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ac991bbb44
With commit r351627, LLVM gained the ability to apply (existing) IPO
optimizations on indirections through callbacks, or transitive calls.
The general idea is that we use an abstraction to hide the middle man
and represent the callback call in the context of the initial caller.
It is described in more detail in the commit message of the LLVM patch
r351627, the llvm::AbstractCallSite class description, and the
language reference section on callback-metadata.
This commit enables clang to emit !callback metadata that is
understood by LLVM. It does so in three different cases:
1) For known broker functions declarations that are directly
generated, e.g., __kmpc_fork_call for the OpenMP pragma parallel.
2) For known broker functions that are identified by their name and
source location through the builtin detection, e.g.,
pthread_create from the POSIX thread API.
3) For user annotated functions that carry the "callback(callee, ...)"
attribute. The attribute has to include the name, or index, of
the callback callee and how the passed arguments can be
identified (as many as the callback callee has). See the callback
attribute documentation for detailed information.
Differential Revision: https://reviews.llvm.org/D55483
llvm-svn: 351629
56 lines
2.2 KiB
C++
56 lines
2.2 KiB
C++
// RUN: %clang_cc1 -triple i386-unknown-unknown %s -emit-llvm -o - | FileCheck %s
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struct Base {
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void no_args_1(void (*callback)(void));
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__attribute__((callback(1))) void no_args_2(void (*callback1)(void), void (*callback2)(void));
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__attribute__((callback(callback1))) void no_args_3(void (*callback1)(void), void (*callback2)(void));
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// TODO: There should probably be a warning or even an error for different
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// callbacks on the same method.
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__attribute__((callback(1))) virtual void
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virtual_1(void (*callback)(void));
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__attribute__((callback(callback, this, __, this))) virtual void
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this_unknown_this(void (*callback)(Base *, Base *, Base *));
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};
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// CHECK-DAG: define void @_ZN4Base9no_args_1EPFvvE({{[^!]*!callback}} ![[cid0:[0-9]+]]
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__attribute__((callback(1))) void
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Base::no_args_1(void (*callback)(void)) {
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}
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// CHECK-DAG: define void @_ZN4Base9no_args_2EPFvvES1_({{[^!]*!callback}} ![[cid1:[0-9]+]]
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__attribute__((callback(2))) void Base::no_args_2(void (*callback1)(void), void (*callback2)(void)) {
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}
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// CHECK-DAG: define void @_ZN4Base9no_args_3EPFvvES1_({{[^!]*!callback}} ![[cid1]]
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__attribute__((callback(callback2))) void Base::no_args_3(void (*callback1)(void), void (*callback2)(void)) {
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}
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// CHECK-DAG: define void @_ZN4Base17this_unknown_thisEPFvPS_S0_S0_E({{[^!]*!callback}} ![[cid2:[0-9]+]]
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void Base::this_unknown_this(void (*callback)(Base *, Base *, Base *)) {
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}
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struct Derived_1 : public Base {
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__attribute__((callback(1))) virtual void
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virtual_1(void (*callback)(void)) override;
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};
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// CHECK-DAG: define void @_ZN9Derived_19virtual_1EPFvvE({{[^!]*!callback}} ![[cid0]]
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void Derived_1::virtual_1(void (*callback)(void)) {}
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struct Derived_2 : public Base {
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void virtual_1(void (*callback)(void)) override;
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};
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// CHECK-DAG: define void @_ZN9Derived_29virtual_1EPFvvE
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// CHECK-NOT: !callback
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void Derived_2::virtual_1(void (*callback)(void)) {}
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// CHECK-DAG: ![[cid0]] = !{![[cid0b:[0-9]+]]}
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// CHECK-DAG: ![[cid0b]] = !{i64 1, i1 false}
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// CHECK-DAG: ![[cid1]] = !{![[cid1b:[0-9]+]]}
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// CHECK-DAG: ![[cid1b]] = !{i64 2, i1 false}
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// CHECK-DAG: ![[cid2]] = !{![[cid2b:[0-9]+]]}
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// CHECK-DAG: ![[cid2b]] = !{i64 1, i64 0, i64 -1, i64 0, i1 false}
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