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link_reloc_apply.c (1282B)

      1 /* The single public relocation byte-patcher entry.
      2  *
      3  * link_reloc_apply() is the "one encoder, three loaders" boundary (doc/OBJ.md):
      4  * the static linker, JIT linker, assembler, and emulator guest loader all call
      5  * it unchanged.  It first tries the arch-neutral data-word encoders in obj-core
      6  * (reloc_apply_neutral), then routes instruction-immediate kinds to the owning
      7  * backend via LinkArchDesc.reloc_apply_insn, panicking only if neither claims
      8  * the kind.
      9  *
     10  * It lives in src/link (not obj-core) because resolving the per-arch slice
     11  * needs link_arch_desc_for() — housing the dispatcher in obj-core would invert
     12  * the obj->link boundary, exactly as for WS-B's reloc_desc().  The neutral
     13  * encoders it delegates to stay pure obj-core.  See doc/plan/RELOC.md (WS-C).
     14  */
     15 
     16 #include "core/core.h"
     17 #include "link/link_arch.h"
     18 #include "obj/reloc_apply.h"
     19 
     20 void link_reloc_apply(Compiler* c, RelocKind k, u8* P_bytes, u64 S, i64 A,
     21                       u64 P) {
     22   const LinkArchDesc* d;
     23   if (reloc_apply_neutral(c, k, P_bytes, S, A, P)) return;
     24   d = link_arch_desc_for(c);
     25   if (d && d->reloc_apply_insn && d->reloc_apply_insn(c, k, P_bytes, S, A, P))
     26     return;
     27   compiler_panic(c, SRCLOC_NONE, "link: unsupported reloc kind %u",
     28                  (unsigned)k);
     29 }