Function load_addr

cranelift/codegen/src/legalizer/globalvalue.rs:120–147

Expand a `global_value` instruction for a load global.

(
    inst: ir::Inst,
    func: &mut ir::Function,
    base: ir::GlobalValue,
    offset: ir::immediates::Offset32,
    global_type: ir::Type,
    flags: ir::MemFlagsData,
    isa: &dyn TargetIsa,
)

/// Expand a `global_value` instruction for a load global.
fn load_addr(
    inst: ir::Inst,
    func: &mut ir::Function,
    base: ir::GlobalValue,
    offset: ir::immediates::Offset32,
    global_type: ir::Type,
    flags: ir::MemFlagsData,
    isa: &dyn TargetIsa,
) -> WalkCommand {
    // We need to load a pointer from the `base` global value, so insert a new `global_value`
    // instruction. This depends on the iterative legalization loop. Note that the IR verifier
    // detects any cycles in the `load` globals.
    let ptr_ty = isa.pointer_type();

    let mut pos = FuncCursor::new(func).at_inst(inst);
    pos.use_srcloc(inst);

    // Get the value for the base.
    let base_addr = pos.ins().global_value(ptr_ty, base);

    // Perform the load.
    pos.func
        .replace(inst)
        .load(global_type, flags, base_addr, offset);

    // Need to legalize the `global_value` for the base address.
    WalkCommand::Revisit
}

/// Expand a `global_value` instruction for a symbolic name global.
fn symbol(