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interp: don't copy unknown values in runtime.sliceCopy

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This was bug https://github.com/tinygo-org/tinygo/issues/3890.
See the diff for details. Essentially, it means that `copy` in the
interpreter was copying data that wasn't known yet, or copying data into
a slice that could be read externally after the interp pass.
This commit is contained in:
Ayke van Laethem
2023-09-09 16:38:30 +02:00
committed by Ron Evans
parent e9d8a9bc0b
commit f11731ff35
3 changed files with 49 additions and 0 deletions
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interp/testdata/slice-copy.out.ll
Vendored
+12
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@@ -1,12 +1,21 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--linux"
@main.sliceSrcTaint.buf = internal global [2 x i8] c"cd"
@main.sliceDstTaint.buf = internal global [2 x i8] zeroinitializer
declare i64 @runtime.sliceCopy(ptr, ptr, i64, i64, i64) unnamed_addr
declare void @runtime.printuint8(i8) local_unnamed_addr
declare void @runtime.printint16(i16) local_unnamed_addr
declare void @use(ptr) local_unnamed_addr
define void @runtime.initAll() unnamed_addr {
entry:
call void @use(ptr @main.sliceSrcTaint.buf)
%copy.n4 = call i64 @runtime.sliceCopy(ptr @main.sliceDstTaint.buf, ptr @main.sliceSrcTaint.buf, i64 2, i64 2, i64 1)
ret void
}
@@ -16,5 +25,8 @@ entry:
call void @runtime.printuint8(i8 3)
call void @runtime.printint16(i16 5)
call void @runtime.printint16(i16 5)
call void @runtime.printuint8(i8 97)
%sliceDstTaint.val = load i8, ptr @main.sliceDstTaint.buf, align 1
call void @runtime.printuint8(i8 %sliceDstTaint.val)
ret void
}