it doesn't round so the RM field can be zero. According to some
sourcs it should be set to zero by software in these cases, and
the binutils disassembler doesn't like us setting it to 7.
This shouldn't matter in practice, but who knows.
This allows creation of TCCStates and operation with API
calls independently from each other, even from threads.
Frontend (option parsing/libtcc.c) and backend (linker/tccelf.c)
now depend only on the TCCState (s1) argument.
Compilation per se (tccpp.c, tccgen.c) is still using
globals for convenience. There is only one entry point
to this section which is tcc_compile() which is protected
by a semaphore.
There are some hacks involved to avoid too many changes,
as well as some changes in order to avoid too many hacks ;)
The test libtcc_test_mt.c shows the feature. Except this
new file the patch adds 87 lines overall.
this fixes the ret_mixed_test of abitest.c, now everything of the
testsuite works.
The generic code for returns is good enough for our use, except in
the specific case of a mixed int/float structures returned in registers,
so instead of duplicating the whole generic gfunc_return function, add
another modus for gfunc_sret: returning -1 makes the actual register
transfer by a new backend function.
this fixes ret_2float_test, ret_2double_test and
ret_8plus2double_test of abitest.c. The common gfunc_return
actually works for these cases, so let's use that for now.
The ret_mixed_test (as well as mixed2 and mixed3) are left
broken, and tccgen.c:gfunc_return can't be used for that as is,
so I'll leave the gfunc_return implementation in riscv64-gen.c for
now, I'll have to think about this some more.
this is it! With this tcctest.c works, as well as compiling
TCC with itself. abitest.c doesn't yet work due to known
problems, all the rest does. There are still warnings during
linking.
float to int must be truncations, not normal rounding.
And ftof was typoed to select the wrong conversion function.
This fixes tcctest.c completely. (make -C tests test1)
loads and stores to global symbols need to go via the
GOT (at least for weaks), otherwise -run doesn't work.
Ideally we'd generate GOT relocs (and loads) always and replace
them with PCREL relocs and adds during linking.
the invariant for the risc-v codegen is, that 64bit regs
generally contain the sign-extension of a 32bit value.
This wasn't heeded by loads of 32bit values from memory, which
used lwu and ultimately caused a miscompilation in string_test
of tcctest.c.
Now most of tcctest.c works (not with -run, but with linking
a real executable), except some ftoi/ftof conversions.
for the implementation of operations we can reuse the ones
from lib/lib-arm64.c, risc-v long double is also float128.
Also implement ggoto, and PDIV, and use t0 in load/store as
temporary register if necessary, not one given by get_reg
(the latter can destroy assignments of long double parameters
in function calls that are already set up).
This let's us compile tcc.c and tcctest.c, though both
don't yet work.
some constants were loaded wrong (e.g. 0xffffabcdU), and
risc-v needs to do explicit zero-extensions for widening from
32bit (not sign-extensions like the other 64bit targets).
This makes the whole tests2.all testsuite work.
Parameter passing is still not psABI-compliant, but internally
consistent. (e.g. structs of two floats/doubles are passed
in integer registers, but should sit in float regs).
this also fixes passing of params > 16 bytes. In riscv
they aren't passed by value on stack, but via reference (and
because callees are allowed to modify by-ref params the caller must
allocate an own copy per call).
This fixes the stdarg parts of 73_arm.c.
like long double (16 bytes) and structs. Not completely
correct, but 73_arm64 somewhat works now (when the stdarg part
is disabled), though with some errors. What's definitely incorrect
is arguments of a mixed int/float struct. I'm using VT_LDOUBLE
(which conveniently has to be placed in a int-reg-pair) to load/store
structure arguments of size > 8 and <= 16, and that can lead to
overreads.
for 101_cleanup we need 256kb stack (with the associated problem
of needing a larger prologue/epilogue) as well as jumps out of
range for the 21bit offsets (exactly for second part of the prologue).
* support loading sym addresses from GOT: important for weak syms,
fixes 104_inline. This is still incomplete, it only works
for taking the sym address, not for directly loading/storing into
such symbols (i.e. not for VT_LVAL)
* another op: '%'
* ELF flags: add EF_RISCV_FLOAT_ABI_DOUBLE, which is our ABI.
fixes 95_bitfields. loading 64bit constants is suboptimal
right now. int32_t shifts really need to use the W form,
otherwise 'x << 24 >> 24' doesn't extract the low 8 bits.
long double on risc-v is 128bit, but there are no registers
for that type (without the Q ISA extension). They are passed
like two 64bit integers values (with an exception for varargs,
where it's an aligned register pair). This all requires some
hacks in generic code as otherwise RC_FLOAT regs are tried for
holding values of long double type, but we need a RC_INT register
pair. This really could all use some cleanup for all archs.
This doesn't implement any conversions of operations for long
double, but it's enough to get 70_floating_point_literals working.
* more ops: umod and udiv
* large immediates: suboptimal code, e.g. when loading
0xffffffffU (which is what a cast from long to int does).
tests2 work up to 67_macro_concat.
* load/store of FP ops
* load/store from symbols, VT_LLOCAL, some with large addend
* load of VT_JMP result
* calls with many args (stack slots)
* calls with FP args
* more operations: and/or/xor/div
* register indirect loads and stores
* load of local addresses
* indirect calls (uses ra as temporary reg if necessary)
* operations *, -, <<
* gen_cvt_sxtw: is not needed in most cases, let's see
tests2 runs until (incl) 09_do_while.
* implement compares, gtst and gsym/gjmp and add
* implement stores (simple cases)
* fix arg passing with more than one register arg, fix
loads to not always use 8byte loads
* add some predefined macros: __riscv, __riscv_xlen,
__SIZEOF_POINTER__ (needed by glibc header)
The first 5 tests of tests2 run now.
