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Adding back support for printing operands symbolically to ARM's new disassembler

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using llvm's public 'C' disassembler API now including annotations.

Hooked this up to Darwin's otool(1) so it can again print things like branch
targets for example this:
 blx _puts
instead of this:
 blx #-36
and includes support for annotations for branches to symbol stubs like:
 bl	0x40 @ symbol stub for: _puts
and annotations for pc relative loads like this:
 ldr	r3, #8 @ literal pool for: Hello, world!
Also again can print the expression encoded in the Mach-O relocation entries for
things like this:
 movt r0, :upper16:((_foo-_bar)+1234)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141129 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kevin Enderby
2011-10-04 22:44:48 +00:00
parent a8512edb6d
commit 9e5887b17e
8 changed files with 272 additions and 12 deletions
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13
lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
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@@ -207,7 +207,18 @@ void ARMInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
O << '#' << Op.getImm();
} else {
assert(Op.isExpr() && "unknown operand kind in printOperand");
O << *Op.getExpr();
// If a symbolic branch target was added as a constant expression then print
// that address in hex.
const MCConstantExpr *BranchTarget = dyn_cast<MCConstantExpr>(Op.getExpr());
int64_t Address;
if (BranchTarget && BranchTarget->EvaluateAsAbsolute(Address)) {
O << "0x";
O.write_hex(Address);
}
else {
// Otherwise, just print the expression.
O << *Op.getExpr();
}
}
}