[llvm-readobj] Add -hex-dump (-x) option

Differential Revision: https://reviews.llvm.org/D48281

llvm-svn: 336782

1 files changed, 42 insertions, 0 deletions

diff --git a/llvm/tools/llvm-readobj/ObjDumper.cpp b/llvm/tools/llvm-readobj/ObjDumper.cpp
index 95a6d0325e2..3eb24bdf791 100644
--- a/llvm/tools/llvm-readobj/ObjDumper.cpp
+++ b/llvm/tools/llvm-readobj/ObjDumper.cpp
@@ -25,4 +25,46 @@ ObjDumper::ObjDumper(ScopedPrinter &Writer) : W(Writer) {}
 ObjDumper::~ObjDumper() {
 }
 
+void ObjDumper::SectionHexDump(StringRef SecName, const uint8_t *Section,
+                               size_t Size) {
+  const uint8_t *SecContent = Section;
+  const uint8_t *SecEnd = Section + Size;
+  W.startLine() << "Hex dump of section '" << SecName << "':\n";
+
+  for (const uint8_t *SecPtr = SecContent; SecPtr < SecEnd; SecPtr += 16) {
+    const uint8_t *TmpSecPtr = SecPtr;
+    uint8_t i;
+    uint8_t k;
+
+    W.startLine() << format_hex(SecPtr - SecContent, 10);
+    W.startLine() << ' ';
+    for (i = 0; TmpSecPtr < SecEnd && i < 4; ++i) {
+      for (k = 0; TmpSecPtr < SecEnd && k < 4; k++, TmpSecPtr++) {
+        uint8_t Val = *(reinterpret_cast<const uint8_t *>(TmpSecPtr));
+        W.startLine() << format_hex_no_prefix(Val, 2);
+      }
+      W.startLine() << ' ';
+    }
+
+    // We need to print the correct amount of spaces to match the format.
+    // We are adding the (4 - i) last rows that are 8 characters each.
+    // Then, the (4 - i) spaces that are in between the rows.
+    // Least, if we cut in a middle of a row, we add the remaining characters,
+    // which is (8 - (k * 2))
+    if (i < 4)
+      W.startLine() << format("%*c", (4 - i) * 8 + (4 - i) + (8 - (k * 2)),
+                              ' ');
+
+    TmpSecPtr = SecPtr;
+    for (i = 0; TmpSecPtr + i < SecEnd && i < 16; ++i) {
+      if (isprint(TmpSecPtr[i]))
+        W.startLine() << TmpSecPtr[i];
+      else
+        W.startLine() << '.';
+    }
+
+    W.startLine() << '\n';
+  }
+}
+
 } // namespace llvm