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| author | Keith Randall <khr@google.com> | 2018-11-12 15:49:09 -0800 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2018-11-13 22:52:09 +0000 |
| commit | 0098f8aeaceb5feec7462ae64f8ce91a473360c1 (patch) | |
| tree | 3727380bc1f037536a6cc9933e2a0b3bd183cab3 /src/runtime/stack.go | |
| parent | df2bb9817b2184256886d9d9458753b2273c202d (diff) | |
| download | go-0098f8aeaceb5feec7462ae64f8ce91a473360c1.tar.xz | |
runtime: when using explicit argmap, also use arglen
When we set an explicit argmap, we may want only a prefix of that
argmap. Argmap is set when the function is reflect.makeFuncStub or
reflect.methodValueCall. In this case, arglen specifies how much of
the args section is actually live. (It could be either all the args +
results, or just the args.)
Fixes #28750
Change-Id: Idf060607f15a298ac591016994e58e22f7f92d83
Reviewed-on: https://go-review.googlesource.com/c/149217
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Diffstat (limited to 'src/runtime/stack.go')
| -rw-r--r-- | src/runtime/stack.go | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/runtime/stack.go b/src/runtime/stack.go index 65aa7dbd59..85902a6b68 100644 --- a/src/runtime/stack.go +++ b/src/runtime/stack.go @@ -1254,7 +1254,14 @@ func getStackMap(frame *stkframe, cache *pcvalueCache, debug bool) (locals, args // Arguments. if frame.arglen > 0 { if frame.argmap != nil { + // argmap is set when the function is reflect.makeFuncStub or reflect.methodValueCall. + // In this case, arglen specifies how much of the args section is actually live. + // (It could be either all the args + results, or just the args.) args = *frame.argmap + n := int32(frame.arglen / sys.PtrSize) + if n < args.n { + args.n = n // Don't use more of the arguments than arglen. + } } else { stackmap := (*stackmap)(funcdata(f, _FUNCDATA_ArgsPointerMaps)) if stackmap == nil || stackmap.n <= 0 { |