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All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Generate test of index and slice bounds checks. // The actual tests are index0.go, index1.go, index2.go. package main import ( "bufio" "fmt" "os" "unsafe" ) const prolog = ` package main import ( "runtime" ) type quad struct { x, y, z, w int } const ( cj = 100011 ci int = 100012 ci8 int8 = 115 ci16 int16 = 10016 ci32 int32 = 100013 ci64 int64 = 100014 ci64big int64 = 1<<31 ci64bigger int64 = 1<<32 chuge = 1<<100 cfgood = 2.0 cfbad = 2.1 cnj = -2 cni int = -3 cni8 int8 = -6 cni16 int16 = -7 cni32 int32 = -4 cni64 int64 = -5 cni64big int64 = -1<<31 cni64bigger int64 = -1<<32 cnhuge = -1<<100 cnfgood = -2.0 cnfbad = -2.1 ) var j int = 100020 var i int = 100021 var i8 int8 = 126 var i16 int16 = 10025 var i32 int32 = 100022 var i64 int64 = 100023 var i64big int64 = 1<<31 var i64bigger int64 = 1<<32 var huge uint64 = 1<<64 - 1 var fgood float64 = 2.0 var fbad float64 = 2.1 var nj int = -10 var ni int = -11 var ni8 int8 = -14 var ni16 int16 = -15 var ni32 int32 = -12 var ni64 int64 = -13 var ni64big int64 = -1<<31 var ni64bigger int64 = -1<<32 var nhuge int64 = -1<<63 var nfgood float64 = -2.0 var nfbad float64 = -2.1 var si []int = make([]int, 10) var ai [10]int var pai *[10]int = &ai var sq []quad = make([]quad, 10) var aq [10]quad var paq *[10]quad = &aq var sib []int = make([]int, 100000) var aib [100000]int var paib *[100000]int = &aib var sqb []quad = make([]quad, 100000) var aqb [100000]quad var paqb *[100000]quad = &aqb type T struct { si []int ai [10]int pai *[10]int sq []quad aq [10]quad paq *[10]quad sib []int aib [100000]int paib *[100000]int sqb []quad aqb [100000]quad paqb *[100000]quad } var t = T{si, ai, pai, sq, aq, paq, sib, aib, paib, sqb, aqb, paqb} var pt = &T{si, ai, pai, sq, aq, paq, sib, aib, paib, sqb, aqb, paqb} // test that f panics func test(f func(), s string) { defer func() { if err := recover(); err == nil { _, file, line, _ := runtime.Caller(2) bug() print(file, ":", line, ": ", s, " did not panic\n") } else if !contains(err.(error).Error(), "out of range") { _, file, line, _ := runtime.Caller(2) bug() print(file, ":", line, ": ", s, " unexpected panic: ", err.(error).Error(), "\n") } }() f() } func contains(x, y string) bool { for i := 0; i+len(y) <= len(x); i++ { if x[i:i+len(y)] == y { return true } } return false } var X interface{} func use(y interface{}) { X = y } var didBug = false func bug() { if !didBug { didBug = true println("BUG") } } func main() { ` // pass variable set in index[012].go // 0 - dynamic checks // 1 - static checks of invalid constants (cannot assign to types) // 2 - static checks of array bounds func testExpr(b *bufio.Writer, expr string) { if pass == 0 { fmt.Fprintf(b, "\ttest(func(){use(%s)}, %q)\n", expr, expr) } else { fmt.Fprintf(b, "\tuse(%s) // ERROR \"index|overflow|truncated|must be integer\"\n", expr) } } func main() { b := bufio.NewWriter(os.Stdout) if pass == 0 { fmt.Fprint(b, "// run\n\n") } else { fmt.Fprint(b, "// errorcheck\n\n") } fmt.Fprint(b, prolog) var choices = [][]string{ // Direct value, fetch from struct, fetch from struct pointer. // The last two cases get us to oindex_const_sudo in gsubr.c. []string{"", "t.", "pt."}, // Array, pointer to array, slice. []string{"a", "pa", "s"}, // Element is int, element is quad (struct). // This controls whether we end up in gsubr.c (i) or cgen.c (q). []string{"i", "q"}, // Small or big len. []string{"", "b"}, // Variable or constant. []string{"", "c"}, // Positive or negative. []string{"", "n"}, // Size of index. []string{"j", "i", "i8", "i16", "i32", "i64", "i64big", "i64bigger", "huge", "fgood", "fbad"}, } forall(choices, func(x []string) { p, a, e, big, c, n, i := x[0], x[1], x[2], x[3], x[4], x[5], x[6] // Pass: dynamic=0, static=1, 2. // Which cases should be caught statically? // Only constants, obviously. // Beyond that, must be one of these: // indexing into array or pointer to array // negative constant // large constant thisPass := 0 if c == "c" && (a == "a" || a == "pa" || n == "n" || i == "i64big" || i == "i64bigger" || i == "huge" || i == "fbad") { if i == "huge" { // Due to a detail of gc's internals, // the huge constant errors happen in an // earlier pass than the others and inhibits // the next pass from running. // So run it as a separate check. thisPass = 1 } else if a == "s" && n == "" && (i == "i64big" || i == "i64bigger") && unsafe.Sizeof(int(0)) > 4 { // If int is 64 bits, these huge // numbers do fit in an int, so they // are not rejected at compile time. thisPass = 0 } else { thisPass = 2 } } pae := p + a + e + big cni := c + n + i // If we're using the big-len data, positive int8 and int16 cannot overflow. if big == "b" && n == "" && (i == "i8" || i == "i16") { if pass == 0 { fmt.Fprintf(b, "\tuse(%s[%s])\n", pae, cni) fmt.Fprintf(b, "\tuse(%s[0:%s])\n", pae, cni) fmt.Fprintf(b, "\tuse(%s[1:%s])\n", pae, cni) fmt.Fprintf(b, "\tuse(%s[%s:])\n", pae, cni) fmt.Fprintf(b, "\tuse(%s[%s:%s])\n", pae, cni, cni) } return } // Float variables cannot be used as indices. if c == "" && (i == "fgood" || i == "fbad") { return } // Integral float constant is ok. if c == "c" && n == "" && i == "fgood" { if pass == 0 { fmt.Fprintf(b, "\tuse(%s[%s])\n", pae, cni) fmt.Fprintf(b, "\tuse(%s[0:%s])\n", pae, cni) fmt.Fprintf(b, "\tuse(%s[1:%s])\n", pae, cni) fmt.Fprintf(b, "\tuse(%s[%s:])\n", pae, cni) fmt.Fprintf(b, "\tuse(%s[%s:%s])\n", pae, cni, cni) } return } // Only print the test case if it is appropriate for this pass. if thisPass == pass { // Index operation testExpr(b, pae+"["+cni+"]") // Slice operation. // Low index 0 is a special case in ggen.c // so test both 0 and 1. testExpr(b, pae+"[0:"+cni+"]") testExpr(b, pae+"[1:"+cni+"]") testExpr(b, pae+"["+cni+":]") testExpr(b, pae+"["+cni+":"+cni+"]") } }) fmt.Fprintln(b, "}") b.Flush() } func forall(choices [][]string, f func([]string)) { x := make([]string, len(choices)) var recurse func(d int) recurse = func(d int) { if d >= len(choices) { f(x) return } for _, x[d] = range choices[d] { recurse(d + 1) } } recurse(0) }