search for: __builtin_longjmp

...char *argv[]) { void *buf[20]; __attribute__((__aligned__(64))) char q; // realign the stack char *p = __builtin_alloca(argc); // dynamic alloca if (__builtin_setjmp(buf)) { *p = 'p'; q = 'q'; return 0; } asm("movq $0, %rbx"); __builtin_longjmp(buf, 1); } LLVM is choosing to use rbx as a base pointer to access p and q, but during builtin_setjmp, rbx is not saved; when the longjmp is executed rbx may have a garbage value. GCC on the other hand, is using rbp, which is saved in the jump buffer. Is this a bug in LLVM, or am I using __buil...

Hi all, currently we lower the __builtin_setjmp/__builtin_longjmp intrinsincs to SjLj exception style intrinsics. For ARM on non-Darwin, they end up as nops, breaking Ruby. This leads to the question of what the defined semantics of them is. (a) Are they supposed to be compatible with libc? PPC disagrees in comments. (b) Are they supposed to be compatible with...

Does the X86 backend (or any other backend) correctly implement support for __builtin_setjmp and __builtin_longjmp? I don't get the correct result when I compile and run the following code with clang. # clang foo.c -O3; ./a.out #include <stdio.h> void *buf[20]; void __attribute__((noinline)) foo (void) { __builtin_longjmp (buf, 1); } int main (int argc, char** argv) { if (__builtin_setjmp (buf)...

...andling. Calling them directly like this is very much not recommended. Using the system library setjmp()/longjmp() functions is preferred. -Jim On Apr 12, 2011, at 1:56 PM, Akira Hatanaka wrote: > Does the X86 backend (or any other backend) correctly implement support for __builtin_setjmp and __builtin_longjmp? > I don't get the correct result when I compile and run the following code with clang. > > # clang foo.c -O3; ./a.out > > #include <stdio.h> > void *buf[20]; > void __attribute__((noinline)) > foo (void) > { > __builtin_longjmp (buf, 1); > } > &gt...

Hi, Building the following C code I get a call instruction that has no noreturn attribute, while the function itself does have it. void foo(void **b) { __builtin_longjmp(b, 1); } define void @_Z3fooPPv(i8** %b) noreturn nounwind uwtable { entry: %0 = bitcast i8** %b to i8* tail call void @llvm.eh.sjlj.longjmp(i8* %0) <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<...

...his is very much not recommended. > Using the system library setjmp()/longjmp() functions is preferred. > > -Jim > > On Apr 12, 2011, at 1:56 PM, Akira Hatanaka wrote: > > > Does the X86 backend (or any other backend) correctly implement support > for __builtin_setjmp and __builtin_longjmp? > > I don't get the correct result when I compile and run the following code > with clang. > > > > # clang foo.c -O3; ./a.out > > > > #include <stdio.h> > > void *buf[20]; > > void __attribute__((noinline)) > > foo (void) > > { &gt...

...ttp://llvm.org/docs/doxygen/html/Instructions_8cpp_source.html#l00345 Nuno ----- Original Message ----- > Hi, > > Building the following C code I get a call instruction that has no > noreturn > attribute, while the function itself does have it. > > void foo(void **b) { > __builtin_longjmp(b, 1); > } > > > define void @_Z3fooPPv(i8** %b) noreturn nounwind uwtable { > entry: > %0 = bitcast i8** %b to i8* > tail call void @llvm.eh.sjlj.longjmp(i8* %0) > <<<<<<<<<<<<<<<<<<<<<<<<<<<...

Hi Kostya, On 28/11/12 14:47, Kostya Serebryany wrote: > Hi, > > Building the following C code I get a call instruction that has no noreturn > attribute, while the function itself does have it. > > void foo(void **b) { > __builtin_longjmp(b, 1); > } > > > define void @_Z3fooPPv(i8** %b) noreturn nounwind uwtable { > entry: > %0 = bitcast i8** %b to i8* > tail call void @llvm.eh.sjlj.longjmp(i8* %0) > <<<<<<<<<<<<<<<<<<<<<<<<<<...

...like this is very much not recommended. Using the system library setjmp()/longjmp() functions is preferred. > > -Jim > > On Apr 12, 2011, at 1:56 PM, Akira Hatanaka wrote: > > > Does the X86 backend (or any other backend) correctly implement support for __builtin_setjmp and __builtin_longjmp? > > I don't get the correct result when I compile and run the following code with clang. > > > > # clang foo.c -O3; ./a.out > > > > #include <stdio.h> > > void *buf[20]; > > void __attribute__((noinline)) > > foo (void) > > { > &gt...

...-O3 -S -ccc-host-triple > arm-unknown-darwin -ccc-clang-archs arm > $ llc setjmp6.arm.ll -o setjmp6.arm.s > > > #include <stdio.h> > #include <stdlib.h> > void *buf[20]; > > int gi2 = 0; > > > void __attribute__ ((noinline)) sub2 (void) > { > __builtin_longjmp (buf, 1); > > } > > int > main (int argc, char **argv) > { > int n = atoi (argv[1]); > int r = __builtin_setjmp (buf); > ++gi2; > > if (r) > { > printf ("setjmp %d\n", n + gi2); > return 0; > } > > sub2 (); &...

...t; > > > > > > > #include <stdio.h> > > > #include <stdlib.h> > > > void *buf[20]; > > > > > > int gi2 = 0; > > > > > > > > > void __attribute__ ((noinline)) sub2 (void) > > > { > > > __builtin_longjmp (buf, 1); > > > > > > } > > > > > > int > > > main (int argc, char **argv) > > > { > > > int n = atoi (argv[1]); > > > int r = __builtin_setjmp (buf); > > > ++gi2; > > > > > > if (r) > >...

.... Clang recognizes two forms of setjmp (all I say here applies to longjmp similarly): * __builtin_setjmp: gets lowered to calling the llvm.sjlj.setjmp intrinsic * setjmp() library call does not appear to be handled specially, although a no-longer-comment in a test I removed in r181468 said: "__builtin_longjmp/setjmp should get transformed into llvm.setjmp/longjmp > just like explicit setjmp/longjmp calls are." On my Ubuntu machine, the call actually gets transcibed to calling _setjmp, but that may be due to compiler settings in system library headers. LLVM. LLVM supports two flavors of setj...

...of attached file). $ clang setjmp6.c -o setjmp6.arm.ll -emit-llvm -O3 -S -ccc-host-triple arm-unknown-darwin -ccc-clang-archs arm $ llc setjmp6.arm.ll -o setjmp6.arm.s #include <stdio.h> #include <stdlib.h> void *buf[20]; int gi2 = 0; void __attribute__ ((noinline)) sub2 (void) { __builtin_longjmp (buf, 1); } int main (int argc, char **argv) { int n = atoi (argv[1]); int r = __builtin_setjmp (buf); ++gi2; if (r) { printf ("setjmp %d\n", n + gi2); return 0; } sub2 (); return 0; } On Wed, Apr 13, 2011 at 10:05 AM, Jakob Stoklund Olesen <stoklu...

On Apr 13, 2011, at 9:51 AM, Akira Hatanaka wrote: > int > main (int argc, char** argv) > { > int n = atoi(argv[1]), r; > > if ((r = setjmp (buf))) > { > printf("n = %d\n", n); > return 0; > } Non-volatile local variables are not preserved by setjmp(), so this program can print whatever it wants. /jakob

...arm > > $ llc setjmp6.arm.ll -o setjmp6.arm.s > > > > > > #include <stdio.h> > > #include <stdlib.h> > > void *buf[20]; > > > > int gi2 = 0; > > > > > > void __attribute__ ((noinline)) sub2 (void) > > { > > __builtin_longjmp (buf, 1); > > > > } > > > > int > > main (int argc, char **argv) > > { > > int n = atoi (argv[1]); > > int r = __builtin_setjmp (buf); > > ++gi2; > > > > if (r) > > { > > printf ("setjmp %d\n",...

...-O3 -S -ccc-host-triple arm-unknown-darwin -ccc-clang-archs arm > $ llc setjmp6.arm.ll -o setjmp6.arm.s > > > #include <stdio.h> > #include <stdlib.h> > void *buf[20]; > > int gi2 = 0; > > > void __attribute__ ((noinline)) sub2 (void) > { > __builtin_longjmp (buf, 1); > > } > > int > main (int argc, char **argv) > { > int n = atoi (argv[1]); > int r = __builtin_setjmp (buf); > ++gi2; > > if (r) > { > printf ("setjmp %d\n", n + gi2); > return 0; > } > > sub2 (...

Hi, I'm trying to implement __builtin_setjmp / __builtin_longjmp for Sparc processors. I think I'm very close, but I can't work out how to issue BuildMI-type instructions to load the address of the recovery location (set in setjmp) into a register using the SETHI / OR combination. I can't see any equivalent code anywhere else in Sparc. I imagine thi...

...arm > > $ llc setjmp6.arm.ll -o setjmp6.arm.s > > > > > > #include <stdio.h> > > #include <stdlib.h> > > void *buf[20]; > > > > int gi2 = 0; > > > > > > void __attribute__ ((noinline)) sub2 (void) > > { > > __builtin_longjmp (buf, 1); > > > > } > > > > int > > main (int argc, char **argv) > > { > > int n = atoi (argv[1]); > > int r = __builtin_setjmp (buf); > > ++gi2; > > > > if (r) > > { > > printf ("setjmp %d\n",...

Folks, As of this run: http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15-full/builds/746 There are three classes of failures that need fixing before we get the bot green: 1. AddressSanitizer.BuiltinLongJmpTest Unit Test Two configurations fail: * Asan-arm-inline-Test * Asan-arm-with-calls-Test I wonder what's the best way to run it individually and reduce the error. I'm not

...r, "v*v*", "n") BUILTIN(__builtin_frame_address, "v*IUi", "n") +BUILTIN(__builtin_stack_pointer, "v*", "n") BUILTIN(__builtin_flt_rounds, "i", "nc") BUILTIN(__builtin_setjmp, "iv**", "j") BUILTIN(__builtin_longjmp, "vv**i", "r") diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp index d187678..f66f506 100644 --- a/lib/CodeGen/CGBuiltin.cpp +++ b/lib/CodeGen/CGBuiltin.cpp @@ -736,6 +736,11 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD, Value *F = CG...