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cgo: support more macros #4607

Merged
merged 2 commits into from
Nov 18, 2024
Merged

cgo: support more macros #4607

merged 2 commits into from
Nov 18, 2024

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aykevl
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@aykevl aykevl commented Nov 16, 2024

This PR adds better support for C macros (#define) in CGo.

  1. It makes sure that if a macro contains another macro (such as #define foo (bar+1)) the referenced macro is also defined on the Go side, to avoid errors (undefined: C.something).
  2. It supports function-like macros inside macros. For example, #define add(a, b) (a+b) that can be used like #define added add(3, 5).

Both of these will be necessary to fully support CGo errno values with wasi-libc.

I extracted these two from #4585 because these seem like relatively simple changes, to make the other PR smaller.

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github-actions bot commented Nov 16, 2024

Size difference with the dev branch:

Binary size difference
 flash                          ram
 before   after   diff          before   after   diff
  16864   16864      0   0.00%    4324    4324      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
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  11800   11800      0   0.00%    6580    6580      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/apds9960/proximity/main.go
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  10868   10868      0   0.00%    3340    3340      0   0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/touch/capacitive
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  65816   65816      0   0.00%    4784    4784      0   0.00% tinygo build -size short -o ./build/test.uf2 -target=pico ./examples/mcp9808/main.go
  85924   85924      0   0.00%    5140    5140      0   0.00% tinygo build -size short -o ./build/test.hex -target=challenger-rp2040 ./examples/net/ntpclient/
 296644  296644      0   0.00%   13788   13788      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal -stack-size 8kb ./examples/net/http-get/
 119376  119376      0   0.00%    7848    7848      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 -stack-size 8kb ./examples/net/tcpclient/
 245516  245516      0   0.00%   10488   10488      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
 103112  103112      0   0.00%    9816    9816      0   0.00% tinygo build -size short -o ./build/test.hex -target=metro-m4-airlift -stack-size 8kb ./examples/net/socket/
 338452  338452      0   0.00%   15396   15396      0   0.00% tinygo build -size short -o ./build/test.hex -target=matrixportal-m4 -stack-size 8kb ./examples/net/webstatic/
 111588  111588      0   0.00%    7772    7772      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-mkrwifi1010 -stack-size 8kb ./examples/net/tlsclient/
 154216  154216      0   0.00%    6540    6540      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
 117048  117048      0   0.00%   13132   13132      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webclient/
 286136  286136      0   0.00%   17812   17812      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webserver/
 287132  287132      0   0.00%   18212   18212      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/
5332918 5332918      0   0.00%  811790  811790      0   0.00%

// on to a new invocation of parseConst.
if t.peekToken == token.LPAREN {
if cursor, ok := t.f.names[t.curValue]; ok && t.f.isFunctionLikeMacro(cursor) {
t.Next()

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Next() called twice - is it intentional? If so, would be good to have a comment here

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Yes this is intentional. There is the "cur" (current) token and the "peek" (next) token. At this point we know the current token and the peek token, and we want to skip ahead so that the "current" token is the first unknown token. Hence two Next() calls.

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Added a comment that should hopefully clarify this.

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Thanks, makes sense 👌

This is needed for code like this:

    #define __WASI_ERRNO_INVAL (UINT16_C(28))
    #define EINVAL __WASI_ERRNO_INVAL
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Thanks for the addition @aykevl and to @b0ch3nski for review. Now merging.

@deadprogram deadprogram merged commit e12da15 into dev Nov 18, 2024
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@deadprogram deadprogram deleted the cgo-macro-features branch November 18, 2024 17:35
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3 participants