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interp: fix copy() from/to external buffers

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This includes copying from a //go:embed slice for example. The slice
with data is not available at interp time.

See: https://github.com/tinygo-org/tinygo/issues/4895
This commit is contained in:
Ayke van Laethem
2025-05-21 13:23:35 +02:00
committed by Ron Evans
parent 704489ed6d
commit cb5f7ad3fd
3 changed files with 42 additions and 1 deletions
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interp/testdata/slice-copy.out.ll
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+10
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@@ -3,6 +3,10 @@ target triple = "x86_64--linux"
@main.sliceSrcTaint.buf = internal global [2 x i8] c"cd"
@main.sliceDstTaint.buf = internal global [2 x i8] zeroinitializer
@main.sliceSrcExternal1.buf = external global [2 x i8]
@main.sliceDstExternal1.buf = internal global [2 x i8] zeroinitializer
@main.sliceSrcExternal2.buf = internal global [2 x i8] zeroinitializer
@main.sliceDstExternal2.buf = external global [2 x i8]
declare i64 @runtime.sliceCopy(ptr, ptr, i64, i64, i64) unnamed_addr
@@ -16,6 +20,8 @@ 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)
%copy.n5 = call i64 @runtime.sliceCopy(ptr @main.sliceDstExternal1.buf, ptr @main.sliceSrcExternal1.buf, i64 2, i64 2, i64 1)
%copy.n6 = call i64 @runtime.sliceCopy(ptr @main.sliceDstExternal2.buf, ptr @main.sliceSrcExternal2.buf, i64 2, i64 2, i64 1)
ret void
}
@@ -28,5 +34,9 @@ entry:
call void @runtime.printuint8(i8 97)
%sliceDstTaint.val = load i8, ptr @main.sliceDstTaint.buf, align 1
call void @runtime.printuint8(i8 %sliceDstTaint.val)
%sliceDstExternal1.val = load i8, ptr @main.sliceDstExternal1.buf, align 1
call void @runtime.printuint8(i8 %sliceDstExternal1.val)
%sliceDstExternal2.val = load i8, ptr @main.sliceDstExternal2.buf, align 1
call void @runtime.printuint8(i8 %sliceDstExternal2.val)
ret void
}