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Pull r53795 from Gaz into mainline:

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If .loc and .file aren't used, always emit the "debug_line" section. This
requires at least one entry in the line matrix. So if there's nothing to emit
into the matrix, emit an end of matrix value anyway.

llvm-svn: 53803
This commit is contained in:
Bill Wendling 2008-07-20 00:11:19 +00:00
parent b49440f266
commit 73f5ecdbea
1 changed files with 29 additions and 14 deletions
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43
lib/CodeGen/DwarfWriter.cpp
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@ -2253,12 +2253,28 @@ private:
}
}
/// EmitEndOfLineMatrix - Emit the last address of the section and the end of
/// the line matrix.
///
void EmitEndOfLineMatrix(unsigned SectionEnd) {
// Define last address of section.
Asm->EmitInt8(0); Asm->EOL("Extended Op");
Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
Asm->EmitInt8(DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
EmitReference("section_end", SectionEnd); Asm->EOL("Section end label");
// Mark end of matrix.
Asm->EmitInt8(0); Asm->EOL("DW_LNE_end_sequence");
Asm->EmitULEB128Bytes(1); Asm->EOL();
Asm->EmitInt8(1); Asm->EOL();
}
/// EmitDebugLines - Emit source line information.
///
void EmitDebugLines() {
// If there are no lines to emit (such as when we're using .loc directives
// to emit .debug_line information) don't emit a .debug_line header.
if (SectionSourceLines.empty())
// If the target is using .loc/.file, the assembler will be emitting the
// .debug_line table automatically.
if (TAI->hasDotLocAndDotFile())
return;
// Minimum line delta, thus ranging from -10..(255-10).
@ -2330,7 +2346,9 @@ private:
EmitLabel("line_prolog_end", 0);
// A sequence for each text section.
for (unsigned j = 0, M = SectionSourceLines.size(); j < M; ++j) {
unsigned SecSrcLinesSize = SectionSourceLines.size();
for (unsigned j = 0; j < SecSrcLinesSize; ++j) {
// Isolate current sections line info.
const std::vector<SourceLineInfo> &LineInfos = SectionSourceLines[j];
@ -2398,17 +2416,14 @@ private:
}
}
// Define last address of section.
Asm->EmitInt8(0); Asm->EOL("Extended Op");
Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
Asm->EmitInt8(DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
EmitReference("section_end", j + 1); Asm->EOL("Section end label");
// Mark end of matrix.
Asm->EmitInt8(0); Asm->EOL("DW_LNE_end_sequence");
Asm->EmitULEB128Bytes(1); Asm->EOL();
Asm->EmitInt8(1); Asm->EOL();
EmitEndOfLineMatrix(j + 1);
}
if (SecSrcLinesSize == 0)
// Because we're emitting a debug_line section, we still need a line
// table. The linker and friends expect it to exist. If there's nothing to
// put into it, emit an empty table.
EmitEndOfLineMatrix(1);
EmitLabel("line_end", 0);