[PATCH] D61626: [RISCV] Disable tail call if the callee function contain __builtin_frame_address or __builtin_return_address

[Shiva Chen via Phabricator via llvm-commits]

shiva0217 created this revision.
shiva0217 added reviewers: asb, apazos.
Herald added subscribers: benna, psnobl, jocewei, PkmX, rkruppe, the_o, brucehoult, MartinMosbeck, rogfer01, edward-jones, zzheng, jrtc27, kito-cheng, niosHD, sabuasal, simoncook, johnrusso, rbar.
Herald added a project: LLVM.

Disable tail call if the callee function contain __builtin_frame_address or __builtin_return_address.
Otherwise,  tail call optimization will remove the frame pointer and return address restoration which will make the above two builtin functions get incorrect value.

E.g.

  void *callee (char *p) { return __builtin_return_address (1); }
  void *caller (void) { char *save = (char*) alloca (4); return callee (save); }


Repository:
  rL LLVM

https://reviews.llvm.org/D61626

Files:
  lib/Target/RISCV/RISCVISelLowering.cpp
  test/CodeGen/RISCV/builtin-frame-address.ll
  test/CodeGen/RISCV/builtin-return-address.ll

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