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tccdbg.c
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/*
* TCC - Tiny C Compiler
*
* Copyright (c) 2001-2004 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "tcc.h"
/* stab debug support */
static const struct {
int type;
int size;
int encoding;
const char *name;
} default_debug[] = {
{ VT_INT, 4, DW_ATE_signed, "int:t1=r1;-2147483648;2147483647;" },
{ VT_BYTE, 1, DW_ATE_signed_char, "char:t2=r2;0;127;" },
#if LONG_SIZE == 4
{ VT_LONG | VT_INT, 4, DW_ATE_signed, "long int:t3=r3;-2147483648;2147483647;" },
#else
{ VT_LLONG | VT_LONG, 8, DW_ATE_signed, "long int:t3=r3;-9223372036854775808;9223372036854775807;" },
#endif
{ VT_INT | VT_UNSIGNED, 4, DW_ATE_unsigned, "unsigned int:t4=r4;0;037777777777;" },
#if LONG_SIZE == 4
{ VT_LONG | VT_INT | VT_UNSIGNED, 4, DW_ATE_unsigned, "long unsigned int:t5=r5;0;037777777777;" },
#else
/* use octal instead of -1 so size_t works (-gstabs+ in gcc) */
{ VT_LLONG | VT_LONG | VT_UNSIGNED, 8, DW_ATE_unsigned, "long unsigned int:t5=r5;0;01777777777777777777777;" },
#endif
{ VT_QLONG, 16, DW_ATE_signed, "__int128:t6=r6;0;-1;" },
{ VT_QLONG | VT_UNSIGNED, 16, DW_ATE_unsigned, "__int128 unsigned:t7=r7;0;-1;" },
{ VT_LLONG, 8, DW_ATE_signed, "long long int:t8=r8;-9223372036854775808;9223372036854775807;" },
{ VT_LLONG | VT_UNSIGNED, 8, DW_ATE_unsigned, "long long unsigned int:t9=r9;0;01777777777777777777777;" },
{ VT_SHORT, 2, DW_ATE_signed, "short int:t10=r10;-32768;32767;" },
{ VT_SHORT | VT_UNSIGNED, 2, DW_ATE_unsigned, "short unsigned int:t11=r11;0;65535;" },
{ VT_BYTE | VT_DEFSIGN, 1, DW_ATE_signed_char, "signed char:t12=r12;-128;127;" },
{ VT_BYTE | VT_DEFSIGN | VT_UNSIGNED, 1, DW_ATE_unsigned_char, "unsigned char:t13=r13;0;255;" },
{ VT_FLOAT, 4, DW_ATE_float, "float:t14=r1;4;0;" },
{ VT_DOUBLE, 8, DW_ATE_float, "double:t15=r1;8;0;" },
#ifdef TCC_USING_DOUBLE_FOR_LDOUBLE
{ VT_DOUBLE | VT_LONG, 8, DW_ATE_float, "long double:t16=r1;8;0;" },
#else
{ VT_LDOUBLE, 16, DW_ATE_float, "long double:t16=r1;16;0;" },
#endif
{ -1, -1, -1, "_Float32:t17=r1;4;0;" },
{ -1, -1, -1, "_Float64:t18=r1;8;0;" },
{ -1, -1, -1, "_Float128:t19=r1;16;0;" },
{ -1, -1, -1, "_Float32x:t20=r1;8;0;" },
{ -1, -1, -1, "_Float64x:t21=r1;16;0;" },
{ -1, -1, -1, "_Decimal32:t22=r1;4;0;" },
{ -1, -1, -1, "_Decimal64:t23=r1;8;0;" },
{ -1, -1, -1, "_Decimal128:t24=r1;16;0;" },
/* if default char is unsigned */
{ VT_BYTE | VT_UNSIGNED, 1, DW_ATE_unsigned_char, "unsigned char:t25=r25;0;255;" },
/* boolean type */
{ VT_BOOL, 1, DW_ATE_boolean, "bool:t26=r26;0;255;" },
#if LONG_SIZE == 4
{ VT_VOID, 1, DW_ATE_unsigned_char, "void:t27=27" },
#else
/* bitfields use these */
{ VT_LONG | VT_INT, 8, DW_ATE_signed, "long int:t27=r27;-9223372036854775808;9223372036854775807;" },
{ VT_LONG | VT_INT | VT_UNSIGNED, 8, DW_ATE_unsigned, "long unsigned int:t28=r28;0;01777777777777777777777;" },
{ VT_VOID, 1, DW_ATE_unsigned_char, "void:t29=29" },
#endif
};
#define N_DEFAULT_DEBUG (sizeof (default_debug) / sizeof (default_debug[0]))
/* dwarf debug */
#define DWARF_LINE_BASE -5
#define DWARF_LINE_RANGE 14
#define DWARF_OPCODE_BASE 13
#if defined TCC_TARGET_ARM64
#define DWARF_MIN_INSTR_LEN 4
#elif defined TCC_TARGET_ARM
#define DWARF_MIN_INSTR_LEN 2
#else
#define DWARF_MIN_INSTR_LEN 1
#endif
#define DWARF_ABBREV_COMPILE_UNIT 1
#define DWARF_ABBREV_BASE_TYPE 2
#define DWARF_ABBREV_VARIABLE_EXTERNAL 3
#define DWARF_ABBREV_VARIABLE_STATIC 4
#define DWARF_ABBREV_VARIABLE_LOCAL 5
#define DWARF_ABBREV_FORMAL_PARAMETER 6
#define DWARF_ABBREV_POINTER 7
#define DWARF_ABBREV_ARRAY_TYPE 8
#define DWARF_ABBREV_SUBRANGE_TYPE 9
#define DWARF_ABBREV_TYPEDEF 10
#define DWARF_ABBREV_ENUMERATOR_SIGNED 11
#define DWARF_ABBREV_ENUMERATOR_UNSIGNED 12
#define DWARF_ABBREV_ENUMERATION_TYPE 13
#define DWARF_ABBREV_MEMBER 14
#define DWARF_ABBREV_MEMBER_BF 15
#define DWARF_ABBREV_STRUCTURE_TYPE 16
#define DWARF_ABBREV_STRUCTURE_EMPTY_TYPE 17
#define DWARF_ABBREV_UNION_TYPE 18
#define DWARF_ABBREV_UNION_EMPTY_TYPE 19
#define DWARF_ABBREV_SUBPROGRAM_EXTERNAL 20
#define DWARF_ABBREV_SUBPROGRAM_STATIC 21
#define DWARF_ABBREV_LEXICAL_BLOCK 22
#define DWARF_ABBREV_LEXICAL_EMPTY_BLOCK 23
#define DWARF_ABBREV_SUBROUTINE_TYPE 24
#define DWARF_ABBREV_SUBROUTINE_EMPTY_TYPE 25
#define DWARF_ABBREV_FORMAL_PARAMETER2 26
/* all entries should have been generated with dwarf_uleb128 except
has_children. All values are currently below 128 so this currently
works. */
static const unsigned char dwarf_abbrev_init[] = {
DWARF_ABBREV_COMPILE_UNIT, DW_TAG_compile_unit, 1,
DW_AT_producer, DW_FORM_strp,
DW_AT_language, DW_FORM_data1,
DW_AT_name, DW_FORM_line_strp,
DW_AT_comp_dir, DW_FORM_line_strp,
DW_AT_low_pc, DW_FORM_addr,
#if PTR_SIZE == 4
DW_AT_high_pc, DW_FORM_data4,
#else
DW_AT_high_pc, DW_FORM_data8,
#endif
DW_AT_stmt_list, DW_FORM_sec_offset,
0, 0,
DWARF_ABBREV_BASE_TYPE, DW_TAG_base_type, 0,
DW_AT_byte_size, DW_FORM_udata,
DW_AT_encoding, DW_FORM_data1,
DW_AT_name, DW_FORM_strp,
0, 0,
DWARF_ABBREV_VARIABLE_EXTERNAL, DW_TAG_variable, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
DW_AT_type, DW_FORM_ref4,
DW_AT_external, DW_FORM_flag,
DW_AT_location, DW_FORM_exprloc,
0, 0,
DWARF_ABBREV_VARIABLE_STATIC, DW_TAG_variable, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
DW_AT_type, DW_FORM_ref4,
DW_AT_location, DW_FORM_exprloc,
0, 0,
DWARF_ABBREV_VARIABLE_LOCAL, DW_TAG_variable, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_type, DW_FORM_ref4,
DW_AT_location, DW_FORM_exprloc,
0, 0,
DWARF_ABBREV_FORMAL_PARAMETER, DW_TAG_formal_parameter, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_type, DW_FORM_ref4,
DW_AT_location, DW_FORM_exprloc,
0, 0,
DWARF_ABBREV_POINTER, DW_TAG_pointer_type, 0,
DW_AT_byte_size, DW_FORM_data1,
DW_AT_type, DW_FORM_ref4,
0, 0,
DWARF_ABBREV_ARRAY_TYPE, DW_TAG_array_type, 1,
DW_AT_type, DW_FORM_ref4,
DW_AT_sibling, DW_FORM_ref4,
0, 0,
DWARF_ABBREV_SUBRANGE_TYPE, DW_TAG_subrange_type, 0,
DW_AT_type, DW_FORM_ref4,
DW_AT_upper_bound, DW_FORM_udata,
0, 0,
DWARF_ABBREV_TYPEDEF, DW_TAG_typedef, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
DW_AT_type, DW_FORM_ref4,
0, 0,
DWARF_ABBREV_ENUMERATOR_SIGNED, DW_TAG_enumerator, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_const_value, DW_FORM_sdata,
0, 0,
DWARF_ABBREV_ENUMERATOR_UNSIGNED, DW_TAG_enumerator, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_const_value, DW_FORM_udata,
0, 0,
DWARF_ABBREV_ENUMERATION_TYPE, DW_TAG_enumeration_type, 1,
DW_AT_name, DW_FORM_strp,
DW_AT_encoding, DW_FORM_data1,
DW_AT_byte_size, DW_FORM_data1,
DW_AT_type, DW_FORM_ref4,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
DW_AT_sibling, DW_FORM_ref4,
0, 0,
DWARF_ABBREV_MEMBER, DW_TAG_member, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
DW_AT_type, DW_FORM_ref4,
DW_AT_data_member_location, DW_FORM_udata,
0, 0,
DWARF_ABBREV_MEMBER_BF, DW_TAG_member, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
DW_AT_type, DW_FORM_ref4,
DW_AT_bit_size, DW_FORM_udata,
DW_AT_data_bit_offset, DW_FORM_udata,
0, 0,
DWARF_ABBREV_STRUCTURE_TYPE, DW_TAG_structure_type, 1,
DW_AT_name, DW_FORM_strp,
DW_AT_byte_size, DW_FORM_udata,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
DW_AT_sibling, DW_FORM_ref4,
0, 0,
DWARF_ABBREV_STRUCTURE_EMPTY_TYPE, DW_TAG_structure_type, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_byte_size, DW_FORM_udata,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
0, 0,
DWARF_ABBREV_UNION_TYPE, DW_TAG_union_type, 1,
DW_AT_name, DW_FORM_strp,
DW_AT_byte_size, DW_FORM_udata,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
DW_AT_sibling, DW_FORM_ref4,
0, 0,
DWARF_ABBREV_UNION_EMPTY_TYPE, DW_TAG_union_type, 0,
DW_AT_name, DW_FORM_strp,
DW_AT_byte_size, DW_FORM_udata,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
0, 0,
DWARF_ABBREV_SUBPROGRAM_EXTERNAL, DW_TAG_subprogram, 1,
DW_AT_external, DW_FORM_flag,
DW_AT_name, DW_FORM_strp,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
DW_AT_type, DW_FORM_ref4,
DW_AT_low_pc, DW_FORM_addr,
#if PTR_SIZE == 4
DW_AT_high_pc, DW_FORM_data4,
#else
DW_AT_high_pc, DW_FORM_data8,
#endif
DW_AT_sibling, DW_FORM_ref4,
DW_AT_frame_base, DW_FORM_exprloc,
0, 0,
DWARF_ABBREV_SUBPROGRAM_STATIC, DW_TAG_subprogram, 1,
DW_AT_name, DW_FORM_strp,
DW_AT_decl_file, DW_FORM_udata,
DW_AT_decl_line, DW_FORM_udata,
DW_AT_type, DW_FORM_ref4,
DW_AT_low_pc, DW_FORM_addr,
#if PTR_SIZE == 4
DW_AT_high_pc, DW_FORM_data4,
#else
DW_AT_high_pc, DW_FORM_data8,
#endif
DW_AT_sibling, DW_FORM_ref4,
DW_AT_frame_base, DW_FORM_exprloc,
0, 0,
DWARF_ABBREV_LEXICAL_BLOCK, DW_TAG_lexical_block, 1,
DW_AT_low_pc, DW_FORM_addr,
#if PTR_SIZE == 4
DW_AT_high_pc, DW_FORM_data4,
#else
DW_AT_high_pc, DW_FORM_data8,
#endif
0, 0,
DWARF_ABBREV_LEXICAL_EMPTY_BLOCK, DW_TAG_lexical_block, 0,
DW_AT_low_pc, DW_FORM_addr,
#if PTR_SIZE == 4
DW_AT_high_pc, DW_FORM_data4,
#else
DW_AT_high_pc, DW_FORM_data8,
#endif
0, 0,
DWARF_ABBREV_SUBROUTINE_TYPE, DW_TAG_subroutine_type, 1,
DW_AT_type, DW_FORM_ref4,
DW_AT_sibling, DW_FORM_ref4,
0, 0,
DWARF_ABBREV_SUBROUTINE_EMPTY_TYPE, DW_TAG_subroutine_type, 0,
DW_AT_type, DW_FORM_ref4,
0, 0,
DWARF_ABBREV_FORMAL_PARAMETER2, DW_TAG_formal_parameter, 0,
DW_AT_type, DW_FORM_ref4,
0, 0,
0
};
static const unsigned char dwarf_line_opcodes[] = {
0 ,1 ,1 ,1 ,1 ,0 ,0 ,0 ,1 ,0 ,0 ,1
};
/* ------------------------------------------------------------------------- */
/* debug state */
struct _tccdbg {
int last_line_num, new_file;
int section_sym;
int debug_next_type;
struct _debug_hash {
int debug_type;
Sym *type;
} *debug_hash;
struct _debug_anon_hash {
Sym *type;
int n_debug_type;
int *debug_type;
} *debug_anon_hash;
int n_debug_hash;
int n_debug_anon_hash;
struct _debug_info {
int start;
int end;
int n_sym;
struct debug_sym {
int type;
unsigned long value;
char *str;
Section *sec;
int sym_index;
int info;
int file;
int line;
} *sym;
struct _debug_info *child, *next, *last, *parent;
} *debug_info, *debug_info_root;
struct {
int info;
int abbrev;
int line;
int str;
int line_str;
} dwarf_sym;
struct {
int start;
int dir_size;
char **dir_table;
int filename_size;
struct dwarf_filename_struct {
int dir_entry;
char *name;
} *filename_table;
int line_size;
int line_max_size;
unsigned char *line_data;
int cur_file;
int last_file;
int last_pc;
int last_line;
} dwarf_line;
struct {
int start;
Sym *func;
int line;
int base_type_used[N_DEFAULT_DEBUG];
} dwarf_info;
/* test coverage */
struct {
unsigned long offset;
unsigned long last_file_name;
unsigned long last_func_name;
int ind;
int line;
} tcov_data;
};
#define last_line_num s1->dState->last_line_num
#define new_file s1->dState->new_file
#define section_sym s1->dState->section_sym
#define debug_next_type s1->dState->debug_next_type
#define debug_hash s1->dState->debug_hash
#define debug_anon_hash s1->dState->debug_anon_hash
#define n_debug_hash s1->dState->n_debug_hash
#define n_debug_anon_hash s1->dState->n_debug_anon_hash
#define debug_info s1->dState->debug_info
#define debug_info_root s1->dState->debug_info_root
#define dwarf_sym s1->dState->dwarf_sym
#define dwarf_line s1->dState->dwarf_line
#define dwarf_info s1->dState->dwarf_info
#define tcov_data s1->dState->tcov_data
#define FDE_ENCODING (DW_EH_PE_udata4 | DW_EH_PE_signed | DW_EH_PE_pcrel)
/* ------------------------------------------------------------------------- */
static void put_stabs(TCCState *s1, const char *str, int type, int other,
int desc, unsigned long value);
ST_FUNC void tcc_debug_new(TCCState *s1)
{
int shf = 0;
if (!s1->dState)
s1->dState = tcc_mallocz(sizeof *s1->dState);
#ifdef CONFIG_TCC_BACKTRACE
/* include stab info with standalone backtrace support */
if (s1->do_debug && s1->output_type == TCC_OUTPUT_MEMORY)
s1->do_backtrace = 1;
if (s1->do_backtrace)
shf = SHF_ALLOC; /* have debug data available at runtime */
#endif
if (s1->dwarf) {
s1->dwlo = s1->nb_sections;
dwarf_info_section =
new_section(s1, ".debug_info", SHT_PROGBITS, shf);
dwarf_abbrev_section =
new_section(s1, ".debug_abbrev", SHT_PROGBITS, shf);
dwarf_line_section =
new_section(s1, ".debug_line", SHT_PROGBITS, shf);
dwarf_aranges_section =
new_section(s1, ".debug_aranges", SHT_PROGBITS, shf);
shf |= SHF_MERGE | SHF_STRINGS;
dwarf_str_section =
new_section(s1, ".debug_str", SHT_PROGBITS, shf);
dwarf_str_section->sh_entsize = 1;
dwarf_info_section->sh_addralign =
dwarf_abbrev_section->sh_addralign =
dwarf_line_section->sh_addralign =
dwarf_aranges_section->sh_addralign =
dwarf_str_section->sh_addralign = 1;
if (s1->dwarf >= 5) {
dwarf_line_str_section =
new_section(s1, ".debug_line_str", SHT_PROGBITS, shf);
dwarf_line_str_section->sh_entsize = 1;
dwarf_line_str_section->sh_addralign = 1;
}
s1->dwhi = s1->nb_sections;
}
else
{
stab_section = new_section(s1, ".stab", SHT_PROGBITS, shf);
stab_section->sh_entsize = sizeof(Stab_Sym);
stab_section->sh_addralign = sizeof ((Stab_Sym*)0)->n_value;
stab_section->link = new_section(s1, ".stabstr", SHT_STRTAB, shf);
/* put first entry */
put_stabs(s1, "", 0, 0, 0, 0);
}
}
/* put stab debug information */
static void put_stabs(TCCState *s1, const char *str, int type, int other, int desc,
unsigned long value)
{
Stab_Sym *sym;
unsigned offset;
if (type == N_SLINE
&& (offset = stab_section->data_offset)
&& (sym = (Stab_Sym*)(stab_section->data + offset) - 1)
&& sym->n_type == type
&& sym->n_value == value) {
/* just update line_number in previous entry */
sym->n_desc = desc;
return;
}
sym = section_ptr_add(stab_section, sizeof(Stab_Sym));
if (str) {
sym->n_strx = put_elf_str(stab_section->link, str);
} else {
sym->n_strx = 0;
}
sym->n_type = type;
sym->n_other = other;
sym->n_desc = desc;
sym->n_value = value;
}
static void put_stabs_r(TCCState *s1, const char *str, int type, int other, int desc,
unsigned long value, Section *sec, int sym_index)
{
put_elf_reloc(symtab_section, stab_section,
stab_section->data_offset + 8,
sizeof ((Stab_Sym*)0)->n_value == PTR_SIZE ? R_DATA_PTR : R_DATA_32,
sym_index);
put_stabs(s1, str, type, other, desc, value);
}
static void put_stabn(TCCState *s1, int type, int other, int desc, int value)
{
put_stabs(s1, NULL, type, other, desc, value);
}
/* ------------------------------------------------------------------------- */
#define dwarf_data1(s,data) \
(*(uint8_t*)section_ptr_add((s), 1) = (data))
#define dwarf_data2(s,data) \
write16le(section_ptr_add((s), 2), (data))
#define dwarf_data4(s,data) \
write32le(section_ptr_add((s), 4), (data))
#define dwarf_data8(s,data) \
write64le(section_ptr_add((s), 8), (data))
static int dwarf_get_section_sym(Section *s)
{
TCCState *s1 = s->s1;
return put_elf_sym(symtab_section, 0, 0,
ELFW(ST_INFO)(STB_LOCAL, STT_SECTION), 0,
s->sh_num, NULL);
}
static void dwarf_reloc(Section *s, int sym, int rel)
{
TCCState *s1 = s->s1;
put_elf_reloca(symtab_section, s, s->data_offset, rel, sym, 0);
}
static void dwarf_string(Section *s, Section *dw, int sym, const char *str)
{
TCCState *s1 = s->s1;
int offset, len;
char *ptr;
len = strlen(str) + 1;
offset = dw->data_offset;
ptr = section_ptr_add(dw, len);
memmove(ptr, str, len);
put_elf_reloca(symtab_section, s, s->data_offset, R_DATA_32DW, sym,
PTR_SIZE == 4 ? 0 : offset);
dwarf_data4(s, PTR_SIZE == 4 ? offset : 0);
}
static void dwarf_strp(Section *s, const char *str)
{
TCCState *s1 = s->s1;
dwarf_string(s, dwarf_str_section, dwarf_sym.str, str);
}
static void dwarf_line_strp(Section *s, const char *str)
{
TCCState *s1 = s->s1;
dwarf_string(s, dwarf_line_str_section, dwarf_sym.line_str, str);
}
static void dwarf_line_op(TCCState *s1, unsigned char op)
{
if (dwarf_line.line_size >= dwarf_line.line_max_size) {
dwarf_line.line_max_size += 1024;
dwarf_line.line_data =
(unsigned char *)tcc_realloc(dwarf_line.line_data,
dwarf_line.line_max_size);
}
dwarf_line.line_data[dwarf_line.line_size++] = op;
}
static void dwarf_file(TCCState *s1)
{
int i, j;
char *filename;
int index_offset = s1->dwarf < 5;
if (!strcmp(file->filename, "<command line>")) {
dwarf_line.cur_file = 1;
return;
}
filename = strrchr(file->filename, '/');
if (filename == NULL) {
for (i = 1; i < dwarf_line.filename_size; i++)
if (dwarf_line.filename_table[i].dir_entry == 0 &&
strcmp(dwarf_line.filename_table[i].name,
file->filename) == 0) {
dwarf_line.cur_file = i + index_offset;
return;
}
i = -index_offset;
filename = file->filename;
}
else {
char *undo = filename;
char *dir = file->filename;
*filename++ = '\0';
for (i = 0; i < dwarf_line.dir_size; i++)
if (strcmp(dwarf_line.dir_table[i], dir) == 0) {
for (j = 1; j < dwarf_line.filename_size; j++)
if (dwarf_line.filename_table[j].dir_entry - index_offset
== i &&
strcmp(dwarf_line.filename_table[j].name,
filename) == 0) {
*undo = '/';
dwarf_line.cur_file = j + index_offset;
return;
}
break;
}
if (i == dwarf_line.dir_size) {
dwarf_line.dir_size++;
dwarf_line.dir_table =
(char **) tcc_realloc(dwarf_line.dir_table,
dwarf_line.dir_size *
sizeof (char *));
dwarf_line.dir_table[i] = tcc_strdup(dir);
}
*undo = '/';
}
dwarf_line.filename_table =
(struct dwarf_filename_struct *)
tcc_realloc(dwarf_line.filename_table,
(dwarf_line.filename_size + 1) *
sizeof (struct dwarf_filename_struct));
dwarf_line.filename_table[dwarf_line.filename_size].dir_entry =
i + index_offset;
dwarf_line.filename_table[dwarf_line.filename_size].name =
tcc_strdup(filename);
dwarf_line.cur_file = dwarf_line.filename_size++ + index_offset;
return;
}
#if 0
static int dwarf_uleb128_size (unsigned long long value)
{
int size = 0;
do {
value >>= 7;
size++;
} while (value != 0);
return size;
}
#endif
static int dwarf_sleb128_size (long long value)
{
int size = 0;
long long end = value >> 63;
unsigned char last = end & 0x40;
unsigned char byte;
do {
byte = value & 0x7f;
value >>= 7;
size++;
} while (value != end || (byte & 0x40) != last);
return size;
}
static void dwarf_uleb128 (Section *s, unsigned long long value)
{
do {
unsigned char byte = value & 0x7f;
value >>= 7;
dwarf_data1(s, byte | (value ? 0x80 : 0));
} while (value != 0);
}
static void dwarf_sleb128 (Section *s, long long value)
{
int more;
long long end = value >> 63;
unsigned char last = end & 0x40;
do {
unsigned char byte = value & 0x7f;
value >>= 7;
more = value != end || (byte & 0x40) != last;
dwarf_data1(s, byte | (0x80 * more));
} while (more);
}
static void dwarf_uleb128_op (TCCState *s1, unsigned long long value)
{
do {
unsigned char byte = value & 0x7f;
value >>= 7;
dwarf_line_op(s1, byte | (value ? 0x80 : 0));
} while (value != 0);
}
static void dwarf_sleb128_op (TCCState *s1, long long value)
{
int more;
long long end = value >> 63;
unsigned char last = end & 0x40;
do {
unsigned char byte = value & 0x7f;
value >>= 7;
more = value != end || (byte & 0x40) != last;
dwarf_line_op(s1, byte | (0x80 * more));
} while (more);
}
#if TCC_EH_FRAME
ST_FUNC void tcc_eh_frame_start(TCCState *s1)
{
if (!s1->unwind_tables)
return;
eh_frame_section = new_section(s1, ".eh_frame", SHT_PROGBITS, SHF_ALLOC);
s1->eh_start = eh_frame_section->data_offset;
dwarf_data4(eh_frame_section, 0); // length
dwarf_data4(eh_frame_section, 0); // CIE ID
dwarf_data1(eh_frame_section, 1); // Version
dwarf_data1(eh_frame_section, 'z'); // Augmentation String
dwarf_data1(eh_frame_section, 'R');
dwarf_data1(eh_frame_section, 0);
#if defined TCC_TARGET_I386
dwarf_uleb128(eh_frame_section, 1); // code_alignment_factor
dwarf_sleb128(eh_frame_section, -4); // data_alignment_factor
dwarf_uleb128(eh_frame_section, 8); // return address column
dwarf_uleb128(eh_frame_section, 1); // Augmentation len
dwarf_data1(eh_frame_section, FDE_ENCODING);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa);
dwarf_uleb128(eh_frame_section, 4); // r4 (esp)
dwarf_uleb128(eh_frame_section, 4); // ofs 4
dwarf_data1(eh_frame_section, DW_CFA_offset + 8); // r8 (eip)
dwarf_uleb128(eh_frame_section, 1); // cfa-4
#elif defined TCC_TARGET_X86_64
dwarf_uleb128(eh_frame_section, 1); // code_alignment_factor
dwarf_sleb128(eh_frame_section, -8); // data_alignment_factor
dwarf_uleb128(eh_frame_section, 16); // return address column
dwarf_uleb128(eh_frame_section, 1); // Augmentation len
dwarf_data1(eh_frame_section, FDE_ENCODING);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa);
dwarf_uleb128(eh_frame_section, 7); // r7 (rsp)
dwarf_uleb128(eh_frame_section, 8); // ofs 8
dwarf_data1(eh_frame_section, DW_CFA_offset + 16); // r16 (rip)
dwarf_uleb128(eh_frame_section, 1); // cfa-8
#elif defined TCC_TARGET_ARM
/* TODO: arm must be compiled with: -funwind-tables */
/* arm also uses .ARM.extab and .ARM.exidx sections */
dwarf_uleb128(eh_frame_section, 2); // code_alignment_factor
dwarf_sleb128(eh_frame_section, -4); // data_alignment_factor
dwarf_uleb128(eh_frame_section, 14); // return address column
dwarf_uleb128(eh_frame_section, 1); // Augmentation len
dwarf_data1(eh_frame_section, FDE_ENCODING);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa);
dwarf_uleb128(eh_frame_section, 13); // r13 (sp)
dwarf_uleb128(eh_frame_section, 0); // ofs 0
#elif defined TCC_TARGET_ARM64
dwarf_uleb128(eh_frame_section, 4); // code_alignment_factor
dwarf_sleb128(eh_frame_section, -8); // data_alignment_factor
dwarf_uleb128(eh_frame_section, 30); // return address column
dwarf_uleb128(eh_frame_section, 1); // Augmentation len
dwarf_data1(eh_frame_section, FDE_ENCODING);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa);
dwarf_uleb128(eh_frame_section, 31); // x31 (sp)
dwarf_uleb128(eh_frame_section, 0); // ofs 0
#elif defined TCC_TARGET_RISCV64
eh_frame_section->data[s1->eh_start + 8] = 3; // version = 3
dwarf_uleb128(eh_frame_section, 1); // code_alignment_factor
dwarf_sleb128(eh_frame_section, -4); // data_alignment_factor
dwarf_uleb128(eh_frame_section, 1); // return address column
dwarf_uleb128(eh_frame_section, 1); // Augmentation len
dwarf_data1(eh_frame_section, FDE_ENCODING);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa);
dwarf_uleb128(eh_frame_section, 2); // r2 (sp)
dwarf_uleb128(eh_frame_section, 0); // ofs 0
#endif
while ((eh_frame_section->data_offset - s1->eh_start) & 3)
dwarf_data1(eh_frame_section, DW_CFA_nop);
write32le(eh_frame_section->data + s1->eh_start, // length
eh_frame_section->data_offset - s1->eh_start - 4);
}
static void tcc_debug_frame_end(TCCState *s1, int size)
{
int eh_section_sym;
unsigned long fde_start;
if (!eh_frame_section)
return;
eh_section_sym = dwarf_get_section_sym(text_section);
fde_start = eh_frame_section->data_offset;
dwarf_data4(eh_frame_section, 0); // length
dwarf_data4(eh_frame_section,
fde_start - s1->eh_start + 4); // CIE Pointer
#if defined TCC_TARGET_I386
dwarf_reloc(eh_frame_section, eh_section_sym, R_386_PC32);
#elif defined TCC_TARGET_X86_64
dwarf_reloc(eh_frame_section, eh_section_sym, R_X86_64_PC32);
#elif defined TCC_TARGET_ARM
dwarf_reloc(eh_frame_section, eh_section_sym, R_ARM_REL32);
#elif defined TCC_TARGET_ARM64
dwarf_reloc(eh_frame_section, eh_section_sym, R_AARCH64_PREL32);
#elif defined TCC_TARGET_RISCV64
dwarf_reloc(eh_frame_section, eh_section_sym, R_RISCV_32_PCREL);
#endif
dwarf_data4(eh_frame_section, func_ind); // PC Begin
dwarf_data4(eh_frame_section, size); // PC Range
dwarf_data1(eh_frame_section, 0); // Augmentation Length
#if defined TCC_TARGET_I386
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 1);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_offset);
dwarf_uleb128(eh_frame_section, 8);
dwarf_data1(eh_frame_section, DW_CFA_offset + 5); // r5 (ebp)
dwarf_uleb128(eh_frame_section, 2); // cfa-8
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 2);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_register);
dwarf_uleb128(eh_frame_section, 5); // r5 (ebp)
dwarf_data1(eh_frame_section, DW_CFA_advance_loc4);
dwarf_data4(eh_frame_section, size - 5);
dwarf_data1(eh_frame_section, DW_CFA_restore + 5); // r5 (ebp)
dwarf_data1(eh_frame_section, DW_CFA_def_cfa);
dwarf_uleb128(eh_frame_section, 4); // r4 (esp)
dwarf_uleb128(eh_frame_section, 4); // ofs 4
#elif defined TCC_TARGET_X86_64
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 1);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_offset);
dwarf_uleb128(eh_frame_section, 16);
dwarf_data1(eh_frame_section, DW_CFA_offset + 6); // r6 (rbp)
dwarf_uleb128(eh_frame_section, 2); // cfa-16
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 3);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_register);
dwarf_uleb128(eh_frame_section, 6); // r6 (rbp)
dwarf_data1(eh_frame_section, DW_CFA_advance_loc4);
dwarf_data4(eh_frame_section, size - 5);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa);
dwarf_uleb128(eh_frame_section, 7); // r7 (rsp)
dwarf_uleb128(eh_frame_section, 8); // ofs 8
#elif defined TCC_TARGET_ARM
/* TODO */
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 2);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_offset);
dwarf_uleb128(eh_frame_section, 8);
dwarf_data1(eh_frame_section, DW_CFA_offset + 14); // r14 (lr)
dwarf_uleb128(eh_frame_section, 1);
dwarf_data1(eh_frame_section, DW_CFA_offset + 11); // r11 (fp)
dwarf_uleb128(eh_frame_section, 2);
dwarf_data1(eh_frame_section, DW_CFA_advance_loc4);
dwarf_data4(eh_frame_section, size / 2 - 5);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_register);
dwarf_uleb128(eh_frame_section, 11); // r11 (fp)
#elif defined TCC_TARGET_ARM64
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 1);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_offset);
dwarf_uleb128(eh_frame_section, 224);
dwarf_data1(eh_frame_section, DW_CFA_offset + 29); // x29 (fp)
dwarf_uleb128(eh_frame_section, 28); // cfa-224
dwarf_data1(eh_frame_section, DW_CFA_offset + 30); // x30 (lr)
dwarf_uleb128(eh_frame_section, 27); // cfa-216
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 3);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_offset);
dwarf_uleb128(eh_frame_section, 224 + ((-loc + 15) & ~15));
dwarf_data1(eh_frame_section, DW_CFA_advance_loc4);
dwarf_data4(eh_frame_section, size / 4 - 5);
dwarf_data1(eh_frame_section, DW_CFA_restore + 30); // x30 (lr)
dwarf_data1(eh_frame_section, DW_CFA_restore + 29); // x29 (fp)
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_offset);
dwarf_uleb128(eh_frame_section, 0);
#elif defined TCC_TARGET_RISCV64
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 4);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_offset);
dwarf_uleb128(eh_frame_section, 16); // ofs 16
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 8);
dwarf_data1(eh_frame_section, DW_CFA_offset + 1); // r1 (ra, lr)
dwarf_uleb128(eh_frame_section, 2); // cfa-8
dwarf_data1(eh_frame_section, DW_CFA_offset + 8); // r8 (s0, fp)
dwarf_uleb128(eh_frame_section, 4); // cfa-16
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 8);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa);
dwarf_uleb128(eh_frame_section, 8); // r8 (s0, fp)
dwarf_uleb128(eh_frame_section, 0); // ofs 0
dwarf_data1(eh_frame_section, DW_CFA_advance_loc4);
while (size >= 4 &&
read32le(cur_text_section->data + func_ind + size - 4) != 0x00008067)
size -= 4;
dwarf_data4(eh_frame_section, size - 36);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa);
dwarf_uleb128(eh_frame_section, 2); // r2 (r2, sp)
dwarf_uleb128(eh_frame_section, 16); // ofs 16
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 4);
dwarf_data1(eh_frame_section, DW_CFA_restore + 1); // r1 (lr)
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 4);
dwarf_data1(eh_frame_section, DW_CFA_restore + 8); // r8 (s0, fp)
dwarf_data1(eh_frame_section, DW_CFA_advance_loc + 4);
dwarf_data1(eh_frame_section, DW_CFA_def_cfa_offset);
dwarf_uleb128(eh_frame_section, 0); // ofs 0
#endif
while ((eh_frame_section->data_offset - fde_start) & 3)
dwarf_data1(eh_frame_section, DW_CFA_nop);
write32le(eh_frame_section->data + fde_start, // length
eh_frame_section->data_offset - fde_start - 4);
}
ST_FUNC void tcc_eh_frame_end(TCCState *s1)
{
if (!eh_frame_section)
return;
dwarf_data4(eh_frame_section, 0);
}
struct eh_search_table {
uint32_t pc_offset;
uint32_t fde_offset;
};
static int sort_eh_table(const void *a, const void *b)
{
uint32_t pc1 = ((const struct eh_search_table *)a)->pc_offset;
uint32_t pc2 = ((const struct eh_search_table *)b)->pc_offset;
return pc1 < pc2 ? -1 : pc1 > pc2 ? 1 : 0;
}
ST_FUNC void tcc_eh_frame_hdr(TCCState *s1, int final)
{
int count = 0, offset;
unsigned long count_offset, tab_offset;
unsigned char *ln, *end;
unsigned int last_cie_offset = 0xffffffff;
if (!eh_frame_section || !eh_frame_section->data_offset)
return;
if (final && !eh_frame_hdr_section)
return;
if (final == 0)
eh_frame_hdr_section =
new_section(s1, ".eh_frame_hdr", SHT_PROGBITS, SHF_ALLOC);
eh_frame_hdr_section->data_offset = 0;
dwarf_data1(eh_frame_hdr_section, 1); // Version
// Pointer Encoding Format
dwarf_data1(eh_frame_hdr_section, DW_EH_PE_sdata4 | DW_EH_PE_pcrel);
// Count Encoding Format
dwarf_data1(eh_frame_hdr_section, DW_EH_PE_udata4 | DW_EH_PE_absptr);
// Table Encoding Format
dwarf_data1(eh_frame_hdr_section, DW_EH_PE_sdata4 | DW_EH_PE_datarel);
offset = eh_frame_section->sh_addr -
eh_frame_hdr_section->sh_addr -
eh_frame_hdr_section->data_offset;
dwarf_data4(eh_frame_hdr_section, offset); // eh_frame_ptr
// Count
count_offset = eh_frame_hdr_section->data_offset;
dwarf_data4(eh_frame_hdr_section, 0);
tab_offset = eh_frame_hdr_section->data_offset;
ln = eh_frame_section->data;
end = eh_frame_section->data + eh_frame_section->data_offset;
while (ln < end) {
unsigned char *fde = ln, *rd = ln;
unsigned int cie_offset, version, length = dwarf_read_4(rd, end);
unsigned int pc_offset, fde_offset;
if (length == 0)
goto next;
cie_offset = dwarf_read_4(rd, end);
if (cie_offset == 0)
goto next;
if (cie_offset != last_cie_offset) {
unsigned char *cie = rd - cie_offset + 4;
if (cie < eh_frame_section->data)
goto next;
version = dwarf_read_1(cie, end);
if ((version == 1 || version == 3) &&
dwarf_read_1(cie, end) == 'z' && // Augmentation String
dwarf_read_1(cie, end) == 'R' &&
dwarf_read_1(cie, end) == 0) {
dwarf_read_uleb128(&cie, end); // code_alignment_factor
dwarf_read_sleb128(&cie, end); // data_alignment_factor
dwarf_read_1(cie, end); // return address column
if (dwarf_read_uleb128(&cie, end) == 1 &&
dwarf_read_1(cie, end) == FDE_ENCODING) {
last_cie_offset = cie_offset;
}
else
goto next;
}
else
goto next;
}
count++;
fde_offset = eh_frame_section->sh_addr +
(fde - eh_frame_section->data) -
eh_frame_hdr_section->sh_addr;
pc_offset = dwarf_read_4(rd, end) + fde_offset + 8;
dwarf_data4(eh_frame_hdr_section, pc_offset);
dwarf_data4(eh_frame_hdr_section, fde_offset);
next: