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192 Commits

Author SHA1 Message Date
Robert Griesemer
7bc03718f4 go spec: clean-up and consolidation of spec with implementation 
Specifically:
- introduced notion of "underlying type"
- removed notion of type compatibility
- consolidated rules about assignment compatibility in
  assignment compatibility section
- be consistent with specyfing that nil is the value
  for uninitialized variables that can be nil (this
  was not specified clearly for pointers, functions, interfaces)
- added/fixed various related links throughout
- clarify language on conversions

R=rsc, r, iant, ken2
CC=golang-dev
https://golang.org/cl/1536041
 2010-06-07 15:49:39 -07:00
Robert Griesemer
1d282a8eb2 go spec: Base comparison compatibility on assignment compatibility. 
Specifically:
- Simplified definition of comparison compatibility and folded into
  section on comparison operators since it's only used there.

This is a small language change/cleanup. As a consequence:
- An interface value may now be compared against a non-interface value.
- Channels with opposite directions cannot be compared directly anymore
  (per discussion with rsc).

R=rsc, r, iant, ken2
CC=golang-dev
https://golang.org/cl/1462041
 2010-06-03 16:55:50 -07:00
Robert Griesemer
63f014910d go spec: change def. of "type compatibility" to be non-recursive 
and adjust conversion rules.

Also:
- clarification of type identity (no language change)
- adjust special rules for channel assignment/comparison to
  require identical element types (in correspondence to non-
  recursiveness of type compatibility)

R=rsc, iant, ken2, r
CC=golang-dev
https://golang.org/cl/1376042
 2010-05-28 14:17:30 -07:00
Robert Griesemer
31f2503cde go spec: Disallow &a notation to obtain a slice 
from an array; one needs to write a[0:] instead.

R=rsc, r, iant, ken2
CC=golang-dev
https://golang.org/cl/1365041
 2010-05-27 17:23:25 -07:00
Evan Shaw
67d30bb696 spec: Fix link to fallthrough statements 
R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/1303041
 2010-05-25 18:24:07 -07:00
Robert Griesemer
c7e03a32b3 go spec: minor fix, to match conversion rules 4 and 5 
R=rsc
CC=golang-dev
https://golang.org/cl/1270042
 2010-05-24 21:25:01 -07:00
Robert Griesemer
934a520d75 go spec: fix and clarify syntax of conversions 
Fixes #803.

R=rsc, r, iant, ken2
CC=golang-dev
https://golang.org/cl/1281041
 2010-05-24 14:58:26 -07:00
Russ Cox
e7561de09a spec: index of non-addressable array is not addressable 
Motivated by:

func f() []int
func g() [10]int

f()[1] = 1  // ok
g()[1] = 1 // ERROR

R=gri
CC=golang-dev
https://golang.org/cl/1278041
 2010-05-24 14:31:43 -07:00
Evan Shaw
cb4e9f8508 spec: Fix a code tag 
R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/1266042
 2010-05-23 11:21:47 -07:00
Robert Griesemer
3af4803704 go spec: added imaginary literal to semicolon rules (was missing) 
- also added links to the respective sections
- reformatted section for better (source html) readability
- added missing closing </li>'s in many places

R=r
CC=golang-dev
https://golang.org/cl/1220041
 2010-05-14 13:11:48 -07:00
Robert Griesemer
56ca697269 go spec: simplify section on channel types 
R=rsc, iant, r
CC=golang-dev
https://golang.org/cl/1171041
 2010-05-07 18:22:40 -07:00
Robert Griesemer
df674ffb43 go spec: clarification of make arguments, 
specification of runtime exceptions for
make and division by zero

R=r, rsc, ken2, iant
CC=golang-dev
https://golang.org/cl/1081041
 2010-05-04 17:31:40 -07:00
Robert Griesemer
39f009cb8e go spec: fix iota description 
R=r, rsc
CC=golang-dev
https://golang.org/cl/946046
 2010-04-29 10:57:27 -07:00
Rob Pike
de92199648 spec: clarify "continue" with label. the text was obvious in intent but 
inaccurate in meaning.

R=gri
CC=golang-dev
https://golang.org/cl/964045
 2010-04-28 13:18:40 -07:00
Robert Griesemer
f5b3c14f31 go spec: fix wrong comment 
Fixes #743.

R=r, rsc
CC=golang-dev
https://golang.org/cl/944044
 2010-04-27 17:52:44 -07:00
Evan Shaw
21110c799d spec: Fix run-time panic header id 
Everything was linking to "Run_time_panics", but the id was "Run_time_errors".

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/961042
 2010-04-22 10:14:53 -07:00
Russ Cox
6aad41919b go_spec updates 
R=r, iant
CC=golang-dev
https://golang.org/cl/921041
 2010-04-13 20:55:57 -07:00
Joe Poirier
d37e87c1b2 gp_spec typo fix: code example in the "Handling panics" section 
R=rsc, adg
CC=golang-dev
https://golang.org/cl/881047
 2010-04-08 10:25:57 +10:00
Robert Griesemer
d4a1619733 go spec: correct clarification of type declaration 
R=rsc, r
CC=golang-dev
https://golang.org/cl/855043
 2010-04-01 12:48:34 -07:00
Robert Griesemer
735e00d4a0 go spec: clarification of type declarations 
R=r, rsc
CC=golang-dev
https://golang.org/cl/849044
 2010-03-31 16:37:22 -07:00
Robert Griesemer
e8e4987ba3 godoc: support for title and subtitle headers when serving .html docs 
and use it to show version (date) of go spec

Fixes #68.

R=rsc
CC=golang-dev, r
https://golang.org/cl/848042
 2010-03-30 17:37:42 -07:00
Andrew Gerrand
10b77f7a2b spec: typo in switch sample code, missing semicolon 
Fixes #697

R=r
CC=golang-dev
https://golang.org/cl/804042
 2010-03-29 13:12:08 +11:00
Russ Cox
97d0e8fe6c gc: allow taking address of out parameters 
Fixes #186.

R=ken2
CC=golang-dev
https://golang.org/cl/793041
 2010-03-26 18:01:02 -07:00
Rob Pike
5bb29fb116 spec changes for panic and recover. 
R=rsc, gri
CC=golang-dev
https://golang.org/cl/763041
 2010-03-25 17:59:59 -07:00
Rob Pike
bf9b8f2c17 Delete panicln from the spec. 
R=rsc, gri, iant, ken2
CC=golang-dev
https://golang.org/cl/738041
 2010-03-24 15:17:00 -07:00
Robert Griesemer
48f0cd2bd5 go spec: modification of defer statement 
R=r, rsc, ken2, iant
CC=golang-dev
https://golang.org/cl/708041
 2010-03-23 17:30:14 -07:00
Robert Griesemer
29f1ca528b Go spec: map indexing never raises a runtime exception. 
Also: Actual map key must be assignment-compatible with
formal map key type.

Fixes #357.

R=r, iant, rsc, ken2
CC=golang-dev
https://golang.org/cl/673042
 2010-03-23 14:01:51 -07:00
Ian Lance Taylor
11a218444f Revert previous change: complexN only converts to complexN. 
This was discussed with Ken and Russ.  6g has been changed,
and both compilers now work this way.  This avoids a double
type conversion--first to the float type, then to the complex
type.

R=r
CC=golang-dev, ken2, rsc
https://golang.org/cl/419042
 2010-03-10 20:38:38 -08:00
Robert Griesemer
ef4c2b85a0 go_spec.html: fix typo and link 
R=r
CC=golang-dev
https://golang.org/cl/382045
 2010-03-10 15:29:36 -08:00
Ian Lance Taylor
18187e7d49 Complex values may only be compared for equality or inequality. 
R=gri, r
CC=golang-dev
https://golang.org/cl/294042
 2010-03-08 14:05:46 -08:00
Ian Lance Taylor
5cf707b499 Clarify that conversions to complex are OK. 
R=r
CC=golang-dev
https://golang.org/cl/296042
 2010-03-08 13:45:03 -08:00
Rob Pike
7297087101 Spec for complex numbers 
R=rsc, ken2, gri, iant
CC=cw, golang-dev
https://golang.org/cl/227041
 2010-03-04 12:35:16 -08:00
Robert Griesemer
f42e8833b3 language spec: make NUL byte rule an implementation restriction 
R=rsc, r, iant, ken2
CC=golang-dev
https://golang.org/cl/211041
 2010-02-17 15:50:34 -08:00
Russ Cox
b7d9ffeecd spec: disallow NUL in source files 
R=r
CC=golang-dev
https://golang.org/cl/209042
 2010-02-16 16:47:18 -08:00
Rob Pike
1811fac7cb specification of []int(string) and []byte(string). 
also clarify other string conversions.

R=rsc, iant, gri, ken2
CC=golang-dev
https://golang.org/cl/207103
 2010-02-17 11:26:09 +11:00
Rob Pike
810def8484 ...T is now implemented 
R=rsc, gri
CC=golang-dev
https://golang.org/cl/198050
 2010-02-01 18:59:23 -08:00
Rob Pike
22a4952bd2 note that ...T is not yet implemented. 
R=rsc
CC=golang-dev
https://golang.org/cl/194114
 2010-01-27 13:45:16 -08:00
Rob Pike
b81065d07f add definition of new parameter style 
... T
for trailing arguments of type T.

R=rsc, gri, ken2, iant
CC=golang-dev
https://golang.org/cl/194100
 2010-01-27 13:14:40 -08:00
Robert Griesemer
1c369bd55f Clarify parsing of channel types. 
R=r, rsc
CC=golang-dev
https://golang.org/cl/194091
 2010-01-27 09:35:39 -08:00
Russ Cox
46871692c2 spec: allow func() func(). 
no longer ambiguous at top level, thanks to new semicolon rules.

use gofmt layout for function types.

Fixes #528.

R=gri
CC=golang-dev
https://golang.org/cl/194077
 2010-01-26 10:25:56 -08:00
Rob Pike
3909b6b479 log.Fatal does not exist. Use log.Crash. 
R=rsc
CC=golang-dev
https://golang.org/cl/193075
 2010-01-25 07:48:31 +11:00
Russ Cox
16205a3534 spec: mention Inf and NaN are supported at run time. 
add hyperlink at mention of package reflect.

Fixes #438.

R=r
CC=golang-dev
https://golang.org/cl/190042
 2010-01-18 15:59:14 -08:00
Ian Lance Taylor
ae13f43810 Clarify when expressions are evaluated for a range clause. 
R=gri, rsc
CC=golang-dev
https://golang.org/cl/189057
 2010-01-13 12:50:45 -08:00
Rob Pike
632a98592d fix typo found by kevin ballard 
R=gri
CC=golang-dev
https://golang.org/cl/186113
 2010-01-13 12:06:33 +11:00
Rob Pike
7ec0856f01 fix typo 
R=gri, iant
CC=golang-dev
https://golang.org/cl/183160
 2010-01-09 07:32:26 +11:00
Robert Griesemer
30e5ed249d remove reference to "basic literal" since it's never defined 
R=rsc, r
CC=golang-dev
https://golang.org/cl/183113
 2010-01-04 17:28:02 -08:00
Robert Griesemer
eb109a765d Clarify section on tokens. 
Fixes #457.

R=r
CC=golang-dev
https://golang.org/cl/181083
 2009-12-28 14:40:42 -08:00
Russ Cox
c1045db1d8 go_spec: use PrimaryExpr as type switch expression 
Without this change, the spec parses <-c.(type) as (<-c).(type)
but parses <-c.(int) as <-(c.(int)).

With this change, the former parses as <-(c.(type)).

All three parsers already implement this rule, because
they look for the "type" word during parsing of a standard
type assertion.  This change merely brings the
spec in line with the implementations.

http://code.google.com/p/go/source/browse/src/cmd/gc/go.y#801
http://code.google.com/p/go/source/browse/src/pkg/go/parser/parser.go#900
http://gcc.gnu.org/viewcvs/branches/gccgo/gcc/go/parse.cc?revision=155389&view=markup#l2469

Pointed out by Brett Kail on golang-nuts.

R=gri
CC=golang-dev
https://golang.org/cl/182044
 2009-12-23 13:48:44 -08:00
Robert Griesemer
130ac74010 Spec modified to reflect new semicolon rules. 
R=rsc, r, iant, ken2
CC=golang-dev
https://golang.org/cl/166066
 2009-12-10 16:43:01 -08:00
Russ Cox
2a5f0c67ca spec: document that built-ins cannot be used as func values 
R=gri
CC=golang-dev
https://golang.org/cl/164088
 2009-12-04 10:23:12 -08:00