mirror of
https://github.com/ziglang/zig.git
synced 2025-12-06 06:13:07 +00:00
c1a5caa454
`castTruncatedData` was a poorly worded error (all shrinking casts "truncate bits", it's just that we assume those bits to be zext/sext of the other bits!), and `negativeToUnsigned` was a pointless distinction which forced the compiler to emit worse code (since two separate safety checks were required for casting e.g. 'i32' to 'u16') and wasn't even implemented correctly. This commit combines those safety panics into one function, `integerOutOfBounds`. The name maybe isn't perfect, but that's not hugely important; what matters is the new default message, which is clearer than the old ones: "integer does not fit in destination type".
141 lines
5.9 KiB
Plaintext
141 lines
5.9 KiB
Plaintext
#target=x86_64-linux-selfhosted
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#target=x86_64-linux-cbe
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#target=x86_64-windows-cbe
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#update=initial version
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#file=main.zig
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pub fn main() !u8 {
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var a: u8 = undefined;
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a = 255;
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_ = a + 1;
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return 1;
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}
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const no_panic = std.debug.no_panic;
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pub const panic = struct {
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pub const call = myPanic;
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pub fn integerOverflow() noreturn {
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@panic("integer overflow");
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}
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pub const sentinelMismatch = no_panic.sentinelMismatch;
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pub const unwrapError = no_panic.unwrapError;
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pub const outOfBounds = no_panic.outOfBounds;
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pub const startGreaterThanEnd = no_panic.startGreaterThanEnd;
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pub const inactiveUnionField = no_panic.inactiveUnionField;
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pub const sliceCastLenRemainder = no_panic.sliceCastLenRemainder;
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pub const reachedUnreachable = no_panic.reachedUnreachable;
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pub const unwrapNull = no_panic.unwrapNull;
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pub const castToNull = no_panic.castToNull;
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pub const incorrectAlignment = no_panic.incorrectAlignment;
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pub const invalidErrorCode = no_panic.invalidErrorCode;
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pub const integerOutOfBounds = no_panic.integerOutOfBounds;
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pub const shlOverflow = no_panic.shlOverflow;
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pub const shrOverflow = no_panic.shrOverflow;
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pub const divideByZero = no_panic.divideByZero;
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pub const exactDivisionRemainder = no_panic.exactDivisionRemainder;
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pub const integerPartOutOfBounds = no_panic.integerPartOutOfBounds;
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pub const corruptSwitch = no_panic.corruptSwitch;
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pub const shiftRhsTooBig = no_panic.shiftRhsTooBig;
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pub const invalidEnumValue = no_panic.invalidEnumValue;
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pub const forLenMismatch = no_panic.forLenMismatch;
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pub const copyLenMismatch = no_panic.copyLenMismatch;
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pub const memcpyAlias = no_panic.memcpyAlias;
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pub const noreturnReturned = no_panic.noreturnReturned;
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};
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fn myPanic(msg: []const u8, _: ?usize) noreturn {
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std.io.getStdOut().writer().print("panic message: {s}\n", .{msg}) catch {};
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std.process.exit(0);
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}
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const std = @import("std");
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#expect_stdout="panic message: integer overflow\n"
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#update=change the panic handler body
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#file=main.zig
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pub fn main() !u8 {
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var a: u8 = undefined;
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a = 255;
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_ = a + 1;
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return 1;
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}
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const no_panic = std.debug.no_panic;
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pub const panic = struct {
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pub const call = myPanic;
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pub fn integerOverflow() noreturn {
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@panic("integer overflow");
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}
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pub const sentinelMismatch = no_panic.sentinelMismatch;
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pub const unwrapError = no_panic.unwrapError;
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pub const outOfBounds = no_panic.outOfBounds;
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pub const startGreaterThanEnd = no_panic.startGreaterThanEnd;
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pub const inactiveUnionField = no_panic.inactiveUnionField;
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pub const sliceCastLenRemainder = no_panic.sliceCastLenRemainder;
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pub const reachedUnreachable = no_panic.reachedUnreachable;
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pub const unwrapNull = no_panic.unwrapNull;
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pub const castToNull = no_panic.castToNull;
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pub const incorrectAlignment = no_panic.incorrectAlignment;
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pub const invalidErrorCode = no_panic.invalidErrorCode;
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pub const integerOutOfBounds = no_panic.integerOutOfBounds;
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pub const shlOverflow = no_panic.shlOverflow;
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pub const shrOverflow = no_panic.shrOverflow;
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pub const divideByZero = no_panic.divideByZero;
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pub const exactDivisionRemainder = no_panic.exactDivisionRemainder;
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pub const integerPartOutOfBounds = no_panic.integerPartOutOfBounds;
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pub const corruptSwitch = no_panic.corruptSwitch;
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pub const shiftRhsTooBig = no_panic.shiftRhsTooBig;
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pub const invalidEnumValue = no_panic.invalidEnumValue;
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pub const forLenMismatch = no_panic.forLenMismatch;
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pub const copyLenMismatch = no_panic.copyLenMismatch;
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pub const memcpyAlias = no_panic.memcpyAlias;
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pub const noreturnReturned = no_panic.noreturnReturned;
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};
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fn myPanic(msg: []const u8, _: ?usize) noreturn {
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std.io.getStdOut().writer().print("new panic message: {s}\n", .{msg}) catch {};
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std.process.exit(0);
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}
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const std = @import("std");
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#expect_stdout="new panic message: integer overflow\n"
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#update=change the panic handler function value
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#file=main.zig
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pub fn main() !u8 {
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var a: u8 = undefined;
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a = 255;
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_ = a + 1;
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return 1;
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}
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const no_panic = std.debug.no_panic;
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pub const panic = struct {
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pub const call = myPanicNew;
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pub fn integerOverflow() noreturn {
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@panic("integer overflow");
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}
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pub const sentinelMismatch = std.debug.no_panic.sentinelMismatch;
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pub const unwrapError = std.debug.no_panic.unwrapError;
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pub const outOfBounds = std.debug.no_panic.outOfBounds;
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pub const startGreaterThanEnd = std.debug.no_panic.startGreaterThanEnd;
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pub const inactiveUnionField = std.debug.no_panic.inactiveUnionField;
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pub const sliceCastLenRemainder = no_panic.sliceCastLenRemainder;
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pub const reachedUnreachable = no_panic.reachedUnreachable;
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pub const unwrapNull = no_panic.unwrapNull;
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pub const castToNull = no_panic.castToNull;
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pub const incorrectAlignment = no_panic.incorrectAlignment;
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pub const invalidErrorCode = no_panic.invalidErrorCode;
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pub const integerOutOfBounds = no_panic.integerOutOfBounds;
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pub const shlOverflow = no_panic.shlOverflow;
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pub const shrOverflow = no_panic.shrOverflow;
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pub const divideByZero = no_panic.divideByZero;
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pub const exactDivisionRemainder = no_panic.exactDivisionRemainder;
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pub const integerPartOutOfBounds = no_panic.integerPartOutOfBounds;
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pub const corruptSwitch = no_panic.corruptSwitch;
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pub const shiftRhsTooBig = no_panic.shiftRhsTooBig;
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pub const invalidEnumValue = no_panic.invalidEnumValue;
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pub const forLenMismatch = no_panic.forLenMismatch;
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pub const copyLenMismatch = no_panic.copyLenMismatch;
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pub const memcpyAlias = no_panic.memcpyAlias;
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pub const noreturnReturned = no_panic.noreturnReturned;
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};
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fn myPanicNew(msg: []const u8, _: ?usize) noreturn {
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std.io.getStdOut().writer().print("third panic message: {s}\n", .{msg}) catch {};
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std.process.exit(0);
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}
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const std = @import("std");
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#expect_stdout="third panic message: integer overflow\n"
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