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Sema: delete bootstrap compiler bug workaround

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mlugg 2024-08-19 07:55:18 +01:00
parent 9cf8a7661f
commit 95fbfde9da
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1 changed files with 99 additions and 105 deletions
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204
src/Sema.zig
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@ -7734,123 +7734,117 @@ fn analyzeCall(
} }));
}
// This `res2` is here instead of directly breaking from `res` due to a stage1
// bug generating invalid LLVM IR.
const res2: Air.Inst.Ref = res2: {
memoize: {
if (!should_memoize) break :memoize;
if (!is_comptime_call) break :memoize;
const memoized_call_index = ip.getIfExists(.{
.memoized_call = .{
.func = module_fn_index,
.arg_values = memoized_arg_values,
.result = undefined, // ignored by hash+eql
.branch_count = undefined, // ignored by hash+eql
},
}) orelse break :memoize;
const memoized_call = ip.indexToKey(memoized_call_index).memoized_call;
if (sema.branch_count + memoized_call.branch_count > sema.branch_quota) {
// Let the call play out se we get the correct source location for the
// "evaluation exceeded X backwards branches" error.
break :memoize;
}
sema.branch_count += memoized_call.branch_count;
break :res2 Air.internedToRef(memoized_call.result);
memoize: {
if (!should_memoize) break :memoize;
if (!is_comptime_call) break :memoize;
const memoized_call_index = ip.getIfExists(.{
.memoized_call = .{
.func = module_fn_index,
.arg_values = memoized_arg_values,
.result = undefined, // ignored by hash+eql
.branch_count = undefined, // ignored by hash+eql
},
}) orelse break :memoize;
const memoized_call = ip.indexToKey(memoized_call_index).memoized_call;
if (sema.branch_count + memoized_call.branch_count > sema.branch_quota) {
// Let the call play out se we get the correct source location for the
// "evaluation exceeded X backwards branches" error.
break :memoize;
}
sema.branch_count += memoized_call.branch_count;
break :res Air.internedToRef(memoized_call.result);
}
new_fn_info.return_type = sema.fn_ret_ty.toIntern();
if (!is_comptime_call and !block.is_typeof) {
const zir_tags = sema.code.instructions.items(.tag);
for (fn_info.param_body) |param| switch (zir_tags[@intFromEnum(param)]) {
.param, .param_comptime => {
const inst_data = sema.code.instructions.items(.data)[@intFromEnum(param)].pl_tok;
const extra = sema.code.extraData(Zir.Inst.Param, inst_data.payload_index);
const param_name = sema.code.nullTerminatedString(extra.data.name);
const inst = sema.inst_map.get(param).?;
new_fn_info.return_type = sema.fn_ret_ty.toIntern();
if (!is_comptime_call and !block.is_typeof) {
const zir_tags = sema.code.instructions.items(.tag);
for (fn_info.param_body) |param| switch (zir_tags[@intFromEnum(param)]) {
.param, .param_comptime => {
const inst_data = sema.code.instructions.items(.data)[@intFromEnum(param)].pl_tok;
const extra = sema.code.extraData(Zir.Inst.Param, inst_data.payload_index);
const param_name = sema.code.nullTerminatedString(extra.data.name);
const inst = sema.inst_map.get(param).?;
try sema.addDbgVar(&child_block, inst, .dbg_arg_inline, param_name);
},
.param_anytype, .param_anytype_comptime => {
const inst_data = sema.code.instructions.items(.data)[@intFromEnum(param)].str_tok;
const param_name = inst_data.get(sema.code);
const inst = sema.inst_map.get(param).?;
try sema.addDbgVar(&child_block, inst, .dbg_arg_inline, param_name);
},
.param_anytype, .param_anytype_comptime => {
const inst_data = sema.code.instructions.items(.data)[@intFromEnum(param)].str_tok;
const param_name = inst_data.get(sema.code);
const inst = sema.inst_map.get(param).?;
try sema.addDbgVar(&child_block, inst, .dbg_arg_inline, param_name);
},
else => continue,
};
}
if (is_comptime_call and ensure_result_used) {
try sema.ensureResultUsed(block, sema.fn_ret_ty, call_src);
}
if (is_comptime_call or block.is_typeof) {
// Save the error trace as our first action in the function
// to match the behavior of runtime function calls.
const error_return_trace_index = try sema.analyzeSaveErrRetIndex(&child_block);
sema.error_return_trace_index_on_fn_entry = error_return_trace_index;
child_block.error_return_trace_index = error_return_trace_index;
}
// We temporarily set `allow_memoize` to `true` to track this comptime call.
// It is restored after this call finishes analysis, so that a caller may
// know whether an in-progress call (containing this call) may be memoized.
const old_allow_memoize = sema.allow_memoize;
defer sema.allow_memoize = old_allow_memoize and sema.allow_memoize;
sema.allow_memoize = true;
// Store the current eval branch count so we can find out how many eval branches
// the comptime call caused.
const old_branch_count = sema.branch_count;
const result = result: {
sema.analyzeFnBody(&child_block, fn_info.body) catch |err| switch (err) {
error.ComptimeReturn => break :result inlining.comptime_result,
else => |e| return e,
};
break :result try sema.resolveAnalyzedBlock(block, call_src, &child_block, merges, need_debug_scope);
try sema.addDbgVar(&child_block, inst, .dbg_arg_inline, param_name);
},
else => continue,
};
}
if (is_comptime_call) {
const result_val = try sema.resolveConstValue(block, LazySrcLoc.unneeded, result, undefined);
const result_interned = result_val.toIntern();
if (is_comptime_call and ensure_result_used) {
try sema.ensureResultUsed(block, sema.fn_ret_ty, call_src);
}
// Transform ad-hoc inferred error set types into concrete error sets.
const result_transformed = try sema.resolveAdHocInferredErrorSet(block, call_src, result_interned);
if (is_comptime_call or block.is_typeof) {
// Save the error trace as our first action in the function
// to match the behavior of runtime function calls.
const error_return_trace_index = try sema.analyzeSaveErrRetIndex(&child_block);
sema.error_return_trace_index_on_fn_entry = error_return_trace_index;
child_block.error_return_trace_index = error_return_trace_index;
}
// If the result can mutate comptime vars, we must not memoize it, as it contains
// a reference to `comptime_allocs` so is not stable across instances of `Sema`.
// TODO: check whether any external comptime memory was mutated by the
// comptime function call. If so, then do not memoize the call here.
if (should_memoize and sema.allow_memoize and !Value.fromInterned(result_interned).canMutateComptimeVarState(zcu)) {
_ = try pt.intern(.{ .memoized_call = .{
.func = module_fn_index,
.arg_values = memoized_arg_values,
.result = result_transformed,
.branch_count = sema.branch_count - old_branch_count,
} });
}
// We temporarily set `allow_memoize` to `true` to track this comptime call.
// It is restored after this call finishes analysis, so that a caller may
// know whether an in-progress call (containing this call) may be memoized.
const old_allow_memoize = sema.allow_memoize;
defer sema.allow_memoize = old_allow_memoize and sema.allow_memoize;
sema.allow_memoize = true;
break :res2 Air.internedToRef(result_transformed);
}
// Store the current eval branch count so we can find out how many eval branches
// the comptime call caused.
const old_branch_count = sema.branch_count;
if (try sema.resolveValue(result)) |result_val| {
const result_transformed = try sema.resolveAdHocInferredErrorSet(block, call_src, result_val.toIntern());
break :res2 Air.internedToRef(result_transformed);
}
const new_ty = try sema.resolveAdHocInferredErrorSetTy(block, call_src, sema.typeOf(result).toIntern());
if (new_ty != .none) {
// TODO: mutate in place the previous instruction if possible
// rather than adding a bitcast instruction.
break :res2 try block.addBitCast(Type.fromInterned(new_ty), result);
}
break :res2 result;
const result = result: {
sema.analyzeFnBody(&child_block, fn_info.body) catch |err| switch (err) {
error.ComptimeReturn => break :result inlining.comptime_result,
else => |e| return e,
};
break :result try sema.resolveAnalyzedBlock(block, call_src, &child_block, merges, need_debug_scope);
};
break :res res2;
if (is_comptime_call) {
const result_val = try sema.resolveConstValue(block, LazySrcLoc.unneeded, result, undefined);
const result_interned = result_val.toIntern();
// Transform ad-hoc inferred error set types into concrete error sets.
const result_transformed = try sema.resolveAdHocInferredErrorSet(block, call_src, result_interned);
// If the result can mutate comptime vars, we must not memoize it, as it contains
// a reference to `comptime_allocs` so is not stable across instances of `Sema`.
// TODO: check whether any external comptime memory was mutated by the
// comptime function call. If so, then do not memoize the call here.
if (should_memoize and sema.allow_memoize and !Value.fromInterned(result_interned).canMutateComptimeVarState(zcu)) {
_ = try pt.intern(.{ .memoized_call = .{
.func = module_fn_index,
.arg_values = memoized_arg_values,
.result = result_transformed,
.branch_count = sema.branch_count - old_branch_count,
} });
}
break :res Air.internedToRef(result_transformed);
}
if (try sema.resolveValue(result)) |result_val| {
const result_transformed = try sema.resolveAdHocInferredErrorSet(block, call_src, result_val.toIntern());
break :res Air.internedToRef(result_transformed);
}
const new_ty = try sema.resolveAdHocInferredErrorSetTy(block, call_src, sema.typeOf(result).toIntern());
if (new_ty != .none) {
// TODO: mutate in place the previous instruction if possible
// rather than adding a bitcast instruction.
break :res try block.addBitCast(Type.fromInterned(new_ty), result);
}
break :res result;
} else res: {
assert(!func_ty_info.is_generic);