);
if (writetohp ||
(func.isNRVO() && func.nrvo_var))
{
// Return value via hidden pointer passed as parameter
// Write exp; return shidden;
es = e;
}
else
{
// Return value via hidden pointer passed as parameter
// Write *shidden=exp; return shidden;
es = el_una(OPind,e.Ety,el_var(irs.shidden));
es = elAssign(es, e, s.exp.type, null);
}
e = el_var(irs.shidden);
e = el_bin(OPcomma, e.Ety, es, e);
}
else if (tf.isref)
{
// Reference return, so convert to a pointer
e = toElemDtor(s.exp, irs);
/* already taken care of for vresult in buildResultVar() and semantic3.d
* https://issues.dlang.org/show_bug.cgi?id=19384
*/
if (func.vresult)
if (BlitExp be = s.exp.isBlitExp())
{
if (VarExp ve = be.e1.isVarExp())
{
if (ve.var == func.vresult)
goto Lskip;
}
}
e = addressElem(e, s.exp.type.pointerTo());
Lskip:
}
else
{
e = toElemDtor(s.exp, irs);
assert(e);
}
L1:
elem_setLoc(e, s.loc);
block_appendexp(blx.curblock, e);
bc = BCretexp;
// if (type_zeroCopy(Type_toCtype(s.exp.type)))
// bc = BCret;
}
else
bc = BCret;
block *finallyBlock;
if (config.ehmethod != EHmethod.EH_DWARF &&
!irs.isNothrow() &&
(finallyBlock = stmtstate.getFinallyBlock()) != null)
{
assert(finallyBlock.BC == BC_finally);
blx.curblock.appendSucc(finallyBlock);
}
block_next(blx, bc, null);
}
/**************************************
*/
void visitExp(ExpStatement s)
{
Blockx *blx = irs.blx;
//printf("ExpStatement.toIR(), exp: %p %s\n", s.exp, s.exp ? s.exp.toChars() : "");
if (s.exp)
{
if (s.exp.hasCode &&
!(isAssertFalse(s.exp))) // `assert(0)` not meant to be covered
incUsage(irs, s.loc);
block_appendexp(blx.curblock, toElemDtor(s.exp, irs));
// goto the next block
block* b = blx.curblock;
block_next(blx, BCgoto, null);
b.appendSucc(blx.curblock);
}
}
/**************************************
*/
void visitDtorExp(DtorExpStatement s)
{
return visitExp(s);
}
/**************************************
*/
void visitCompound(CompoundStatement s)
{
if (s.statements)
{
foreach (s2; *s.statements)
{
if (s2)
Statement_toIR(s2, irs, stmtstate);
}
}
}
/**************************************
*/
void visitCompoundAsm(CompoundAsmStatement s)
{
return visitCompound(s);
}
/**************************************
*/
void visitUnrolledLoop(UnrolledLoopStatement s)
{
Blockx *blx = irs.blx;
StmtState mystate = StmtState(stmtstate, s);
mystate.breakBlock = block_calloc(blx);
block *bpre = blx.curblock;
block_next(blx, BCgoto, null);
block *bdo = blx.curblock;
bpre.appendSucc(bdo);
block *bdox;
foreach (s2; *s.statements)
{
if (s2)
{
mystate.contBlock = block_calloc(blx);
Statement_toIR(s2, irs, &mystate);
bdox = blx.curblock;
block_next(blx, BCgoto, mystate.contBlock);
bdox.appendSucc(mystate.contBlock);
}
}
bdox = blx.curblock;
block_next(blx, BCgoto, mystate.breakBlock);
bdox.appendSucc(mystate.breakBlock);
}
/**************************************
*/
void visitScope(ScopeStatement s)
{
if (s.statement)
{
Blockx *blx = irs.blx;
StmtState mystate = StmtState(stmtstate, s);
if (mystate.prev.ident)
mystate.ident = mystate.prev.ident;
Statement_toIR(s.statement, irs, &mystate);
if (mystate.breakBlock)
block_goto(blx,BCgoto,mystate.breakBlock);
}
}
/***************************************
*/
void visitWith(WithStatement s)
{
//printf("WithStatement.toIR()\n");
if (s.exp.op == EXP.scope_ || s.exp.op == EXP.type)
{
}
else
{
// Declare with handle
auto sp = toSymbol(s.wthis);
symbol_add(sp);
// Perform initialization of with handle
auto ie = s.wthis._init.isExpInitializer();
assert(ie);
auto ei = toElemDtor(ie.exp, irs);
auto e = el_var(sp);
e = el_bin(OPeq,e.Ety, e, ei);
elem_setLoc(e, s.loc);
incUsage(irs, s.loc);
block_appendexp(irs.blx.curblock,e);
}
// Execute with block
if (s._body)
Statement_toIR(s._body, irs, stmtstate);
}
/***************************************
*/
void visitThrow(ThrowStatement s)
{
// throw(exp)
Blockx *blx = irs.blx;
incUsage(irs, s.loc);
elem *e = toElemDtor(s.exp, irs);
const rtlthrow = config.ehmethod == EHmethod.EH_DWARF ? RTLSYM.THROWDWARF : RTLSYM.THROWC;
e = el_bin(OPcall, TYvoid, el_var(getRtlsym(rtlthrow)),e);
block_appendexp(blx.curblock, e);
block_next(blx, BCexit, null); // throw never returns
}
/***************************************
* Builds the following:
* _try
* block
* jcatch
* handler
* A try-catch statement.
*/
void visitTryCatch(TryCatchStatement s)
{
Blockx *blx = irs.blx;
if (blx.funcsym.Sfunc.Fflags3 & Feh_none) printf("visit %s\n", blx.funcsym.Sident.ptr);
if (blx.funcsym.Sfunc.Fflags3 & Feh_none) assert(0);
if (config.ehmethod == EHmethod.EH_WIN32)
nteh_declarvars(blx);
StmtState mystate = StmtState(stmtstate, s);
block *tryblock = block_goto(blx,BCgoto,null);
int previndex = blx.scope_index;
tryblock.Blast_index = previndex;
blx.scope_index = tryblock.Bscope_index = blx.next_index++;
// Set the current scope index
setScopeIndex(blx,tryblock,tryblock.Bscope_index);
// This is the catch variable
tryblock.jcatchvar = symbol_genauto(type_fake(mTYvolatile | TYnptr));
blx.tryblock = tryblock;
block *breakblock = block_calloc(blx);
block_goto(blx,BC_try,null);
if (s._body)
{
Statement_toIR(s._body, irs, &mystate);
}
blx.tryblock = tryblock.Btry;
// break block goes here
block_goto(blx, BCgoto, breakblock);
setScopeIndex(blx,blx.curblock, previndex);
blx.scope_index = previndex;
// create new break block that follows all the catches
block *breakblock2 = block_calloc(blx);
blx.curblock.appendSucc(breakblock2);
block_next(blx,BCgoto,null);
assert(s.catches);
if (config.ehmethod == EHmethod.EH_DWARF)
{
/*
* BCjcatch:
* __hander = __RDX;
* __exception_object = __RAX;
* jcatchvar = *(__exception_object - target.ptrsize); // old way
* jcatchvar = __dmd_catch_begin(__exception_object); // new way
* switch (__handler)
* case 1: // first catch handler
* *(sclosure + cs.var.offset) = cs.var;
* ...handler body ...
* break;
* ...
* default:
* HALT
*/
// volatile so optimizer won't delete it
Symbol *seax = symbol_name("__EAX", SC.pseudo, type_fake(mTYvolatile | TYnptr));
seax.Sreglsw = 0; // EAX, RAX, whatevs
symbol_add(seax);
Symbol *sedx = symbol_name("__EDX", SC.pseudo, type_fake(mTYvolatile | TYint));
sedx.Sreglsw = 2; // EDX, RDX, whatevs
symbol_add(sedx);
Symbol *shandler = symbol_name("__handler", SC.auto_, tstypes[TYint]);
symbol_add(shandler);
Symbol *seo = symbol_name("__exception_object", SC.auto_, tspvoid);
symbol_add(seo);
elem *e1 = el_bin(OPeq, TYvoid, el_var(shandler), el_var(sedx)); // __handler = __RDX
elem *e2 = el_bin(OPeq, TYvoid, el_var(seo), el_var(seax)); // __exception_object = __RAX
version (none)
{
// jcatchvar = *(__exception_object - target.ptrsize)
elem *e = el_bin(OPmin, TYnptr, el_var(seo), el_long(TYsize_t, target.ptrsize));
elem *e3 = el_bin(OPeq, TYvoid, el_var(tryblock.jcatchvar), el_una(OPind, TYnptr, e));
}
else
{
// jcatchvar = __dmd_catch_begin(__exception_object);
elem *ebegin = el_var(getRtlsym(RTLSYM.BEGIN_CATCH));
elem *e = el_bin(OPcall, TYnptr, ebegin, el_var(seo));
elem *e3 = el_bin(OPeq, TYvoid, el_var(tryblock.jcatchvar), e);
}
block *bcatch = blx.curblock;
tryblock.appendSucc(bcatch);
block_goto(blx, BCjcatch, null);
block *defaultblock = block_calloc(blx);
block *bswitch = blx.curblock;
bswitch.Belem = el_combine(el_combine(e1, e2),
el_combine(e3, el_var(shandler)));
const numcases = s.catches.length;
if (numcases)
{
long* pu = cast(long*) Mem.check(.malloc(long.sizeof * numcases));
bswitch.Bswitch = pu[0 .. numcases];
}
bswitch.appendSucc(defaultblock);
block_next(blx, BCswitch, null);
foreach (i, cs; *s.catches)
{
bswitch.Bswitch[i] = i;
if (cs.var)
cs.var.csym = tryblock.jcatchvar;
assert(cs.type);
/* The catch type can be a C++ class or a D class.
* If a D class, insert a pointer to TypeInfo into the typesTable[].
* If a C++ class, insert a pointer to __cpp_type_info_ptr into the typesTable[].
*/
Type tcatch = cs.type.toBasetype();
ClassDeclaration cd = tcatch.isClassHandle();
bool isCPPclass = cd.isCPPclass();
Symbol *catchtype;
if (isCPPclass)
{
catchtype = toSymbolCpp(cd);
if (i == 0)
{
// rewrite ebegin to use __cxa_begin_catch
Symbol *s2 = getRtlsym(RTLSYM.CXA_BEGIN_CATCH);
ebegin.EV.Vsym = s2;
}
}
else
catchtype = toSymbol(tcatch);
/* Look for catchtype in typesTable[] using linear search,
* insert if not already there,
* log index in Action Table (i.e. switch case table)
*/
func_t *f = blx.funcsym.Sfunc;
foreach (j, ct; f.typesTable[])
{
if (ct == catchtype)
{
bswitch.Bswitch[i] = 1 + j; // index starts at 1
goto L1;
}
}
f.typesTable.push(catchtype);
bswitch.Bswitch[i] = f.typesTable.length; // index starts at 1
L1: