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Make DataFlowGraph::insts public, but restricted (#5450)

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We have some operations defined on DataFlowGraph purely to work around borrow-checker issues with InstructionData and other data on DataFlowGraph. Part of the problem is that indexing the DFG directly hides the fact that we're only indexing the insts field of the DFG.

This PR makes the insts field of the DFG public, but wraps it in a newtype that only allows indexing. This means that the borrow checker is better able to tell when operations on memory held by the DFG won't conflict, which comes up frequently when mutating ValueLists held by InstructionData.
This commit is contained in:
Trevor Elliott
2022-12-16 10:46:09 -08:00
committed by GitHub
parent 6323b0f9f4
commit 25bf8e0e67
31 changed files with 182 additions and 178 deletions
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4
cranelift/fuzzgen/src/passes/fcvt.rs
View File

@@ -24,7 +24,7 @@ pub fn do_fcvt_trap_pass(fuzz: &mut FuzzGen, func: &mut Function) -> Result<()>
/// Returns true/false if this instruction can trap
fn can_fcvt_trap(pos: &FuncCursor, inst: Inst) -> bool {
let opcode = pos.func.dfg[inst].opcode();
let opcode = pos.func.dfg.insts[inst].opcode();
matches!(opcode, Opcode::FcvtToUint | Opcode::FcvtToSint)
}
@@ -66,7 +66,7 @@ fn float_limits(
/// Prepend instructions to inst to avoid traps
fn insert_fcvt_sequence(pos: &mut FuncCursor, inst: Inst) {
let dfg = &pos.func.dfg;
let opcode = dfg[inst].opcode();
let opcode = dfg.insts[inst].opcode();
let arg = dfg.inst_args(inst)[0];
let float_ty = dfg.value_type(arg);
let int_ty = dfg.value_type(dfg.first_result(inst));

4
cranelift/fuzzgen/src/passes/int_divz.rs
View File

@@ -28,7 +28,7 @@ pub fn do_int_divz_pass(fuzz: &mut FuzzGen, func: &mut Function) -> Result<()> {
/// Returns true/false if this instruction can cause a `int_divz` trap
fn can_int_divz(pos: &FuncCursor, inst: Inst) -> bool {
let opcode = pos.func.dfg[inst].opcode();
let opcode = pos.func.dfg.insts[inst].opcode();
matches!(
opcode,
@@ -38,7 +38,7 @@ fn can_int_divz(pos: &FuncCursor, inst: Inst) -> bool {
/// Prepend instructions to inst to avoid `int_divz` traps
fn insert_int_divz_sequence(pos: &mut FuncCursor, inst: Inst) {
let opcode = pos.func.dfg[inst].opcode();
let opcode = pos.func.dfg.insts[inst].opcode();
let inst_args = pos.func.dfg.inst_args(inst);
let (lhs, rhs) = (inst_args[0], inst_args[1]);
assert_eq!(pos.func.dfg.value_type(lhs), pos.func.dfg.value_type(rhs));