米6体育平台手机版

SLAU131V October 2004 – February 2020

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Example 15. Nesting GROUP and UNION Statements

SECTIONS
{
   GROUP 0x1000 : run = FAST_MEM
   {
      UNION:
      {
         mysect1: load = SLOW_MEM
         mysect2: load = SLOW_MEM
      }
      UNION:
      {
         mysect3: load = SLOW_MEM
         mysect4: load = SLOW_MEM
      }
   }
}

For this example, the linker performs the following allocations:

The four sections (mysect1, mysect2, mysect3, mysect4) are assigned unique, non-overlapping load addresses. The name you defined with the .label directive is used in the SLOW_MEM memory region. This assignment is determined by the particular load allocations given for each section.
Sections mysect1 and mysect2 are assigned the same run address in FAST_MEM.
Sections mysect3 and mysect4 are assigned the same run address in FAST_MEM.
The run addresses of mysect1/mysect2 and mysect3/mysect4 are allocated contiguously, as directed by the GROUP statement (subject to alignment and blocking restrictions).

To refer to groups and unions, linker diagnostic messages use the notation:

GROUP_n UNION_n

where n is a sequential number (beginning at 1) that represents the lexical ordering of the group or union in the linker control file without regard to nesting. Groups and unions each have their own counter.