https://github.com/ojhunt closed
https://github.com/llvm/llvm-project/pull/139790
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@@ -3074,6 +3074,39 @@ following way:
Query for this feature with ``__has_builtin(__builtin_offsetof)``.
+``__builtin_get_vtable_pointer``
+
+
+``__builtin_get_vtable_pointer`` loads and authenticates the primary vtable
+pointer from an instanc
https://github.com/ojhunt updated
https://github.com/llvm/llvm-project/pull/139790
>From a933679801bde89b53584c4c65118658477db4da Mon Sep 17 00:00:00 2001
From: Oliver Hunt
Date: Tue, 13 May 2025 13:35:55 -0700
Subject: [PATCH 1/5] [clang][PAC] Add __builtin_get_vtable_pointer
With pointer aut
@@ -1825,6 +1825,37 @@ static ExprResult PointerAuthStringDiscriminator(Sema
&S, CallExpr *Call) {
return Call;
}
+static ExprResult GetVTablePointer(Sema &S, CallExpr *Call) {
+ if (S.checkArgCount(Call, 1))
+return ExprError();
+ ExprResult ThisArg = S.DefaultFuncti
@@ -3074,6 +3074,39 @@ following way:
Query for this feature with ``__has_builtin(__builtin_offsetof)``.
+``__builtin_get_vtable_pointer``
+
+
+``__builtin_get_vtable_pointer`` loads and authenticates the primary vtable
+pointer from an instanc
https://github.com/cor3ntin approved this pull request.
LGTM
https://github.com/llvm/llvm-project/pull/139790
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https://github.com/cor3ntin edited
https://github.com/llvm/llvm-project/pull/139790
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@@ -3074,6 +3074,39 @@ following way:
Query for this feature with ``__has_builtin(__builtin_offsetof)``.
+``__builtin_get_vtable_pointer``
+
+
+``__builtin_get_vtable_pointer`` loads and authenticates the primary vtable
+pointer from an instanc
https://github.com/ojhunt updated
https://github.com/llvm/llvm-project/pull/139790
>From a933679801bde89b53584c4c65118658477db4da Mon Sep 17 00:00:00 2001
From: Oliver Hunt
Date: Tue, 13 May 2025 13:35:55 -0700
Subject: [PATCH 1/2] [clang][PAC] Add __builtin_get_vtable_pointer
With pointer aut
https://github.com/ojhunt updated
https://github.com/llvm/llvm-project/pull/139790
>From a933679801bde89b53584c4c65118658477db4da Mon Sep 17 00:00:00 2001
From: Oliver Hunt
Date: Tue, 13 May 2025 13:35:55 -0700
Subject: [PATCH 1/3] [clang][PAC] Add __builtin_get_vtable_pointer
With pointer aut
@@ -1825,6 +1825,37 @@ static ExprResult PointerAuthStringDiscriminator(Sema
&S, CallExpr *Call) {
return Call;
}
+static ExprResult GetVTablePointer(Sema &S, CallExpr *Call) {
+ if (S.checkArgCount(Call, 1))
+return ExprError();
+ ExprResult ThisArg = S.DefaultFuncti
https://github.com/asl milestoned
https://github.com/llvm/llvm-project/pull/139790
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@@ -1825,6 +1825,37 @@ static ExprResult PointerAuthStringDiscriminator(Sema
&S, CallExpr *Call) {
return Call;
}
+static ExprResult GetVTablePointer(Sema &S, CallExpr *Call) {
+ if (S.checkArgCount(Call, 1))
+return ExprError();
+ ExprResult ThisArg = S.DefaultFuncti
@@ -1825,6 +1825,37 @@ static ExprResult PointerAuthStringDiscriminator(Sema
&S, CallExpr *Call) {
return Call;
}
+static ExprResult GetVTablePointer(Sema &S, CallExpr *Call) {
+ if (S.checkArgCount(Call, 1))
+return ExprError();
+ ExprResult ThisArg = S.DefaultFuncti
@@ -1825,6 +1825,37 @@ static ExprResult PointerAuthStringDiscriminator(Sema
&S, CallExpr *Call) {
return Call;
}
+static ExprResult GetVTablePointer(Sema &S, CallExpr *Call) {
+ if (S.checkArgCount(Call, 1))
+return ExprError();
+ ExprResult ThisArg = S.DefaultFuncti
@@ -1825,6 +1825,37 @@ static ExprResult PointerAuthStringDiscriminator(Sema
&S, CallExpr *Call) {
return Call;
}
+static ExprResult GetVTablePointer(Sema &S, CallExpr *Call) {
+ if (S.checkArgCount(Call, 1))
+return ExprError();
+ ExprResult ThisArg = S.DefaultFuncti
https://github.com/cor3ntin edited
https://github.com/llvm/llvm-project/pull/139790
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https://github.com/cor3ntin commented:
Can you add tests for const types, and tests that check
`__is_same_as(decltype(__builtin_get_vtable_pointer(foo)), const void*)` ?
LGTM otherwise
https://github.com/llvm/llvm-project/pull/139790
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@@ -1825,6 +1825,37 @@ static ExprResult PointerAuthStringDiscriminator(Sema
&S, CallExpr *Call) {
return Call;
}
+static ExprResult GetVTablePointer(Sema &S, CallExpr *Call) {
+ if (S.checkArgCount(Call, 1))
+return ExprError();
+ ExprResult ThisArg = S.DefaultFuncti
@@ -1825,6 +1825,37 @@ static ExprResult PointerAuthStringDiscriminator(Sema
&S, CallExpr *Call) {
return Call;
}
+static ExprResult GetVTablePointer(Sema &S, CallExpr *Call) {
+ if (S.checkArgCount(Call, 1))
+return ExprError();
+ ExprResult ThisArg = S.DefaultFuncti
https://github.com/ojhunt updated
https://github.com/llvm/llvm-project/pull/139790
>From a933679801bde89b53584c4c65118658477db4da Mon Sep 17 00:00:00 2001
From: Oliver Hunt
Date: Tue, 13 May 2025 13:35:55 -0700
Subject: [PATCH] [clang][PAC] Add __builtin_get_vtable_pointer
With pointer authent
github-actions[bot] wrote:
:warning: C/C++ code formatter, clang-format found issues in your code.
:warning:
You can test this locally with the following command:
``bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp --
clang/test/CodeGenCXX/builtin-get-vtable-pointer.cpp
llvmbot wrote:
@llvm/pr-subscribers-clang-codegen
Author: Oliver Hunt (ojhunt)
Changes
With pointer authentication it becomes non-trivial to correctly load the vtable
pointer of a polymorphic object.
__builtin_get_vtable_pointer is a function that performs the load and performs
the appr
https://github.com/ojhunt created
https://github.com/llvm/llvm-project/pull/139790
With pointer authentication it becomes non-trivial to correctly load the vtable
pointer of a polymorphic object.
__builtin_get_vtable_pointer is a function that performs the load and performs
the appropriate au
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