derek.holloway
7502bf64a4
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59 lines
2.3 KiB
C
59 lines
2.3 KiB
C
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 5
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// RUN: %clang_cc1 -triple=x86_64 -emit-llvm -o - -std=c23 %s | FileCheck %s
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/* WG14 N2819: No
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* Disambiguate the storage class of some compound literals
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*/
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int *escaped;
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// CHECK-LABEL: define dso_local i32 @f(
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// CHECK-SAME: ptr noundef [[PTR:%.*]]) #[[ATTR0:[0-9]+]] {
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// CHECK-NEXT: [[ENTRY:.*:]]
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// CHECK-NEXT: [[PTR_ADDR:%.*]] = alloca ptr, align 8
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// CHECK-NEXT: store ptr [[PTR]], ptr [[PTR_ADDR]], align 8
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// CHECK-NEXT: [[TMP0:%.*]] = load ptr, ptr [[PTR_ADDR]], align 8
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// CHECK-NEXT: store ptr [[TMP0]], ptr @escaped, align 8
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// CHECK-NEXT: ret i32 1
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//
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int f(int *ptr) { escaped = ptr; return 1; }
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// CHECK-LABEL: define dso_local i32 @g(
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// CHECK-SAME: ptr noundef [[PARA:%.*]]) #[[ATTR0]] {
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// CHECK-NEXT: [[ENTRY:.*:]]
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// CHECK-NEXT: [[PARA_ADDR:%.*]] = alloca ptr, align 8
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// CHECK-NEXT: [[DOTCOMPOUNDLITERAL:%.*]] = alloca [27 x i32], align 4
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// CHECK-NEXT: store ptr [[PARA]], ptr [[PARA_ADDR]], align 8
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// CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4 [[DOTCOMPOUNDLITERAL]], i8 0, i64 108, i1 false)
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// CHECK-NEXT: [[ARRAYDECAY:%.*]] = getelementptr inbounds [27 x i32], ptr [[DOTCOMPOUNDLITERAL]], i64 0, i64 0
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// CHECK-NEXT: [[CALL:%.*]] = call i32 @f(ptr noundef [[ARRAYDECAY]])
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// CHECK-NEXT: [[TMP0:%.*]] = zext i32 [[CALL]] to i64
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// CHECK-NEXT: ret i32 0
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//
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int g(char *para [f(( int [27]) { 0 })]) {
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return 0;
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}
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// CHECK-LABEL: define dso_local i32 @main(
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// CHECK-SAME: ) #[[ATTR0]] {
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// CHECK-NEXT: [[ENTRY:.*:]]
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// CHECK-NEXT: [[RETVAL:%.*]] = alloca i32, align 4
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// CHECK-NEXT: store i32 0, ptr [[RETVAL]], align 4
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// CHECK-NEXT: [[CALL:%.*]] = call i32 @g(ptr noundef null)
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// CHECK-NEXT: [[TMP0:%.*]] = load ptr, ptr @escaped, align 8
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// CHECK-NEXT: store i32 12, ptr [[TMP0]], align 4
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// CHECK-NEXT: [[TMP1:%.*]] = load ptr, ptr @escaped, align 8
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// CHECK-NEXT: [[TMP2:%.*]] = load i32, ptr [[TMP1]], align 4
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// CHECK-NEXT: ret i32 [[TMP2]]
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//
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int main() {
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// Sets 'escaped' to the address of the array created by the compound literal.
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g(nullptr);
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// The lifetime of that object should have ended when g() returned, so this
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// should be a use-after-free.
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*escaped = 12;
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return *escaped;
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}
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