Calling .Interface on a struct field's reflect.Value isn't always safe.
For example, if that field is an unexported anonymous struct.
We only descended into this branch if the struct type had any methods,
so this bug had gone unnoticed for a few release cycles.
Add the check, and add a simple test case.
Fixes#28145.
Change-Id: I02f7e0ab9a4a0c18a5e2164211922fe9c3d30f64
Reviewed-on: https://go-review.googlesource.com/c/141537
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Given a program as follows:
data := []byte(`{"F": {
"a": 2,
"3": 4
}}`)
json.Unmarshal(data, &map[string]map[int]int{})
The JSON package should error, as "a" is not a valid integer. However,
we'd encounter a panic:
panic: JSON decoder out of sync - data changing underfoot?
The reason was that decodeState.object would return a nil error on
encountering the invalid map key string, while saving the key type error
for later. This broke if we were inside another object, as we would
abruptly end parsing the nested object, leaving the decoder in an
unexpected state.
To fix this, simply avoid storing the map element and continue decoding
the object, to leave the decoder state exactly as if we hadn't seen an
invalid key type.
This affected both signed and unsigned integer keys, so fix both and add
two test cases.
Updates #28189.
Change-Id: I8a6204cc3ff9fb04ed769df7a20a824c8b94faff
Reviewed-on: https://go-review.googlesource.com/c/142518
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Having these panic-like errors used to be ok, since they were used in
the internal decoder state instead of passed around via return
parameters.
Recently, the decoder was rewritten to use explicit error returns
instead. This error is a terrible fit for error returns; a handful of
functions must return an error because of it, and their callers must
check for an error that should never happen.
This is precisely what panics are for, so use them. The test coverage of
the package goes up from 91.3% to 91.6%, and performance is unaffected.
We can also get rid of some unnecessary verbosity in the code.
name old time/op new time/op delta
CodeDecoder-4 27.5ms ± 1% 27.5ms ± 1% ~ (p=0.937 n=6+6)
Change-Id: I01033b3f5b7c0cf0985082fa272754f96bf6353c
Reviewed-on: https://go-review.googlesource.com/134835
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
The overall coverage of the json package goes up from 90.8% to 91.3%.
While at it, apply two minor code simplifications found while inspecting
the HTML coverage report.
Change-Id: I0fba968afeedc813b1385e4bde72d93b878854d7
Reviewed-on: https://go-review.googlesource.com/134735
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reuse v.Type() and cachedTypeFields(t) when decoding maps and structs.
Always use the same data slices when in hot loops, to ensure that the
compiler generates good code. "for i < len(data) { use(d.data[i]) }"
makes it harder for the compiler.
Finally, do other minor clean-ups, such as deduplicating switch cases,
and using a switch instead of three chained ifs.
The decoder sees a noticeable speed-up, in particular when decoding
structs.
name old time/op new time/op delta
CodeDecoder-4 29.8ms ± 1% 27.5ms ± 0% -7.83% (p=0.002 n=6+6)
name old speed new speed delta
CodeDecoder-4 65.0MB/s ± 1% 70.6MB/s ± 0% +8.49% (p=0.002 n=6+6)
Updates #5683.
Change-Id: I9d751e22502221962da696e48996ffdeb777277d
Reviewed-on: https://go-review.googlesource.com/122468
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Calling Name on a reflect.Type is somewhat expensive, as it involves a
number of nested calls and string handling.
This cost was showing up when decoding structs, as we were calling it to
set up an error context.
We can avoid the extra work unless we do encounter an error, which makes
decoding via struct types faster.
name old time/op new time/op delta
CodeDecoder-4 31.0ms ± 1% 29.9ms ± 1% -3.69% (p=0.002 n=6+6)
name old speed new speed delta
CodeDecoder-4 62.6MB/s ± 1% 65.0MB/s ± 1% +3.83% (p=0.002 n=6+6)
Updates #5683.
Change-Id: I48a3a85ef0ba96f524b7c3e9096cb2c4589e077a
Reviewed-on: https://go-review.googlesource.com/122467
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Each URL was manually verified to ensure it did not serve up incorrect
content.
Change-Id: I4dc846227af95a73ee9a3074d0c379ff0fa955df
Reviewed-on: https://go-review.googlesource.com/115798
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Fixes golint warning about "if block ends with a return statement, so drop this else and outdent its block".
Change-Id: Id17ad0bf37ba939386b177b709e9e3c067d8ba21
Reviewed-on: https://go-review.googlesource.com/105736
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Consider the following:
type child struct{ Field string }
type parent struct{ child }
p := new(parent)
v := reflect.ValueOf(p).Elem().Field(0)
v.Field(0).SetString("hello") // v.Field = "hello"
v = v.Addr().Elem() // v = *(&v)
v.Field(0).SetString("goodbye") // v.Field = "goodbye"
It would appear that v.Addr().Elem() should have the same value, and
that it would be safe to set "goodbye".
However, after CL 66331, any interspersed calls between Field calls
causes the RO flag to be set.
Thus, setting to "goodbye" actually causes a panic.
That CL affects decodeState.indirect which assumes that back-to-back
Value.Addr().Elem() is side-effect free. We fix that logic to keep
track of the Addr() and Elem() calls and set v back to the original
after a full round-trip has occured.
Fixes#24152
Updates #24153
Change-Id: Ie50f8fe963f00cef8515d89d1d5cbc43b76d9f9c
Reviewed-on: https://go-review.googlesource.com/97796
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Rather than only ignoring runtime.Error panics, which are a very
narrow set of possible panic values, switch it such that the json
package only captures panic values that have been properly wrapped
in a jsonError struct. This ensures that only intentional panics
originating from the json package are captured.
Fixes#23012
Change-Id: I5e85200259edd2abb1b0512ce6cc288849151a6d
Reviewed-on: https://go-review.googlesource.com/94019
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This CL reverts CL 76851 and takes a different approach to #21357.
The changes in encode.go and encode_test.go are reverts that
rolls back the changed behavior in CL 76851 where
embedded pointers to unexported struct types were
unilaterally ignored in both marshal and unmarshal.
Instead, these fields are handled as before with the exception that
it returns an error when Unmarshal is unable to set an unexported field.
The behavior of Marshal is now unchanged with regards to #21357.
This policy maintains the greatest degree of backwards compatibility
and avoids silently discarding data the user may have expected to be present.
Fixes#21357
Change-Id: I7dc753280c99f786ac51acf7e6c0246618c8b2b1
Reviewed-on: https://go-review.googlesource.com/82135
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Add a DisallowUnknownFields flag to Decoder.
DisallowUnknownFields causes the Decoder to return an error when
the the decoding destination is a struct and the input contains
object keys which do not match any non-ignored, public field the
destination, including keys whose value is set to null.
Note: this fix has already been worked on in 27231, which seems
to be abandoned. This version is a slightly simpler implementation
and is up to date with the master branch.
Fixes#15314
Change-Id: I987a5857c52018df334f4d1a2360649c44a7175d
Reviewed-on: https://go-review.googlesource.com/74830
Reviewed-by: Joe Tsai <joetsai@google.com>
Run-TryBot: Joe Tsai <joetsai@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
In #10909, it was decided that "Deprecated:" is a magic string for
tools (e.g., #17056 for godoc) to detect deprecated identifiers.
Use those convention instead of custom written prose.
Change-Id: Ia514fc3c88fc502e86c6e3de361c435f4cb80b22
Reviewed-on: https://go-review.googlesource.com/70110
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
Went mainly for the ones that make no sense, such as the ones
mid-sentence or after commas.
Change-Id: Ie245d2c19cc7428a06295635cf6a9482ade25ff0
Reviewed-on: https://go-review.googlesource.com/57293
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
JSON decoding performs poorly for unmapped and ignored fields. We noticed better
performance when unmarshalling unused fields. The loss comes mostly from calls
to scanner.error as described at #17914.
benchmark old ns/op new ns/op delta
BenchmarkIssue10335-8 431 408 -5.34%
BenchmarkUnmapped-8 1744 1314 -24.66%
benchmark old allocs new allocs delta
BenchmarkIssue10335-8 4 3 -25.00%
BenchmarkUnmapped-8 18 4 -77.78%
benchmark old bytes new bytes delta
BenchmarkIssue10335-8 320 312 -2.50%
BenchmarkUnmapped-8 568 344 -39.44%
Fixes#17914, improves #10335
Change-Id: I7d4258a94eb287c0fe49e7334795209b90434cd0
Reviewed-on: https://go-review.googlesource.com/33276
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
1. Define behavior for Unmarshal of JSON null into Unmarshaler and
TextUnmarshaler. Specifically, an Unmarshaler will be given the
literal null and can decide what to do (because otherwise
json.RawMessage is impossible to implement), and a TextUnmarshaler
will be skipped over (because there is no text to unmarshal), like
most other inappropriate types. Document this in Unmarshal, with a
reminder in UnmarshalJSON about handling null.
2. Test all this.
3. Fix the TextUnmarshaler case, which was returning an unmarshalling
error, to match the definition.
4. Fix the error that had been used for the TextUnmarshaler, since it
was claiming that there was a JSON string when in fact the problem was
NOT having a string.
5. Adjust time.Time and big.Int's UnmarshalJSON to ignore null, as is
conventional.
Fixes#9037.
Change-Id: If78350414eb8dda712867dc8f4ca35a9db041b0c
Reviewed-on: https://go-review.googlesource.com/30944
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The UnmarshalTypeError has two new fields Struct and Field,
used when constructing the error message.
Fixes#6716.
Change-Id: I67da171480a9491960b3ae81893770644180f848
Reviewed-on: https://go-review.googlesource.com/18692
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This change makes encoding and decoding support integer types in map
keys, converting to/from JSON string keys.
JSON object keys are still sorted lexically, even though the keys may be
integer strings.
For backwards-compatibility, the existing Text(Un)Marshaler support for
map keys (added in CL 20356) does not take precedence over the default
encoding for string types. There is no such concern for integer types,
so integer map key encoding is only used as a fallback if the map key
type is not a Text(Un)Marshaler.
Fixes#12529.
Change-Id: I7e68c34f9cd19704b1d233a9862da15fabf0908a
Reviewed-on: https://go-review.googlesource.com/22060
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
In JSON terminology, "object" is a collect of key/value pairs. But a
JSON object is only one type of JSON value (others are string, number,
array, true, false, null).
This updates the Go docs (at least the public godoc) to not use
"object" when we mean any JSON value.
Change-Id: Ieb1c456c703693714d63d9d09d306f4d9e8f4597
Reviewed-on: https://go-review.googlesource.com/22003
Reviewed-by: Andrew Gerrand <adg@golang.org>
This CL allows JSON-encoding & -decoding maps whose keys are types that
implement encoding.TextMarshaler / TextUnmarshaler.
During encode, the map keys are marshaled upfront so that they can be
sorted.
Fixes#12146
Change-Id: I43809750a7ad82a3603662f095c7baf75fd172da
Reviewed-on: https://go-review.googlesource.com/20356
Run-TryBot: Caleb Spare <cespare@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The tree's pretty inconsistent about single space vs double space
after a period in documentation. Make it consistently a single space,
per earlier decisions. This means contributors won't be confused by
misleading precedence.
This CL doesn't use go/doc to parse. It only addresses // comments.
It was generated with:
$ perl -i -npe 's,^(\s*// .+[a-z]\.) +([A-Z]),$1 $2,' $(git grep -l -E '^\s*//(.+\.) +([A-Z])')
$ go test go/doc -update
Change-Id: Iccdb99c37c797ef1f804a94b22ba5ee4b500c4f7
Reviewed-on: https://go-review.googlesource.com/20022
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dave Day <djd@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Followup to CL 12250.
For #10281.
Change-Id: If25d9cac92f10327bb355f2d11b00c625b464661
Reviewed-on: https://go-review.googlesource.com/17199
Reviewed-by: Ian Lance Taylor <iant@golang.org>
json.Number is a special case which didn't have any checks and could result in invalid JSON.
Fixes#10281
Change-Id: Ie3e726e4d6bf6a6aba535d36f6107013ceac913a
Reviewed-on: https://go-review.googlesource.com/12250
Reviewed-by: Russ Cox <rsc@golang.org>
This allows slices of custom types with byte as underlying type to be
decoded, fixing a regression introduced in CL 9371.
Fixes#12921.
Change-Id: I62a715eaeaaa912b6bc599e94f9981a9ba5cb242
Reviewed-on: https://go-review.googlesource.com/16303
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The fields step and redoState of struct scanner are now defined as
`func(s *scanner, c byte) int` instead of
`func(s *scanner, c int) int`, since bytes are sufficient.
Further changes improve the consistency in the scanner.go file.
Change-Id: Ifb85f2130d728d2b936d79914d87a1f0b5c6ee7d
Reviewed-on: https://go-review.googlesource.com/14801
Reviewed-by: Andrew Gerrand <adg@golang.org>
Run-TryBot: Andrew Gerrand <adg@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
JSON decoding currently fails for null values bound to any type
which does implement the JSON Unmarshaler interface without checking
for null values (such as time.Time).
It also fails for types implementing the TextUnmarshaler interface.
The expected behavior of the JSON decoding engine in such case is
to process null by keeping the value unchanged without producing
any error.
Make sure null values are handled by the decoding engine itself,
and never passed to the UnmarshalText or UnmarshalJSON methods.
Fixes#9037
Change-Id: I261d85587ba543ef6f1815555b2af9311034d5bb
Reviewed-on: https://go-review.googlesource.com/9376
Reviewed-by: Russ Cox <rsc@golang.org>
All slice types which have elements of kind reflect.Uint8 are marshalled
into base64 for compactness. When decoding such data into a custom type
based on []byte the decoder checked the slice kind instead of the slice
element kind, so no appropriate decoder was found.
Fixed by letting the decoder check slice element kind like the encoder.
This guarantees that already encoded data can still be successfully
decoded.
Fixes#8962.
Change-Id: Ia320d4dc2c6e9e5fe6d8dc15788c81da23d20c4f
Reviewed-on: https://go-review.googlesource.com/9371
Reviewed-by: Peter Waldschmidt <peter@waldschmidt.com>
Reviewed-by: Russ Cox <rsc@golang.org>
The error message for decoding a unquoted value into a struct field with
the ,string option specified has two arguments when one is needed.
Make the error message take one argument and add a test in order to cover
the case when a unquoted value is specified.
Also add error value as the missing argument for Fatalf call in test.
Fixes the following go vet reports:
decode.go:602: wrong number of args for format in Errorf call: 1 needed but 2 args
decode_test.go:1088: missing argument for Fatalf("%v"): format reads arg 1, have only 0 args
Change-Id: Id036e10c54c4a7c1ee9952f6910858ecc2b84134
Reviewed-on: https://go-review.googlesource.com/2109
Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>
