void s_ifdef (int test_defined) { /* Points to name of symbol. */ char *name; /* Points to symbol. */ symbolS *symbolP; struct conditional_frame cframe; char c; /* Leading whitespace is part of operand. */ SKIP_WHITESPACE (); name = input_line_pointer; if (!is_name_beginner (*name)) { as_bad (_("invalid identifier for \".ifdef\"")); obstack_1grow (&cond_obstack, 0); ignore_rest_of_line (); return; } c = get_symbol_end (); symbolP = symbol_find (name); *input_line_pointer = c; initialize_cframe (&cframe); if (cframe.dead_tree) cframe.ignoring = 1; else { int is_defined; /* Use the same definition of 'defined' as .equiv so that a symbol which has been referenced but not yet given a value/address is considered to be undefined. */ is_defined = symbolP != NULL && S_IS_DEFINED (symbolP) && S_GET_SEGMENT (symbolP) != reg_section; cframe.ignoring = ! (test_defined ^ is_defined); } current_cframe = ((struct conditional_frame *) obstack_copy (&cond_obstack, &cframe, sizeof (cframe))); if (LISTING_SKIP_COND () && cframe.ignoring && (cframe.previous_cframe == NULL || ! cframe.previous_cframe->ignoring)) listing_list (2); demand_empty_rest_of_line (); }
void coff_frob_symbol (symbolS *symp, int *punt) { static symbolS *last_tagP; static stack *block_stack; static symbolS *set_end; symbolS *next_set_end = NULL; if (symp == &abs_symbol) { *punt = 1; return; } if (current_lineno_sym) coff_add_linesym (NULL); if (!block_stack) block_stack = stack_init (512, sizeof (symbolS*)); #ifdef TE_PE if (S_GET_STORAGE_CLASS (symp) == C_NT_WEAK && ! S_IS_WEAK (symp) && weak_is_altname (S_GET_NAME (symp))) { /* This is a weak alternate symbol. All processing of PECOFFweak symbols is done here, through the alternate. */ symbolS *weakp = symbol_find_noref (weak_altname2name (S_GET_NAME (symp)), 1); assert (weakp); assert (S_GET_NUMBER_AUXILIARY (weakp) == 1); if (! S_IS_WEAK (weakp)) { /* The symbol was turned from weak to strong. Discard altname. */ *punt = 1; return; } else if (symbol_equated_p (weakp)) { /* The weak symbol has an alternate specified; symp is unneeded. */ S_SET_STORAGE_CLASS (weakp, C_NT_WEAK); SA_SET_SYM_TAGNDX (weakp, symbol_get_value_expression (weakp)->X_add_symbol); S_CLEAR_EXTERNAL (symp); *punt = 1; return; } else { /* The weak symbol has been assigned an alternate value. Copy this value to symp, and set symp as weakp's alternate. */ if (S_GET_STORAGE_CLASS (weakp) != C_NT_WEAK) { S_SET_STORAGE_CLASS (symp, S_GET_STORAGE_CLASS (weakp)); S_SET_STORAGE_CLASS (weakp, C_NT_WEAK); } if (S_IS_DEFINED (weakp)) { /* This is a defined weak symbol. Copy value information from the weak symbol itself to the alternate symbol. */ symbol_set_value_expression (symp, symbol_get_value_expression (weakp)); symbol_set_frag (symp, symbol_get_frag (weakp)); S_SET_SEGMENT (symp, S_GET_SEGMENT (weakp)); } else { /* This is an undefined weak symbol. Define the alternate symbol to zero. */ S_SET_VALUE (symp, 0); S_SET_SEGMENT (symp, absolute_section); } S_SET_NAME (symp, weak_uniquify (S_GET_NAME (symp))); S_SET_STORAGE_CLASS (symp, C_EXT); S_SET_VALUE (weakp, 0); S_SET_SEGMENT (weakp, undefined_section); } } #else /* TE_PE */ if (S_IS_WEAK (symp)) S_SET_STORAGE_CLASS (symp, C_WEAKEXT); #endif /* TE_PE */ if (!S_IS_DEFINED (symp) && !S_IS_WEAK (symp) && S_GET_STORAGE_CLASS (symp) != C_STAT) S_SET_STORAGE_CLASS (symp, C_EXT); if (!SF_GET_DEBUG (symp)) { symbolS * real; if (!SF_GET_LOCAL (symp) && !SF_GET_STATICS (symp) && S_GET_STORAGE_CLASS (symp) != C_LABEL && symbol_constant_p (symp) && (real = symbol_find_noref (S_GET_NAME (symp), 1)) && S_GET_STORAGE_CLASS (real) == C_NULL && real != symp) { c_symbol_merge (symp, real); *punt = 1; return; } if (!S_IS_DEFINED (symp) && !SF_GET_LOCAL (symp)) { assert (S_GET_VALUE (symp) == 0); if (S_IS_WEAKREFD (symp)) *punt = 1; else S_SET_EXTERNAL (symp); } else if (S_GET_STORAGE_CLASS (symp) == C_NULL) { if (S_GET_SEGMENT (symp) == text_section && symp != seg_info (text_section)->sym) S_SET_STORAGE_CLASS (symp, C_LABEL); else S_SET_STORAGE_CLASS (symp, C_STAT); } if (SF_GET_PROCESS (symp)) { if (S_GET_STORAGE_CLASS (symp) == C_BLOCK) { if (streq (S_GET_NAME (symp), ".bb")) stack_push (block_stack, (char *) &symp); else { symbolS *begin; begin = *(symbolS **) stack_pop (block_stack); if (begin == 0) as_warn (_("mismatched .eb")); else next_set_end = begin; } } if (coff_last_function == 0 && SF_GET_FUNCTION (symp)) { union internal_auxent *auxp; coff_last_function = symp; if (S_GET_NUMBER_AUXILIARY (symp) < 1) S_SET_NUMBER_AUXILIARY (symp, 1); auxp = SYM_AUXENT (symp); memset (auxp->x_sym.x_fcnary.x_ary.x_dimen, 0, sizeof (auxp->x_sym.x_fcnary.x_ary.x_dimen)); } if (S_GET_STORAGE_CLASS (symp) == C_EFCN) { if (coff_last_function == 0) as_fatal (_("C_EFCN symbol for %s out of scope"), S_GET_NAME (symp)); SA_SET_SYM_FSIZE (coff_last_function, (long) (S_GET_VALUE (symp) - S_GET_VALUE (coff_last_function))); next_set_end = coff_last_function; coff_last_function = 0; } } if (S_IS_EXTERNAL (symp)) S_SET_STORAGE_CLASS (symp, C_EXT); else if (SF_GET_LOCAL (symp)) *punt = 1; if (SF_GET_FUNCTION (symp)) symbol_get_bfdsym (symp)->flags |= BSF_FUNCTION; } /* Double check weak symbols. */ if (S_IS_WEAK (symp) && S_IS_COMMON (symp)) as_bad (_("Symbol `%s' can not be both weak and common"), S_GET_NAME (symp)); if (SF_GET_TAG (symp)) last_tagP = symp; else if (S_GET_STORAGE_CLASS (symp) == C_EOS) next_set_end = last_tagP; #ifdef OBJ_XCOFF /* This is pretty horrible, but we have to set *punt correctly in order to call SA_SET_SYM_ENDNDX correctly. */ if (! symbol_used_in_reloc_p (symp) && ((symbol_get_bfdsym (symp)->flags & BSF_SECTION_SYM) != 0 || (! (S_IS_EXTERNAL (symp) || S_IS_WEAK (symp)) && ! symbol_get_tc (symp)->output && S_GET_STORAGE_CLASS (symp) != C_FILE))) *punt = 1; #endif if (set_end != (symbolS *) NULL && ! *punt && ((symbol_get_bfdsym (symp)->flags & BSF_NOT_AT_END) != 0 || (S_IS_DEFINED (symp) && ! S_IS_COMMON (symp) && (! S_IS_EXTERNAL (symp) || SF_GET_FUNCTION (symp))))) { SA_SET_SYM_ENDNDX (set_end, symp); set_end = NULL; } if (next_set_end != NULL) { if (set_end != NULL) as_warn ("Warning: internal error: forgetting to set endndx of %s", S_GET_NAME (set_end)); set_end = next_set_end; } #ifndef OBJ_XCOFF if (! *punt && S_GET_STORAGE_CLASS (symp) == C_FCN && streq (S_GET_NAME (symp), ".bf")) { if (coff_last_bf != NULL) SA_SET_SYM_ENDNDX (coff_last_bf, symp); coff_last_bf = symp; } #endif if (coffsymbol (symbol_get_bfdsym (symp))->lineno) { int i; struct line_no *lptr; alent *l; lptr = (struct line_no *) coffsymbol (symbol_get_bfdsym (symp))->lineno; for (i = 0; lptr; lptr = lptr->next) i++; lptr = (struct line_no *) coffsymbol (symbol_get_bfdsym (symp))->lineno; /* We need i entries for line numbers, plus 1 for the first entry which BFD will override, plus 1 for the last zero entry (a marker for BFD). */ l = xmalloc ((i + 2) * sizeof (* l)); coffsymbol (symbol_get_bfdsym (symp))->lineno = l; l[i + 1].line_number = 0; l[i + 1].u.sym = NULL; for (; i > 0; i--) { if (lptr->frag) lptr->l.u.offset += lptr->frag->fr_address / OCTETS_PER_BYTE; l[i] = lptr->l; lptr = lptr->next; } } }
int check_eh_frame (expressionS *exp, unsigned int *pnbytes) { struct frame_data { enum frame_state state; int cie_info_ok; struct cie_info cie_info; symbolS *size_end_sym; fragS *loc4_frag; int loc4_fix; int aug_size; int aug_shift; }; static struct frame_data eh_frame_data; static struct frame_data debug_frame_data; struct frame_data *d; /* Don't optimize. */ if (flag_traditional_format) return 0; #ifdef md_allow_eh_opt if (! md_allow_eh_opt) return 0; #endif /* Select the proper section data. */ if (strncmp (segment_name (now_seg), ".eh_frame", 9) == 0 && segment_name (now_seg)[9] != '_') d = &eh_frame_data; else if (strncmp (segment_name (now_seg), ".debug_frame", 12) == 0) d = &debug_frame_data; else return 0; if (d->state >= state_saw_size && S_IS_DEFINED (d->size_end_sym)) { /* We have come to the end of the CIE or FDE. See below where we set saw_size. We must check this first because we may now be looking at the next size. */ d->state = state_idle; } switch (d->state) { case state_idle: if (*pnbytes == 4) { /* This might be the size of the CIE or FDE. We want to know the size so that we don't accidentally optimize across an FDE boundary. We recognize the size in one of two forms: a symbol which will later be defined as a difference, or a subtraction of two symbols. Either way, we can tell when we are at the end of the FDE because the symbol becomes defined (in the case of a subtraction, the end symbol, from which the start symbol is being subtracted). Other ways of describing the size will not be optimized. */ if ((exp->X_op == O_symbol || exp->X_op == O_subtract) && ! S_IS_DEFINED (exp->X_add_symbol)) { d->state = state_saw_size; d->size_end_sym = exp->X_add_symbol; } } break; case state_saw_size: case state_saw_cie_offset: /* Assume whatever form it appears in, it appears atomically. */ d->state = (enum frame_state) (d->state + 1); break; case state_saw_pc_begin: /* Decide whether we should see an augmentation. */ if (! d->cie_info_ok && ! (d->cie_info_ok = get_cie_info (&d->cie_info))) d->state = state_error; else if (d->cie_info.z_augmentation) { d->state = state_seeing_aug_size; d->aug_size = 0; d->aug_shift = 0; } else d->state = state_wait_loc4; break; case state_seeing_aug_size: /* Bytes == -1 means this comes from an leb128 directive. */ if ((int)*pnbytes == -1 && exp->X_op == O_constant) { d->aug_size = exp->X_add_number; d->state = state_skipping_aug; } else if (*pnbytes == 1 && exp->X_op == O_constant) { unsigned char byte = exp->X_add_number; d->aug_size |= (byte & 0x7f) << d->aug_shift; d->aug_shift += 7; if ((byte & 0x80) == 0) d->state = state_skipping_aug; } else d->state = state_error; if (d->state == state_skipping_aug && d->aug_size == 0) d->state = state_wait_loc4; break; case state_skipping_aug: if ((int)*pnbytes < 0) d->state = state_error; else { int left = (d->aug_size -= *pnbytes); if (left == 0) d->state = state_wait_loc4; else if (left < 0) d->state = state_error; } break; case state_wait_loc4: if (*pnbytes == 1 && exp->X_op == O_constant && exp->X_add_number == DW_CFA_advance_loc4) { /* This might be a DW_CFA_advance_loc4. Record the frag and the position within the frag, so that we can change it later. */ frag_grow (1); d->state = state_saw_loc4; d->loc4_frag = frag_now; d->loc4_fix = frag_now_fix (); } break; case state_saw_loc4: d->state = state_wait_loc4; if (*pnbytes != 4) break; if (exp->X_op == O_constant) { /* This is a case which we can optimize. The two symbols being subtracted were in the same frag and the expression was reduced to a constant. We can do the optimization entirely in this function. */ if (exp->X_add_number < 0x40) { d->loc4_frag->fr_literal[d->loc4_fix] = DW_CFA_advance_loc | exp->X_add_number; /* No more bytes needed. */ return 1; } else if (exp->X_add_number < 0x100) { d->loc4_frag->fr_literal[d->loc4_fix] = DW_CFA_advance_loc1; *pnbytes = 1; } else if (exp->X_add_number < 0x10000) { d->loc4_frag->fr_literal[d->loc4_fix] = DW_CFA_advance_loc2; *pnbytes = 2; } } else if (exp->X_op == O_subtract && d->cie_info.code_alignment == 1) { /* This is a case we can optimize. The expression was not reduced, so we can not finish the optimization until the end of the assembly. We set up a variant frag which we handle later. */ frag_var (rs_cfa, 4, 0, 1 << 3, make_expr_symbol (exp), d->loc4_fix, (char *) d->loc4_frag); return 1; } else if ((exp->X_op == O_divide || exp->X_op == O_right_shift) && d->cie_info.code_alignment > 1) { if (symbol_symbolS (exp->X_add_symbol) && symbol_constant_p (exp->X_op_symbol) && S_GET_SEGMENT (exp->X_op_symbol) == absolute_section && ((exp->X_op == O_divide ? *symbol_X_add_number (exp->X_op_symbol) : (offsetT) 1 << *symbol_X_add_number (exp->X_op_symbol)) == (offsetT) d->cie_info.code_alignment)) { expressionS *symval; symval = symbol_get_value_expression (exp->X_add_symbol); if (symval->X_op == O_subtract) { /* This is a case we can optimize as well. The expression was not reduced, so we can not finish the optimization until the end of the assembly. We set up a variant frag which we handle later. */ frag_var (rs_cfa, 4, 0, d->cie_info.code_alignment << 3, make_expr_symbol (symval), d->loc4_fix, (char *) d->loc4_frag); return 1; } } } break; case state_error: /* Just skipping everything. */ break; } return 0; }
static void nemaweaver_s_lcomm (int xxx ATTRIBUTE_UNUSED) { char *name; char c; char *p; offsetT size; symbolS *symbolP; offsetT align; char *pfrag; int align2; segT current_seg = now_seg; subsegT current_subseg = now_subseg; name = input_line_pointer; c = get_symbol_end (); /* Just after name is now '\0'. */ p = input_line_pointer; *p = c; SKIP_WHITESPACE (); if (*input_line_pointer != ',') { as_bad (_("Expected comma after symbol-name: rest of line ignored.")); ignore_rest_of_line (); return; } input_line_pointer++; /* skip ',' */ if ((size = get_absolute_expression ()) < 0) { as_warn (_(".COMMon length (%ld.) <0! Ignored."), (long) size); ignore_rest_of_line (); return; } /* The third argument to .lcomm is the alignment. */ if (*input_line_pointer != ',') align = 8; else { ++input_line_pointer; align = get_absolute_expression (); if (align <= 0) { as_warn (_("ignoring bad alignment")); align = 8; } } *p = 0; symbolP = symbol_find_or_make (name); *p = c; if (S_IS_DEFINED (symbolP) && ! S_IS_COMMON (symbolP)) { as_bad (_("Ignoring attempt to re-define symbol `%s'."), S_GET_NAME (symbolP)); ignore_rest_of_line (); return; } if (S_GET_VALUE (symbolP) && S_GET_VALUE (symbolP) != (valueT) size) { as_bad (_("Length of .lcomm \"%s\" is already %ld. Not changed to %ld."), S_GET_NAME (symbolP), (long) S_GET_VALUE (symbolP), (long) size); ignore_rest_of_line (); return; } /* Allocate_bss. */ if (align) { /* Convert to a power of 2 alignment. */ for (align2 = 0; (align & 1) == 0; align >>= 1, ++align2); if (align != 1) { as_bad (_("Common alignment not a power of 2")); ignore_rest_of_line (); return; } } else