Add the define TCC_CUT_ON_INTEGER_LITERAL_OVERFLOW to use the most
significant digits of an integer literal before its parsing led to an
overflow.
When compiling tcc with another compiler, which is not able to handle
64 bit arithmetic, it is beneficial to use the last value before an
integer literal overflows. Parsing 0x1000000000000000 then results in
0x10000000. The mescc from GNU Mes is able to compile a first tcc on a
32 bit system without 64 bit arithmetic. This change allows this first
tcc to compile a second tcc with complete 64 bit arithmetic.
tcc.h, tccgen.c:
Add and use IS_BT_ARRAY
tccpp.c:
free memory when size is 0 in realloc code
tccdbg.c:
move common code to seperate function remove_type_info
- include/stddef.h, tcctest.c
Revert "tests/tcctest.c: include stdint.h"
This reverts commit 8f23997ca7
We don't want tcctest.c to rely on system include files
- libtcc.c:
Revert "libtcc.c: Remove unused defines free and realloc"
To be unused is the point why they do exist
This reverts commit 2f88764100.
- tcc.c:
fix formatting of commit e73529865d
- tccpp.c:
parse_include(): print skipped include files too (with tcc -vv[v] file)
next_nomacro(): faster L"str" parsing
- tccgen.c: fix c2y if declaration:
* accept like GCC: if (int a = 0, b, c = x; c)
* accept as "TCC extension": if (int a = 0, b, c = x)
* "speak tcc" with symbol/function names
- README:
cleanup
int foo(struct xxx {int x[3];} *p) { ...
We want 'xxx' be visible only inside the function. To get that,
the patch removes the 'sym_push(param)' in xxx-gen.c, and instead
(in tccgen.c:gen_function()) pushes all symbols that were newly
defined during parsing of the parameter list in post_type().
Also,
- decl_initializer_alloc():
patch existing globals earlier, which updates flex arrays too
- let patch_type() do the 'redefinition' check and FUNC_OLD update
tcc.c:
- be nice to leak checkers
tcctools.c:
- remove unused TCCState params
tccrun.c:
- call bound_exit() after signals to let it free mem
tccelf.c:
- use section_add() instead of section_ptr_add() when
more appropriate
tccpp.c:
- use size_t to align tal_header naturally
- 'POINTER_SIZE' and 'PTR_SIZE' in the same source is confusing
- "char file_name[TAL_DEBUG_FILE_LEN + 1];" looks silly.
- next_nomacro(): skip UTF8 BOM at BOF
tccgen.c:
- get rid of STMT_EXPR clause on top of block
- warn with useless type like 'int;'
- move skip()'s in block() for better error line-info
- BIT_SIZE bits are meaningful only with VT_BITFIELD
(not with enums for example)
workflow/test-win32:
- build with MSVC using build-tcc.bat also
alloca.S:
- fix 'off by one' problem on win32 (must touch current page
too because the 'push %edx' at the end could touch the next page)
- must not align greater than 4 when used for struct args
(i386-gen.c:gfunc_call())
libtcc.c:
- accept -g1dwarf (dwarf output, only line info)
arm-link.c: remove some casts
tccelf.c: code style and remove code
tccpp.c: use correct pointer size so cross compiling works
riscv64-gen.c: make code more readable
Tested code with:
clang -fsanitize=address,undefined,nullability -pie -fPIE -Iinclude -I. -g tcc.c -o tcc.tcc -lm -ldl -lpthread
./tcc.tcc -Iinclude -I. -b -g tcc.c -o tcc.tcc1 -lm -ldl -lpthread
Also checked on i386/x86_64 with -fsanitize=memory (others not supported).
arm-link.c: use read32le/write32le/add32le to avoid unaligned access
tcc.h i386-asm.c: fix signed left shift
lib/bcheck.c: Add _Atomic
libtcc.c: Correct MEM_DEBUG_CHECK3 to avoid unaligned access
riscv64-link.c: Fix R_RISCV_SET16
tccpp.c: Align tal_header_t to avoid unaligned access
tccgen.c x86_64-gen.c: avoid use of uninitialized value
There are still warnings reported:
tccgen.c:4031:13: runtime error: member access within null pointer of type 'TCCState' (aka 'struct TCCState')
tccelf.c:321:22: runtime error: applying zero offset to null pointer
tccelf.c:1132:23: runtime error: applying non-zero offset 169184 to null pointer
A lot of left shift of negative value warnings.
I ignored these for the moment.
Also the -run option does no work well with -fsanitize. It gets confused
because it does not detect that the generated code in memory is used
without -fsanitize option.
There are a lot more -fsanitize options. I did not find serious problems
with them.
workflows/build.yml:
- win32/64: install mingw32/64 gcc on msys (because the default
gcc installed elsewhere seems to use ucrt, producing incompatible
fp printf formats.)
tccgen.c:
- cleanup funcs: save any lvalues from return expressions. Also use
get_temp_local_var() which however was causing a problem on i386
because its gfunc_call() removes the arguments from vstack and by
that defeats the 'in-use' tracking of get_temp_local_var(). Fixed by:
i386/arm/arm64/x86_64-gen.c:
- in gfunc_call(): save_regs before anything else, fixes
problems seen in arm64/i386
tccpp.c:
- allow arm asm specific use of '#' in macros
libtcc.c:
- organize -M options, and:
tccpe.c:
- move the subsystem option parsing from libtcc.c
tccelf.c:
- improved error handling in tcc_load_ldscript()
lib/atomic.S:
- TCC_TARGET_... not defined when building the lib
- endbrNN security feature not supported by TCC
tests/tests2/136_atomic_gcc_style.c:
- never use standard assert() in tests
cleanup libtcc.c:tcc_set_linker()
cleanup tccelf.c:tcc_load_ldscript()
Also
- tccrun.c, tccelf.c:relocate_syms():
with tcc -run -nostdlib, do resolve but only from explicitly
on the command-line given libraries.
- tccgen.c: optimize UMOD x % c -> x & (c-1) for c = 2^n
- tcc-doc.texi: cleanup
- tcc.h, tccpp.c, libtcc.c: add 'size' arg to pstrncpy()
Also reorder functions in libtcc.c a bit.
9 files changed, 556 insertions(+), 617 deletions(-)
Aka 'intmax_t', as recommended by newer standards.
For example
if (-0x80000000 < 0) is false,
but
#if (-0x80000000 < 0) is true
because in C, 0x80000000 is an unsigned int, Whereas in
a preprocessor expression, it is a signed long long, even
without LL suffix.
arm-asm.c: add forward branches & some ops
lib/armeabi.c: faster i/udivmod (asm)
arm-gen.c: use movw/movt to load constants for CPUVER >= 70
configure: use dwarf-4 debug sections on android, detect idiv
lib/Makefile: always add -I$(TOP) for access to config.h
tcdbg.c: add a "code mapping symbol" to help out llvm-objdump
tccelf.c: don't load SHT_ARM_EXIDX, modify ARM.attributes
tccpp.c: accept '@' for arm asm comments
libtcc.c:
- free 'elfint' string
- acceot -O and -Os
- accept -gstabs (to override dwarf when default)
- better -Wp,...
tccpp.c:
- #line cleanup
also warn with "extra tokens after directive"
tccgen.c & xxx_gen.c:
- force CPU flags to register earlier
tccelf.c:
- tcc_load_object: align size only for code sections
data/bss objects are always put with their specfic type align
(in decl_initializer_alloc())
x86/64 doesn't need aligned code
from c6afdff7ab
tccpe.c:
- enable dllimport for "_imp__<sym>" also from assembler
x86_64-gen.c & lib/libtcc1.c:
- simpler fneg without libtcc1 reference
tests2/134_double_to_signed.c:
- a tcc compiled by msvc won't pass this test
Put former NATIVE_DEFINES into config.h. Such tcc can be run
and tested directly from source more easily, like for example:
tcc -run tcc.c -B. -run test.c
Also:
- tccelf.c: cleanup
- tccpp.c: avoid stupid clang warning
- configure: reduce -Wno- switches
- tcc.h: inline wait/post_sem()
- tccpe.c: simplify import (assume STT_NOTYPE is function)
with -Wl,-oformat=binary, executable code should come first.
(for linux kernel image for example)
Also:
- simplify RELRO sections: create them as readonly, but add
SHF_WRITE flag later when needed (i.e. relocations do exist)
- tcc.h etc: exclude eh_frames on non-elf platforms
- tccelf.c:tcc_load_object_file(): don't load debug sections when
linking without -g (special dwarf case in relocate_section()
wont work when dwlo/hi were not initialized).
- tcc.c: avoid loop if something fails (ret < 0) without message
(while failing without message should not happen either)
- tccelf.c:tcc_load_alacarte: give message
- tccpp.c: treat '# 123xyz' in asm file as comment
- lib/Makefile: cleanup
- libtcc.c: tcc_add_library(): fallback to try filename as is
(also remove tcc_add_library_err())
- tccgen.c: cleanup switch data etc. after errors (*)
- tccpe.c: faster get_dllexports (*)
- tccpe.c: support -Wl,-e[ntry]=... (*)
- libtcc.c: win32: use ANSI functions (GetModuleFileNameA etc.)
- tccrun.c: be nice to tcc-0.9.26 ("struct/enum already defined")
- tccpp.c: be nice to tcc-0.9.27's va_start/end macros
(*) suggested by Robert Schlicht
https://lists.gnu.org/archive/html/tinycc-devel/2024-03/msg00012.html
- remove TOK_NOSUBST, mark the token itself instead
- get_tok_str(); mask out SYM_FIELD & update uses
- next(): optimize (~5% faster with tcc -E)
- tok_flags: remove some redundancy
- parse_define(): do not remove spaces around '##' and after '#'
and mark macros with '##' as MACRO_JOIN to avoid unnecessary
call to macro_twosharps(mstr):
- next_nomacro(): removed, next_nomacro1(): renamed to next_nomacro()
- next_argstream(): cleanup & new function peek_file()
- macro_subst_tok(): handle special macros (__DATE__ etc.)
like normal macros if they are #defined
- -DPP_DEBUG : more structured output
- pp_error(): better preprocessor expression error message
- tcctok.h: sort basic keywords (somehow)
- testspp/Makefile: generate .expect with 'make testspp.##+'
- tcc.c: tcc -E -o file : put unixy LFs also on windows
tccpp.c:
- revert "Preprocessor fix + new testcase"
Fix was not a fix and nobody could understand the test.
This reverts 6379f2ee76
- better fix and add new test (pp/18.c)
tccgen.c:
- remove global variables 'in_sizeof', 'constant_p'
- rework comma expression (gexpr())
- merge func/data 'alias_target' codes
(See 08c777053c)
- move call to do_Static_assert()
- better error: "expression expected before '%s'"
- fix "statement after label"
- remove unnecessary second parameter to block()
- remove unnecessary call to decl()
- revert changes to old C89 test file
See 7f0a28f6ca
tccelf.c:
- rework "...make undefined global symbol STT_NOTYPE"
(See f44060f8fc)
- move tccelf_add_crtbegin() from libtcc.c
tcctest:
- unfix K&R fix (keep old look of K&R functions)
tccrun.c:
- exit(0) returns 0
libtcc.c:
- move #defines for -dumpmachine
- more explicit error "file not found"
(as opposed to error while loading file)
tccpe.c, x86_64-gen.c, i386-asm.c, tccasm.c:
- use R_X86_64_PLT32 for functions on x86_64-win32
tccdefs.h
- empty #defines for _Nonnull, __has_builtin(), etc.
configure:
- Simpler "macOS .dylib ... VERSION letters."
(See 6b967b1285)
Makefile:
- macOS version also
- add cross searchpaths for packages
build.yml:
- disable codesign on macos-11 (doesn't seem to work)
echo "void bugged() { do {} }" | tcc -run -
now produces the sensible: -:1: error: 'while' expected (got "}")
I believe (but am far from sure) that the additional use of &tokc is ok.
libtcc.c:
- revert "Small patch to allow..." (someone's personal easteregg)
(see da3a763e97)
- check return value from macho_load_tbd/dylib
tcc.c:
- remove help for "not yet implemented" option
tccelf.c:
- check PIE's for "unresolved symbols"
tccgen.c:
- avoid int->double->int cast
(see a46372e910)
- fix constant propagation with pseudo long doubles
(must mask out VT_LONG from type)
- cleanup find_field() (again)
tccpp.c:
- disallow strings and double constants in #if expressions
win32/include/uchar.h:
- change file mode
In order to detect a "same file" faster, this makes one
restriction to the feature: the basenames are required to
match at least (as in "test.h" and "dir/../test.h")
Also remove obsolete 'pp_once' (cached includes do not persist
across compilations anymore anyway)
This rewrites commits
30fd24abd44e363a1728
3 files changed, 38 insertions(+), 74 deletions(-)
pragma once can now be used with
test.h
./test.h
and other references to the same file just like gcc/clang.
On linux we can use stat and st_ino to check for the same file.
On windows the st_ino does not work so we calculate a file hash
if the size of the file differs and then compare the hash.
avoid memory leaks with lost CStrings on stack after errors.
tccpp.c:
- use/abuse static Cstring tokcstr where possible
tccgen.c:
- use/abuse static Cstring initstr where possible
tcc.h/libtcc.a:
- add 'stk_data' array to track memory pointer on stack
- add macros stk_push/pop() and cstr_new/free_s()
tccasm.c:
- use that
- use char[16] instead of char* for op.constraint
tccgen.c:
- allow cross-compiling 0.0L (cross-compile tcc with tcc)
tccelf.c:
- use alignment of TLS section for PT_TLS
tccpp.c:
- support long double constants on systems that do not support
long doubles (i.e. mark them (VT_DOUBLE | VT_LONG))
tccdefs.h:
#define __has_feature() for android
remove _unaligned (why define a msvc extension under !_WIN32)
tccgen.c:
- just track local_stack for small scopes (can't declare variables)
- fix a vla problem with nested scopes
- move debug N_L/RBRAC into curly braced block
Also:
- tccpp.c: move 'label_...' functions to tccgen.c
- tccpp.c: let get_tok_str() say "<no name>" for anonymous symbols
- tcctest.c: let __pa_symbol() work for memory > 2GB
- 119_random_stuff.c: revert strtoll test (no reason to test libc)
- tccdefs.h/tcctest.c: enable bit fncs for _WIN32
- Makefile:
- use i686-linux-gnu instead of i386-linux-gnu for cross-i386
- update 'make help'
- revert umplicit 'make all' with 'make install' (but print warning)
(As long as it is in the default install location and was not
moved elsewhere into the library search path manually)
Also:
- libtcc.c:
- error1(): show correct line with "In file included from ..."
- support "tcc -Bxxx -vv"
- tcc_new()/tcc_compile(): Don't create elf sections for tcc -E
- tccdbg.c:
- tcc -E -g : revert 1de025c13a
Let's keep things simple, everybody understands 'do_debug'
and dState is set by tcov too (but no debug sections).
- tccgen.c:
- avoid the extra parameter for gind()
(from c3e3a07ed4)
- vla func params: use skip_or_save_block() and enable
VT_LVAL (see 313855c232)
- cleanup nocode_wanted a bit
- tccelf.c:
- tccelf_end_file(): don't try to translate zero-sym relocs
(seems to happen with asm "jmp 0x1000")
- version_add(): do not make "ld-linux.so" DT_NEEDED
- also simplify parse(_line)_comment() and parse_pp_string()
- fixes a continuation problem in strings (see tcctest.c)
- no differences in performance could be observed
161 insertions(+), 246 deletions(-), less 85 lines
- make only one function from previously four pieces
- use parse_pp_string() for the normal cases "..." and <...>
- use the sanity check for computed include as end-condition too.
- use 's1' instead of 'tcc_state' when possible
117 insertions(+), 165 deletions(-), less 48 lines
