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runtime: require explicit GC layouts

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This commit is contained in:
Jake Bailey
2026-08-07 10:21:19 -07:00
committed by Ron Evans
parent 1a4cb2032e
commit a7360d5ad3
28 changed files with 279 additions and 108 deletions
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transform/testdata/gc-stackslots.ll
Vendored
+8 -8
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@@ -18,7 +18,7 @@ define ptr @getPointer() {
define ptr @needsStackSlots() {
; Tracked pointer. Although, in this case the value is immediately returned
; so tracking it is not really necessary.
%ptr = call ptr @runtime.alloc(i32 4, ptr null)
%ptr = call ptr @runtime.alloc(i32 4, ptr inttoptr (i32 3 to ptr))
call void @runtime.trackPointer(ptr %ptr)
call void @someArbitraryFunction()
%val = load i8, ptr @someGlobal
@@ -39,7 +39,7 @@ define ptr @needsStackSlots2() {
call void @runtime.trackPointer(ptr %ptr2)
; Here is finally the point where an allocation happens.
%unused = call ptr @runtime.alloc(i32 4, ptr null)
%unused = call ptr @runtime.alloc(i32 4, ptr inttoptr (i32 3 to ptr))
call void @runtime.trackPointer(ptr %unused)
ret ptr %ptr1
@@ -57,7 +57,7 @@ define ptr @fibNext(ptr %x, ptr %y) {
%x.val = load i8, ptr %x
%y.val = load i8, ptr %y
%out.val = add i8 %x.val, %y.val
%out.alloc = call ptr @runtime.alloc(i32 1, ptr null)
%out.alloc = call ptr @runtime.alloc(i32 1, ptr inttoptr (i32 3 to ptr))
call void @runtime.trackPointer(ptr %out.alloc)
store i8 %out.val, ptr %out.alloc
ret ptr %out.alloc
@@ -65,9 +65,9 @@ define ptr @fibNext(ptr %x, ptr %y) {
define ptr @allocLoop() {
entry:
%entry.x = call ptr @runtime.alloc(i32 1, ptr null)
%entry.x = call ptr @runtime.alloc(i32 1, ptr inttoptr (i32 3 to ptr))
call void @runtime.trackPointer(ptr %entry.x)
%entry.y = call ptr @runtime.alloc(i32 1, ptr null)
%entry.y = call ptr @runtime.alloc(i32 1, ptr inttoptr (i32 3 to ptr))
call void @runtime.trackPointer(ptr %entry.y)
store i8 1, ptr %entry.y
br label %loop
@@ -93,7 +93,7 @@ define void @testGEPBitcast() {
%arr = call ptr @arrayAlloc()
%arr.bitcast = getelementptr [32 x i8], ptr %arr, i32 0, i32 0
call void @runtime.trackPointer(ptr %arr.bitcast)
%other = call ptr @runtime.alloc(i32 1, ptr null)
%other = call ptr @runtime.alloc(i32 1, ptr inttoptr (i32 3 to ptr))
call void @runtime.trackPointer(ptr %other)
ret void
}
@@ -103,7 +103,7 @@ define void @someArbitraryFunction() {
}
define void @earlyPopRegression() {
%x.alloc = call ptr @runtime.alloc(i32 4, ptr null)
%x.alloc = call ptr @runtime.alloc(i32 4, ptr inttoptr (i32 3 to ptr))
call void @runtime.trackPointer(ptr %x.alloc)
; At this point the pass used to pop the stack chain, resulting in a potential use-after-free during allocAndSave.
musttail call void @allocAndSave(ptr %x.alloc)
@@ -111,7 +111,7 @@ define void @earlyPopRegression() {
}
define void @allocAndSave(ptr %x) {
%y = call ptr @runtime.alloc(i32 4, ptr null)
%y = call ptr @runtime.alloc(i32 4, ptr inttoptr (i32 3 to ptr))
call void @runtime.trackPointer(ptr %y)
store ptr %y, ptr %x
store ptr %x, ptr @ptrGlobal