This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG88f7f018e23b: [-Wunsafe-buffer-usage] Match unsafe pointers
being casted to bool or… (authored by ziqingluo-90).
Changed prior to commit:
https://reviews.llvm.org/D144064?vs=506733&id=512600#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D144064/new/
https://reviews.llvm.org/D144064
Files:
clang/lib/Analysis/UnsafeBufferUsage.cpp
clang/test/SemaCXX/warn-unsafe-buffer-usage-fixits-addressof-arraysubscript.cpp
Index: clang/test/SemaCXX/warn-unsafe-buffer-usage-fixits-addressof-arraysubscript.cpp
===================================================================
--- clang/test/SemaCXX/warn-unsafe-buffer-usage-fixits-addressof-arraysubscript.cpp
+++ clang/test/SemaCXX/warn-unsafe-buffer-usage-fixits-addressof-arraysubscript.cpp
@@ -13,12 +13,30 @@
// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:37-[[@LINE-1]]:42}:"&p.data()[x]"
}
+void address_to_bool(int x) {
+ int * p = new int[10];
+ bool a = (bool) &p[5];
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:19-[[@LINE-1]]:24}:"&p.data()[5]"
+ bool b = (bool) &p[x];
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:19-[[@LINE-1]]:24}:"&p.data()[x]"
+
+ bool a1 = &p[5];
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:13-[[@LINE-1]]:18}:"&p.data()[5]"
+ bool b1 = &p[x];
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:13-[[@LINE-1]]:18}:"&p.data()[x]"
+
+ if (&p[5]) {
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:7-[[@LINE-1]]:12}:"&p.data()[5]"
+ return;
+ }
+}
+
void call_argument(int x) {
int * p = new int[10];
f((unsigned long) &p[5], &p[x]);
- // CHECK-DAG: fix-it:"{{.*}}":{[[@LINE-1]]:21-[[@LINE-1]]:26}:"&p.data()[5]"
- // CHECK-DAG: fix-it:"{{.*}}":{[[@LINE-2]]:28-[[@LINE-2]]:33}:"&p.data()[x]"
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:21-[[@LINE-1]]:26}:"&p.data()[5]"
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:28-[[@LINE-2]]:33}:"&p.data()[x]"
}
void ignore_unsafe_calls(int x) {
@@ -55,9 +73,26 @@
// CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:5-[[@LINE-1]]:10}:"p.data()"
}
-// CHECK-NOT: fix-it
+void pointer_subtraction(int x) {
+ int * p = new int[10];
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:3-[[@LINE-1]]:12}:"std::span<int> p"
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:13-[[@LINE-2]]:13}:"{"
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:24-[[@LINE-3]]:24}:", 10}"
+
+ int n = &p[9] - &p[4];
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:11-[[@LINE-1]]:16}:"&p.data()[9]"
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:19-[[@LINE-2]]:24}:"&p.data()[4]"
+ if (&p[9] - &p[x]) {
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:7-[[@LINE-1]]:12}:"&p.data()[9]"
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:15-[[@LINE-2]]:20}:"&p.data()[x]"
+ return;
+ }
+}
+
// To test multiple function declarations, each of which carries
-// different incomplete informations:
+// different incomplete informations.
+// no fix-it in the rest of this test:
+
[[clang::unsafe_buffer_usage]]
void unsafe_g(void*);
@@ -65,8 +100,9 @@
void multiple_unsafe_fundecls() {
int * p = new int[10];
-
+ // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-1]]
unsafe_g(&p[5]);
+ // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-1]]
}
void unsafe_h(void*);
@@ -78,6 +114,7 @@
void multiple_unsafe_fundecls2() {
int * p = new int[10];
-
+ // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-1]]
unsafe_h(&p[5]);
+ // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-1]]
}
Index: clang/lib/Analysis/UnsafeBufferUsage.cpp
===================================================================
--- clang/lib/Analysis/UnsafeBufferUsage.cpp
+++ clang/lib/Analysis/UnsafeBufferUsage.cpp
@@ -163,24 +163,40 @@
isInUnspecifiedPointerContext(internal::Matcher<Stmt> InnerMatcher) {
// A UPC can be
// 1. an argument of a function call (except the callee has [[unsafe_...]]
- // attribute), or
- // 2. the operand of a cast operation; or
+ // attribute), or
+ // 2. the operand of a pointer-to-(integer or bool) cast operation; or
// 3. the operand of a comparator operation; or
+ // 4. the operand of a pointer subtraction operation
+ // (i.e., computing the distance between two pointers); or ...
+
auto CallArgMatcher =
callExpr(forEachArgumentWithParam(InnerMatcher,
hasPointerType() /* array also decays to pointer type*/),
unless(callee(functionDecl(hasAttr(attr::UnsafeBufferUsage)))));
auto CastOperandMatcher =
- explicitCastExpr(hasCastKind(CastKind::CK_PointerToIntegral),
- castSubExpr(allOf(hasPointerType(), InnerMatcher)));
+ castExpr(anyOf(hasCastKind(CastKind::CK_PointerToIntegral),
+ hasCastKind(CastKind::CK_PointerToBoolean)),
+ castSubExpr(allOf(hasPointerType(), InnerMatcher)));
auto CompOperandMatcher =
binaryOperator(hasAnyOperatorName("!=", "==", "<", "<=", ">", ">="),
eachOf(hasLHS(allOf(hasPointerType(), InnerMatcher)),
hasRHS(allOf(hasPointerType(), InnerMatcher))));
- return stmt(anyOf(CallArgMatcher, CastOperandMatcher, CompOperandMatcher));
+ // A matcher that matches pointer subtractions:
+ auto PtrSubtractionMatcher =
+ binaryOperator(hasOperatorName("-"),
+ // Note that here we need both LHS and RHS to be
+ // pointer. Then the inner matcher can match any of
+ // them:
+ allOf(hasLHS(hasPointerType()),
+ hasRHS(hasPointerType())),
+ eachOf(hasLHS(InnerMatcher),
+ hasRHS(InnerMatcher)));
+
+ return stmt(anyOf(CallArgMatcher, CastOperandMatcher, CompOperandMatcher,
+ PtrSubtractionMatcher));
// FIXME: any more cases? (UPC excludes the RHS of an assignment. For now we
// don't have to check that.)
}
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