diff options
Diffstat (limited to 'src/runtime/mranges_test.go')
| -rw-r--r-- | src/runtime/mranges_test.go | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/src/runtime/mranges_test.go b/src/runtime/mranges_test.go new file mode 100644 index 0000000000..ed439c56c2 --- /dev/null +++ b/src/runtime/mranges_test.go @@ -0,0 +1,275 @@ +// Copyright 2020 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package runtime_test + +import ( + . "runtime" + "testing" +) + +func validateAddrRanges(t *testing.T, a *AddrRanges, want ...AddrRange) { + ranges := a.Ranges() + if len(ranges) != len(want) { + t.Errorf("want %v, got %v", want, ranges) + t.Fatal("different lengths") + } + gotTotalBytes := uintptr(0) + wantTotalBytes := uintptr(0) + for i := range ranges { + gotTotalBytes += ranges[i].Size() + wantTotalBytes += want[i].Size() + if ranges[i].Base() >= ranges[i].Limit() { + t.Error("empty range found") + } + // Ensure this is equivalent to what we want. + if !ranges[i].Equals(want[i]) { + t.Errorf("range %d: got [0x%x, 0x%x), want [0x%x, 0x%x)", i, + ranges[i].Base(), ranges[i].Limit(), + want[i].Base(), want[i].Limit(), + ) + } + if i != 0 { + // Ensure the ranges are sorted. + if ranges[i-1].Base() >= ranges[i].Base() { + t.Errorf("ranges %d and %d are out of sorted order", i-1, i) + } + // Check for a failure to coalesce. + if ranges[i-1].Limit() == ranges[i].Base() { + t.Errorf("ranges %d and %d should have coalesced", i-1, i) + } + // Check if any ranges overlap. Because the ranges are sorted + // by base, it's sufficient to just check neighbors. + if ranges[i-1].Limit() > ranges[i].Base() { + t.Errorf("ranges %d and %d overlap", i-1, i) + } + } + } + if wantTotalBytes != gotTotalBytes { + t.Errorf("expected %d total bytes, got %d", wantTotalBytes, gotTotalBytes) + } + if b := a.TotalBytes(); b != gotTotalBytes { + t.Errorf("inconsistent total bytes: want %d, got %d", gotTotalBytes, b) + } + if t.Failed() { + t.Errorf("addrRanges: %v", ranges) + t.Fatal("detected bad addrRanges") + } +} + +func TestAddrRangesAdd(t *testing.T) { + a := NewAddrRanges() + + // First range. + a.Add(MakeAddrRange(512, 1024)) + validateAddrRanges(t, &a, + MakeAddrRange(512, 1024), + ) + + // Coalesce up. + a.Add(MakeAddrRange(1024, 2048)) + validateAddrRanges(t, &a, + MakeAddrRange(512, 2048), + ) + + // Add new independent range. + a.Add(MakeAddrRange(4096, 8192)) + validateAddrRanges(t, &a, + MakeAddrRange(512, 2048), + MakeAddrRange(4096, 8192), + ) + + // Coalesce down. + a.Add(MakeAddrRange(3776, 4096)) + validateAddrRanges(t, &a, + MakeAddrRange(512, 2048), + MakeAddrRange(3776, 8192), + ) + + // Coalesce up and down. + a.Add(MakeAddrRange(2048, 3776)) + validateAddrRanges(t, &a, + MakeAddrRange(512, 8192), + ) + + // Push a bunch of independent ranges to the end to try and force growth. + expectedRanges := []AddrRange{MakeAddrRange(512, 8192)} + for i := uintptr(0); i < 64; i++ { + dRange := MakeAddrRange(8192+(i+1)*2048, 8192+(i+1)*2048+10) + a.Add(dRange) + expectedRanges = append(expectedRanges, dRange) + validateAddrRanges(t, &a, expectedRanges...) + } + + // Push a bunch of independent ranges to the beginning to try and force growth. + var bottomRanges []AddrRange + for i := uintptr(0); i < 63; i++ { + dRange := MakeAddrRange(8+i*8, 8+i*8+4) + a.Add(dRange) + bottomRanges = append(bottomRanges, dRange) + validateAddrRanges(t, &a, append(bottomRanges, expectedRanges...)...) + } +} + +func TestAddrRangesFindSucc(t *testing.T) { + var large []AddrRange + for i := 0; i < 100; i++ { + large = append(large, MakeAddrRange(5+uintptr(i)*5, 5+uintptr(i)*5+3)) + } + + type testt struct { + name string + base uintptr + expect int + ranges []AddrRange + } + tests := []testt{ + { + name: "Empty", + base: 12, + expect: 0, + ranges: []AddrRange{}, + }, + { + name: "OneBefore", + base: 12, + expect: 0, + ranges: []AddrRange{ + MakeAddrRange(14, 16), + }, + }, + { + name: "OneWithin", + base: 14, + expect: 1, + ranges: []AddrRange{ + MakeAddrRange(14, 16), + }, + }, + { + name: "OneAfterLimit", + base: 16, + expect: 1, + ranges: []AddrRange{ + MakeAddrRange(14, 16), + }, + }, + { + name: "OneAfter", + base: 17, + expect: 1, + ranges: []AddrRange{ + MakeAddrRange(14, 16), + }, + }, + { + name: "ThreeBefore", + base: 3, + expect: 0, + ranges: []AddrRange{ + MakeAddrRange(6, 10), + MakeAddrRange(12, 16), + MakeAddrRange(19, 22), + }, + }, + { + name: "ThreeAfter", + base: 24, + expect: 3, + ranges: []AddrRange{ + MakeAddrRange(6, 10), + MakeAddrRange(12, 16), + MakeAddrRange(19, 22), + }, + }, + { + name: "ThreeBetween", + base: 11, + expect: 1, + ranges: []AddrRange{ + MakeAddrRange(6, 10), + MakeAddrRange(12, 16), + MakeAddrRange(19, 22), + }, + }, + { + name: "ThreeWithin", + base: 9, + expect: 1, + ranges: []AddrRange{ + MakeAddrRange(6, 10), + MakeAddrRange(12, 16), + MakeAddrRange(19, 22), + }, + }, + { + name: "Zero", + base: 0, + expect: 1, + ranges: []AddrRange{ + MakeAddrRange(0, 10), + }, + }, + { + name: "Max", + base: ^uintptr(0), + expect: 1, + ranges: []AddrRange{ + MakeAddrRange(^uintptr(0)-5, ^uintptr(0)), + }, + }, + { + name: "LargeBefore", + base: 2, + expect: 0, + ranges: large, + }, + { + name: "LargeAfter", + base: 5 + uintptr(len(large))*5 + 30, + expect: len(large), + ranges: large, + }, + { + name: "LargeBetweenLow", + base: 14, + expect: 2, + ranges: large, + }, + { + name: "LargeBetweenHigh", + base: 249, + expect: 49, + ranges: large, + }, + { + name: "LargeWithinLow", + base: 25, + expect: 5, + ranges: large, + }, + { + name: "LargeWithinHigh", + base: 396, + expect: 79, + ranges: large, + }, + { + name: "LargeWithinMiddle", + base: 250, + expect: 50, + ranges: large, + }, + } + + for _, test := range tests { + t.Run(test.name, func(t *testing.T) { + a := MakeAddrRanges(test.ranges...) + i := a.FindSucc(test.base) + if i != test.expect { + t.Fatalf("expected %d, got %d", test.expect, i) + } + }) + } +} |