Move the TinyCC/Windows ARM64 Interlocked workaround from the semlock call site into the bundled WinAPI header. This keeps tcc.h using the normal Interlocked API while avoiding unresolved Interlocked imports when tcc -run self-compiles on Windows ARM64.
Update lib/bt-exe.c as well so its ARM64 runtime object does not define a second InterlockedExchange fallback now provided by winnt.h.
- tccmacho.c: add STT_TLS to convert_symbol() for Mach-O output
- tests/tests2/Makefile: skip 144_tls on Win32 (no pthread.h) and
remove arm from TLS arch list (QEMU user-mode cannot emulate
MRC p15 TLS register access)
Replace raw-register AMO asm with proper inline-asm constraints
for all three operands (rd, rs2, rs1). Use long long for .d-word
AMO variants with pre-set values (xd=0xCAFEBABECAFEBABE,
val=0xDEADBEEFDEADBEEF) to avoid uninitialized-data issues.
Restore csr_pseudo_main printf output and re-enable amo_main()
in the test (was commented out as 'crash on qemu').
Use GEN = $(GEN-TCC) since GCC and TCC produce different fcsr
initial values on riscv64.
Revert 199369bb17
- generating test.ref with tcc makes little sense.
- combine riscv_asm & conversion tests into only two files.
(too many files are bad ...)
tccgen.c:
- init_putv(): improve long double cross constants
now in separate function including some basic conversions
arm-gen.c:
- switch to using TCC_USING_DOUBLE_FOR_LDOUBLE
now it actually never will see VT_LDOUBLE
lib/lib-arm64.c:
- simplify by using unions
tccpp.c:
- reduce amounts of #ifdef TCC_USING_DOUBLE_FOR_LDOUBLE
originally, this was meant to avoid 'void' values leak
to the gen-xxx.c generators which would otherwise try
to load void from/to registers. Also catch invalid types
such as 'unsigned bool' eariler.
tccgen.c:
- expr_cond()/gexpr(): ignore VT_VOID
- gen_cast(): set float reg with static initializers to make
backends happier with invalid input
- init_putv():
improve static compound literal initializers
Also:
- ignore "missing prototype" and "might return no value"
for old style K&R functions
tcc.c, libtcc.c:
- tcc_set_output_type(): return errors from loading crt1.o
tcc.h/tccpp.c:
- fix horrible longstanding mistake with sizeof SValue.tab.
Must have place for sizeof (long double) rather than the
target's LDOUBLE_SIZE.
tccdefs.h:
- add a fake __[u]int128_t for all platforms
arm-gen.c:
- gen_cvt_ftof() must load to reg always
arm64-gen.c:
- simplify arm64_pcs() a bit
i386/x86_64-gen.c:
- do not assume char is signed (for cross compilation arm->x86)
tccelf/macho linker message:
- instead of
"undefined symbol 'X'"
now say
"unresolved reference to 'X'"
which makes it more clear that it is a _linker_error_.
tccasm.c:
- .align/p2align: use 'nop's in exec sections
Add handlers for csrr, csrw, csrwi, csrsi, csrci as pseudo-instructions:
csrr rd, csr -> csrrs rd, csr, x0
csrw csr, rs -> csrrw x0, csr, rs
csrwi csr, uimm -> csrrwi x0, csr, uimm
csrsi csr, uimm -> csrrsi x0, csr, uimm
csrci csr, uimm -> csrrci x0, csr, uimm
Tokens were already defined in riscv64-tok.h. Tested on
Spacemit X100 using fcsr (0x003) which is accessible in user mode.
cycle/instret CSRs are privileged and not accessible from Linux
user mode on this hardware.
The promote char/short funcret test in tcctest.c invokes
undefined behavior (narrow return without extension). GCC
produces one set of values, TCC with PROMOTE_RET produces
correct ABI-compliant values. Generate the reference with
TCC so self-tests are consistent.
Adds the 8 most essential floating-point arithmetic instructions:
fadd.s/d, fsub.s/d, fmul.s/d, fdiv.s/d, for both single and double
precision. These complement the existing fsgnj/fmax/fmin/fsqrt set.
Comparison (feq/flt/fle) and conversion (fcvt) instructions remain
as future work.
sext.w: addiw rd, rs, 0 (sign-extend 32-bit word)
fmv.s/fmv.d: fsgnj.s/d rd, rs, rs (float register move)
fneg.s/fneg.d: fsgnjn.s/d rd, rs, rs (float register negate)
These were defined in riscv64-tok.h but had no handler code.
CSR pseudo-instructions (csrr, csrw, csrci, csrsi, csrwi) skipped
for now — they require CSR operand parsing in binary mode.
On RV64, long long (64-bit) fits in a single general-purpose register.
The existing load/store calls already handle 64-bit values correctly.
The 'not implemented' errors were vestigial from 32-bit architectures
where long long requires a register pair.
Removing these errors allows inline asm to accept 64-bit integer operands
on RV64, which is important since this is the native register width.
Replaces the empty stub that relied on 'RV64 registers are always
sign-extended' assumption. Now emits addiw rd, rs, 0 for proper
32-to-64 bit sign extension, matching arm64's sxtw behavior.
Verified on Spacemit X100: tests2 pass (125_atomic_misc has a
pre-existing intermittent segfault, not caused by this change).
Add sign/zero extension for char/short to int casts using
slli+srai (signed) or slli+srli/andi (unsigned) sequences.
Also adds RISCV64 to the gen_cvt_csti fast-path conditional
in tccgen.c:3466, matching arm64/i386/x86_64.
Verified on Spacemit X100: all tests2 pass, no regressions.
Other mature backends (i386, x86_64, arm64) all define PROMOTE_RET,
which forces explicit sign/zero extension of narrow return types at the
caller side. Without it, riscv64 relied on the assumption that RV64
registers are always sign-extended, which may not hold when interfacing
with non-TCC compilers.
Verified on Spacemit X100 (riscv64): self-compilation is self-consistent
across 3 layers. test3 reference mismatch is expected — the test
intentionally invokes UB via type-punned function pointers (csf macro).
tccpe.c:
- fix arm64 unwind codes (to make native set/longjmp() work)
sizeof(RUNTIME_FUNCTION) is 8 on arm64 in the first place
no need to note stack slots if we don't save any registers anyway
arm64-gen.c:
- fix long double reg-move
- fix arm64_hfa() for structs with float arrays
- gfunc_prolog(): setup stackframe eariler (simplifies unwind codes)
- new function gv_addr(RC);
win32/include/setjmp.h:
- provide correct definition for setjmo() (frameoffset = 224)
tccasm.c:
- support ".quad" with symbol & relocation
- support ".size"
- fix ". - symbol" arithmetic
win32/lib/crt1.c and win32/include/stdlib.h:
- do not write to __argc/__argv which reside in msvcrt.dll
(msvcrt.dll on arm64 does not like that, crashes on unload)
tcc.c,libtcc.c:
- new functions tcc_fopen/fclose to avoid different stdio unstances
in tcc.exe & libtcc.dll
tests & github workflow:
- add test-win32.bat to run tests with a tcc compiled by build-tcc.bat
- add msvcrt_start.c for gcc/clang to use the same runtime as tcc
the problem is that newer gcc as well as clang and cl are
linking to newer runtimes (such as UCRT) that have partially
different printf format behavior which makes tcctest fail.
the solution here is to force these compilers to link with
msvcrt.dll just like tcc.
Also, there is no gcc on arm64-win32 currently at all.
Anyway, this approach to running the github CI tests
does not require msys2. But It does rely on gnumake
as well as on some 'sh' shell though which seems to be
installed somewhere (maybe it is the one from git).
from: https://github.com/bold84/tinycc
Author: Benjamin Oldenburg <benjamin.oldenburg@ordis.co.th> 2026-04-04 16:29:28
Committer: Benjamin Oldenburg <benjamin.oldenburg@ordis.co.th> 2026-04-04 16:29:28
Branch: win_arm64_clean
Commit: 8b5ab1bb01
Also here: https://repo.or.cz/tinycc.git/shortlog/refs/mob/mob_bold84/win_arm64_clean
This and the followup commits on mob is selected parts
of that original branch. So it is not everything.
It is not, for example:
- unrelated whitespace changes in many files
- a "pin msvcrt.dll" feature in tccpe.c (why that)
- a native getenv() replacement in tcc.c (why that)
- larger changes to the win32/lib runtime and tccrun.c (not needed)
- a very gcc specific detail for struct alignent in tccgen.c
- a custom set/longjmp implementation/replacement (not needed)
- lots of rather basic test files in the win32 folder
- a 'tests/asm' folder with some files (one file renamed to 140_test...c)
- a .docs folder with one file
Revert "Add support to debug libtcc code"
- not fully developed experimental feature
This reverts commit 1fe3e3bff5.
This reverts commit 4768b11737.
Revert "tests: add test for x86_64 xor REX prefix bug in load()"
- AI generated nonsense test
This reverts commit d5ecb52a71.
Revert "tccpp.c: Improve integer constant overflow warning"
- Too long and confusing messages and comments for feature
with questionable benefit.
This reverts commit 085bdf8997.
riscv64-link:
- cleanup "pair pcrel lo relocations by hi address"
From fada98b1ce
tccgen.c:
- Simplify "Cast signed pointer offset to ptrdiff_t before performing arithmetic"
From 5ad52cc1ed
libtcc.c:
- Revert "tcc options: document behavior and clashes (no-op)"
a bit more information than one would like to have I think.
(why try to understand that comments plus the extra
script if one can as well just read the code itself ;)
From 234e2dd2bf
tccdefs.h:
- Revert "Move lib/va_list.c into include/tccdefs.h"
Lets not fill tccdefs.h with too much inline code
Also, -nostdlib -run is no longer supported
From fa6a6bfbbd
arm64-gen.c:
- cleanup "Implement TOK_NEG for floats natively"
Also, make it "no lvalue" in tccgen.c/x86-64-gen.c
From c39eaf10cf
lib/lib-arm64.c:
- cleanup "Remove libc dependency from lib-arm64"
using unions is much faster than some made up memcpy()
From 8c61b91de8
This reverts the crap from an unknown committer "OpenCode[AI]", that added an extension to TinyCC,
which is incompatible to the C standard and not available in any other mainstream C compiler:
* Revert "No More ; needed"
This reverts commit 6547ea47d6
* Revert "Add AGENTS.md"
This reverts commit 898f496dc9.
This also reverts a regression fix by "Zuhaitz.dev", which fixed a small part of the OpenCode-AI chaos:
* Revert "tccgen: Fix optional semicolon regression"
This reverts commit 169628a6ab
--
Regards ... Detlef
When load() in x86_64-gen.c generates a zero constant for a 64-bit
register, it uses:
o(0xc031 + REG_VALUE(r) * 0x900);
REG_VALUE(r) masks to (r & 7), losing bit 3, and no orex() call
emits the REX prefix needed for registers r8-r15. For TREG_R11
(used by gcall_or_jmp for indirect calls), this emits
"xor %ebx,%ebx" (31 db) instead of "xor %r11d,%r11d" (45 31 db),
clobbering the wrong register.
The test compiles an indirect call through a null function pointer
((void(*)(void))0)() via libtcc, then inspects the generated machine
code for the incorrect encoding.
workflow:
- revert 'pinact for security' for readability
from 831c3fa184
tccpp.c:
- remove code that allows tcc to parse numbers incorrectly (*)
from 829c848520
tccgen.c:
- Revert "Relaxed the 'incompatible pointer type' warning a bit" (*)
from d9ec17d334.
tccrun.c:
- remove support for -nostdlib -run
for simplicity, we require "main" with tcc -run always
tccpp.c:
- Revert "Free all preprocessor memmory in case of error."
from c96f0cad61
Remove TinyAlloc->limit instead. Thus it can do also bigger
allocs. Big TokenStrings (like 200kb+ when compiling tcc)
may come from inline functions or from large initializers.
Makefile/configure:
- use --config-pie for configuring tcc output only
- use -fPIC with clang-x86_64 to avoid 32-bit relocs
libtcc.c:
- fix "tcc file.c -run" i.e. -run as last argument
i386-gen.c:
- PIC refactor
(*) sorry, but code in tcc should have a minimum of generic relevance
I tried several gdb/lldb options to debug libtcc generated code.
But gdb/lldb complained that they could not load symbols or
that module does not exist. There was also another problem. The
code itself was in memory (string) and gdb/lldb do not have
functions to acces it.
So I came up with a new api for debugging libtcc code.
First you enable debugging with: tcc_set_options(s, "-g")
Then compile the code with: tcc_compile_string_file(s, program, "<file>.c")
Then call tcc_relocate().
And finaly write the object file to disk: elf_output_obj(s, "<file>.o")
Now you can start the debugger and put an breakpoint after the
elf_output_obj() code. Then use gdb command add-symbol-file <file>.o
and from there on you can set breakpoints in the libtcc generated code.
You can also step/print variables/...
I could not find a simular function in lldb yet.
When debugging is done you remove the tcc_set_options(s, "-g").
All other code can remain because tcc_compile_string_file and
elf_output_obj do not output any file any more is debug is not set.
See also tests/libtcc_debug.c
- 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
despite being defined in tcc's own stddef.h, intended to be included by
libtcc.h, libtcc.h actually included the libc's standard include
tested on musl
* case 1: local scope of 'ff'
int main() {
int ff = 123;
{
int ff(int):
ff(456)
}}
* case 2: linkage of a static extern symbol
(older gcc did allow that)
static int ff(int);
int main() {
int ff(int):
ff(456)
}
Also:
- cleanup enum, let sym_push() handle redefinition
- just mark incomplete array base types, unshare only
when needed (in decl_initializer_alloc())
- fix sizeof empty array (= 0) : int ii[] = {};
- rename 'Sym' members used by __attribute__((cleanup(f)))
Fix 'void func2(char *(*md)(char *md))' declaration.
Fix global array and local extern array problems.
Fix scope problem with old function declaration.
Fix 'typedef int t[]' declaration. Empty size should remain.
... see tests
Also:
- tccgen.c: cleanup _Generic a little
- libtcc.c: cleanup mem-debug a little
- arm-link.c: read/write only once
- tcc.h: another fix for clang offsetof
- tccdbg.c:
* stabs: handle forward struct/enum decls
* stabs: fix anonymous struct members (must not have a .L123 name)
* avoid strncpy()
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)
The code:
void mul(double *p)
{
*p *= 2.0;
}
failed on x86_64 because register was not loaded after
bound checking call.
Also printed size when pointer indir failes.
