Hojun-Cho
f1440bf9e8
Both stages emitted fn TEXT labels by leaf only; lib/os and lib/io
exporting the same leaves (read, write, close) collided at link.
lib/fmt + lib/log worked around with @symbol("rt_syscall") stubs.
Drop d->export from the fn skip rule in mod_collect (both stages) so
exported fns mangle as <module>.<name>. Let/def/type keep current
behavior. Skip retained for {@symbol, main, empty-module}.
Add cur_mod thread through cgfn + mod_lookup_for_fn(name, hint) at
all 4 label-emit sites (TEXT def, LEAQ N_IDENT, CALL N_IDENT, CALL
N_DOT). Wwstage mirror: emitfnname + modlookupforfn + curmod.
Invariant comment pinned in both stages.
ww2 == ww3 == ww4 byte-identical at the new label format.
706_fnlabel_mangle covers same-leaf cross-module CALL + private-leaf
cur_mod disambiguation through a fn-pointer rvalue.
Wwstage LEAQ-of-fn N_DOT (`let p = mod.fn` rvalue) is a pre-existing
gap; deferred to a follow-up. fmt/log rt_syscall stubs untouched
here; cleanup follows.
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
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* gc.h — w6c-private header: Prog/Adr structs, scratch register set,
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* stack-frame state. Plan 9 cmd/6c/gc.h shape, trimmed.
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*/
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#ifndef SIX_GC_H
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#define SIX_GC_H
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#include "ww.h"
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#include "6.out.h"
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typedef struct Prog Prog;
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typedef struct Adr Adr;
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/* one operand: register, immediate, indirect, or symbolic. */
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struct Adr {
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int type; /* D_AX, D_CONST, D_INDIR, ... */
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int reg; /* base register for D_INDIR */
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long long offset; /* immediate value or memory displacement */
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const char *sym; /* symbol name for D_EXTERN/D_BRANCH */
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};
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struct Prog {
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int as; /* opcode (A_MOVQ, ...) */
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Adr from; /* source operand */
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Adr to; /* destination operand (Plan 9 order) */
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int line;
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const char *label; /* if non-NULL, this prog is preceded by label: */
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Prog *link;
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};
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/* per-fn codegen state */
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typedef struct Cg Cg;
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struct Cg {
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Arena *a;
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Prog *head, *tail;
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const char *fnname;
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const char *cur_mod; /* current fn's `// MODULE: foo` directive,
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* NULL when the fn lives in the primary
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* file (no MODULE: stamp). Drives bare-IDENT
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* call mangling — `frob()` from within
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* lib/foo binds to `foo.frob` regardless
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* of which other modules also export `frob`.
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* Set by cgfn before walking the body. */
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int framesize; /* bytes of locals; 16-byte aligned */
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int curoff; /* current top of locals */
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Scope *locals; /* (name → offset) tracked via Sym */
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int labelseq;
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};
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/* cgen.c */
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void cg_init(Cg*, Arena*);
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void cg_file(Cg*, FILE *out, Node *file);
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Prog *newprog(Cg*, int op);
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void emit(Cg*, Prog*);
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/* txt.c */
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void txt_emit(FILE*, Prog *head);
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/* swt.c, peep.c, reg.c — placeholders for now */
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void peephole(Cg*);
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void regalloc_init(Cg*);
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#endif
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