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compiler: Workaround for runtime.boundsCheck in runtime dependencies

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This commit is contained in:
Ayke van Laethem
2018-05-05 19:18:53 +02:00
parent 01602309fd
commit 16489c0df6
1 changed files with 10 additions and 5 deletions
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tgo.go
+10 -5
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@@ -843,11 +843,16 @@ func (c *Compiler) parseExpr(frame *Frame, expr ssa.Value) (llvm.Value, error) {
// Bounds check.
// LLVM optimizes this away in most cases.
constZero := llvm.ConstInt(c.intType, 0, false)
isNegative := c.builder.CreateICmp(llvm.IntSLT, index, constZero, "") // index < 0
isTooBig := c.builder.CreateICmp(llvm.IntSGE, index, buflen, "") // index >= len(value)
isOverflow := c.builder.CreateOr(isNegative, isTooBig, "")
c.builder.CreateCall(c.mod.NamedFunction("runtime.boundsCheck"), []llvm.Value{isOverflow}, "")
// TODO: runtime.boundsCheck is undefined in packages imported by
// package runtime, so we have to remove it. This should be fixed.
boundsCheck := c.mod.NamedFunction("runtime.boundsCheck")
if !boundsCheck.IsNil() {
constZero := llvm.ConstInt(c.intType, 0, false)
isNegative := c.builder.CreateICmp(llvm.IntSLT, index, constZero, "") // index < 0
isTooBig := c.builder.CreateICmp(llvm.IntSGE, index, buflen, "") // index >= len(value)
isOverflow := c.builder.CreateOr(isNegative, isTooBig, "")
c.builder.CreateCall(boundsCheck, []llvm.Value{isOverflow}, "")
}
indices := []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), 0, false),