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runtime: precisely scan Wasm globals

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This commit is contained in:
Jake Bailey
2026-08-07 10:32:00 -07:00
committed by Ron Evans
parent a7360d5ad3
commit 829fe514cc
11 changed files with 345 additions and 5 deletions
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transform/testdata/gc-stackslots.out.ll
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+31
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@@ -5,11 +5,42 @@ target triple = "wasm32-unknown-unknown-wasm"
@someGlobal = global i8 3
@ptrGlobal = global ptr null
@arrGlobal = global [8 x i8] zeroinitializer
@structGlobal = global { ptr, i32, [2 x ptr] } zeroinitializer
@ptrArrayGlobal = global [8 x ptr] zeroinitializer
@constantPtrGlobal = constant ptr @someGlobal
@runtime.gcGlobalRoots = internal constant [4 x { ptr, i32 }] [{ ptr, i32 } { ptr @ptrGlobal, i32 4 }, { ptr, i32 } { ptr @structGlobal, i32 4 }, { ptr, i32 } { ptr getelementptr (i8, ptr @structGlobal, i32 8), i32 8 }, { ptr, i32 } { ptr @ptrArrayGlobal, i32 32 }]
@runtime.gcGlobalRootValueArray = internal global [12 x i32] zeroinitializer
declare void @runtime.trackPointer(ptr nocapture readonly)
declare noalias nonnull ptr @runtime.alloc(i32, ptr)
define i32 @runtime.gcGlobalRootCount() {
entry:
ret i32 4
}
define ptr @runtime.gcGlobalRoot(i32 %0) {
entry:
%1 = getelementptr inbounds [4 x { ptr, i32 }], ptr @runtime.gcGlobalRoots, i32 0, i32 %0
%2 = getelementptr inbounds nuw { ptr, i32 }, ptr %1, i32 0, i32 0
%3 = load ptr, ptr %2, align 4
ret ptr %3
}
define i32 @runtime.gcGlobalRootSize(i32 %0) {
entry:
%1 = getelementptr inbounds [4 x { ptr, i32 }], ptr @runtime.gcGlobalRoots, i32 0, i32 %0
%2 = getelementptr inbounds nuw { ptr, i32 }, ptr %1, i32 0, i32 1
%3 = load i32, ptr %2, align 4
ret i32 %3
}
define ptr @runtime.gcGlobalRootValues() {
entry:
ret ptr @runtime.gcGlobalRootValueArray
}
define ptr @getPointer() {
ret ptr @someGlobal
}