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|
import "ir.hff";
import "common.hff";
extern fn ir_genstatic(IR *IRCtx, decl *Decl) void {
}
struct InstStream;
struct InstStream {
IR *IRCtx,
head *IRInst,
tail *IRInst,
fn push(S *InstStream, inst *IRInst) void {
if S.tail {
S.tail.next = inst;
} else {
S.head = inst;
}
S.tail = inst;
}
fn mkinst(S *InstStream, inst0 IRInst, narg uint) *IRInst {
let inst *IRInst = S.IR.alloc->alloc(sizeof IRInst + (narg * sizeof IRArg), alignof IRInst);
*inst = inst0;
return inst;
}
fn mkinst1(S *InstStream, inst0 IRInst, a IRArg) *IRInst {
let inst = S->mkinst(inst0, 1);
inst.args[0] = a;
return inst;
}
fn mkinst2(S *InstStream, inst0 IRInst, a IRArg, b IRArg) *IRInst {
let inst = S->mkinst(inst0, 2);
inst.args[0] = a;
inst.args[1] = b;
return inst;
}
fn mkinst3(S *InstStream, inst0 IRInst, a IRArg, b IRArg, c IRArg) *IRInst {
let inst = S->mkinst(inst0, 3);
inst.args[0] = a;
inst.args[1] = b;
inst.args[2] = c;
return inst;
}
fn pushnop(S *InstStream) void {
S->push(S->mkinst({:nop}, 0));
}
}
fn genblock(S *InstStream, block [#]Stmt) void;
fn genexpr(S *InstStream, ex *Expr) IRValue {
static tmpid int = 0;
// fold(ex);
defmacro genunop(u,t) [ {
let child = genexpr(S, (u).ex);
let res = IRValue{ex.ty, .u: :Tmp(tmpid++)};
let inst = S->mkinst2({t}, :Val(res), :Val(child));
S->push(inst);
return res;
} ]
defmacro genbinop(b,t) [ {
let lhs = genexpr(S, (b).lhs);
let rhs = genexpr(S, (b).rhs);
let res = IRValue{ex.ty, .u: :Tmp(tmpid++)};
let inst = S->mkinst3({t}, :Val(res), :Val(lhs), :Val(rhs));
S->push(inst);
return res;
} ]
switch ex.u {
case IntLit i; return {ex.ty, :IImm(i.i)};
case FloLit f; return {ex.ty, :FImm(f)};
case StrLit s; return {ex.ty, :SImm(s)};
case BoolLit b; return {ex.ty, :BImm(b)};
case NullLit; return {ex.ty, :Null};
case UnOp u;
switch u.op {
case :neg; genunop(u, ex.ty->is(:Int) ? :neg : :fneg);
case :not; genunop(u, :not);
case :compl; genunop(u, :compl);
}
case BinOp b;
switch b.op {
case '+'; genbinop(b, !ex.ty->is(:Flo) ? :add : :fadd);
case '-'; genbinop(b, !ex.ty->is(:Flo) ? :sub : :fsub);
case '*'; genbinop(b, !ex.ty->is(:Flo) ? :mul : :fmul);
case '/'; genbinop(b, !ex.ty->is(:Flo) ? :div : :fdiv);
case '%'; genbinop(b, :mod);
case '&'; genbinop(b, :band);
case '|'; genbinop(b, :bor);
case '^'; genbinop(b, :xor);
case '<<'; genbinop(b, :lsl);
case '>>'; genbinop(b, ex.ty.u.Int.sgn ? :asr : :lsr);
case '=='; genbinop(b, :eq);
case '!='; genbinop(b, :neq);
case '<'; genbinop(b, :lt);
case '<='; genbinop(b, :lteq);
}
case Cond c;
let test = genexpr(S, c.test);
let beqz = S->mkinst1({:beqz}, :Val(test));
S->push(beqz);
let t = genexpr(S, c.t);
let res = IRValue{ex.ty, :Tmp(tmpid++)};
let inst = S->mkinst2({:copy}, :Val(res), :Val(t));
S->push(inst);
let b = S->mkinst({:b}, 0);
S->push(b);
S->pushnop();
beqz.branch = S.tail;
let f = genexpr(S, c.f);
let inst = S->mkinst2({:copy}, :Val(res), :Val(f));
S->push(inst);
S->pushnop();
b.branch = S.tail;
return res;
case Call c;
let n = c.args.#len;
let inst = S->mkinst({:call, .call_nargs: n}, n + 2);
inst.args[1] = :Fn(c.lhs.u.Symbol);
if c.lhs.u.#tag == :Symbol {
for let i = 0; i < n; ++i {
inst.args[i + 2] = :Val(genexpr(S, &c.args[i]));
}
S->push(inst);
} else {
}
let res = IRValue{ex.ty, :Tmp(tmpid++)};
inst.args[0] = :Val(res);
return res;
case Symbol decl;
if decl.u.#tag == :Let {
return {ex.ty, :Local(decl)};
} else {
return {ex.ty, :Global(decl)};
}
}
assert(#f, "NYI ex");
}
fn genstmt(S *InstStream, stmt *Stmt) void {
switch stmt.u {
case Block block;
genblock(S, block);
case Expr *ex;
genexpr(S, ex);
case If If;
let t = genexpr(S, &If.test);
let beqz = S->mkinst1({:beqz}, :Val(t));
S->push(beqz);
genblock(S, If.t);
if If.f.#ptr {
let b = S->mkinst({:b}, 0);
S->push(b);
S->pushnop();
beqz.branch = S.tail;
genblock(S, If.f);
S->pushnop();
b.branch = S.tail;
} else {
S->pushnop();
beqz.branch = S.tail;
}
case Return retex;
if retex->empty() {
S->push(S->mkinst({:ret0}, 0));
} else {
let inst = S->mkinst1({:ret}, :Val(genexpr(S, &retex.Some)));
S->push(inst);
}
case else
assert(#f, "NYI st");
}
}
fn genblock(S *InstStream, block [#]Stmt) void {
foreach_ptr(st, _, block) {
genstmt(S, st);
}
}
extern fn ir_genfn(IR *IRCtx, f *Fn) void {
let stream InstStream = {.IR: IR};
genblock(&stream, f.body.Some);
stream->push(stream->mkinst({:ret0}, 0));
efmt("----------------------\n");
efmt("function %s.%d:\n", container_of(f, Decl, u.Fn).name, f.id);
irdump(stream.head);
}
|
