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tccrun.c
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tccrun.c
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/*
* TCC - Tiny C Compiler - Support for -run switch
*
* 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"
/* only native compiler supports -run */
#ifdef TCC_IS_NATIVE
#ifdef CONFIG_TCC_BACKTRACE
/* runtime debug info block */
typedef struct rt_context
{
/* tccelf.c:tcc_add_btstub() wants these in that order: */
union {
struct {
Stab_Sym *stab_sym;
Stab_Sym *stab_sym_end;
char *stab_str;
};
struct {
unsigned char *dwarf_line;
unsigned char *dwarf_line_end;
unsigned char *dwarf_line_str;
};
};
ElfW(Sym) *esym_start;
ElfW(Sym) *esym_end;
char *elf_str;
// 6 * PTR_SIZE
addr_t prog_base;
void *bounds_start;
void *top_func;
struct rt_context *next;
// 10 * PTR_SIZE
int num_callers;
int dwarf;
} rt_context;
/* linked list of rt_contexts */
static rt_context *g_rc;
static int signal_set;
static void set_exception_handler(void);
#endif /* def CONFIG_TCC_BACKTRACE */
typedef struct rt_frame {
addr_t ip, fp, sp;
} rt_frame;
static TCCState *g_s1;
/* semaphore to protect it */
TCC_SEM(static rt_sem);
static void rt_wait_sem(void) { WAIT_SEM(&rt_sem); }
static void rt_post_sem(void) { POST_SEM(&rt_sem); }
static int rt_get_caller_pc(addr_t *paddr, rt_frame *f, int level);
static void rt_exit(rt_frame *f, int code);
/* ------------------------------------------------------------- */
/* defined when included from lib/bt-exe.c */
#ifndef CONFIG_TCC_BACKTRACE_ONLY
#ifndef _WIN32
# include <sys/mman.h>
#endif
static int protect_pages(void *ptr, unsigned long length, int mode);
static int tcc_relocate_ex(TCCState *s1, void *ptr, unsigned ptr_diff);
static void st_link(TCCState *s1);
static void st_unlink(TCCState *s1);
#ifdef CONFIG_TCC_BACKTRACE
static int _tcc_backtrace(rt_frame *f, const char *fmt, va_list ap);
#endif
#ifdef _WIN64
static void *win64_add_function_table(TCCState *s1);
static void win64_del_function_table(void *);
#endif
#if !defined PAGESIZE
# if defined _SC_PAGESIZE
# define PAGESIZE sysconf(_SC_PAGESIZE)
# elif defined __APPLE__
# include <libkern/OSCacheControl.h>
# define PAGESIZE getpagesize()
# else
# define PAGESIZE 4096
# endif
#endif
#define PAGEALIGN(n) ((addr_t)n + (-(addr_t)n & (PAGESIZE-1)))
#if !_WIN32 && !__APPLE__
//#define CONFIG_SELINUX 1
#endif
static int rt_mem(TCCState *s1, int size)
{
void *ptr;
int ptr_diff = 0;
#ifdef CONFIG_SELINUX
/* Using mmap instead of malloc */
void *prw;
char tmpfname[] = "/tmp/.tccrunXXXXXX";
int fd = mkstemp(tmpfname);
unlink(tmpfname);
ftruncate(fd, size);
ptr = mmap(NULL, size * 2, PROT_READ|PROT_EXEC, MAP_SHARED, fd, 0);
/* mmap RW memory at fixed distance */
prw = mmap((char*)ptr + size, size, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, fd, 0);
close(fd);
if (ptr == MAP_FAILED || prw == MAP_FAILED)
return tcc_error_noabort("tccrun: could not map memory");
ptr_diff = (char*)prw - (char*)ptr; /* = size; */
//printf("map %p %p %p\n", ptr, prw, (void*)ptr_diff);
size *= 2;
#else
ptr = tcc_malloc(size += PAGESIZE); /* one extra page to align malloc memory */
#endif
s1->run_ptr = ptr;
s1->run_size = size;
return ptr_diff;
}
/* ------------------------------------------------------------- */
/* Do all relocations (needed before using tcc_get_symbol())
Returns -1 on error. */
LIBTCCAPI int tcc_relocate(TCCState *s1)
{
int size, ret, ptr_diff;
if (s1->run_ptr)
exit(tcc_error_noabort("'tcc_relocate()' twice is no longer supported"));
#ifdef CONFIG_TCC_BACKTRACE
if (s1->do_backtrace)
tcc_add_symbol(s1, "_tcc_backtrace", _tcc_backtrace); /* for bt-log.c */
#endif
size = tcc_relocate_ex(s1, NULL, 0);
if (size < 0)
return -1;
ptr_diff = rt_mem(s1, size);
if (ptr_diff < 0)
return -1;
ret = tcc_relocate_ex(s1, s1->run_ptr, ptr_diff);
if (ret == 0)
st_link(s1);
return ret;
}
ST_FUNC void tcc_run_free(TCCState *s1)
{
unsigned size;
void *ptr;
int i;
/* free any loaded DLLs */
for ( i = 0; i < s1->nb_loaded_dlls; i++) {
DLLReference *ref = s1->loaded_dlls[i];
if ( ref->handle )
#ifdef _WIN32
FreeLibrary((HMODULE)ref->handle);
#else
dlclose(ref->handle);
#endif
}
/* unmap or unprotect and free memory */
ptr = s1->run_ptr;
if (NULL == ptr)
return;
st_unlink(s1);
size = s1->run_size;
#ifdef CONFIG_SELINUX
munmap(ptr, size);
#else
/* unprotect memory to make it usable for malloc again */
protect_pages((void*)PAGEALIGN(ptr), size - PAGESIZE, 2 /*rw*/);
# ifdef _WIN64
win64_del_function_table(s1->run_function_table);
# endif
tcc_free(ptr);
#endif
}
#define RT_EXIT_ZERO 0xE0E00E0E /* passed from longjmp instead of '0' */
/* launch the compiled program with the given arguments */
LIBTCCAPI int tcc_run(TCCState *s1, int argc, char **argv)
{
int (*prog_main)(int, char **, char **), ret;
const char *top_sym;
jmp_buf main_jb;
#if defined(__APPLE__) || defined(__FreeBSD__)
char **envp = NULL;
#elif defined(__OpenBSD__) || defined(__NetBSD__)
extern char **environ;
char **envp = environ;
#else
char **envp = environ;
#endif
/* tcc -dt -run ... nothing to do if no main() */
if ((s1->dflag & 16) && (addr_t)-1 == get_sym_addr(s1, "main", 0, 1))
return 0;
tcc_add_symbol(s1, "__rt_exit", rt_exit);
if (s1->nostdlib) {
s1->run_main = top_sym = "_start";
} else {
tcc_add_support(s1, "runmain.o");
s1->run_main = "_runmain";
top_sym = "main";
}
if (tcc_relocate(s1) < 0)
return -1;
prog_main = (void*)get_sym_addr(s1, s1->run_main, 1, 1);
if ((addr_t)-1 == (addr_t)prog_main)
return -1;
errno = 0; /* clean errno value */
fflush(stdout);
fflush(stderr);
ret = tcc_setjmp(s1, main_jb, tcc_get_symbol(s1, top_sym));
if (0 == ret)
ret = prog_main(argc, argv, envp);
else if (RT_EXIT_ZERO == ret)
ret = 0;
if (s1->dflag & 16 && ret) /* tcc -dt -run ... */
fprintf(s1->ppfp, "[returns %d]\n", ret), fflush(s1->ppfp);
return ret;
}
/* ------------------------------------------------------------- */
/* remove all STB_LOCAL symbols */
static void cleanup_symbols(TCCState *s1)
{
Section *s = s1->symtab;
int sym_index, end_sym = s->data_offset / sizeof (ElfSym);
/* reset symtab */
s->data_offset = s->link->data_offset = s->hash->data_offset = 0;
init_symtab(s);
/* add global symbols again */
for (sym_index = 1; sym_index < end_sym; ++sym_index) {
ElfW(Sym) *sym = &((ElfW(Sym) *)s->data)[sym_index];
const char *name = (char *)s->link->data + sym->st_name;
if (ELFW(ST_BIND)(sym->st_info) == STB_LOCAL)
continue;
//printf("sym %s\n", name);
put_elf_sym(s, sym->st_value, sym->st_size, sym->st_info, sym->st_other, sym->st_shndx, name);
}
}
/* free all sections except symbols */
static void cleanup_sections(TCCState *s1)
{
struct { Section **secs; int nb_secs; } *p = (void*)&s1->sections;
int i, f = 2;
do {
for (i = --f; i < p->nb_secs; i++) {
Section *s = p->secs[i];
if (s == s1->symtab || s == s1->symtab->link || s == s1->symtab->hash) {
s->data = tcc_realloc(s->data, s->data_allocated = s->data_offset);
} else {
free_section(s), tcc_free(s), p->secs[i] = NULL;
}
}
} while (++p, f);
}
/* ------------------------------------------------------------- */
/* 0 = .text rwx other rw (memory >= 2 pages a 4096 bytes) */
/* 1 = .text rx other rw (memory >= 3 pages) */
/* 2 = .text rx .rdata ro .data/.bss rw (memory >= 4 pages) */
/* Some targets implement secutiry options that do not allow write in
executable code. These targets need CONFIG_RUNMEM_RO=1.
The disadvantage of this is that it requires a little bit more memory. */
#ifndef CONFIG_RUNMEM_RO
# ifdef __APPLE__
# define CONFIG_RUNMEM_RO 1
# else
# define CONFIG_RUNMEM_RO 0
# endif
#endif
/* relocate code. Return -1 on error, required size if ptr is NULL,
otherwise copy code into buffer passed by the caller */
static int tcc_relocate_ex(TCCState *s1, void *ptr, unsigned ptr_diff)
{
Section *s;
unsigned offset, length, align, i, k, f;
unsigned n, copy;
addr_t mem, addr;
if (NULL == ptr) {
#ifdef TCC_TARGET_PE
pe_output_file(s1, NULL);
#else
tcc_add_runtime(s1);
resolve_common_syms(s1);
build_got_entries(s1, 0);
#endif
}
offset = copy = 0;
mem = (addr_t)ptr;
redo:
if (s1->verbose == 2 && copy)
printf(&"-----------------------------------------------------\n"[PTR_SIZE*2 - 8]);
if (s1->nb_errors)
return -1;
if (copy == 3)
return 0;
for (k = 0; k < 3; ++k) { /* 0:rx, 1:ro, 2:rw sections */
n = 0; addr = 0;
for(i = 1; i < s1->nb_sections; i++) {
static const char shf[] = {
SHF_ALLOC|SHF_EXECINSTR, SHF_ALLOC, SHF_ALLOC|SHF_WRITE
};
s = s1->sections[i];
if (shf[k] != (s->sh_flags & (SHF_ALLOC|SHF_WRITE|SHF_EXECINSTR)))
continue;
length = s->data_offset;
if (copy == 2) {
if (addr == 0)
addr = s->sh_addr;
n = (s->sh_addr - addr) + length;
continue;
}
if (copy) { /* final step: copy section data to memory */
if (s1->verbose == 2)
printf("%d: %-16s %p len %05x align %04x\n",
k, s->name, (void*)s->sh_addr, length, s->sh_addralign);
ptr = (void*)s->sh_addr;
if (k == 0)
ptr = (void*)(s->sh_addr + ptr_diff);
if (NULL == s->data || s->sh_type == SHT_NOBITS)
memset(ptr, 0, length);
else
memcpy(ptr, s->data, length);
continue;
}
align = s->sh_addralign;
if (++n == 1) {
#if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
/* To avoid that x86 processors would reload cached instructions
each time when data is written in the near, we need to make
sure that code and data do not share the same 64 byte unit */
if (align < 64)
align = 64;
#endif
/* start new page for different permissions */
if (k <= CONFIG_RUNMEM_RO)
align = PAGESIZE;
}
s->sh_addralign = align;
addr = k ? mem + ptr_diff : mem;
offset += -(addr + offset) & (align - 1);
s->sh_addr = mem ? addr + offset : 0;
offset += length;
}
if (copy == 2) { /* set permissions */
if (n == 0) /* no data */
continue;
#ifdef CONFIG_SELINUX
if (k == 0) /* SHF_EXECINSTR has its own mapping */
continue;
#endif
f = k;
if (f >= CONFIG_RUNMEM_RO) {
if (f != 0)
continue;
f = 3; /* change only SHF_EXECINSTR to rwx */
}
n = PAGEALIGN(n);
if (s1->verbose == 2) {
printf("protect %3s %p len %05x\n",
&"rx\0ro\0rw\0rwx"[f*3], (void*)addr, (unsigned)n);
}
if (protect_pages((void*)addr, n, f) < 0)
return tcc_error_noabort(
"mprotect failed (did you mean to configure --with-selinux?)");
}
}
if (0 == mem)
return PAGEALIGN(offset);
if (++copy == 2) {
goto redo;
}
if (copy == 3) {
#ifdef _WIN64
s1->run_function_table = win64_add_function_table(s1);
#endif
/* remove local symbols and free sections except symtab */
cleanup_symbols(s1);
cleanup_sections(s1);
goto redo;
}
/* relocate symbols */
relocate_syms(s1, s1->symtab, !(s1->nostdlib));
/* relocate sections */
#ifdef TCC_TARGET_PE
s1->pe_imagebase = mem;
#else
relocate_plt(s1);
#endif
relocate_sections(s1);
goto redo;
}
/* ------------------------------------------------------------- */
/* allow to run code in memory */
static int protect_pages(void *ptr, unsigned long length, int mode)
{
#ifdef _WIN32
static const unsigned char protect[] = {
PAGE_EXECUTE_READ,
PAGE_READONLY,
PAGE_READWRITE,
PAGE_EXECUTE_READWRITE
};
DWORD old;
if (!VirtualProtect(ptr, length, protect[mode], &old))
return -1;
#else
static const unsigned char protect[] = {
PROT_READ | PROT_EXEC,
PROT_READ,
PROT_READ | PROT_WRITE,
PROT_READ | PROT_WRITE | PROT_EXEC
};
if (mprotect(ptr, length, protect[mode]))
return -1;
/* XXX: BSD sometimes dump core with bad system call */
# if (defined TCC_TARGET_ARM && !TARGETOS_BSD) || defined TCC_TARGET_ARM64
if (mode == 0 || mode == 3) {
void __clear_cache(void *beginning, void *end);
__clear_cache(ptr, (char *)ptr + length);
}
# endif
#endif
return 0;
}
#ifdef _WIN64
static void *win64_add_function_table(TCCState *s1)
{
void *p = NULL;
if (s1->uw_pdata) {
p = (void*)s1->uw_pdata->sh_addr;
RtlAddFunctionTable(
(RUNTIME_FUNCTION*)p,
s1->uw_pdata->data_offset / sizeof (RUNTIME_FUNCTION),
s1->pe_imagebase
);
s1->uw_pdata = NULL;
}
return p;
}
static void win64_del_function_table(void *p)
{
if (p) {
RtlDeleteFunctionTable((RUNTIME_FUNCTION*)p);
}
}
#endif
static void bt_link(TCCState *s1)
{
#ifdef CONFIG_TCC_BACKTRACE
rt_context *rc;
void *p;
if (!s1->do_backtrace)
return;
rc = tcc_get_symbol(s1, "__rt_info");
if (!rc)
return;
rc->esym_start = (ElfW(Sym) *)(symtab_section->data);
rc->esym_end = (ElfW(Sym) *)(symtab_section->data + symtab_section->data_offset);
rc->elf_str = (char *)symtab_section->link->data;
if (PTR_SIZE == 8 && !s1->dwarf)
rc->prog_base &= 0xffffffff00000000ULL;
#ifdef CONFIG_TCC_BCHECK
if (s1->do_bounds_check) {
if ((p = tcc_get_symbol(s1, "__bound_init")))
((void(*)(void*,int))p)(rc->bounds_start, 1);
}
#endif
rc->next = g_rc, g_rc = rc, s1->rc = rc;
if (0 == signal_set)
set_exception_handler(), signal_set = 1;
#endif
}
static void st_link(TCCState *s1)
{
rt_wait_sem();
s1->next = g_s1, g_s1 = s1;
bt_link(s1);
rt_post_sem();
}
/* remove 'el' from 'list' */
static void ptr_unlink(void *list, void *e, unsigned next)
{
void **pp, **nn, *p;
for (pp = list; !!(p = *pp); pp = nn) {
nn = (void*)((char*)p + next); /* nn = &p->next; */
if (p == e) {
*pp = *nn;
break;
}
}
}
static void st_unlink(TCCState *s1)
{
rt_wait_sem();
#ifdef CONFIG_TCC_BACKTRACE
ptr_unlink(&g_rc, s1->rc, offsetof(rt_context, next));
#endif
ptr_unlink(&g_s1, s1, offsetof(TCCState, next));
rt_post_sem();
}
LIBTCCAPI void *_tcc_setjmp(TCCState *s1, void *p_jmp_buf, void *func, void *p_longjmp)
{
s1->run_lj = p_longjmp;
s1->run_jb = p_jmp_buf;
#ifdef CONFIG_TCC_BACKTRACE
if (s1->rc)
s1->rc->top_func = func;
#endif
return p_jmp_buf;
}
LIBTCCAPI void tcc_set_backtrace_func(TCCState *s1, void *data, TCCBtFunc *func)
{
s1->bt_func = func;
s1->bt_data = data;
}
static TCCState *rt_find_state(rt_frame *f)
{
TCCState *s;
int level;
addr_t pc;
s = g_s1;
if (NULL == s || NULL == s->next) {
/* play it safe in the simple case when there is only one state */
return s;
}
for (level = 0; level < 8; ++level) {
if (rt_get_caller_pc(&pc, f, level) < 0)
break;
for (s = g_s1; s; s = s->next) {
if (pc >= (addr_t)s->run_ptr
&& pc < (addr_t)s->run_ptr + s->run_size)
return s;
}
}
return NULL;
}
static void rt_exit(rt_frame *f, int code)
{
TCCState *s;
rt_wait_sem();
s = rt_find_state(f);
rt_post_sem();
if (s && s->run_lj) {
if (code == 0)
code = RT_EXIT_ZERO;
((void(*)(void*,int))s->run_lj)(s->run_jb, code);
}
exit(code);
}
/* ------------------------------------------------------------- */
#else // if defined CONFIG_TCC_BACKTRACE_ONLY
static void rt_exit(rt_frame *f, int code)
{
exit(code);
}
#endif //ndef CONFIG_TCC_BACKTRACE_ONLY
/* ------------------------------------------------------------- */
#ifdef CONFIG_TCC_BACKTRACE
static int rt_vprintf(const char *fmt, va_list ap)
{
int ret = vfprintf(stderr, fmt, ap);
fflush(stderr);
return ret;
}
static int rt_printf(const char *fmt, ...)
{
va_list ap;
int r;
va_start(ap, fmt);
r = rt_vprintf(fmt, ap);
va_end(ap);
return r;
}
static char *rt_elfsym(rt_context *rc, addr_t wanted_pc, addr_t *func_addr)
{
ElfW(Sym) *esym;
for (esym = rc->esym_start + 1; esym < rc->esym_end; ++esym) {
int type = ELFW(ST_TYPE)(esym->st_info);
if ((type == STT_FUNC || type == STT_GNU_IFUNC)
&& wanted_pc >= esym->st_value
&& wanted_pc < esym->st_value + esym->st_size) {
*func_addr = esym->st_value;
return rc->elf_str + esym->st_name;
}
}
return NULL;
}
typedef struct bt_info
{
char file[100];
int line;
char func[100];
addr_t func_pc;
} bt_info;
/* print the position in the source file of PC value 'pc' by reading
the stabs debug information */
static addr_t rt_printline (rt_context *rc, addr_t wanted_pc, bt_info *bi)
{
char func_name[128];
addr_t func_addr, last_pc, pc;
const char *incl_files[INCLUDE_STACK_SIZE];
int incl_index, last_incl_index, len, last_line_num, i;
const char *str, *p;
Stab_Sym *sym;
func_name[0] = '\0';
func_addr = 0;
incl_index = 0;
last_pc = (addr_t)-1;
last_line_num = 1;
last_incl_index = 0;
for (sym = rc->stab_sym + 1; sym < rc->stab_sym_end; ++sym) {
str = rc->stab_str + sym->n_strx;
pc = sym->n_value;
switch(sym->n_type) {
case N_SLINE:
if (func_addr)
goto rel_pc;
case N_SO:
case N_SOL:
goto abs_pc;
case N_FUN:
if (sym->n_strx == 0) /* end of function */
goto rel_pc;
abs_pc:
#if PTR_SIZE == 8
/* Stab_Sym.n_value is only 32bits */
pc += rc->prog_base;
#endif
goto check_pc;
rel_pc:
pc += func_addr;
check_pc:
if (pc >= wanted_pc && wanted_pc >= last_pc)
goto found;
break;
}
switch(sym->n_type) {
/* function start or end */
case N_FUN:
if (sym->n_strx == 0)
goto reset_func;
p = strchr(str, ':');
if (0 == p || (len = p - str + 1, len > sizeof func_name))
len = sizeof func_name;
pstrcpy(func_name, len, str);
func_addr = pc;
break;
/* line number info */
case N_SLINE:
last_pc = pc;
last_line_num = sym->n_desc;
last_incl_index = incl_index;
break;
/* include files */
case N_BINCL:
if (incl_index < INCLUDE_STACK_SIZE)
incl_files[incl_index++] = str;
break;
case N_EINCL:
if (incl_index > 1)
incl_index--;
break;
/* start/end of translation unit */
case N_SO:
incl_index = 0;
if (sym->n_strx) {
/* do not add path */
len = strlen(str);
if (len > 0 && str[len - 1] != '/')
incl_files[incl_index++] = str;
}
reset_func:
func_name[0] = '\0';
func_addr = 0;
last_pc = (addr_t)-1;
break;
/* alternative file name (from #line or #include directives) */
case N_SOL:
if (incl_index)
incl_files[incl_index-1] = str;
break;
}
}
last_incl_index = 0, func_name[0] = 0, func_addr = 0;
found:
i = last_incl_index;
if (i > 0) {
pstrcpy(bi->file, sizeof bi->file, incl_files[--i]);
bi->line = last_line_num;
}
pstrcpy(bi->func, sizeof bi->func, func_name);
bi->func_pc = func_addr;
return func_addr;
}
/* ------------------------------------------------------------- */
/* rt_printline - dwarf version */
#define DIR_TABLE_SIZE (64)
#define FILE_TABLE_SIZE (512)
#define dwarf_ignore_type(ln, end) /* timestamp/size/md5/... */ \
switch (entry_format[j].form) { \
case DW_FORM_data1: (ln) += 1; break; \
case DW_FORM_data2: (ln) += 2; break; \
case DW_FORM_data4: (ln) += 3; break; \
case DW_FORM_data8: (ln) += 8; break; \
case DW_FORM_data16: (ln) += 16; break; \
case DW_FORM_udata: dwarf_read_uleb128(&(ln), (end)); break; \
default: goto next_line; \
}
static addr_t rt_printline_dwarf (rt_context *rc, addr_t wanted_pc, bt_info *bi)
{
unsigned char *ln;
unsigned char *cp;
unsigned char *end;
unsigned char *opcode_length;
unsigned long long size;
unsigned int length;
unsigned char version;
unsigned int min_insn_length;
unsigned int max_ops_per_insn;
int line_base;
unsigned int line_range;
unsigned int opcode_base;
unsigned int opindex;
unsigned int col;
unsigned int i;
unsigned int j;
unsigned int len;
unsigned long long value;
struct {
unsigned int type;
unsigned int form;
} entry_format[256];
unsigned int dir_size;
#if 0
char *dirs[DIR_TABLE_SIZE];
#endif
unsigned int filename_size;
struct /*dwarf_filename_struct*/ {
unsigned int dir_entry;
char *name;
} filename_table[FILE_TABLE_SIZE];
addr_t last_pc;
addr_t pc;
addr_t func_addr;
int line;
char *filename;
char *function;
filename = NULL;
function = NULL;
func_addr = 0;
line = 0;
ln = rc->dwarf_line;
while (ln < rc->dwarf_line_end) {
dir_size = 0;
filename_size = 0;
last_pc = 0;
pc = 0;
func_addr = 0;
line = 1;
filename = NULL;
function = NULL;
length = 4;
size = dwarf_read_4(ln, rc->dwarf_line_end);
if (size == 0xffffffffu) // dwarf 64
length = 8, size = dwarf_read_8(ln, rc->dwarf_line_end);
end = ln + size;
if (end < ln || end > rc->dwarf_line_end)
break;
version = dwarf_read_2(ln, end);
if (version >= 5)
ln += length + 2; // address size, segment selector, prologue Length
else
ln += length; // prologue Length
min_insn_length = dwarf_read_1(ln, end);
if (version >= 4)
max_ops_per_insn = dwarf_read_1(ln, end);
else
max_ops_per_insn = 1;
ln++; // Initial value of 'is_stmt'
line_base = dwarf_read_1(ln, end);
line_base |= line_base >= 0x80 ? ~0xff : 0;
line_range = dwarf_read_1(ln, end);
opcode_base = dwarf_read_1(ln, end);
opcode_length = ln;
ln += opcode_base - 1;
opindex = 0;
if (version >= 5) {
col = dwarf_read_1(ln, end);
for (i = 0; i < col; i++) {
entry_format[i].type = dwarf_read_uleb128(&ln, end);
entry_format[i].form = dwarf_read_uleb128(&ln, end);
}
dir_size = dwarf_read_uleb128(&ln, end);
for (i = 0; i < dir_size; i++) {
for (j = 0; j < col; j++) {
if (entry_format[j].type == DW_LNCT_path) {
if (entry_format[j].form != DW_FORM_line_strp)
goto next_line;
#if 0
value = length == 4 ? dwarf_read_4(ln, end)
: dwarf_read_8(ln, end);
if (i < DIR_TABLE_SIZE)
dirs[i] = (char *)rc->dwarf_line_str + value;
#else
length == 4 ? dwarf_read_4(ln, end)
: dwarf_read_8(ln, end);
#endif
}
else
dwarf_ignore_type(ln, end);
}
}
col = dwarf_read_1(ln, end);
for (i = 0; i < col; i++) {
entry_format[i].type = dwarf_read_uleb128(&ln, end);
entry_format[i].form = dwarf_read_uleb128(&ln, end);
}
filename_size = dwarf_read_uleb128(&ln, end);
for (i = 0; i < filename_size; i++)
for (j = 0; j < col; j++) {
if (entry_format[j].type == DW_LNCT_path) {
if (entry_format[j].form != DW_FORM_line_strp)
goto next_line;
value = length == 4 ? dwarf_read_4(ln, end)
: dwarf_read_8(ln, end);
if (i < FILE_TABLE_SIZE)
filename_table[i].name =
(char *)rc->dwarf_line_str + value;
}
else if (entry_format[j].type == DW_LNCT_directory_index) {
switch (entry_format[j].form) {
case DW_FORM_data1: value = dwarf_read_1(ln, end); break;
case DW_FORM_data2: value = dwarf_read_2(ln, end); break;
case DW_FORM_data4: value = dwarf_read_4(ln, end); break;
case DW_FORM_udata: value = dwarf_read_uleb128(&ln, end); break;
default: goto next_line;
}
if (i < FILE_TABLE_SIZE)
filename_table[i].dir_entry = value;
}
else
dwarf_ignore_type(ln, end);
}
}
else {
while ((dwarf_read_1(ln, end))) {
#if 0
if (++dir_size < DIR_TABLE_SIZE)
dirs[dir_size - 1] = (char *)ln - 1;
#endif
while (dwarf_read_1(ln, end)) {}
}
while ((dwarf_read_1(ln, end))) {
if (++filename_size < FILE_TABLE_SIZE) {
filename_table[filename_size - 1].name = (char *)ln - 1;
while (dwarf_read_1(ln, end)) {}
filename_table[filename_size - 1].dir_entry =
dwarf_read_uleb128(&ln, end);
}
else {
while (dwarf_read_1(ln, end)) {}
dwarf_read_uleb128(&ln, end);
}
dwarf_read_uleb128(&ln, end); // time
dwarf_read_uleb128(&ln, end); // size
}
}
if (filename_size >= 1)
filename = filename_table[0].name;
while (ln < end) {
last_pc = pc;
i = dwarf_read_1(ln, end);
if (i >= opcode_base) {
if (max_ops_per_insn == 1)
pc += ((i - opcode_base) / line_range) * min_insn_length;
else {
pc += (opindex + (i - opcode_base) / line_range) /
max_ops_per_insn * min_insn_length;
opindex = (opindex + (i - opcode_base) / line_range) %
max_ops_per_insn;
}
i = (int)((i - opcode_base) % line_range) + line_base;
check_pc:
if (pc >= wanted_pc && wanted_pc >= last_pc)
goto found;
line += i;
}
else {
switch (i) {
case 0:
len = dwarf_read_uleb128(&ln, end);
cp = ln;
ln += len;
if (len == 0)
goto next_line;
switch (dwarf_read_1(cp, end)) {
case DW_LNE_end_sequence:
break;
case DW_LNE_set_address:
#if PTR_SIZE == 4
pc = dwarf_read_4(cp, end);
#else
pc = dwarf_read_8(cp, end);
#endif
#if defined TCC_TARGET_MACHO
pc += rc->prog_base;
#endif
opindex = 0;
break;
case DW_LNE_define_file: /* deprecated */
if (++filename_size < FILE_TABLE_SIZE) {
filename_table[filename_size - 1].name = (char *)ln - 1;
while (dwarf_read_1(ln, end)) {}
filename_table[filename_size - 1].dir_entry =
dwarf_read_uleb128(&ln, end);
}
else {
while (dwarf_read_1(ln, end)) {}
dwarf_read_uleb128(&ln, end);
}
dwarf_read_uleb128(&ln, end); // time
dwarf_read_uleb128(&ln, end); // size
break;
case DW_LNE_hi_user - 1:
function = (char *)cp;
func_addr = pc;
break;
default: