diff options
Diffstat (limited to 'libgo/runtime/runtime.c')
| -rw-r--r-- | libgo/runtime/runtime.c | 81 |
1 files changed, 66 insertions, 15 deletions
diff --git a/libgo/runtime/runtime.c b/libgo/runtime/runtime.c index 48ece55..138e5af 100644 --- a/libgo/runtime/runtime.c +++ b/libgo/runtime/runtime.c @@ -10,14 +10,27 @@ #include "array.h" #include "go-panic.h" +// The GOTRACEBACK environment variable controls the +// behavior of a Go program that is crashing and exiting. +// GOTRACEBACK=0 suppress all tracebacks +// GOTRACEBACK=1 default behavior - show tracebacks but exclude runtime frames +// GOTRACEBACK=2 show tracebacks including runtime frames +// GOTRACEBACK=crash show tracebacks including runtime frames, then crash (core dump etc) int32 -runtime_gotraceback(void) +runtime_gotraceback(bool *crash) { const byte *p; + if(crash != nil) + *crash = false; p = runtime_getenv("GOTRACEBACK"); if(p == nil || p[0] == '\0') return 1; // default is on + if(runtime_strcmp((const char *)p, "crash") == 0) { + if(crash != nil) + *crash = true; + return 2; // extra information + } return runtime_atoi(p); } @@ -44,6 +57,11 @@ runtime_progname() return argc == 0 ? nil : argv[0]; } +// Information about what cpu features are available. +// Set on startup in asm_{x86/amd64}.s. +uint32 runtime_cpuid_ecx; +uint32 runtime_cpuid_edx; + void runtime_goargs(void) { @@ -90,6 +108,52 @@ runtime_atoi(const byte *p) return n; } +static struct root_list runtime_roots = +{ nil, + { { &syscall_Envs, sizeof syscall_Envs }, + { &os_Args, sizeof os_Args }, + { nil, 0 } }, +}; + +static void +TestAtomic64(void) +{ + uint64 z64, x64; + + z64 = 42; + x64 = 0; + PREFETCH(&z64); + if(runtime_cas64(&z64, &x64, 1)) + runtime_throw("cas64 failed"); + if(x64 != 42) + runtime_throw("cas64 failed"); + if(!runtime_cas64(&z64, &x64, 1)) + runtime_throw("cas64 failed"); + if(x64 != 42 || z64 != 1) + runtime_throw("cas64 failed"); + if(runtime_atomicload64(&z64) != 1) + runtime_throw("load64 failed"); + runtime_atomicstore64(&z64, (1ull<<40)+1); + if(runtime_atomicload64(&z64) != (1ull<<40)+1) + runtime_throw("store64 failed"); + if(runtime_xadd64(&z64, (1ull<<40)+1) != (2ull<<40)+2) + runtime_throw("xadd64 failed"); + if(runtime_atomicload64(&z64) != (2ull<<40)+2) + runtime_throw("xadd64 failed"); + if(runtime_xchg64(&z64, (3ull<<40)+3) != (2ull<<40)+2) + runtime_throw("xchg64 failed"); + if(runtime_atomicload64(&z64) != (3ull<<40)+3) + runtime_throw("xchg64 failed"); +} + +void +runtime_check(void) +{ + __go_register_gc_roots(&runtime_roots); + + TestAtomic64(); +} + uint32 runtime_fastrand1(void) { @@ -105,19 +169,6 @@ runtime_fastrand1(void) return x; } -static struct root_list runtime_roots = -{ nil, - { { &syscall_Envs, sizeof syscall_Envs }, - { &os_Args, sizeof os_Args }, - { nil, 0 } }, -}; - -void -runtime_check(void) -{ - __go_register_gc_roots(&runtime_roots); -} - int64 runtime_cputicks(void) { @@ -139,7 +190,7 @@ runtime_showframe(String s, bool current) if(current && runtime_m()->throwing > 0) return 1; if(traceback < 0) - traceback = runtime_gotraceback(); + traceback = runtime_gotraceback(nil); return traceback > 1 || (__builtin_memchr(s.str, '.', s.len) != nil && __builtin_memcmp(s.str, "runtime.", 7) != 0); } |