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compiler: check for floating-point exponent overflow

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Adjust mksysinfo and mkrsysinfo to strip out floating-point max numbers,
as they can trigger this error.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/278476
This commit is contained in:
Ian Lance Taylor 2020-12-15 21:52:23 -08:00
parent 0e9f2b2dc8
commit 5128f8d0d9
6 changed files with 22 additions and 12 deletions
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2
gcc/go/gofrontend/MERGE
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@ -1,4 +1,4 @@
526037336231593939a517b7c0b2892d413adb40
1317de50147304a226b3ec5c4d81376470c358e5
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.

4
gcc/go/gofrontend/lex.cc
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@ -1316,9 +1316,13 @@ Lex::gather_number()
}
}
mpfr_clear_overflow();
mpfr_t val;
int r = mpfr_init_set_str(val, num.c_str(), base, MPFR_RNDN);
go_assert(r == 0);
if (mpfr_overflow_p())
go_error_at(this->location(),
"floating-point exponent too large to represent");
bool is_imaginary = *p == 'i';
if (is_imaginary)

4
gcc/testsuite/go.test/test/fixedbugs/issue11326b.go
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@ -1,5 +1,9 @@
// run
// Does not work with gccgo, which uses a smaller (but still permitted)
// exponent size.
// +build !gccgo
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

22
gcc/testsuite/go.test/test/fixedbugs/issue13471.go
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@ -9,17 +9,17 @@
package main
func main() {
const _ int64 = 1e646456992 // ERROR "integer too large|floating-point constant truncated to integer"
const _ int32 = 1e64645699 // ERROR "integer too large|floating-point constant truncated to integer"
const _ int16 = 1e6464569 // ERROR "integer too large|floating-point constant truncated to integer"
const _ int8 = 1e646456 // ERROR "integer too large|floating-point constant truncated to integer"
const _ int = 1e64645 // ERROR "integer too large|floating-point constant truncated to integer"
const _ int64 = 1e646456992 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
const _ int32 = 1e64645699 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
const _ int16 = 1e6464569 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
const _ int8 = 1e646456 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
const _ int = 1e64645 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
const _ uint64 = 1e646456992 // ERROR "integer too large|floating-point constant truncated to integer"
const _ uint32 = 1e64645699 // ERROR "integer too large|floating-point constant truncated to integer"
const _ uint16 = 1e6464569 // ERROR "integer too large|floating-point constant truncated to integer"
const _ uint8 = 1e646456 // ERROR "integer too large|floating-point constant truncated to integer"
const _ uint = 1e64645 // ERROR "integer too large|floating-point constant truncated to integer"
const _ uint64 = 1e646456992 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
const _ uint32 = 1e64645699 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
const _ uint16 = 1e6464569 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
const _ uint8 = 1e646456 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
const _ uint = 1e64645 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
const _ rune = 1e64645 // ERROR "integer too large|floating-point constant truncated to integer"
const _ rune = 1e64645 // ERROR "integer too large|floating-point constant truncated to integer|exponent too large"
}

1
libgo/mkrsysinfo.sh
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@ -26,6 +26,7 @@ grep -v '^// ' gen-sysinfo.go | \
grep -v '^type _*locale[_ ]' | \
grep -v 'in6_addr' | \
grep -v 'sockaddr_in6' | \
egrep -v '^const _*FLT(64|128)_(NORM_)?MAX' | \
sed -e 's/\([^a-zA-Z0-9_]\)_timeval\([^a-zA-Z0-9_]\)/\1timeval\2/g' \
-e 's/\([^a-zA-Z0-9_]\)_timespec_t\([^a-zA-Z0-9_]\)/\1timespec\2/g' \
-e 's/\([^a-zA-Z0-9_]\)_timespec\([^a-zA-Z0-9_]\)/\1timespec\2/g' \

1
libgo/mksysinfo.sh
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@ -38,6 +38,7 @@ grep -v '^// ' gen-sysinfo.go | \
grep -v '^type _*locale[_ ]' | \
grep -v 'in6_addr' | \
grep -v 'sockaddr_in6' | \
egrep -v '^const _*FLT(64|128)_(NORM_)?MAX' | \
sed -e 's/\([^a-zA-Z0-9_]\)_timeval\([^a-zA-Z0-9_]\)/\1Timeval\2/g' \
-e 's/\([^a-zA-Z0-9_]\)_timespec_t\([^a-zA-Z0-9_]\)/\1Timespec\2/g' \
-e 's/\([^a-zA-Z0-9_]\)_timespec\([^a-zA-Z0-9_]\)/\1Timespec\2/g' \