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Implement jump tables (#453)

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* Add 'jump_table_entry' and 'indirect_jump' instructions.

* Update CodeSink to keep track of code size. Pretty up clif-util's disassembly output.

* Only disassemble the machine portion of output. Pretty print the read-only data after it.

* Update switch frontend code to use new br_table instruction w/ default.
This commit is contained in:
Tyler McMullen
2018-10-03 11:04:21 -06:00
committed by Dan Gohman
parent de1d82b4ba
commit 79cea5e18b
39 changed files with 627 additions and 100 deletions
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37
lib/reader/src/parser.rs
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@@ -2225,9 +2225,44 @@ impl<'a> Parser<'a> {
InstructionFormat::BranchTable => {
let arg = self.match_value("expected SSA value operand")?;
self.match_token(Token::Comma, "expected ',' between operands")?;
let ebb_num = self.match_ebb("expected branch destination EBB")?;
self.match_token(Token::Comma, "expected ',' between operands")?;
let table = self.match_jt()?;
ctx.check_jt(table, self.loc)?;
InstructionData::BranchTable { opcode, arg, table }
InstructionData::BranchTable {
opcode,
arg,
destination: ebb_num,
table,
}
}
InstructionFormat::BranchTableBase => {
let table = self.match_jt()?;
ctx.check_jt(table, self.loc)?;
InstructionData::BranchTableBase { opcode, table }
}
InstructionFormat::BranchTableEntry => {
let index = self.match_value("expected SSA value operand")?;
self.match_token(Token::Comma, "expected ',' between operands")?;
let base = self.match_value("expected SSA value operand")?;
self.match_token(Token::Comma, "expected ',' between operands")?;
let imm = self.match_uimm8("expected width")?;
self.match_token(Token::Comma, "expected ',' between operands")?;
let table = self.match_jt()?;
ctx.check_jt(table, self.loc)?;
InstructionData::BranchTableEntry {
opcode,
args: [index, base],
imm,
table,
}
}
InstructionFormat::IndirectJump => {
let arg = self.match_value("expected SSA value operand")?;
self.match_token(Token::Comma, "expected ',' between operands")?;
let table = self.match_jt()?;
ctx.check_jt(table, self.loc)?;
InstructionData::IndirectJump { opcode, arg, table }
}
InstructionFormat::InsertLane => {
let lhs = self.match_value("expected SSA value first operand")?;