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cranelift: Deduplicate match_imm functions

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Transforming this into a generic function is proving to be a challenge
since most of the necessary methods are not in a trait. We also need to
cast between the signed and unsigned types, which is difficult to do
in a generic function.

This can be solved for example by adding the num crate as a dependency.
But adding a dependency just to solve this issue seems a bit much.
This commit is contained in:
Afonso Bordado
2021-09-19 15:00:41 +01:00
parent eae1b2d246
commit 3a4ebd7727
1 changed files with 50 additions and 157 deletions
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207
cranelift/reader/src/parser.rs
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@@ -31,6 +31,51 @@ use std::str::FromStr;
use std::{u16, u32};
use target_lexicon::Triple;
macro_rules! match_imm {
($signed:ty, $unsigned:ty, $parser:expr, $err_msg:expr) => {{
if let Some(Token::Integer(text)) = $parser.token() {
$parser.consume();
let negative = text.starts_with('-');
let positive = text.starts_with('+');
let text = if negative || positive {
// Strip sign prefix.
&text[1..]
} else {
text
};
// Parse the text value; the lexer gives us raw text that looks like an integer.
let value = if text.starts_with("0x") {
// Skip underscores.
let text = text.replace("_", "");
// Parse it in hexadecimal form.
<$unsigned>::from_str_radix(&text[2..], 16).map_err(|_| {
$parser.error("unable to parse value as a hexadecimal immediate")
})?
} else {
// Parse it as a signed type to check for overflow and other issues.
text.parse()
.map_err(|_| $parser.error("expected decimal immediate"))?
};
// Apply sign if necessary.
let signed = if negative {
let value = value.wrapping_neg() as $signed;
if value > 0 {
return Err($parser.error("negative number too small"));
}
value
} else {
value as $signed
};
Ok(signed)
} else {
err!($parser.loc, $err_msg)
}
}};
}
/// After some quick benchmarks a program should never have more than 100,000 blocks.
const MAX_BLOCKS_IN_A_FUNCTION: u32 = 100_000;
@@ -793,175 +838,23 @@ impl<'a> Parser<'a> {
// Match and consume an i8 immediate.
fn match_imm8(&mut self, err_msg: &str) -> ParseResult<i8> {
if let Some(Token::Integer(text)) = self.token() {
self.consume();
let negative = text.starts_with('-');
let positive = text.starts_with('+');
let text = if negative || positive {
// Strip sign prefix.
&text[1..]
} else {
text
};
// Parse the text value; the lexer gives us raw text that looks like an integer.
let value = if text.starts_with("0x") {
// Skip underscores.
let text = text.replace("_", "");
// Parse it as a i8 in hexadecimal form.
u8::from_str_radix(&text[2..], 16)
.map_err(|_| self.error("unable to parse i8 as a hexadecimal immediate"))?
} else {
// Parse it as a i8 to check for overflow and other issues.
text.parse()
.map_err(|_| self.error("expected i8 decimal immediate"))?
};
// Apply sign if necessary.
let signed = if negative {
let value = value.wrapping_neg() as i8;
if value > 0 {
return Err(self.error("negative number too small"));
}
value
} else {
value as i8
};
Ok(signed)
} else {
err!(self.loc, err_msg)
}
match_imm!(i8, u8, self, err_msg)
}
// Match and consume a signed 16-bit immediate.
fn match_imm16(&mut self, err_msg: &str) -> ParseResult<i16> {
if let Some(Token::Integer(text)) = self.token() {
self.consume();
let negative = text.starts_with('-');
let positive = text.starts_with('+');
let text = if negative || positive {
// Strip sign prefix.
&text[1..]
} else {
text
};
// Parse the text value; the lexer gives us raw text that looks like an integer.
let value = if text.starts_with("0x") {
// Skip underscores.
let text = text.replace("_", "");
// Parse it as a i16 in hexadecimal form.
u16::from_str_radix(&text[2..], 16)
.map_err(|_| self.error("unable to parse i16 as a hexadecimal immediate"))?
} else {
// Parse it as a i16 to check for overflow and other issues.
text.parse()
.map_err(|_| self.error("expected i16 decimal immediate"))?
};
// Apply sign if necessary.
let signed = if negative {
let value = value.wrapping_neg() as i16;
if value > 0 {
return Err(self.error("negative number too small"));
}
value
} else {
value as i16
};
Ok(signed)
} else {
err!(self.loc, err_msg)
}
match_imm!(i16, u16, self, err_msg)
}
// Match and consume an i32 immediate.
// This is used for stack argument byte offsets.
fn match_imm32(&mut self, err_msg: &str) -> ParseResult<i32> {
if let Some(Token::Integer(text)) = self.token() {
self.consume();
let negative = text.starts_with('-');
let positive = text.starts_with('+');
let text = if negative || positive {
// Strip sign prefix.
&text[1..]
} else {
text
};
// Parse the text value; the lexer gives us raw text that looks like an integer.
let value = if text.starts_with("0x") {
// Skip underscores.
let text = text.replace("_", "");
// Parse it as a i32 in hexadecimal form.
u32::from_str_radix(&text[2..], 16)
.map_err(|_| self.error("unable to parse i32 as a hexadecimal immediate"))?
} else {
// Parse it as a i32 to check for overflow and other issues.
text.parse()
.map_err(|_| self.error("expected i32 decimal immediate"))?
};
// Apply sign if necessary.
let signed = if negative {
let value = value.wrapping_neg() as i32;
if value > 0 {
return Err(self.error("negative number too small"));
}
value
} else {
value as i32
};
Ok(signed)
} else {
err!(self.loc, err_msg)
}
match_imm!(i32, u32, self, err_msg)
}
// Match and consume an i128 immediate.
fn match_imm128(&mut self, err_msg: &str) -> ParseResult<i128> {
if let Some(Token::Integer(text)) = self.token() {
self.consume();
let negative = text.starts_with('-');
let positive = text.starts_with('+');
let text = if negative || positive {
// Strip sign prefix.
&text[1..]
} else {
text
};
// Parse the text value; the lexer gives us raw text that looks like an integer.
let value = if text.starts_with("0x") {
// Skip underscores.
let text = text.replace("_", "");
// Parse it as a i128 in hexadecimal form.
u128::from_str_radix(&text[2..], 16)
.map_err(|_| self.error("unable to parse i128 as a hexadecimal immediate"))?
} else {
// Parse it as a i128 to check for overflow and other issues.
text.parse()
.map_err(|_| self.error("expected i128 decimal immediate"))?
};
// Apply sign if necessary.
let signed = if negative {
let value = value.wrapping_neg() as i128;
if value > 0 {
return Err(self.error("negative number too small"));
}
value
} else {
value as i128
};
Ok(signed)
} else {
err!(self.loc, err_msg)
}
match_imm!(i128, u128, self, err_msg)
}
// Match and consume an optional offset32 immediate.
@@ -2848,7 +2741,7 @@ impl<'a> Parser<'a> {
I16 => DataValue::from(self.match_imm16("expected an i16")?),
I32 => DataValue::from(self.match_imm32("expected an i32")?),
I64 => DataValue::from(Into::<i64>::into(self.match_imm64("expected an i64")?)),
I128 => DataValue::from(self.match_imm128("expected an i64")?),
I128 => DataValue::from(self.match_imm128("expected an i128")?),
F32 => DataValue::from(self.match_ieee32("expected an f32")?),
F64 => DataValue::from(self.match_ieee64("expected an f64")?),
_ if ty.is_vector() => {