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stacksize: deal with DW_CFA_advance_loc1

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In some cases this operation is emitted. It appears to be emitted when a
switch is lowered to a jump table in the ARM backend.
This commit is contained in:
Ayke van Laethem
2020-09-16 01:07:46 +02:00
committed by Ron Evans
parent 4dadb31e18
commit fcedf0beaa
1 changed files with 10 additions and 0 deletions
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stacksize/dwarf.go
+10
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@@ -207,6 +207,16 @@ func (fi *frameInfo) exec(bytecode []byte) ([]frameInfoLine, error) {
switch lowBits { switch lowBits {
case 0: // DW_CFA_nop case 0: // DW_CFA_nop
// no operation // no operation
case 0x02: // DW_CFA_advance_loc1
// Very similar to DW_CFA_advance_loc but allows for a slightly
// larger range.
offset, err := r.ReadByte()
if err != nil {
return nil, err
}
fi.loc += uint64(offset) * fi.cie.codeAlignmentFactor
entries = append(entries, fi.newLine())
// TODO: DW_CFA_advance_loc2 etc
case 0x07: // DW_CFA_undefined case 0x07: // DW_CFA_undefined
// Marks a single register as undefined. This is used to stop // Marks a single register as undefined. This is used to stop
// unwinding in tinygo_startTask using: // unwinding in tinygo_startTask using: