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| author | Ayke van Laethem <[email protected]> | 2020-09-16 01:07:46 +0200 |
|---|---|---|
| committer | Ron Evans <[email protected]> | 2020-09-16 05:06:34 +0200 |
| commit | fcedf0beaa44c080e583c4b7eb6932f8ea4117e0 (patch) | |
| tree | 80cff78ea511030f190e6eb98da908a8e1150b41 /stacksize | |
| parent | 4dadb31e18ffbd74b86ef0e775ec378bb2c2161f (diff) | |
| download | tinygo-fcedf0beaa44c080e583c4b7eb6932f8ea4117e0.tar.gz tinygo-fcedf0beaa44c080e583c4b7eb6932f8ea4117e0.zip | |
stacksize: deal with DW_CFA_advance_loc1
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.
Diffstat (limited to 'stacksize')
| -rw-r--r-- | stacksize/dwarf.go | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/stacksize/dwarf.go b/stacksize/dwarf.go index 6186a8c2f..d4e714277 100644 --- a/stacksize/dwarf.go +++ b/stacksize/dwarf.go @@ -207,6 +207,16 @@ func (fi *frameInfo) exec(bytecode []byte) ([]frameInfoLine, error) { switch lowBits { case 0: // DW_CFA_nop // 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 // Marks a single register as undefined. This is used to stop // unwinding in tinygo_startTask using: |