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zig/test/stack_traces.zig
Cody Tapscott eda3eb1561 stage2: "Pop" error trace for break/return within catch 
This implement trace "popping" for correctly handled errors within
`catch { ... }` and `else { ... }` blocks.

When breaking from these blocks with any non-error, we pop the error
trace frames corresponding to the operand. When breaking with an error,
we preserve the frames so that error traces "chain" together as usual.

```zig
fn foo(cond1: bool, cond2: bool) !void {
    bar() catch {
    	if (cond1) {
	    // If baz() result is a non-error, pop the error trace frames from bar()
	    // If baz() result is an error, leave the bar() frames on the error trace
            return baz();
	} else if (cond2) {
	    // If we break/return an error, then leave the error frames from bar() on the error trace
	    return error.Foo;
	}
    };

    // An error returned from here does not include bar()'s error frames in the trace
    return error.Bar;
}
```

Notice that if foo() does not return an error it, it leaves no extra
frames on the error trace.

This is piece (1/3) of https://github.com/ziglang/zig/issues/1923#issuecomment-1218495574
2022-10-21 10:43:42 -07:00

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const std = @import("std");
const os = std.os;
const tests = @import("tests.zig");
pub fn addCases(cases: *tests.StackTracesContext) void {
cases.addCase(.{
.name = "return",
.source =
\\pub fn main() !void {
\\ return error.TheSkyIsFalling;
\\}
,
.Debug = .{
.expect =
\\error: TheSkyIsFalling
\\source.zig:2:5: [address] in main (test)
\\ return error.TheSkyIsFalling;
\\ ^
\\
,
},
.ReleaseSafe = .{
.exclude_os = .{
.windows, // TODO
.linux, // defeated by aggressive inlining
},
.expect =
\\error: TheSkyIsFalling
\\source.zig:2:5: [address] in [function]
\\ return error.TheSkyIsFalling;
\\ ^
\\
,
},
.ReleaseFast = .{
.expect =
\\error: TheSkyIsFalling
\\
,
},
.ReleaseSmall = .{
.expect =
\\error: TheSkyIsFalling
\\
,
},
});
cases.addCase(.{
.name = "try return",
.source =
\\fn foo() !void {
\\ return error.TheSkyIsFalling;
\\}
\\
\\pub fn main() !void {
\\ try foo();
\\}
,
.Debug = .{
.expect =
\\error: TheSkyIsFalling
\\source.zig:2:5: [address] in foo (test)
\\ return error.TheSkyIsFalling;
\\ ^
\\source.zig:6:5: [address] in main (test)
\\ try foo();
\\ ^
\\
,
},
.ReleaseSafe = .{
.exclude_os = .{
.windows, // TODO
},
.expect =
\\error: TheSkyIsFalling
\\source.zig:2:5: [address] in [function]
\\ return error.TheSkyIsFalling;
\\ ^
\\source.zig:6:5: [address] in [function]
\\ try foo();
\\ ^
\\
,
},
.ReleaseFast = .{
.expect =
\\error: TheSkyIsFalling
\\
,
},
.ReleaseSmall = .{
.expect =
\\error: TheSkyIsFalling
\\
,
},
});
cases.addCase(.{
.name = "try return + handled catch/if-else",
.source =
\\fn foo() !void {
\\ return error.TheSkyIsFalling;
\\}
\\
\\pub fn main() !void {
\\ foo() catch {}; // should not affect error trace
\\ if (foo()) |_| {} else |_| {
\\ // should also not affect error trace
\\ }
\\ try foo();
\\}
,
.Debug = .{
.expect =
\\error: TheSkyIsFalling
\\source.zig:2:5: [address] in foo (test)
\\ return error.TheSkyIsFalling;
\\ ^
\\source.zig:10:5: [address] in main (test)
\\ try foo();
\\ ^
\\
,
},
.ReleaseSafe = .{
.exclude_os = .{
.windows, // TODO
.linux, // defeated by aggressive inlining
},
.expect =
\\error: TheSkyIsFalling
\\source.zig:2:5: [address] in [function]
\\ return error.TheSkyIsFalling;
\\ ^
\\source.zig:10:5: [address] in [function]
\\ try foo();
\\ ^
\\
,
},
.ReleaseFast = .{
.expect =
\\error: TheSkyIsFalling
\\
,
},
.ReleaseSmall = .{
.expect =
\\error: TheSkyIsFalling
\\
,
},
});
cases.addCase(.{
.name = "try return from within catch",
.source =
\\fn foo() !void {
\\ return error.TheSkyIsFalling;
\\}
\\
\\fn bar() !void {
\\ return error.AndMyCarIsOutOfGas;
\\}
\\
\\pub fn main() !void {
\\ foo() catch { // error trace should include foo()
\\ try bar();
\\ };
\\}
,
.Debug = .{
.expect =
\\error: AndMyCarIsOutOfGas
\\source.zig:2:5: [address] in foo (test)
\\ return error.TheSkyIsFalling;
\\ ^
\\source.zig:6:5: [address] in bar (test)
\\ return error.AndMyCarIsOutOfGas;
\\ ^
\\source.zig:11:9: [address] in main (test)
\\ try bar();
\\ ^
\\
,
},
.ReleaseSafe = .{
.exclude_os = .{
.windows, // TODO
},
.expect =
\\error: AndMyCarIsOutOfGas
\\source.zig:2:5: [address] in [function]
\\ return error.TheSkyIsFalling;
\\ ^
\\source.zig:6:5: [address] in [function]
\\ return error.AndMyCarIsOutOfGas;
\\ ^
\\source.zig:11:9: [address] in [function]
\\ try bar();
\\ ^
\\
,
},
.ReleaseFast = .{
.expect =
\\error: AndMyCarIsOutOfGas
\\
,
},
.ReleaseSmall = .{
.expect =
\\error: AndMyCarIsOutOfGas
\\
,
},
});
cases.addCase(.{
.name = "try return from within if-else",
.source =
\\fn foo() !void {
\\ return error.TheSkyIsFalling;
\\}
\\
\\fn bar() !void {
\\ return error.AndMyCarIsOutOfGas;
\\}
\\
\\pub fn main() !void {
\\ if (foo()) |_| {} else |_| { // error trace should include foo()
\\ try bar();
\\ }
\\}
,
.Debug = .{
.expect =
\\error: AndMyCarIsOutOfGas
\\source.zig:2:5: [address] in foo (test)
\\ return error.TheSkyIsFalling;
\\ ^
\\source.zig:6:5: [address] in bar (test)
\\ return error.AndMyCarIsOutOfGas;
\\ ^
\\source.zig:11:9: [address] in main (test)
\\ try bar();
\\ ^
\\
,
},
.ReleaseSafe = .{
.exclude_os = .{
.windows, // TODO
},
.expect =
\\error: AndMyCarIsOutOfGas
\\source.zig:2:5: [address] in [function]
\\ return error.TheSkyIsFalling;
\\ ^
\\source.zig:6:5: [address] in [function]
\\ return error.AndMyCarIsOutOfGas;
\\ ^
\\source.zig:11:9: [address] in [function]
\\ try bar();
\\ ^
\\
,
},
.ReleaseFast = .{
.expect =
\\error: AndMyCarIsOutOfGas
\\
,
},
.ReleaseSmall = .{
.expect =
\\error: AndMyCarIsOutOfGas
\\
,
},
});
cases.addCase(.{
.name = "try try return return",
.source =
\\fn foo() !void {
\\ try bar();
\\}
\\
\\fn bar() !void {
\\ return make_error();
\\}
\\
\\fn make_error() !void {
\\ return error.TheSkyIsFalling;
\\}
\\
\\pub fn main() !void {
\\ try foo();
\\}
,
.Debug = .{
.expect =
\\error: TheSkyIsFalling
\\source.zig:10:5: [address] in make_error (test)
\\ return error.TheSkyIsFalling;
\\ ^
\\source.zig:6:5: [address] in bar (test)
\\ return make_error();
\\ ^
\\source.zig:2:5: [address] in foo (test)
\\ try bar();
\\ ^
\\source.zig:14:5: [address] in main (test)
\\ try foo();
\\ ^
\\
,
},
.ReleaseSafe = .{
.exclude_os = .{
.windows, // TODO
},
.expect =
\\error: TheSkyIsFalling
\\source.zig:10:5: [address] in [function]
\\ return error.TheSkyIsFalling;
\\ ^
\\source.zig:6:5: [address] in [function]
\\ return make_error();
\\ ^
\\source.zig:2:5: [address] in [function]
\\ try bar();
\\ ^
\\source.zig:14:5: [address] in [function]
\\ try foo();
\\ ^
\\
,
},
.ReleaseFast = .{
.expect =
\\error: TheSkyIsFalling
\\
,
},
.ReleaseSmall = .{
.expect =
\\error: TheSkyIsFalling
\\
,
},
});
cases.addCase(.{
.exclude_os = .{
.openbsd, // integer overflow
.windows, // TODO intermittent failures
},
.name = "dumpCurrentStackTrace",
.source =
\\const std = @import("std");
\\
\\fn bar() void {
\\ std.debug.dumpCurrentStackTrace(@returnAddress());
\\}
\\fn foo() void {
\\ bar();
\\}
\\pub fn main() u8 {
\\ foo();
\\ return 1;
\\}
,
.Debug = .{
.expect =
\\source.zig:7:8: [address] in foo (test)
\\ bar();
\\ ^
\\source.zig:10:8: [address] in main (test)
\\ foo();
\\ ^
\\
,
},
});
}
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