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cmd/compile: make argument length mismatch in mkcall an error

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mkcall is used to construct calls to builtin functions.

Instead of silently ignoring any additional arguments to mkcall
abort compilation with an error.

This protects against accidentally supplying too many arguments to mkcall
when compiler changes are made.

Change appendslice and copyany to construct calls to
slicestringcopy and slicecopy explicitly instead of
relying on the old behavior as a feature.

Change-Id: I3cfe815a57d454a129e3c08aac824f6107779a42
Reviewed-on: https://go-review.googlesource.com/57770
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Martin Möhrmann 2017-08-18 18:40:12 +02:00
parent cbc4e5d9c4
commit 8bbae3d5c9
1 changed files with 21 additions and 13 deletions
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34
src/cmd/compile/internal/gc/walk.go
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@ -2779,9 +2779,12 @@ func vmkcall(fn *Node, t *types.Type, init *Nodes, va []*Node) *Node {
}
n := fn.Type.Params().NumFields()
if n != len(va) {
Fatalf("vmkcall %v needs %v args got %v", fn, n, len(va))
}
r := nod(OCALL, fn, nil)
r.List.Set(va[:n])
r.List.Set(va)
if fn.Type.Results().NumFields() > 0 {
r = typecheck(r, Erv|Efnstruct)
} else {
@ -3036,16 +3039,20 @@ func appendslice(n *Node, init *Nodes) *Node {
nptr1.SetSliceBounds(nod(OLEN, l1, nil), nil, nil)
nptr1.Etype = 1
nptr2 := l2
var fn *Node
if l2.Type.IsString() {
fn = syslook("slicestringcopy")
} else {
fn = syslook("slicecopy")
}
fn = substArgTypes(fn, l1.Type, l2.Type)
var ln Nodes
ln.Set(l)
nt := mkcall1(fn, types.Types[TINT], &ln, nptr1, nptr2, nodintconst(s.Type.Elem().Width))
var nt *Node
if l2.Type.IsString() {
fn := syslook("slicestringcopy")
fn = substArgTypes(fn, l1.Type, l2.Type)
nt = mkcall1(fn, types.Types[TINT], &ln, nptr1, nptr2)
} else {
fn := syslook("slicecopy")
fn = substArgTypes(fn, l1.Type, l2.Type)
nt = mkcall1(fn, types.Types[TINT], &ln, nptr1, nptr2, nodintconst(s.Type.Elem().Width))
}
l = append(ln.Slice(), nt)
} else {
// memmove(&s[len(l1)], &l2[0], len(l2)*sizeof(T))
@ -3186,12 +3193,13 @@ func copyany(n *Node, init *Nodes, runtimecall bool) *Node {
}
if runtimecall {
var fn *Node
if n.Right.Type.IsString() {
fn = syslook("slicestringcopy")
} else {
fn = syslook("slicecopy")
fn := syslook("slicestringcopy")
fn = substArgTypes(fn, n.Left.Type, n.Right.Type)
return mkcall1(fn, n.Type, init, n.Left, n.Right)
}
fn := syslook("slicecopy")
fn = substArgTypes(fn, n.Left.Type, n.Right.Type)
return mkcall1(fn, n.Type, init, n.Left, n.Right, nodintconst(n.Left.Type.Elem().Width))
}