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#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdalign.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "errors.h"
#include "parser.h"
/* #define AST_DFLT_CAP (2048) */
#define AST_DFLT_CAP (8)
#define AST_EMPTY ((size_t)-1)
#define AUX_DFLT_CAP (128)
#define SIZE_WDTH (sizeof(size_t) * CHAR_BIT)
static size_t parsedecl(struct ast_soa *, struct lexemes_soa);
static size_t parseexpr(struct ast_soa *, struct lexemes_soa);
static size_t parsetype(struct ast_soa *, struct lexemes_soa);
static struct ast_soa mk_ast_soa(void);
static void ast_soa_resz(struct ast_soa *);
static size_t aux_push(struct auxilliary *, union extra);
static size_t ast_soa_push(struct ast_soa *, ast_kind, size_t, size_t, size_t,
size_t);
static size_t toksidx;
struct ast_soa
parsetoks(struct lexemes_soa toks)
{
struct ast_soa ast = mk_ast_soa();
while (toksidx < toks.len)
parsedecl(&ast, toks);
return ast;
}
size_t
parsedecl(struct ast_soa *ast, struct lexemes_soa toks)
{
bool constdecl;
size_t lexeme, lhs, rhs;
lexeme = toksidx;
if (toks.kinds[toksidx++] != LEXIDENT)
err("Expected identifier");
if (toks.kinds[toksidx++] != LEXCOLON)
err("Expected colon");
switch (toks.kinds[toksidx]) {
case LEXCOLON:
case LEXEQ:
constdecl = toks.kinds[toksidx++] == LEXCOLON;
lhs = AST_EMPTY;
rhs = parseexpr(ast, toks);
break;
default:
lhs = parsetype(ast, toks);
if (toks.kinds[toksidx] == LEXCOLON || toks.kinds[toksidx] == LEXEQ) {
constdecl = toks.kinds[toksidx++] == LEXEQ;
rhs = parseexpr(ast, toks);
} else {
constdecl = false;
rhs = AST_EMPTY;
}
break;
}
if (toks.kinds[toksidx++] != LEXSEMI)
err("Expected semicolon");
size_t extra = aux_push(&ast->aux, (union extra){.constdecl = constdecl});
return ast_soa_push(ast, PRSDECL, lexeme, lhs, rhs, extra);
}
size_t
parseexpr(struct ast_soa *ast, struct lexemes_soa toks)
{
ast_kind kind;
size_t lexeme, lhs, rhs, extra;
lexeme = lhs = rhs = extra = AST_EMPTY;
switch (toks.kinds[toksidx]) {
case LEXNUM:
kind = PRSNUMERIC;
lexeme = toksidx++;
break;
default:
err("Expected expression");
}
return ast_soa_push(ast, kind, lexeme, lhs, rhs, extra);
}
size_t
parsetype(struct ast_soa *ast, struct lexemes_soa toks)
{
size_t lexeme;
switch (toks.kinds[toksidx]) {
case LEXIDENT:
lexeme = toksidx++;
break;
default:
err("Expected type");
}
return ast_soa_push(ast, PRSTYPE, lexeme, AST_EMPTY, AST_EMPTY, AST_EMPTY);
}
struct ast_soa
mk_ast_soa(void)
{
struct ast_soa soa;
static_assert(AST_DFLT_CAP * sizeof(*soa.kinds) % alignof(*soa.lexemes)
== 0,
"Additional padding is required to properly align LEXEMES");
static_assert(AST_DFLT_CAP * (sizeof(*soa.kinds) + sizeof(*soa.lexemes))
% alignof(*soa.kids)
== 0,
"Additional padding is required to properly align KIDS");
static_assert(AST_DFLT_CAP
* (sizeof(*soa.kinds) + sizeof(*soa.lexemes)
+ sizeof(*soa.kids))
% alignof(*soa.extra)
== 0,
"Additional padding is required to properly align EXTRA");
soa.len = 0;
soa.cap = AST_DFLT_CAP;
soa.aux.len = 0;
soa.aux.cap = AUX_DFLT_CAP;
if ((soa.kinds = malloc(soa.cap * AST_SOA_BLKSZ)) == NULL)
err("malloc:");
soa.lexemes = (void *)((char *)soa.kinds + soa.cap * sizeof(*soa.kinds));
soa.kids = (void *)((char *)soa.lexemes + soa.cap * sizeof(*soa.lexemes));
soa.extra = (void *)((char *)soa.kids + soa.cap * sizeof(*soa.kids));
if ((soa.aux.buf = malloc(soa.aux.cap * sizeof(*soa.aux.buf))) == NULL)
err("malloc:");
return soa;
}
void
ast_soa_resz(struct ast_soa *soa)
{
size_t ncap, pad1, pad2, pad3, newsz;
ptrdiff_t lexemes_off, kids_off, extra_off;
lexemes_off = (char *)soa->lexemes - (char *)soa->kinds;
kids_off = (char *)soa->kids - (char *)soa->kinds;
extra_off = (char *)soa->extra - (char *)soa->kinds;
/* The capacity is always going to be a power of 2, so checking for overflow
becomes pretty trivial */
if ((soa->cap >> (SIZE_WDTH - 1)) != 0) {
errno = EOVERFLOW;
err("ast_soa_resz:");
}
ncap = soa->cap << 1;
/* Ensure that soa->lexemes is properly aligned */
pad1 = alignof(*soa->lexemes)
- ncap * sizeof(*soa->kinds) % alignof(*soa->lexemes);
if (pad1 == alignof(*soa->lexemes))
pad1 = 0;
/* Ensure that soa->kids is properly aligned */
pad2 = alignof(*soa->kids)
- (ncap * (sizeof(*soa->kinds) + sizeof(*soa->lexemes)) + pad1)
% alignof(*soa->kids);
if (pad2 != alignof(*soa->kids))
pad2 = 0;
/* Ensure that soa->extra is properly aligned */
pad3 = alignof(*soa->extra)
- (ncap
* (sizeof(*soa->kinds) + sizeof(*soa->lexemes)
+ sizeof(*soa->kids))
+ pad1 + pad2)
% alignof(*soa->extra);
if (pad3 != alignof(*soa->extra))
pad3 = 0;
newsz = ncap * AST_SOA_BLKSZ + pad1 + pad2 + pad3;
if ((soa->kinds = realloc(soa->kinds, newsz)) == NULL)
err("realloc:");
soa->lexemes = (void *)((char *)soa->kinds + ncap * sizeof(*soa->kinds)
+ pad1);
soa->kids = (void *)((char *)soa->lexemes + ncap * sizeof(*soa->lexemes)
+ pad2);
soa->extra = (void *)((char *)soa->kids + ncap * sizeof(*soa->kids) + pad3);
memmove(soa->extra, (char *)soa->kinds + extra_off,
soa->len * sizeof(*soa->extra));
memmove(soa->kids, (char *)soa->kinds + kids_off,
soa->len * sizeof(*soa->kids));
memmove(soa->lexemes, (char *)soa->kinds + lexemes_off,
soa->len * sizeof(*soa->lexemes));
soa->cap = ncap;
}
size_t
aux_push(struct auxilliary *aux, union extra e)
{
if (aux->len == aux->cap) {
size_t ncap = aux->cap * 2;
if ((aux->buf = realloc(aux->buf, ncap)) == NULL)
err("realloc:");
aux->cap = ncap;
}
aux->buf[aux->len] = e;
return aux->len++;
}
size_t
ast_soa_push(struct ast_soa *soa, ast_kind kind, size_t lexeme, size_t lhs,
size_t rhs, size_t extra)
{
if (soa->len == soa->cap)
ast_soa_resz(soa);
soa->kinds[soa->len] = kind;
soa->lexemes[soa->len] = lexeme;
soa->kids[soa->len].lhs = lhs;
soa->kids[soa->len].rhs = rhs;
soa->extra[soa->len] = extra;
return soa->len++;
}
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