[lld] [LLD][ELF] Skip non-SHF_ALLOC sections when checking max VA and max VA difference in relaxOnce() (PR #145863)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-lld-elf

Author: Mingjie Xu (Enna1)

<details>
<summary>Changes</summary>

For non-SHF_ALLOC sections, sh_addr is set to 0.
Skip sections without SHF_ALLOC flag, so `minVA` will not be set to 0 with non-SHF_ALLOC sections, and the size of non-SHF_ALLOC sections will not contribute to `maxVA`.

---
Full diff: https://github.com/llvm/llvm-project/pull/145863.diff


1 Files Affected:

- (modified) lld/ELF/Arch/X86_64.cpp (+2) 


``````````diff
diff --git a/lld/ELF/Arch/X86_64.cpp b/lld/ELF/Arch/X86_64.cpp
index 163505102d0ec..488f4803b2cb4 100644
--- a/lld/ELF/Arch/X86_64.cpp
+++ b/lld/ELF/Arch/X86_64.cpp
@@ -320,6 +320,8 @@ bool X86_64::deleteFallThruJmpInsn(InputSection &is, InputFile *file,
 bool X86_64::relaxOnce(int pass) const {
   uint64_t minVA = UINT64_MAX, maxVA = 0;
   for (OutputSection *osec : ctx.outputSections) {
+    if (!(osec->flags & SHF_ALLOC))
+      continue;
     minVA = std::min(minVA, osec->addr);
     maxVA = std::max(maxVA, osec->addr + osec->size);
   }

``````````

</details>


https://github.com/llvm/llvm-project/pull/145863