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Stack unwind is very difficult. Therefore, adapt testing to the safest of conditions: probe firing in a stack that we compiled with no optimization, -fno-omit-frame-pointer, no tail call optimizations, and no leaf function optimizations. Further, adapt the test to take better advantage of test suite infrastructure for triggers and results checking. The "strsize" argument has no effect. Its value is silently ignored, and strsize==0 is assumed. When a pid entry probe fires, the stack frame is not yet set up. Therefore, the immediate caller will be missing from the call stack. Signed-off-by: Eugene Loh <eugene.loh@oracle.com> Reviewed-by: Kris Van Hees <kris.van.hees@oracle.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| /* | ||
| * Oracle Linux DTrace. | ||
| * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved. | ||
| * Licensed under the Universal Permissive License v 1.0 as shown at | ||
| * http://oss.oracle.com/licenses/upl. | ||
| */ | ||
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| int mycallee(int i) { | ||
| return i ^ 1; | ||
| } | ||
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| int myfunc_z() { | ||
| int i = 1; | ||
|
|
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| /* call another function to prevent leaf call optimizations */ | ||
| i = mycallee(i); | ||
|
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| /* endless loop, profile-n probe will fire here */ | ||
| while (i < 3) | ||
| i = 2 * i - 1; | ||
|
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| return i; | ||
| } | ||
|
|
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| /* have a relatively deep stack; ^1 prevents tail calls */ | ||
| int myfunc_y() { return myfunc_z() ^ 1; } | ||
| int myfunc_x() { return myfunc_y() ^ 1; } | ||
| int myfunc_w() { return myfunc_x() ^ 1; } | ||
| int myfunc_v() { return myfunc_w() ^ 1; } | ||
| int myfunc_u() { return myfunc_v() ^ 1; } | ||
| int myfunc_t() { return myfunc_u() ^ 1; } | ||
| int myfunc_s() { return myfunc_t() ^ 1; } | ||
| int myfunc_r() { return myfunc_s() ^ 1; } | ||
| int myfunc_q() { return myfunc_r() ^ 1; } | ||
| int myfunc_p() { return myfunc_q() ^ 1; } | ||
| int myfunc_o() { return myfunc_p() ^ 1; } | ||
| int myfunc_n() { return myfunc_o() ^ 1; } | ||
| int myfunc_m() { return myfunc_n() ^ 1; } | ||
| int myfunc_l() { return myfunc_m() ^ 1; } | ||
| int myfunc_k() { return myfunc_l() ^ 1; } | ||
| int myfunc_j() { return myfunc_k() ^ 1; } | ||
| int myfunc_i() { return myfunc_j() ^ 1; } | ||
| int myfunc_h() { return myfunc_i() ^ 1; } | ||
| int myfunc_g() { return myfunc_h() ^ 1; } | ||
| int myfunc_f() { return myfunc_g() ^ 1; } | ||
| int myfunc_e() { return myfunc_f() ^ 1; } | ||
| int myfunc_d() { return myfunc_e() ^ 1; } | ||
| int myfunc_c() { return myfunc_d() ^ 1; } | ||
| int myfunc_b() { return myfunc_c() ^ 1; } | ||
| int myfunc_a() { return myfunc_b() ^ 1; } | ||
| int myfunc_Z() { return myfunc_a() ^ 1; } | ||
| int myfunc_Y() { return myfunc_Z() ^ 1; } | ||
| int myfunc_X() { return myfunc_Y() ^ 1; } | ||
| int myfunc_W() { return myfunc_X() ^ 1; } | ||
| int myfunc_V() { return myfunc_W() ^ 1; } | ||
| int myfunc_U() { return myfunc_V() ^ 1; } | ||
| int myfunc_T() { return myfunc_U() ^ 1; } | ||
| int myfunc_S() { return myfunc_T() ^ 1; } | ||
| int myfunc_R() { return myfunc_S() ^ 1; } | ||
| int myfunc_Q() { return myfunc_R() ^ 1; } | ||
| int myfunc_P() { return myfunc_Q() ^ 1; } | ||
| int myfunc_O() { return myfunc_P() ^ 1; } | ||
| int myfunc_N() { return myfunc_O() ^ 1; } | ||
| int myfunc_M() { return myfunc_N() ^ 1; } | ||
| int myfunc_L() { return myfunc_M() ^ 1; } | ||
| int myfunc_K() { return myfunc_L() ^ 1; } | ||
| int myfunc_J() { return myfunc_K() ^ 1; } | ||
| int myfunc_I() { return myfunc_J() ^ 1; } | ||
| int myfunc_H() { return myfunc_I() ^ 1; } | ||
| int myfunc_G() { return myfunc_H() ^ 1; } | ||
| int myfunc_F() { return myfunc_G() ^ 1; } | ||
| int myfunc_E() { return myfunc_F() ^ 1; } | ||
| int myfunc_D() { return myfunc_E() ^ 1; } | ||
| int myfunc_C() { return myfunc_D() ^ 1; } | ||
| int myfunc_B() { return myfunc_C() ^ 1; } | ||
| int myfunc_A() { return myfunc_B() ^ 1; } | ||
| int myfunc_9() { return myfunc_A() ^ 1; } | ||
| int myfunc_8() { return myfunc_9() ^ 1; } | ||
| int myfunc_7() { return myfunc_8() ^ 1; } | ||
| int myfunc_6() { return myfunc_7() ^ 1; } | ||
| int myfunc_5() { return myfunc_6() ^ 1; } | ||
| int myfunc_4() { return myfunc_5() ^ 1; } | ||
| int myfunc_3() { return myfunc_4() ^ 1; } | ||
| int myfunc_2() { return myfunc_3() ^ 1; } | ||
| int myfunc_1() { return myfunc_2() ^ 1; } | ||
| int myfunc_0() { return myfunc_1() ^ 1; } | ||
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| int main(int c, char **v) { | ||
| return myfunc_0() ^ 1; | ||
| } |
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