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e819f7c9fe
Summary: This should be mostly NFC - we still lower the same alignment knowledge to the IR. The main reasoning here is that this somewhat improves readability of IR like this, and will improve test coverage in upcoming patch. Even though the alignment is guaranteed to always be an I-C-E, we don't always materialize it as llvm's Alignment Attribute because: 1. There may be a non-zero offset 2. We may be sanitizing for alignment Note that if there already was an IR alignment attribute on return value, we union them, and thus the alignment only ever rises. Also, there is a second relevant clang attribute `AllocAlignAttr`, so that is why `AbstractAssumeAlignedAttrEmitter` is templated. Reviewers: erichkeane, jdoerfert, hfinkel, aaron.ballman, rsmith Reviewed By: erichkeane Subscribers: cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D73005
45 lines
3.7 KiB
C++
45 lines
3.7 KiB
C++
// RUN: %clang_cc1 -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s --check-prefixes=CHECK,CHECK-NOSANITIZE
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// RUN: %clang_cc1 -fsanitize=alignment -fno-sanitize-recover=alignment -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s -implicit-check-not="call void @__ubsan_handle_alignment_assumption" --check-prefixes=CHECK,CHECK-SANITIZE,CHECK-SANITIZE-ANYRECOVER,CHECK-SANITIZE-NORECOVER,CHECK-SANITIZE-UNREACHABLE
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// RUN: %clang_cc1 -fsanitize=alignment -fsanitize-recover=alignment -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s -implicit-check-not="call void @__ubsan_handle_alignment_assumption" --check-prefixes=CHECK,CHECK-SANITIZE,CHECK-SANITIZE-ANYRECOVER,CHECK-SANITIZE-RECOVER
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// RUN: %clang_cc1 -fsanitize=alignment -fsanitize-trap=alignment -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s -implicit-check-not="call void @__ubsan_handle_alignment_assumption" --check-prefixes=CHECK,CHECK-SANITIZE,CHECK-SANITIZE-TRAP,CHECK-SANITIZE-UNREACHABLE
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// CHECK-SANITIZE-ANYRECOVER: @[[CHAR:.*]] = {{.*}} c"'char **'\00" }
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// CHECK-SANITIZE-ANYRECOVER: @[[LINE_100_ALIGNMENT_ASSUMPTION:.*]] = {{.*}}, i32 100, i32 10 }, {{.*}}* @[[CHAR]] }
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char **__attribute__((assume_aligned(128))) passthrough(char **x) {
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// CHECK: define i8** @[[PASSTHROUGH:.*]](i8** %[[X:.*]])
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// CHECK-NEXT: entry:
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// CHECK-NEXT: %[[X_ADDR:.*]] = alloca i8**, align 8
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// CHECK-NEXT: store i8** %[[X]], i8*** %[[X_ADDR]], align 8
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// CHECK-NEXT: %[[X_RELOADED:.*]] = load i8**, i8*** %[[X_ADDR]], align 8
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// CHECK-NEXT: ret i8** %[[X_RELOADED]]
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// CHECK-NEXT: }
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return x;
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}
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char **caller(char **x) {
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// CHECK: define i8** @{{.*}}(i8** %[[X]])
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// CHECK-NEXT: entry:
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// CHECK-NEXT: %[[X_ADDR]] = alloca i8**, align 8
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// CHECK-NEXT: store i8** %[[X]], i8*** %[[X_ADDR]], align 8
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// CHECK-NEXT: %[[X_RELOADED:.*]] = load i8**, i8*** %[[X_ADDR]], align 8
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// CHECK-NOSANITIZE-NEXT: %[[X_RETURNED:.*]] = call align 128 i8** @[[PASSTHROUGH]](i8** %[[X_RELOADED]])
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// CHECK-SANITIZE-NEXT: %[[X_RETURNED:.*]] = call i8** @[[PASSTHROUGH]](i8** %[[X_RELOADED]])
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// CHECK-SANITIZE-NEXT: %[[PTRINT:.*]] = ptrtoint i8** %[[X_RETURNED]] to i64
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// CHECK-SANITIZE-NEXT: %[[MASKEDPTR:.*]] = and i64 %[[PTRINT]], 127
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// CHECK-SANITIZE-NEXT: %[[MASKCOND:.*]] = icmp eq i64 %[[MASKEDPTR]], 0
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// CHECK-SANITIZE-NEXT: %[[PTRINT_DUP:.*]] = ptrtoint i8** %[[X_RETURNED]] to i64, !nosanitize
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// CHECK-SANITIZE-NEXT: br i1 %[[MASKCOND]], label %[[CONT:.*]], label %[[HANDLER_ALIGNMENT_ASSUMPTION:[^,]+]],{{.*}} !nosanitize
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// CHECK-SANITIZE: [[HANDLER_ALIGNMENT_ASSUMPTION]]:
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// CHECK-SANITIZE-NORECOVER-NEXT: call void @__ubsan_handle_alignment_assumption_abort(i8* bitcast ({ {{{.*}}}, {{{.*}}}, {{{.*}}}* }* @[[LINE_100_ALIGNMENT_ASSUMPTION]] to i8*), i64 %[[PTRINT_DUP]], i64 128, i64 0){{.*}}, !nosanitize
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// CHECK-SANITIZE-RECOVER-NEXT: call void @__ubsan_handle_alignment_assumption(i8* bitcast ({ {{{.*}}}, {{{.*}}}, {{{.*}}}* }* @[[LINE_100_ALIGNMENT_ASSUMPTION]] to i8*), i64 %[[PTRINT_DUP]], i64 128, i64 0){{.*}}, !nosanitize
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// CHECK-SANITIZE-TRAP-NEXT: call void @llvm.trap(){{.*}}, !nosanitize
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// CHECK-SANITIZE-UNREACHABLE-NEXT: unreachable, !nosanitize
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// CHECK-SANITIZE: [[CONT]]:
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// CHECK-SANITIZE-NEXT: call void @llvm.assume(i1 %[[MASKCOND]])
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// CHECK-NEXT: ret i8** %[[X_RETURNED]]
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// CHECK-NEXT: }
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#line 100
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return passthrough(x);
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}
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