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Prevent calls to __jit_debug_register_code from being optimized out.

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Patch by Andrew MacPherson. I just tweaked the comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199350 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-01-16 04:50:58 +00:00
parent 6a8151dba1
commit 59c2fe1af1
1 changed files with 5 additions and 1 deletions
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6
lib/ExecutionEngine/RuntimeDyld/GDBRegistrar.cpp
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@ -47,7 +47,11 @@ extern "C" {
struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 }; struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 };
// Debuggers puts a breakpoint in this function. // Debuggers puts a breakpoint in this function.
LLVM_ATTRIBUTE_NOINLINE void __jit_debug_register_code() { } LLVM_ATTRIBUTE_NOINLINE void __jit_debug_register_code() {
// The noinline and the asm prevent calls to this function from being
// optimized out.
asm volatile("":::"memory");
}
} }