e2d7cd685d
This patch makes the dead_on_return parameter attribute optionally require a number
of bytes to be passed in to specify the number of bytes known to be dead
upon function return/unwind. This is aimed at enabling annotating the
this pointer in C++ destructors with dead_on_return in clang. We need
this to handle cases like the following:
```
struct X {
int n;
~X() {
this[n].n = 0;
}
};
void f() {
X xs[] = {42, -1};
}
```
Where we only certain that sizeof(X) bytes are dead upon return of ~X.
Otherwise DSE would be able to eliminate the store in ~X which would not
be correct.
This patch only does the wiring within IR. Future patches will make
clang emit correct sizing information and update DSE to only delete
stores to objects marked dead_on_return that are provably in bounds of
the number of bytes specified to be dead_on_return.
Reviewers: nikic, alinas, antoniofrighetto
Pull Request: https://github.com/llvm/llvm-project/pull/171712
184 lines
7.2 KiB
C++
184 lines
7.2 KiB
C++
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --filter "^define |^entry:" --version 2
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// RUN: %clang_cc1 -triple riscv32 -emit-llvm %s -o - \
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// RUN: | FileCheck -check-prefixes=ILP32-ILP32F-ILP32D,ILP32-ILP32F,ILP32 %s
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// RUN: %clang_cc1 -triple riscv32 -target-feature +f -target-abi ilp32f -emit-llvm %s -o - \
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// RUN: | FileCheck -check-prefixes=ILP32-ILP32F-ILP32D,ILP32F-ILP32D,ILP32-ILP32F,ILP32F %s
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// RUN: %clang_cc1 -triple riscv32 -target-feature +f -target-feature +d -target-abi ilp32d -emit-llvm %s -o - \
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// RUN: | FileCheck -check-prefixes=ILP32-ILP32F-ILP32D,ILP32F-ILP32D,ILP32D %s
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// RUN: %clang_cc1 -triple riscv64 -emit-llvm %s -o - \
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// RUN: | FileCheck -check-prefixes=LP64-LP64F-LP64D,LP64-LP64F,LP64 %s
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// RUN: %clang_cc1 -triple riscv64 -target-feature +f -target-abi lp64f -emit-llvm %s -o - \
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// RUN: | FileCheck -check-prefixes=LP64-LP64F-LP64D,LP64F-LP64D,LP64-LP64F,LP64F %s
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// RUN: %clang_cc1 -triple riscv64 -target-feature +f -target-feature +d -target-abi lp64d -emit-llvm %s -o - \
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// RUN: | FileCheck -check-prefixes=LP64-LP64F-LP64D,LP64F-LP64D,LP64D %s
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#include <stdint.h>
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// Ensure that fields inherited from a parent struct are treated in the same
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// way as fields directly in the child for the purposes of RISC-V ABI rules.
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struct parent1_int32_s {
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int32_t i1;
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};
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struct child1_int32_s : parent1_int32_s {
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int32_t i2;
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};
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// ILP32-ILP32F-ILP32D-LABEL: define dso_local [2 x i32] @_Z30int32_int32_struct_inheritance14child1_int32_s
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// ILP32-ILP32F-ILP32D-SAME: ([2 x i32] [[A_COERCE:%.*]]) #[[ATTR0:[0-9]+]] {
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// ILP32-ILP32F-ILP32D: entry:
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//
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// LP64-LP64F-LP64D-LABEL: define dso_local i64 @_Z30int32_int32_struct_inheritance14child1_int32_s
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// LP64-LP64F-LP64D-SAME: (i64 [[A_COERCE:%.*]]) #[[ATTR0:[0-9]+]] {
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// LP64-LP64F-LP64D: entry:
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//
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struct child1_int32_s int32_int32_struct_inheritance(struct child1_int32_s a) {
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return a;
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}
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struct parent2_int32_s {
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int32_t i1;
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};
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struct child2_float_s : parent2_int32_s {
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float f1;
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};
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// ILP32-LABEL: define dso_local [2 x i32] @_Z30int32_float_struct_inheritance14child2_float_s
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// ILP32-SAME: ([2 x i32] [[A_COERCE:%.*]]) #[[ATTR0]] {
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// ILP32: entry:
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//
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// ILP32F-ILP32D-LABEL: define dso_local { i32, float } @_Z30int32_float_struct_inheritance14child2_float_s
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// ILP32F-ILP32D-SAME: (i32 [[TMP0:%.*]], float [[TMP1:%.*]]) #[[ATTR0]] {
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// ILP32F-ILP32D: entry:
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//
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// LP64-LABEL: define dso_local i64 @_Z30int32_float_struct_inheritance14child2_float_s
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// LP64-SAME: (i64 [[A_COERCE:%.*]]) #[[ATTR0]] {
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// LP64: entry:
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//
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// LP64F-LP64D-LABEL: define dso_local { i32, float } @_Z30int32_float_struct_inheritance14child2_float_s
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// LP64F-LP64D-SAME: (i32 [[TMP0:%.*]], float [[TMP1:%.*]]) #[[ATTR0]] {
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// LP64F-LP64D: entry:
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//
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struct child2_float_s int32_float_struct_inheritance(struct child2_float_s a) {
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return a;
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}
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struct parent3_float_s {
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float f1;
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};
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struct child3_int64_s : parent3_float_s {
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int64_t i1;
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};
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// ILP32-ILP32F-ILP32D-LABEL: define dso_local void @_Z30float_int64_struct_inheritance14child3_int64_s
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// ILP32-ILP32F-ILP32D-SAME: (ptr dead_on_unwind noalias writable sret([[STRUCT_CHILD3_INT64_S:%.*]]) align 8 [[AGG_RESULT:%.*]], ptr noundef dead_on_return [[A:%.*]]) #[[ATTR0]] {
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// ILP32-ILP32F-ILP32D: entry:
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//
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// LP64-LABEL: define dso_local [2 x i64] @_Z30float_int64_struct_inheritance14child3_int64_s
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// LP64-SAME: ([2 x i64] [[A_COERCE:%.*]]) #[[ATTR0]] {
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// LP64: entry:
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//
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// LP64F-LP64D-LABEL: define dso_local { float, i64 } @_Z30float_int64_struct_inheritance14child3_int64_s
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// LP64F-LP64D-SAME: (float [[TMP0:%.*]], i64 [[TMP1:%.*]]) #[[ATTR0]] {
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// LP64F-LP64D: entry:
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//
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struct child3_int64_s float_int64_struct_inheritance(struct child3_int64_s a) {
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return a;
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}
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struct parent4_double_s {
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double d1;
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};
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struct child4_double_s : parent4_double_s {
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double d1;
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};
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// ILP32-ILP32F-LABEL: define dso_local void @_Z32double_double_struct_inheritance15child4_double_s
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// ILP32-ILP32F-SAME: (ptr dead_on_unwind noalias writable sret([[STRUCT_CHILD4_DOUBLE_S:%.*]]) align 8 [[AGG_RESULT:%.*]], ptr noundef dead_on_return [[A:%.*]]) #[[ATTR0]] {
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// ILP32-ILP32F: entry:
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//
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// ILP32D-LABEL: define dso_local { double, double } @_Z32double_double_struct_inheritance15child4_double_s
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// ILP32D-SAME: (double [[TMP0:%.*]], double [[TMP1:%.*]]) #[[ATTR0]] {
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// ILP32D: entry:
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//
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// LP64-LP64F-LABEL: define dso_local [2 x i64] @_Z32double_double_struct_inheritance15child4_double_s
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// LP64-LP64F-SAME: ([2 x i64] [[A_COERCE:%.*]]) #[[ATTR0]] {
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// LP64-LP64F: entry:
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//
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// LP64D-LABEL: define dso_local { double, double } @_Z32double_double_struct_inheritance15child4_double_s
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// LP64D-SAME: (double [[TMP0:%.*]], double [[TMP1:%.*]]) #[[ATTR0]] {
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// LP64D: entry:
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//
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struct child4_double_s double_double_struct_inheritance(struct child4_double_s a) {
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return a;
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}
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// When virtual inheritance is used, the resulting struct isn't eligible for
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// passing in registers.
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struct parent5_virtual_s {
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int32_t i1;
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};
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struct child5_virtual_s : virtual parent5_virtual_s {
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float f1;
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};
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// ILP32-ILP32F-ILP32D-LABEL: define dso_local void @_Z38int32_float_virtual_struct_inheritance16child5_virtual_s
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// ILP32-ILP32F-ILP32D-SAME: (ptr dead_on_unwind noalias writable sret([[STRUCT_CHILD5_VIRTUAL_S:%.*]]) align 4 [[AGG_RESULT:%.*]], ptr noundef dead_on_return [[A:%.*]]) #[[ATTR0]] {
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// ILP32-ILP32F-ILP32D: entry:
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//
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// LP64-LP64F-LP64D-LABEL: define dso_local void @_Z38int32_float_virtual_struct_inheritance16child5_virtual_s
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// LP64-LP64F-LP64D-SAME: (ptr dead_on_unwind noalias writable sret([[STRUCT_CHILD5_VIRTUAL_S:%.*]]) align 8 [[AGG_RESULT:%.*]], ptr noundef dead_on_return [[A:%.*]]) #[[ATTR0]] {
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// LP64-LP64F-LP64D: entry:
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//
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struct child5_virtual_s int32_float_virtual_struct_inheritance(struct child5_virtual_s a) {
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return a;
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}
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// Check for correct lowering in the presence of diamond inheritance.
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struct parent6_float_s {
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float f1;
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};
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struct child6a_s : parent6_float_s {
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};
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struct child6b_s : parent6_float_s {
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};
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struct grandchild_6_s : child6a_s, child6b_s {
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};
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// ILP32F-ILP64D: define{{.*}} { float, float } @_Z38float_float_diamond_struct_inheritance14grandchild_6_s(float %0, float %1)
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// ILP32-LABEL: define dso_local [2 x i32] @_Z38float_float_diamond_struct_inheritance14grandchild_6_s
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// ILP32-SAME: ([2 x i32] [[A_COERCE:%.*]]) #[[ATTR0]] {
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// ILP32: entry:
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//
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// ILP32F-ILP32D-LABEL: define dso_local { float, float } @_Z38float_float_diamond_struct_inheritance14grandchild_6_s
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// ILP32F-ILP32D-SAME: (float [[TMP0:%.*]], float [[TMP1:%.*]]) #[[ATTR0]] {
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// ILP32F-ILP32D: entry:
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//
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// LP64-LABEL: define dso_local i64 @_Z38float_float_diamond_struct_inheritance14grandchild_6_s
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// LP64-SAME: (i64 [[A_COERCE:%.*]]) #[[ATTR0]] {
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// LP64: entry:
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//
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// LP64F-LP64D-LABEL: define dso_local { float, float } @_Z38float_float_diamond_struct_inheritance14grandchild_6_s
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// LP64F-LP64D-SAME: (float [[TMP0:%.*]], float [[TMP1:%.*]]) #[[ATTR0]] {
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// LP64F-LP64D: entry:
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//
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struct grandchild_6_s float_float_diamond_struct_inheritance(struct grandchild_6_s a) {
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return a;
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}
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// NOTE: These prefixes are unused. Do not add tests below this line:
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//// NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
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// ILP32F: {{.*}}
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// LP64F: {{.*}}
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