applyOffset

Since register rules are applied (usually) during a panic, checked addition / subtraction is used so that we can return an error and fall back to FP-based unwinding.

Function parameters

Parameters

base:usize
offset:i64

How is this different than `Module` when the host is Windows?

Types

WindowsModule: How is this different than `Module` when the host is Windows?
UnwindContext
VirtualMachine: This is a virtual machine that runs DWARF call frame instructions.

Functions in this namespace

Functions

open
init
deinit
getModuleForAddress
getModuleNameForAddress
readElfDebugInfo: Reads debug info from an ELF file, or the current binary if none in specified.
unwindFrameMachO: Unwind a frame using MachO compact unwind info (from __unwind_info).
stripInstructionPtrAuthCode: Some platforms use pointer authentication - the upper bits of instruction pointers contain a signature.
unwindFrameDwarf: Unwind a stack frame using DWARF unwinding info, updating the register context.
supportsUnwinding: Tells whether unwinding for this target is *implemented* here in the Zig

Error sets in this namespace

Error Sets

OpenError

Tells whether unwinding for the host is implemented.

Values

supports_unwinding: Tells whether unwinding for the host is implemented.

Source

Implementation

fn applyOffset(base: usize, offset: i64) !usize {
    return if (offset >= 0)
        try std.math.add(usize, base, @as(usize, @intCast(offset)))
    else
        try std.math.sub(usize, base, @as(usize, @intCast(-offset)));
}