================
@@ -614,44 +614,82 @@ static std::optional<std::string>
GetFileNameByLoadAddress(HANDLE hProcess,
return dos_path;
}
+// Determine how many bytes can be read at `addr` in `hProcess` before crossing
+// out of the committed memory region containing it. Returns 0 if the address
is
+// not within a committed region.
+static SIZE_T BytesReadableAt(HANDLE hProcess, LPCVOID addr) {
+ MEMORY_BASIC_INFORMATION mbi{};
+ if (!::VirtualQueryEx(hProcess, addr, &mbi, sizeof(mbi)))
+ return 0;
+ if (mbi.State != MEM_COMMIT)
+ return 0;
+ uintptr_t region_end =
+ reinterpret_cast<uintptr_t>(mbi.BaseAddress) + mbi.RegionSize;
+ uintptr_t a = reinterpret_cast<uintptr_t>(addr);
+ if (a >= region_end)
+ return 0;
----------------
charles-zablit wrote:
It should not happen, no. I replaced the if with an assert to clarify the
invariant.
https://github.com/llvm/llvm-project/pull/200230
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