riscv64 fix: Handle relaxation reductions of more than 65536 bytes

Upstream commit:
https://github.com/llvm/llvm-project/commit/9d37ea95df1b84cca9b5e954d8964c976a5e303e

Already needed at least by ports/math/hdf5, prerequisite if we want to
enable linker relaxation (clang upstream defaults).

ok kettenis@

diff --git a/gnu/llvm/lld/ELF/Arch/RISCV.cpp b/gnu/llvm/lld/ELF/Arch/RISCV.cpp
index b0864b5..4811d50 100644 (file)
--- a/gnu/llvm/lld/ELF/Arch/RISCV.cpp
+++ b/gnu/llvm/lld/ELF/Arch/RISCV.cpp
@@ -621,7 +621,7 @@ static bool relax(InputSection &sec) {
   // iteration.
   DenseMap<const Defined *, uint64_t> valueDelta;
   ArrayRef<SymbolAnchor> sa = ArrayRef(aux.anchors);
-  uint32_t delta = 0;
+  uint64_t delta = 0;
   for (auto [i, r] : llvm::enumerate(sec.relocs())) {
     for (; sa.size() && sa[0].offset <= r.offset; sa = sa.slice(1))
       if (!sa[0].end)
@@ -688,8 +688,8 @@ static bool relax(InputSection &sec) {
       a.d->value -= delta - valueDelta.find(a.d)->second;
   }
   // Inform assignAddresses that the size has changed.
-  if (!isUInt<16>(delta))
-    fatal("section size decrease is too large");
+  if (!isUInt<32>(delta))
+    fatal("section size decrease is too large: " + Twine(delta));
   sec.bytesDropped = delta;
   return changed;
 }

diff --git a/gnu/llvm/lld/ELF/InputSection.h b/gnu/llvm/lld/ELF/InputSection.h
index 356ccda..143384b 100644 (file)
--- a/gnu/llvm/lld/ELF/InputSection.h
+++ b/gnu/llvm/lld/ELF/InputSection.h
@@ -137,7 +137,7 @@ public:
   // Used by --optimize-bb-jumps and RISC-V linker relaxation temporarily to
   // indicate the number of bytes which is not counted in the size. This should
   // be reset to zero after uses.
-  uint16_t bytesDropped = 0;
+  uint32_t bytesDropped = 0;
 
   mutable bool compressed = false;
 
@@ -401,7 +401,7 @@ private:
   template <class ELFT> void copyShtGroup(uint8_t *buf);
 };
 
-static_assert(sizeof(InputSection) <= 152, "InputSection is too big");
+static_assert(sizeof(InputSection) <= 160, "InputSection is too big");
 
 class SyntheticSection : public InputSection {
 public: