forked from OSchip/llvm-project
73 lines
2.2 KiB
Go
73 lines
2.2 KiB
Go
//===- errors.go - IR generation for run-time panics ----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements IR generation for triggering run-time panics.
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//
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//===----------------------------------------------------------------------===//
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package irgen
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import (
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"llvm.org/llvm/bindings/go/llvm"
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)
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const (
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// From go-runtime-error.c
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gccgoRuntimeErrorSLICE_INDEX_OUT_OF_BOUNDS = 0
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gccgoRuntimeErrorARRAY_INDEX_OUT_OF_BOUNDS = 1
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gccgoRuntimeErrorSTRING_INDEX_OUT_OF_BOUNDS = 2
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gccgoRuntimeErrorSLICE_SLICE_OUT_OF_BOUNDS = 3
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gccgoRuntimeErrorARRAY_SLICE_OUT_OF_BOUNDS = 4
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gccgoRuntimeErrorSTRING_SLICE_OUT_OF_BOUNDS = 5
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gccgoRuntimeErrorNIL_DEREFERENCE = 6
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gccgoRuntimeErrorMAKE_SLICE_OUT_OF_BOUNDS = 7
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gccgoRuntimeErrorMAKE_MAP_OUT_OF_BOUNDS = 8
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gccgoRuntimeErrorMAKE_CHAN_OUT_OF_BOUNDS = 9
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gccgoRuntimeErrorDIVISION_BY_ZERO = 10
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gccgoRuntimeErrorCount = 11
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)
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func (fr *frame) setBranchWeightMetadata(br llvm.Value, trueweight, falseweight uint64) {
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mdprof := llvm.MDKindID("prof")
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mdnode := llvm.GlobalContext().MDNode([]llvm.Metadata{
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llvm.GlobalContext().MDString("branch_weights"),
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llvm.ConstInt(llvm.Int32Type(), trueweight, false).ConstantAsMetadata(),
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llvm.ConstInt(llvm.Int32Type(), falseweight, false).ConstantAsMetadata(),
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})
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br.SetMetadata(mdprof, mdnode)
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}
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func (fr *frame) condBrRuntimeError(cond llvm.Value, errcode uint64) {
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if cond.IsNull() {
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return
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}
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errorbb := fr.runtimeErrorBlocks[errcode]
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newbb := errorbb.C == nil
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if newbb {
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errorbb = llvm.AddBasicBlock(fr.function, "")
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fr.runtimeErrorBlocks[errcode] = errorbb
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}
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contbb := llvm.AddBasicBlock(fr.function, "")
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br := fr.builder.CreateCondBr(cond, errorbb, contbb)
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fr.setBranchWeightMetadata(br, 1, 1000)
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if newbb {
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fr.builder.SetInsertPointAtEnd(errorbb)
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fr.runtime.runtimeError.call(fr, llvm.ConstInt(llvm.Int32Type(), errcode, false))
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fr.builder.CreateUnreachable()
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}
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fr.builder.SetInsertPointAtEnd(contbb)
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}
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