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|
use crate::arena::Handle;
use super::flow::*;
use super::*;
pub type BlockId = u32;
#[derive(Copy, Clone, Debug)]
pub struct MergeInstruction {
pub merge_block_id: BlockId,
pub continue_block_id: Option<BlockId>,
}
/// Terminator instruction of a SPIR-V's block.
#[derive(Clone, Debug)]
#[allow(dead_code)]
pub enum Terminator {
///
Return {
value: Option<Handle<crate::Expression>>,
},
///
Branch { target_id: BlockId },
///
BranchConditional {
condition: Handle<crate::Expression>,
true_id: BlockId,
false_id: BlockId,
},
///
/// switch(SELECTOR) {
/// case TARGET_LITERAL#: {
/// TARGET_BLOCK#
/// }
/// default: {
/// DEFAULT
/// }
/// }
Switch {
///
selector: Handle<crate::Expression>,
/// Default block of the switch case.
default: BlockId,
/// Tuples of (literal, target block)
targets: Vec<(i32, BlockId)>,
},
/// Fragment shader discard
Kill,
///
Unreachable,
}
impl<I: Iterator<Item = u32>> super::Parser<I> {
pub fn parse_function(
&mut self,
inst: Instruction,
module: &mut crate::Module,
) -> Result<(), Error> {
self.switch(ModuleState::Function, inst.op)?;
inst.expect(5)?;
let result_type = self.next()?;
let fun_id = self.next()?;
let _fun_control = self.next()?;
let fun_type = self.next()?;
let mut fun = {
let ft = self.lookup_function_type.lookup(fun_type)?;
if ft.return_type_id != result_type {
return Err(Error::WrongFunctionResultType(result_type));
}
crate::Function {
name: self.future_decor.remove(&fun_id).and_then(|dec| dec.name),
arguments: Vec::with_capacity(ft.parameter_type_ids.len()),
return_type: if self.lookup_void_type.contains(&result_type) {
None
} else {
Some(self.lookup_type.lookup(result_type)?.handle)
},
global_usage: Vec::new(),
local_variables: Arena::new(),
expressions: self.make_expression_storage(),
body: Vec::new(),
}
};
// read parameters
for i in 0..fun.arguments.capacity() {
match self.next_inst()? {
Instruction {
op: spirv::Op::FunctionParameter,
wc: 3,
} => {
let type_id = self.next()?;
let id = self.next()?;
let handle = fun
.expressions
.append(crate::Expression::FunctionArgument(i as u32));
self.lookup_expression
.insert(id, LookupExpression { type_id, handle });
//Note: we redo the lookup in order to work around `self` borrowing
if type_id
!= self
.lookup_function_type
.lookup(fun_type)?
.parameter_type_ids[i]
{
return Err(Error::WrongFunctionArgumentType(type_id));
}
let ty = self.lookup_type.lookup(type_id)?.handle;
fun.arguments
.push(crate::FunctionArgument { name: None, ty });
}
Instruction { op, .. } => return Err(Error::InvalidParameter(op)),
}
}
// Read body
let mut local_function_calls = FastHashMap::default();
let mut flow_graph = FlowGraph::new();
// Scan the blocks and add them as nodes
loop {
let fun_inst = self.next_inst()?;
log::debug!("{:?}", fun_inst.op);
match fun_inst.op {
spirv::Op::Label => {
// Read the label ID
fun_inst.expect(2)?;
let block_id = self.next()?;
let node = self.next_block(
block_id,
&mut fun.expressions,
&mut fun.local_variables,
&module.types,
&module.constants,
&module.global_variables,
&mut local_function_calls,
)?;
flow_graph.add_node(node);
}
spirv::Op::FunctionEnd => {
fun_inst.expect(1)?;
break;
}
_ => {
return Err(Error::UnsupportedInstruction(self.state, fun_inst.op));
}
}
}
flow_graph.classify();
flow_graph.remove_phi_instructions(&self.lookup_expression);
fun.body = flow_graph.to_naga()?;
// done
fun.fill_global_use(&module.global_variables);
let source = match self.lookup_entry_point.remove(&fun_id) {
Some(ep) => {
module.entry_points.insert(
(ep.stage, ep.name.clone()),
crate::EntryPoint {
early_depth_test: ep.early_depth_test,
workgroup_size: ep.workgroup_size,
function: fun,
},
);
DeferredSource::EntryPoint(ep.stage, ep.name)
}
None => {
let handle = module.functions.append(fun);
self.lookup_function.insert(fun_id, handle);
DeferredSource::Function(handle)
}
};
if let Some(ref prefix) = self.options.flow_graph_dump_prefix {
let dump = flow_graph.to_graphviz().unwrap_or_default();
let suffix = match source {
DeferredSource::EntryPoint(stage, ref name) => {
format!("flow.{:?}-{}.dot", stage, name)
}
DeferredSource::Function(handle) => format!("flow.Fun-{}.dot", handle.index()),
};
let _ = std::fs::write(prefix.join(suffix), dump);
}
for (expr_handle, dst_id) in local_function_calls {
self.deferred_function_calls.push(DeferredFunctionCall {
source: source.clone(),
expr_handle,
dst_id,
});
}
self.lookup_expression.clear();
self.lookup_sampled_image.clear();
Ok(())
}
}
|
