Specifically we should write the sysval semantic as an instruction idx
for the following instructions:
VKD3D_SM4_OP_DCL_INPUT_SGV
VKD3D_SM4_OP_DCL_INPUT_PS_SGV
VKD3D_SM4_OP_DCL_INPUT_SIV
VKD3D_SM4_OP_DCL_INPUT_PS_SIV
VKD3D_SM4_OP_DCL_OUTPUT_SIV
and not the following ones:
VKD3D_SM4_OP_DCL_INPUT
VKD3D_SM4_OP_DCL_PS_INPUT
VKD3D_SM4_OP_DCL_OUTPUT
Which is consistent with what we do when reading these instructions in
the following functions:
shader_sm4_read_declaration_register_semantic()
shader_sm4_read_dcl_input_ps_siv()
and
shader_sm4_read_dcl_input_ps()
shader_sm4_read_declaration_dst()
for the non-SGV and non-SIV cases.
Note that the non-SGV and non-SIV instructions don't need/use this
extra information because they rely on the dst register type and index.
I suggest to introduce this change because the here replaced check is
brittle, and we might be omitting the sysval semantic in some cases.
The primary goal here is to move compilation profile type and version
check outside of a parsing stage. Default values for parameters were
never subjected to this fixup, and it does look tpf-specific, so moving
it where it belongs.
Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Currently, if an expression successfully parses according to the bison grammar,
but for one reason or another cannot generate a meaningful IR instruction, we
abort parsing with YYABORT. This includes, for example, an undefined variable or
function, invalid swizzle or field reference, or a constructor with a complex or
non-numeric data type.
Aborting parsing is unfortunate, however, because it means that any further
errors in the program cannot be caught by the programmer, increasing the number
of times they will need to fix errors and recompile.
The idea of this patch is that any such expression will instead generate an IR
node whose data type is of HLSL_CLASS_ERROR. Any further expression which would
consume an "error" typed instruction will instead immediately return an
expression of type "error" (probably the same one) instead of aborting or doing
any other type-checking.
Currently these "error" instructions should not pass the parsing stage, since
hlsl_compile_shader() will immediately notice that compilation has failed and
skip any optimization, lowering, or bytecode-writing.
A further direction to take this is to pre-allocate one "error" expression
immediately when creating the HLSL parser, and return that expression when we
fail to allocate an hlsl_ir_node of any type. This means we do not need to
handle allocation errors when constructing nodes, saving us quite a lot of error
handling (which is not only tedious but currently often broken, if nothing else
by virtue of neglecting cleanup of local variables).
shader_signature_find_element_for_reg() is also used in the TPF parser,
where the program has not been validated yet, so it must not crash
on errors.
The I/O normaliser can instead assume that the shader is already
validated.
This fixes a crash with a shader used by The Falconeer. The bug is still
present, because the shader will be incorrectly rejected, but at least
the vkd3d-shader will fail gracefully.
