For RISC-V TCC needs a modified libc because it doesn't support Extended
Assembly. This change enables that kind of behavior, letting us select
the TCC library when it is present.
* build-aux/bootstrap.sh.in: Add a block to build-source-lib for TCC.
* build-aux/configure-lib.sh: Guard TCC to remove repeated definitions
from its libc.
* build-aux/install.sh.in: Make it install TCC's library, too
These are needed by the build scripts, but in RISC-V being empty is
enough.
* lib/linux/riscv64-mes-gcc/crti.c,
lib/linux/riscv64-mes-gcc/crtn.c,
lib/linux/riscv64-mes-tcc/crti.c,
lib/linux/riscv64-mes-tcc/crtn.c: New files.
RISC-V64 has `unsigned char` for `char`, so it failed to build. In amd64
`char` is `signed char`, so the code wasn't portable. We have to be
explicit about the sign of the `char`.
* lib/test/scaffold/16-cast.c: Add `signed` to `char`.
Note about the -tcc file:
HAVE_FLOAT_ASM defines if there's assembly support for float
instructions.
HAVE_FLOAT defines if there's floating point arithmetic support.
This is important for TinyCC because the assembler and the C
compiler are split. TinyCC can HAVE_FLOAT but no assembler support
for them.
* lib/riscv64-mes-gcc/setjmp.c,
lib/riscv64-mes-tcc/setjmp.c: New files.
`char` signedness is not defined by C standard. In some architectures
it's `unsigned` by default (RISC-V), so it's better to be explicit to
avoid problems.
* include/stdint.h (int8_t): Use `signed char` instead of `char`.
Bootstrappable TCC needs some extra definitions that upstream TCC
obtains from `tccdefs.h` in its codebase, which is also injected in the
binary using a weird trick (see `c2str` in tcc's codebase).
* include/stdarg.h: Add definitions for variable length arguments.
At the moment tcc does not support assembler instructions
with C expression operands. As a workaround read values
directly from stack.
* lib/linux/riscv64-mes-tcc/_exit.c
* lib/linux/riscv64-mes-tcc/_write.c
* lib/linux/riscv64-mes-tcc/syscall.c
Adapted from -gcc but make assembly match tcc style assembly where the
offsets are received as an extra input argument:
sw a0, 9(t0)
Becomes:
sw a0, t0, 9
* lib/linux/riscv64-mes-tcc/_exit.c,
lib/linux/riscv64-mes-tcc/_write.c,
lib/linux/riscv64-mes-tcc/crt1.c,
lib/linux/riscv64-mes-tcc/exit-42.S,
lib/linux/riscv64-mes-tcc/hello-mes.S,
lib/linux/riscv64-mes-tcc/syscall-internal.c,
lib/linux/riscv64-mes-tcc/syscall.c: New files.
Flattens case structures as nyacc is giving consecutive cases as a
nested block like:
(case testA
(case testB
(case testC BODY)))
We convert to:
((case testA (expr-stmt))
(case testB (expr-stmt))
(case testC BODY))
And then treat them as independent cases. For the fallthrough we just
add a jump to each case's body right before its clause (each of the case
blocks is responsible of adding its own jump to its body):
// This doesn't have it because it's the first
CASE1:
testA
CASE1_BODY:
goto CASE2_BODY
CASE2:
testB
CASE2_BODY:
goto CASE3_BODY
CASE3:
testB
CASE3_BODY:
This enables complex fallthrough schemes comparing to what was done
before.
* module/mescc/compile.scm (ast->info)[switch]{flatten-cases}: New
variable.
(ast->info)[switch]{statements}: Use flatten-cases on it.
(switch->expr): Remove unneeded matchers and add jumps to body.
* build-aux/check-mescc.sh(xfail-tests): Remove
lib/tests/scaffold/66-local-char-array.c.
This test detects if the fallthrough in a switch statement falls to the
next case (good) or to the default case (bad).
* lib/tests/scaffold/44-switch-body-fallthrough-not-default.c: New file.
* build-aux/check-mescc.sh (mes_tests): Add it.
We detected the value in off64 in the test is not -1 as it should but 56
ones. This is because the rotation is applied as unsigned even with the
signed cast. This breaks many things in tcc.
* lib/tests/scaffold/50-compare-rotated-weird.c: New file.
* build-aux/check-mescc.sh (mes_tests): Add it.
This is a follow-up to commits
7a8a2fc517
mescc: x86_64 support: Refactor to abstracted assembly, add x86_64.
and
c9ba7a619b
mescc: Refactor variable declaration.
There was a debug "22" leaking in compile.scm. It should be a "0".
* module/mescc/compile.scm (init-local): Replace "22" with "0".
* lib/tests/scaffold/7v-struct-initialize-zeroes.c: New test.
* build-aux/check-mescc.sh (tcc_tests): Add it.
(xfail-tests): Remove lib/tests/scaffold/72-typedef-struct-def-local.c.
* PORTING (Setup environment): Use nyacc 1.00.2. Prefer git-minimal
over git to avoid dependencies on subversion and graphic libraries. Add
riscv64-linux example.
* lib/linux/riscv64-mes-gcc/crt1.c (_start): Replace manual initialization
of __stdin, __stdout, __stderr, and environ with __init_io ().
* lib/linux/riscv64-mes-mescc/crt1.c (_start): Likewise.
Artemis Tosini
