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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-globals-avr.out.ll
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+28
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target datalayout = "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8:16-a:8"
target triple = "avr-unknown-unknown"
%entry = type { i8, ptr }
@table = global [4 x %entry] zeroinitializer
@runtime.gcGlobalRoots = internal constant [4 x { ptr, i16 }] [{ ptr, i16 } { ptr getelementptr (i8, ptr @table, i16 1), i16 2 }, { ptr, i16 } { ptr getelementptr (i8, ptr @table, i16 4), i16 2 }, { ptr, i16 } { ptr getelementptr (i8, ptr @table, i16 7), i16 2 }, { ptr, i16 } { ptr getelementptr (i8, ptr @table, i16 10), i16 2 }]
define i16 @runtime.gcGlobalRootCount() addrspace(1) {
entry:
ret i16 4
}
define ptr @runtime.gcGlobalRoot(i16 %0) addrspace(1) {
entry:
%1 = getelementptr inbounds [4 x { ptr, i16 }], ptr @runtime.gcGlobalRoots, i32 0, i16 %0
%2 = getelementptr inbounds nuw { ptr, i16 }, ptr %1, i32 0, i32 0
%3 = load ptr, ptr %2, align 1
ret ptr %3
}
define i16 @runtime.gcGlobalRootSize(i16 %0) addrspace(1) {
entry:
%1 = getelementptr inbounds [4 x { ptr, i16 }], ptr @runtime.gcGlobalRoots, i32 0, i16 %0
%2 = getelementptr inbounds nuw { ptr, i16 }, ptr %1, i32 0, i32 1
%3 = load i16, ptr %2, align 1
ret i16 %3
}