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// * ******************************************************************************************
// * Copyright (c) 2019 Pascal Kuthe. This file is part of the OpenVAF project.
// * It is subject to the license terms in the LICENSE file found in the top-level directory
// * of this distribution and at https://gitlab.com/DSPOM/OpenVAF/blob/master/LICENSE.
// * No part of OpenVAF, including this file, may be copied, modified, propagated, or
// * distributed except according to the terms contained in the LICENSE file.
// * *******************************************************************************************
use crate::analysis::DependencyHandler;
use crate::cfg::{BasicBlock, BasicBlockId, Terminator};
use crate::hir::Block;
use crate::hir_lowering::error::{Error, Type, Warning, WarningType};
use crate::hir_lowering::expression_semantic::{
AssignmentSchematicAnalysis, FunctionInline, SchematicAnalysis,
};
use crate::hir_lowering::HirToMirFold;
use crate::ir::hir::DisciplineAccess;
use crate::ir::mir::{ExpressionId, Statement};
use crate::ir::{BranchId, Node, ParameterId, VariableId};
use crate::ir::{PortId, RealExpressionId, StringExpressionId, SystemFunctionCall};
use crate::mir::{IntegerExpression, VariableType};
use crate::{hir, ControlFlowGraph, Span};
use index_vec::{IndexVec};
use rustc_hash::FxHashSet;
impl<'lt> HirToMirFold<'lt> {
/// Creates a controls flow Graph from a statement block
pub fn fold_block_into_cfg(&mut self, statements: Block) -> ControlFlowGraph {
let mut blocks = IndexVec::new();
self.fold_block_internal(statements, Terminator::End, &mut blocks);
for block in blocks.iter_mut(){
block.statements.reverse()
}
let mut cfg = ControlFlowGraph::new(blocks, &self.mir);
self.generate_derivatives(&mut cfg);
cfg.statement_owner_cache.stmt_count = self.mir.statements.len();
cfg
}
pub(super) fn fold_block_internal(
&mut self,
mut statements: Block,
terminator: Terminator,
blocks: &mut IndexVec<BasicBlockId, BasicBlock>,
) -> BasicBlockId {
let mut current_block = blocks.push(BasicBlock {
statements: Vec::new(),
terminator,
});
while let Some(statement) = statements.next_back() {
match self.hir[statement] {
hir::Statement::Condition(ref condition) => {
let terminator = Terminator::Goto(current_block);
let false_block = self.fold_block_internal(
statements.enter_back(&condition.contents.else_statements),
terminator,
blocks,
);
let true_block = self.fold_block_internal(
statements.enter_back(&condition.contents.if_statements),
terminator,
blocks,
);
let merge = current_block;
current_block = blocks.push(BasicBlock {
statements: Vec::new(),
terminator, //Placeholder
});
let mut inliner = FunctionInline::new(
blocks,
current_block,
self.hir[condition.contents.condition].source,
);
if let Some(condition) =
inliner.fold_integer_expression(self, condition.contents.condition)
{
let tmp = inliner.current_block;
blocks[current_block].terminator = Terminator::Split {
condition,
true_block,
false_block,
merge,
};
current_block = tmp;
}
statements.next_back(); //skip start
}
hir::Statement::While(ref while_loop) => {
let condition_block = blocks.push(BasicBlock {
statements: Vec::new(),
terminator: Terminator::Goto(current_block), //just a placeholder
});
let mut inliner = FunctionInline::new(
blocks,
condition_block,
self.hir[while_loop.contents.condition].source,
);
if let Some(condition) =
inliner.fold_integer_expression(self, while_loop.contents.condition)
{
let false_block = current_block;
let (loop_start, loop_body) = if condition_block == inliner.current_block {
let loop_body = self.fold_block_internal(
statements.enter_back(&while_loop.contents.body),
Terminator::Goto(condition_block),
blocks,
);
(condition_block, loop_body)
} else {
let loop_start = inliner.current_block;
let loop_body = self.fold_block_internal(
statements.enter_back(&while_loop.contents.body),
Terminator::Goto(loop_start),
blocks,
);
(loop_start, loop_body)
};
blocks[condition_block].terminator = Terminator::Split {
condition,
true_block: loop_body,
false_block,
merge: condition_block,
};
current_block = blocks.push(BasicBlock {
statements: Vec::new(),
terminator: Terminator::Goto(loop_start),
});
/*for attr in while_loop.attributes {
if self.mir[attr].name.name == keywords::IMPLICIT_SOLVER {
if let Some(name) = self.mir[attr].value {
if let ExpressionId::String(name) = name {
if let Some(name) = self.mir.try_string_constant_fold(
name,
&Constants::default(),
true,
) {
let ident =
Symbol::intern(&self.mir.string_literals[name]);
condition = self.or_for_derivative(
condition,
ident,
&derived_inside_loop,
);
derived_inside_loop.clear();
} else {
self.errors.push(Error {
error_type:
Type::ImplicitSolverDeltaIsNotAValidString,
source: self.mir[name].source,
});
}
} else {
self.errors.push(Error {
error_type: Type::ImplicitSolverDeltaIsNotAValidString,
source: name.source(&self.mir),
});
}
} else {
self.errors.push(Error {
error_type: Type::ImplicitSolverDeltaIsNotAValidString,
source: self.mir[attr].name.span,
});
}
break;
}
}
if !derived_inside_loop.is_empty() {
self.mir.track_integer_expression(
condition,
&mut FxHashSet::default(),
&mut ImplicitDerivativeCheck {
warnings: &mut self.warnings,
condition_span: self.mir[condition].source,
modified_variables: derived_inside_loop,
},
);
}*/
} else {
current_block = condition_block;
}
statements.next_back(); //skip start
}
hir::Statement::WhileStart { .. } => {
unreachable_unchecked!("Should have been skipped")
}
hir::Statement::ConditionStart { .. } => {
unreachable_unchecked!("Should have been skipped")
}
hir::Statement::Assignment(attr, dst, val)
if matches!(self.mir[dst].contents.variable_type, VariableType::Real(..)) =>
{
// Function calls can insert basic blocks
let tmp_block = current_block;
let mut assignment_schematic = AssignmentSchematicAnalysis::new(
dst,
self.hir[val].source,
blocks,
current_block,
);
if let Some(value) = assignment_schematic.fold_real_expression(self, val) {
let stmt = self.mir.statements.push(Statement::Assignment(
attr,
dst,
ExpressionId::Real(value),
));
// Innefficent but way cleaner than anything else
current_block = assignment_schematic.inliner.current_block;
blocks[tmp_block].statements.push( stmt);
}
}
hir::Statement::Assignment(attr, dst, value) => {
let tmp_block = current_block;
let mut assignment_schematic = AssignmentSchematicAnalysis::new(
dst,
self.hir[value].source,
blocks,
current_block,
);
match assignment_schematic.fold_expression(self, value) {
Some(ExpressionId::Real(val)) => {
let value =
ExpressionId::Integer(self.mir.integer_expressions.push(Node {
source: self.mir[val].source,
contents: IntegerExpression::RealCast(val),
}));
let stmt = self
.mir
.statements
.push(Statement::Assignment(attr, dst, value));
// Innefficent but way cleaner than anything else
current_block = assignment_schematic.inliner.current_block;
blocks[tmp_block].statements.push( stmt);
}
Some(ExpressionId::Integer(val)) => {
let value = ExpressionId::Integer(val);
let stmt = self
.mir
.statements
.push(Statement::Assignment(attr, dst, value));
// Innefficent but way cleaner than anything else
current_block = assignment_schematic.inliner.current_block;
blocks[tmp_block].statements.push( stmt);
}
Some(ExpressionId::String(val)) => {
self.errors.push(Error {
error_type: Type::ExpectedNumber,
source: self.mir[val].source,
});
continue;
}
None => continue,
};
}
hir::Statement::Contribute(attr, access, branch, value) => {
let mut inliner =
FunctionInline::new(blocks, current_block, self.hir[value].source);
if let Some(value) = inliner.fold_real_expression(self, value) {
current_block = inliner.current_block;
let stmt = self
.mir
.statements
.push(Statement::Contribute(attr, access, branch, value));
blocks[current_block].statements.push(stmt);
}
}
hir::Statement::FunctionCall(_, _, _) => todo!("Function Calls"),
}
}
current_block
}
}
struct ImplicitDerivativeCheck<'lt> {
warnings: &'lt mut Vec<Warning>,
modified_variables: FxHashSet<VariableId>,
condition_span: Span,
}
impl<'lt> DependencyHandler for ImplicitDerivativeCheck<'lt> {
fn handle_variable_reference(&mut self, var: VariableId) {
if self.modified_variables.remove(&var) {
self.warnings.push(Warning {
error_type: WarningType::ImplicitDerivative(var),
source: self.condition_span,
})
}
}
fn handle_parameter_reference(&mut self, _: ParameterId) {}
fn handle_branch_reference(&mut self, _: DisciplineAccess, _: BranchId, _: u8) {}
fn handle_system_function_call(
&mut self,
_: SystemFunctionCall<RealExpressionId, StringExpressionId, PortId, ParameterId>,
) {
}
}