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error return traces work with async return case

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This commit is contained in:
Andrew Kelley 2018-04-08 17:44:29 -04:00
parent 9e98ea552d
commit ee1a4f4c1d
6 changed files with 56 additions and 19 deletions
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12
src/all_types.hpp
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@ -3037,7 +3037,8 @@ struct IrInstructionMergeErrRetTraces {
IrInstruction base;
IrInstruction *coro_promise_ptr;
IrInstruction *err_ret_trace_ptr;
IrInstruction *src_err_ret_trace_ptr;
IrInstruction *dest_err_ret_trace_ptr;
};
struct IrInstructionMarkErrRetTracePtr {
@ -3058,13 +3059,16 @@ static const size_t err_union_payload_index = 1;
// TODO call graph analysis to find out what this number needs to be for every function
static const size_t stack_trace_ptr_count = 30;
// these belong to the async function
#define RETURN_ADDRESSES_FIELD_NAME "return_addresses"
#define ERR_RET_TRACE_FIELD_NAME "err_ret_trace"
#define RESULT_FIELD_NAME "result"
#define ASYNC_ALLOC_FIELD_NAME "allocFn"
#define ASYNC_FREE_FIELD_NAME "freeFn"
#define AWAITER_HANDLE_FIELD_NAME "awaiter_handle"
#define RESULT_FIELD_NAME "result"
// these point to data belonging to the awaiter
#define ERR_RET_TRACE_PTR_FIELD_NAME "err_ret_trace_ptr"
#define RESULT_PTR_FIELD_NAME "result_ptr"
#define RETURN_ADDRESSES_FIELD_NAME "return_addresses"
#define ERR_RET_TRACE_FIELD_NAME "err_ret_trace"
enum FloatMode {

3
src/analyze.cpp
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@ -474,6 +474,7 @@ TypeTableEntry *get_promise_frame_type(CodeGen *g, TypeTableEntry *return_type)
field_names.append(RESULT_FIELD_NAME);
field_names.append(RESULT_PTR_FIELD_NAME);
if (g->have_err_ret_tracing) {
field_names.append(ERR_RET_TRACE_PTR_FIELD_NAME);
field_names.append(ERR_RET_TRACE_FIELD_NAME);
field_names.append(RETURN_ADDRESSES_FIELD_NAME);
}
@ -483,7 +484,7 @@ TypeTableEntry *get_promise_frame_type(CodeGen *g, TypeTableEntry *return_type)
field_types.append(return_type);
field_types.append(result_ptr_type);
if (g->have_err_ret_tracing) {
get_ptr_to_stack_trace_type(g);
field_types.append(get_ptr_to_stack_trace_type(g));
field_types.append(g->stack_trace_type);
field_types.append(get_array_type(g, g->builtin_types.entry_usize, stack_trace_ptr_count));
}

4
src/codegen.cpp
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@ -4383,8 +4383,8 @@ static LLVMValueRef ir_render_merge_err_ret_traces(CodeGen *g, IrExecutable *exe
{
assert(g->have_err_ret_tracing);
LLVMValueRef src_trace_ptr = ir_llvm_value(g, instruction->err_ret_trace_ptr);
LLVMValueRef dest_trace_ptr = get_cur_err_ret_trace_val(g, instruction->base.scope);
LLVMValueRef src_trace_ptr = ir_llvm_value(g, instruction->src_err_ret_trace_ptr);
LLVMValueRef dest_trace_ptr = ir_llvm_value(g, instruction->dest_err_ret_trace_ptr);
LLVMValueRef args[] = { dest_trace_ptr, src_trace_ptr };
ZigLLVMBuildCall(g->builder, get_merge_err_ret_traces_fn_val(g), args, 2, get_llvm_cc(g, CallingConventionUnspecified), ZigLLVM_FnInlineAuto, "");

43
src/ir.cpp
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@ -2708,14 +2708,16 @@ static IrInstruction *ir_build_add_implicit_return_type(IrBuilder *irb, Scope *s
}
static IrInstruction *ir_build_merge_err_ret_traces(IrBuilder *irb, Scope *scope, AstNode *source_node,
IrInstruction *coro_promise_ptr, IrInstruction *err_ret_trace_ptr)
IrInstruction *coro_promise_ptr, IrInstruction *src_err_ret_trace_ptr, IrInstruction *dest_err_ret_trace_ptr)
{
IrInstructionMergeErrRetTraces *instruction = ir_build_instruction<IrInstructionMergeErrRetTraces>(irb, scope, source_node);
instruction->coro_promise_ptr = coro_promise_ptr;
instruction->err_ret_trace_ptr = err_ret_trace_ptr;
instruction->src_err_ret_trace_ptr = src_err_ret_trace_ptr;
instruction->dest_err_ret_trace_ptr = dest_err_ret_trace_ptr;
ir_ref_instruction(coro_promise_ptr, irb->current_basic_block);
ir_ref_instruction(err_ret_trace_ptr, irb->current_basic_block);
ir_ref_instruction(src_err_ret_trace_ptr, irb->current_basic_block);
ir_ref_instruction(dest_err_ret_trace_ptr, irb->current_basic_block);
return &instruction->base;
}
@ -6115,6 +6117,13 @@ static IrInstruction *ir_gen_await_expr(IrBuilder *irb, Scope *parent_scope, Ast
Buf *result_ptr_field_name = buf_create_from_str(RESULT_PTR_FIELD_NAME);
IrInstruction *result_ptr_field_ptr = ir_build_field_ptr(irb, parent_scope, node, coro_promise_ptr, result_ptr_field_name);
if (irb->codegen->have_err_ret_tracing) {
IrInstruction *err_ret_trace_ptr = ir_build_error_return_trace(irb, parent_scope, node, IrInstructionErrorReturnTrace::NonNull);
Buf *err_ret_trace_ptr_field_name = buf_create_from_str(ERR_RET_TRACE_PTR_FIELD_NAME);
IrInstruction *err_ret_trace_ptr_field_ptr = ir_build_field_ptr(irb, parent_scope, node, coro_promise_ptr, err_ret_trace_ptr_field_name);
ir_build_store_ptr(irb, parent_scope, node, err_ret_trace_ptr_field_ptr, err_ret_trace_ptr);
}
Buf *awaiter_handle_field_name = buf_create_from_str(AWAITER_HANDLE_FIELD_NAME);
IrInstruction *awaiter_field_ptr = ir_build_field_ptr(irb, parent_scope, node, coro_promise_ptr,
awaiter_handle_field_name);
@ -6144,8 +6153,9 @@ static IrInstruction *ir_gen_await_expr(IrBuilder *irb, Scope *parent_scope, Ast
ir_set_cursor_at_end_and_append_block(irb, no_suspend_block);
if (irb->codegen->have_err_ret_tracing) {
Buf *err_ret_trace_field_name = buf_create_from_str(ERR_RET_TRACE_FIELD_NAME);
IrInstruction *err_ret_trace_ptr = ir_build_field_ptr(irb, parent_scope, node, coro_promise_ptr, err_ret_trace_field_name);
ir_build_merge_err_ret_traces(irb, parent_scope, node, coro_promise_ptr, err_ret_trace_ptr);
IrInstruction *src_err_ret_trace_ptr = ir_build_field_ptr(irb, parent_scope, node, coro_promise_ptr, err_ret_trace_field_name);
IrInstruction *dest_err_ret_trace_ptr = ir_build_error_return_trace(irb, parent_scope, node, IrInstructionErrorReturnTrace::NonNull);
ir_build_merge_err_ret_traces(irb, parent_scope, node, coro_promise_ptr, src_err_ret_trace_ptr, dest_err_ret_trace_ptr);
}
Buf *result_field_name = buf_create_from_str(RESULT_FIELD_NAME);
IrInstruction *promise_result_ptr = ir_build_field_ptr(irb, parent_scope, node, coro_promise_ptr, result_field_name);
@ -6402,6 +6412,8 @@ bool ir_gen(CodeGen *codegen, AstNode *node, Scope *scope, IrExecutable *ir_exec
IrInstruction *coro_id;
IrInstruction *u8_ptr_type;
IrInstruction *const_bool_false;
IrInstruction *coro_promise_ptr;
IrInstruction *err_ret_trace_ptr;
TypeTableEntry *return_type;
Buf *result_ptr_field_name;
VariableTableEntry *coro_size_var;
@ -6417,7 +6429,7 @@ bool ir_gen(CodeGen *codegen, AstNode *node, Scope *scope, IrExecutable *ir_exec
IrInstruction *coro_frame_type_value = ir_build_const_type(irb, coro_scope, node, coro_frame_type);
// TODO mark this var decl as "no safety" e.g. disable initializing the undef value to 0xaa
ir_build_var_decl(irb, coro_scope, node, promise_var, coro_frame_type_value, nullptr, undef);
IrInstruction *coro_promise_ptr = ir_build_var_ptr(irb, coro_scope, node, promise_var, false, false);
coro_promise_ptr = ir_build_var_ptr(irb, coro_scope, node, promise_var, false, false);
VariableTableEntry *await_handle_var = ir_create_var(irb, node, coro_scope, nullptr, false, false, true, const_bool_false);
IrInstruction *null_value = ir_build_const_null(irb, coro_scope, node);
@ -6471,7 +6483,7 @@ bool ir_gen(CodeGen *codegen, AstNode *node, Scope *scope, IrExecutable *ir_exec
IrInstruction *return_addresses_ptr = ir_build_field_ptr(irb, scope, node, coro_promise_ptr, return_addresses_field_name);
Buf *err_ret_trace_field_name = buf_create_from_str(ERR_RET_TRACE_FIELD_NAME);
IrInstruction *err_ret_trace_ptr = ir_build_field_ptr(irb, scope, node, coro_promise_ptr, err_ret_trace_field_name);
err_ret_trace_ptr = ir_build_field_ptr(irb, scope, node, coro_promise_ptr, err_ret_trace_field_name);
ir_build_mark_err_ret_trace_ptr(irb, scope, node, err_ret_trace_ptr);
// coordinate with builtin.zig
@ -6536,6 +6548,12 @@ bool ir_gen(CodeGen *codegen, AstNode *node, Scope *scope, IrExecutable *ir_exec
IrInstruction *size_of_ret_val = ir_build_size_of(irb, scope, node, return_type_inst);
ir_build_memcpy(irb, scope, node, result_ptr_as_u8_ptr, return_value_ptr_as_u8_ptr, size_of_ret_val);
}
if (irb->codegen->have_err_ret_tracing) {
Buf *err_ret_trace_ptr_field_name = buf_create_from_str(ERR_RET_TRACE_PTR_FIELD_NAME);
IrInstruction *err_ret_trace_ptr_field_ptr = ir_build_field_ptr(irb, scope, node, coro_promise_ptr, err_ret_trace_ptr_field_name);
IrInstruction *dest_err_ret_trace_ptr = ir_build_load_ptr(irb, scope, node, err_ret_trace_ptr_field_ptr);
ir_build_merge_err_ret_traces(irb, scope, node, coro_promise_ptr, err_ret_trace_ptr, dest_err_ret_trace_ptr);
}
ir_build_br(irb, scope, node, check_free_block, const_bool_false);
ir_set_cursor_at_end_and_append_block(irb, irb->exec->coro_final_cleanup_block);
@ -13098,6 +13116,7 @@ static IrInstruction *ir_analyze_container_member_access_inner(IrAnalyze *ira,
{
if (!is_slice(bare_struct_type)) {
ScopeDecls *container_scope = get_container_scope(bare_struct_type);
assert(container_scope != nullptr);
auto entry = container_scope->decl_table.maybe_get(field_name);
Tld *tld = entry ? entry->value : nullptr;
if (tld && tld->id == TldIdFn) {
@ -17948,12 +17967,16 @@ static TypeTableEntry *ir_analyze_instruction_merge_err_ret_traces(IrAnalyze *ir
return out_val->type;
}
IrInstruction *err_ret_trace_ptr = instruction->err_ret_trace_ptr->other;
if (type_is_invalid(err_ret_trace_ptr->value.type))
IrInstruction *src_err_ret_trace_ptr = instruction->src_err_ret_trace_ptr->other;
if (type_is_invalid(src_err_ret_trace_ptr->value.type))
return ira->codegen->builtin_types.entry_invalid;
IrInstruction *dest_err_ret_trace_ptr = instruction->dest_err_ret_trace_ptr->other;
if (type_is_invalid(dest_err_ret_trace_ptr->value.type))
return ira->codegen->builtin_types.entry_invalid;
IrInstruction *result = ir_build_merge_err_ret_traces(&ira->new_irb, instruction->base.scope,
instruction->base.source_node, coro_promise_ptr, err_ret_trace_ptr);
instruction->base.source_node, coro_promise_ptr, src_err_ret_trace_ptr, dest_err_ret_trace_ptr);
ir_link_new_instruction(result, &instruction->base);
result->value.type = ira->codegen->builtin_types.entry_void;
return result->value.type;

4
src/ir_print.cpp
View File

@ -1192,7 +1192,9 @@ static void ir_print_merge_err_ret_traces(IrPrint *irp, IrInstructionMergeErrRet
fprintf(irp->f, "@mergeErrRetTraces(");
ir_print_other_instruction(irp, instruction->coro_promise_ptr);
fprintf(irp->f, ",");
ir_print_other_instruction(irp, instruction->err_ret_trace_ptr);
ir_print_other_instruction(irp, instruction->src_err_ret_trace_ptr);
fprintf(irp->f, ",");
ir_print_other_instruction(irp, instruction->dest_err_ret_trace_ptr);
fprintf(irp->f, ")");
}

9
test/cases/coroutines.zig
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@ -191,13 +191,20 @@ async fn failing() !void {
return error.Fail;
}
test "error return trace across suspend points" {
test "error return trace across suspend points - early return" {
const p = nonFailing();
resume p;
const p2 = try async<std.debug.global_allocator> printTrace(p);
cancel p2;
}
test "error return trace across suspend points - async return" {
const p = nonFailing();
const p2 = try async<std.debug.global_allocator> printTrace(p);
resume p;
cancel p2;
}
fn nonFailing() promise->error!void {
return async<std.debug.global_allocator> suspendThenFail() catch unreachable;
}