fuzzer: account for runtime address slide

This is relevant to PIEs, which are notably enabled by default on macOS.
The build system needs to only see virtual addresses, that is, those
which do not have the slide applied; but the fuzzer itself naturally
sees relocated addresses (i.e. with the slide applied). We just need to
subtract the slide when we communicate addresses to the build system.

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/std/debug/SelfInfo/Windows.zig b/lib/std/debug/SelfInfo/Windows.zig
index 70009217db..306287a9e7 100644
--- a/lib/std/debug/SelfInfo/Windows.zig
+++ b/lib/std/debug/SelfInfo/Windows.zig
@@ -33,6 +33,12 @@ pub fn getModuleName(si: *SelfInfo, gpa: Allocator, address: usize) Error![]cons
     const module = try si.findModule(gpa, address);
     return module.name;
 }
+pub fn getModuleSlide(si: *SelfInfo, gpa: Allocator, address: usize) Error!usize {
+    si.mutex.lock();
+    defer si.mutex.unlock();
+    const module = try si.findModule(gpa, address);
+    return module.base_address;
+}
 
 pub const can_unwind: bool = switch (builtin.cpu.arch) {
     else => true,