[compiler-rt] 3929458 - sanitizer_common: Remove Fuchsia support for reading flags from files

[Roland McGrath via llvm-commits]

Author: Roland McGrath
Date: 2022-03-28T10:54:04-07:00
New Revision: 39294589bf02a8f420430687be8a9c665d2f79dd

URL: https://github.com/llvm/llvm-project/commit/39294589bf02a8f420430687be8a9c665d2f79dd
DIFF: https://github.com/llvm/llvm-project/commit/39294589bf02a8f420430687be8a9c665d2f79dd.diff

LOG: sanitizer_common: Remove Fuchsia support for reading flags from files

This has never really been used in practice.  Fuchsia is moving
away from the support this requires, so don't use it.

Reviewed By: phosek

Differential Revision: https://reviews.llvm.org/D122500

Added: 
    

Modified: 
    compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp

Removed: 
    


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diff  --git a/compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp
index 398d3b8f154ce..848953a6ab007 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp
@@ -386,29 +386,8 @@ void GetMemoryProfile(fill_profile_f cb, uptr *stats) {}
 
 bool ReadFileToBuffer(const char *file_name, char **buff, uptr *buff_size,
                       uptr *read_len, uptr max_len, error_t *errno_p) {
-  zx_handle_t vmo;
-  zx_status_t status = __sanitizer_get_configuration(file_name, &vmo);
-  if (status == ZX_OK) {
-    uint64_t vmo_size;
-    status = _zx_vmo_get_size(vmo, &vmo_size);
-    if (status == ZX_OK) {
-      if (vmo_size < max_len)
-        max_len = vmo_size;
-      size_t map_size = RoundUpTo(max_len, GetPageSize());
-      uintptr_t addr;
-      status = _zx_vmar_map(_zx_vmar_root_self(), ZX_VM_PERM_READ, 0, vmo, 0,
-                            map_size, &addr);
-      if (status == ZX_OK) {
-        *buff = reinterpret_cast<char *>(addr);
-        *buff_size = map_size;
-        *read_len = max_len;
-      }
-    }
-    _zx_handle_close(vmo);
-  }
-  if (status != ZX_OK && errno_p)
-    *errno_p = status;
-  return status == ZX_OK;
+  *errno_p = ZX_ERR_NOT_SUPPORTED;
+  return false;
 }
 
 void RawWrite(const char *buffer) {