authorgravatar for andrew@ziglang.orgAndrew Kelley <andrew@ziglang.org> 2021-12-21 14:32:02-07:00
committergravatar for andrew@ziglang.orgAndrew Kelley <andrew@ziglang.org> 2021-12-21 14:32:02-07:00
log8b6ea9ffe78480f9c73e9dee24edc5975c7f064e
treefbd338ce3434338ab29336fae2022037db1514b7
parent4cb2f11693b1bf13770b8ad6a8b8a1e37101a516

C backend: implement `ret_addr`

2 files changed, 17 insertions(+), 1 deletions(-)

src/codegen/c.zig+3-1
...@@ -2214,7 +2214,9 @@ fn airBreakpoint(f: *Function) !CValue {...@@ -2214,7 +2214,9 @@ fn airBreakpoint(f: *Function) !CValue {
2214}2214}
22152215
2216fn airRetAddr(f: *Function) !CValue {2216fn airRetAddr(f: *Function) !CValue {
2217 return f.fail("TODO implement codegen for airRetAddr", .{});2217 const local = try f.allocLocal(Type.usize, .Const);
2218 try f.object.writer().writeAll(" = zig_return_address();\n");
2219 return local;
2218}2220}
22192221
2220fn airFence(f: *Function, inst: Air.Inst.Index) !CValue {2222fn airFence(f: *Function, inst: Air.Inst.Index) !CValue {
src/link/C/zig.h+14
...@@ -60,6 +60,20 @@...@@ -60,6 +60,20 @@
60#define zig_breakpoint() raise(SIGTRAP)60#define zig_breakpoint() raise(SIGTRAP)
61#endif61#endif
6262
63#if defined(_MSC_VER)
64#define zig_return_address() _ReturnAddress()
65#elif defined(__GNUC__)
66#define zig_return_address() __builtin_extract_return_addr(__builtin_return_address(0))
67#else
68#define zig_return_address() 0
69#endif
70
71#if defined(__GNUC__)
72#define zig_frame_address() __builtin_frame_address(0)
73#else
74#define zig_frame_address() 0
75#endif
76
63#if __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_ATOMICS__)77#if __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_ATOMICS__)
64#include <stdatomic.h>78#include <stdatomic.h>
65#define zig_cmpxchg_strong(obj, expected, desired, succ, fail) atomic_compare_exchange_strong_explicit(obj, &(expected), desired, succ, fail)79#define zig_cmpxchg_strong(obj, expected, desired, succ, fail) atomic_compare_exchange_strong_explicit(obj, &(expected), desired, succ, fail)