zig

commit 8b6ea9ffe78480f9c73e9dee24edc5975c7f064e (tree)
parent 4cb2f11693b1bf13770b8ad6a8b8a1e37101a516
Author: Andrew Kelley <andrew@ziglang.org>
Date:   Tue, 21 Dec 2021 14:32:02 -0700

C backend: implement `ret_addr`

Diffstat:
M
src/codegen/c.zig
 | 
4
+++-
M
src/link/C/zig.h
 | 
14
++++++++++++++

2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/src/codegen/c.zig b/src/codegen/c.zig
@@ -2214,7 +2214,9 @@ fn airBreakpoint(f: *Function) !CValue {
 }
 
 fn airRetAddr(f: *Function) !CValue {
-    return f.fail("TODO implement codegen for airRetAddr", .{});
+    const local = try f.allocLocal(Type.usize, .Const);
+    try f.object.writer().writeAll(" = zig_return_address();\n");
+    return local;
 }
 
 fn airFence(f: *Function, inst: Air.Inst.Index) !CValue {
diff --git a/src/link/C/zig.h b/src/link/C/zig.h
@@ -60,6 +60,20 @@
 #define zig_breakpoint() raise(SIGTRAP)
 #endif
 
+#if defined(_MSC_VER)
+#define zig_return_address() _ReturnAddress()
+#elif defined(__GNUC__)
+#define zig_return_address() __builtin_extract_return_addr(__builtin_return_address(0))
+#else
+#define zig_return_address() 0
+#endif
+
+#if defined(__GNUC__)
+#define zig_frame_address() __builtin_frame_address(0)
+#else
+#define zig_frame_address() 0
+#endif
+
 #if __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_ATOMICS__)
 #include <stdatomic.h>
 #define zig_cmpxchg_strong(obj, expected, desired, succ, fail) atomic_compare_exchange_strong_explicit(obj, &(expected), desired, succ, fail)