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cgo: support preprocessor macros passed on the command line

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Go code might sometimes want to use preprocessor macros that were passed
on the command line. This wasn't working before and resulted in the
following error:

    internal error: could not find file where macro is defined

This is now supported, though location information isn't available
(which makes sense: the command line is not a file).

I had to use the `clang_tokenize` API for this and reconstruct the
original source location. Apparently this is the only way to do it:
https://stackoverflow.com/a/19074846/559350
In the future we could consider replacing our own tokenization with the
tokenizer that's built into Clang directly. This should reduce the
possibility of bugs a bit.
This commit is contained in:
Ayke van Laethem
2024-07-12 19:15:32 +02:00
committed by Ayke
parent 6f462fba4c
commit 2f3d821b13
5 changed files with 72 additions and 37 deletions
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cgo/testdata/errors.out.go
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+9 -2
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@@ -1,9 +1,12 @@
// CGo errors:
// testdata/errors.go:4:2: warning: some warning
// testdata/errors.go:11:9: error: unknown type name 'someType'
// testdata/errors.go:22:5: warning: another warning
// testdata/errors.go:26:5: warning: another warning
// testdata/errors.go:13:23: unexpected token ), expected end of expression
// testdata/errors.go:19:26: unexpected token ), expected end of expression
// testdata/errors.go:21:26: unexpected token ), expected end of expression
// testdata/errors.go:16:33: unexpected token ), expected end of expression
// testdata/errors.go:17:34: unexpected token ), expected end of expression
// -: unexpected token INT, expected end of expression
// Type checking errors after CGo processing:
// testdata/errors.go:102: cannot use 2 << 10 (untyped int constant 2048) as C.char value in variable declaration (overflows)
@@ -11,6 +14,9 @@
// testdata/errors.go:108: undefined: C.SOME_CONST_1
// testdata/errors.go:110: cannot use C.SOME_CONST_3 (untyped int constant 1234) as byte value in variable declaration (overflows)
// testdata/errors.go:112: undefined: C.SOME_CONST_4
// testdata/errors.go:114: undefined: C.SOME_CONST_b
// testdata/errors.go:116: undefined: C.SOME_CONST_startspace
// testdata/errors.go:119: undefined: C.SOME_PARAM_CONST_invalid
package main
@@ -58,3 +64,4 @@ type C.struct_point_t struct {
type C.point_t = C.struct_point_t
const C.SOME_CONST_3 = 1234
const C.SOME_PARAM_CONST_valid = 3 + 4