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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_UNION_TYPE 17
#define DWARF_ABBREV_SUBPROGRAM_EXTERNAL 18
#define DWARF_ABBREV_SUBPROGRAM_STATIC 19
#define DWARF_ABBREV_LEXICAL_BLOCK 20
#define DWARF_ABBREV_SUBROUTINE_TYPE 21
#define DWARF_ABBREV_FORMAL_PARAMETER2 22
/* 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_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_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_SUBROUTINE_TYPE, DW_TAG_subroutine_type, 1,
DW_AT_type, DW_FORM_ref4,
DW_AT_sibling, 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
/* ------------------------------------------------------------------------- */
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_backtrace
&& (s1->output_type == TCC_OUTPUT_EXE
|| s1->output_type == TCC_OUTPUT_DLL)
)
shf = SHF_ALLOC | SHF_WRITE; // SHF_WRITE needed for musl/SELINUX
#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) \
{ unsigned char *p = section_ptr_add((s), 1); *p = (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;
char *filename;
filename = strrchr(file->filename, '/');
if (filename == NULL) {
for (i = 0; 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;
return;
}
}
else {
int j;
char *undo = filename;
*filename++ = '\0';
for (i = 0; i < dwarf_line.dir_size; i++)
if (strcmp(dwarf_line.dir_table[i], file->filename) == 0)
for (j = 1; j < dwarf_line.filename_size; j++)
if (dwarf_line.filename_table[j].dir_entry == i &&
strcmp(dwarf_line.filename_table[j].name,
filename) == 0) {
*undo = '/';
dwarf_line.cur_file = j;
return;
}
*undo = '/';
}
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);
}
/* start of translation unit info */
ST_FUNC void tcc_debug_start(TCCState *s1)
{
int i;
char buf[512];
char *filename;
/* an elf symbol of type STT_FILE must be put so that STB_LOCAL
symbols can be safely used */
filename = file->prev ? file->prev->filename : file->filename;
put_elf_sym(symtab_section, 0, 0,
ELFW(ST_INFO)(STB_LOCAL, STT_FILE), 0,
SHN_ABS, filename);
if (s1->do_debug) {
new_file = last_line_num = 0;
debug_next_type = N_DEFAULT_DEBUG;
debug_hash = NULL;
debug_anon_hash = NULL;
n_debug_hash = 0;
n_debug_anon_hash = 0;
getcwd(buf, sizeof(buf));
#ifdef _WIN32
normalize_slashes(buf);
#endif
if (s1->dwarf) {
int start_abbrev;
unsigned char *ptr;
char *undo;
/* dwarf_abbrev */
start_abbrev = dwarf_abbrev_section->data_offset;
ptr = section_ptr_add(dwarf_abbrev_section, sizeof(dwarf_abbrev_init));
memcpy(ptr, dwarf_abbrev_init, sizeof(dwarf_abbrev_init));
if (s1->dwarf < 5) {
while (*ptr) {
ptr += 3;
while (*ptr) {
if (ptr[1] == DW_FORM_line_strp)
ptr[1] = DW_FORM_strp;
if (s1->dwarf < 4) {
/* These are compatable for DW_TAG_compile_unit
DW_AT_stmt_list. */
if (ptr[1] == DW_FORM_sec_offset)
ptr[1] = DW_FORM_data4;
/* This code uses only size < 0x80 so these are
compatible. */
if (ptr[1] == DW_FORM_exprloc)
ptr[1] = DW_FORM_block1;
}
ptr += 2;
}
ptr += 2;
}
}
dwarf_sym.info = dwarf_get_section_sym(dwarf_info_section);
dwarf_sym.abbrev = dwarf_get_section_sym(dwarf_abbrev_section);
dwarf_sym.line = dwarf_get_section_sym(dwarf_line_section);
dwarf_sym.str = dwarf_get_section_sym(dwarf_str_section);
if (tcc_state->dwarf >= 5)
dwarf_sym.line_str = dwarf_get_section_sym(dwarf_line_str_section);
else {
dwarf_line_str_section = dwarf_str_section;
dwarf_sym.line_str = dwarf_sym.str;
}
section_sym = dwarf_get_section_sym(text_section);
/* dwarf_info */
dwarf_info.start = dwarf_info_section->data_offset;
dwarf_data4(dwarf_info_section, 0); // size
dwarf_data2(dwarf_info_section, s1->dwarf); // version
if (s1->dwarf >= 5) {
dwarf_data1(dwarf_info_section, DW_UT_compile); // unit type
dwarf_data1(dwarf_info_section, PTR_SIZE);
dwarf_reloc(dwarf_info_section, dwarf_sym.abbrev, R_DATA_32DW);
dwarf_data4(dwarf_info_section, start_abbrev);
}
else {
dwarf_reloc(dwarf_info_section, dwarf_sym.abbrev, R_DATA_32DW);
dwarf_data4(dwarf_info_section, start_abbrev);
dwarf_data1(dwarf_info_section, PTR_SIZE);
}
dwarf_data1(dwarf_info_section, DWARF_ABBREV_COMPILE_UNIT);
dwarf_strp(dwarf_info_section, "tcc " TCC_VERSION);
dwarf_data1(dwarf_info_section, DW_LANG_C11);
dwarf_line_strp(dwarf_info_section, filename);
dwarf_line_strp(dwarf_info_section, buf);
dwarf_reloc(dwarf_info_section, section_sym, R_DATA_PTR);
#if PTR_SIZE == 4
dwarf_data4(dwarf_info_section, ind); // low pc
dwarf_data4(dwarf_info_section, 0); // high pc
#else
dwarf_data8(dwarf_info_section, ind); // low pc
dwarf_data8(dwarf_info_section, 0); // high pc
#endif
dwarf_reloc(dwarf_info_section, dwarf_sym.line, R_DATA_32DW);
dwarf_data4(dwarf_info_section, dwarf_line_section->data_offset); // stmt_list
/* dwarf_line */
dwarf_line.start = dwarf_line_section->data_offset;
dwarf_data4(dwarf_line_section, 0); // length
dwarf_data2(dwarf_line_section, s1->dwarf); // version
if (s1->dwarf >= 5) {
dwarf_data1(dwarf_line_section, PTR_SIZE); // address size
dwarf_data1(dwarf_line_section, 0); // segment selector
}
dwarf_data4(dwarf_line_section, 0); // prologue Length
dwarf_data1(dwarf_line_section, DWARF_MIN_INSTR_LEN);
if (s1->dwarf >= 4)
dwarf_data1(dwarf_line_section, 1); // maximum ops per instruction
dwarf_data1(dwarf_line_section, 1); // Initial value of 'is_stmt'
dwarf_data1(dwarf_line_section, DWARF_LINE_BASE);
dwarf_data1(dwarf_line_section, DWARF_LINE_RANGE);
dwarf_data1(dwarf_line_section, DWARF_OPCODE_BASE);
ptr = section_ptr_add(dwarf_line_section, sizeof(dwarf_line_opcodes));
memcpy(ptr, dwarf_line_opcodes, sizeof(dwarf_line_opcodes));
undo = strrchr(filename, '/');
if (undo)
*undo = 0;
dwarf_line.dir_size = 1 + (undo != NULL);
dwarf_line.dir_table = (char **) tcc_malloc(sizeof (char *) *
dwarf_line.dir_size);
dwarf_line.dir_table[0] = tcc_strdup(buf);
if (undo)
dwarf_line.dir_table[1] = tcc_strdup(filename);
dwarf_line.filename_size = 2;
dwarf_line.filename_table =
(struct dwarf_filename_struct *)
tcc_malloc(2*sizeof (struct dwarf_filename_struct));
dwarf_line.filename_table[0].dir_entry = 0;
if (undo) {
dwarf_line.filename_table[0].name = tcc_strdup(filename);
dwarf_line.filename_table[1].dir_entry = 1;
dwarf_line.filename_table[1].name = tcc_strdup(undo + 1);
*undo = '/';
dwarf_line.filename_table[0].name = tcc_strdup(filename);
}
else {
dwarf_line.filename_table[0].name = tcc_strdup(filename);
dwarf_line.filename_table[1].dir_entry = 0;
dwarf_line.filename_table[1].name = tcc_strdup(filename);
}
dwarf_line.line_size = dwarf_line.line_max_size = 0;
dwarf_line.line_data = NULL;
dwarf_line.cur_file = 1;
dwarf_line.last_file = 0;
dwarf_line.last_pc = 0;
dwarf_line.last_line = 1;
dwarf_line_op(s1, 0); // extended
dwarf_uleb128_op(s1, 1 + PTR_SIZE); // extended size
dwarf_line_op(s1, DW_LNE_set_address);
for (i = 0; i < PTR_SIZE; i++)
dwarf_line_op(s1, 0);
memset(&dwarf_info.base_type_used, 0, sizeof(dwarf_info.base_type_used));
}
else
{
/* file info: full path + filename */
pstrcat(buf, sizeof(buf), "/");
section_sym = put_elf_sym(symtab_section, 0, 0,
ELFW(ST_INFO)(STB_LOCAL, STT_SECTION), 0,
text_section->sh_num, NULL);
put_stabs_r(s1, buf, N_SO, 0, 0,
text_section->data_offset, text_section, section_sym);
put_stabs_r(s1, filename, N_SO, 0, 0,
text_section->data_offset, text_section, section_sym);
for (i = 0; i < N_DEFAULT_DEBUG; i++)
put_stabs(s1, default_debug[i].name, N_LSYM, 0, 0, 0);
}
/* we're currently 'including' the <command line> */
tcc_debug_bincl(s1);
}
}
/* put end of translation unit info */
ST_FUNC void tcc_debug_end(TCCState *s1)
{
if (!s1->do_debug)
return;
if (s1->dwarf) {
int i, j;
int start_aranges;
unsigned char *ptr;
int text_size = text_section->data_offset;
/* dwarf_info */
for (i = 0; i < n_debug_anon_hash; i++) {
Sym *t = debug_anon_hash[i].type;
int pos = dwarf_info_section->data_offset;
dwarf_data1(dwarf_info_section,
IS_UNION (t->type.t) ? DWARF_ABBREV_UNION_TYPE
: DWARF_ABBREV_STRUCTURE_TYPE);
dwarf_strp(dwarf_info_section,
(t->v & ~SYM_STRUCT) >= SYM_FIRST_ANOM
? "" : get_tok_str(t->v & ~SYM_STRUCT, NULL));
dwarf_uleb128(dwarf_info_section, 0);
dwarf_uleb128(dwarf_info_section, dwarf_line.cur_file);
dwarf_uleb128(dwarf_info_section, file->line_num);
j = dwarf_info_section->data_offset + 5 - dwarf_info.start;
dwarf_data4(dwarf_info_section, j);
dwarf_data1(dwarf_info_section, 0);
for (j = 0; j < debug_anon_hash[i].n_debug_type; j++)
write32le(dwarf_info_section->data +
debug_anon_hash[i].debug_type[j],
pos - dwarf_info.start);
tcc_free (debug_anon_hash[i].debug_type);
}
tcc_free (debug_anon_hash);
dwarf_data1(dwarf_info_section, 0);
ptr = dwarf_info_section->data + dwarf_info.start;
write32le(ptr, dwarf_info_section->data_offset - dwarf_info.start - 4);
write32le(ptr + 25 + (s1->dwarf >= 5) + PTR_SIZE, text_size);
/* dwarf_aranges */
start_aranges = dwarf_aranges_section->data_offset;
dwarf_data4(dwarf_aranges_section, 0); // size
dwarf_data2(dwarf_aranges_section, 2); // version
dwarf_reloc(dwarf_aranges_section, dwarf_sym.info, R_DATA_32DW);
dwarf_data4(dwarf_aranges_section, 0); // dwarf_info
#if PTR_SIZE == 4
dwarf_data1(dwarf_aranges_section, 4); // address size
#else
dwarf_data1(dwarf_aranges_section, 8); // address size
#endif
dwarf_data1(dwarf_aranges_section, 0); // segment selector size
dwarf_data4(dwarf_aranges_section, 0); // padding
dwarf_reloc(dwarf_aranges_section, section_sym, R_DATA_PTR);
#if PTR_SIZE == 4
dwarf_data4(dwarf_aranges_section, 0); // Begin
dwarf_data4(dwarf_aranges_section, text_size); // End
dwarf_data4(dwarf_aranges_section, 0); // End list
dwarf_data4(dwarf_aranges_section, 0); // End list
#else
dwarf_data8(dwarf_aranges_section, 0); // Begin
dwarf_data8(dwarf_aranges_section, text_size); // End
dwarf_data8(dwarf_aranges_section, 0); // End list
dwarf_data8(dwarf_aranges_section, 0); // End list
#endif
ptr = dwarf_aranges_section->data + start_aranges;
write32le(ptr, dwarf_aranges_section->data_offset - start_aranges - 4);
/* dwarf_line */
if (s1->dwarf >= 5) {
dwarf_data1(dwarf_line_section, 1); /* col */
dwarf_uleb128(dwarf_line_section, DW_LNCT_path);
dwarf_uleb128(dwarf_line_section, DW_FORM_line_strp);
dwarf_uleb128(dwarf_line_section, dwarf_line.dir_size);
for (i = 0; i < dwarf_line.dir_size; i++)
dwarf_line_strp(dwarf_line_section, dwarf_line.dir_table[i]);
dwarf_data1(dwarf_line_section, 2); /* col */
dwarf_uleb128(dwarf_line_section, DW_LNCT_path);
dwarf_uleb128(dwarf_line_section, DW_FORM_line_strp);
dwarf_uleb128(dwarf_line_section, DW_LNCT_directory_index);
dwarf_uleb128(dwarf_line_section, DW_FORM_udata);
dwarf_uleb128(dwarf_line_section, dwarf_line.filename_size);
for (i = 0; i < dwarf_line.filename_size; i++) {
dwarf_line_strp(dwarf_line_section,
dwarf_line.filename_table[i].name);
dwarf_uleb128(dwarf_line_section,
dwarf_line.filename_table[i].dir_entry);
}
}
else {
int len;
for (i = 0; i < dwarf_line.dir_size; i++) {
len = strlen(dwarf_line.dir_table[i]) + 1;
ptr = section_ptr_add(dwarf_line_section, len);
memmove(ptr, dwarf_line.dir_table[i], len);
}
dwarf_data1(dwarf_line_section, 0); /* end dir */
for (i = 0; i < dwarf_line.filename_size; i++) {
len = strlen(dwarf_line.filename_table[i].name) + 1;
ptr = section_ptr_add(dwarf_line_section, len);
memmove(ptr, dwarf_line.filename_table[i].name, len);
dwarf_uleb128(dwarf_line_section,
dwarf_line.filename_table[i].dir_entry);
dwarf_uleb128(dwarf_line_section, 0); /* time */
dwarf_uleb128(dwarf_line_section, 0); /* size */
}
dwarf_data1(dwarf_line_section, 0); /* end file */
}
for (i = 0; i < dwarf_line.dir_size; i++)
tcc_free(dwarf_line.dir_table[i]);
tcc_free(dwarf_line.dir_table);
for (i = 0; i < dwarf_line.filename_size; i++)
tcc_free(dwarf_line.filename_table[i].name);
tcc_free(dwarf_line.filename_table);
dwarf_line_op(s1, 0); // extended
dwarf_uleb128_op(s1, 1); // extended size
dwarf_line_op(s1, DW_LNE_end_sequence);
i = (s1->dwarf >= 5) * 2;
write32le(&dwarf_line_section->data[dwarf_line.start + 6 + i],
dwarf_line_section->data_offset - dwarf_line.start - (10 + i));
section_ptr_add(dwarf_line_section, 3);
dwarf_reloc(dwarf_line_section, section_sym, R_DATA_PTR);
ptr = section_ptr_add(dwarf_line_section, dwarf_line.line_size - 3);
memmove(ptr - 3, dwarf_line.line_data, dwarf_line.line_size);
tcc_free(dwarf_line.line_data);
write32le(dwarf_line_section->data + dwarf_line.start,
dwarf_line_section->data_offset - dwarf_line.start - 4);
}
else
{
put_stabs_r(s1, NULL, N_SO, 0, 0,
text_section->data_offset, text_section, section_sym);
}
tcc_free(debug_hash);
}
static BufferedFile* put_new_file(TCCState *s1)
{
BufferedFile *f = file;
/* use upper file if from inline ":asm:" */
if (f->filename[0] == ':')
f = f->prev;
if (f && new_file) {
new_file = last_line_num = 0;
if (s1->dwarf)
dwarf_file(s1);
else
put_stabs_r(s1, f->filename, N_SOL, 0, 0, ind, text_section, section_sym);
}
return f;
}
/* put alternative filename */
ST_FUNC void tcc_debug_putfile(TCCState *s1, const char *filename)
{
if (0 == strcmp(file->filename, filename))
return;
pstrcpy(file->filename, sizeof(file->filename), filename);
if (!s1->do_debug)
return;
if (s1->dwarf)
dwarf_file(s1);