Hojun-Cho
a917533fbf
struct params were passed GP-only, so a struct{f64,f64} argument landed in
DI/SI instead of X0/X1 — value-correct for internal ww calls (the bits
round-trip) but not SysV register-class conformant. Add a per-eightbyte
classifier (struct_float_class) routing a qualifying struct's float eightbytes
through the SSE arg cursor, reusing #163's dual-cursor plumbing and #164's
field classification. A struct qualifies only when every eightbyte is
pure-integer or a lone f64 exactly filling it (and >=1 f64); anything else —
any f32, multiple floats per eightbyte, a straddling or aggregate field —
falls back to the unchanged GP path (f32 sub-eightbyte packing deferred #165b).
Both stages' predicates are alias-aware and identical in coverage.
Gate-blind and value-correct either way, so the discriminator is the callee's
receive instruction (MOVSD vs MOVQ), scoped per-function — covered by probe
946.
564 lines
17 KiB
Plaintext
564 lines
17 KiB
Plaintext
// selfhost/cmd/wcc/cgendecl.ww — split out of cgen.ww.
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//
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// Houses the top-level emission glue:
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// - cgfnparams: parameter spilling per SysV
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// - cgfn: fn body emit (TEXT/SUBQ patched after body), prologue
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// deferred via cgen.ww's cgoutstate so the frame size
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// reflects every emit-time localadd (#15/#26c)
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// - cgfile: file-level entry (the exported driver)
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//
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// Bundler pulls this in transitively via cgen.ww; consumers don't
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// need to `use cgendecl;` directly.
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package wcc;
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import os;
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import ast;
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import tok;
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import typ;
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import sym;
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import strconv;
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// ---- function-level cgen ---------------------------------------------
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fn cgfnparams(c: *cgen, params: *node) void = {
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let p: *node = params;
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// sret (#23): RDI is consumed by the hidden dest pointer
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// (already spilled to @sretarg by cgfn); the first user param
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// lands in SI.
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let idx: i32 = 0;
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if (localfind(c, "@sretarg") != 0) { idx = 1; };
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let fidx: i32 = 0;
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// Cursor for args that overflow the SysV reg windows. Each
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// stack-passed arg lives at 16+8*k(BP) — no spill, the local
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// is registered with a *positive* offset pointing into the
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// caller's frame. Mirrors C cgen's cg_stack_arg_cursor.
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let stkcursor: i32 = 0;
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for (p != nil) {
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if (p.kind == nkind.N_PARAM) {
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let nm: str = p.str;
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// Hare-style variadic `T...`: callee receives a []T
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// slice (3 register words / 24B). p.lhs is already
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// the []T wrap installed by check.ww installparams
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// (mirrors cstage check.c:455 tp->type promotion), so
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// we consume it directly — re-wrapping via slicewrap
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// would yield [][]T.
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if (p.op == tkind.TK_ELLIPSIS) {
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let tn: *node = p.lhs;
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if (idx + 3 <= 6) {
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let off: i32 = localadd(c, nm, tyslicesize(): i32, tn);
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff(off: i64);
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emitline("(BP)\n");
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idx += 1;
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + 8): i64);
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emitline("(BP)\n");
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idx += 1;
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + 16): i64);
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emitline("(BP)\n");
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idx += 1;
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} else { if (idx < 6) {
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// Partial-fit stitch — variadic `T...` is a slice
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// at the ABI boundary (the call site synthesises a
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// 24B descriptor and pushes ptr/len/cap), so this
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// mirrors the slice branch at cgendecl.ww:518.
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let off: i32 = localadd(c, nm, tyslicesize(): i32, tn);
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let regs_left: i32 = 6 - idx;
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let w: i32 = 0;
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for (w < regs_left) {
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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idx += 1;
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w += 1;
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};
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for (w < 3) {
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emitline("\tMOVQ\t");
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emitoff((16 + stkcursor*8): i64);
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emitline("(BP), AX\n");
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emitline("\tMOVQ\tAX, ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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stkcursor += 1;
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w += 1;
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};
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} else {
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localaddstack(c, nm, tn, 16 + stkcursor*8);
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stkcursor += 3;
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};};
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p = p.next;
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continue;
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};
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if (p.lhs != nil) { if (p.lhs.kind == nkind.N_TTUPLE) {
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// #163: tuple PARAM receive (param twin of #164's
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// return). Walk the tuple's elements over the SysV
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// arg cursor — a float reads its XMM (X0..X7),
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// everything else an INTEGER arg reg (DI/SI/..); a
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// slice/str its 3-word {ptr,len,cap} — storing each
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// into the param slot positionally (eoff steps by
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// slotsize, matching the t.0/t.1 field-access walk +
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// the SEND). Reg overflow loud-stops (rule 7); the
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// partial-spill stitch is out of scope (twin of #164).
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let off: i32 = localadd(c, nm, slotsize(c, p.lhs), p.lhs);
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let eoff: i32 = 0;
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let te: *node = p.lhs.list;
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for (te != nil) {
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let et: *node = te.lhs;
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if (isfloattype(c, et)) {
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if (fidx >= 8) {
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let msg: str = "tuple param float element overflows SSE arg regs (X0..X7); stitch out of scope, see #163\n";
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os.write(2, msg.ptr, msg.len: u64);
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os.exit(1);
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};
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let mov: str = "MOVSD";
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if (isf32type(c, et)) { mov = "MOVSS"; };
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emitline("\t");
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emitline(mov);
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emitline("\t");
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emitline(fargregname(fidx));
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emitline(", ");
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emitoff((off + eoff): i64);
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emitline("(BP)\n");
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fidx += 1;
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} else {
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let wide: bool = isstrtype(c, et) || isslicetype(c, et);
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let eb: i32 = tupebytes(wide);
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if (idx + eb > 6) {
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let msg: str = "tuple param element overflows integer arg regs (DI/SI/DX/CX/R8/R9); stitch out of scope, see #163\n";
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os.write(2, msg.ptr, msg.len: u64);
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os.exit(1);
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};
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let k: i32 = 0;
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for (k < eb) {
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + eoff + k*8): i64);
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emitline("(BP)\n");
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idx += 1;
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k += 1;
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};
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};
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eoff += slotsize(c, et);
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te = te.next;
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};
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p = p.next;
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continue;
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}; };
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if (isfloattype(c, p.lhs)) {
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// Float param: SysV uses the XMM stream
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// (X0..X7). 8B (f64) or 4B (f32) slot.
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let fsz: i32 = 8;
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if (isf32type(c, p.lhs)) { fsz = 4; };
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if (fidx < 8) {
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let off: i32 = localadd(c, nm, fsz, p.lhs);
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let mov: str = "MOVSD";
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if (fsz == 4) { mov = "MOVSS"; };
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emitline("\t");
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emitline(mov);
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emitline("\t");
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emitline(fargregname(fidx));
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emitline(", ");
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emitoff(off: i64);
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emitline("(BP)\n");
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fidx += 1;
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} else {
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localaddstack(c, nm, p.lhs, 16 + stkcursor*8);
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stkcursor += 1;
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};
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p = p.next;
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continue;
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};
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let sfc: i32 = structfloatclass(c, p.lhs);
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if (sfc != 0) {
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// #165: float-bearing struct PARAM receive (param
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// twin of #163's tuple). Classify each SysV
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// eightbyte; a lone-f64 eightbyte reads its XMM
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// (X0..X7), a pure-INT eightbyte its INTEGER arg reg
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// (DI/SI/..), stored into the param slot at the
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// 8-byte eightbyte stride. Gated to qualifying
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// structs by structfloatclass — all-int + f32-packed
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// fall through to the GP struct arm below (byte-id /
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// #165b). Reg overflow loud-stops (rule 7).
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let off: i32 = localadd(c, nm, structparamsize(c, p.lhs), p.lhs);
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let nb: i32 = sfc & 15;
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let e: i32 = 0;
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for (e < nb) {
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let issse: bool = (sfc & (16 << e)) != 0;
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if (issse) {
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if (fidx >= 8) {
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let msg: str = "float struct param eightbyte overflows SSE arg regs (X0..X7); stitch out of scope, see #165\n";
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os.write(2, msg.ptr, msg.len: u64);
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os.exit(1);
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};
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emitline("\tMOVSD\t");
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emitline(fargregname(fidx));
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emitline(", ");
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emitoff((off + e*8): i64);
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emitline("(BP)\n");
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fidx += 1;
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} else {
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if (idx >= 6) {
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let msg: str = "float struct param eightbyte overflows integer arg regs (DI/SI/DX/CX/R8/R9); stitch out of scope, see #165\n";
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os.write(2, msg.ptr, msg.len: u64);
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os.exit(1);
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};
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + e*8): i64);
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emitline("(BP)\n");
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idx += 1;
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};
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e += 1;
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};
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p = p.next;
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continue;
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};
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if (istaggedtype(c, p.lhs)) {
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let slot: i32 = slotsize(c, p.lhs);
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let nw: i32 = slot / 8;
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if (idx + nw <= 6) {
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let off: i32 = localadd(c, nm, slot, p.lhs);
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let w: i32 = 0;
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for (w < nw) {
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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idx += 1;
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w += 1;
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};
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} else { if (idx < 6 && nw > 1) {
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// Partial fit: fill remaining regs, then read
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// the tail from positive BP offsets. Mirrors
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// the caller's greedy reg fill in pushargsrev.
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let off: i32 = localadd(c, nm, slot, p.lhs);
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let regs_left: i32 = 6 - idx;
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let w: i32 = 0;
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for (w < regs_left) {
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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idx += 1;
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w += 1;
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};
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for (w < nw) {
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emitline("\tMOVQ\t");
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emitoff((16 + stkcursor*8): i64);
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emitline("(BP), AX\n");
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emitline("\tMOVQ\tAX, ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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stkcursor += 1;
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w += 1;
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};
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} else {
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localaddstack(c, nm, p.lhs, 16 + stkcursor*8);
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stkcursor += nw;
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};};
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} else { if (isslicetype(c, p.lhs)) {
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if (idx + 3 <= 6) {
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let off: i32 = localadd(c, nm, tyslicesize(): i32, p.lhs);
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff(off: i64);
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emitline("(BP)\n");
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idx += 1;
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + 8): i64);
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emitline("(BP)\n");
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idx += 1;
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + 16): i64);
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emitline("(BP)\n");
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idx += 1;
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} else { if (idx < 6) {
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// Partial-fit stitch — mirrors tagged at lines
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// 440-469. Caller's pushargsrev greedy-fills the
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// remaining argregs (ptr,len,cap order), the tail
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// spills to +16+stkcursor*8(BP).
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let off: i32 = localadd(c, nm, tyslicesize(): i32, p.lhs);
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let regs_left: i32 = 6 - idx;
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let w: i32 = 0;
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for (w < regs_left) {
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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idx += 1;
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w += 1;
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};
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for (w < 3) {
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emitline("\tMOVQ\t");
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emitoff((16 + stkcursor*8): i64);
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emitline("(BP), AX\n");
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emitline("\tMOVQ\tAX, ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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stkcursor += 1;
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w += 1;
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};
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} else {
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localaddstack(c, nm, p.lhs, 16 + stkcursor*8);
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stkcursor += 3;
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};};
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} else { if (isstrtype(c, p.lhs)) {
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if (idx + 3 <= 6) {
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// str IS []u8: 3-word param (ptr,len,cap), same as
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// the slice arm above (#1/Phase 3). #60: route slot
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// width through the primtypesize SSoT so #1's ty_str
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// bump propagates here.
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let off: i32 = localadd(c, nm, primtypesize("str"): i32, p.lhs);
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff(off: i64);
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emitline("(BP)\n");
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idx += 1;
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + 8): i64);
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emitline("(BP)\n");
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idx += 1;
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + 16): i64);
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emitline("(BP)\n");
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idx += 1;
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} else { if (idx < 6) {
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// Partial-fit stitch — mirrors the slice arm above.
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// #60: same SSoT routing as the regs-fit arm above.
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let off: i32 = localadd(c, nm, primtypesize("str"): i32, p.lhs);
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let regs_left: i32 = 6 - idx;
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let w: i32 = 0;
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for (w < regs_left) {
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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idx += 1;
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w += 1;
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};
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for (w < 3) {
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emitline("\tMOVQ\t");
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emitoff((16 + stkcursor*8): i64);
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emitline("(BP), AX\n");
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emitline("\tMOVQ\tAX, ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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stkcursor += 1;
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w += 1;
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};
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} else {
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localaddstack(c, nm, p.lhs, 16 + stkcursor*8);
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stkcursor += 3;
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};};
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} else { let stsz: i32 = structparamsize(c, p.lhs);
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if (stsz > 0) {
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// User-defined by-value struct ≤ 16B: 1 or 2
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// integer eightbytes. Mirrors cstage's
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// `struct_eb = (pu->size > 8) ? 2 : 1` and the
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// matching reg/stack/stitch arms in cgen.c cgfn.
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let nw: i32 = 1;
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if (stsz > 8) { nw = 2; };
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if (idx + nw <= 6) {
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let off: i32 = localadd(c, nm, stsz, p.lhs);
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let w: i32 = 0;
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for (w < nw) {
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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idx += 1;
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w += 1;
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};
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} else { if (idx < 6 && nw > 1) {
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let off: i32 = localadd(c, nm, stsz, p.lhs);
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let regs_left: i32 = 6 - idx;
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let w: i32 = 0;
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for (w < regs_left) {
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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idx += 1;
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w += 1;
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};
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for (w < nw) {
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emitline("\tMOVQ\t");
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emitoff((16 + stkcursor*8): i64);
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emitline("(BP), AX\n");
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emitline("\tMOVQ\tAX, ");
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emitoff((off + w*8): i64);
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emitline("(BP)\n");
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stkcursor += 1;
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w += 1;
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};
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} else {
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localaddstack(c, nm, p.lhs, 16 + stkcursor*8);
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stkcursor += nw;
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};};
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} else {
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if (idx < 6) {
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let off: i32 = localadd(c, nm, 8, p.lhs);
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emitline("\tMOVQ\t");
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emitline(argregname(idx));
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emitline(", ");
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emitoff(off: i64);
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emitline("(BP)\n");
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idx += 1;
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} else {
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localaddstack(c, nm, p.lhs, 16 + stkcursor*8);
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stkcursor += 1;
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};
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};
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};};};
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};
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p = p.next;
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};
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};
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fn cgfn(c: *cgen, fn_: *node) void = {
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cgeninit(c);
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c.fnname = fn_.str;
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c.curmod = fn_.nmod;
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c.fnret = fn_.lhs;
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|
|
// sret callee (#23): return type is plain TY_STRUCT > 24B.
|
|
// Reserve 8B for @sretarg (holds the saved hidden RDI dest
|
|
// pointer); cgfnparams skips DI for user args, cgreturn writes
|
|
// through *(@sretarg) and returns @sretarg in RAX.
|
|
let sret_callee: bool = sretretsize(c, c.fnret) > 0;
|
|
|
|
// Capture the body into cgoutstate while c.frame grows under
|
|
// emit-time localadd calls (#15/#26c — wwstage dropped its
|
|
// scanlocals pre-pass to align DOWN with cstage's first-use
|
|
// pattern). The prologue (TEXT label, PUSHQ/MOVQ/SUBQ) emits
|
|
// after the body finishes so the frame size reflects every
|
|
// localadd. Mirrors cstage cmd/w6c/cgen.c cgfn which builds
|
|
// `subsp`/`text` Progs up front and patches their `from.offset`
|
|
// at the end via txt_emit.
|
|
cgout_enable();
|
|
|
|
if (sret_callee) {
|
|
let saoff: i32 = localadd(c, "@sretarg", 8, nil);
|
|
emitline("\tMOVQ\tDI, ");
|
|
emitoff(saoff: i64);
|
|
emitline("(BP)\n");
|
|
};
|
|
|
|
cgfnparams(c, fn_.list);
|
|
c.lastwasreturn = 0;
|
|
// Iterate the fn body's statements directly rather than dispatching
|
|
// the outermost N_BLOCK through cgstmt — cgblock now save/restores
|
|
// c.locals to scope inner shadows (post-#27), but the function body
|
|
// is not "an inner block": defers (queued during the body) and the
|
|
// implicit-return epilogue both call cgexpr after this loop and
|
|
// resolve identifiers via localfind, so the body's locals must
|
|
// still be in c.locals when we get there.
|
|
if (fn_.body != nil) {
|
|
if (fn_.body.kind == nkind.N_BLOCK) {
|
|
let s: *node = fn_.body.list;
|
|
for (s != nil) {
|
|
cgstmt(c, s);
|
|
s = s.next;
|
|
};
|
|
} else {
|
|
cgstmt(c, fn_.body);
|
|
};
|
|
};
|
|
|
|
if (c.lastwasreturn == 0) {
|
|
// Run any registered defers in LIFO order before the
|
|
// implicit return.
|
|
rundefers(c);
|
|
// Zero AX before the fall-through return — matches cstage,
|
|
// which always emits this so void-returning fns don't leak
|
|
// a stale callee value to their caller.
|
|
emitline("\tMOVQ\t$0, AX\n");
|
|
emitline("\tMOVQ\tBP, SP\n");
|
|
emitline("\tPOPQ\tBP\n");
|
|
emitline("\tRET\n");
|
|
};
|
|
|
|
cgout_disable();
|
|
|
|
let frame: i32 = c.frame;
|
|
if ((frame & 15) != 0) { frame = (frame + 15) & ~15; };
|
|
|
|
// Emit the TEXT label via emitfnname so the def site picks up the
|
|
// same skip rule (FFI / `main` / empty-module) and the same module
|
|
// hint (this fn's own module) that the call sites use.
|
|
emitline("TEXT ");
|
|
emitfnname(c, fn_.str, fn_.nmod);
|
|
emitline(",$");
|
|
emitint(frame: i64);
|
|
emitline("\n");
|
|
|
|
emitline("\tPUSHQ\tBP\n");
|
|
emitline("\tMOVQ\tSP, BP\n");
|
|
emitline("\tSUBQ\t$");
|
|
emitint(frame: i64);
|
|
emitline(", SP\n");
|
|
|
|
cgout_flush();
|
|
};
|
|
|
|
// ---- file-level entry ------------------------------------------------
|
|
|
|
export fn cgfile(c: *cgen, file: *node) void = {
|
|
if (file == nil) { return; };
|
|
c.strlits = nil;
|
|
c.strlitseq = 0;
|
|
collectaliases(c, file);
|
|
// Enums must register before structs — fieldsize on a tkind-typed
|
|
// field needs the enum's storage size, otherwise it falls back to
|
|
// 8 (wrong load width).
|
|
collectenums(c, file);
|
|
collectstructs(c, file);
|
|
collectdefs(c, file);
|
|
collectfnrets(c, file);
|
|
fficollect(c, file);
|
|
collectmods(c, file);
|
|
collectlets(c, file);
|
|
let d: *node = file.list;
|
|
for (d != nil) {
|
|
if (d.kind == nkind.N_FNDECL) {
|
|
if (d.body != nil) {
|
|
cgfn(c, d);
|
|
};
|
|
};
|
|
d = d.next;
|
|
};
|
|
letpreintern(c, file);
|
|
emitdatasection(c);
|
|
emitdefconstants(c, file);
|
|
emitletdataw(c, file);
|
|
};
|