diff options
Diffstat (limited to 'Tools')
| -rw-r--r-- | Tools/compiler/compiler/pyassem.py | 31 |
1 files changed, 14 insertions, 17 deletions
diff --git a/Tools/compiler/compiler/pyassem.py b/Tools/compiler/compiler/pyassem.py index e8810ae..0684623 100644 --- a/Tools/compiler/compiler/pyassem.py +++ b/Tools/compiler/compiler/pyassem.py @@ -613,16 +613,16 @@ def twobyte(val): class LineAddrTable: """lnotab - This class builds the lnotab, which is undocumented but described - by com_set_lineno in compile.c. Here's an attempt at explanation: + This class builds the lnotab, which is documented in compile.c. + Here's a brief recap: For each SET_LINENO instruction after the first one, two bytes are added to lnotab. (In some cases, multiple two-byte entries are added.) The first byte is the distance in bytes between the instruction for the last SET_LINENO and the current SET_LINENO. The second byte is offset in line numbers. If either offset is - greater than 255, multiple two-byte entries are added -- one entry - for each factor of 255. + greater than 255, multiple two-byte entries are added -- see + compile.c for the delicate details. """ def __init__(self): @@ -657,19 +657,16 @@ class LineAddrTable: # compiler because it only generates a SET_LINENO instruction # for the assignment. if line > 0: - while addr > 0 or line > 0: - # write the values in 1-byte chunks that sum - # to desired value - trunc_addr = addr - trunc_line = line - if trunc_addr > 255: - trunc_addr = 255 - if trunc_line > 255: - trunc_line = 255 - self.lnotab.append(trunc_addr) - self.lnotab.append(trunc_line) - addr = addr - trunc_addr - line = line - trunc_line + push = self.lnotab.append + while addr > 255: + push(255); push(0) + addr -= 255 + while line > 255: + push(addr); push(255) + line -= 255 + addr = 0 + if addr > 0 or line > 0: + push(addr); push(line) self.lastline = lineno self.lastoff = self.codeOffset |