米6体育平台手机版

SLAU131V October 2004 – February 2020

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8.5.7.5 Checking the Consistency of Allocators

The linker checks the consistency of load and run allocations specified for unions, groups, and sections. The following rules are used:

Run allocations are only allowed for top-level sections, groups, or unions (sections, groups, or unions that are not nested under any other groups or unions). The linker uses the run address of the top-level structure to compute the run addresses of the components within groups and unions.
The linker does not accept a load allocation for UNIONs.
The linker does not accept a load allocation for uninitialized sections.
In most cases, you must provide a load allocation for an initialized section. However, the linker does not accept a load allocation for an initialized section that is located within a group that already defines a load allocator.
As a shortcut, you can specify a load allocation for an entire group, to determine the load allocations for every initialized section or subgroup nested within the group. However, a load allocation is accepted for an entire group only if all of the following conditions are true:
- The group is initialized (that is, it has at least one initialized member).
- The group is not nested inside another group that has a load allocator.
- The group does not contain a union containing initialized sections.
If the group contains a union with initialized sections, it is necessary to specify the load allocation for each initialized section nested within the group. Consider the following example:

    SECTIONS
    {
      GROUP: load = SLOW_MEM, run = SLOW_MEM
      {
       .text1:
       UNION:
       {
        .text2:
        .text3:
       }
      }
    }

The load allocator given for the group does not uniquely specify the load allocation for the elements within the union: .text2 and .text3. In this case, the linker issues a diagnostic message to request that these load allocations be specified explicitly.