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Allow to get sym attr and fail if no entry

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Change alloc_sym_attr into get_sym_attr and add a parameter to control
whether to allocate a new symattr structure or return NULL if symbol is
not found;
This commit is contained in:
Thomas Preud'homme 2016-11-12 23:16:07 +08:00
parent a11b0a67e3
commit 2c38800bbe
2 changed files with 27 additions and 23 deletions
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6
tcc.h
View File

@ -570,6 +570,7 @@ typedef struct ASMOperand {
} ASMOperand; } ASMOperand;
#endif #endif
/* extra symbol attributes (not in symbol table) */
struct sym_attr { struct sym_attr {
unsigned long got_offset; unsigned long got_offset;
unsigned long plt_offset; unsigned long plt_offset;
@ -708,8 +709,6 @@ struct TCCState {
/* got & plt handling */ /* got & plt handling */
Section *got; Section *got;
Section *plt; Section *plt;
struct sym_attr *sym_attrs;
int nb_sym_attrs;
/* give the correspondance from symtab indexes to dynsym indexes */ /* give the correspondance from symtab indexes to dynsym indexes */
int *symtab_to_dynsym; int *symtab_to_dynsym;
@ -719,6 +718,9 @@ struct TCCState {
Section *dynsym; Section *dynsym;
/* copy of the gobal symtab_section variable */ /* copy of the gobal symtab_section variable */
Section *symtab; Section *symtab;
/* extra attributes (eg. GOT/PLT value) for symtab symbols */
struct sym_attr *sym_attrs;
int nb_sym_attrs;
/* tiny assembler state */ /* tiny assembler state */
Sym *asm_labels; Sym *asm_labels;

44
tccelf.c
View File

@ -542,6 +542,27 @@ ST_FUNC void put_stabd(int type, int other, int desc)
put_stabs(NULL, type, other, desc, 0); put_stabs(NULL, type, other, desc, 0);
} }
static struct sym_attr *get_sym_attr(TCCState *s1, int index, int alloc)
{
int n;
struct sym_attr *tab;
if (index >= s1->nb_sym_attrs) {
if (!alloc)
return NULL;
/* find immediately bigger power of 2 and reallocate array */
n = 1;
while (index >= n)
n *= 2;
tab = tcc_realloc(s1->sym_attrs, n * sizeof(*s1->sym_attrs));
s1->sym_attrs = tab;
memset(s1->sym_attrs + s1->nb_sym_attrs, 0,
(n - s1->nb_sym_attrs) * sizeof(*s1->sym_attrs));
s1->nb_sym_attrs = n;
}
return &s1->sym_attrs[index];
}
/* Browse each elem of type <type> in section <sec> starting at elem <startoff> /* Browse each elem of type <type> in section <sec> starting at elem <startoff>
using variable <elem> */ using variable <elem> */
#define for_each_elem(sec, startoff, elem, type) \ #define for_each_elem(sec, startoff, elem, type) \
@ -768,25 +789,6 @@ static int prepare_dynamic_rel(TCCState *s1, Section *sr)
return count; return count;
} }
static struct sym_attr *alloc_sym_attr(TCCState *s1, int index)
{
int n;
struct sym_attr *tab;
if (index >= s1->nb_sym_attrs) {
/* find immediately bigger power of 2 and reallocate array */
n = 1;
while (index >= n)
n *= 2;
tab = tcc_realloc(s1->sym_attrs, n * sizeof(*s1->sym_attrs));
s1->sym_attrs = tab;
memset(s1->sym_attrs + s1->nb_sym_attrs, 0,
(n - s1->nb_sym_attrs) * sizeof(*s1->sym_attrs));
s1->nb_sym_attrs = n;
}
return &s1->sym_attrs[index];
}
static void build_got(TCCState *s1) static void build_got(TCCState *s1)
{ {
unsigned char *ptr; unsigned char *ptr;
@ -851,7 +853,7 @@ static unsigned long put_got_entry(TCCState *s1, int dyn_reloc_type,
return s1->sym_attrs[sym_index].got_offset; return s1->sym_attrs[sym_index].got_offset;
} }
symattr = alloc_sym_attr(s1, sym_index); symattr = get_sym_attr(s1, sym_index, 1);
/* create the GOT entry */ /* create the GOT entry */
ptr = section_ptr_add(s1->got, PTR_SIZE); ptr = section_ptr_add(s1->got, PTR_SIZE);
@ -2619,7 +2621,7 @@ ST_FUNC int tcc_load_object_file(TCCState *s1,
switch to ARM mode. We set bit plt_thumb_stub of the switch to ARM mode. We set bit plt_thumb_stub of the
attribute of a symbol to indicate such a case. */ attribute of a symbol to indicate such a case. */
if (type == R_ARM_THM_JUMP24) if (type == R_ARM_THM_JUMP24)
alloc_sym_attr(s1, sym_index)->plt_thumb_stub = 1; get_sym_attr(s1, sym_index, 1)->plt_thumb_stub = 1;
#endif #endif
} }
break; break;